面向低压配变台区的微电网技术

Microgrid technology for low voltage distribution transformer station area

大规模分布式电源、储能和电动汽车等电力电子装置分散接入配电网,致使出现用户侧供电电压频繁双向越限、台区潮流倒送、谐波超标等问题,给配电网供电电能质量、运行经济性和供电可靠性造成了重大影响;本文结合配电网台区实际建设情况,提出了一种面向低压配变台区的新型微电网配置方法,并系统阐述了面向低压配变台区的微电网技术架构、功能架构和控制目标,建立了基于台区微电网两阶段协调控制模型,通过微电网协调控制与优化调度,实现分布式电源优化并网和高效发电。采用典型台区微电网进行了仿真计算,验证了方法和模型的有效性。

Large-scale distributed power supply, energy storage and electric vehicles are distributed into the distribution network, resulting in frequent bidirectional overrun of power supply voltage at the user side, power flow reversal at the station area, harmonic overrun and other issues, which have a significant impact on the power quality, operation economy and reliability of distribution network. A new micro-grid configuration method for low-voltage distribution transformer area is presented. The technical framework, functional framework and control objectives of the micro-grid oriented to lowvoltage distribution transformer area are systematically described. A two-stage coordinated control model based on the micro-grid is established. Through the coordinated control and optimal dispatch of the micro-grid, the optimal grid-connected and efficient generation of distributed generation are realized. The validity of the method and model is validated by the simulation calculation of typical microgrid.