In this paper, a novel control strategy is proposed for a hybrid energy storage system (HESS), as a part of the grid‐independent hybrid renewable energy system (HRES), to maintain active power balance among different constituents of HRES. The considered HRES includes a wind energy conversion system (WECS), a photovoltaic (PV) system, the HESS comprising the battery energy storage system (BESS) and supercapacitor energy storage system (SCESS), dump load, and a set of critical and noncritical loads. The proposed control strategy is executed into two parts: In the first part, the HESS controller maintains the active power balance among different constituents of HRES under variable operating conditions (viz, wind speed, solar irradiance, and load). The low‐frequency components of imbalance power are diverted to BESS for its smooth charging/discharging while the high‐frequency components are diverted to the SCESS, thereby reducing the stress on BESS. Further, the state of charge of the HESS is maintained within the limits and hence increasing its operating life. In the second part, the three‐phase inverter controller, based on vector control technique, regulates the three‐phase AC voltage magnitude and frequency within limits against any perturbation. The novelty of the proposed control strategy lies also in the fact that some portion of the power, which remains uncompensated by BESS when using conventional low pass filter (LPF) scheme, is compensated by SCESS by generating reference current corresponding to this uncompensated power. Further, the synergetic use of the typical HRES—PV system and WECS—and the typical HESS—BESS and SCESS—is also a new proposition. Simulations are carried out in MATLAB/Simulink and the results demonstrate the effectiveness of the control strategy in terms of active power balance of HRES, regulation of DC link voltage (V_DC), three‐phase AC voltage and frequency, and maintaining SoC constraints of HESS in transient as well as steady state conditions.

中文翻译：

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独立于电网的混合可再生能源系统中混合储能系统的新型控制策略

本文提出了一种新的混合动力储能系统（HESS）控制策略，作为独立于电网的混合可再生能源系统（HRES）的一部分，以保持HRES不同组成部分之间的有功功率平衡。所考虑的HRES包括风能转换系统（WECS），光伏（PV）系统，由电池储能系统（BESS）和超级电容器储能系统（SCESS）组成的HESS，卸载负荷以及一组关键和非关键的负载。所提出的控制策略分为两个部分：在第一部分中，HESS控制器在可变的运行条件（即风速，太阳辐射和负载）下保持HRES不同组成部分之间的有功功率平衡。不平衡功率的低频分量被转移到BESS，以实现平滑的充电/放电，而高频分量被转移到SCESS，从而减轻了BESS的压力。此外，HESS的充电状态保持在极限内，因此增加了其使用寿命。在第二部分中，基于矢量控制技术的三相逆变器控制器可在限制范围内调节三相交流电压的大小和频率，以防止任何干扰。所提出的控制策略的新颖性还在于这样的事实，即，当使用常规的低通滤波器（LPF）方案时，功率的某些部分仍未被BESS补偿，而SCESS通过产生与该未补偿功率相对应的参考电流来对其进行补偿。进一步，典型的HRES-PV系统和WECS以及典型的HESS-BESS和SCESS的协同使用也是一个新的主张。在MATLAB / Simulink中进行了仿真，结果证明了该控制策略在HRES的有功功率平衡，直流链路电压（V _DC），三相AC电压和频率，并在瞬态和稳态条件下保持HESS的SoC约束。