AVC Comprehensive Coordinated Control Strategy of Centralized Condenser in Northwest Power Grid

doi:10.12096/j.2096-4528.pgt.22157

Abstract

Abstract:

This paper presented a comprehensive coordinated control strategy of centralized condenser in high-voltage DC converter station which participated in automatic voltage control (AVC) to perform the reactive power optimization in high proportion new energy areas of Northwest Power Grid. Firstly, the general control idea of AVC was analyzed, and the three-level voltage control mode based on “soft partition” was given. According to the actual situation of Northwest power grid and Qinghai power grid, the coordinated control variables between them were established. Combined with the optimal power flow model, the comprehensive coordinated control strategy of Qaidam condenser participating in AVC was formed. The good applicability of the control strategy was demonstrated by the example of power grid large disturbance encountered during the AVC joint commissioning test of Qaidam condenser. The presented strategy enhances the condenser’s reactive power source effect in the case of steady-state operation. Meanwhile, it ensures instantaneous strong reactive power support capability in the case of power grid fault. As a result, the strategy gives full play to the performance of the condenser, and improves the level of reactive power and voltage regulation of power grid.

Key words: electric system, condenser, automatic voltage control (AVC), reactive power replacement, high proportion new energy

CLC Number:

TM 73

Yang XIAO, Zhiqiang LI, Lin CHENG, Lei TANG, Chao XIA, Ying LIANG, Rui SONG, Dongyang WANG, Hewen LI. AVC Comprehensive Coordinated Control Strategy of Centralized Condenser in Northwest Power Grid[J]. Power Generation Technology, 2023, 44(2): 270-279.

Figures/Tables 9

References 24

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设备	功能	时间作用域
电网AVC主站	以整体电网的安全经济运行为目标，协调网内各级控制中心、直调电厂/变电站以及调相机等无功资源，产生控制策略，对于调相机系统，表征为调相机所属站高压侧母线电压的设定区间以及调相机无功/电压设定值	1~5 min级，以电网安全为约束，以电网经济为约束，针对交直流电网，考虑交直流故障以及调相机等动态无功资源
调相机AVC子站	调整调相机无功出力值，确保换流站高压侧交流母线电压正常同时调相机无功追踪其设定值(设定值来源于电网AVC主站或者人工设定)	百毫秒级~秒级，相当于传统电厂的AVC子站，使得电网定电压特性由机端节点延伸到高压侧母线
调相机励磁系统	调整调相机无功输出，确保调相机机端电压输出追踪其设定值(设定值来源于调相机AVC子站、DCS或者人工设定)	几十毫秒~百毫秒级，相当于传统机组的励磁系统，使得机端节点表征为PV节点(定电压运行)
调相机装置本体	电网电压变化后，调相机装置由于物理结构及电磁耦合所表现出来的无功电压快速自主响应，外部系统无法干预	几十毫秒级，当电网故障发生瞬间发挥作用，提供无功快速支撑

设备	功能	时间作用域
电网AVC主站	以整体电网的安全经济运行为目标，协调网内各级控制中心、直调电厂/变电站以及调相机等无功资源，产生控制策略，对于调相机系统，表征为调相机所属站高压侧母线电压的设定区间以及调相机无功/电压设定值	1~5 min级，以电网安全为约束，以电网经济为约束，针对交直流电网，考虑交直流故障以及调相机等动态无功资源
调相机AVC子站	调整调相机无功出力值，确保换流站高压侧交流母线电压正常同时调相机无功追踪其设定值(设定值来源于电网AVC主站或者人工设定)	百毫秒级~秒级，相当于传统电厂的AVC子站，使得电网定电压特性由机端节点延伸到高压侧母线
调相机励磁系统	调整调相机无功输出，确保调相机机端电压输出追踪其设定值(设定值来源于调相机AVC子站、DCS或者人工设定)	几十毫秒~百毫秒级，相当于传统机组的励磁系统，使得机端节点表征为PV节点(定电压运行)
调相机装置本体	电网电压变化后，调相机装置由于物理结构及电磁耦合所表现出来的无功电压快速自主响应，外部系统无法干预	几十毫秒级，当电网故障发生瞬间发挥作用，提供无功快速支撑

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