独立运行微电网平抑有功差额波动研究

Research on Active Power Difference Balancing of Autonomous Operation Microgrid

独立运行的微电网中,由于负荷峰谷差特性以及分布式电源的存在,一天中的有功功率差额存在较大的波动性,不利于后备电源的稳定经济运行。通过配置合理的储能装置,采取有效的充放电策略,后备电源在出力平稳的前提下,微电网频率能保持在规定范围之内。以此为目标,建立了独立运行微电网有功功率差额波动最小的数学模型,充分考虑储能装置的荷电状态(SOC)、充放电效率及循环控制等因素。采用动态规划算法求解,并通过仿真算例分析,验证了所建模型的有效性以及动态规划算法的适用性。

In autonomous operation microgrid, due to the peak and valley load difference characteristics and the existence of distributed power, the active power difference has great fluctuation, which is not conducive to the stability and economy of reserve power operation. Through using reasonable allocation of energy storage device and effective charge-discharge strategy, the frequency of microgrid can keep in a reasonable range under the premise of the smooth output of reserve power. Take this as target, a mathematics model of active power difference minimum fluctuation in autonomous operation microgrid is established in the paper. And the state of charge （SOC）, the charge-discharge efficiency and the cycle control of the energy device are also considered in the model. The problem was solved through dynamic programming algorithm. At last, the effectiveness of the proposed model and the applicability of the dynamic programming algorithm are verified through example simulation analysis.