多分层直流馈入的特高压环网开断运行特性及安控措施

doi:10.11930/j.issn.1004-9649.201909024

中国电力 ›› 2020, Vol. 53 ›› Issue (10): 206-214.DOI: 10.11930/j.issn.1004-9649.201909024

多分层直流馈入的特高压环网开断运行特性及安控措施

白帅涛¹, 陈得治², 马世英², 董清¹, 汤伟³, 吉平², 杨铖³, 蒋希凯⁴

1. 华北电力大学电气与电子工程学院，河北保定 071003;
2. 中国电力科学研究院有限公司，北京 100192;
3. 国网安徽省电力有限公司，安徽合肥 230061;
4. 国网沈阳供电公司，辽宁沈阳 110021

收稿日期:2019-09-04 修回日期:2020-03-17 发布日期:2020-10-05
作者简介:白帅涛(1993—)，男，硕士研究生，从事电力系统分析、安全和控制研究，E-mail：bst199302@163.com;陈得治(1974—)，男，通信作者，博士，高级工程师(教授级)，从事电力系统分析与控制研究，E-mail：chendz@epri.sgcc.com.cn

Operation Characteristics and Security Control Measures of UHV Loop Network with Multi-Hierarchical DC Infeed after Breaking

BAI Shuaitao¹, CHEN Dezhi², MA Shiying², DONG Qing¹, TANG Wei³, JI Ping², YANG Cheng³, JIANG Xikai⁴

1. Electrical and Electronic Engineering College of North China Electric Power University, Baoding 071003, China;
2. China Electric Power Research Institute, Beijing 100192, China;
3. State Grid Anhui Electric Power Co., Ltd., Hefei 230061, China;
4. State Grid Shenyang Electric Power Supply Company, Shenyang 110021, China

Received:2019-09-04 Revised:2020-03-17 Published:2020-10-05

摘要/Abstract

摘要： 某受端省级电网的特高压交流环网投运后，为多特高压直流分层接入、满功率消纳提供了条件，受端特高压交直流以及1000 kV/500 kV交流电网之间的耦合强度加大。为保证故障后特高压交直流电网的可靠运行，仿真分析了1000 kV特高压环网开断后交直流耦合的电压稳定特性，以及开断后大功率转移至500 kV电网的热稳定特性，分析了此电网结构下电压稳定、热稳定两大运行问题产生的原因；为减小防控措施量，计及直流调制、切负荷等多资源控制手段的灵敏度以及优先级，建立了防控两大运行问题的统一多资源协控优化模型，并提出了基于控制代价的恒步长梯度下降启发式寻优方法来求解得到协控措施。依托实际电网开展了仿真计算，验证了该控制措施能够有效减少防控措施量。

关键词: 特高压交流, 环网结构, 特高压直流, 热稳定, 电压稳定, 耦合特性, 协调控制

Abstract: The operation of a provincial UHV AC loop network provides conditions for hierarchical access and full power accommodation of multiple UHV DC systems, and also increases the coupling strength between UHV AC and UHV DC, and between 1000 kV/500 kV AC power grids at the receiving end. To ensure the reliable operation of UHV AC/DC power grids after line fault occurs, simulation is used to analyze the voltage stability characteristics of the coupled AC and DC systems after breaking of the 1000 kV UHV loop network, and the thermal stability characteristics of the power system when large power transfers to the 500 kV power grid after breaking, and the causes for voltage stability and thermo-stability problems are studied. In order to reduce the amount of security control measures, a unified multi-resource co-control optimization model is established for controlling the two operational problems, with consideration of the sensitivity and priority of multiple control methods such as DC modulation and load shedding. And a control-cost-based heuristic optimization method of constant-step gradient descent is proposed to obtain the co-control measures. It is verified through simulation of an actual power grid that the proposed controlling method can effectively reduce the amount of prevention and control measures.

Key words: UHVAC, loop network structure, UHVDC, thermal stability, voltage stability, coupling characteristics, coordinated control

白帅涛, 陈得治, 马世英, 董清, 汤伟, 吉平, 杨铖, 蒋希凯. 多分层直流馈入的特高压环网开断运行特性及安控措施[J]. 中国电力, 2020, 53(10): 206-214.

BAI Shuaitao, CHEN Dezhi, MA Shiying, DONG Qing, TANG Wei, JI Ping, YANG Cheng, JIANG Xikai. Operation Characteristics and Security Control Measures of UHV Loop Network with Multi-Hierarchical DC Infeed after Breaking[J]. Electric Power, 2020, 53(10): 206-214.

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https://www.electricpower.com.cn/CN/Y2020/V53/I10/206

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多分层直流馈入的特高压环网开断运行特性及安控措施

Operation Characteristics and Security Control Measures of UHV Loop Network with Multi-Hierarchical DC Infeed after Breaking

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多分层直流馈入的特高压环网开断运行特性及安控措施

Operation Characteristics and Security Control Measures of UHV Loop Network with Multi-Hierarchical DC Infeed after Breaking

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