基于广义下垂控制的电力电子变压器运行策略优化组合

针对多台电力电子变压器构成的交直流混合系统中,电力电子变压器端口运行模式复杂,组合多样的问题,提出了一种基于广义交直流下垂控制的电力电子变压器运行策略优化组合方法,在保证系统安全运行的同时保证可再生能源的充分消纳。广义交直流下垂控制可通过控制系数的调整来近似端口运行模式的切换,避免了在非线性规划模型中引入整数变量,有效降低了模型的复杂度。在此基础上,建立了考虑可再生能源不确定性的电力电子变压器运行策略鲁棒组合优化模型,并进一步采用双层优化方法对所提模型进行求解,算例仿真结果证明了该方法的有效性与可行性。

Optimal Combination of Operation Strategy for Power Electronic Transformer Based on Generalized Droop Control

For the complexity of operation mode of the power electronic transformer (PET) ports and their multiple combinations in hybrid AC/DC grid composed of several PETs, an optimal combination method of operation strategy for PETs based on generalized AC/DC droop control (GADDC) is proposed, the objective of which is to fully utilize the renewable energy while maintaining the stability operation of power system. The switching between different control modes of PET ports could be approximated by adjusting the coefficients of GADDC, which avoids importing integer variables in the non-linear programming model, thus effectively reducing the complexity of the proposed model. Based on this, a robust combined optimization model of PET operation strategy considering the uncertainty of renewable energy is established. Furthermore, a bi-level optimization method is adopted to solve the proposed model. Simulation results verify the effectiveness and feasibility of the proposed method.