一种新型VSC潮流计算模型

交替迭代法由于处理换流器控制策略的灵活性以及对单侧潮流计算方法的良好继承性而被广泛采纳,但该方法用于求解基于目前广泛采用的电压源换流器(Voltage Source Converter, VSC)潮流计算模型的混合系统潮流时,会出现交直流系统间的多次交替迭代问题。从避免多次交替迭代问题和进一步减少计算量的角度出发,对VSC潮流计算模型进行重塑,提出一种新型VSC潮流计算模型。该模型将VSC的有功损耗等效至直流侧,并重新对交直流系统设定边界,在避免了交直流系统间多次交替迭代问题的同时也相应减少了混合系统的潮流计算量。最后在IEEE9节点系统增加直流环节形成一个交直流混合系统,对所提模型进行测试,测试结果表明了所提模型的有效性和高效性。

A new VSC power flow calculation model

The alternative iteration method is widely used because of the flexibility of the converter control strategy and the good inheritance of the single-side power flow calculation method. However, there will be multiple alternating iterations between AC and DC systems while the alternative iteration method is used to solve the power flow of the hybrid system based on the existing widely used Voltage Source Converter (VSC) model. To avoid multiple iterative problems and further reduce the computational burden, a new VSC power flow calculation model is reconstructed and proposed. In this model, the active loss of VSC is equivalent to the DC side and the boundary of the AC / DC system is redefined, which can both avoid the multiple alternating iterations problem of the AC / DC system and reduce the power flow computational burden of the hybrid system. Finally, an AC / DC hybrid system is formed by adding DC link in the IEEE9 node system, and is used to test the proposed model. The result validates the effectiveness and efficiency of the proposed model. This work is supported by National Natural Science Foundation of China (No. 51467012).