高压直流换流变压器有载分接开关控制优化

doi:10.12204/j.issn.1000-7229.2021.02.002

摘要/Abstract

摘要：

换流变压器有载分接开关是高压直流输电系统实现电压、功率调节功能的重要设备。针对近年来换流变压器有载分接开关在档位调节过程中相继发生爆炸起火等严重故障,有必要研究避免有载分接开关不必要动作的措施,降低分接开关故障风险。梳理并分析了不同类型直流换流站的有载分接开关控制策略,揭示了部分在运换流站档位频繁调节的原因;在此基础上,从运行方式、控制参数及控制策略三方面开展研究,提出三类降低动作次数的措施,并基于实时数字仿真平台搭建仿真模型,对各类措施在降低有载分接开关动作次数方面的效果进行了仿真比较。最后,通过工程调试及运行情况进一步验证了这些措施的可行性,并对各类措施的优缺点及适用条件进行了讨论。

关键词: 高压直流输电系统, 有载分接开关, 频繁调节, 控制策略, 实时数字仿真(RTDS)

Abstract:

The on-load tap changer is important equipment to realize voltage and power regulation in HVDC system. In recent years, several serious faults arose during on-load tap changer adjustment process. To reduce the risk of tap changer failure, it is necessary to study the measures to avoid unnecessary adjustment of the tap changer. The control strategies of on-load tap changer of different types of HVDC converter stations are analyzed in this paper, and the reasons for the unnecessary continual adjustment of tap changer in some stations are revealed. On that basis, research on the optimizing of the operation mode, control parameters and control strategy is carried out, and three kinds of measures to reduce the adjustment times of the on-load tap changers are presented. Simulation models are set up to compare the effect of these measures. Finally, the feasibility of these measures is further verified by both simulation and site operation experience, the relative merits and application conditions for the suggested measures are also discussed.

Key words: HVDC system, on-load tap changer, continual adjustment, control strategy, real time digital simulation (RTDS)

中图分类号:

TM403.3

郭贤珊, 李凤祁, 阮思烨, 张俊, 刘心旸. 高压直流换流变压器有载分接开关控制优化[J]. 电力建设, 2021, 42(2): 9-11.

GUO Xianshan, LI Fengqi, RUAN Siye, ZHANG Jun, LIU Xinyang. Optimization on Control Strategy of Tap Changer in HVDC Converter Transformer[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(2): 9-11.

图/表 15

图1 整流站有载分接开关控制逻辑原理图

Fig.1 Control logic of tap changer in rectifier station

图2 整流站有载分接开关控制逻辑流程图

Fig.2 Flow chart of tap changer control in rectifier station

图3 背靠背直流逆变站有载分接开关控制逻辑原理图

Fig.3 Control logic of tap changer in back-to-back DC inverter station

图4 背靠背直流逆变站有载分接开关控制逻辑流程图

Fig.4 Flow chart of tap changer control in back-to-back DC inverter station

图5 端对端直流逆变站有载分接开关控制逻辑原理图

Fig.5 Control logic of tap changer in end-to-end DC inverter station

图6 端对端直流逆变站有载分接开关控制逻辑流程图

Fig.6 Flow chart of tap changer control in end-to-end DC inverter station

图7 常规全压运行方式下有载分接开关动作情况仿真

Fig.7 Simulation case of tap changer operation in traditional full-voltage operation mode

图8 降压运行方式下有载分接开关动作情况仿真

Fig.8 Simulation case of tap changer operation in reduced-voltage operation mode

图9 有载分接开关往复调节过程原理示意图

Fig.9 Schematic diagram of tap changer to-and-fro continual adjustment

图10 优化电压死区/异步调节后有载分接开关动作情况仿真

Fig.10 Simulation case of tap changer operation in optimizing DC voltage dead-band and asynchronous adjusting mode

表1 天中直流系统主回路计算参数(原策略)

Tab.1 Main circuit operation parameters of Tianzhong UHVDC project (original strategy)

表2 天中直流主回路计算参数(新策略)

Table 2 Main circuit operation parameters of Tianzhong UHVDC project(novel strategy)

图11 直流动态电压控制策略与原策略对比

Fig.11 Comparison of original strategy and DC dynamic voltage control strategy

图12 直流动态电压控制策略下有载分接开关动作情况仿真

Fig.12 Simulation case of tap changer operation in DC dynamic voltage control strategy mode

表3 昭沂直流输电工程直流动态电压控制现场试验测试数据

Table 3 Field test data of DC dynamic voltage control strategy in Zhaoyi HVDC project

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