基于附加电流指令的抑制多馈入直流系统相继换相失败渐进恢复策略

doi:10.12204/j.issn.1000-7229.2021.02.003

电力建设 ›› 2021, Vol. 42 ›› Issue (2): 20-26.doi: 10.12204/j.issn.1000-7229.2021.02.003

• 特高压直流馈入的受端电网规划与运行技术·栏目主持李勇教授 • 上一篇下一篇

基于附加电流指令的抑制多馈入直流系统相继换相失败渐进恢复策略

项颂¹, 万玉良¹, 张超明², 陈璐¹, 吴坚¹, 刘福锁³, 汤奕²

1.国网内蒙古东部电力有限公司,呼和浩特市 010010
2.东南大学电气工程学院,南京市 210096
3.国电南瑞科技股份有限公司,南京市 211106

收稿日期:2020-08-21 出版日期:2021-02-01 发布日期:2021-02-09
通讯作者: 张超明
作者简介:项颂(1985),男,硕士,高级工程师,主要研究方向为电力系统运行分析与控制技术;|万玉良(1972),男,本科,高级工程师,主要研究方向为电力系统运行分析与控制技术;|陈璐(1988),女,硕士,工程师,主要研究方向为大电网稳定分析;|吴坚(1981),男,硕士,高级工程师,主要研究方向为电力系统运行分析与控制技术;|刘福锁(1981),男,硕士,高级工程师,主要研究方向为电力系统安全稳定分析与控制;|汤奕(1977),男,博士,教授,博士生导师,主要研究方向为电力系统稳定与控制、直流输电技术。
基金资助:
国家电网公司科技项目“系统保护构建环境下蒙东电网安全稳定控制适应性及其能力提升关键技术研究”(SGMD0000DDJS1900534)

Incremental Recovery Strategy Based on Additional Current Order to Suppress the Successive Commutation Failure of Multi-infeed DC System

XIANG Song¹, WAN Yuliang¹, ZHANG Chaoming², CHEN Lu¹, WU Jian¹, LIU Fusuo³, TANG Yi²

1. State Grid Inner Mongolia Eastern Power Co., Ltd., Hohhot 010010, China
2. School of Electrical Engineering, Southeast University, Nanjing 210096, China
3. NARI Technology Co., Ltd., Nanjing 211106, China

Received:2020-08-21 Online:2021-02-01 Published:2021-02-09
Contact: ZHANG Chaoming
Supported by:
State Grid Corporation of China Research Program(SGMD0000DDJS1900534)

摘要/Abstract

摘要：

多馈入直流系统结构复杂,各直流系统间相互耦合,一回直流系统换相失败故障可能导致邻近直流系统相继换相失败,造成区域性失电的重大事故。为有效抑制多馈入直流系统相继换相失败,实现各直流系统的有序恢复,提出了一种基于附加电流指令的渐进恢复策略。该策略将各直流换流母线电压有效值与额定值的差额作为系统无功裕度的衡量指标,并计算相应的附加电流指令。考虑到多馈入直流系统各直流系统强度不同,结合多馈入短路比对各直流系统的附加电流指令进行权重分配。最后通过与低压限流环节叠加得到整流侧电流给定值,实现多馈入直流系统的渐进恢复。在PSCAD/EMTDC上搭建测试系统,仿真结果验证了所提策略的有效性。

关键词: 多馈入直流系统, 相继换相失败, 渐进恢复策略, 附加电流指令

Abstract:

The structure of multi-infeed DC (MIDC) system is complex, and there is coupling between DC systems. The commutation failure (CF) of one DC system may leads to the successive CF of the adjacent DC system, resulting in a serious regional power loss. In order to effectively suppress the successive CF of MIDC system and realize the orderly recovery, an incremental recovery strategy based on additional current order is proposed in this paper. In this strategy, the voltage of the converter bus is used as a criterion of reactive power margin, and the corresponding additional current order is calculated according to an appropriate scale factor. Considering the different intensity of the DC systems, the multi-infeed short circuit ratio (MISCR) is utilized to calculate the scale factor. Finally, by the superposition of voltage dependent current order limiter (VDCOL) and the additional current order, the current setting value at rectifier side is obtained to realize the incremental recovery. The test system is built in PSCAD/EMTDC, and the simulation results verify the validation of the proposed strategy.

Key words: multi-infeed DC system, successive commutation failure, incremental recovery strategy, additional current order

中图分类号:

TM773

项颂, 万玉良, 张超明, 陈璐, 吴坚, 刘福锁, 汤奕. 基于附加电流指令的抑制多馈入直流系统相继换相失败渐进恢复策略[J]. 电力建设, 2021, 42(2): 20-26.

XIANG Song, WAN Yuliang, ZHANG Chaoming, CHEN Lu, WU Jian, LIU Fusuo, TANG Yi. Incremental Recovery Strategy Based on Additional Current Order to Suppress the Successive Commutation Failure of Multi-infeed DC System[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(2): 20-26.

图/表 12

图1 三相桥式换流器等效拓扑电路

Fig.1 Equivalent topology of a three-phase bridge converter

图2 换相过程换相电压及对应阀电流关系图

Fig.2 Diagram of commutation voltage and corresponding valve current in commutation

图3 多馈入直流系统拓扑结构示意图

Fig.3 Topology of a multi-infeed DC system

图4 故障及恢复过程整流侧电流指令示意图

Fig.4 Diagram of the rectifier current order during fault and recovery process

图5 整流侧电流给定值相关控制环节结构示意图

Fig.5 Diagram of the relevant control links of the rectifier current order

图6 测试系统拓扑结构

Fig.6 Topology of the test systems

表1 测试系统联络阻抗及系统阻抗

Table 1 Contact impedance and system impedance of the test systems Ω

图7 考虑系统无功裕度对故障恢复过程的影响

Fig.7 Influence of system reactive power margin on fault recovery process

图8 各直流系统整流侧电流给定值对比

Fig.8 Comparison of rectifier current commands of DC systems

图9 考虑多馈入系统直流强度对整流侧电流给定值的影响

Fig.9 Influence of DC intensity on current command of rectifier side

图10 考虑多馈入系统直流强度对功率传输恢复的影响

Fig.10 Influence of DC intensity on power transmission

表2 改进策略前后多馈入系统功率传输情况对比

Table 2 Comparison of power transmission in multi-infeed system before and after the improvement

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基于附加电流指令的抑制多馈入直流系统相继换相失败渐进恢复策略

Incremental Recovery Strategy Based on Additional Current Order to Suppress the Successive Commutation Failure of Multi-infeed DC System

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