CN106711925B - self-adaptive three-phase reclosing lock for single loop outgoing line of wind power plant and method thereof - Google Patents

self-adaptive three-phase reclosing lock for single loop outgoing line of wind power plant and method thereof Download PDF

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Publication number
CN106711925B
CN106711925B CN201611222877.0A CN201611222877A CN106711925B CN 106711925 B CN106711925 B CN 106711925B CN 201611222877 A CN201611222877 A CN 201611222877A CN 106711925 B CN106711925 B CN 106711925B
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wind power
power plant
phase
line
fault
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CN106711925A (en
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李凤婷
解超
路亮
陶仁峰
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Xinjiang University
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Xinjiang University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/027—Details with automatic disconnection after a predetermined time
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Wind Motors (AREA)

Abstract

The invention belongs to the technical field of wind power generation, and particularly relates to a single-loop back outgoing line self-adaptive three-phase reclosing strategy for a wind power plant. According to the strategy, after the single-feedback outgoing line three-phase tripping of the wind power plant is realized, the time for maintaining the transient stability of the wind power plant is prolonged; at the same time, the fault nature of the sending-out line is judged: when the fault is transient and disappears, the reclosing action is enabled to coincide with the line, and when the fault is permanent, the reclosing is locked and the line is not coincident. On the premise of prolonging the transient stability time of the wind power plant, the method realizes the rapid judgment of the fault property of the outgoing line of the wind power plant, effectively improves the success rate of the superposition of the outgoing line of the wind power plant after three-phase tripping, and avoids the secondary impact on the system caused by the transient fault superposed on the permanent fault or not disappeared.

Description

self-adaptive three-phase reclosing lock for single loop outgoing line of wind power plant and method thereof
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a single-loop back outgoing line self-adaptive three-phase reclosing lock for a wind power plant.
background
Wind power resources in China are far away from a load center, and electric energy generated by a wind power place is collected to a wind power plant sending-out line (110 kV-330 kV) through a current collection circuit and then sent to an electric network and is sent to the load center through a higher-voltage-class (750kV) electric transmission line. This way of energy delivery is such that: (1) the wind power plant has no local load or only small load; (2) the output line of the wind power plant is mostly single-loop.
The wind power plant is designed according to the principle of maximum power tracking and does not have the capability of rapid frequency modulation and voltage regulation. Therefore, once the single-loop outgoing line of the wind power plant is tripped by three phases, a large amount of active surplus of the wind power plant can cause the wind power plant to rapidly lose stability due to out-of-limit frequency and voltage, and the probability of successful synchronous reclosing of the wind power plant side detection is extremely low. If the wind power plant cannot be successfully superposed, the wind power plant needs to be connected with the grid again through the processes of fault location and processing, checking and verification, reporting and scheduling, connecting the grid again and the like. This process takes at least 48 hours, which causes non-negligible economic losses to the wind farm.
At present, the coincidence strategy after the three phases of a single loop-back outgoing line of a wind power plant are tripped is as follows: and the coincidence mode of the detection period is abandoned on the side of the wind power plant, and the mode of detecting the voltage of a bus non-pressure line is adopted instead, namely the coincidence can be realized after all wind power generation sets in the wind power plant are cut. Although the time consumed by re-grid connection of the wind power plant is effectively reduced, the purpose of maintaining the power supply reliability of the wind power plant still cannot be achieved; the method does not judge the line fault property before superposition, and once the line fault is superposed on a permanent fault or an instantaneous fault which does not disappear, secondary impact is caused to the system.
Disclosure of Invention
aiming at the problems, the invention provides a single-loop back outgoing line self-adaptive three-phase reclosing strategy for a wind power plant; according to the strategy, after the single-feedback outgoing line three-phase tripping of the wind power plant is realized, the time for maintaining the transient stability of the wind power plant is prolonged; at the same time, the fault nature of the sending-out line is judged: when the fault is transient and disappears, the reclosing action is enabled to coincide with the line, and when the fault is permanent, the reclosing is locked and the line is not coincident. On the premise of prolonging the transient stability time of the wind power plant, the method realizes the rapid judgment of the fault property of the outgoing line of the wind power plant, effectively improves the success rate of the superposition of the outgoing line of the wind power plant after three-phase tripping, and avoids the secondary impact on the system caused by the transient fault superposed on the permanent fault or not disappeared.
the invention provides a self-adaptive three-phase reclosing strategy for a single loop back outgoing line of a wind power plant, which comprises the following specific contents:
a proper amount of substitute load is additionally arranged on the low-voltage side of a main transformer at the outlet of the wind power plant, and partial fans are cut off if necessary, so that the time for maintaining the transient stability of the isolated grid of the wind power plant is prolonged, and the time for the synchronous coincidence of the side detection of the wind power plant is won; charging capacitors are additionally arranged on the side of a wind power plant of a transmission line of the wind power plant, three phases of the transmission line are tripped out, the charging capacitors are put into the wind power plant after fixed time delay, whether line faults disappear or not is judged in a circulating mode by detecting the voltage change characteristics of the charging capacitors, the faults are allowed to coincide after instantaneous faults disappear, and the faults do not coincide with each other before the faults disappear and the permanent faults, so that secondary impact caused by coincidence failure is avoided.
The method comprises the following concrete steps:
1) The method comprises the following steps that after three phases of a wind power plant outgoing line are tripped, an alternative load is input, the alternative load is a variable resistor, the capacity of the variable resistor is P Rmax, the size of the alternative load is set according to the difference between annual average output P W of the wind power plant and local annual average load P L, and the alternative load is characterized in that:
PRmax＝PW-PL (1)
After the three-phase tripping of the outgoing line of the wind power plant, if the transmission power P 0 of the outgoing line is not more than P Rmax before the fault, inputting an alternative load to maintain the stability of the wind power plant side, wherein the accessed alternative load capacity is as follows:
PR＝P0 (2)
If the transmission power P 0 of the outgoing line before the fault is greater than P Rmax, the maximum-capacity alternative load P R.max is thrown, and meanwhile, the alternative load capacity of partial fan capacity access with the wind power plant cut-off output of P WC is as follows:
PR＝PRmax＝P0-PWC (3)
2) Judging the reason of tripping of the circuit breaker, and if the reason is the stealing trip, quickly superposing and then gradually cutting off the alternative load; if the operation is manual, the lines are not overlapped, and the substitute load is cut off. Otherwise go to 3).
3) Considering the circuit arc extinguishing time, the three-phase charging capacitor charged with different voltages is accessed in a time delay of 0.5s, and the connection time delta t is 0.1 s.
4) and judging whether the line recovers to a normal state or not based on the capacitance voltage value of each phase. During capacitor access, if the three-phase charging capacitor voltage, namely the three-phase voltage attenuation at the capacitor connection position does not exceed a setting value, the line fault is determined to be instantaneous and disappeared, namely:
in the formula (4), u X (t N) is each phase voltage of a capacitor access point during the access period of a charging capacitor, X is A, B, C, t N is the Nth access time of the capacitor, delta t is the time length of one detection, k is a setting value close to zero, after an oscillation circuit disappears, the voltage fluctuation is small, the k value is 3%, and if at least one phase of three-phase voltage has the attenuation characteristic, the circuit is judged not to be recovered to be normal.
if the fault disappears, the lines are superposed after the charging capacitor is cut off. If the circuit is still not normal, the capacitance switch is disconnected, and each phase of capacitor is recharged for 0.2 s. Return execution 3) -4).
5) And if the line is not recovered to be normal after 5 judgment periods, judging that the line has a permanent fault and is not overlapped, cutting off the substitute load, and stopping the operation of the wind power plant.
The alternative load used by the invention is an air-cooled resistor cabinet with capacity capable of being switched step by step, the charging capacitor is a BMSJ1.14-15-3 type three-phase capacitor, and the direct current power supply is a BTK-12001 type high-voltage direct current stabilized power supply.
The invention is characterized in that: a self-adaptive three-phase reclosing strategy for a single loop-back outgoing line of a wind power plant is provided. According to the strategy, replacement load is input at a main transformer at the outlet of the wind power plant, and partial fans are cut off when necessary, so that the time for maintaining the transient stability of the isolated grid of the wind power plant is prolonged, and the time for synchronously coincident detection of the wind power plant is won; charging capacitors are additionally arranged on the side of a wind power plant of a transmission line of the wind power plant, three phases of the transmission line are tripped out, the charging capacitors are put into the wind power plant after fixed time delay, whether line faults disappear or not is judged in a circulating mode by detecting the voltage change characteristics of the charging capacitors, the faults are allowed to coincide after instantaneous faults disappear, and the faults do not coincide with each other before the faults disappear and the permanent faults, so that secondary impact caused by coincidence failure is avoided.
drawings
FIG. 1 is a diagram of the access position of the charging capacitor and alternative load of the present invention.
the wind power station comprises a wind power plant A, a main transformer B, a capacitor C, a circuit breaker D, a storage battery E, an R alternative load, a load switch K r, a capacitance switch K c and a storage battery switch K b.
FIG. 2 is a flow chart of the operation of the present invention.
FIG. 3 is a graph showing the phase voltage curves of the outgoing line during the period of inputting the charging capacitor in the phase A ground fault state of the outgoing line of the wind farm.
Fig. 4 is a graph of the voltage curve of each phase of the outgoing line during the period of inputting the charging capacitor in the two-phase earth fault state of the outgoing line AB of the wind power plant.
FIG. 5 is a graph showing the phase voltage curves of the outgoing line during the period of charging the capacitor in the three-phase ground fault state of the outgoing line of the wind farm.
Fig. 6 is a graph of the voltage curve of each phase of the output line during the period of inputting the charging capacitor in the two-phase short-circuit fault state of the output line AB of the wind power plant.
FIG. 7 is a graph showing the phase voltage curves of the outgoing line during the period of charging the capacitor in the three-phase short-circuit fault state of the outgoing line of the wind farm.
Fig. 8 is a graph showing the voltage curve of each phase of the output line when the wind farm output line is put into the charging capacitor after the fault disappears.
FIG. 9 is a comparison graph of wind farm outlet voltage for the reclosing strategy of the present invention versus the traditional reclosing strategy when wind farm outlet output is greater than the alternative load capacity.
Fig. 10 is a comparison graph of wind farm outlet voltage for the reclosing strategy of the present invention and the conventional reclosing strategy when wind farm outgoing line output is less than or equal to the alternative load capacity.
Detailed Description
the invention provides a self-adaptive three-phase reclosing lock for a single loop back outgoing line of a wind power plant and a method thereof, which specifically comprise the following steps:
a proper amount of substitute load is additionally arranged on the low-voltage side of a main transformer at the outlet of the wind power plant, and partial fans are cut off if necessary, so that the time for maintaining the transient stability of the isolated grid of the wind power plant is prolonged, and the time for the synchronous coincidence of the side detection of the wind power plant is won; charging capacitors are additionally arranged on the side of a wind power plant of a transmission line of the wind power plant, three phases of the transmission line are tripped out, the charging capacitors are put into the wind power plant after fixed time delay, whether line faults disappear or not is judged in a circulating mode by detecting the voltage change characteristics of the charging capacitors, the faults are allowed to coincide after instantaneous faults disappear, and the faults do not coincide with each other before the faults disappear and the permanent faults, so that secondary impact caused by coincidence failure is avoided.
The method comprises the following concrete steps:
1) The method comprises the following steps that after three phases of a wind power plant outgoing line are tripped, an alternative load is input, the alternative load is a variable resistor, the capacity of the variable resistor is P Rmax, the size of the alternative load is set according to the difference between annual average output P W of the wind power plant and local annual average load P L, and the alternative load is characterized in that:
PRmax＝PW-PL (1)
after the three-phase tripping of the outgoing line of the wind power plant, if the transmission power P 0 of the outgoing line is not more than P Rmax before the fault, inputting an alternative load to maintain the stability of the wind power plant side, wherein the accessed alternative load capacity is as follows:
PR＝P0 (2)
If the transmission power P 0 of the outgoing line before the fault is greater than P Rmax, the maximum-capacity alternative load P R.max is thrown, and meanwhile, the alternative load capacity of partial fan capacity access with the wind power plant cut-off output of P WC is as follows:
PR＝PRmax＝P0-PWC (3)
2) Judging the reason of tripping of the circuit breaker, and if the reason is the stealing trip, quickly superposing and then gradually cutting off the alternative load; if the operation is manual, the lines are not overlapped, and the substitute load is cut off. Otherwise go to 3).
3) Considering the circuit arc extinguishing time, the three-phase charging capacitor charged with different voltages is accessed in a time delay of 0.5s, and the connection time delta t is 0.1 s.
4) And judging whether the line recovers to a normal state or not based on the capacitance voltage value of each phase. During capacitor access, if the three-phase charging capacitor voltage, namely the three-phase voltage attenuation at the capacitor connection position does not exceed a setting value, the line fault is determined to be instantaneous and disappeared, namely:
In the formula (4), u X (t N) is each phase voltage of a capacitor access point during the access period of a charging capacitor, X is A, B, C, t N is the Nth access time of the capacitor, delta t is the time length of one detection, k is a setting value close to zero, after an oscillation circuit disappears, the voltage fluctuation is small, the k value is 3%, and if at least one phase of three-phase voltage has the attenuation characteristic, the circuit is judged not to be recovered to be normal.
If the fault disappears, the lines are superposed after the charging capacitor is cut off. If the circuit is still not normal, the capacitance switch is disconnected, and each phase of capacitor is recharged for 0.2 s. Return execution 3) -4).
5) And if the line is not recovered to be normal after 5 judgment periods, judging that the line has a permanent fault and is not overlapped, cutting off the substitute load, and stopping the operation of the wind power plant.
The detailed description is as follows:
According to the access positions of the charging capacitor and the substitute load shown in the figure 1, the charging capacitor and the substitute load are accessed to the corresponding positions of a transmitting line of a certain 49.5MW wind power plant in Xinjiang. The electric energy generated by the wind power plant is sent out through a single loop with the length of 100km through an 35/220kV main transformer. The difference between the annual average output and the local annual average load of the wind power plant is about 65% of the maximum output of the wind power plant, and the maximum capacity of the substitute load is set to be 33MW by considering a certain margin according to the method for selecting the substitute load capacity. And when the time is set to be 1.5s, the midpoint of the output line fails, and the failure time duration is 0.7 s.
And when the time is 1.51s, the three phases of the outgoing line are tripped out and are connected into the substitute load, the charging capacitor is connected into the substitute load after 2.01s, and the connection time is 0.1 s. When the fault types are A-phase grounding, AB-phase grounding, three-phase grounding, AB-phase short circuit and three-phase metal short circuit faults respectively, the fault transition resistances are 100 omega, and the fault transition resistances are 100 omega, 2.01 s-2.11 s are connected into the charging capacitor for the first time, and the attenuation phenomenon of the fault phase voltage is in different forms; in contrast, the robust phase voltage is not attenuated and remains substantially unchanged. And during the period of connecting the charging capacitor for the second time from 2.31s to 2.41s, the three-phase voltage is basically kept unchanged.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (3)

1. A method for self-adaptive three-phase reclosing of a single loop outgoing line of a wind power plant is characterized in that a substitute load is additionally arranged on the low-voltage side of a main transformer at the outlet of the wind power plant, and the substitute load is controlled by a load switch; a charging capacitor is additionally arranged on the side of a wind power plant of a transmission line of the wind power plant, the installation position is arranged on the inner side of a transmission line breaker, the charging capacitor is controlled by a capacitor switch, the charging capacitor is pre-charged by a direct-current power supply before being connected, and the charging capacitor is connected after the three-phase tripping of the transmission line; the using method comprises the following steps:
1) And inputting a substitute load after the three-phase tripping of the outgoing line of the wind power plant, wherein the substitute load is a variable resistor with the capacity P Rmax, and the size of the substitute load is set according to the difference between the annual average output P W of the wind power plant and the local annual average load P L, namely:
PRmax＝PW-PL (1)
After the three-phase tripping of the outgoing line of the wind power plant, if the transmission power P 0 of the outgoing line is not more than P Rmax before the fault, inputting an alternative load to maintain the stability of the wind power plant side, wherein the accessed alternative load capacity is as follows:
PR＝P0 (2)
If the transmission power P 0 of the outgoing line before the fault is greater than P Rmax, the maximum-capacity alternative load P R.max is thrown, and meanwhile, the alternative load capacity of partial fan capacity access with the wind power plant cut-off output of P WC is as follows:
PR＝PRmax＝P0-PWC (3)
2) Judging the reason of tripping of the circuit breaker, and if the reason is the stealing trip, quickly superposing and then gradually cutting off the alternative load; if the operation is manual, the lines are not overlapped, and the substitute load is cut off; otherwise, turning to 3);
3) Considering the circuit arc extinguishing time, the three-phase charging capacitor charged with different voltages is accessed in a delayed way for 0.5s, and the connection time delta t is 0.1 s;
4) Judging whether the line recovers a normal state or not based on the capacitance voltage value of each phase; during capacitor access, if the three-phase charging capacitor voltage, namely the three-phase voltage attenuation at the capacitor connection position does not exceed a setting value, the line fault is determined to be instantaneous and disappeared, namely:
In the formula (4), u X (t N) is each phase voltage of a capacitor access point during the access period of a charging capacitor, X is A, B, C, t N is the Nth access time of the capacitor, delta t is the time length of one detection, k is a setting value close to zero, after an oscillation circuit disappears, the voltage fluctuation is small, the k value is 3%, and if at least one phase of three-phase voltage is in an attenuation characteristic, the circuit is judged not to be recovered to be normal;
If the fault disappears, the lines are overlapped after the charging capacitor is cut off; if the circuit is not recovered to normal, the capacitance switch is disconnected, and each phase of capacitor is recharged for 0.2 s; return execution 3) -4);
5) And if the line is not recovered to be normal after 5 judgment periods, judging that the line has a permanent fault and is not overlapped, cutting off the substitute load, and stopping the operation of the wind power plant.
2. The method for the self-adaptive three-phase reclosing of the single loop back outgoing line of the wind power plant as claimed in claim 1, wherein the alternative load is an air-cooled resistor cabinet with capacity capable of being switched step by step.
3. the method for the self-adaptive three-phase reclosing of the single-loop outgoing line of the wind power plant according to claim 1, characterized in that the charging capacitor is a BMSJ1.14-15-3 type three-phase capacitor, and the direct current power supply is a BTK-12001 type high-voltage direct current stabilized power supply.
CN201611222877.0A 2016-12-27 2016-12-27 self-adaptive three-phase reclosing lock for single loop outgoing line of wind power plant and method thereof Expired - Fee Related CN106711925B (en)

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CN108390352B (en) * 2018-04-23 2019-09-03 新疆大学 A kind of wind-powered electricity generation submitting line fault nature examination method and system
CN112260236B (en) * 2020-09-17 2022-07-19 湘潭大学 Three-phase self-adaptive reclosing method and device
CN114079274B (en) * 2021-09-29 2023-08-22 华电电力科学研究院有限公司 Wind power plant current collection circuit reclosing method based on wireless differential protection
CN114465196B (en) * 2022-02-25 2024-07-09 南京理工大学 Line superposition method suitable for wind farm access power distribution network

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