计及需求响应的并网型微电网协同优化策略

Coordinated Optimization Strategy for Grid-connected Microgrid Considering Demand Response

为提高微电网的经济效益,提出了计及需求响应的并网型微电网协同优化策略。首先建立微电网中可调控负荷和各发电单元模型。然后,构建了微电网双层协同优化模型,上层在满足用户舒适度的基础上,利用分时电价信息引导用户侧可调控负荷参与需求响应,并将优化后的负荷曲线输出到下层模型;下层在满足供需平衡和发电单元约束的基础上,优化分布式能源出力、储能充放电功率和并网功率,以降低微电网的日运行成本。最后,模型采用差异进化算法进行求解,通过算例仿真比较不同情况下微电网的优化结果,验证了该策略的有效性。

To improve the economic benefit of microgrid, a coordinated optimization strategy for grid-connected mi- crogrid is put forward considering demand response （DR）. First, a model of controllable load （CL） and a model of gen- eration units of mierogrid are established. Then, a bi-level coordinated optimization model for microgrid is established. On the upper level, the CL on the user side can be guided by the time-of-use （TOU） electricity price to participate in the DR on the basis of satisfying the user＇s comfort degree, and the optimized load curve is output to the lower model ; on the lower level, the output power of distributed sources, discharging/charging power of battery energy storage system （BESS） , and grid-connected power are optimized on the basis of meeting the supply-demand balance and the con- straints of generation units to reduce the daily operation cost of microgrid. Finally, differential evolution （DE） algorithm is employed to solve the bi-level coordinated optimization model, and simulation results of an example in different modes verify the validity of the proposed strategy.