| 引用本文: | 刘晓明,慈文斌,刘玉田.直流控制方式对受端电网电压稳定性影响[J].电力自动化设备,2011,31(4): |
| LIU Xiaoming,CI Wenbin,LIU Yutian.Influence of DC system control mode on voltage stability of receiving-end power grid[J].Electric Power Automation Equipment,2011,31(4): |
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| 摘要: |
| 系统分析了直流系统的基本输电控制方式和极控制方式、低电压下的模式转换控制以及依赖于电压的电流指令限制单元（VDCOL）控制对受端系统电压稳定性的影响。考虑到固定参数的VDCOL难以适应受端系统运行方式的多变性和故障的复杂性，提出了一种基于逆变站交流母线电压水平的动态自适应 VDCOL控制策略。该控制策略中，VDCOL的高电压门槛值随逆变站交流母线电压变化而动态变化，能够在不同情况下合理控制直流电流。仿真表明，新型VDCOL有助于提高受端交流系统电压稳定性。 |
| 关键词: 交直流混合系统 电压稳定 直流控制方式 VDCOL |
| DOI： |
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| 基金项目:国家电网公司重大科技项目（SGKJ［2009］12） |
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| Influence of DC system control mode on voltage stability of receiving-end power grid |
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LIU Xiaoming, CI Wenbin, LIU Yutian
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School of Electrical Engineering，Shandong University，Ji’nan 250061，China
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| Abstract: |
| The influences of DC system’s basic transmission mode，pole control mode，mode shift control and VDCOL（Voltage Dependent Current Order Limiter） on the voltage stability of receiving-end power grid are analyzed. As the VDCOL with fixed parameters could not easily adapt to the operating mode variability and fault complexity of receiving-end power grid，a dynamic adaptive VDCOL control strategy is proposed based on the AC bus voltage level of inverter substation. The high-voltage threshold changes with the variation of AC bus voltage to well control the DC current in different conditions. Simulation shows that the proposed strategy improves the voltage stability of receiving-end power grid. |
| Key words: AC／DC hybrid power system voltage stability DC system control mode VDCOL |
