CN103837776A - Experimental system for voltage stability testing of AC/DC parallel power network - Google Patents
Experimental system for voltage stability testing of AC/DC parallel power network Download PDFInfo
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- CN103837776A CN103837776A CN201410099408.9A CN201410099408A CN103837776A CN 103837776 A CN103837776 A CN 103837776A CN 201410099408 A CN201410099408 A CN 201410099408A CN 103837776 A CN103837776 A CN 103837776A
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Abstract
The invention provides an experimental system for voltage stability testing of an AC/DC parallel power network. The system comprises a real-time digital simulator, a digital-to-analogue conversion circuit, a signal power amplifier and an analogue-to-digital conversion circuit, wherein a digital simulated numerical variable signal in the real-time digital simulator is converted into an analogue variable signal through the digital-to-analogue conversion circuit and is output to the signal power amplifier, the signal is changed into an electric variable of the secondary side of an actual transformer through power amplification and is output to an actual power transmission and distribution device (an automatic control device or a protective device), and an output feedback input signal generated by the actual power transmission and distribution device under the action of the electric variable is input into the real-time digital simulator through the analogue-to-digital conversion circuit and then acts on a digital simulation model. In this way, connection between a digital model and a physical object is achieved, the digital-physical closed-loop simulation experimental system is formed, and then the problem that no effective detection mean is available for a power transmission and distribution device is solved and unification of the digital simulation model and an equipment test model is achieved.
Description
Technical field
The application relates to Simulating technique in Electric Power System field, more particularly, relates to a kind of experimental system of AC/DC parallel Network Voltage Stability test.
Background technology
AC/DC parallel operation of power networks state is relevant to current conversion station adjacent domain AC network, in the time that in AC and DC system, either party operating mode changes, all can interact by commutation bus.Especially for the receiving end AC network of extra-high voltage direct-current transmission, the reactive power of the active power of direct current transmission and current conversion station consumption is all occupied sizable ratio in electrical network, in complicated AC and DC interleaving process, the stability of current conversion station ac grid voltage is to analyze the important reference that is subject to electric regional exchange electricity net safety stable after large-sized DC transmission system accesses.
At present, China's " transferring electricity from the west to the east " DC transmission engineering construction is all ± 800kV electric pressure that it is all 500kV electric pressure that east is subject to electric AC network (backbone network), adopts AC/DC parallel transmission system substantially.By before the equipment for power transmission and distribution such as automaton or protective device access AC/DC Power System, need the impact of this equipment for power transmission and distribution of assessment on alternating current-direct current electrical network, avoid causing equipment access after electricity net safety stable reduce.At present, be based on frequency domain method and adopt corresponding electromechanical transient numeral off-line simulation software for AC/DC parallel Network Voltage Stability analysis and evaluation, the basis of this emulation is the frequency-domain model (power frequency equivalent model) of setting up system and equipment component thereof, its advantage is that simulation scale is large, applicable to whole node voltage power frequency stable states or the metastable state analysis of any regional power grid in AC/DC Power System; But shortcoming is, the analysis result drawing belongs to mathematical theory category, cannot carry out the actual effect checking of physical layer, thereby has certain degree of confidence risk being applied to aspect Practical Project; As for equipment for power transmission and distribution, to AC/DC parallel Network Voltage Stability, sex networking on-line testing there is no effective technology means and experimental tool.
Summary of the invention
In view of this, the application provides a kind of experimental system of AC/DC parallel Network Voltage Stability test, for the Network Voltage Stability time-domain-simulation of AC/DC Power System, and solve power transmission and distribution surely control equipment lack the problem of effective detection means and digital simulation model and testing of equipment Unified Model.
To achieve these goals, the existing scheme proposing is as follows:
An experimental system for AC/DC parallel Network Voltage Stability test, comprises Real Time Digital Simulator, D/A converting circuit, analog to digital conversion circuit and signal power amplifier, wherein:
In described Real Time Digital Simulator, have digital simulation model, for emulation AC/DC parallel electrical network dynamic operation condition change procedure, and export numerical variable signal according to the feedback input signal of actual equipment for power transmission and distribution to described actual equipment for power transmission and distribution;
Described D/A converting circuit is for being converted to analog electrical signal by described numerical variable signal;
Described signal power amplifier is used for described analog electrical signal to be enlarged into the secondary side electrical variable of the actual mutual inductor of AC/DC parallel electrical network, and described electrical variable is outputed to described equipment for power transmission and distribution;
Analog-digital conversion circuit as described is for by described actual equipment for power transmission and distribution, the response signal under described electrical variable effect is converted to described feedback input signal and outputs to described Real Time Digital Simulator.
Preferably, described actual equipment for power transmission and distribution is automaton or protective device.
Preferably, described electric signal is voltage signal and/or current signal.
Preferably, described feedback signal is the digital signal of voltage and/or electric current.
Preferably, the digital simulation model of described AC/DC parallel electrical network comprises direct current transportation realistic model, receiving end AC network realistic model and current conversion station control realistic model.
Preferably, described direct current transportation realistic model is ± 800kV DC transmission system realistic model.
Preferably, the 500kV AC network realistic model that described receiving end AC network realistic model is current conversion station adjacent domain.
Preferably, described current conversion station control realistic model comprises that between Rectifier control realistic model, Inverter control realistic model or station, realistic model is controlled in coordination.
Can find out from technique scheme, the experimental system of the grid-connected voltage stability test of alternating current-direct current that the present embodiment provides comprises Real Time Digital Simulator, D/A converting circuit, signal power amplifier and analog to digital conversion circuit, the numerical variable signal of Digital Simulation in Real Time Digital Simulator is converted to analog variable signal and is outputed to signal power amplifier by D/A converting circuit, this signal is the electrical variable of actual mutual inductor secondary side and outputs to actual equipment for power transmission and distribution (automaton or protective device) through power amplification, the output feedback input signal of actual equipment for power transmission and distribution under electrical variable effect inputted into Real Time Digital Simulator and acts on digital simulation model through analog to digital conversion circuit, realize being like this connected of digital model and physics material object, form numeral-physics closed-loop simulation experimental system, thereby can solve the problem that equipment for power transmission and distribution lacks effective detection means and digital simulation model and testing of equipment Unified Model.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or concrete scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiment of the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the Real Time Digital Simulator of the embodiment of the present application and the schematic diagram of model thereof;
Fig. 2 is the structural drawing of a main wiring circuit model of AC/DC parallel electrical network of the embodiment of the present application;
Fig. 3 is the test experiments effect schematic diagram of the embodiment of the present application;
The structural drawing of the experimental system of a kind of AC/DC parallel Network Voltage Stability test that Fig. 4 provides for the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Based on the embodiment in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
Fig. 1 is the Real Time Digital Simulator of the embodiment of the present application and the schematic diagram of model thereof.
As shown in Figure 1, the Real Time Digital Simulator of the present embodiment (RTDS) the 10th, by exchanging the fluctuation situation of commutation busbar voltage under the different operating conditions of digital emulation mode test DC transmission system.
In above-mentioned Real Time Digital Simulator 10, have main wiring circuit model 11 of AC/DC parallel electrical network and secondary control system model 12.
The detailed construction of a main wiring circuit model of above-mentioned AC/DC parallel electrical network as shown in Figure 2, main wiring circuit model comprise ± 800kV extra-high voltage DC transmission system of AC/DC parallel electrical network and receiving end current conversion station adjacent domain 500kV AC network model.
Above-mentioned ± 800kV extra-high voltage DC transmission system model is made up of three parts such as sending end converting plant, receiving end Inverter Station and DC power transmission line.Due to the present embodiment for be that receiving end current conversion station exchanges commutation busbar voltage stability test, therefore sending end AC network can be reduced to the infinitely-great three-phase alternating current constant pressure source of a capacity equivalent model; And the positive and negative electrode of sending end converting plant and receiving end Inverter Station respectively comprises the equipment component model of four 6 pulse conversion bridges, four three-phase double winding converter power transformers, one group of separately-loaded smoothing reactor and one group of DC filter; Receiving end Inverter Station also comprise one group can switching control alternating current filter component models be connected to commutation bus; DC power transmission line model adopts the distribution parameter long wire model of 6 split conductors.
Above-mentioned receiving end current conversion station adjacent domain 500kV AC network model is according to typical three feeder line structure designs.Comprising three 500kV AC Substation thevenin equivalent circuit models that are directly connected with current conversion station and three common-tower double-return 4 split conductor 500kV alternating-current feeding circuit models; Also comprise that a list between AC Substation returns 4 split conductor 500kV alternating current interconnection road models.
Above-mentioned secondary control system model comprises between the utmost point control model of converting plant and Inverter Station and station to be coordinated to control model, has the main copying such as the control of utmost point power, the control of converter valve ignition angle, the control of converter power transformer tap gear, the control of current conversion station alternating current filter switching.Wherein the control of utmost point power comprises the copyings such as the switching of monopolar/bipolar operational mode, power/current control mode switch and through-put power definite value step-by-step adjustment; The control of converter valve ignition angle comprises the copyings such as the adjusting of rectifying valve current deviation, the maximum ignition angle control of inversion valve and preventive control for commutation failure; The control of converter power transformer tap gear comprises the lock-in control emulation between the copyings such as ideal no-load direct voltage adjusting, DC voltage bias adjustment and ignition angle auxiliary adjustment and each function; The control of current conversion station alternating current filter switching comprises the realistic model such as Reactive Power Control and the selection of alternating voltage control model and alternating current filter automatic switching logic.
Fig. 3 is the test experiments effect schematic diagram of the embodiment of the present application.
This time the model emulation operating mode of the Real Time Digital Simulator of experiment is: the through-put power of DC transmission system reduces 0.9PN from rated power PN.In operating condition dynamic changing process, successively there are two alternating current filters automatically to excise, current conversion station exchanges the whole process monitoring waveform of commutation busbar voltage effective value.This test result shows: the steady-state value that 500kV ac grid voltage falls before and after holding in ± 800kV DC transmission system remains unchanged, and falls and in appearance process, also can not produce serious transient overvoltage.
The structural drawing of the experimental system of a kind of AC/DC parallel Network Voltage Stability test that Fig. 4 provides for the embodiment of the present application.
As shown in Figure 4, the experimental system of the present embodiment comprises Real Time Digital Simulator 10, D/A converting circuit 20, signal power amplifier 30 and analog to digital conversion circuit 40.
Real Time Digital Simulator 10 is for emulation AC/DC parallel electrical network dynamic operation condition change procedure, and according to the feedback input signal output numerical variable signal of actual equipment for power transmission and distribution.
D/A converting circuit is converted to analog electrical signal for the numerical variable signal that Real Time Digital Simulator 10 is exported.
Analog to digital conversion circuit 40 is for by actual equipment for power transmission and distribution, the response signal under signal power amplifier 30 electrical variable effects is converted to feedback input signal and outputs to described Real Time Digital Simulator 10.
In the present embodiment, numerical variable signal, analog electrical signal and electrical variable comprise current signal and voltage signal.
Real-timedigital simulation model comprises direct current transportation realistic model, receiving end AC network realistic model and current conversion station control realistic model.Wherein direct current transportation realistic model is ± 800kV DC transmission system realistic model; Receiving end AC network realistic model is the 500kV AC network realistic model of current conversion station adjacent domain; Current conversion station control realistic model is between Rectifier control, Inverter control or station, to coordinate to control realistic model.
Can find out from technique scheme, the experimental system of the grid-connected voltage stability test of alternating current-direct current that the present embodiment provides comprises Real Time Digital Simulator, D/A converting circuit, signal power amplifier and analog to digital conversion circuit, the numerical variable signal of Digital Simulation in Real Time Digital Simulator is converted to analog variable signal and is outputed to signal power amplifier by D/A converting circuit, this signal is the electrical variable of actual mutual inductor secondary side and outputs to actual equipment for power transmission and distribution (automaton or protective device) through power amplification, the output feedback input signal of actual equipment for power transmission and distribution under electrical variable effect inputted into Real Time Digital Simulator and acts on digital simulation model through analog to digital conversion circuit, realize being like this connected of digital model and physics material object, form numeral-physics closed-loop simulation experimental system, thereby can solve the problem that equipment for power transmission and distribution lacks effective detection means and digital simulation model and testing of equipment Unified Model.
In numeral-physics closed-loop experiment, in Real Time Digital Simulator 10, the subelement realistic model of power transmission and distribution control model 12 is replaced by 50 in kind of the power transmission and distribution opertaing device identical with this subelement function.The interface arrangement that Real Time Digital Simulator 10 and equipment for power transmission and distribution 50 consist of D/A converting circuit 20, signal power amplifier 30 and analog to digital conversion circuit 40 is connected to form the closed loop circuit between digital model-physical equipment.Its connected mode and operation mechanism are: in Real Time Digital Simulator 10, the working voltage of digital simulation model and/or current status variable output to the signal input part of signal power amplifier 30 by D/A converting circuit 20, this signal is voltage and/or the electric current variable of actual mutual inductor secondary side and outputs to actual equipment for power transmission and distribution 50 material objects through power amplification, the dynamic response of actual equipment for power transmission and distribution 50 under this voltage and/or the function of current again by analog to digital conversion circuit 40 feed back inputs to RTDS Real Time Digital Simulator 10 and act on the simulation run of digital simulation model.
AC/DC parallel electrical network comprise ± 800kV of main wiring circuit model 11 extra-high voltage DC transmission system realistic model, receiving end current conversion station adjacent domain 500kV AC network realistic model and current conversion station Simulation Control Model in above-mentioned Real Time Digital Simulator 10.Wherein ± 800kV extra-high voltage DC transmission system realistic model is divided into sending end converting plant, three parts such as receiving end Inverter Station and DC power transmission line, due to the application for be receiving end ac grid voltage stability test, therefore sending end AC network can be reduced to the infinitely-great three-phase alternating current constant pressure source of a capacity equivalent model, and sending end converting plant and receiving end Inverter Station are just, negative pole respectively comprises four 6 pulsation rectifier bridges, four three-phase double winding converter power transformers, the equipment component model of one group of separately-loaded smoothing reactor and one group of DC filter, receiving end Inverter Station also comprise one group can switching control alternating current filter component models be connected to commutation bus, DC power transmission line model adopts the distribution parameter long wire model of 6 split conductors.Receiving end Inverter Station adjacent domain 500kV AC network realistic model structural design depends on the hardware resource limitations of actual electric network structure and Real Time Digital Simulator, in theory as long as the hardware resource of Real Time Digital Simulator is enough abundant, AC network model can comprise whole 500kV nodes, but the hardware cost of modeling is too expensive like this, in order to obtain best simulated effect under the hardware resource condition limited, the application proposes the simplified design principle of a 500kV AC network model structure: in model, only contain the AC Substation bus nodes that has transmission line of electricity to be directly connected with current conversion station commutation bus nodes, comprise the interconnection model between model of power transmission system and the AC Substation between current conversion station and AC Substation, AC Substation 500kV bus nodes is with the equivalence of Dai Weinan circuit model, amplitude/the phase place and the impedance thereof that are Dai Weinan voltage source are determined according to trend distribution and the node capacity of short circuit of actual operating.Current conversion station Simulation Control Model comprise converting plant and Inverter Station utmost point control model and station between coordinate control model, have the main functional modules such as the control of utmost point power, the control of converter valve ignition angle, the control of converter power transformer tap gear, current conversion station alternating current filter switching control model, wherein utmost point power control module comprises the switching of monopolar/bipolar operational mode, power/current control mode switch and through-put power definite value step-by-step adjustment function; Converter valve ignition angle control module comprises the functions such as the adjusting of rectifying valve current deviation, the maximum ignition angle control of inversion valve and preventive control for commutation failure; Converter power transformer tap gear control module comprises the lock-in control between the functions such as ideal no-load direct voltage adjusting, DC voltage bias adjustment and ignition angle auxiliary adjustment and each function; Current conversion station alternating current filter switching control module comprises Reactive Power Control and alternating voltage control model is selected and alternating current filter automatic switching logical model.
The man-machine interactive interface of above-mentioned experimental system is placed in the software platform of Real Time Digital Simulator 10, be provided with the on-line monitoring component models such as the on-line operation mounted casts such as through-put power instruction litter, operational mode change-over switch, control model selector switch and various oscillograph, instrument, SCADA system (the Supervisory Control And Data Acquisition of look & feel and actual electric network, be data acquisition and supervisor control) similar, embody the digitalized signature of dynamic simulation experiment of electric power system distinctness.
The D/A converting circuit 20 of above-mentioned experimental system, the configuration connected mode of the interface arrangements such as analog to digital conversion circuit 40 and signal power amplifier 30 has taken into full account the applicability of numeral-physics closed-loop simulation to Practical Project, that is: D/A converting circuit 20 forms the digital simulation model of Real Time Digital Simulator at the voltage transformer (VT) summation current transformer of physical layer together with signal power amplifier 30, gain by suitable adjusting digital-to-analog ratio binding signal power amplifier 30, can build neatly the mutual inductor of different no-load voltage ratios, the output terminal of signal power amplifier 30 is mutual inductor secondary side Equivalent Physical variable and acts on physical device 50 and makes equipment as access actual electric network, the condition responsive of tested equipment under this effect changes to be inputted Real Time Digital Simulator and is acted on digital simulation model by analog to digital conversion circuit again, makes model running state generation respective change.
Can find out from technique scheme, the experimental system tool that the application provides has the following advantages and beneficial effect: 1. numeral-physical model the technology of closed loop adopting by the real-time of the high efficiency of Digital Simulation, security, accuracy and physical simulation, intuitive, reliability is organic combines together, and the detection that networks of AC/DC parallel Network Voltage Stability analysis and evaluation and voltage-stabilizing controller is unified in an emulation experiment model; 2. major loop structure model that have in Real Time Digital Simulator ± 800kV extra-high voltage DC transmission system is detailed and linear quadratic control model, the various steady state operating conditions of analog DC system and temporal variations process neatly, with the influencing each other each other of electrical network AC and DC side in real-time emulation method accurate evaluation straight-flow system dynamic operation; 3. make the closed loop on-line test of power transmission and distribution opertaing device and accessed actual electric network to there is equal physical influence.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the application.To be apparent for those skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the case of not departing from the application's spirit or scope, realize in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. an experimental system for AC/DC parallel Network Voltage Stability test, is characterized in that, comprises Real Time Digital Simulator, D/A converting circuit, analog to digital conversion circuit and signal power amplifier, wherein:
In described Real Time Digital Simulator, have digital simulation model, for emulation AC/DC parallel electrical network dynamic operation condition change procedure, and export numerical variable signal according to the feedback input signal of actual equipment for power transmission and distribution to described actual equipment for power transmission and distribution;
Described D/A converting circuit is for being converted to analog electrical signal by described numerical variable signal;
Described signal power amplifier is used for described analog electrical signal to be enlarged into the secondary side electrical variable of the actual mutual inductor of AC/DC parallel electrical network, and described electrical variable is outputed to described equipment for power transmission and distribution;
Analog-digital conversion circuit as described is for by described actual equipment for power transmission and distribution, the response signal under described electrical variable effect is converted to described feedback input signal and outputs to described Real Time Digital Simulator.
2. experimental system as claimed in claim 1, is characterized in that, described actual equipment for power transmission and distribution is automaton or protective device.
3. experimental system as claimed in claim 1, is characterized in that, described electric signal is voltage signal and/or current signal.
4. experimental system as claimed in claim 1, is characterized in that, described feedback signal is the digital signal of voltage and/or electric current.
5. the experimental system as described in claim 1～4 any one, is characterized in that, the digital simulation model of described AC/DC parallel electrical network comprises direct current transportation realistic model, receiving end AC network realistic model and current conversion station control realistic model.
6. experimental system as claimed in claim 5, is characterized in that, described direct current transportation realistic model is ± 800kV DC transmission system realistic model.
7. experimental system as claimed in claim 5, is characterized in that, the 500kV AC network realistic model that described receiving end AC network realistic model is current conversion station adjacent domain.
8. experimental system as claimed in claim 5, is characterized in that, described current conversion station control realistic model comprises that between Rectifier control realistic model, Inverter control realistic model or station, realistic model is controlled in coordination.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104199307A (en) * | 2014-08-28 | 2014-12-10 | 广州供电局有限公司 | Hardware-in-loop simulation method and system |
| CN106980273A (en) * | 2016-01-19 | 2017-07-25 | 帝斯贝思数字信号处理和控制工程有限公司 | Simulator and the method for emulation |
| CN111679235A (en) * | 2020-04-07 | 2020-09-18 | 南方电网科学研究院有限责任公司 | Real-time simulation test method and device for electromagnetic transformer measuring system |
| CN116088461A (en) * | 2022-07-14 | 2023-05-09 | 中国电力科学研究院有限公司 | Stability control device testing system and method, storage medium and electronic equipment |
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