针对风电功率波动对电网造成的不利影响及混合储能系统容量配置问题,提出一种基于双通道自适应滑动平均法的混合储能系统优化策略。首先,使用滑动平均法对不平衡功率进行预处理,通过改变滑动平均法滑动步长来改变并网参考功率的波动;其次,使用经验模态分解方法对混合储能系统参考功率进行分解与重构,针对重构后的高频功率通道和低频功率通道分别使用自适应滑动平均法,旨在消除功率重构时高低频段功率的能量混叠现象,使储能元件能够根据自身频率特性精确响应;最后,使用双目标粒子群优化算法建立以混合储能系统成本和并网功率波动为目标函数的优化模型,通过设置目标权重建立单一评价标准。算例验证结果表明,在单一评价标准最优时与常规方法对比波动率下降0.06%
同时成本降低了29.51%。算例结果验证了该方法的可靠性和优越性。
According to the adverse effects of wind power fluctuation on the power grid and the capacity allocation of hybrid energy storage system(HESS)
it proposes a optimizing strategy of HESS based on the dual-channel adaptive moving-average model.Firstly
the unbalance power is pretreated by moving-average method
and the fluctuation of grid-connected reference power is changed by changing the sliding step size of moving average method.Secondly
the reference power of HESS is decomposed and reconstructed by the approach of empirical mode decomposition(EMD)
which eliminates the overlaps of high frequency and low frequency powers in the process of energy reconstruction.The process made the energy storage unit an accurate response according to its own frequency characteristics.Finally
a bi-objective particle swarm optimization is used to establish an optimization model with the cost and grid-connected power fluctuations as the objective functions
and a single evaluation criterion is established by setting the objective weights.A numerical example shows that the volatility decreases by 0.06% and the cost decreases by 29.51% compared with the conventional method under the single evaluation criterion.The results of numerical examples verify the reliability and superiority of the proposed method.
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