WO2019076028A1 - Converter, method and device for controlling high voltage ride through of converter - Google Patents

Converter, method and device for controlling high voltage ride through of converter Download PDF

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Publication number
WO2019076028A1
WO2019076028A1 PCT/CN2018/085823 CN2018085823W WO2019076028A1 WO 2019076028 A1 WO2019076028 A1 WO 2019076028A1 CN 2018085823 W CN2018085823 W CN 2018085823W WO 2019076028 A1 WO2019076028 A1 WO 2019076028A1
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WIPO (PCT)
Prior art keywords
converter
voltage
high voltage
grid
current
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PCT/CN2018/085823
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French (fr)
Chinese (zh)
Inventor
武磊
杨志千
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新疆金风科技股份有限公司
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Publication of WO2019076028A1 publication Critical patent/WO2019076028A1/en

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    • H02J3/386—
    • 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
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • 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]
    • 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
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • the invention relates to the technical field of wind power generation, in particular to a converter and a high voltage ride through control method and device for a wind power generator.
  • the reactive current is used to form a voltage drop across the grid impedance to reduce the requirement for raising the DC bus voltage.
  • the invention provides a high voltage ride through control method and device for a converter and a converter of a wind power generator, and a reactive current given method for a high voltage ride through mode of a converter and a corresponding high thereof are given.
  • the voltage traversal control strategy allows the wind turbine to have a high voltage ride through function.
  • an embodiment of the present invention provides a high voltage ride through control method for a current transformer, where the high voltage ride through control method includes:
  • the calculation needs to be provided to the reactor according to the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter. Reactive current reference; and
  • the reactive current is supplied to the reactor.
  • the reactive current setpoint to be provided to the reactor is calculated based on the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter.
  • Iq is the reactive current set value
  • Udc Max is the highest working voltage of the DC bus
  • Kr is the voltage utilization of the DC bus.
  • the vector magnitude of the positive voltage component of the grid voltage, ⁇ is the angular velocity of the grid voltage, and L is the inductive reactance of the reactor.
  • the current operating state of the converter is determined based on the grid voltage and the rated voltage of the converter, including:
  • Vector magnitude of the positive sequence component of the grid voltage Perform low-pass filtering to obtain the filtered vector magnitude of the positive sequence component of the grid voltage as well as
  • determine the current operating state of the converter including:
  • the high voltage ride through control method further includes:
  • the brake circuit of the converter is started.
  • the high voltage ride through control method further includes:
  • control active current margin is incremented from the current value until the maximum operating current of the converter is reached; or / and
  • the reactive output power of the control converter is restored to the initial value, and is incremented from the initial value until the reactive power demand value of the converter is reached.
  • an embodiment of the present invention provides a high voltage ride through control device for a converter, where the high voltage ride through control device includes:
  • a voltage monitoring unit configured to monitor a grid voltage at a side of the converter network
  • a determining unit configured to determine a current operating state of the converter according to the grid voltage and the rated voltage of the converter
  • the calculating unit is configured to determine, according to the voltage characteristic of the DC bus of the converter, the voltage characteristic of the power grid, and the inductive reactance value of the reactor of the converter, if it is determined that the current operating state of the converter is to enter the high voltage ride through mode. Calculate the reactive current setpoint that needs to be supplied to the reactor;
  • the control unit is configured to provide a reactive current to the reactor according to the reactive current reference value.
  • the computing unit is further configured to calculate the reactive current reference using the following formula:
  • Ip is the reactive current setpoint
  • Udc Max is the highest operating voltage of the DC bus
  • Kr is the voltage utilization of the DC bus.
  • the vector magnitude of the positive voltage component of the grid voltage, ⁇ is the angular velocity of the grid voltage, and L is the inductive reactance of the reactor.
  • the determining unit comprises:
  • Extracting a subunit configured to extract a positive sequence component of the grid voltage and calculate a vector magnitude of the positive sequence component of the grid voltage
  • Filter subunit configured as a vector magnitude of the positive sequence component of the grid voltage Perform low-pass filtering to obtain the filtered vector magnitude of the positive sequence component of the grid voltage as well as
  • a decision subunit configured to be based on Determine the current operating state of the converter with the rated voltage of the converter.
  • the determining subunit is further configured to multiply the rated voltage of the converter by a predetermined upper limit factor to obtain a first voltage threshold, multiplying the rated voltage of the converter by a predetermined lower limit factor, Second voltage threshold; if If it is greater than the first voltage threshold and reaches the first specified time, it is determined that the converter enters a high voltage ride through mode; If it is less than the second voltage threshold and reaches the second specified time, it is determined that the converter exits the high voltage ride through mode.
  • the computing unit is further configured to calculate an active current margin of the converter that is allowed to be incorporated into the grid based on the reactive current setpoint; the control unit is further configured to When the active current capacity is greater than the active current margin, the brake circuit of the converter is started.
  • control unit is further configured to: if the converter is determined to exit the high voltage ride through mode, control the active current margin to increase from the current value until the maximum operating current of the converter is reached; or / and if it is determined that the converter exits the high voltage ride through mode, the reactive output power of the control converter is restored to the initial value, and is incremented from the initial value until the reactive power demand value of the converter is reached.
  • an embodiment of the present invention provides a converter for a wind power generator, the converter including a high voltage ride through control device of the current transformer as described above.
  • the high voltage ride through control method of the converter of the embodiment of the invention can determine the current working state of the converter according to the grid voltage at the side of the converter network and the rated voltage of the converter. If it is determined that the current working state of the converter is to enter the high voltage ride-through mode, the calculation may be provided to the reactor according to the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter. The reactive current is given a value, and then the reactive current is supplied to the reactor according to the reactive current set value.
  • the high voltage ride through control method of the converter of the embodiment of the present invention calculates the reactive current set value, the voltage characteristics of the DC bus, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter are considered.
  • the calculated reactive current setpoint can be matched with the DC bus, the grid and the reactor, so that the reactor consumes the voltage drop corresponding to the reactive current, which can be caused by the grid impact during the high-voltage crossing of the converter.
  • the rise of the DC bus voltage is offset, which in turn allows the wind turbine to have a high voltage ride through function.
  • the high voltage ride through control method of the converter in the embodiment of the present invention calculates the reactive current set value, the voltage characteristics of the DC bus, the voltage characteristics of the power grid, and the inductive reactance of the reactor of the converter are considered.
  • the value can therefore be applied to the high voltage ride through standard requirements of different grids, thus avoiding the hardware modification of the wind turbine converter and saving costs.
  • the high voltage ride through control method of the converter in the embodiment of the invention can respond to high voltage traversing requirements in time under low operating conditions of low voltage traversing and high voltage traversing, avoiding wind turbines and their converters. Damaged by high voltage crossing conditions.
  • FIG. 1 is a schematic flow chart of a high voltage ride through control method for a converter according to an embodiment of the present invention
  • FIG. 2 is a schematic flow chart of a high voltage ride through control method of a converter according to another embodiment of the present invention.
  • FIG. 3 is a schematic flow chart of a high voltage ride through control method for a converter according to another embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a high voltage ride through control device for a converter according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a high voltage ride through control device for a converter according to another embodiment of the present invention.
  • the embodiment of the invention provides a high voltage ride through control method and device for a converter and a converter of a wind power generator, and a reactive current given method for a high voltage ride through mode of the converter and corresponding
  • the high voltage ride-through control strategy allows the wind turbine to have a high voltage ride through function.
  • FIG. 1 is a schematic flow chart of a high voltage ride through control method for a converter according to an embodiment of the present invention. As shown in FIG. 1, the high voltage ride through control method of the converter includes steps 101 to 104.
  • step 101 the grid voltage at the side of the converter network is monitored.
  • step 102 the current operating state of the converter is determined based on the grid voltage and the rated voltage of the converter.
  • step 103 if it is determined that the current operating state of the converter is to enter the high voltage ride-through mode, the voltage characteristic of the DC bus of the converter, the voltage characteristic of the power grid, and the inductive reactance value of the reactor of the converter are calculated. Reactive current reference to the reactor is required.
  • the reactive current reference can be calculated using the following formula:
  • Iq is the reactive current set value
  • Udc Max is the highest working voltage of the DC bus
  • Kr is the voltage utilization of the DC bus.
  • the vector magnitude of the positive voltage component of the grid voltage, ⁇ is the angular velocity of the grid voltage, and L is the inductive reactance of the reactor.
  • step 104 a reactive current is supplied to the reactor according to the reactive current set value.
  • the grid voltage at the side of the converter network can be monitored, and the current operating state of the converter can be determined according to the grid voltage and the rated voltage of the converter. If it is determined that the current working state of the converter is to enter the high voltage ride-through mode, the calculation may be provided to the reactor according to the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter. The reactive current is given a value, and then the reactive current is supplied to the reactor according to the reactive current reference value.
  • the high voltage ride through control method of the converter of the embodiment of the present invention calculates the reactive current set value, the voltage characteristics of the DC bus, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter are considered.
  • the calculated reactive current setpoint can be matched with the DC bus, the grid and the reactor, so that the voltage drop formed by the reactor corresponding to the reactive current can be compared with the DC caused by the converter during the high voltage crossing process.
  • the rise of the bus voltage is offset, which in turn allows the wind turbine to have a high voltage ride through function.
  • the high voltage ride through control method of the converter in the embodiment of the present invention calculates the reactive current set value, the voltage characteristics of the DC bus, the voltage characteristics of the power grid, and the inductive reactance of the reactor of the converter are considered.
  • the value can therefore be adapted to the high voltage ride through standard requirements of different grids, thus avoiding hardware modifications to the wind turbine converter and saving costs.
  • the high voltage ride through control method of the converter in the embodiment of the invention can respond to high voltage traversing requirements in time under low operating conditions of low voltage traversing and high voltage traversing, avoiding wind turbines and their converters. Damaged by high voltage crossing conditions.
  • FIG. 2 is a schematic flow chart of a high voltage ride through control method for a converter according to another embodiment of the present invention. 2 is different from FIG. 1 in that step 102 in FIG. 1 can be refined into steps 1021 to 1024 in FIG.
  • step 1021 a positive sequence component of the grid voltage is extracted.
  • step 1022 calculating the vector magnitude of the positive sequence component of the grid voltage
  • step 1023 the vector magnitude of the positive sequence component of the grid voltage Perform low-pass filtering to improve the accuracy of the grid voltage and obtain the vector magnitude after filtering of the positive sequence component of the grid voltage
  • step 1024 according to Determine the current operating state of the converter with the rated voltage of the converter.
  • the rated voltage of the converter may be multiplied by a predetermined upper limit factor to obtain a first voltage threshold, and the rated voltage of the converter is multiplied by a predetermined lower limit factor to obtain a second voltage threshold. If If it is greater than the first voltage threshold and reaches the first specified time, it is determined that the converter enters a high voltage ride through mode; If it is less than the second voltage threshold and reaches the second specified time, it is determined that the converter exits the high voltage ride through mode.
  • the predetermined upper limit factor may be 1.1 and the first duration may be 10 ms. If When the rated voltage is greater than 1.1 times and lasts for 10 ms, it is determined that the converter enters a high voltage ride through mode, that is, a high voltage ride through state is enabled.
  • the predetermined lower limit factor may be 1.09 and the first duration may also be 10 ms. If With a rated voltage less than 1.09 times and lasting 10 ms, it is determined that the converter enters a low voltage ride through mode, that is, a low voltage ride through state is enabled.
  • the predetermined lower limit factor is less than the predetermined upper limit factor, and the first duration and the second duration may be equal or unequal.
  • a person skilled in the art can set a predetermined upper limit factor, a predetermined lower limit factor, a first duration and a second duration according to actual operating data of the wind turbine, and no limitation is made here.
  • FIG. 3 is a schematic flow chart of a high voltage ride through control method for a converter according to another embodiment of the present invention. 3 differs from FIG. 1 in that, after step 104 in FIG. 1, the high voltage ride through control method of the converter includes steps 105 and 106 in FIG.
  • step 105 the active current margin of the converter that is allowed to be incorporated into the grid is calculated based on the reactive current setpoint.
  • the active current margin can be calculated using the following formula:
  • Ip is the active current margin
  • I Max is the maximum operating current of the converter
  • Iq is the reactive current setpoint
  • step 106 if the active current capacity of the converter is greater than the active current margin, the brake circuit of the converter can be activated to consume the active power that cannot be connected to the Internet, and reduce the active power that is integrated into the grid, so that the wind turbine Can pass the high voltage crossing state smoothly.
  • the active current margin can be controlled to increase from the current value until the maximum operating current of the converter is reached. That is, after the grid voltage returns to normal, the active current limit starts to climb from the current value, so that the converter completes the transition from the high voltage crossing state to the normal working state.
  • the reactive output power of the converter can be controlled to return to the initial value, and the increment is started from the initial value until the variable current is reached.
  • the reactive power demand value of the device That is, after the grid voltage returns to normal, the reactive power starts to climb from the unit power factor to the reactive power demand value, so that the converter completes the transition from the high voltage crossing state to the normal working state.
  • FIG. 4 is a schematic structural diagram of a high voltage ride through control device for a converter according to an embodiment of the present invention.
  • the high voltage ride through control device of the converter includes a voltage monitoring unit 401, a determining unit 402, a calculating unit 403, and a control unit 404, wherein:
  • the voltage monitoring unit 401 is configured to monitor the grid voltage at the side of the converter network.
  • the determining unit 402 is configured to determine the current operating state of the converter based on the grid voltage and the rated voltage of the converter.
  • the calculating unit 403 is configured to determine, according to the voltage characteristic of the DC bus of the converter, the voltage characteristic of the power grid, and the inductive reactance value of the reactor of the converter, if it is determined that the current operating state of the converter is to enter the high voltage ride through mode. Calculate the reactive current setpoint that needs to be supplied to the reactor.
  • computing unit 403 is further configured to calculate a reactive current reference using the following formula:
  • Iq is the reactive current set value
  • Udc Max is the highest working voltage of the DC bus
  • Kr is the voltage utilization of the DC bus.
  • the vector magnitude of the positive voltage component of the grid voltage, ⁇ is the angular velocity of the grid voltage, and L is the inductive reactance of the reactor.
  • Control unit 404 is configured to provide a reactive current to the reactor based on the reactive current setpoint.
  • FIG. 5 is a schematic structural diagram of a high voltage ride through control device for a converter according to another embodiment of the present invention. 5 is different from FIG. 4 in that the determining unit 402 in FIG. 4 can be refined into the extracting subunit 4021, the filtering subunit 4022, and the determining subunit 4023 in FIG. 5, wherein:
  • the extraction subunit 4021 is configured to extract a positive sequence component of the grid voltage and calculate a vector magnitude of the positive sequence component of the grid voltage
  • Filter subunit 4022 is configured as a vector magnitude of the positive sequence component of the grid voltage Perform low-pass filtering to improve the accuracy of the grid voltage and obtain the vector magnitude after filtering of the positive sequence component of the grid voltage
  • Decision subunit 4023 is configured to be based on Determine the current operating state of the converter with the rated voltage of the converter.
  • the determining subunit is further configured to: multiply the rated voltage of the converter by a predetermined upper limit factor to obtain a first voltage threshold, and multiply the rated voltage of the converter by a predetermined lower limit factor to obtain a second voltage threshold; If it is greater than the first voltage threshold and reaches the first specified time, it is determined that the converter enters a high voltage ride through mode; If it is less than the second voltage threshold and reaches the second specified time, it is determined that the converter exits the high voltage ride through mode.
  • the computing unit 403 is further configured to calculate an active current margin of the converter that is allowed to be incorporated into the grid based on the reactive current setpoint.
  • the control unit 404 is further configured to activate the brake circuit of the converter if the active current capacity of the converter is greater than the active current margin, to consume the active power that cannot be connected to the Internet, and reduce the active power that is integrated into the grid, so that the wind power generation The unit can smoothly pass the high voltage ride through state.
  • control unit 404 is further configured to control the active current margin to increase from the current value until the maximum operating current of the converter is reached, if the converter is determined to exit the high voltage ride through mode. That is, after the grid voltage returns to normal, the active current limit starts to climb from the current value, so that the converter completes the transition from the high voltage crossing state to the normal working state.
  • control unit 404 is further configured to control the reactive output power of the converter to return to an initial value if it is determined that the converter exits the high voltage ride-through mode, and increment from the initial value until the change is reached.
  • the reactive power demand value of the flow device That is, after the grid voltage returns to normal, the reactive power starts to climb from the unit power factor to the reactive power demand value, so that the converter completes the transition from the high voltage crossing state to the normal working state.
  • Embodiments of the present invention also provide a converter for a wind power generator, the converter including a high voltage ride through control device of the current transformer as described above.
  • the high voltage traversing control device may be a separate control device disposed in the converter, or may be implemented by a controller in the converter to perform the function of the high voltage traversing control device, and is not limited herein.
  • the functional blocks shown in the block diagrams described above may be implemented as hardware, software, firmware, or a combination thereof.
  • hardware When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, plug-ins, function cards, and the like.
  • ASIC application specific integrated circuit
  • elements of embodiments of the invention are programs or code segments that are used to perform the required tasks.
  • the program or code segments can be stored in a machine readable medium or transmitted over a transmission medium or communication link through a data signal carried in the carrier.
  • a "machine-readable medium” can include any medium that can store or transfer information.
  • machine-readable media examples include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like.
  • the code segments can be downloaded via a computer network such as the Internet, an intranet, and the like.

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  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention provides a converter, and a method and device for controlling high voltage ride through (HVRT) of a converter. The method for controlling HVRT of a converter comprises: monitoring the grid voltage at a grid side of the converter; determining the current working status of the converter according to the grid voltage and a rated voltage of the converter; if the current working status of the converter is determined to be in HVRT mode, calculating, based on the voltage characteristics of the DC bus of the converter, the voltage characteristics of a power grid, and an inductive reactance value of the converter reactor, the reactive current set value required to supply reactive current to the reactor; supplying the reactive current to the reactor according to the reactive current set value. The present invention provides a method to supply a reactive current for an HVRT mode of a converter and a corresponding strategy for controlling the HVRT, such that the wind turbine generator system has an HVRT function.

Description

变流器、变流器的高电压穿越控制方法和装置High voltage ride through control method and device for converter and converter 技术领域Technical field
本发明涉及风力发电技术领域，尤其涉及一种风力发电机组的变流器、变流器的高电压穿越控制方法和装置。The invention relates to the technical field of wind power generation, in particular to a converter and a high voltage ride through control method and device for a wind power generator.
背景技术Background technique
目前，永磁直驱式风力发电机通过变流器并入电网。变流器的机侧将风力发电机的非定频交流电转换为直流电，网侧将直流电转换为固定频率的交流电并入电网。但是，当电网出现高电压时，变流器的网侧输出功率受到抑制，造成变流器的直流母线电压抬升，触发保护，造成风力发电机组批量停机，对电网形成冲击。因此，要求风力发电机组具备高电压穿越功能。Currently, permanent magnet direct drive wind turbines are integrated into the grid through converters. The machine side of the converter converts the non-fixed-frequency alternating current of the wind turbine into direct current, and the grid side converts the direct current into a fixed-frequency alternating current into the grid. However, when a high voltage occurs in the power grid, the output power of the grid side of the converter is suppressed, causing the DC bus voltage of the converter to rise, triggering protection, causing the wind turbines to stop in batches and forming an impact on the power grid. Therefore, wind turbines are required to have a high voltage ride through function.
目前，通过向变流器输出无功电流，利用无功电流在电网阻抗上形成压降，来降低对提升直流母线电压的要求。At present, by outputting reactive current to the converter, the reactive current is used to form a voltage drop across the grid impedance to reduce the requirement for raising the DC bus voltage.
但是，目前没有给出变流器的高电压穿越模式的无功电流给定方法及其对应的高电压穿越控制策略，以使风力发电机组具备高电压穿越功能。However, there is currently no reactive current reference method for the high voltage ride through mode of the converter and its corresponding high voltage ride through control strategy to enable the wind turbine to have a high voltage ride through function.
发明内容Summary of the invention
本发明提供了一种风力发电机组的变流器、变流器的高电压穿越控制方法和装置，给出了针对变流器的高电压穿越模式的无功电流给定方法及其对应的高电压穿越控制策略，从而使得风力发电机组具备高电压穿越功能。The invention provides a high voltage ride through control method and device for a converter and a converter of a wind power generator, and a reactive current given method for a high voltage ride through mode of a converter and a corresponding high thereof are given. The voltage traversal control strategy allows the wind turbine to have a high voltage ride through function.
第一方面，本发明实施例提供了一种变流器的高电压穿越控制方法，该高电压穿越控制方法包括：In a first aspect, an embodiment of the present invention provides a high voltage ride through control method for a current transformer, where the high voltage ride through control method includes:
监测变流器网侧端的电网电压；Monitoring the grid voltage at the side of the converter network;
根据电网电压和变流器的额定电压，判定变流器的当前工作状态；Determining the current working state of the converter according to the grid voltage and the rated voltage of the converter;
若判定变流器的当前工作状态为进入高电压穿越模式，则根据变流器的直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，计算需要提供给电抗器的无功电流给定值；以及If it is determined that the current working state of the converter is to enter the high voltage ride-through mode, the calculation needs to be provided to the reactor according to the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter. Reactive current reference; and
根据无功电流给定值，向电抗器提供无功电流。According to the reactive current set value, the reactive current is supplied to the reactor.
在第一方面的一些实施例中，根据变流器的直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，计算需要提供给电抗器的无功电流给定值，包括：In some embodiments of the first aspect, the reactive current setpoint to be provided to the reactor is calculated based on the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter. ,include:
利用以下公式，计算无功电流给定值：Calculate the reactive current reference using the following formula:
Figure PCTCN2018085823-appb-000001
Figure PCTCN2018085823-appb-000001
其中，Iq为无功电流给定值，Udc Max为直流母线的最高工作电压，Kr为直流母线的电压利用率，
Figure PCTCN2018085823-appb-000002
为电网电压的正压分量的矢量幅值，ω为电网电压的角速度，L为电抗器的感抗值。 Where Iq is the reactive current set value, Udc Max is the highest working voltage of the DC bus, and Kr is the voltage utilization of the DC bus.
Figure PCTCN2018085823-appb-000002
The vector magnitude of the positive voltage component of the grid voltage, ω is the angular velocity of the grid voltage, and L is the inductive reactance of the reactor.
在第一方面的一些实施例中，根据电网电压和变流器的额定电压，判定变流器的当前工作状态，包括：In some embodiments of the first aspect, the current operating state of the converter is determined based on the grid voltage and the rated voltage of the converter, including:
提取电网电压的正序分量；Extracting the positive sequence component of the grid voltage;
计算电网电压的正序分量的矢量幅值
Figure PCTCN2018085823-appb-000003
Calculate the vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000003
对电网电压的正序分量的矢量幅值
Figure PCTCN2018085823-appb-000004
进行低通滤波处理，得到电网电压的正序分量的滤波处理后的矢量幅值
Figure PCTCN2018085823-appb-000005
以及 Vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000004
Perform low-pass filtering to obtain the filtered vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000005
as well as
根据
Figure PCTCN2018085823-appb-000006
与变流器的额定电压，判定变流器的当前工作状态。 according to
Figure PCTCN2018085823-appb-000006
Determine the current operating state of the converter with the rated voltage of the converter.
在第一方面的一些实施例中，根据
Figure PCTCN2018085823-appb-000007
与变流器的额定电压，判定变流器的当前工作状态，包括： In some embodiments of the first aspect,
Figure PCTCN2018085823-appb-000007
With the rated voltage of the converter, determine the current operating state of the converter, including:
将变流器的额定电压乘以预定上限因子，得到第一电压阈值，将变流器的额定电压乘以预定下限因子，得到第二电压阈值；Multiplying the rated voltage of the converter by a predetermined upper limit factor to obtain a first voltage threshold, multiplying the rated voltage of the converter by a predetermined lower limit factor to obtain a second voltage threshold;
若
Figure PCTCN2018085823-appb-000008
大于第一电压阈值，且达到第一指定时间，则判定变流器进入高电压穿越模式；以及 If
Figure PCTCN2018085823-appb-000008
If the first voltage threshold is greater than the first voltage threshold, and the first specified time is reached, determining that the converter enters a high voltage ride through mode;
若
Figure PCTCN2018085823-appb-000009
小于第二电压阈值，且达到第二指定时间，则判定变流器退出高电压穿越模式。 If
Figure PCTCN2018085823-appb-000009
If it is less than the second voltage threshold and reaches the second specified time, it is determined that the converter exits the high voltage ride through mode.
在第一方面的一些实施例中，在根据无功电流给定值，向电抗器提供无功电流之后，高电压穿越控制方法还包括：In some embodiments of the first aspect, after the reactive current is supplied to the reactor according to the reactive current reference value, the high voltage ride through control method further includes:
根据无功电流给定值，计算变流器的允许并入电网的有功电流裕量；Calculating the active current margin of the converter that is allowed to be integrated into the grid based on the reactive current setpoint;
若变流器的有功电流容量大于有功电流裕量，则启动变流器的制动回路。If the active current capacity of the converter is greater than the active current margin, the brake circuit of the converter is started.
在第一方面的一些实施例中，在根据无功电流给定值，计算变流器的允许并入电网的有功电流裕量之后，高电压穿越控制方法还包括：In some embodiments of the first aspect, after calculating the active current margin of the converter that is allowed to be integrated into the grid according to the reactive current set value, the high voltage ride through control method further includes:
若判定变流器退出高电压穿越模式，则控制有功电流裕量从当前值开始递增，直到达到变流器的最大工作电流；或者/并且If it is determined that the converter exits the high voltage ride through mode, the control active current margin is incremented from the current value until the maximum operating current of the converter is reached; or / and
若判定变流器退出高电压穿越模式，则控制变流器的无功输出功率恢复到初始值，从初始值开始递增，直到达到变流器的无功功率需求值。If it is determined that the converter exits the high voltage ride through mode, the reactive output power of the control converter is restored to the initial value, and is incremented from the initial value until the reactive power demand value of the converter is reached.
第二方面，本发明实施例提供一种变流器的高电压穿越控制装置，该高电压穿越控制装置包括：In a second aspect, an embodiment of the present invention provides a high voltage ride through control device for a converter, where the high voltage ride through control device includes:
电压监测单元，被配置为监测变流器网侧端的电网电压；a voltage monitoring unit configured to monitor a grid voltage at a side of the converter network;
判定单元，被配置为根据电网电压和变流器的额定电压，判定变流器的当前工作状态；a determining unit configured to determine a current operating state of the converter according to the grid voltage and the rated voltage of the converter;
计算单元，被配置为若判定变流器的当前工作状态为进入高电压穿越模式，则根据变流器的直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，计算需要提供给电抗器的无功电流给定值；以及The calculating unit is configured to determine, according to the voltage characteristic of the DC bus of the converter, the voltage characteristic of the power grid, and the inductive reactance value of the reactor of the converter, if it is determined that the current operating state of the converter is to enter the high voltage ride through mode. Calculate the reactive current setpoint that needs to be supplied to the reactor;
控制单元，被配置为根据无功电流给定值，向电抗器提供无功电流。The control unit is configured to provide a reactive current to the reactor according to the reactive current reference value.
在第二方面的一些实施例中，计算单元还被配置为利用以下公式，计算无功电流给定值：In some embodiments of the second aspect, the computing unit is further configured to calculate the reactive current reference using the following formula:
Figure PCTCN2018085823-appb-000010
Figure PCTCN2018085823-appb-000010
其中，Ip为无功电流给定值，Udc Max为直流母线的最高工作电压，Kr为直流母线的电压利用率，
Figure PCTCN2018085823-appb-000011
为电网电压的正压分量的矢量幅值，ω为电网电压的角速度，L为电抗器的感抗值。 Where Ip is the reactive current setpoint, Udc Max is the highest operating voltage of the DC bus, and Kr is the voltage utilization of the DC bus.
Figure PCTCN2018085823-appb-000011
The vector magnitude of the positive voltage component of the grid voltage, ω is the angular velocity of the grid voltage, and L is the inductive reactance of the reactor.
在第二方面的一些实施例中，判定单元包括：In some embodiments of the second aspect, the determining unit comprises:
提取子单元，被配置为提取电网电压的正序分量，并计算电网电压的正序分量的矢量幅值
Figure PCTCN2018085823-appb-000012
Extracting a subunit configured to extract a positive sequence component of the grid voltage and calculate a vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000012
滤波子单元，被配置为对电网电压的正序分量的矢量幅值
Figure PCTCN2018085823-appb-000013
进行低通滤波处理，得到电网电压的正序分量的滤波处理后的矢量幅值
Figure PCTCN2018085823-appb-000014
以及 Filter subunit, configured as a vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000013
Perform low-pass filtering to obtain the filtered vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000014
as well as
判定子单元，被配置为根据
Figure PCTCN2018085823-appb-000015
与变流器的额定电压，判定变流器的当前工作状态。 a decision subunit configured to be based on
Figure PCTCN2018085823-appb-000015
Determine the current operating state of the converter with the rated voltage of the converter.
在第二方面的一些实施例中，判定子单元还被配置为将变流器的额定电压乘以预定上限因子，得到第一电压阈值，将变流器的额定电压乘以预定下限因子，得到第二电压阈值；若
Figure PCTCN2018085823-appb-000016
大于第一电压阈值，且达到第一指定时间，则判定变流器进入高电压穿越模式；若
Figure PCTCN2018085823-appb-000017
小于第二电压阈值，且达到第二指定时间，则判定变流器退出高电压穿越模式。 In some embodiments of the second aspect, the determining subunit is further configured to multiply the rated voltage of the converter by a predetermined upper limit factor to obtain a first voltage threshold, multiplying the rated voltage of the converter by a predetermined lower limit factor, Second voltage threshold; if
Figure PCTCN2018085823-appb-000016
If it is greater than the first voltage threshold and reaches the first specified time, it is determined that the converter enters a high voltage ride through mode;
Figure PCTCN2018085823-appb-000017
If it is less than the second voltage threshold and reaches the second specified time, it is determined that the converter exits the high voltage ride through mode.
在第二方面的一些实施例中，计算单元还被配置为根据无功电流给定值，计算变流器的允许并入电网的有功电流裕量；控制单元还被配置为若变流器的有功电流容量大于有功电流裕量，则启动变流器的制动回路。In some embodiments of the second aspect, the computing unit is further configured to calculate an active current margin of the converter that is allowed to be incorporated into the grid based on the reactive current setpoint; the control unit is further configured to When the active current capacity is greater than the active current margin, the brake circuit of the converter is started.
在第二方面的一些实施例中，控制单元还被配置为若判定变流器退出高电压穿越模式，则控制有功电流裕量从当前值开始递增，直到达到变流器的最大工作电流；或者/并且若判定变流器退出高电压穿越模式，则控制变流器的无功输出功率恢复到初始值，从初始值开始递增，直到达到变流器的无功功率需求值。In some embodiments of the second aspect, the control unit is further configured to: if the converter is determined to exit the high voltage ride through mode, control the active current margin to increase from the current value until the maximum operating current of the converter is reached; or / and if it is determined that the converter exits the high voltage ride through mode, the reactive output power of the control converter is restored to the initial value, and is incremented from the initial value until the reactive power demand value of the converter is reached.
第三方面，本发明实施例提供一种风力发电机组的变流器，该变流器包括如上所述的变流器的高电压穿越控制装置。In a third aspect, an embodiment of the present invention provides a converter for a wind power generator, the converter including a high voltage ride through control device of the current transformer as described above.
本发明实施例的变流器的高电压穿越控制方法，可以通过监测变流器网侧端的电网电压，根据电网电压和变流器的额定电压，判定变流器的当前工作状态。若判定变流器的当前工作状态为进入高电压穿越模式，可以根据变流器的直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，计算需要提供给电抗器的无功电流给定值，然后根据无功电流给定值，向电抗器提供无功电流。由于本发明实施例的变流器的高电压穿越控制方法在计算无功电流给定值时，考虑了直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，使得计算得到的无功电流给定值能够与直流母线、电网和电抗器相适配，从而使得电抗器消耗对应无功电流形成的压降，能够与变流器在高压穿越过程中电网冲击造成的直流母线电压的抬升相抵消，进而使得风力发电机组具备高电压穿越功能。The high voltage ride through control method of the converter of the embodiment of the invention can determine the current working state of the converter according to the grid voltage at the side of the converter network and the rated voltage of the converter. If it is determined that the current working state of the converter is to enter the high voltage ride-through mode, the calculation may be provided to the reactor according to the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter. The reactive current is given a value, and then the reactive current is supplied to the reactor according to the reactive current set value. Since the high voltage ride through control method of the converter of the embodiment of the present invention calculates the reactive current set value, the voltage characteristics of the DC bus, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter are considered. The calculated reactive current setpoint can be matched with the DC bus, the grid and the reactor, so that the reactor consumes the voltage drop corresponding to the reactive current, which can be caused by the grid impact during the high-voltage crossing of the converter. The rise of the DC bus voltage is offset, which in turn allows the wind turbine to have a high voltage ride through function.
另外，由于本发明实施例中的变流器的高电压穿越控制方法在计算无 功电流给定值时，考虑了直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，因此能够适用于不同电网的高电压穿越标准需求，从而避免能够对风力发电机组的变流器进行硬件改造，节约了成本。In addition, since the high voltage ride through control method of the converter in the embodiment of the present invention calculates the reactive current set value, the voltage characteristics of the DC bus, the voltage characteristics of the power grid, and the inductive reactance of the reactor of the converter are considered. The value can therefore be applied to the high voltage ride through standard requirements of different grids, thus avoiding the hardware modification of the wind turbine converter and saving costs.
此外，本发明实施例中的变流器的高电压穿越控制方法能够在低电压穿越和高电压穿越频繁交替的运行工况下，及时响应高电压穿越需求，避免风力发电机组及其变流器受到高电压穿越工况的破坏。In addition, the high voltage ride through control method of the converter in the embodiment of the invention can respond to high voltage traversing requirements in time under low operating conditions of low voltage traversing and high voltage traversing, avoiding wind turbines and their converters. Damaged by high voltage crossing conditions.
附图说明DRAWINGS
从下面结合附图对本发明的具体实施方式的描述中可以更好地理解本发明，其中，相同或相似的附图标记表示相同或相似的特征。The invention may be better understood from the following description of the embodiments of the invention, in which the same or similar reference numerals indicate the same or similar features.
图1为本发明一实施例提供的变流器的高电压穿越控制方法的流程示意图；1 is a schematic flow chart of a high voltage ride through control method for a converter according to an embodiment of the present invention;
图2为本发明另一实施例提供的变流器的高电压穿越控制方法的流程示意图；2 is a schematic flow chart of a high voltage ride through control method of a converter according to another embodiment of the present invention;
图3为本发明又一实施例提供的变流器的高电压穿越控制方法的流程示意图；3 is a schematic flow chart of a high voltage ride through control method for a converter according to another embodiment of the present invention;
图4为本发明一实施例提供的变流器的高电压穿越控制装置的结构示意图；4 is a schematic structural diagram of a high voltage ride through control device for a converter according to an embodiment of the present invention;
图5为本发明另一实施例提供的变流器的高电压穿越控制装置的结构示意图。FIG. 5 is a schematic structural diagram of a high voltage ride through control device for a converter according to another embodiment of the present invention.
具体实施方式Detailed ways
下面将详细描述本发明实施例的各个方面的特征和示例性实施例。在下面的详细描述中，提出了许多具体细节，以便提供对本发明实施例的全面理解。Features and exemplary embodiments of various aspects of embodiments of the invention are described in detail below. In the following detailed description, numerous specific details are set forth
本发明实施例提供了一种风力发电机组的变流器、变流器的高电压穿越控制方法和装置，给出了针对变流器的高电压穿越模式的无功电流给定方法及其对应的高电压穿越控制策略，从而使得风力发电机组具备高电压穿越功能。The embodiment of the invention provides a high voltage ride through control method and device for a converter and a converter of a wind power generator, and a reactive current given method for a high voltage ride through mode of the converter and corresponding The high voltage ride-through control strategy allows the wind turbine to have a high voltage ride through function.
图1为本发明一实施例提供的变流器的高电压穿越控制方法的流程示意图。如图1所示，该变流器的高电压穿越控制方法包括步骤101至步骤104。FIG. 1 is a schematic flow chart of a high voltage ride through control method for a converter according to an embodiment of the present invention. As shown in FIG. 1, the high voltage ride through control method of the converter includes steps 101 to 104.
在步骤101中，监测变流器网侧端的电网电压。In step 101, the grid voltage at the side of the converter network is monitored.
在步骤102中，根据电网电压和变流器的额定电压，判定变流器的当前工作状态。In step 102, the current operating state of the converter is determined based on the grid voltage and the rated voltage of the converter.
在步骤103中，若判定变流器的当前工作状态为进入高电压穿越模式，则根据变流器的直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，计算需要提供给电抗器的无功电流给定值。In step 103, if it is determined that the current operating state of the converter is to enter the high voltage ride-through mode, the voltage characteristic of the DC bus of the converter, the voltage characteristic of the power grid, and the inductive reactance value of the reactor of the converter are calculated. Reactive current reference to the reactor is required.
在一示例中，可以利用以下公式，计算无功电流给定值：In an example, the reactive current reference can be calculated using the following formula:
Figure PCTCN2018085823-appb-000018
Figure PCTCN2018085823-appb-000018
其中，Iq为无功电流给定值，Udc Max为直流母线的最高工作电压，Kr为直流母线的电压利用率，
Figure PCTCN2018085823-appb-000019
为电网电压的正压分量的矢量幅值，ω为电网电压的角速度，L为电抗器的感抗值。 Where Iq is the reactive current set value, Udc Max is the highest working voltage of the DC bus, and Kr is the voltage utilization of the DC bus.
Figure PCTCN2018085823-appb-000019
The vector magnitude of the positive voltage component of the grid voltage, ω is the angular velocity of the grid voltage, and L is the inductive reactance of the reactor.
在步骤104中，根据无功电流给定值，向电抗器提供无功电流。In step 104, a reactive current is supplied to the reactor according to the reactive current set value.
根据本发明实施例的变流器的高电压穿越控制方法，可以通过监测变流器网侧端的电网电压，并根据电网电压和变流器的额定电压判定变流器的当前工作状态。若判定变流器的当前工作状态为进入高电压穿越模式，可以根据变流器的直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，计算需要提供给电抗器的无功电流给定值，然后根据无功电流给定值向电抗器提供无功电流。由于本发明实施例的变流器的高电压穿越控制方法在计算无功电流给定值时，考虑了直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，使得计算得到的无功电流给定值能够与直流母线、电网和电抗器相适配，从而使得电抗器消耗对应无功电流形成的压降能够与变流器在高压穿越过程中电网冲击造成的直流母线电压的抬升相抵消，进而使得风力发电机组具备高电压穿越功能。According to the high voltage ride through control method of the converter according to the embodiment of the invention, the grid voltage at the side of the converter network can be monitored, and the current operating state of the converter can be determined according to the grid voltage and the rated voltage of the converter. If it is determined that the current working state of the converter is to enter the high voltage ride-through mode, the calculation may be provided to the reactor according to the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter. The reactive current is given a value, and then the reactive current is supplied to the reactor according to the reactive current reference value. Since the high voltage ride through control method of the converter of the embodiment of the present invention calculates the reactive current set value, the voltage characteristics of the DC bus, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter are considered. The calculated reactive current setpoint can be matched with the DC bus, the grid and the reactor, so that the voltage drop formed by the reactor corresponding to the reactive current can be compared with the DC caused by the converter during the high voltage crossing process. The rise of the bus voltage is offset, which in turn allows the wind turbine to have a high voltage ride through function.
另外，由于本发明实施例中的变流器的高电压穿越控制方法在计算无功电流给定值时，考虑了直流母线的电压特性、电网的电压特性和变流器的电抗器的感抗值，因此能够适用于不同电网的高电压穿越标准需求，从 而能够避免对风力发电机组的变流器进行硬件改造，节约了成本。In addition, since the high voltage ride through control method of the converter in the embodiment of the present invention calculates the reactive current set value, the voltage characteristics of the DC bus, the voltage characteristics of the power grid, and the inductive reactance of the reactor of the converter are considered. The value can therefore be adapted to the high voltage ride through standard requirements of different grids, thus avoiding hardware modifications to the wind turbine converter and saving costs.
此外，本发明实施例中的变流器的高电压穿越控制方法能够在低电压穿越和高电压穿越频繁交替的运行工况下，及时响应高电压穿越需求，避免风力发电机组及其变流器受到高电压穿越工况的破坏。In addition, the high voltage ride through control method of the converter in the embodiment of the invention can respond to high voltage traversing requirements in time under low operating conditions of low voltage traversing and high voltage traversing, avoiding wind turbines and their converters. Damaged by high voltage crossing conditions.
图2为本发明另一实施例提供的变流器的高电压穿越控制方法的流程示意图。图2与图1的不同之处在于，图1中的步骤102可细化为图2中的步骤1021至步骤1024。2 is a schematic flow chart of a high voltage ride through control method for a converter according to another embodiment of the present invention. 2 is different from FIG. 1 in that step 102 in FIG. 1 can be refined into steps 1021 to 1024 in FIG.
在步骤1021中，提取电网电压的正序分量。In step 1021, a positive sequence component of the grid voltage is extracted.
在步骤1022中，计算电网电压的正序分量的矢量幅值
Figure PCTCN2018085823-appb-000020
In step 1022, calculating the vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000020
在步骤1023中，对电网电压的正序分量的矢量幅值
Figure PCTCN2018085823-appb-000021
进行低通滤波处理，提高电网电压的准确度，得到电网电压的正序分量的滤波处理后的矢量幅值
Figure PCTCN2018085823-appb-000022
In step 1023, the vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000021
Perform low-pass filtering to improve the accuracy of the grid voltage and obtain the vector magnitude after filtering of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000022
在步骤1024中，根据
Figure PCTCN2018085823-appb-000023
与变流器的额定电压，判定变流器的当前工作状态。 In step 1024, according to
Figure PCTCN2018085823-appb-000023
Determine the current operating state of the converter with the rated voltage of the converter.
具体地，可以将变流器的额定电压乘以预定上限因子，得到第一电压阈值，将变流器的额定电压乘以预定下限因子，得到第二电压阈值。若
Figure PCTCN2018085823-appb-000024
大于第一电压阈值，且达到第一指定时间，则判定变流器进入高电压穿越模式；若
Figure PCTCN2018085823-appb-000025
小于第二电压阈值，且达到第二指定时间，则判定变流器退出高电压穿越模式。 Specifically, the rated voltage of the converter may be multiplied by a predetermined upper limit factor to obtain a first voltage threshold, and the rated voltage of the converter is multiplied by a predetermined lower limit factor to obtain a second voltage threshold. If
Figure PCTCN2018085823-appb-000024
If it is greater than the first voltage threshold and reaches the first specified time, it is determined that the converter enters a high voltage ride through mode;
Figure PCTCN2018085823-appb-000025
If it is less than the second voltage threshold and reaches the second specified time, it is determined that the converter exits the high voltage ride through mode.
在一示例中，预定上限因子可以为1.1，第一持续时间可以为10ms。若
Figure PCTCN2018085823-appb-000026
大于1.1倍的额定电压且持续10ms，则判定变流器进入高电压穿越模式，即高电压穿越状态使能。 In an example, the predetermined upper limit factor may be 1.1 and the first duration may be 10 ms. If
Figure PCTCN2018085823-appb-000026
When the rated voltage is greater than 1.1 times and lasts for 10 ms, it is determined that the converter enters a high voltage ride through mode, that is, a high voltage ride through state is enabled.
在另一示例中，预定下限因子可以为1.09，第一持续时间也可以为10ms。若
Figure PCTCN2018085823-appb-000027
小于1.09倍的额定电压且持续10ms，则判定变流器进入低电压穿越模式，即低电压穿越状态使能。 In another example, the predetermined lower limit factor may be 1.09 and the first duration may also be 10 ms. If
Figure PCTCN2018085823-appb-000027
With a rated voltage less than 1.09 times and lasting 10 ms, it is determined that the converter enters a low voltage ride through mode, that is, a low voltage ride through state is enabled.
需要说明的是，预定下限因子小于预定上限因子，第一持续时间和第二持续时间可以相等也可以不相等。本领域技术人员可以根据风力发电机组的实际运行数据设定预定上限因子、预定下限因子、第一持续时间和第二持续时间，此处不进行限制。It should be noted that the predetermined lower limit factor is less than the predetermined upper limit factor, and the first duration and the second duration may be equal or unequal. A person skilled in the art can set a predetermined upper limit factor, a predetermined lower limit factor, a first duration and a second duration according to actual operating data of the wind turbine, and no limitation is made here.
图3为本发明又一实施例提供的变流器的高电压穿越控制方法的流程示意图。图3与图1的不同之处在于，在图1中的步骤104之后，该变流器的高电压穿越控制方法包括还包括图3中的步骤105和步骤106。FIG. 3 is a schematic flow chart of a high voltage ride through control method for a converter according to another embodiment of the present invention. 3 differs from FIG. 1 in that, after step 104 in FIG. 1, the high voltage ride through control method of the converter includes steps 105 and 106 in FIG.
在步骤105中，根据无功电流给定值，计算变流器的允许并入电网的有功电流裕量。In step 105, the active current margin of the converter that is allowed to be incorporated into the grid is calculated based on the reactive current setpoint.
在一示例中，可以利用以下公式计算有功电流裕量：In an example, the active current margin can be calculated using the following formula:
Figure PCTCN2018085823-appb-000028
Figure PCTCN2018085823-appb-000028
其中，Ip为有功电流裕量，I Max为变流器的最大工作电流，Iq为无功电流给定值。 Among them, Ip is the active current margin, I Max is the maximum operating current of the converter, and Iq is the reactive current setpoint.
在步骤106中，若变流器的有功电流容量大于有功电流裕量，则可以启动变流器的制动回路，以消耗不能上网的有功功率，降低并入电网的有功功率，使得风力发电机组能够顺利经过高电压穿越状态。In step 106, if the active current capacity of the converter is greater than the active current margin, the brake circuit of the converter can be activated to consume the active power that cannot be connected to the Internet, and reduce the active power that is integrated into the grid, so that the wind turbine Can pass the high voltage crossing state smoothly.
在本发明一些实施例中，在步骤105之后，若判定变流器退出高电压穿越模式，则可以控制有功电流裕量从当前值开始递增，直到达到变流器的最大工作电流。即电网电压恢复正常后，有功电流限值从当前值开始爬坡，使得变流器完成从高电压穿越状态到正常工作状态的过渡。In some embodiments of the present invention, after step 105, if it is determined that the converter exits the high voltage ride through mode, the active current margin can be controlled to increase from the current value until the maximum operating current of the converter is reached. That is, after the grid voltage returns to normal, the active current limit starts to climb from the current value, so that the converter completes the transition from the high voltage crossing state to the normal working state.
在本发明一些实施例中，在步骤104之后，若判定变流器退出高电压穿越模式，还可以控制变流器的无功输出功率恢复到初始值，从初始值开始递增，直到达到变流器的无功功率需求值。即电网电压恢复正常后，无功功率从单位功率因数开始爬坡到无功功率需求值，使得变流器完成从高电压穿越状态到正常工作状态的过渡。In some embodiments of the present invention, after step 104, if it is determined that the converter exits the high voltage ride through mode, the reactive output power of the converter can be controlled to return to the initial value, and the increment is started from the initial value until the variable current is reached. The reactive power demand value of the device. That is, after the grid voltage returns to normal, the reactive power starts to climb from the unit power factor to the reactive power demand value, so that the converter completes the transition from the high voltage crossing state to the normal working state.
图4为本发明一实施例提供的变流器的高电压穿越控制装置的结构示意图。如图4所示，该变流器的高电压穿越控制装置包括电压监测单元401、判定单元402、计算单元403和控制单元404，其中：FIG. 4 is a schematic structural diagram of a high voltage ride through control device for a converter according to an embodiment of the present invention. As shown in FIG. 4, the high voltage ride through control device of the converter includes a voltage monitoring unit 401, a determining unit 402, a calculating unit 403, and a control unit 404, wherein:
电压监测单元401被配置为监测变流器网侧端的电网电压。The voltage monitoring unit 401 is configured to monitor the grid voltage at the side of the converter network.
判定单元402被配置为根据电网电压和变流器的额定电压，判定变流器的当前工作状态。The determining unit 402 is configured to determine the current operating state of the converter based on the grid voltage and the rated voltage of the converter.
计算单元403被配置为若判定变流器的当前工作状态为进入高电压穿越模式，则根据变流器的直流母线的电压特性、电网的电压特性和变流器 的电抗器的感抗值，计算需要提供给电抗器的无功电流给定值。The calculating unit 403 is configured to determine, according to the voltage characteristic of the DC bus of the converter, the voltage characteristic of the power grid, and the inductive reactance value of the reactor of the converter, if it is determined that the current operating state of the converter is to enter the high voltage ride through mode. Calculate the reactive current setpoint that needs to be supplied to the reactor.
在一示例中，计算单元403还被配置为利用以下公式，计算无功电流给定值：In an example, computing unit 403 is further configured to calculate a reactive current reference using the following formula:
Figure PCTCN2018085823-appb-000029
Figure PCTCN2018085823-appb-000029
其中，Iq为无功电流给定值，Udc Max为直流母线的最高工作电压，Kr为直流母线的电压利用率，
Figure PCTCN2018085823-appb-000030
为电网电压的正压分量的矢量幅值，ω为电网电压的角速度，L为电抗器的感抗值。 Where Iq is the reactive current set value, Udc Max is the highest working voltage of the DC bus, and Kr is the voltage utilization of the DC bus.
Figure PCTCN2018085823-appb-000030
The vector magnitude of the positive voltage component of the grid voltage, ω is the angular velocity of the grid voltage, and L is the inductive reactance of the reactor.
控制单元404被配置为根据无功电流给定值，向电抗器提供无功电流。Control unit 404 is configured to provide a reactive current to the reactor based on the reactive current setpoint.
图5为本发明另一实施例提供的变流器的高电压穿越控制装置的结构示意图。图5与图4的不同之处在于，图4中的判定单元402可细化为图5中的提取子单元4021、滤波子单元4022和判定子单元4023，其中：FIG. 5 is a schematic structural diagram of a high voltage ride through control device for a converter according to another embodiment of the present invention. 5 is different from FIG. 4 in that the determining unit 402 in FIG. 4 can be refined into the extracting subunit 4021, the filtering subunit 4022, and the determining subunit 4023 in FIG. 5, wherein:
提取子单元4021被配置为提取电网电压的正序分量，并计算电网电压的正序分量的矢量幅值
Figure PCTCN2018085823-appb-000031
The extraction subunit 4021 is configured to extract a positive sequence component of the grid voltage and calculate a vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000031
滤波子单元4022被配置为对电网电压的正序分量的矢量幅值
Figure PCTCN2018085823-appb-000032
进行低通滤波处理，提高电网电压的准确度，得到电网电压的正序分量的滤波处理后的矢量幅值
Figure PCTCN2018085823-appb-000033
Filter subunit 4022 is configured as a vector magnitude of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000032
Perform low-pass filtering to improve the accuracy of the grid voltage and obtain the vector magnitude after filtering of the positive sequence component of the grid voltage
Figure PCTCN2018085823-appb-000033
判定子单元4023被配置为根据
Figure PCTCN2018085823-appb-000034
与变流器的额定电压，判定变流器的当前工作状态。 Decision subunit 4023 is configured to be based on
Figure PCTCN2018085823-appb-000034
Determine the current operating state of the converter with the rated voltage of the converter.
具体地，判定子单元还被配置为：将变流器的额定电压乘以预定上限因子，得到第一电压阈值，将变流器的额定电压乘以预定下限因子，得到第二电压阈值；若
Figure PCTCN2018085823-appb-000035
大于第一电压阈值，且达到第一指定时间，则判定变流器进入高电压穿越模式；若
Figure PCTCN2018085823-appb-000036
小于第二电压阈值，且达到第二指定时间，则判定变流器退出高电压穿越模式。 Specifically, the determining subunit is further configured to: multiply the rated voltage of the converter by a predetermined upper limit factor to obtain a first voltage threshold, and multiply the rated voltage of the converter by a predetermined lower limit factor to obtain a second voltage threshold;
Figure PCTCN2018085823-appb-000035
If it is greater than the first voltage threshold and reaches the first specified time, it is determined that the converter enters a high voltage ride through mode;
Figure PCTCN2018085823-appb-000036
If it is less than the second voltage threshold and reaches the second specified time, it is determined that the converter exits the high voltage ride through mode.
在本发明一些实施例中，计算单元403还被配置为根据无功电流给定值，计算变流器的允许并入电网的有功电流裕量。控制单元404还被配置为若变流器的有功电流容量大于有功电流裕量，则启动变流器的制动回路，以消耗不能上网的有功功率，降低并入电网的有功功率，使得风力发电机组能够顺利经过高电压穿越状态。In some embodiments of the invention, the computing unit 403 is further configured to calculate an active current margin of the converter that is allowed to be incorporated into the grid based on the reactive current setpoint. The control unit 404 is further configured to activate the brake circuit of the converter if the active current capacity of the converter is greater than the active current margin, to consume the active power that cannot be connected to the Internet, and reduce the active power that is integrated into the grid, so that the wind power generation The unit can smoothly pass the high voltage ride through state.
在本发明一些实施例中，控制单元404还被配置为若判定变流器退出高电压穿越模式，则控制有功电流裕量从当前值开始递增，直到达到变流器的最大工作电流。即电网电压恢复正常后，有功电流限值从当前值开始爬坡，使得变流器完成从高电压穿越状态到正常工作状态的过渡。In some embodiments of the invention, control unit 404 is further configured to control the active current margin to increase from the current value until the maximum operating current of the converter is reached, if the converter is determined to exit the high voltage ride through mode. That is, after the grid voltage returns to normal, the active current limit starts to climb from the current value, so that the converter completes the transition from the high voltage crossing state to the normal working state.
在本发明一些实施例中，控制单元404还被配置为若判定变流器退出高电压穿越模式，则控制变流器的无功输出功率恢复到初始值，从初始值开始递增，直到达到变流器的无功功率需求值。即电网电压恢复正常后，无功功率从单位功率因数开始爬坡到无功功率需求值，使得变流器完成从高电压穿越状态到正常工作状态的过渡。In some embodiments of the present invention, the control unit 404 is further configured to control the reactive output power of the converter to return to an initial value if it is determined that the converter exits the high voltage ride-through mode, and increment from the initial value until the change is reached. The reactive power demand value of the flow device. That is, after the grid voltage returns to normal, the reactive power starts to climb from the unit power factor to the reactive power demand value, so that the converter completes the transition from the high voltage crossing state to the normal working state.
本发明实施例还提供一种风力发电机组的变流器，该变流器包括如上所述的变流器的高电压穿越控制装置。其中，高电压穿越控制装置可以是设置于变流器中的单独的控制装置，也可以由变流器中的控制器执行高电压穿越控制装置的功能，此处不进行限制。Embodiments of the present invention also provide a converter for a wind power generator, the converter including a high voltage ride through control device of the current transformer as described above. The high voltage traversing control device may be a separate control device disposed in the converter, or may be implemented by a controller in the converter to perform the function of the high voltage traversing control device, and is not limited herein.
需要明确的是，本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同或相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。对于装置实施例而言，相关之处可以参见方法实施例的说明部分。本发明实施例并不局限于上文所描述并在图中示出的特定步骤和结构。本领域的技术人员可以在领会本发明实施例的精神之后，作出各种改变、修改和添加，或者改变步骤之间的顺序。并且，为了简明起见，这里省略对已知方法技术的详细描述。It is to be understood that the various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the difference from other embodiments. Where. For device embodiments, the relevant aspects can be found in the description section of the method embodiment. The embodiments of the invention are not limited to the specific steps and structures described above and illustrated in the drawings. A person skilled in the art can make various changes, modifications and additions, or change the order between the steps after the spirit of the embodiments of the present invention. Also, a detailed description of known method techniques is omitted herein for the sake of brevity.
以上所述的结构框图中所示的功能块可以实现为硬件、软件、固件或者它们的组合。当以硬件方式实现时，其可以例如是电子电路、专用集成电路(ASIC)、适当的固件、插件、功能卡等等。当以软件方式实现时，本发明实施例的元素是被用于执行所需任务的程序或者代码段。程序或者代码段可以存储在机器可读介质中，或者通过载波中携带的数据信号在传输介质或者通信链路上传送。“机器可读介质”可以包括能够存储或传输信息的任何介质。机器可读介质的例子包括电子电路、半导体存储器设备、ROM、闪存、可擦除ROM(EROM)、软盘、CD-ROM、光盘、硬盘、光纤介质、射频(RF)链路，等等。代码段可以经由诸如因特网、内联网等的计算机网络被下载。The functional blocks shown in the block diagrams described above may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, plug-ins, function cards, and the like. When implemented in software, elements of embodiments of the invention are programs or code segments that are used to perform the required tasks. The program or code segments can be stored in a machine readable medium or transmitted over a transmission medium or communication link through a data signal carried in the carrier. A "machine-readable medium" can include any medium that can store or transfer information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments can be downloaded via a computer network such as the Internet, an intranet, and the like.

Claims (13)

  1. 一种变流器的高电压穿越控制方法，其特征在于，包括：A high voltage ride through control method for a converter, comprising:
    监测变流器网侧端的电网电压；Monitoring the grid voltage at the side of the converter network;
    根据所述电网电压和所述变流器的额定电压，判定所述变流器的当前工作状态；Determining a current operating state of the converter according to the grid voltage and a rated voltage of the converter;
    若判定所述变流器的当前工作状态为进入高电压穿越模式，则根据所述变流器的直流母线的电压特性、电网的电压特性和所述变流器的电抗器的感抗值，计算需要提供给所述电抗器的无功电流给定值；以及If it is determined that the current operating state of the converter is to enter a high voltage ride through mode, according to the voltage characteristics of the DC bus of the converter, the voltage characteristics of the power grid, and the inductive reactance value of the reactor of the converter, Calculating the reactive current setpoint that needs to be provided to the reactor;
    根据所述无功电流给定值，向所述电抗器提供无功电流。A reactive current is supplied to the reactor according to the reactive current set value.
  2. 根据权利要求1所述的高电压穿越控制方法，其特征在于，所述根据所述变流器的直流母线的电压特性、电网的电压特性和所述变流器的电抗器的感抗值，计算需要提供给所述电抗器的无功电流给定值，包括：The high voltage ride through control method according to claim 1, wherein said voltage characteristic of said DC bus of said converter, voltage characteristic of said power grid, and inductance of said reactor of said converter, Calculate the reactive current setpoints that need to be supplied to the reactor, including:
    利用以下公式，计算所述无功电流给定值：The reactive current setpoint is calculated using the following formula:
    Figure PCTCN2018085823-appb-100001
    Figure PCTCN2018085823-appb-100001
    其中，Iq为所述无功电流给定值，Udc Max为所述直流母线的最高工作电压，Kr为所述直流母线的电压利用率，
    Figure PCTCN2018085823-appb-100002
    为所述电网电压的正压分量的矢量幅值，ω为所述电网电压的角速度，L为所述电抗器的感抗值。     Wherein Iq is the reactive current set value, Udc Max is the highest working voltage of the DC bus, and Kr is the voltage utilization rate of the DC bus.
    Figure PCTCN2018085823-appb-100002
    Is the vector magnitude of the positive voltage component of the grid voltage, ω is the angular velocity of the grid voltage, and L is the inductive reactance value of the reactor.
  3. 根据权利要求1所述的高电压穿越控制方法，其特征在于，所述根据所述电网电压和所述变流器的额定电压，判定所述变流器的当前工作状态，包括：The high voltage ride through control method according to claim 1, wherein the determining the current working state of the converter according to the grid voltage and the rated voltage of the converter comprises:
    提取所述电网电压的正序分量；Extracting a positive sequence component of the grid voltage;
    计算所述电网电压的正序分量的矢量幅值
    Figure PCTCN2018085823-appb-100003
    Calculating the vector magnitude of the positive sequence component of the grid voltage
    Figure PCTCN2018085823-appb-100003
    对所述电网电压的正序分量的矢量幅值
    Figure PCTCN2018085823-appb-100004
    进行低通滤波处理，得到所述电网电压的正序分量的滤波处理后的矢量幅值
    Figure PCTCN2018085823-appb-100005
    以及     Vector magnitude of the positive sequence component of the grid voltage
    Figure PCTCN2018085823-appb-100004
    Performing a low-pass filtering process to obtain a filtered vector magnitude of the positive sequence component of the grid voltage
    Figure PCTCN2018085823-appb-100005
    as well as
    根据所述
    Figure PCTCN2018085823-appb-100006
    与所述变流器的额定电压，判定所述变流器的当前工作状态。     According to the
    Figure PCTCN2018085823-appb-100006
    The current operating state of the converter is determined with the rated voltage of the converter.
  4. 根据权利要求3所述的高电压穿越控制方法，其特征在于，所述根据所述
    Figure PCTCN2018085823-appb-100007
    与所述变流器的额定电压，判定所述变流器的当前工作状 态，包括：     The high voltage ride through control method according to claim 3, wherein said according to said
    Figure PCTCN2018085823-appb-100007
    Determining the current operating state of the converter with the rated voltage of the converter, including:
    将所述变流器的额定电压乘以预定上限因子，得到第一电压阈值，将所述变流器的额定电压乘以预定下限因子，得到第二电压阈值；Multiplying a rated voltage of the converter by a predetermined upper limit factor to obtain a first voltage threshold, multiplying a rated voltage of the converter by a predetermined lower limit factor to obtain a second voltage threshold;
    若所述
    Figure PCTCN2018085823-appb-100008
    大于所述第一电压阈值，且达到第一指定时间，则判定所述变流器进入所述高电压穿越模式；以及     If stated
    Figure PCTCN2018085823-appb-100008
    And greater than the first voltage threshold, and reaching a first specified time, determining that the converter enters the high voltage ride through mode;
    若所述
    Figure PCTCN2018085823-appb-100009
    小于所述第二电压阈值，且达到第二指定时间，则判定所述变流器退出所述高电压穿越模式。     If stated
    Figure PCTCN2018085823-appb-100009
    If the second voltage threshold is less than the second specified time, the converter is determined to exit the high voltage ride through mode.
  5. 根据权利要求1所述的高电压穿越控制方法，其特征在于，在所述根据所述无功电流给定值，向所述电抗器提供无功电流之后，所述高电压穿越控制方法还包括：The high voltage ride through control method according to claim 1, wherein after the reactive current is supplied to the reactor according to the reactive current set value, the high voltage ride through control method further includes :
    根据所述无功电流给定值，计算所述变流器的允许并入电网的有功电流裕量；以及Calculating an active current margin of the converter that is allowed to be integrated into the grid according to the reactive current set value;
    若所述变流器的有功电流容量大于所述有功电流裕量，则启动所述变流器的制动回路。If the active current capacity of the converter is greater than the active current margin, the brake circuit of the converter is activated.
  6. 根据权利要求5所述的高电压穿越控制方法，其特征在于，在所述根据所述无功电流给定值，计算所述变流器的允许并入电网的有功电流裕量之后，所述高电压穿越控制方法还包括：The high voltage ride through control method according to claim 5, wherein after calculating the active current margin of the converter that is allowed to be integrated into the grid according to the reactive current given value, The high voltage ride through control method also includes:
    若判定所述变流器退出所述高电压穿越模式，则控制所述有功电流裕量从当前值开始递增，直到达到所述变流器的最大工作电流；或者/并且If it is determined that the converter exits the high voltage ride-through mode, controlling the active current margin to increase from a current value until a maximum operating current of the converter is reached; or/and
    若判定所述变流器退出所述高电压穿越模式，则控制所述变流器的无功输出功率恢复到初始值，从所述初始值开始递增，直到达到所述变流器的无功功率需求值。If it is determined that the converter exits the high voltage ride-through mode, controlling the reactive output power of the converter to return to an initial value, starting from the initial value until reaching the reactive power of the converter Power demand value.
  7. 一种变流器的高电压穿越控制装置，其特征在于，包括：A high voltage ride through control device for a converter, comprising:
    电压监测单元，被配置为监测变流器网侧端的电网电压；a voltage monitoring unit configured to monitor a grid voltage at a side of the converter network;
    判定单元，被配置为根据所述电网电压和所述变流器的额定电压，判定所述变流器的当前工作状态；a determining unit configured to determine a current operating state of the converter according to the grid voltage and a rated voltage of the converter;
    计算单元，被配置为若判定所述变流器的当前工作状态为进入高电压穿越模式，则根据所述变流器的直流母线的电压特性、电网的电压特性和所述变流器的电抗器的感抗值，计算需要提供给所述电抗器的无功电流给 定值；以及a calculating unit configured to determine a voltage characteristic of the DC bus of the converter, a voltage characteristic of the power grid, and a reactance of the converter if it is determined that the current operating state of the converter is to enter a high voltage ride through mode The inductive value of the device, calculating the reactive current setpoint that needs to be supplied to the reactor;
    控制单元，被配置为根据所述无功电流给定值，向所述电抗器提供无功电流。And a control unit configured to provide a reactive current to the reactor according to the reactive current reference value.
  8. 根据权利要求7所述的高电压穿越控制装置，其特征在于，所述计算单元还被配置为利用以下公式，计算所述无功电流给定值：The high voltage ride through control device according to claim 7, wherein the calculation unit is further configured to calculate the reactive current reference value using the following formula:
    Figure PCTCN2018085823-appb-100010
    Figure PCTCN2018085823-appb-100010
    其中，Ip为所述无功电流给定值，Udc Max为所述直流母线的最高工作电压，Kr为所述直流母线的电压利用率，
    Figure PCTCN2018085823-appb-100011
    为所述电网电压的正压分量的矢量幅值，ω为所述电网电压的角速度，L为所述电抗器的感抗值。     Wherein Ip is the reactive current set value, Udc Max is the highest working voltage of the DC bus, and Kr is the voltage utilization rate of the DC bus.
    Figure PCTCN2018085823-appb-100011
    Is the vector magnitude of the positive voltage component of the grid voltage, ω is the angular velocity of the grid voltage, and L is the inductive reactance value of the reactor.
  9. 根据权利要求7所述的高电压穿越控制装置，其特征在于，所述判定单元包括：The high voltage ride through control device according to claim 7, wherein the determining unit comprises:
    提取子单元，被配置为提取所述电网电压的正序分量，并计算所述电网电压的正序分量的矢量幅值
    Figure PCTCN2018085823-appb-100012
    Extracting a subunit configured to extract a positive sequence component of the grid voltage and calculate a vector magnitude of a positive sequence component of the grid voltage
    Figure PCTCN2018085823-appb-100012
    滤波子单元，被配置为对所述电网电压的正序分量的矢量幅值
    Figure PCTCN2018085823-appb-100013
    进行低通滤波处理，得到所述电网电压的正序分量的滤波处理后的矢量幅值
    Figure PCTCN2018085823-appb-100014
    以及     a filtering subunit configured to vector magnitude of a positive sequence component of the grid voltage
    Figure PCTCN2018085823-appb-100013
    Performing a low-pass filtering process to obtain a filtered vector magnitude of the positive sequence component of the grid voltage
    Figure PCTCN2018085823-appb-100014
    as well as
    判定子单元，被配置为根据所述
    Figure PCTCN2018085823-appb-100015
    与所述变流器的额定电压，判定所述变流器的当前工作状态。     a determining subunit configured to be
    Figure PCTCN2018085823-appb-100015
    The current operating state of the converter is determined with the rated voltage of the converter.
  10. 根据权利要求9所述的高电压穿越控制装置，其特征在于，所述判定子单元还被配置为The high voltage ride through control device according to claim 9, wherein said determining subunit is further configured to
    将所述变流器的额定电压乘以预定上限因子，得到第一电压阈值，将所述变流器的额定电压乘以预定下限因子，得到第二电压阈值；Multiplying a rated voltage of the converter by a predetermined upper limit factor to obtain a first voltage threshold, multiplying a rated voltage of the converter by a predetermined lower limit factor to obtain a second voltage threshold;
    若所述
    Figure PCTCN2018085823-appb-100016
    大于所述第一电压阈值，且达到第一指定时间，则判定所述变流器进入所述高电压穿越模式；以及     If stated
    Figure PCTCN2018085823-appb-100016
    And greater than the first voltage threshold, and reaching a first specified time, determining that the converter enters the high voltage ride through mode;
    若所述
    Figure PCTCN2018085823-appb-100017
    小于所述第二电压阈值，且达到第二指定时间，则判定所述变流器退出所述高电压穿越模式。     If stated
    Figure PCTCN2018085823-appb-100017
    If the second voltage threshold is less than the second specified time, the converter is determined to exit the high voltage ride through mode.
  11. 根据权利要求7所述的高电压穿越控制装置，其特征在于，The high voltage ride through control device according to claim 7, wherein
    所述计算单元还被配置为根据所述无功电流给定值，计算所述变流器的允许并入电网的有功电流裕量；The computing unit is further configured to calculate an active current margin of the converter that is allowed to be incorporated into the grid based on the reactive current setpoint;
    所述控制单元还被配置为若所述变流器的有功电流容量大于所述有功电流裕量，则启动所述变流器的制动回路。The control unit is further configured to activate a brake circuit of the converter if the active current capacity of the converter is greater than the active current margin.
  12. 根据权利要求11所述的高电压穿越控制装置，其特征在于，所述控制单元还被配置为The high voltage ride through control device according to claim 11, wherein said control unit is further configured to
    若判定所述变流器退出所述高电压穿越模式，则控制所述有功电流裕量从当前值开始递增，直到达到所述变流器的最大工作电流；或者/并且If it is determined that the converter exits the high voltage ride-through mode, controlling the active current margin to increase from a current value until a maximum operating current of the converter is reached; or/and
    若判定所述变流器退出所述高电压穿越模式，则控制所述变流器的无功输出功率恢复到初始值，从所述初始值开始递增，直到达到所述变流器的无功功率需求值。If it is determined that the converter exits the high voltage ride-through mode, controlling the reactive output power of the converter to return to an initial value, starting from the initial value until reaching the reactive power of the converter Power demand value.
  13. 一种风力发电机组的变流器，其特征在于，所述变流器包括如权利要求7-12中任意一项所述的变流器的高电压穿越控制装置。A converter for a wind power generator, characterized in that the converter comprises a high voltage ride through control device of the converter according to any one of claims 7-12.
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