WO2014131373A1 - 多端柔性直流输电系统停运站并入运行系统的方法 - Google Patents

多端柔性直流输电系统停运站并入运行系统的方法 Download PDF

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WO2014131373A1
WO2014131373A1 PCT/CN2014/075653 CN2014075653W WO2014131373A1 WO 2014131373 A1 WO2014131373 A1 WO 2014131373A1 CN 2014075653 W CN2014075653 W CN 2014075653W WO 2014131373 A1 WO2014131373 A1 WO 2014131373A1
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station
outage
direct current
operating system
operating
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French (fr)
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WO2014131373A8 (zh
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董云龙
李钢
田杰
汪楠楠
刘超
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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 high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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
    • 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
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
    • H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • 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 field of power electronics technology, and particularly relates to a multi-terminal flexible direct current transmission system outage station integrated into operation The method of the line system.
  • Multi-end soft HVDC transmission has more advantages in terms of operational flexibility and reliability than flexible DC transmission at both ends, while constructing multi-end flexibility HVDC transmission can meet grid interconnection, urban grid power supply, multiple wind farms (new energy) interconnection, etc. significance.
  • the flexible DC transmission at the opposite ends of the multi-terminal flexible DC transmission system is more complicated and requires higher operation.
  • How to Maintaining safe and reliable operation of multi-terminal flexible DC transmission systems is the focus of attention in the industry, especially for multi-terminal flexible DC
  • the transmission and shutdown station access operation system At present, the stop station access operation system will be shipped first. The line system is out of service and the entire multi-terminal flexible DC transmission system is restarted. This method has the following disadvantages:
  • the object of the present invention is to provide a method for incorporating a shutdown station of a multi-terminal flexible direct current transmission system into an operating system, Through simple sequential operation and control, it can avoid all the multi-terminal flexible DC transmission system being out of service.
  • the defect of the stop station incorporating the multi-end system method can also be stopped in the running system, and the original outage station is incorporated into the operating system. In this case, effectively suppress the AC and DC overcurrent generated when the outage station is integrated into the operating system, making the outage station safe and reliable.
  • the ground is connected to the network.
  • the solution of the present invention is:
  • the multi-terminal flexible direct current transmission system package The three-terminal and three-terminal converter stations connected by a DC line, wherein the DC side of each converter station includes a pole connection
  • the AC side includes an AC line switch, a converter transformer and a charging resistor connected in series with each other, and two of the charging resistors
  • the terminal is also connected in parallel with a bypass switch, and the operating system refers to a sound operation of the multi-terminal flexible direct current transmission system except the shutdown station.
  • System the method comprises the following steps:
  • the stop station selects the STATCOM operating mode
  • the stop station selects the fixed DC voltage control mode to unlock
  • the outage station is converted from the STATCOM operation mode to the DC operation mode;
  • the outage station is incorporated into the operating system.
  • the precharge completion flag is that the DC voltage of the shutdown station is the valve side AC line.
  • the voltage rms value is 1.15 to 1.7 times and remains stable.
  • the allowable range of the difference is an absolute value of 5 kV or less.
  • the AC side of the above-mentioned outage station is an active system.
  • the above operating system includes two or more converter stations.
  • the above-mentioned outage station is a converter station or a plurality of converter stations in the multi-terminal flexible direct current transmission system.
  • Figure 1 is a schematic diagram of a multi-terminal flexible DC transmission system including a shutdown and operation system (with three-terminal flexible DC transmission) The system is an example);
  • Figure 2 is a flow chart showing the operation of the present invention.
  • the multi-terminal flexible direct current transmission system targeted by the present invention includes three-terminal and three-terminal exchanges connected by a direct current line a flow station, wherein the DC side of each converter station comprises a pole connection device, and the AC side comprises an AC line connected in series with each other a switching transformer and a charging resistor, and a bypass switch is further connected in parallel at both ends of the charging resistor, the operating system Refers to a sound operating system in a multi-terminal flexible direct current transmission system other than the outage station, including two or more commutation station.
  • the three-terminal flexible DC transmission system is operated, and the operation station 1 and the operation station 2 are operated in DC mode at both ends.
  • the outage station is out of operation.
  • the operating system is not allowed to exit, Reduce the impact of AC current and DC current on the operating system, and the multi-terminal flexible DC transmission system shutdown station is integrated into the operation system.
  • QS1 for the DC side isolation knife switch of the converter of the stop station, and the DCS isolation knife gate QS3 for the converter of the stop station, QS1 and QS3 are in no particular order;
  • the stop station selects the STATCOM operation mode, and the STATCOM operation mode refers to the parallel static reactive compensation method.
  • the active power control mode is selected as the fixed DC voltage control
  • the reactive power control mode is selected as the fixed reactive power control.
  • the stop station selects the fixed DC voltage control mode to unlock
  • the outage station is switched from the STATCOM operation mode to the DC operation mode, and the shutdown station is incorporated into the operation system.
  • the multiple outage stations can be merged in the same way as described above, regardless of whether Successive.
  • the present invention introduces an implementation scheme with a three-terminal flexible direct current transmission system, but the present invention is not limited to a three-terminal system, and is three-terminal
  • the above multi-terminal flexible DC transmission system is applicable. Anything involved in judging the voltage difference between the outage station and the operating system Within the allowable range, the DC station is switched from the DC voltage control mode to the active power control after the DC breaker is switched. Methods are all within the scope of the invention.

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

Abstract

本发明公开一种多端柔性直流输电系统停运站并入运行系统的方法，包括如下内容：停运站选择STATCOM运行方式；交流侧旁路开关断开，充电电阻接入交流线路；合交流进线开关，通过充电电阻对停运站换流阀进行预充电；预充电完成后，合旁路开关；停运站选择定直流电压控制方式解锁；控制停运站直流电压值与运行系统直接电压值的差值在允许范围内；合停运站换流器直流侧极连接设备；停运站由STATCOM运行方式切换到直流运行方式，停运站并入运行系统。此方法能够保持运行站持续运行，有效抑制停运站并网产生的直流过电流和交流过电流，使停运站安全可靠的并网。

Description

多端柔性直流输电系统停运站并入运行系统的方法 技术领域
本发明属于电力电子技术领域，特别涉及一种多端柔性直流输电系统停运站并入运 行系统的方法。
背景技术
随着电力电子器件和控制技术的进步，柔性直流容量和电压等级越来越高。多端柔 性直流输电在运行灵活性、可靠性上比两端柔性直流输电更有优势，同时构建多端柔性 直流输电能够满足电网互联、城市电网供电、多个风电场（新能源）互联等，具有重要 意义。但多端柔性直流输电系统相对两端柔性直流输电更加复杂，运行要求更高，如何 保持多端柔性直流输电系统安全可靠运行是业内关注的焦点，特别是针对多端柔性直流 输电停运站接入运行系统目前还未有较好的解决方法。目前停运站接入运行系统先将运 行系统停运，然后将整个多端柔性直流输电系统重新起动。此种方法有如下缺点：
（1）增加了多端柔性直流输电系统的停运概率；
（2）运行系统如果连接重要负荷停运将造成重大损失；
（3）运行系统如果连接风电场等新能源导致新能源的退出并重新投入，减少了能源 利用率。
为了提高多端柔性直流输电稳定性和可靠性，充分发挥多端柔性直流输电优势，需 要一种更加有效的停运站并入运行系统控制方法，本案由此产生。
发明内容
本发明的目的，在于提供一种多端柔性直流输电系统停运站并入运行系统的方法， 其通过简单的顺序操作和控制，可以避免将多端柔性直流输电系统全部停运，才能将原 停运站并入多端系统方法的缺陷，也可以在运行系统不停运，原停运站并入运行系统的 情况下，有效抑制停运站并入运行系统时产生的交流和直流过电流，使停运站安全可靠 地并网。
为了达成上述目的，本发明的解决方案是：
多端柔性直流输电系统停运站并入运行系统的方法，所述多端柔性直流输电系统包 括借助直流线路连接的三端及三端以上换流站，其中每个换流站的直流侧包括极连接设 备，交流侧包括相互串联的交流进线开关、换流变压器和充电电阻，所述充电电阻的两 端还并联旁路开关，所述运行系统指多端柔性直流输电系统中除停运站以外的健全运行 系统；所述方法包括如下步骤：
（1）包括以下两部分内容，两部分内容的操作顺序不分先后：
（a）停运站选择STATCOM运行方式；
（b）停运站交流侧旁路开关断开，充电电阻接入交流线路；合交流进线开关，通过 充电电阻对停运站换流阀进行预充电；预充电完成后，合旁路开关；
（2）停运站选择定直流电压控制方式解锁；
（3）控制停运站直流电压值与运行系统直接电压值的差值在允许范围内；
（4）合停运站换流器直流侧极连接设备；
（5）停运站由STATCOM运行方式转换为直流运行方式；
（6）停运站并入运行系统。
上述步骤（1）的内容（b）中，预充电完成的标志为停运站直流电压为阀侧交流线 电压有效值的1.15～1.7倍，且维持稳定。
上述步骤（3）中，差值的允许范围为绝对值小于等于5kV。
上述停运站交流侧为有源系统。
上述运行系统包括两个或两个以上换流站。
上述停运站是多端柔性直流输电系统中的一个换流站或多个换流站。
包含多个停运站时，多个停运站依次并入，不分先后。
采用上述方案后，本发明的有益效果为：
（1）本发明提供的多端柔性直流输电系统停运站并入运行系统的方法，避免了健全 的运行站强迫停运；
（2）本发明提供的多端柔性直流输电系统停运站并入运行系统的方法，可以有效抑 制停运站并入运行系统产生的交流和直流过电流；
（3）本发明提供的多端柔性直流输电系统停运站并入运行系统的方法，适合多端柔 性直流输电系统的工程应用，操作简单，控制有效。
附图说明
图1是包括停运和运行系统的多端柔性直流输电系统示意图（以三端柔性直流输电 系统为例说明）；
图2是本发明的操作流程图。
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。
本发明所针对的多端柔性直流输电系统包括借助直流线路连接的三端及三端以上换 流站，其中，每个换流站的直流侧包括极连接设备，交流侧包括相互串联的交流进线开 关、换流变压器和充电电阻，所述充电电阻的两端还并联有旁路开关，所述的运行系统 是指多端柔性直流输电系统中除停运站以外的健全运行系统，包含两个或两个以上换流 站。
如图1所示为三端柔性直流输电系统，运行站1与运行站2以两端直流方式运行， 停运站处于退出运行状态。为了实现停运站并入运行系统不造成运行系统退出运行，同 时减小对运行系统交流电流和直流电流冲击，多端柔性直流输电系统停运站并入运行系 统采用如图2所示步骤：
（1）合停运站换流器直流侧隔离刀闸QS1，合停运站换流器直流侧隔离刀闸QS3， 合QS1与QS3不分先后顺序；
（2）停运站选择STATCOM运行方式，所述STATCOM运行方式指并联静止无功补偿方 式，有功功率控制方式选择为定直流电压控制，无功功率控制方式选择为定无功功率控 制/定交流电压控制；
（3）交流侧旁路开关Q2断开，充电电阻接入交流线路；合交流进线开关Q1，停运 站交流侧为有源系统，通过充电电阻对停运站换流阀进行预充电；预充电电压达到交流 线电压有效值的1.15-1.7倍，且维持稳定，表示预充电完成，合充电电阻的旁路开关Q2；
此处需要说明的是，前述步骤（1）-（3）的操作顺序不分先后。
（4）停运站选择定直流电压控制方式解锁；
（5）控制停运站直流电压值与运行系统直接电压值的差值ΔU在允许范围内， ΔU≤5kV。
（6）合停运站换流器直流侧断路器Q3；
（7）停运站由STATCOM运行方式切换到直流运行方式，停运站并入运行系统。
当多个停运站均需并入运行系统时，可将该多个停运站按前述方法依次并入，不分 先后。
本发明以三端柔性直流输电系统介绍实施方案，但本发明不限于三端系统，对三端 以上的多端柔性直流输电系统都适用。任何牵涉到通过判断停运站与运行系统电压差在 允许范围内，合直流断路器开关后将停运站由直流电压控制方式切换到有功功率控制的 方法都属于本发明范围之内。
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 (8)

  1. 多端柔性直流输电系统停运站并入运行系统的方法，所述多端柔性直流输电系统 包括借助直流线路连接的三端及三端以上换流站，其中每个换流站的直流侧包括极连接 设备，交流侧包括相互串联的交流进线开关、换流变压器和充电电阻，所述充电电阻的 两端还并联旁路开关，所述运行系统指多端柔性直流输电系统中除停运站以外的健全运 行系统；其特征在于所述方法包括如下步骤：
    （1）包括以下两部分内容，两部分内容的操作顺序不分先后：
    （a）停运站选择STATCOM运行方式；
    （b）停运站交流侧旁路开关断开，充电电阻接入交流线路；合交流进线开关，通过 充电电阻对停运站换流阀进行预充电；预充电完成后，合旁路开关；
    （2）停运站选择定直流电压控制方式解锁；
    （3）控制停运站直流电压值与运行系统直接电压值的差值在允许范围内；
    （4）合停运站换流器直流侧极连接设备；
    （5）停运站由STATCOM运行方式转换为直流运行方式；
    （6）停运站并入运行系统。
  2. 如权利要求1所述的多端柔性直流输电系统停运站并入运行系统的方法，其特征 在于：直流侧极连接设备可以是隔刀和断路器的任意组合。
  3. 如权利要求1所述的多端柔性直流输电系统停运站并入运行系统的方法，其特征 在于：所述步骤（1）的内容（b）中，预充电完成的标志为停运站直流电压为阀侧交流 线电压有效值的1.15～1.7倍，且维持稳定。
  4. 如权利要求1所述的多端柔性直流输电系统停运站并入运行系统的方法，其特征 在于：所述步骤（3）中，差值的允许范围为绝对值小于等于5kV。
  5. 如权利要求1所述的多端柔性直流输电系统停运站并入运行系统的方法，其特征 在于：所述停运站交流侧为有源系统。
  6. 如权利要求1所述的多端柔性直流输电系统停运站并入运行系统的方法，其特征 在于：所述运行系统包括两个或两个以上换流站。
  7. 如权利要求1所述的多端柔性直流输电系统停运站并入运行系统的方法，其特征 在于：所述停运站是多端柔性直流输电系统中的一个换流站或多个换流站。
  8. 如权利要求1所述的多端柔性直流输电系统停运站并入运行系统的方法，其特征 在于：包含多个停运站时，多个停运站依次并入，不分先后。
PCT/CN2014/075653 2013-02-26 2014-04-18 多端柔性直流输电系统停运站并入运行系统的方法 Ceased WO2014131373A1 (zh)

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