WO2014111034A1 - Method for starting flexible direct current transmission system - Google Patents

Method for starting flexible direct current transmission system Download PDF

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Publication number
WO2014111034A1
WO2014111034A1 PCT/CN2014/070756 CN2014070756W WO2014111034A1 WO 2014111034 A1 WO2014111034 A1 WO 2014111034A1 CN 2014070756 W CN2014070756 W CN 2014070756W WO 2014111034 A1 WO2014111034 A1 WO 2014111034A1
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Prior art keywords
voltage
converter
transmission system
flexible
direct current
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PCT/CN2014/070756
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French (fr)
Chinese (zh)
Inventor
李钢
田杰
董云龙
胡兆庆
李海英
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南京南瑞继保电气有限公司
南京南瑞继保工程技术有限公司
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Publication of WO2014111034A1 publication Critical patent/WO2014111034A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Definitions

  • the invention belongs to the technical field of flexible direct current transmission of power systems, and particularly relates to a starting method of a flexible direct current transmission system. Background technique
  • Flexible DC transmission uses a voltage source converter, which can independently and quickly control the active power and reactive power, thereby improving the stability of the system, suppressing system frequency and voltage fluctuations, and improving the steady state performance of the grid-connected AC system.
  • Flexible DC transmission has great advantages in the fields of new energy grid-connected, distributed generation grid-connected, island power supply, and urban distribution network power supply. Therefore, research on flexible DC transmission related technologies is of great significance.
  • the flexible DC transmission starts, firstly, the DC voltage station is controlled to be unlocked, and the unsteady DC voltage control station is unlocked when the DC voltage is the rated DC voltage. When unlocking, it will cause large voltage and current disturbance, which will cause the system to trip. Liang Haifeng, Wang Peng, etc.
  • Method 1 is not applicable to the system in which the isolation knives are installed on the DC side of the converter; in Equation 2, when the DC voltage controlled converter is unlocked according to the rated value, the overshoot of the controller will generate overvoltage, for modular multi-electricity An overcurrent will also occur when the flat converter unlocks another station.
  • Tang Guangfu, Kong Ming et al. “A method for starting a flexible multi-level converter flexible DC transmission system” (Patent Application Publication No.: CN 201110100456. 1 ), mentioning that one end AC system charges two stations of the passive system
  • the flexible DC system starting process is only applicable to the modular multi-level converter starting to the passive system, and the passive side converter will generate instantaneous overcurrent when unlocked. Summary of the invention
  • the object of the present invention is to provide a starting method of a flexible direct current power transmission system, which can avoid the overvoltage caused by controller overshoot during the unlocking process of the constant current voltage control converter by a simple sequential control operation, and effectively suppress The constant DC voltage controls the AC overcurrent generated when the inverter is unlocked, effectively suppressing the AC and DC overcurrent generated when the inverter is unlocked by the unregulated DC voltage.
  • a starting method of a flexible direct current transmission system includes two or more end voltage source type inverters connected by a direct current line, and the direct current side of the voltage source type inverter is connected to the isolation knife, and the alternating current The side is connected to the line switch via a set of parallel charging resistors and bypass switches; the starting method comprises the following steps:
  • the converter is to be connected to the pole
  • the DC voltage control converter DC voltage command is raised to the rated value according to the set rise and fall rate.
  • step (1) The specific content of the above step (1) is: The isolation knives on the DC side of the inverter are connected, and the DC side connection of each converter is completed; the pole connection operations of the inverters are in no particular order.
  • step (2) If the converter to be put into operation is connected to the active AC system, the converter is charged by sequentially switching the inverter inlet switch and the charging resistor bypass switch;
  • the flow device is connected to a passive AC system and is charged by a DC side or an auxiliary power source.
  • step (3) the buck is unlocked to control the DC voltage of the inverter, and the DC voltage command value is set to a rated DC voltage value greater than or equal to 0.5 times and less than 1. 0 times.
  • step (4) when the deviation between the DC voltage value and the DC voltage command value is less than 5% of the DC voltage command value, it is determined that the DC voltage is stable.
  • step (4) when the AC side of the non-constant DC voltage control inverter is an active system or a weak AC system, the inverter adopts a fixed active power control mode, and the active power command is 0.
  • step (4) when the AC side of the converter is not a fixed DC voltage control, the inverter adopts the passive control mode.
  • step (4) when used in a multi-terminal flexible direct current transmission system, a plurality of inverters controlled by a non-fixed DC voltage are respectively unlocked and then proceed to step (5).
  • the set lifting rate ranges from 0 to the maximum lifting rate, and the maximum lifting rate is limited by the stress limit of the converter, and the value ranges from 0 to infinity.
  • the beneficial effects of the present invention are: (1) The starting method of the flexible direct current transmission system provided by the invention avoids the overvoltage caused by the overshoot of the controller during the unlocking process of the constant current voltage control converter;
  • the starting method of the flexible direct current transmission system provided by the invention can effectively suppress the alternating current overcurrent generated when the constant current voltage is controlled to unlock the converter;
  • the starting method of the flexible direct current transmission system provided by the invention can effectively suppress the alternating current and direct current overcurrent generated when the inverter is unlocked by the undetermined DC voltage;
  • the starting method of the flexible direct current transmission system provided by the invention is suitable for the engineering application of the two-terminal and multi-terminal flexible direct current transmission system, and the operation is simple and the control is effective.
  • FIG. 1 is a schematic structural view of a flexible DC transmission system at both ends of the present invention
  • FIG. 2 is a flow chart of the present invention. detailed description
  • the invention provides a starting method of a flexible direct current power transmission system, which effectively suppresses excessive voltage and current disturbance generated during the starting process of the flexible direct current system by simple sequential control operation, and includes the following implementation steps:
  • the inverter is charged by sequentially connecting the inverter inlet switch and the bypass switch of the charging resistor; if the converter is to be operated and not The source AC system is connected, charged by the DC side, or charged by the auxiliary power source;
  • 5 ⁇ rating of the rated voltage is greater than or equal to 0. 5 times and less than 1. 0 times the rated value of the DC voltage.
  • the DC voltage is stable (meaning that the deviation between the DC voltage value and the DC voltage command value is less than 5% of the DC voltage command value), after the non-fixed DC voltage control inverter is unlocked, if used in a multi-terminal flexible DC transmission system,
  • the multiple inverters controlled by the DC voltage are respectively unlocked, and all the converters to be operated are unlocked before entering the step (5); if the AC side of the inverter is not the active system or the weak AC system, The converter adopts a fixed active power control mode, and the active power command is 0; the non-fixed DC voltage control inverter has an AC side as a passive system, and the inverter adopts a passive control mode;
  • the DC voltage command of the constant DC voltage control converter is raised to the rated value according to the set lifting rate.
  • the lifting speed ranges from 0 to the maximum lifting.
  • the rate, the maximum rate of rise and fall is constrained by the stress limit of the inverter, and ranges from
  • the flexible direct current transmission system comprises two or more ends (three or more) voltage source type inverters connected by a direct current line, and the DC side of the voltage source type inverter is connected to the isolation knife, the alternating current side
  • the line switch is connected via a set of parallel charging resistors and bypass switches.
  • the wiring mode of the flexible DC transmission system at both ends is shown in Figure 1.
  • the two converter stations (station 1, station 2) of the flexible DC transmission system at both ends have the same topological structure, including the AC side incoming line switch Ql, the converter transformer, Parallel connection of charging resistor and charging resistor bypass switch Q2, voltage source converter and DC side isolation knife gate QS1, QS2 o DC side isolation knife gates QS1, QS2 of the two stations before the start of the flexible DC transmission system
  • Both the side inlet switch Q1 and the charging resistor bypass switch Q2 are in the divided position.
  • the pole connection operation is first performed on station 1 and station 2, and the pole connection operation of station 1 and station 2 is not required in sequence.
  • the pole connection operation of station 1 is the DC side isolation knife gate QS1 and QS2 of the station 1
  • the pole connection operation of the station 2 is the DC side isolation knife gate of the station 2 QS1, QS2 o
  • the setting station 1 adopts the constant DC voltage control mode, the DC voltage command value is 0.5 times the rated DC voltage value, and the station 1 converter adopts the fixed reactive power mode, the reactive command value is 0, and the station 1 is unlocked.
  • the setting station 2 adopts the fixed active power control mode (non-fixed DC voltage control mode) and the reactive power control mode.
  • the active and reactive power command values are all 0, and the station 2 is unlocked.
  • the voltage rise rate of the input station 1 is 100KV/min, and the target DC voltage value of the input station 1 is the rated value.
  • the DC voltage will rise to the rated value according to the set rise and fall rate to complete the starting process of the flexible DC transmission system.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Inverter Devices (AREA)

Abstract

A method for starting a flexible direct current transmission system. The flexible direct current transmission system comprises a two-end or multi-end voltage source transverter (site 1 or site 2) connected by means of a direct-current circuit, a direct current side of the voltage source transverter is connected to an isolation knife switch (QS1 and QS2), and an alternating current side is connected to a wire-inlet switch (Q1) by using a group of charging resistors and a bypass switch (Q2) in parallel connection. The starting method comprises the following steps: connecting electrodes of transverters; charging the transverters; performing voltage reduction on and unlocking a fixed direct current voltage control transverter, and establishing direct current voltage; unlocking a non-direct-current voltage control transverter; and after the unlocking is completed, increasing an direct current voltage instruction of the fixed direct current voltage control transverter to a rated value according to set increasing and decreasing rate. The method can void overvoltage caused by controller overshooting in the unlocking process of the fixed direct current voltage control transverter, effectively suppress alternating current over-current generated during unlocking of the fixed direct current voltage control transverter, and effectively suppresses alternating and direct current overcurrent generated during the unlocking process of the non-fixed direct current voltage control transverter.

Description

一种柔性直流输电系统的起动方法  Starting method of flexible direct current transmission system
技术领域 Technical field
本发明属于电力系统柔性直流输电技术领域， 具体涉及一种柔性直流输电系统的起 动方法。 背景技术  The invention belongs to the technical field of flexible direct current transmission of power systems, and particularly relates to a starting method of a flexible direct current transmission system. Background technique
柔性直流输电采用电压源型换流器， 可以独立、 快速控制控制有功功率和无功功率， 从而提高系统的稳定性， 抑制系统频率和电压的波动， 提高并网交流系统的稳态性能。 柔性直流输电在新能源并网、 分布式发电并网、 孤岛供电、 城市配网供电等领域具有较 大的优势， 因此柔性直流输电相关技术的研究具有重要的意义。  Flexible DC transmission uses a voltage source converter, which can independently and quickly control the active power and reactive power, thereby improving the stability of the system, suppressing system frequency and voltage fluctuations, and improving the steady state performance of the grid-connected AC system. Flexible DC transmission has great advantages in the fields of new energy grid-connected, distributed generation grid-connected, island power supply, and urban distribution network power supply. Therefore, research on flexible DC transmission related technologies is of great significance.
对于实际运行的柔性直流输电工程， 由于受到一次设备的限制， 直流系统起动时的 电压、 电流扰动需限制在一定的范围内， 否则将损坏一次设备。 目前柔性直流输电起动， 首先控制直流电压站解锁， 非定直流电压控制站在直流电压为额定直流电压时解锁。 解 锁时会造成会引起较大电压、 电流扰动， 容易引起系统跳闸。 梁海峰， 王鹏等人的 For the actual operation of the flexible DC transmission project, due to the limitation of the primary equipment, the voltage and current disturbances during the startup of the DC system should be limited to a certain range, otherwise the primary equipment will be damaged. At present, the flexible DC transmission starts, firstly, the DC voltage station is controlled to be unlocked, and the unsteady DC voltage control station is unlocked when the DC voltage is the rated DC voltage. When unlocking, it will cause large voltage and current disturbance, which will cause the system to trip. Liang Haifeng, Wang Peng, etc.
"VSC-HVDC系统起动过程控制及仿真"（华北电力大学学报， 2006， 33 ( 2)， 79〜82 )提 及了两种柔性直流输电系统的起动方法： 断开一端换流器与直流线路的连接， 两端换流 器均使用定直流电压方式建立直流电压至额定值， 连接断开的换流器至直流线路并切换 为定直流电流控制方式 （下述方法 1 ); 一端换流器以定直流电压方式解锁至额定值后解 锁另一端换流器 （下述方法 2)。 方法 1对于换流器直流侧装设隔离刀间的系统不适用； 方法 2中按照额定值解锁定直流电压控制的换流器时因为控制器的超调会产生过电压， 对于模块化多电平换流器解锁另一站时还会出现过电流。 汤广福， 孔明等人的 "一种模 块化多电平换流器柔性直流输电系统的起动方法" （专利申请公布号： CN 201110100456. 1 )， 提及了一端交流系统向无源系统两站充电的柔性直流系统起动过程， 该方法只适用于模块化多电平换流器向无源系统起动， 且无源侧换流器解锁时会产生瞬 时的过电流。 发明内容 "Starting Process Control and Simulation of VSC-HVDC System" (Journal of North China Electric Power University, 2006, 33 (2), 79~82) refers to the starting method of two flexible DC transmission systems: Disconnect one end converter and DC line The connection, both ends of the converter use a constant DC voltage to establish the DC voltage to the rated value, connect the disconnected converter to the DC line and switch to the constant DC current control mode (method 1 below); one end converter After unlocking to the rated value with a constant DC voltage, unlock the other end of the inverter (Method 2 below). Method 1 is not applicable to the system in which the isolation knives are installed on the DC side of the converter; in Equation 2, when the DC voltage controlled converter is unlocked according to the rated value, the overshoot of the controller will generate overvoltage, for modular multi-electricity An overcurrent will also occur when the flat converter unlocks another station. Tang Guangfu, Kong Ming et al. "A method for starting a flexible multi-level converter flexible DC transmission system" (Patent Application Publication No.: CN 201110100456. 1 ), mentioning that one end AC system charges two stations of the passive system The flexible DC system starting process is only applicable to the modular multi-level converter starting to the passive system, and the passive side converter will generate instantaneous overcurrent when unlocked. Summary of the invention
本发明的目的， 在于提供一种柔性直流输电系统的起动方法， 其通过简单的顺序控 制操作，可以避免定直流电压控制换流器解锁过程中控制器超调引起的过电压，有效抑制 定直流电压控制换流器解锁时产生的交流过电流， 有效抑制非定直流电压控制换流器解 锁时产生的交流和直流过电流。 The object of the present invention is to provide a starting method of a flexible direct current power transmission system, which can avoid the overvoltage caused by controller overshoot during the unlocking process of the constant current voltage control converter by a simple sequential control operation, and effectively suppress The constant DC voltage controls the AC overcurrent generated when the inverter is unlocked, effectively suppressing the AC and DC overcurrent generated when the inverter is unlocked by the unregulated DC voltage.
为了达成上述目的， 本发明采用的技术方案是：  In order to achieve the above object, the technical solution adopted by the present invention is:
一种柔性直流输电系统的起动方法， 所述柔性直流输电系统包括借助直流线路连接 的两端或多端电压源型换流器， 所述的电压源型换流器直流侧连接隔离刀间， 交流侧经 由一组并联的充电电阻和旁路开关连接进线开关； 所述的起动方法包括如下步骤：  A starting method of a flexible direct current transmission system, the flexible direct current transmission system includes two or more end voltage source type inverters connected by a direct current line, and the direct current side of the voltage source type inverter is connected to the isolation knife, and the alternating current The side is connected to the line switch via a set of parallel charging resistors and bypass switches; the starting method comprises the following steps:
( 1 ) 待投运换流器极连接；  (1) The converter is to be connected to the pole;
( 2) 待投运换流器充电；  (2) The converter to be operated is charged;
( 3) 定直流电压控制换流器降压解锁， 建立直流电压；  (3) The DC voltage control inverter is stepped down to unlock and establish a DC voltage;
(4) 直流电压稳定后， 非定直流电压控制换流器解锁；  (4) After the DC voltage is stabilized, the non-fixed DC voltage control inverter is unlocked;
( 5)所有非定直流电压控制换流器解锁完成后， 定直流电压控制换流器直流电压指 令按照设定的升降速率升高至额定值。  (5) After all undefined DC voltage control converters are unlocked, the DC voltage control converter DC voltage command is raised to the rated value according to the set rise and fall rate.
上述步骤（1 ) 的具体内容是： 合换流器直流侧的隔离刀间， 完成各换流器直流侧连 接； 各换流器的极连接操作不分先后。  The specific content of the above step (1) is: The isolation knives on the DC side of the inverter are connected, and the DC side connection of each converter is completed; the pole connection operations of the inverters are in no particular order.
上述步骤（2) 的具体内容是： 若待投运换流器与有源交流系统连接， 通过依次合换 流器进线开关和充电电阻旁路开关完成换流器充电； 若待投运换流器与无源交流系统连 接， 通过直流侧或辅助电源充电。  The specific content of the above step (2) is: If the converter to be put into operation is connected to the active AC system, the converter is charged by sequentially switching the inverter inlet switch and the charging resistor bypass switch; The flow device is connected to a passive AC system and is charged by a DC side or an auxiliary power source.
上述步骤（3) 中， 降压解锁为控制换流器的直流电压， 直流电压指令值整定范围为 大于等于 0. 5倍且小于 1. 0倍的额定直流电压值。  In the above step (3), the buck is unlocked to control the DC voltage of the inverter, and the DC voltage command value is set to a rated DC voltage value greater than or equal to 0.5 times and less than 1. 0 times.
上述步骤（4)中， 当直流电压值与直流电压指令值的偏差小于直流电压指令值的 5% 时， 判定直流电压稳定。  In the above step (4), when the deviation between the DC voltage value and the DC voltage command value is less than 5% of the DC voltage command value, it is determined that the DC voltage is stable.
上述步骤 （4) 中， 非定直流电压控制换流器的交流侧为有源系统或弱交流系统时， 换流器采用定有功功率控制方式， 有功功率指令为 0。  In the above step (4), when the AC side of the non-constant DC voltage control inverter is an active system or a weak AC system, the inverter adopts a fixed active power control mode, and the active power command is 0.
上述步骤（4) 中， 非定直流电压控制换流器的交流侧为无源系统时， 换流器采用无 源控制方式。  In the above step (4), when the AC side of the converter is not a fixed DC voltage control, the inverter adopts the passive control mode.
上述步骤（4) 中， 用于多端柔性直流输电系统时， 非定直流电压控制的多个换流器 分别解锁后再进入步骤 （5)。  In the above step (4), when used in a multi-terminal flexible direct current transmission system, a plurality of inverters controlled by a non-fixed DC voltage are respectively unlocked and then proceed to step (5).
上述步骤（5) 中， 设定的升降速率取值范围为 0至最大升降速率， 所述最大升降速 率受换流器的应力限制约束， 取值范围为 0至无穷大。  In the above step (5), the set lifting rate ranges from 0 to the maximum lifting rate, and the maximum lifting rate is limited by the stress limit of the converter, and the value ranges from 0 to infinity.
采用上述方案后， 本发明的有益效果为： ( 1 )本发明提供的柔性直流输电系统的起动方法， 避免了定直流电压控制换流器解 锁过程中控制器超调引起的过电压； After adopting the above scheme, the beneficial effects of the present invention are: (1) The starting method of the flexible direct current transmission system provided by the invention avoids the overvoltage caused by the overshoot of the controller during the unlocking process of the constant current voltage control converter;
( 2 )本发明提供的柔性直流输电系统的起动方法， 可以有效抑制定直流电压控制换 流器解锁时产生的交流过电流；  (2) The starting method of the flexible direct current transmission system provided by the invention can effectively suppress the alternating current overcurrent generated when the constant current voltage is controlled to unlock the converter;
( 3 )本发明提供的柔性直流输电系统的起动方法， 可以有效抑制非定直流电压控制 换流器解锁时产生的交流和直流过电流；  (3) The starting method of the flexible direct current transmission system provided by the invention can effectively suppress the alternating current and direct current overcurrent generated when the inverter is unlocked by the undetermined DC voltage;
( 4)本发明提供的柔性直流输电系统的起动方法， 适合两端及多端柔性直流输电系 统的工程应用， 操作简单， 控制有效。 附图说明  (4) The starting method of the flexible direct current transmission system provided by the invention is suitable for the engineering application of the two-terminal and multi-terminal flexible direct current transmission system, and the operation is simple and the control is effective. DRAWINGS
图 1 是本发明中两端柔性直流输电系统的结构示意图；  1 is a schematic structural view of a flexible DC transmission system at both ends of the present invention;
图 2 是本发明的流程图。 具体实施方式  Figure 2 is a flow chart of the present invention. detailed description
以下将结合附图及具体实施例， 对本发明的技术方案进行详细说明。  The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
本发明提供一种柔性直流输电系统的起动方法，其通过简单的顺序控制操作，有效抑 制柔性直流系统起动过程中产生的过大的电压电流扰动， 包括如下实施步骤：  The invention provides a starting method of a flexible direct current power transmission system, which effectively suppresses excessive voltage and current disturbance generated during the starting process of the flexible direct current system by simple sequential control operation, and includes the following implementation steps:
( 1 )待投运换流器极连接：合换流器直流侧的隔离刀间，完成各换流器直流侧连接; 各换流器的极连接操作不分先后；  (1) The inverter connection to be put into operation: the isolation knife between the DC side of the inverter is completed, and the DC side connection of each converter is completed; the pole connection operation of each converter is in no particular order;
( 2 )若待投运换流器与有源交流系统连接， 通过依次合换流器进线开关和充电电阻 的旁路开关来完成换流器的充电； 若待投运换流器与无源交流系统连接， 通过直流侧充 电， 或通过辅助电源充电；  (2) If the converter to be put into operation is connected to the active AC system, the inverter is charged by sequentially connecting the inverter inlet switch and the bypass switch of the charging resistor; if the converter is to be operated and not The source AC system is connected, charged by the DC side, or charged by the auxiliary power source;
( 3 )定直流电压控制换流器降压解锁， 建立直流电压； 具体是控制换流器的直流电 压， 直流电压指令值的整定范围为大于等于 0. 5倍且小于 1. 0倍的额定直流电压值； 5倍的以下的 rating of the rated voltage is greater than or equal to 0. 5 times and less than 1. 0 times the rated value of the DC voltage. DC voltage value;
( 4)直流电压稳定（指直流电压值与直流电压指令值的偏差小于直流电压指令值的 5%) 后， 非定直流电压控制换流器解锁， 若用于多端柔性直流输电系统， 非定直流电压 控制的多个换流器分别解锁， 完成所有待投运的换流器解锁后再进入步骤 （5 ); 若非定 直流电压控制换流器的交流侧为有源系统或弱交流系统， 换流器采用定有功功率控制方 式， 有功功率指令为 0; 所述非定直流电压控制换流器的交流侧为无源系统， 换流器采用 无源控制方式； ( 5 )所有非定直流电压控制换流器解锁完成后， 定直流电压控制换流器直流电压指 令按照设定的升降速率升高至额定值， 该升降速率的取值范围为 0至最大升降速率， 所 述最大升降速率受换流器的应力限制约束， 取值范围为 0至无穷大。 (4) The DC voltage is stable (meaning that the deviation between the DC voltage value and the DC voltage command value is less than 5% of the DC voltage command value), after the non-fixed DC voltage control inverter is unlocked, if used in a multi-terminal flexible DC transmission system, The multiple inverters controlled by the DC voltage are respectively unlocked, and all the converters to be operated are unlocked before entering the step (5); if the AC side of the inverter is not the active system or the weak AC system, The converter adopts a fixed active power control mode, and the active power command is 0; the non-fixed DC voltage control inverter has an AC side as a passive system, and the inverter adopts a passive control mode; (5) After all the unregulated DC voltage control converters are unlocked, the DC voltage command of the constant DC voltage control converter is raised to the rated value according to the set lifting rate. The lifting speed ranges from 0 to the maximum lifting. The rate, the maximum rate of rise and fall is constrained by the stress limit of the inverter, and ranges from 0 to infinity.
本发明所涉及的柔性直流输电系统， 包括借助直流线路连接的两端或多端 （三端以 上） 电压源型换流器， 所述电压源型换流器的直流侧连接隔离刀间， 交流侧经由一组并 联的充电电阻和旁路开关连接进线开关。  The flexible direct current transmission system according to the present invention comprises two or more ends (three or more) voltage source type inverters connected by a direct current line, and the DC side of the voltage source type inverter is connected to the isolation knife, the alternating current side The line switch is connected via a set of parallel charging resistors and bypass switches.
按照本发明中的起动方法， 以下将以两端柔性直流输电系统为例， 对起动过程实现 方式进行说明。  According to the starting method in the present invention, the implementation of the starting process will be described below by taking a flexible DC transmission system at both ends as an example.
两端柔性直流输电系统的接线方式如图 1所示， 两端柔性直流输电系统的两个换流 站（站 1、 站 2 )拓扑结构相同， 包括交流侧进线开关 Ql， 换流变压器， 相互并联的充电 电阻和充电电阻旁路开关 Q2、 电压源型换流器以及直流侧隔离刀闸 QS1、 QS2 o 两端柔性 直流输电系统起动前两站的直流侧隔离刀闸 QS1、 QS2,交流侧进线开关 Q1和充电电阻旁 路开关 Q2都处于分位。  The wiring mode of the flexible DC transmission system at both ends is shown in Figure 1. The two converter stations (station 1, station 2) of the flexible DC transmission system at both ends have the same topological structure, including the AC side incoming line switch Ql, the converter transformer, Parallel connection of charging resistor and charging resistor bypass switch Q2, voltage source converter and DC side isolation knife gate QS1, QS2 o DC side isolation knife gates QS1, QS2 of the two stations before the start of the flexible DC transmission system Both the side inlet switch Q1 and the charging resistor bypass switch Q2 are in the divided position.
按照图 2提供的具体起动操作流程，首先对站 1和站 2进行极连接操作，站 1和站 2 的极连接操作无先后顺序要求。站 1的极连接操作为合站 1的直流侧隔离刀闸 QS1、 QS2, 站 2的极连接操作为合站 2的直流侧隔离刀闸 QS1、 QS2 o  According to the specific starting operation flow provided in Figure 2, the pole connection operation is first performed on station 1 and station 2, and the pole connection operation of station 1 and station 2 is not required in sequence. The pole connection operation of station 1 is the DC side isolation knife gate QS1 and QS2 of the station 1, and the pole connection operation of the station 2 is the DC side isolation knife gate of the station 2 QS1, QS2 o
分别合站 1和站 2的交流侧进线开关 Ql， 待直流电压稳定后继续分别合站 1和站 2 的充电电阻旁路开关 Q2， 待直流电压稳定后站 1和站 2的换流器均充电完成。  Connect the AC side incoming line switch Q1 of station 1 and station 2 respectively, and continue to charge the bypass switch Q2 of station 1 and station 2 respectively after the DC voltage is stabilized, and the inverter of station 1 and station 2 after the DC voltage is stabilized. All charging is completed.
设定站 1采用定直流电压控制方式，直流电压指令值为 0. 5倍额定直流电压值，站 1 换流器采用定无功功率方式， 无功指令值为 0， 站 1解锁。  The setting station 1 adopts the constant DC voltage control mode, the DC voltage command value is 0.5 times the rated DC voltage value, and the station 1 converter adopts the fixed reactive power mode, the reactive command value is 0, and the station 1 is unlocked.
设定站 2采用定有功功率控制方式（非定直流电压控制方式）和无功功率控制方式， 有功、 无功功率指令值均为 0， 站 2解锁。  The setting station 2 adopts the fixed active power control mode (non-fixed DC voltage control mode) and the reactive power control mode. The active and reactive power command values are all 0, and the station 2 is unlocked.
站 2解锁完成后，输入站 1的电压升降速率为 100KV/min，输入站 1的目标直流电压 值为额定值。 直流电压将按照设定的升降速率升至额定值， 完成柔性直流输电系统的起 动过程。  After the station 2 is unlocked, the voltage rise rate of the input station 1 is 100KV/min, and the target DC voltage value of the input station 1 is the rated value. The DC voltage will rise to the rated value according to the set rise and fall rate to complete the starting process of the flexible DC transmission system.
以上实施例仅为说明本发明的技术思想， 不能以此限定本发明的保护范围， 凡是按 照本发明提出的技术思想， 在技术方案基础上所做的任何改动， 均落入本发明保护范围 之内。  The above embodiments are only for explaining the technical idea of the present invention, and the scope of protection of the present invention is not limited thereto. Any changes made based on the technical solutions according to the technical idea of the present invention fall within the protection scope of the present invention. Inside.

Claims

权利要求书 claims
1、 一种柔性直流输电系统的起动方法， 其特征在于： 所述柔性直流输电系统包括借 助直流线路连接的两端或多端电压源型换流器， 所述的电压源型换流器直流侧连接隔离 刀闸， 交流侧经由一组并联的充电电阻和旁路开关连接进线开关； 所述的起动方法包括 如下步骤： 1. A starting method for a flexible DC transmission system, characterized in that: the flexible DC transmission system includes a two-terminal or multi-terminal voltage source converter connected by a DC line, and the DC side of the voltage source converter Connect the isolation knife switch, and the AC side is connected to the incoming line switch through a set of parallel charging resistors and bypass switches; the starting method includes the following steps:
( 1 ) 待投运换流器极连接； (1) Pole connection of the converter to be put into operation;
( 2) 待投运换流器充电； (2) Charging the inverter to be put into operation;
( 3) 定直流电压控制换流器降压解锁， 建立直流电压； (3) The constant DC voltage controls the voltage reduction and unlocking of the converter to establish the DC voltage;
(4) 直流电压稳定后， 非定直流电压控制换流器解锁； (4) After the DC voltage stabilizes, the non-constant DC voltage controls the inverter to unlock;
( 5 ) 所有非定直流电压控制换流器解锁完成后， 定直流电压控制换流器直流电压指 令按照设定的升降速率升高至额定值。 (5) After all non-constant DC voltage controlled converters are unlocked, the DC voltage command of the constant DC voltage controlled converters increases to the rated value according to the set rise and fall rate.
2、 如权利要求 1 所述的一种柔性直流输电系统的起动方法， 其特征在于： 所述步骤 2. A starting method for a flexible DC transmission system as claimed in claim 1, characterized in that: the steps
( 1 ) 的具体内容是： 合换流器直流侧的隔离刀间， 完成各换流器直流侧连接； 各换流器 的极连接操作不分先后。 The specific content of (1) is: close the isolation knife room on the DC side of the converter to complete the DC side connection of each converter; the pole connection operations of each converter are done in no particular order.
3、 如权利要求 1 所述的一种柔性直流输电系统的起动方法， 其特征在于： 所述步骤 3. A starting method for a flexible DC transmission system as claimed in claim 1, characterized in that: the steps
( 2 ) 的具体内容是： 若待投运换流器与有源交流系统连接， 通过依次合换流器进线开关 和充电电阻旁路开关完成换流器充电； 若待投运换流器与无源交流系统连接， 通过直流 侧或辅助电源充电。 The specific content of (2) is: If the converter to be put into operation is connected to the active AC system, charging of the converter is completed by sequentially closing the incoming line switch of the converter and the charging resistor bypass switch; Connected to passive AC systems, charged via DC side or auxiliary power supply.
4、 如权利要求 1 所述的一种柔性直流输电系统的起动方法， 其特征在于： 所述步骤 4. A starting method for a flexible DC transmission system as claimed in claim 1, characterized in that: the steps
( 3 ) 中， 降压解锁为控制换流器的直流电压， 直流电压指令值整定范围为大于等于 0. 5 倍且小于 1. 0倍的额定直流电压值。 In (3), the step-down unlocking is to control the DC voltage of the converter, and the setting range of the DC voltage command value is greater than or equal to 0.5 times and less than 1.0 times the rated DC voltage value.
5、 如权利要求 1 所述的一种柔性直流输电系统的起动方法， 其特征在于： 所述步骤 5. A starting method for a flexible DC transmission system as claimed in claim 1, characterized in that: the steps
(4) 中， 当直流电压值与直流电压指令值的偏差小于直流电压指令值的 5%时， 判定直流 电压稳定。 In (4), when the deviation between the DC voltage value and the DC voltage command value is less than 5% of the DC voltage command value, the DC voltage is determined to be stable.
6、 如权利要求 1 所述的一种柔性直流输电系统的起动方法， 其特征在于： 所述步骤 (4) 中， 非定直流电压控制换流器的交流侧为有源系统或弱交流系统时， 换流器采用定 有功功率控制方式， 有功功率指令为 0。 6. The starting method of a flexible DC transmission system according to claim 1, characterized in that: in the step (4), the AC side of the non-constant DC voltage control converter is an active system or a weak AC system. When , the converter adopts constant active power control mode, and the active power command is 0.
7、 如权利要求 1 所述的一种柔性直流输电系统的起动方法， 其特征在于： 所述步骤 (4) 中， 非定直流电压控制换流器的交流侧为无源系统时， 换流器采用无源控制方式。 7. A starting method for a flexible DC transmission system as claimed in claim 1, characterized in that: in step (4), when the AC side of the non-constant DC voltage controlled converter is a passive system, the commutation The device adopts passive control mode.
8、 如权利要求 1 所述的一种柔性直流输电系统的起动方法， 其特征在于： 所述步骤 (4) 中， 用于多端柔性直流输电系统时， 非定直流电压控制的多个换流器分别解锁后再 进入步骤 （5)。 8. The starting method of a flexible DC transmission system according to claim 1, characterized in that: the steps In (4), when used in a multi-terminal flexible DC transmission system, multiple converters controlled by non-constant DC voltages are unlocked respectively before entering step (5).
9、 如权利要求 1 所述的一种柔性直流输电系统的起动方法， 其特征在于： 所述步骤 9. A starting method for a flexible DC transmission system as claimed in claim 1, characterized in that: the steps
( 5) 中， 设定的升降速率取值范围为 0 至最大升降速率， 所述最大升降速率受换流器的 应力限制约束， 取值范围为 0至无穷大。 In (5), the set lifting rate ranges from 0 to the maximum lifting rate. The maximum lifting rate is constrained by the stress limit of the converter, and the value range is from 0 to infinity.
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