模块化多电平换流阀新型运行试验拓扑及其控制方法

New operation test topology and control method of modular multilevel converter valve

为了考核模块化多电平换流阀应力及其运行可靠性,针对高压大容量柔性直流换流阀子模块电压逐步提高的情况,提出了一种模块化多电平换流阀新型运行试验拓扑及其控制方法。首先对柔性直流换流阀的典型运行工况进行了应力分析;其次,结合应力分析,提出一种模块化多电平换流阀新型运行试验拓扑,并建立了该试验拓扑的数学模型,阐述了其运行机理;同时,通过控制量的对称性,实时消去了交直流控制量中的直流分量;最后,搭建了仿真模型并进行了验证。结果表明,提出的模块化多电平换流阀新型运行试验拓扑及其控制方法具有正确性和有效性,所提试验拓扑降低了直流试验电源的电压需求,其控制方法简化了试验电路的控制。

In order to check the stress and operation reliability of modular multilevel converter valve,a new operation test topology and control method of modular multilevel converter valve is proposed under the condition of gradually increasing sub module voltage of high voltage and large capacity flexible DC converter valve.Firstly,the stress analysis of typical operation condition of the flexible DC converter valve is carried out.Secondly,combined with stress analysis,a new operation test topology of modular multilevel converter valve is proposed,and the mathematical model of the test topology is established,and its operation mechanism is expounded.At the same time,combined with the symmetry of the control parameters,the DC component in the control variables is eliminated in real time.Finally,the simulation model is built and verified.The results show that the new operation test topology and control method of modular multilevel converter valve are correct and effective.The proposed test topology reduces the voltage demand of DC test power supply,and its control method simplifies the control of test circuit.