WO2016091060A1 - 一种孤岛状态下抑制多个换流站进入无源控制模式的方法 - Google Patents

一种孤岛状态下抑制多个换流站进入无源控制模式的方法 Download PDF

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WO2016091060A1
WO2016091060A1 PCT/CN2015/095373 CN2015095373W WO2016091060A1 WO 2016091060 A1 WO2016091060 A1 WO 2016091060A1 CN 2015095373 W CN2015095373 W CN 2015095373W WO 2016091060 A1 WO2016091060 A1 WO 2016091060A1
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Prior art keywords
converter
station
converter station
stations
passive control
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PCT/CN2015/095373
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English (en)
French (fr)
Inventor
董云龙
田杰
曹冬明
李海英
丁久东
胡兆庆
李钢
刘海彬
卢宇
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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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Application filed by 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 filed Critical 南京南瑞继保电气有限公司
Priority to KR1020177014860A priority Critical patent/KR101929542B1/ko
Priority to CA2970119A priority patent/CA2970119C/en
Priority to DK15868517.2T priority patent/DK3211741T3/da
Priority to RU2017117644A priority patent/RU2678429C2/ru
Priority to US15/533,560 priority patent/US10218184B2/en
Priority to EP15868517.2A priority patent/EP3211741B1/en
Publication of WO2016091060A1 publication Critical patent/WO2016091060A1/zh
Priority to CY20191100647T priority patent/CY1121769T1/el

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network

Definitions

  • the invention belongs to the field of flexible direct current transmission, and particularly relates to a method for suppressing multiple converter stations from entering a passive control mode in an island state.
  • the flexible DC transmission system can supply power to the user load together with the AC system to improve the power supply capacity and power supply reliability.
  • the user load is shared by the AC transmission system and the flexible DC transmission system.
  • the flexible DC transmission system is in the active control mode.
  • an island is formed. If there is only one converter station in the island. Then, the converter station is in a passive control mode, and can independently supply power to the user without relying on the AC system. If the island contains multiple converter stations, then one of the converter stations can be selected to enter the passive control mode. The island's AC voltage is established, while other converter stations are still in active control mode. If the AC line inside the island fails again and multiple islands are formed, one of the newly formed islands enters the passive control mode to establish a new island-forming AC voltage.
  • the object of the present invention is to provide a method for suppressing multiple converter stations from entering a passive control mode in an island state, which can prevent multiple converter stations in the same island from being in a passive control mode at the same time, thereby avoiding multiple exchanges.
  • the output voltage of the flow station is not synchronized and the overcurrent damages the converter valve.
  • the principle of grouping the converter stations is to divide the converter stations connected by the AC line into a group under normal operation.
  • the principle of setting the relevant fixed values of the islanding detection of each converter station is that the more sensitive the correlation value of the converter station is, the more sensitive the corresponding converter station is to detect the island state.
  • the converter station that detects the island state needs to pass the permission signal when all the other converter stations in the group with higher priority than the converter station can enter the passive control mode.
  • the other allowed converters in the group with higher priority than the converter station are allowed to be divided into the following situations:
  • the converter station has no station-to-station communication with other converter stations in the group with higher priority than the converter station;
  • the converter station has inter-station communication with other converter stations of the priority high-voltage converter station in the group, and other converter stations in the group with higher priority than the converter station are not in passive control. mode;
  • the converter station has inter-station communication with other converter stations in the group with higher priority than the converter station, and other converter stations in the group with higher priority than the converter station enter passive control. Mode and delay t time, where 0 ⁇ t ⁇ 10 seconds.
  • Figure 1 is a typical system topology of a flexible HVDC transmission system.
  • 01 indicates AC line one
  • 02 indicates AC line two
  • 03 indicates user load one
  • 04 indicates user load two
  • 05 indicates AC system
  • 06 indicates converter station zero.
  • 07 indicates the converter station one
  • 08 indicates the converter station two
  • 09 indicates the DC transmission line
  • 10 indicates the flexible DC transmission system
  • 11 indicates the island one
  • 12 indicates the island 2, and 13 indicates the island three;
  • FIG. 2 is a logic diagram of suppressing multiple converter stations from entering a passive control mode in an island state.
  • ISO_STATE indicates that the converter station detects an island state
  • S1 to Sn indicate that the same group with the current converter station has a higher priority.
  • TCOM_NOK_Sx indicates that there is no station-to-station communication between the converter station and the same group with higher priority than the other converter stations of this converter station
  • TO_PAS_MODE indicates that the converter station enters the passive control mode command.
  • the invention provides a method for suppressing a plurality of converter stations from entering a passive control mode in an island state, which is grouped by pre-combining the converter stations, and the principle of grouping is the converter station connected by the AC line under normal operation. Divided into a group, each group presets the priority of each converter station to set the relevant fixed value of the island detection of each converter station.
  • the setting principle is that the higher the priority, the more sensitive the relevant value of the converter station is. The easier it is for the converter station to detect the island status.
  • the converter station that detects the island state needs to pass the permission signal when all the other converter stations in the group with higher priority than the converter station can enter the passive control mode.
  • the other allowed converters in the group with higher priority than the converter station are allowed to be divided into the following situations:
  • the converter station has no station-to-station communication with other converter stations in the group with higher priority than the converter station;
  • the converter station has inter-station communication with other converter stations of the priority high-voltage converter station in the group, and other converter stations in the group with higher priority than the converter station are not in passive control. mode;
  • the converter station has inter-station communication with other converter stations in the group with higher priority than the converter station, and other converter stations in the group with higher priority than the converter station enter passive control. Mode and delay t time, where 0 ⁇ t ⁇ 10 seconds.
  • Figure 1 is a typical system topology of a flexible HVDC transmission system.
  • the 05 AC system and the 10 flexible DC transmission system jointly supply 03 user load 1 and 04 user load 2, 06 converter station zero, 07 converter station And 08 converter station two are connected by AC line, after grouping the three in the same group, are in active control mode, wherein 06 converter station zero is DC voltage control station, power balance function, 07 converter station and 08 converter station 2 is the power control station, and supplies power to the 03 user load one and the 04 user load two.
  • the priority of the three converter stations is from high to low, 06 commutation station, 07 commutation station, and 08 exchange.
  • Stream station two is from high to low, 06 commutation station, 07 commutation station, and 08 exchange.
  • the 07 converter station detects the island state and receives the 06 commutation station zero in the active control mode through the inter-station communication.
  • the 07 converter station immediately enters the passive control mode to maintain the magnitude and frequency of the AC voltage.
  • the converter station 2 does not detect the island state and receives the 07 converter station through the inter-station communication.
  • the inverter station 2 is already in the passive control mode, and the 08 converter station 2 will continue to maintain the active control mode.
  • the 02 AC line 2 also fails and is tripped by the relay protection device.
  • 13 Island 3 will be decomposed into 11 islands and 12 islands two islands, 08 converter station Second, the island state is detected and received by the inter-station communication. 07 The converter station has entered the passive control mode and continues for a period of time t. 08, the converter station 2 enters the passive control mode and continues to supply power to the 04 user load two.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Protection Of Transformers (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Rectifiers (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

本发明提供一种孤岛状态下抑制多个换流站进入无源控制模式的方法，其通过预先将各换流站分组，分组的原则是正常运行情况下交流测通过交流线路相连的换流站分为一组，每组内部预先设定各换流站的优先级来整定各换流站孤岛检测的相关定值，整定原则为优先级越高的换流站的相关定值越敏感，相应换流站越容易检测到孤岛状态。检测到孤岛状态的换流站只有在本组内优先级高于本换流站的其他所有换流站都发出允许信号时才能进入无源控制模式。

Description

一种孤岛状态下抑制多个换流站进入无源控制模式的方法 技术领域
本发明属于柔性直流输电领域，特别涉及一种孤岛状态下抑制多个换流站进入无源控制模式的方法。
背景技术
随着电力电子技术的不断进步，柔性直流输电技术作为新一代的直流输电技术可解决当前交直流输电技术存在的诸多问题。柔性直流输电系统可以与交流系统一起向用户负荷进行供电，提高供电能力以及供电可靠性。正常情况下，用户负荷由交流输系统和柔性直流输电系统共同承担，柔性直流输电系统处于有源控制模式；当交流线路发生故障而退出运行时，形成孤岛，如果该孤岛内只有一个换流站，那么该换流站处于无源控制模式，能够独立向用户进行供电而不依赖于交流系统，如果该孤岛内含有多个换流站，那么可以选择其中一个换流站进入无源控制模式，建立孤岛的交流电压，而其他换流站仍然处于有源控制模式。如果孤岛内部的交流线路再次发生故障,形成多个孤岛，那么新形成的孤岛中其中一个换流站进入无源控制模式，建立新形成孤岛的交流电压。
因此当形成孤岛时，有必要采取合适的孤岛检测方法快速准确的检测出孤岛状态,并将其中一个柔性直流换流站由有源控制模式切换到无源控制模式，同时要避免其他换流站进入无源控制模式。如果孤岛内部的交流输电线路再次发生故障,形成多个孤岛，那么要保证新形成孤岛中的其中一个柔性直流换流站能够进入无源控制模式，建立新形成孤岛的交流电压并向用户负荷继续供电。
目前公开的文献中没有避免孤岛中的多个柔性直流换流站同时进入无源控制模式的方法。
发明内容
本发明的目的，在于提供一种孤岛状态下抑制多个换流站进入无源控制模式的方法，可以避免同一个孤岛中的多个换流站同时处于无源控制模式，从而避免多个换流站输出电压不同步而导致过流损坏换流阀。
为了达成上述目的，本发明采用的技术方案是：
一种孤岛状态下抑制多个换流站进入无源控制模式的方法，预先将各换流站分组，每组内部预先设定各换流站孤岛检测的优先级来整定各换流站孤岛检测的相关定值。所述将各换流站分组的原则为正常运行情况下交流测通过交流线路相连的换流站分为一组。所述整定各换流站孤岛检测的相关定值的原则为优先级越高的换流站的相关定值越敏感，相应换流站越容易检测到孤岛状态。
检测到孤岛状态的换流站需要本组内优先级高于本换流站的其他所有换流站都发出允许信号时才能进入无源控制模式。所述本组内优先级高于本换流站的其他换流站发出允许信号分为以下情况：
(1)本换流站与本组内优先级高于本换流站的其他换流站无站间通讯；
(2)本换流站与本组内优先级高压本换流站的其他换流站有站间通讯，且本组内优先级高于本换流站的其他换流站不处于无源控制模式；
(3)本换流站与本组内优先级高于本换流站的其他换流站有站间通讯，且本组内优先级高于本换流站的其他换流站进入无源控制模式并延时t时间，其中0<t<10秒。
上述三种情况满足其中的一条或多条，本组内优先级高于本换流站的其他换流站发出允许信号。
采用上述方案后，本发明的有益效果为：
(1)孤岛中含有多个柔性直流换流站时，可以避免多个柔性直流换流站同时进入无源控制模式；
(2)孤岛中的交流输电线路再次发生故障形成多个孤岛时，新形成孤岛中的柔性直流换流站可靠进入无源控制模式。
附图说明
图1是柔性直流输电系统的典型系统拓扑，图中01表示交流线路一，02表示交流线路二，03表示用户负荷一，04表示用户负荷二，05表示交流系统，06表示换流站零，07表示换流站一，08表示换流站二，09表示直流输电线路，10表示柔性直流输电系统，11表示孤岛一，12表示孤岛二，13表示孤岛三；
图2是孤岛状态下抑制多个换流站进入无源控制模式的逻辑示意图，图中ISO_STATE表示本换流站检测到孤岛状态，S1至Sn表示与本换流站同组的优先级高于本换流站的其他换流站，TCOM_NOK_Sx(x＝1...n)表示本换流站与同组的优先级高于本换流站的其他换流站无站间通讯，PAS_MODE_Sx(x＝1...n)表示与本换流站同组的优先级高于本换流站的其他换流站处于无源控制模式，TO_PAS_MODE表示本换流站进入无源控制模式指令。
具体实施方式
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。
本发明提供一种孤岛状态下抑制多个换流站进入无源控制模式的方法，其通过预先将各换流站分组，分组的原则是正常运行情况下交流测通过交流线路相连的换流站分为一组，每组内部预先设定各换流站的优先级来整定各换流站孤岛检测的相关定值，整定原则为优先级越高的换流站的相关定值越敏感，相应换流站越容易检测到孤岛状态。
检测到孤岛状态的换流站需要本组内优先级高于本换流站的其他所有换流站都发出允许信号时才能进入无源控制模式。所述本组内优先级高于本换流站的其他换流站发出允许信号分为以下情况：
(1)本换流站与本组内优先级高于本换流站的其他换流站无站间通讯；
(2)本换流站与本组内优先级高压本换流站的其他换流站有站间通讯，且本组内优先级高于本换流站的其他换流站不处于无源控制模式；
(3)本换流站与本组内优先级高于本换流站的其他换流站有站间通讯，且本组内优先级高于本换流站的其他换流站进入无源控制模式并延时t时间，其中0<t<10秒。
上述三种情况满足其中的一条或多条，本组内优先级高于本换流站的其他换流站发出允许信号，如图2所示。
图1是柔性直流输电系统的典型系统拓扑，正常情况需下，05交流系统与10柔性直流输电系统共同向03用户负荷一和04用户负荷二供电，06换流站零、07换流站一和08换流站二之间通过交流线路相连，分组后三者同组，都处于有源控制模式，其中06换流站零为直流电压控制站，起功率平衡作用，07换流站一和08换流站二为功率控制站，向03用户负荷一和04用户负荷二供电，设置三个换流站优先级由高到低的顺序为06换流站、07换流站一、08换流站二。
各换流站之间无站间通讯条件下，如果01交流线路一发生故障并由继电保护设备将其跳开，那么形成13孤岛三，06换流站零检测不到孤岛状态，由于预先设置的07换流站一的优先级高于08换流站二，那么07换流站一先检测到孤岛状态并进入无源控制模式，将交流电压的大小和频率维持在额定值，此时08换流站二检测不到孤岛状态，继续维持有源控制模式。如果01交流线路一跳开一段时间后，02交流线路二也发生故障并由继电保护设备将其跳开，13孤岛三将分解成11孤岛一和12孤岛二两个孤岛，08换流站二检测到孤岛状态，进入 无源控制模式继续向04用户负荷二供电。
各换流站之间有站间通讯条件下，如果01交流线路一发生故障并由继电保护设备将其跳开，那么形成13孤岛三，06换流站零检测不到孤岛状态继续处于有源控制模式，07换流站一检测到孤岛状态且通过站间通讯收到06换流站零处于有源控制模式，07换流站一立即进入无源控制模式将交流电压的大小和频率维持在额定值，此时08换流站二检测不到孤岛状态且通过站间通讯收到07换流站一已经处于无源控制模式，08换流站二将继续维持有源控制模式。如果01交流线路一跳开一段时间后，02交流线路二也发生故障并由继电保护设备将其跳开，13孤岛三将分解成11孤岛一和12孤岛二两个孤岛，08换流站二检测到孤岛状态且通过站间通讯收到07换流站一已经进入无源控制模式并持续了一段时间t，08换流站二进入无源控制模式继续向04用户负荷二供电。
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。

Claims (4)

  1. 一种孤岛状态下抑制多个换流站进入无源控制模式的方法，其特征在于预先将多端柔性直流输电系统内的换流站进行分组，每组内部预先设定各换流站孤岛检测的优先级，并根据优先级整定各换流站孤岛检测的相关定值；换流站检测到孤岛状态并且只有在本组内部所有优先级高于本换流站的其他换流站都发出允许信号时才能进入无源控制模式。
  2. 如权利要求1所述的一种孤岛状态下抑制多个换流站进入无源控制模式的方法，其特征在于所述将各换流站分组的原则为正常运行情况下交流侧通过交流线路相连的换流站分为一组。
  3. 如权利要求1所述的一种孤岛状态下抑制多个换流站进入无源控制模式的方法，其特征在于所述整定各换流站孤岛检测的相关定值的原则为优先级越高的换流站的相关定值越敏感，相应换流站越快检测到孤岛状态。
  4. 如权利要求1所述的一种孤岛状态下抑制多个换流站进入无源控制模式的方法，其特征在于所述本组内优先级高于本换流站的其他换流站发出允许信号分为以下情况：
    (1)本换流站与本组内优先级高于本换流站的其他换流站无站间通讯；
    (2)本换流站与本组内优先级高压本换流站的其他换流站有站间通讯，且本组内优先级高于本换流站的其他换流站不处于无源控制模式；
    (3)本换流站与本组内优先级高于本换流站的其他换流站有站间通讯，且本组内优先级高于本换流站的其他换流站进入无源控制模式并延时t时间，其中0<t<10秒。
PCT/CN2015/095373 2014-12-11 2015-11-24 一种孤岛状态下抑制多个换流站进入无源控制模式的方法 WO2016091060A1 (zh)

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CA2970119A CA2970119C (en) 2014-12-11 2015-11-24 Method for inhibiting multiple inverter stations from entering passive control mode in island state
DK15868517.2T DK3211741T3 (da) 2014-12-11 2015-11-24 Fremgangsmåde til at forhindre flere vekselretterstationer i en passiv styremodus i en østat
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US15/533,560 US10218184B2 (en) 2014-12-11 2015-11-24 Method for inhibiting multiple inverter stations from entering passive control mode in island state
EP15868517.2A EP3211741B1 (en) 2014-12-11 2015-11-24 Method for inhibiting multiple converter stations into passive control mode in island state
CY20191100647T CY1121769T1 (el) 2014-12-11 2019-06-21 Μεθοδος για την αποτροπη εισοδου πολλαπλων σταθμων μετασχηματιστων σε λειτουργια παθητικου ελεγχου σε κατασταση νησιδας

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