CN114221397A - Method and system for station-level voltage closed-loop control of new energy field - Google Patents

Method and system for station-level voltage closed-loop control of new energy field Download PDF

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Publication number
CN114221397A
CN114221397A CN202111083743.6A CN202111083743A CN114221397A CN 114221397 A CN114221397 A CN 114221397A CN 202111083743 A CN202111083743 A CN 202111083743A CN 114221397 A CN114221397 A CN 114221397A
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China
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voltage
new energy
energy station
generation unit
power generation
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Inventor
孙华东
李文锋
耿志晨
张健
艾东平
魏巍
王晖
贾媛
王小立
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Ningxia Electric Power Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Ningxia Electric Power Co Ltd
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Priority to CN202111083743.6A priority Critical patent/CN114221397A/en
Publication of CN114221397A publication Critical patent/CN114221397A/en
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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
    • H02J3/38—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
    • 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
    • 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
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • 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
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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

Abstract

The invention discloses a method and a system for station-level voltage closed-loop control of a new energy field, and belongs to the technical field of power systems. The method comprises the following steps: measuring the voltage of a grid-connected point of a new energy station and the voltage of a power generation unit in the new energy station, and reading the communication state of a new energy station controller and the power generation unit; judging whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and the given target voltage of the grid-connected point is greater than a voltage deviation dead zone or not; when the absolute value is larger than the voltage deviation dead zone, a reactive power control command is issued to a power generation unit; controlling the new energy station to enter a local level control mode of the converter controller according to the reactive control instruction, and obtaining IqcmdInstruction Iqcmd＝Iqcmd' of a compound of formula I; mixing IqcmdAnd sending the current to a converter controller for regulation. The wind power plant transient reactive power supporting capability of the wind power plant is improved when the grid-connected point of the wind power plant generates voltage transient sudden rise/sudden fall, and meanwhile, the short-circuit current capability of the wind power plant is improved.

Description

Method and system for station-level voltage closed-loop control of new energy field
Technical Field
The present invention relates to the field of power system technologies, and more particularly, to a method and a system for station-level voltage closed-loop control of a new energy farm.
Background
In 2017, the wind power installation reaches 1.54 hundred million kilowatts and the photovoltaic power generation installation reaches 1.02 hundred million kilowatts in China, and the total proportion of the wind power installation and the photovoltaic power generation installation accounts for more than 13 percent of the national power generation installation. Wherein, the new energy of 16 provincial power grids of Xinjiang, Qinghai, Ningxia, Jibei and the like becomes the second large installed power supply, and the proportion of the four provincial new energy installed machines of Xinjiang, Qinghai and the like in the total installed local power supply is more than 30%. It is predicted that the new energy ratio of some local power grids may reach 80% or even higher in the near future, and the ultrahigh-ratio new energy grid-connected operation will become an important characteristic of a future power supply structure.
However, as the proportion of new energy in the power grid is higher and higher, the range of influence of the new energy on the power grid is gradually enlarged from part to part. The output of the new energy unit has obvious intermittence and fluctuation, so that large-scale access of wind power and photovoltaic brings great pressure to stable operation of a local power grid, and large-scale chain off-grid accidents are caused frequently.
At present, main voltage regulation measures of a new energy station (wind power/photovoltaic) are realized through a static reactive power compensation device (such as SVG or SVC), but the static reactive power compensation device is realized through a power electronic device and has certain control delay, the dynamic response time of the SVG is generally about 30-50 ms, the dynamic response time of the TCR type SVC is generally about 100-200 ms, and the dynamic response time of the MCR type SVC can reach hundreds of milliseconds to seconds. When the voltage of the power system is disturbed or has faults, the voltage sudden increase/sudden decrease is caused, the static reactive compensation device can cause reactive reverse regulation to deteriorate the voltage stability level of the system, and the static reactive compensation device is suitable for steady-state voltage regulation but not suitable for transient rapid voltage control.
Therefore, how to actively and quickly support the frequency and voltage fluctuation of the power grid is a problem to be solved at present, while taking into consideration the realization of the steady-state voltage regulation of the power system, and providing a quick and correct reactive response in the voltage sudden change transient process.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for closed-loop control of new energy station level voltage, including:
measuring the voltage of a grid-connected point of a new energy station and the voltage of a power generation unit in the new energy station, and reading the communication state of a new energy station controller and the power generation unit;
if the communication state meets the preset requirement, judging whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and the given target voltage of the grid-connected point is greater than a voltage deviation dead zone or not;
when the absolute value is larger than the voltage deviation dead zone, controlling the new energy station to enter a new energy station level voltage closed-loop control mode, monitoring difference data of the voltage of a grid-connected point of the new energy station and target voltage, acquiring a reactive power control instruction according to the difference data, and sending the reactive power control instruction to a power generation unit;
determining whether the voltage of the power generation unit terminal meets a preset threshold value, and if so, controlling the new energy station to enter according to a reactive power control instructionThe converter controller is in a local control mode, and obtains a converter electrical control output instruction Iq in a normal operation state by performing PI correction on the reactive power difference valuecmd' order converter Final output Current instruction Iqcmd＝Iqcmd＇；
Mixing IqcmdAnd the signal is transmitted to a converter controller, and after dq-alpha beta inverse transformation, a converter switch driving signal is generated through space vector pulse width modulation for control and regulation.
Optionally, if the communication state does not meet the preset requirement, the new energy station is controlled to enter a local voltage closed-loop mode, the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station are measured again after the reactive power of the new energy station is adjusted, and the communication state of the new energy station controller and the power generation unit is read.
Optionally, when the absolute value is smaller than the voltage deviation dead zone, the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station are measured, and the communication state between the controller of the new energy station and the power generation unit is read.
Optionally, if the voltage at the power generation unit terminal does not meet the preset threshold, controlling the power generation unit to lock the reactive power control instruction, controlling the new energy station to enter a high-penetration or low-penetration control mode, and calculating IqHVRTOr IqLVRTThe calculation formula is as follows:
IqHVRT＝K1_Iq_HV*(VHin-Vt)+K2_Iq_HV*Iq0+Iqset_HV
IqLVRT＝K1_Iq_LV*(VLin-Vt)+K2_Iq_LV*Iq0+Iqset_LV
let Iqcmd＝IqHVRTOr Iqcmd＝IqLVRT；
In the above formula, K1_Iq_HVCalculating a coefficient 1 for the reactive current during high voltage/low voltage ride through; k2_Iq_HVCalculating a coefficient 2 for the reactive current during high voltage/low voltage ride through; iqset_HVCalculating a coefficient 3 for the reactive current during high voltage/low voltage ride through;Iq0is an initial reactive current; vtIs the terminal voltage amplitude; VLinGo to the high/low voltage crossing threshold.
Optionally, mixing IqcmdAfter the voltage difference value is sent to a converter controller to be adjusted, whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and a given target voltage of the grid-connected point is larger than a voltage deviation dead zone or not is determined, if the absolute value is larger than the voltage deviation dead zone, the new energy station is controlled to enter a new energy station level voltage closed-loop control mode, difference data of the new energy station grid-connected point voltage and the target voltage are monitored, a reactive control instruction is obtained according to the difference data, and the reactive control instruction is sent to a power generation unit;
and if the voltage is smaller than the preset value, measuring the voltage of the grid-connected point of the new energy station and the voltage of the power generation unit end in the new energy station, and reading the communication state of the new energy station controller and the power generation unit.
Optionally, the preset threshold is 0.7pu to 1.3 pu.
The invention also provides a system for the station-level voltage closed-loop control of the new energy field, which comprises the following steps:
the measuring unit is used for measuring the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station and reading the communication state of the new energy station controller and the power generation unit;
the judging unit is used for judging whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and the given target voltage of the grid-connected point is greater than the voltage deviation dead zone or not if the communication state meets the preset requirement;
the first instruction issuing unit is used for controlling the new energy station to enter a new energy station level voltage closed-loop control mode when the absolute value is greater than the voltage and the voltage deviation dead zone, monitoring the new energy station and the difference data of the network point voltage and the target voltage, acquiring a reactive power control instruction according to the difference data, and issuing a reactive power control instruction to the power generation unit;
the second instruction issuing unit is used for determining whether the voltage of the terminal of the power generation unit meets a preset threshold value, if so, controlling the new energy station to enter a local level control mode of the converter controller according to the reactive power control instruction, and controlling the new energy station to enter a non-reactive power control modePerforming PI correction on the power difference value to obtain a converter electrical control output instruction Iq in a normal operation statecmd' order converter Final output Current Command Iqcmd＝Iqcmd＇；
An adjusting unit for adjusting IqcmdAnd the signal is transmitted to a converter controller, and after dq-alpha beta inverse transformation, a converter switch driving signal is generated through space vector pulse width modulation for control and regulation.
Optionally, if the communication state does not meet the preset requirement, the new energy station is controlled to enter a local voltage closed-loop mode, the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station are measured again after the reactive power of the new energy station is adjusted, and the communication state of the new energy station controller and the power generation unit is read.
Optionally, when the absolute value is smaller than the voltage deviation dead zone, the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station are measured, and the communication state between the controller of the new energy station and the power generation unit is read.
Optionally, if the voltage at the power generation unit terminal does not meet the preset threshold, controlling the power generation unit to lock the reactive power control instruction, controlling the new energy station to enter a high-penetration or low-penetration control mode, and calculating IqHVRTOr IqLVRTThe calculation formula is as follows:
IqHVRT＝K1_Iq_HV*(VHin-Vt)+K2_Iq_HV*Iq0+Iqset_HV
IqLVRT＝K1_Iq_LV*(VLin-Vt)+K2_Iq_LV*Iq0+Iqset_LV
let Iqcmd＝IqHVRTOr Iqcmd＝IqLVRT；
In the above formula, K1_Iq_HVCalculating a coefficient 1 for the reactive current during high voltage/low voltage ride through; k2_Iq_HVCalculating a coefficient 2 for the reactive current during high voltage/low voltage ride through; iqset_HVCalculating a coefficient 3 for the reactive current during high voltage/low voltage ride through; iq0Is an initial reactive current; vtIs the terminal voltage amplitude; VLinGo to the high/low voltage crossing threshold.
Optionally, mixing IqcmdAfter the voltage difference value is sent to a converter controller to be adjusted, whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and a given target voltage of the grid-connected point is larger than a voltage deviation dead zone or not is determined, if the absolute value is larger than the voltage deviation dead zone, the new energy station is controlled to enter a new energy station level voltage closed-loop control mode, difference data of the new energy station grid-connected point voltage and the target voltage are monitored, a reactive control instruction is obtained according to the difference data, and the reactive control instruction is sent to a power generation unit;
and if the voltage is smaller than the preset value, measuring the voltage of the grid-connected point of the new energy station and the voltage of the power generation unit end in the new energy station, and reading the communication state of the new energy station controller and the power generation unit.
Optionally, the preset threshold is 0.7pu to 1.3 pu.
The method can coordinate reactive power distribution between the SVG and the synchronous adjusting camera when the grid-connected point of the wind power plant generates voltage transient sudden rise/sudden fall, improves the transient reactive power supporting capability of the wind power plant when the grid-connected point of the wind power plant generates voltage transient sudden rise/sudden fall, and simultaneously improves the short-circuit current capability of the wind power plant.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of an embodiment of the method of the present invention;
FIG. 3 is a control diagram of the voltage closed loop control mode of the method embodiment of the present invention;
FIG. 4 is a control diagram of the local level control mode of an embodiment of the method of the present invention;
fig. 5 is a block diagram of the system of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for station-level voltage closed-loop control of a new energy field, as shown in fig. 1, comprising the following steps:
measuring the voltage of a grid-connected point of a new energy station and the voltage of a power generation unit in the new energy station, and reading the communication state of a new energy station controller and the power generation unit;
if the communication state meets the preset requirement, judging whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and the given target voltage of the grid-connected point is greater than a voltage deviation dead zone or not;
when the absolute value is larger than the voltage deviation dead zone, controlling the new energy station to enter a new energy station level voltage closed-loop control mode, monitoring difference data of the voltage of a grid-connected point of the new energy station and target voltage, acquiring a reactive power control instruction according to the difference data, and sending the reactive power control instruction to a power generation unit;
determining whether the voltage of the power generation unit terminal meets a preset threshold value, if so, controlling the new energy station to enter a local level control mode of a converter controller according to a reactive power control instruction, and performing PI correction on a reactive power difference value to obtain a converter electrical control output instruction Iq in a normal operation statecmd' order converter Final output Current instruction Iqcmd＝Iqcmd＇；
Mixing IqcmdAnd the signal is transmitted to a converter controller, and after dq-alpha beta inverse transformation, a converter switch driving signal is generated through space vector pulse width modulation for control and regulation.
The invention is further illustrated by the following examples:
the steps are shown in fig. 2, and include:
(1) measuring voltage U of Point of Common Coupling (PCC) of new energy stationTTerminal voltage U of each power generation unit in the stationtermReading the communication state of the new energy field controller and each power generation unit in the field, if the communication state is good, entering the step (3), otherwise, entering the step (2);
(2) the SVG enters a local voltage closed-loop mode and is connected with a point voltage U according to the new energy stationTAdjusting the emitted reactive power, and then returning to the step (1);
(3) judging and measuring the voltage U of the grid-connected point of the new energy stationTWith a given target voltage Uplant_refAbsolute value of difference | Uplant_ref-UTWhether | is greater than voltage deviation dead zone UpdbIs greater than UpdbGo to step (4), if less than UpdbReturning to the step (1);
(4) entering a new energy field station level voltage closed-loop control mode, and tracking and monitoring the voltage U of the PCC point by the reactive voltage control moduleTDifference from a given reference voltage and deriving Q from the differenceordThe control command and regulation mode is shown in FIG. 3, wherein TfltrFor measuring the time constant of the filtering element, Kp_pvAnd Ki_pvThe station level controller PI parameter is obtained;
(5) station level reactive power instruction Q through high-speed communication such as GOOSEordSending the power generation unit to each power generation unit;
(6) judging the voltage U of each power generation unit terminal in the station obtained by measurementtermWhether it is between 0.7pu and 1.3pu, if it is between 0.7pu and 1.3pu, step (7) is entered, and if it is not between 0.7pu and 1.3pu, step (8) is entered;
(7) q received by the power generation unitordThe control command is issued to the converter controller for adjustment, and the adjustment mode is as shown in fig. 4, where T isfltrFor measuring the time constant of the filtering element, TqordIs QordTime delay of control command issue, Kp_lqvAnd Ki_lqvControlling the PI parameter, K, for the outer loopp_lvAnd Ki_lvControlling PI parameter for current inner loop to obtain IqcmdInstruction Iqcmd＝Iqcmd＇；
(8) Locking the Q received by the power generation unit and issued by the station voltage regulation controllerordControl command, enter high-penetration or low-penetration control mode to calculate IqHVRTOr IqLVRTThe calculation method is as follows:
IqHVRT＝K1_Iq_HV*(VHin-Vt)+K2_Iq_HV*Iq0+Iqset_HV
IqLVRT＝K1_Iq_LV*(VLin-Vt)+K2_Iq_LV*Iq0+Iqset_LV
enabling Iq according to the entering high-penetration or low-penetration control modecmd＝IqHVRTOr Iqcmd＝IqLVRT；
(9) Mixing IqcmdSending the current to a converter for regulation;
(10) judging new energy station grid-connected point voltage U at the momentTWith a given target voltage Uplant_refAbsolute value of difference | Uplant_ref-UTWhether | is greater than voltage deviation dead zone UpdbIf greater than, go to step (4), if less than UpdbAnd (4) returning to the step (1).
The present invention further provides a system 200 for station-level voltage closed-loop control of a new energy farm, as shown in fig. 5, including:
the measuring unit 201 is used for measuring the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station and reading the communication state of a new energy station controller and the power generation unit;
the judging unit 202 is used for judging whether the absolute value of the difference value between the grid-connected point voltage of the new energy field station and the given target voltage of the grid-connected point is greater than the voltage deviation dead zone or not if the communication state meets the preset requirement;
the first instruction issuing unit 203 controls the new energy station to enter a new energy station level voltage closed-loop control mode when the absolute value is greater than the voltage and the voltage deviation dead zone, monitors difference data of the voltage of a grid-connected point of the new energy station and target voltage, acquires a reactive control instruction according to the difference data, and issues the reactive control instruction to the power generation unit;
the second instruction issuing unit 204 determines whether the voltage at the power generation unit terminal meets a preset threshold value, if so, controls the new energy station to enter a local level control mode of the converter controller according to the reactive power control instruction, and obtains a converter electrical control output instruction Iq in a normal operation state by performing PI correction on a reactive power difference valuecmd' order converter Final output Current Command Iqcmd＝Iqcmd＇；
An adjusting unit 205 for adjusting IqcmdAnd the signal is transmitted to a converter controller, and after dq-alpha beta inverse transformation, a converter switch driving signal is generated through space vector pulse width modulation for control and regulation.
If the communication state does not meet the preset requirement, the new energy station is controlled to enter a local voltage closed-loop mode, the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station are measured again after the reactive power of the new energy station is adjusted, and the communication state of the new energy station controller and the power generation unit is read.
When the absolute value is smaller than the voltage deviation dead zone, measuring the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station, and reading the communication state of a controller and the power generation unit of the new energy station.
If the voltage at the power generation unit does not meet the preset threshold value, the power generation unit is controlled to lock the reactive control instruction, the new energy station is controlled to enter a high-penetration or low-penetration control mode, and Iq is calculatedHVRTOr IqLVRTThe calculation formula is as follows:
IqHVRT＝K1_Iq_HV*(VHin-Vt)+K2_Iq_HV*Iq0+Iqset_HV
IqLVRT＝K1_Iq_LV*(VLin-Vt)+K2_Iq_LV*Iq0+Iqset_LV
let Iqcmd＝IqHVRTOr Iqcmd＝IqLVRT；
In the above formula, K1_Iq_HVCalculating a coefficient 1 for the reactive current during high voltage/low voltage ride through; k2_Iq_HVCalculating a coefficient 2 for the reactive current during high voltage/low voltage ride through; iqset_HVCalculating a coefficient 3 for the reactive current during high voltage/low voltage ride through; iq0Is an initial reactive current; vtIs the terminal voltage amplitude; VLinGo to the high/low voltage crossing threshold.
Wherein Iq iscmdAfter the voltage difference value is sent to a converter controller to be adjusted, whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and a given target voltage of the grid-connected point is larger than a voltage deviation dead zone or not is determined, if the absolute value is larger than the voltage deviation dead zone, the new energy station is controlled to enter a new energy station level voltage closed-loop control mode, difference data of the grid-connected point voltage and the target voltage of the new energy station is monitored, a reactive control instruction is obtained according to the difference data, and the reactive control instruction is sent to a power generation unit;
and if the voltage is smaller than the preset value, measuring the voltage of the grid-connected point of the new energy station and the voltage of the power generation unit end in the new energy station, and reading the communication state of the new energy station controller and the power generation unit.
Wherein the preset threshold is 0.7pu to 1.3 pu.
The method can coordinate reactive power distribution between the SVG and the synchronous adjusting camera when the grid-connected point of the wind power plant generates voltage transient sudden rise/sudden fall, improves the transient reactive power supporting capability of the wind power plant when the grid-connected point of the wind power plant generates voltage transient sudden rise/sudden fall, and simultaneously improves the short-circuit current capability of the wind power plant.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, it is intended that the present invention also encompass such modifications and variations.

Claims (12)

1. A method for new energy plant level voltage closed loop control, the method comprising:
measuring the voltage of a grid-connected point of a new energy station and the voltage of a power generation unit in the new energy station, and reading the communication state of a new energy station controller and the power generation unit;
if the communication state meets the preset requirement, judging whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and the given target voltage of the grid-connected point is greater than a voltage deviation dead zone or not;
when the absolute value is larger than the voltage deviation dead zone, controlling the new energy station to enter a new energy station level voltage closed-loop control mode, monitoring difference data of the voltage of a grid-connected point of the new energy station and target voltage, acquiring a reactive power control instruction according to the difference data, and sending the reactive power control instruction to a power generation unit;
determining whether the voltage of the power generation unit terminal meets a preset threshold value, if so, controlling the new energy station to enter a local level control mode of a converter controller according to a reactive power control instruction, and performing PI correction on a reactive power difference value to obtain a converter electrical control output instruction Iq in a normal operation statecmd' order converter Final output Current Command Iqcmd＝Iqcmd＇；
Mixing IqcmdAnd the signal is transmitted to a converter controller, and after dq-alpha beta inverse transformation, a converter switch driving signal is generated through space vector pulse width modulation for control and regulation.
2. The method as claimed in claim 1, wherein if the communication status does not meet the preset requirement, the new energy station is controlled to enter a local voltage closed loop mode, and after the reactive power of the new energy station is adjusted, the grid-connected point voltage of the new energy station and the terminal voltage of the power generation unit in the new energy station are measured again, and the communication status between the new energy station controller and the power generation unit is read.
3. The method as claimed in claim 1, wherein when the absolute value is smaller than the voltage deviation dead zone, measuring the voltage of a grid-connected point of the new energy field station and the voltage of a power generation unit in the new energy field station, and reading the communication state of the new energy field controller and the power generation unit.
4. The method as claimed in claim 1, wherein if the voltage at the terminal of the power generation unit does not meet the preset threshold, the power generation unit is controlled to block the reactive power control command, the new energy station is controlled to enter a high-penetration or low-penetration control mode, and Iq is calculatedHVRTOr IqLVRTThe calculation formula is as follows:
IqHVRT＝K1_Iq_HV*(VHin-Vt)+K2_Iq_HV*Iq0+Iqset_HV
IqLVRT＝K1_Iq_LV*(VLin-Vt)+K2_Iq_LV*Iq0+Iqset_LV
let Iqcmd＝IqHVRTOr Iqcmd＝IqLVRT；
In the above formula, K1_Iq_HVCalculating a coefficient 1 for the reactive current during high voltage/low voltage ride through; k2_Iq_HVCalculating a coefficient 2 for the reactive current during high voltage/low voltage ride through; iqset_HVCalculating a coefficient 3 for the reactive current during high voltage/low voltage ride through; iq0Is an initial reactive current; vtIs the terminal voltage amplitude; VLinGo to the high/low voltage crossing threshold.
5. The method of claim 1, the converting IqcmdAfter the difference value is sent to a converter controller for regulation, the difference value between the grid-connected point voltage of the new energy station and the given target voltage of the grid-connected point is determinedIf the absolute value of the voltage difference is larger than the voltage deviation dead zone, controlling the new energy station to enter a new energy station level voltage closed-loop control mode, monitoring difference data of a grid-connected point voltage and a target voltage of the new energy station, acquiring a reactive power control command according to the difference data, and sending the reactive power control command to a power generation unit;
and if the voltage is smaller than the preset value, measuring the voltage of a grid-connected point of the new energy station and the voltage of the power generation unit in the new energy station, and reading the communication state of the new energy station controller and the power generation unit.
6. The method according to claim 1, wherein the preset threshold is 0.7pu to 1.3 pu.
7. A system for new energy plant level voltage closed loop control, the system comprising:
the measuring unit is used for measuring the voltage of a grid-connected point of the new energy station and the voltage of a power generation unit in the new energy station and reading the communication state of the new energy station controller and the power generation unit;
the judging unit is used for judging whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and the given target voltage of the grid-connected point is greater than the voltage deviation dead zone or not if the communication state meets the preset requirement;
the first instruction issuing unit is used for controlling the new energy station to enter a new energy station level voltage closed-loop control mode when the absolute value is greater than the voltage and the voltage deviation dead zone, monitoring difference data of the voltage of a grid-connected point of the new energy station and target voltage, acquiring a reactive power control instruction according to the difference data, and issuing the reactive power control instruction to the power generation unit;
the second instruction issuing unit is used for determining whether the voltage at the terminal of the power generation unit meets a preset threshold value, if so, controlling the new energy station to enter a local level control mode of the converter controller according to the reactive power control instruction, and performing PI correction on the reactive power difference value to obtain an electric control output instruction Iq of the converter in a normal operation statecmd' order converter Final output Current Command Iqcmd＝Iqcmd＇；
RegulatingUnit of IqcmdAnd the signal is transmitted to a converter controller, and after dq-alpha beta inverse transformation, a converter switch driving signal is generated through space vector pulse width modulation for control and regulation.
8. The method as claimed in claim 1, wherein if the communication status does not meet the preset requirement, the new energy station is controlled to enter a local voltage closed loop mode, and after the reactive power of the new energy station is adjusted, the grid-connected point voltage of the new energy station and the terminal voltage of the power generation unit in the new energy station are measured again, and the communication status between the new energy station controller and the power generation unit is read.
9. The method as claimed in claim 1, wherein when the absolute value is smaller than the voltage deviation dead zone, measuring the voltage of a grid-connected point of the new energy field station and the voltage of a power generation unit in the new energy field station, and reading the communication state of the new energy field controller and the power generation unit.
10. The method as claimed in claim 1, wherein if the voltage at the terminal of the power generation unit does not meet the preset threshold, the power generation unit is controlled to block the reactive power control command, the new energy station is controlled to enter a high-penetration or low-penetration control mode, and Iq is calculatedHVRTOr IqLVRTThe calculation formula is as follows:
IqHVRT＝K1_Iq_HV*(VHin-Vt)+K2_Iq_HV*Iq0+Iqset_HV
IqLVRT＝K1_Iq_LV*(VLin-Vt)+K2_Iq_LV*Iq0+Iqset_LV
let Iqcmd＝IqHVRTOr Iqcmd＝IqLVRT；
In the above formula, K1_Iq_HVCalculating a coefficient 1 for the reactive current during high voltage/low voltage ride through; k2_Iq_HVCalculating a coefficient 2 for the reactive current during high voltage/low voltage ride through; iqset_HVCalculating a coefficient 3 for the reactive current during high voltage/low voltage ride through; iq0Is an initial reactive current;Vtis the terminal voltage amplitude; VLinGo to the high/low voltage crossing threshold.
11. The method of claim 1, the converting IqcmdAfter the voltage difference value is sent to a converter controller to be adjusted, whether the absolute value of the difference value between the grid-connected point voltage of the new energy station and a given target voltage of the grid-connected point is larger than a voltage deviation dead zone or not is determined, if the absolute value is larger than the voltage deviation dead zone, the new energy station is controlled to enter a new energy station level voltage closed-loop control mode, difference data of the new energy station grid-connected point voltage and the target voltage are monitored, a reactive power control command is obtained according to the difference data, and the reactive power control command is sent to a power generation unit;
and if the voltage is smaller than the preset value, measuring the voltage of a grid-connected point of the new energy station and the voltage of the power generation unit in the new energy station, and reading the communication state of the new energy station controller and the power generation unit.
12. The method according to claim 1, wherein the preset threshold is 0.7pu to 1.3 pu.
CN202111083743.6A 2021-09-14 2021-09-14 Method and system for station-level voltage closed-loop control of new energy field Pending CN114221397A (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN109245317A (en) * 2017-07-11 2019-01-18 中国电力科学研究院 A kind of electromechanical transient simulation system and method for battery energy storage system
CN109390952A (en) * 2018-11-08 2019-02-26 中国电力科学研究院有限公司 A kind of Wind turbines wide area quick voltage controller and control method
CN112421671A (en) * 2019-08-20 2021-02-26 中国电力科学研究院有限公司 Photovoltaic power station power control method and system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109245317A (en) * 2017-07-11 2019-01-18 中国电力科学研究院 A kind of electromechanical transient simulation system and method for battery energy storage system
CN109390952A (en) * 2018-11-08 2019-02-26 中国电力科学研究院有限公司 A kind of Wind turbines wide area quick voltage controller and control method
CN112421671A (en) * 2019-08-20 2021-02-26 中国电力科学研究院有限公司 Photovoltaic power station power control method and system

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