Dynamic Load Power Sharing Method With Elimination of Bus Voltage Deviation for Energy Storage Systems in DC Micro-grids
Dynamic Load Power Sharing Method With Elimination of Bus Voltage Deviation for Energy Storage Systems in DC Micro-grids
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发表时间：
2013
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通讯作者：
Josep M. Guerrero
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作者：
Josep M. Guerrero
为了充分利用直流微网中分散的储能单元，提出了一种改进的基于荷电状态（SOC）的储能系统下垂控制方法，实现了不同储能单元间的动态负载功率分配。传统下垂控制方法中的系数与SOC的n阶成反比，SOC的变化速度和输出功率的均衡都可以调节由于上述方法是在下垂控制的基础上实现的，因此涉及到直流母线电压的偏差。为了使母线电压恢复到其参考值，本文采用了二次控制方法。对于具有恒定下垂系数的下垂控制方法，采用了常规的二次控制。在上述改进的下垂控制方法中，下垂系数随SOC的变化而变化，它作为一种扰动作用于二次控制，对基于SOC的下垂控制方法进行了二次控制的可行性验证，得到了整个控制系统的模型，并在此基础上对系统的稳定性进行了研究，利用Matlab/基于dSPACE 1103开发了一台2×2.2 kW样机，并进行了仿真验证。
In order to take advantage of the dispersed energy storage units in the DC micro-grids,an improved state of charge(SOC) based droop control method for energy storage systems was proposed in this paper.Dynamic load power sharing among different energy storage units was achieved by using this method.Specifically,the coefficient in the conventional droop control method was set to be inversely proportional to the nth order of SOC.The speed of SOC and output power equalization can be adjusted by changing the exponent n of SOC.Since the above method was realized based on droop control,the deviation in the DC bus voltage was involved.Secondary control method was employed in this paper in order to restore the bus voltage to its reference value.The conventional secondary control was used for the droop control method with constant droop coefficient.In the above improved droop control method,the droop coefficient was changed by the SOC.It acted upon secondary control as a disturbance.In this paper,the feasibility of secondary control for the SOC-based droop control method was tested.The model of the overall control system was obtained and the system stability was thereby studied based on it.Simulation validation was realized by Matlab/Simulink and a 2×2.2 kW prototype based on dSPACE1103 was implemented for the experimental demonstration.