针对传统单级DC/DC变换器高降压变换困难的以及发电间歇问题及电网惯性不足的问题,本文提出了一种具有虚拟连轴电机特性的高降压比直流固态变压器(DC Electronic Power Transformer,DCEPT)控制方法。控制策略可在维持直流配网稳定的同时实现对上级高压电网的自主响应与功率支持。为直流并网接口提供惯性支持,有效实现对上级电网的惯性和阻尼支撑。拓扑具有降压比较高、负载响应速度快、具有较好的抗干扰能力。仿真结果验证了所提拓扑方法以及虚拟联轴控制策略的有效性。
英文摘要:
In view of the traditional single stage DC / DC converter high step-down transform difficult problems and lack of intermittent power generation and grid inertia, a with virtual coupling DC motor characteristics of high step-down solid state transformer control method is proposed in this paper. The control strategy can be realized in the maintenance of the DC power distribution network and the independent response and power support of the higher voltage power grid. The topology has a high buck, fast load response, and has a good ability to resist interference. The simulation results verify the proposed topology and the effectiveness of the virtual axis control strategy.