基于轨道交通供电系统双向变流装置分散补偿无功的技术与应用研究

Research on Distributed Reactive Power Compensation Technology and Application of Bidirectional Converter in Rail Transit Power Supply System

在城市轨道交通建设中,一般采用在新建主变电所内设置无功补偿装置等方式进行无功补偿,受安装场地、环控通风及供电线路无功特点等影响,补偿装置前期安装容量不宜过大。本文结合大功率可控双向变流装置的系统特征和应用情况,对双向变流装置分散补偿无功的原理及控制策略进行了论述及研究。依据实际工程案例对轨道交通供电系统无功情况进行分析,同时对采用双向变流装置分散补偿无功的可行性以及其系统接入、容量选择等方面进行分析,现场测试数据表明双向变流装置能够分散补偿地铁供电系统中压网络产生的容性无功,可供同类线路设计参考。

In the construction of urban rail transit,such modes as setting reactive power compensation devices in the new main substation is generally adopted for reactive power compensation.The installation capacity of the compensation device at early stage shall not be too large due to such influence as installation site,environmental control ventilation and reactive power characteristics of power supply lines.In this paper,the principle and control strategy of decentralized reactive power compensation in bidirectional converter based on the system characteristics and application of high power controllable bidirectional converter are described and studied in combination with the system characteristics and application of high power bidirectional converter.The reactive power situation of rail transit power supply system is analyzed in combination with practical engineering cases and,at the same time,such aspects as feasibility and its system access as well as capacity selection of using bidirectional converter to disperse reactive power compensation are analyzed.The field test data shows that the bidirectional converter can compensate capacitive reactive power generated in the medium voltage network of subway power supply system and can be used as reference for the design of similar line.