CN103368208A - Intelligent integrated control device for flexible power grid access of distributed solar power stations - Google Patents
Intelligent integrated control device for flexible power grid access of distributed solar power stations Download PDFInfo
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- CN103368208A CN103368208A CN2013103482976A CN201310348297A CN103368208A CN 103368208 A CN103368208 A CN 103368208A CN 2013103482976 A CN2013103482976 A CN 2013103482976A CN 201310348297 A CN201310348297 A CN 201310348297A CN 103368208 A CN103368208 A CN 103368208A
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Abstract
The invention discloses an intelligent integrated control device for flexible power grid access of distributed solar power stations. The intelligent integrated control device comprises a DSP (Digital Signal Processing) central control module, an analog data acquisition module, a digital input module, a digital control module, a switch output module, a man-machine interface, an LCD/LED (Liquid Crystal Display-Light Emitting Diode) display, a power grid, photovoltaic power plant and load condition module, a power grid generation requirement module, a power grid dispatching and monitoring module and an anti-interference shell. The device has the advantages that the access and removal are flexible, and the operation on electrical equipment is smooth and stable, so that sparks and abrasion caused by hard operation are avoided, and the service life of the equipment is prolonged; furthermore, due to the intelligent functions of the device, many manual operating processes can be replaced, the misoperation caused by manual operation can be avoided, and the existing integrated automatic control systems can be replaced partially or totally, so that the device can become an important component part of a smart power grid.
Description
Technical field
The invention belongs to solar energy power generating and intelligent grid technical field, be specifically related to the flexible access of a kind of intelligent distributed solar power station electric network synthetic control device.
Background technology
The solar power station grid integration is the field of just rising recent years; owing to belong to new industry; be main mainly with the distributed power station of low capacity; its access way is also fairly simple; general traditional automation equipment such as protective relaying device just can be competent at; but the development along with whole industry; capacity enlarges gradually; solar power station is the trend of directed set Chinese style development also; existing protective relaying device can not be fully competent; because Protection Technology is on the platform of single-chip microcomputer; realize simple switch motion, this technology is still effective for the solar power station of low capacity, but at large capacity solar power station; the quick conversion that simple switch motion can't solve energy effectively is in also can't effectively following the tracks of; the transient change of external variable.
Inverter and switch disconnector are the intermediate link of solar power station opto-electronic conversion; be called primary equipment; according to designing requirement; these electric equipments are connected to electrical network also needs a cover protective relaying device, and the effect of protection equipment is played in input and the excision of control appliance on the other hand on the one hand; be called the secondary relaying protection; relaying protection adds some automatically control and Presentation Functions, consists of a cover total management system, solar power station access way commonly used that Here it is.As everyone knows; Protection Technology is based on the logic switch operating principle; its control model is discrete type; i.e. " rigid " access; the advantage of discrete control is simple, directly perceived; and shortcoming is very flexible, and the switch frequent movement causes equipment dependability poor, and the photovoltaic DC-to-AC converter overall efficiency is also low in the solar power station.
Summary of the invention
Goal of the invention: for the deficiencies in the prior art, the purpose of this invention is to provide the flexible access of a kind of intelligent distributed solar power station electric network synthetic control device, adopt flexible access, excision, the useful life of increase equipment, and raising intelligent functions, existing integrated automation control system can be partly or entirely replaced, the important component part of intelligent grid will be become.
Technical scheme: in order to realize the foregoing invention purpose, the technical solution used in the present invention is as follows:
The flexible access of a kind of intelligent distributed solar power station electric network synthetic control device, comprise that DSP central control module, analog data collection touch the input of piece, digital quantity and touch piece, discrete control and touch that piece, switching value output module, man-machine interface, LCD/LED show, electrical network, photovoltaic plant and load condition module, grid generation require module, dispatching of power netwoks and supervision module and anti-interference housing; Described LCD/LED demonstration is located on the anti-interference housing, links to each other with the DSP central control module by man-machine interface; Described analog data collection touches that piece is touched in the input of piece, digital quantity, discrete control is touched piece, switching value output module and all linked to each other with the DSP central control module, and described analog data collection touches that piece, digital quantity input are touched piece, discrete control is touched piece, switching value output module and DSP central control module and all is located in the anti-interference housing; Described electrical network, photovoltaic plant requires module, dispatching of power netwoks all to link to each other with the DSP central control module with the supervision module with load condition module, grid generation.
Described discrete control is touched piece and is linked to each other with photovoltaic inverter, continuous type dynamic reactive compensation device, continuous type harmonic suppression apparatus.
Described switching value output module links to each other with energy-storage units, external switch equipment.
Described DSP central control module adopts TI320 series DSP processor.
Described analog data collection is touched piece and is adopted AD676 as analogue collection module.
The flexible access of this intelligent distributed solar power station electric network synthetic control device adopts DSP to substitute single-chip microcomputer commonly used in the relaying protection; its effect is fully different; DSP has very strong computing function; on such platform; a kind of control model is proposed; its control variables mainly is analog quantity; but not the digital quantity of commonly using in the relaying protection; analog quantity is some continually varying variablees; the operation of each equipment is with regard to the state of groundwork in continuous adjusting; i.e. " flexibility " operating state; if need to be operated in some extremity, the variable of regulating continuously such as only have to reach capacity after, just start discrete control; and equipment at this moment has been operated in underloading or no-load situation, and its switch motion is without detriment to the performance of equipment.Further, based on DSP platform development pattern recognition function out, will predict to the operating state in future that namely intelligent, these functions all are that traditional Protection Technology does not possess.
Beneficial effect: compared with prior art, the flexible access of intelligent distributed solar power station of the present invention electric network synthetic control device, flexible access, flexible excision, the action of electric equipment is level and smooth and stable, avoid increasing the useful life of equipment by " rigid " action spark and the wearing and tearing that bring; In addition, the intelligent functions of this device can replace a lot of manual operation processes, also can avoid simultaneously because " misoperation " that manual operation brings can partly or entirely replace existing integrated automation control system, will become the important component part of intelligent grid; Have good practicality, can produce preferably economic benefit and social effect.
Description of drawings
Fig. 1 is the design principle figure of the flexible access of intelligent distributed solar power station electric network synthetic control device;
Fig. 2 is the structural representation of anti-interference housing.
Embodiment
The present invention is described further below in conjunction with concrete accompanying drawing.
As depicted in figs. 1 and 2, the flexible access of intelligent distributed solar power station electric network synthetic control device, mainly contain with lower member: DSP central control module, analog data collection are touched piece (16 tunnel), digital quantity input and are touched piece (16 tunnel), discrete control and touch piece (16 tunnel), man-machine interface, LCD/LED and show and anti-interference housing; The LCD/LED demonstration is located on the anti-interference housing, links to each other with the DSP central control module by man-machine interface; Analog data collection touches that piece is touched in the input of piece, digital quantity, discrete control is touched piece and all linked to each other with the DSP central control module, and they all are located in the anti-interference housing.Because the complete function of the flexible access of this intelligent distributed solar power station electric network synthetic control device needs and external equipment is coordinated just can finish, therefore, the external equipment that also needs comprises: electrical network, photovoltaic plant and load condition module, grid generation requirement module and dispatching of power netwoks and supervision module, photovoltaic inverter (photovoltaic DC-to-AC converter), continuous type dynamic reactive compensation device, continuous type harmonic suppression apparatus, energy-storage units, external switch equipment; Electrical network, photovoltaic plant requires module, dispatching of power netwoks all to link to each other with the DSP central control module with the supervision module with load condition module, grid generation.Discrete control is touched piece and is linked to each other with photovoltaic inverter, continuous type dynamic reactive compensation device, continuous type harmonic suppression apparatus.Switching value output module links to each other with energy-storage units, external switch equipment.Divide input, output, external control and variable feedback with upper module, and the control between each module divides fast and at a slow speed minute, wherein the dynamic compensation of " isolated island " safety, load instantaneous buckles belongs to quick controlled quentity controlled variable, and energy output demand, reactive power compensation belong at a slow speed controlled quentity controlled variable, the characteristics of this device are with according to actual needs, take into account quick controlled quentity controlled variable and the at a slow speed output of controlled quentity controlled variable.
The flexible access of this intelligent distributed solar power station electric network synthetic control device, during work, the DSP central control module is processed according to the data message of the electrical network, photovoltaic plant and the user's situation module that receive; Analog Data Acquistion Module (input) processes existing (comprising in the past) data as the initial value of DSP central control module and feedback quantity; Grid generation requires module will propose the generating requirement, is generally active power, and the DSP central control module will according to the capacity of solar power station, the actual power that can generate electricity, determine the power points of each photovoltaic DC-to-AC converter work this moment.This power points can be at maximum power point (MPPT), also can be at other power points, when at other power points, need to regulate the direct voltage of photovoltaic DC-to-AC converter, even energy-storage units for subsequent use, this function is extremely important, if the power that solar power station sends is greater than the demand of electrical network, according to being used to reason, just need to close some photovoltaic DC-to-AC converters, namely " rigid " of inverter thrown, cut, and now because the continuously output of regulating power, photovoltaic DC-to-AC converter has just become the device of quiescent operation, an important step of this formation " flexibility " access.
Except to the active power demand, electrical network also needs to replenish reactive power, this in order to improve power factor (PF), reduces loss, on the other hand for burning voltage on the one hand, this device is also exported a continuous reactive power demand, its requirement can be regulated the external equipment of reactive power continuously, such as continuous type dynamic reactive compensation device SVC, or continuous type dynamic reactive generator SVG, provide continuous reactive power, second link of this formation " flexibility " access.
The flexible operation of active power and reactive power is even more important to large capacity solar power station, and these power stations frequently large capacity are dropped into or withdrawed from, not only electrical network do not allow, user's oneself equipment is easily damage also.As when adopting flexibility process and needing excision power station power stage, all equipment will reach minimum maximal work state, and rely on digital quantity input module this moment again, and switching value output module is provided, and then control external switch equipment or energy-storage units.
In order further to improve the practicality of this device, this device also calculates the harmonic wave of user and solar power station photovoltaic DC-to-AC converter generation itself in real time, if harmonic wave surpasses harmful degree, some responsive equipment will be closed, can certainly increase external equipment such as continuous type harmonic suppression apparatus AF suppresses external harmonic wave, perhaps eliminate the harmonic wave that self produces.This function is even more important to the solar power station of generating power for their own use, if harmonic wave can not enter system, just will enter photovoltaic DC-to-AC converter and form the loop, reduce the efficient of photovoltaic DC-to-AC converter, even burning photovoltaic DC-to-AC converter, this device provides " flexibility " harmonic elimination fuction output, is only needing harmonic elimination, and do not need to be even more important in the situation of compensating reactive power, this is the three functions of flexible access.
More than these parameters, such as the operating state of meritorious power, reactive power, harmonic wave and solar power station, all can be transferred to upper level dispatching of power netwoks and supervision module, the usefulness of electric power system scheduling and safety in production by reliable communication tool.Certainly, all these information also can by man-machine interface, be presented in the LCD/LED demonstration of this device on the spot.
As a very important function, this device embodies very large superiority at anti-" isolated island ", if the external electrical network system " has a mind to " or the outage of " being not intended to ", this just needs solar power station to excise from electrical network rapidly, in case " isolated island " occurs, if the outage of " having a mind to " needs maintenance such as outside line, solar power station need to excise photovoltaic DC-to-AC converter step by step; And if the outage of " being not intended to ", such as the outside line catastrophic failure, just dangerous when overlapping again, this just needs photovoltaic DC-to-AC converter to excise rapidly, and no matter be the outage of " having a mind to " or " being not intended to ", as long as " isolated island " occurs, the photovoltaic DC-to-AC converter of solar power station all is to move under loading condition, i.e. " rigid " excision, this reliability to equipment is unfavorable, also has potential safety hazard, this device will from external detection to electrical network, photovoltaic plant and load condition module data information, judge rapidly on " isolated island " that be not to disconnect immediately photovoltaic DC-to-AC converter this moment, but allow inverter run to the minimum power point from maximum power point rapidly, the control variables of this moment is exactly power stage, power stage and electric current are directly proportional, single argument output (electric current), and input signal has also become simple set point, the switch of disconnecting external switchgear in the situation that does not substantially have electric current, i.e. " flexibility " excision.Be furnished with energy storage unit unit when solar power station, this function shows its superiority more.
This device in use, the user gets final product parameter in addition as long as connect outside line (rear portion) according to explanation by the LED input, last device can be installed in the solar power station scene.
This device technique based on analog quantity control, adopt optimized TI320 series DSP processor as calculate platform, adopt simultaneously AD676 as analogue collection module, these devices are all through just selecting after many tests, when selecting the control model, the control model of manual intelligent, and exponential weighting, the response Technology of Flexibility of naturally delaying time, also through repeatedly just determining after authentication and the Computer Simulation, certainly, these functions and module also can otherwise realize, replace DSP such as the industrial and mineral computer generation, operational capability is stronger, but a little less than the control function; Replace nonlinear Flexibility Control Technique with traditional closed-loop control with preposition control for another example, but the control surplus of closed-loop control first, stability is also poor during multivariable output, so this product technology is optimized technology.
The flexible access of this intelligent distributed solar power station electric network synthetic control device, flexible access, flexible excision, the action of electric equipment is level and smooth and stable, avoids the spark and the wearing and tearing that are brought by " rigid " action, increases the useful life of equipment; In addition, the intelligent functions of this device can replace a lot of manual operation processes, also can avoid simultaneously because " misoperation " that manual operation brings can partly or entirely replace existing integrated automation control system, will become the important component part of intelligent grid.
Claims (5)
1. an intelligent distributed solar power station flexibility accesses the electric network synthetic control device, it is characterized in that: comprise that DSP central control module, analog data collection touch the input of piece, digital quantity and touch piece, discrete control and touch that piece, switching value output module, man-machine interface, LCD/LED show, electrical network, photovoltaic plant and load condition module, grid generation require module, dispatching of power netwoks and supervision module and anti-interference housing; Described LCD/LED demonstration is located on the anti-interference housing, links to each other with the DSP central control module by man-machine interface; Described analog data collection touches that piece is touched in the input of piece, digital quantity, discrete control is touched piece, switching value output module and all linked to each other with the DSP central control module, and described analog data collection touches that piece, digital quantity input are touched piece, discrete control is touched piece, switching value output module and DSP central control module and all is located in the anti-interference housing; Described electrical network, photovoltaic plant requires module, dispatching of power netwoks all to link to each other with the DSP central control module with the supervision module with load condition module, grid generation.
2. intelligent distributed solar power station flexibility according to claim 1 accesses the electric network synthetic control device, and it is characterized in that: described discrete control is touched piece and linked to each other with photovoltaic inverter, continuous type dynamic reactive compensation device, continuous type harmonic suppression apparatus.
3. intelligent distributed solar power station flexibility according to claim 1 accesses the electric network synthetic control device, and it is characterized in that: described switching value output module links to each other with energy-storage units, external switch equipment.
4. the flexible access of intelligent distributed solar power station according to claim 1 electric network synthetic control device is characterized in that: described DSP central control module employing TI320 series DSP processor.
5. intelligent distributed solar power station flexibility according to claim 1 accesses the electric network synthetic control device, it is characterized in that: described analog data collection is touched piece and is adopted AD676 as analogue collection module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104218838A (en) * | 2014-07-30 | 2014-12-17 | 新疆荣信节能电气有限公司 | Photovoltaic grid-connected inverter with function of adaptive harmonic in-place control |
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Application publication date: 20131023 |