市场机制下多微电网多时间尺度优化调度研究

Multi-time scale optimal scheduling strategy of multi-microgrid based on market mechanism

针对区域配电网中多个微电网不同时间尺度中与电网或相互间复杂的功率交互问题,提出了一种多微电网包含日前、日内多个时间尺度的优化调度方法。在日前调度中(30 min),综合配电系统功率波动性和经济性建立包含多微网在内的配电系统调度模型,得到各微电网对外的交换功率参考值,通过市场机制引导多微网系统中各微网制定日前微网层调度计划,并基于熵权法建立多个微电网的利益分配机制。在日内调度中(15 min),通过配置混合储能系统来消除日前计划的误差,针对不同类型储能充放电特性的差异,采用小波包对混合储能的充放电功率进行频域分解,同时考虑到功率型储能频繁充放电下充放电功率不平衡性,对其荷电状态(state of charge,SOC)进行模糊反馈调节。对算例计算分析表明:多个微电网通过多个时间尺度的自治消纳控制和协调互济可优化配网系统的运行,同时对决策变量储能进行充放电功率自适应控制可有效提高微网间的互济能力。

Aiming at the problem of complex power interaction between multiple microgrids or with the grid in a regional power distribution network at different time scales,a multi-microgrid optimization scheduling method including multiple time scales was proposed.In the day-ahead dispatching(30 min),a power distribution system scheduling model with multi-microgrids was established by considering the power fluctuation and economy of the distribution system,and the reference values of external power exchange for each microgrid were obtained.Through the market mechanism,each microgrid in the system was guided to formulate day-ahead micro network scheduling plan,and the profit distribution mechanism of multiple microgrids was established based on entropy weight method.In the intraday scheduling(15 min),a hybrid energy storage system was configured to eliminate the error of the day-ahead scheduling.According to the difference of the charging and discharging characteristics of different types of energy storage,wavelet packet was used to decompose the charging and discharging power of hybrid energy storage in frequency domain.To store the power-type energy,considering the imbalance of charging and discharging power under the frequent charging and discharging,the SOC was adjusted by fuzzy feedback.The calculation analysis of the example shows that multiple micro-grids can optimize the operation of the distribution system through autonomous consumptive control and coordinate mutual control on multiple time scales.At the same time,the adaptive control of charge and discharge power for the energy storage can effectively improve mutual ability between each microgrids.