一种通用控制结构的孤岛微电网能量管理方案

ENERGY MANAGEMENT SCHEME OF ISLANDED MICROGRID WITH COMMON CONTROL STRUCTURE

针对可再生能源(renewable energy sources,RES)和储能系统(energy storage system,ESS)组成的混合微电网,由于不同微源间特性、容量等存在差异,造成控制方案多样,不利于系统扩展和能量管理。通过系统频率建立逆变器与交流微网间有功功率交换关系,通过直流母线电压建立逆变器与前级可再生能源或者储能单元间的能量平衡,提出一种通用形式的控制结构。逆变器作为联通前级微源与后级交流微网的媒介,采用电压控制模式,能够实现能量的双向流动和直流母线电压稳定控制。根据提出的微源控制策略,基于微网频率信号,该文又提出一种孤岛微电网能量管理方案。该方案依赖本地信息进行能量管理,不需要通信,系统可靠性高。仿真和实验验证该策略的可行性。

For the hybrid microgrid with renewable energy sources （RES） and energy storage system （ESS） , the expansibility and energy management are limited due to diverse control strategies resulting from the different characteristics and capacities of microsources. The active power exchange relation between the inverter and AC microgrid was established trough the system frequency, and the energy balance between the inverter and the pre-class renewable energy or the energy storage unit was established by the DC bus voltage, and a general control structure was proposed. As the medium connecting pre-class microsources and the post-AC microgrid, using voltage control mode, the inverter could realize the two-way flow of energy and stable control of the DC bus voltage. Based on the proposed control strategy of microsources and microgrid frequency signal, an energy management strategy of the island microgrid was proposed, only relying on local information and could avoid using communication line and the reliability of the system was high. The feasibility of the proposed strategy was verified by simulation and experimental results.