基于二阶锥规划的有源配电网SNOP电压无功时序控制方法

Sequential Voltage Regulation of Soft Normally Open Point in Active Distribution Network Based on Second-order Cone Programming

智能软开关(soft normally open point,SNOP)是一种代替传统联络开关可进行实时功率控制的电力电子装置,在正常运行时主要提供有功功率的传输,当电压问题突出时,SNOP可进行电压无功控制。为此,首先建立了SNOP电压无功控制问题的时序模型,该模型数学上属于大规模非线性规划问题,给计算求解带来较大的挑战;通过采用凸松弛技术将其转化为二阶锥模型,实现该问题的快速、准确求解;最后,采用IEEE 33节点算例,对所提出的优化模型与求解方法进行了分析与验证。结果表明,利用SNOP在有源配电网中进行电压无功控制,可以有效地缓解电压波动、降低系统损耗;基于二阶锥规划的求解方法在保证求解最优性的同时,极大地提高了计算效率。

Soft normally open point （SNOP） refers to a novel power electronic device with the capability ot real-time power adjustment, which is usually to replace a tie switch and responsible for active power transfer in normal conditions and for voltage regulation if needed. Firstly, sequential voltage regulation model of SNOP is established, and it is essentially a large scale nonlinear optimization problem, bringing a challenge for solving the problem. Secondly, a method is proposed to change the model into a solvable form by second-order cone programming （SOCP）, solving the problems quickly. Finally, case studies on IEEE 3 3-node system verify the effectiveness of the proposed model and the method. The utilization of SNOP for voltage regulation in active distribution network can effectively reduce the voltage fluctuations and decrease the network loss. The solving method based on SOCP can ensure solving optimality and greatly improve computational efficiency.