含电压源型换流器直流电网的交直流网络潮流交替迭代方法

发布时间：2019-01-05 19:40

【摘要】：随着电压源型换流器(VSC)及基于VSC的并联型直流电网的不断发展,未来电网会形成含VSC的多直流母线、多直流联络线和多直流负荷的交直流网络。文中分析了VSC的稳态模型及其控制方式,详细推导了含VSC直流电网的交直流网络稳态潮流模型,研究了不同控制方式直流电网的潮流求解方法。在此基础上提出了一种通用交直流网络潮流交替迭代方法,该算法根据VSC换流站的不同控制方式在交流侧和直流侧解耦等效,先进行直流电网潮流迭代,后进行交流电网潮流迭代,二者交替计算直至直流电网、换流站和交流电网全部收敛。算法适用于不同的直流电网控制方式且考虑了直流变量约束条件和运行方式的合理调整。最后在改进的IEEE 57节点交直流电网上,验证了所提出的交替迭代方法的有效性和准确性。
[Abstract]:With the continuous development of voltage source converter (VSC) and parallel DC network based on VSC, the future power network will form multi-DC bus, multi-DC tie-line and multi-DC load AC / DC network. This paper analyzes the steady-state model of VSC and its control mode, deduces the steady-state power flow model of AC / DC network with VSC DC network in detail, and studies the power flow solution method of DC network with different control methods. On this basis, a general alternating power flow iteration method for AC / DC networks is proposed. According to the different control modes of the VSC converter station, the algorithm is equivalent to decoupling at the AC side and the DC side, and the power flow iteration of the DC power network is carried out first. After the AC power flow iteration, the two alternately calculate until the DC network, converter station and AC grid convergence. The algorithm is suitable for different DC network control modes and takes into account the constraints of DC variables and the reasonable adjustment of operation mode. Finally, the effectiveness and accuracy of the proposed alternative iteration method are verified on the improved IEEE 57 bus AC / DC network.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);许继集团有限公司;
【分类号】：TM721.1

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