CN111641224A - Direct current continuous commutation failure suppression method based on reactive self-adaptive regulation of photovoltaic power station - Google Patents

Direct current continuous commutation failure suppression method based on reactive self-adaptive regulation of photovoltaic power station Download PDF

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CN111641224A
CN111641224A CN202010642039.9A CN202010642039A CN111641224A CN 111641224 A CN111641224 A CN 111641224A CN 202010642039 A CN202010642039 A CN 202010642039A CN 111641224 A CN111641224 A CN 111641224A
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direct current
photovoltaic power
commutation failure
power station
reactive
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CN111641224B (en
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党杰
徐友平
王斌
李小平
汤奕
王莹
张三洪
潘晓杰
王玉坤
李春艳
张慕婕
段志远
王凯
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State Grid Jiangxi Electric Power Co ltd
Southeast University
Central China Grid Co Ltd
Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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State Grid Jiangxi Electric Power Co ltd
Southeast University
Central China Grid Co Ltd
Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention provides a direct current continuous commutation failure suppression method based on photovoltaic power station reactive self-adaptive adjustment for an alternating current-direct current interconnection system. According to the method, after a commutation failure fault occurs in a direct current system, reactive power output required by the photovoltaic power station is calculated by collecting running state data of the photovoltaic power station and the direct current system, adaptive adjustment of control parameters of the photovoltaic power station is carried out according to the reactive power output, dynamic reactive power requirements in the commutation failure recovery process of the direct current system are supported, and continuous commutation failure of the system is restrained. The method of the invention gives the reactive power output required by the photovoltaic power station by detecting the leading trigger angle of the direct current system, and provides dynamic reactive support for the system in the recovery process of the commutation failure of the direct current system, thereby inhibiting the occurrence of the continuous commutation failure of the system, being beneficial to improving the safety and stability of the alternating current-direct current interconnected system and having better engineering application value.

Description

Direct current continuous commutation failure suppression method based on reactive self-adaptive regulation of photovoltaic power station
Technical Field
The invention belongs to the technical field of electric power, relates to the field of direct current continuous commutation failure suppression strategy research, and particularly relates to a direct current continuous commutation failure suppression method based on reactive self-adaptive regulation of a photovoltaic power station.
Background
The high-voltage direct-current transmission is widely applied to the aspects of long-distance large-capacity transmission, large-area power grid interconnection, cross-sea gorge transmission and the like because the transmission distance of the high-voltage direct-current transmission is not limited by the stability of synchronous operation and the technical advantages of flexible and rapid transmission power regulation, and powerfully promotes the implementation of the energy development strategy of 'east-west transmission, mutual economy between south and north and national networking' in China. While solving the problem of energy transmission, the high-voltage direct-current transmission also introduces a series of problems, which pose challenges to the safe and stable operation of the power grid, and the failure due to commutation failure is the most typical and extensive failure.
The direct current commutation failure can cause power transmission loss, in the direct current commutation failure recovery process, the inverter station needs to absorb a large amount of reactive power from the alternating current system, so that the voltage of the converter station is further deteriorated, if the system cannot provide enough reactive power support, the direct current system can generate continuous commutation failure, and even direct current locking is caused in serious conditions, so that the safe and stable operation of a power grid is seriously damaged.
Disclosure of Invention
In order to solve the problems, the invention provides a direct current continuous commutation failure suppression method based on reactive self-adaptive regulation of a photovoltaic power station.
In order to achieve the purpose, the invention provides the following technical scheme:
a direct current continuous commutation failure suppression strategy based on reactive self-adaptive regulation of a photovoltaic power station comprises the following steps:
(1) monitoring the change of the converter valve blowout angle gamma of the direct current system in real time, and judging whether the direct current system has a commutation failure fault;
(2) if the system has a commutation failure fault, entering the step (3), otherwise, continuously returning to the step (1);
(3) collecting operation data of a direct current system and a photovoltaic power station;
(4) calculating reactive power output required by the photovoltaic power station based on the operation data collected in the step (3);
(5) and calculating adaptive photovoltaic power station control parameters, increasing the reactive power output of the photovoltaic power station, and inhibiting the occurrence of continuous commutation failure of the direct current system.
Further, the commutation failure fault in the step (1) is judged by the following method: comparing the converter valve extinction angle gamma with the inherent limit valve extinction angle gammaminIn the relationship between if gamma is less than or equal to gammaminThen a commutation failure fault is deemed to have occurred.
Further, the commutation failure fault is: when two valves of the converter carry out phase change, the valve which is out of conduction in the phase change process cannot recover the blocking capability in time under the action of reverse voltage, or the phase change process cannot be finished in the reverse voltage action period, so that the valve which is turned off is turned on again under the action of forward voltage.
Further, the operation data of the direct current system and the photovoltaic power station in the step (3) specifically includes: measured value U of photovoltaic power station grid-connected point voltage after dq conversiond,UqThe measured value i of the current of the photovoltaic power station after dq conversiond,iqThe photovoltaic output reactive power Q and the actual value U of the working voltage of the photovoltaic celldcpThe dc system inverter station triggers the lead angle β.
Further, the reactive power output required by the photovoltaic power station is calculated in the step (4), and the calculation is specifically realized by the following formula:
Qref＝Kp(β-βref)
wherein QrefRepresenting the calculated required reactive power output of the photovoltaic power plant, β representing the DC system inverter station trigger lead angle, βrefRepresenting the reference value of the firing angle, K, of the inverter station of the DC systempIs a scaling factor.
Further, the adaptive photovoltaic power station control parameter is calculated in the step (5), and is specifically realized by the following formula:
Figure BDA0002571848720000021
wherein idref,iqrefRespectively representing the reference values of active and reactive currents, kp,kiThe parameters of the PI controller can be adjusted according to actual conditions; u shapedcpThe actual value of the working voltage of the photovoltaic cell is obtained; u shapeprefRepresenting the photovoltaic cell reference voltage calculated by the maximum power tracking algorithm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method of the invention gives the reactive power output required by the photovoltaic power station by detecting the leading trigger angle of the direct current system, and provides dynamic reactive support for the system in the phase commutation failure recovery process of the direct current system, thereby inhibiting the occurrence of continuous phase commutation failure of the system and having better engineering application value.
Drawings
Fig. 1 is a schematic flow chart of a method for suppressing the continuous direct current commutation failure based on the reactive adaptive regulation of the photovoltaic power station.
Detailed Description
The technical solutions provided by the present invention will be described in detail below with reference to specific examples, and it should be understood that the following specific embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention.
The invention provides a direct current continuous commutation failure suppression method based on reactive self-adaptive regulation of a photovoltaic power station, the flow of which is shown in figure 1, and the method comprises the following steps:
step S1: monitoring the change of the converter valve blowout angle gamma of the direct current system in real time, and judging whether the direct current system has a commutation failure fault;
judging whether the direct current system has a commutation failure fault, and comparing the converter valve extinction angle gamma with the inherent limit extinction angle gammaminIn the relationship between if gamma is less than or equal to gammaminIf so, determining that a commutation failure fault occurs;
the commutation failure fault is described as: when two valves of the converter carry out phase change, the valve which is out of conduction in the phase change process cannot recover the blocking capability in time under the action of reverse voltage, or the phase change process cannot be finished in the reverse voltage action period, so that the valve which is turned off is turned on again under the action of forward voltage.
Step S2: if the system has a commutation failure fault, the method goes to step S3, otherwise, the method continues to return to step S1;
step S3: collecting operation data of a direct current system and a photovoltaic power station; the method specifically comprises the following steps: measured value U of photovoltaic power station grid-connected point voltage after dq conversiond,UqThe measured value i of the current of the photovoltaic power station after dq conversiond,iqThe photovoltaic output reactive power Q and the actual value U of the working voltage of the photovoltaic celldcpThe dc system inverter station triggers the lead angle β;
step S4: calculating the reactive power output required by the photovoltaic power station based on the operation data collected in the step S3; the method can be specifically realized according to the following formula:
Qref＝Kp(β-βref)
wherein QrefRepresenting the calculated required reactive power output of the photovoltaic power plant, β representing the DC system inverter station trigger lead angle, βrefRepresenting the reference value of the firing angle, K, of the inverter station of the DC systempThe scale factor is generally obtained by setting empirical parameters;
step S5: and calculating adaptive photovoltaic power station control parameters, increasing the reactive power output of the photovoltaic power station, and inhibiting the occurrence of continuous commutation failure of the direct current system.
The self-adaptive photovoltaic power station control parameters are calculated, and the calculation can be specifically realized through the following formula:
Figure BDA0002571848720000031
wherein idref,iqrefRespectively representing the reference values of active and reactive currents, kp,kiThe parameters of the PI controller can be adjusted according to actual conditions; u shapedcpThe actual value of the working voltage of the photovoltaic cell is obtained; u shapeprefRepresents the photovoltaic cell reference voltage calculated by the maximum power tracking algorithm (MTTP).
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims (6)

1. A direct current continuous commutation failure suppression strategy based on reactive self-adaptive regulation of a photovoltaic power station is characterized by comprising the following steps:
(1) monitoring the change of the converter valve blowout angle gamma of the direct current system in real time, and judging whether the direct current system has a commutation failure fault;
(2) if the system has a commutation failure fault, entering the step (3), otherwise, continuously returning to the step (1);
(3) collecting operation data of a direct current system and a photovoltaic power station;
(4) calculating reactive power output required by the photovoltaic power station based on the operation data collected in the step (3);
(5) and calculating adaptive photovoltaic power station control parameters, increasing the reactive power output of the photovoltaic power station, and inhibiting the occurrence of continuous commutation failure of the direct current system.
2. The photovoltaic power station reactive power adaptive regulation-based direct current continuous commutation failure suppression strategy is characterized in that the commutation failure fault in the step (1) is judged by the following method: comparing the converter valve extinction angle gamma with the inherent limit valve extinction angle gammaminIn the relationship between if gamma is less than or equal to gammaminThen a commutation failure fault is deemed to have occurred.
3. The photovoltaic power station reactive power adaptive adjustment-based direct current continuous commutation failure suppression strategy according to claim 1 or 2, wherein the commutation failure fault is: when two valves of the converter carry out phase change, the valve which is out of conduction in the phase change process cannot recover the blocking capability in time under the action of reverse voltage, or the phase change process cannot be finished in the reverse voltage action period, so that the valve which is turned off is turned on again under the action of forward voltage.
4. The photovoltaic power plant reactive power adaptive adjustment-based direct current continuous commutation failure suppression strategy according to claim 1, wherein the operation data of the direct current system and the photovoltaic power plant in the step (3) specifically include: measured value U of photovoltaic power station grid-connected point voltage after dq conversiond,UqThe measured value i of the current of the photovoltaic power station after dq conversiond,iqThe photovoltaic output reactive power Q and the actual value U of the working voltage of the photovoltaic celldcpThe dc system inverter station triggers the lead angle β.
5. The photovoltaic power station reactive power adaptive adjustment-based direct current continuous commutation failure suppression strategy according to claim 1, wherein the required reactive power output of the photovoltaic power station is calculated in the step (4), and is specifically realized by the following formula:
Qref＝Kp(β-βref)
wherein QrefRepresenting the calculated required reactive power output of the photovoltaic power plant, β representing the DC system inverter station trigger lead angle, βrefRepresenting the reference value of the firing angle, K, of the inverter station of the DC systempIs a scaling factor.
6. The photovoltaic power plant reactive power adaptive regulation-based direct current continuous commutation failure suppression strategy according to claim 1, wherein the adaptive photovoltaic power plant control parameters are calculated in the step (5), and are specifically realized by the following formula:
Figure FDA0002571848710000021
wherein idref,iqrefRespectively representing the reference values of active and reactive currents, kp,kiThe parameters of the PI controller can be adjusted according to actual conditions；UdcpThe actual value of the working voltage of the photovoltaic cell is obtained; u shapeprefRepresenting the photovoltaic cell reference voltage calculated by the maximum power tracking algorithm.
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Publication number Priority date Publication date Assignee Title
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CN111009916A (en) * 2019-12-04 2020-04-14 深圳供电局有限公司 Method for inhibiting direct current continuous commutation failure
CN111064220A (en) * 2019-12-09 2020-04-24 国网甘肃省电力公司 LCC-MMC three-terminal hybrid flexible renewable energy remote delivery method

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Publication number Priority date Publication date Assignee Title
KR101553765B1 (en) * 2014-02-10 2015-09-30 인천대학교 산학협력단 Method and system for preventing commutation failure in high-voltage direct current system
CN110417042A (en) * 2019-08-16 2019-11-05 国网山东省电力公司电力科学研究院 A kind of method of controlling security and system inhibiting the continuous commutation failure of direct current system
CN111009916A (en) * 2019-12-04 2020-04-14 深圳供电局有限公司 Method for inhibiting direct current continuous commutation failure
CN111064220A (en) * 2019-12-09 2020-04-24 国网甘肃省电力公司 LCC-MMC three-terminal hybrid flexible renewable energy remote delivery method

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