直流输电系统控制参数对交直流连接母线电压幅值的影响

采用灵敏度分析方法对交直流输电系统稳态运行条件下的相互影响作了详细分析。分析了直流输电系统控制参数变化对直流输电系统输送的有功功率和需要的无功功率的影响,进而导致交直流连接节点电压的变化情况。采用解耦求解与联合求解2种方法讨论了不同控制方式下,直流输电系统控制参数对交直流连接母线电压幅值的影响。结合交直流输电系统的计算结果,总结了直流输电系统电压设定值、电流设定值、触发角(或熄弧角)设定值、功率设定值以及换流变压器变比对换流器有功功率和无功功率的影响,以及这些控制量对交直流连接母线电压幅值的影响。其影响的大小和方向取决于系统采用的控制方式以及系统网络参数。运用所提出的方法易从计算得到的灵敏度矩阵中分析交直流输电系统之间稳态运行条件下的相互影响。

Influence of DC control parameters on joint buses of AC/DC hybrid power systems

Based on the sensitivity analysis method,interactions between AC and HVDC(High Voltage DC transmission) systems in steady-state operation condition are investigated.Using both de-coupling method and united method,the influence of control parameter adjustment on active power transmission and reactive power consumption in HVDC system,which causes further the voltage change at the jointing nodes,is analyzed under different control modes.With the numeric simulations,influences are summarized for the settings of direct voltage,direct current,ignition angle(or extinction angle),active power and converter transformer ratio.The degree and direction of these influences depends on the control mode and the network parameters of AC/DC systems.Interactions between AC and HVDC systems in steady-state condition can be easily analyzed with proposed sensitivity analysis method.