基于通用电能路由器的微电网架构及其控制方法

在中压直流作为电源的交直流混合微电网中,低压公共交直流母线为多变流器的接入提供了稳定电压。微电网通过配置电能路由器,构建低压交直流母线电压,在保障交直流系统故障隔离的前提下,可实现交直流系统功率的双向传输,提升了新能源的消纳,同时还可提高混合微电网的运行可靠性。文中提出基于通用电能路由器单元的低压微电网系统拓扑,设计了电能路由器的端口配置及控制模式,优化了电源与电网的接入,通过多机并联控制策略,有效解决了多电源并联运行稳定性问题,研究了变换器的电压一次调节、二次调节及微电网控制模式快速转换的控制方法,可有效丰富配电网的运行方式,优化光伏、风电等新能源的消纳路径。

A micro-grid architecture based on universal energy router unit and its control method

Supplied by medium-voltage-DC power source, the AC-DC hybrid microgrid derives a stable AC-DC system voltage which ensures the parallel-operation stability of the multiple converters. The distribution network is configured with energy router to build low-voltage AC-DC system voltage and provide power to the AC-DC loads. Under the premise of ensuring fault isolation of the AC and DC systems, energy router can achieve two-way power transmission of AC and DC power supply, which enhance the consumption of multi-source and improves the reliability of microgrids. This paper proposes a system topology of the low voltage AC-DC hybrid microgrid based on the universal energy router technology, and optimizes the port configuration and control mode of the energy router. The multi-source parallel control strategy is studied, which effectively improves the stability of multi-source parallel operation. Also the control strategies including primary regulation, secondary regulation and fast conversion of converter control modes, can effectively enrich the operation modes of the distribution network, optimize the consumption path of new energy sources such as photovoltaics and wind power, and improve the efficiency and reliability of the overall system operation.#$NLKeywords: universal energy router; microgrid topo; multi-source parallel; conversion of converter control modes