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风电功率的间歇与波动致使电场容量可信度低、可调度性差;同时易引起局部电网的电压不稳、频率波动,影响了系统的电能质量及稳定性。针对此现象,将超级电容器与蓄电池组成快速储能装置,用于风电的潮流优化控制。采用三重双向直流变换电路控制储能元件间的功率流动;采用四象限交直流变换电路控制储能与电网间的能量交换。提出基于超级电容器电压低频波动抑制的功率分配方法,可显著减少蓄电池的充放次数;提出基于储能元件荷电状态的储能能量调整规则,可避免储能元件的过充和频繁深度放电,以优化其功率调节能力。实验结果表明,系统可实现2种储能元件的优势互补,能有效平滑调节风电注入电网的有功功率,并实时补偿控制风电接入点的无功功率。
Intermittent and fluctuating wind power leads to low credibility of electric field capacity and poor schedulability. At the same time, it is easy to cause voltage instability and frequency fluctuation of local power grid, affecting the power quality and stability of the system. In response to this phenomenon, the supercapacitor and battery form a fast energy storage device for the optimal control of wind power flow. A three-way bi-directional DC conversion circuit is used to control the power flow between energy storage components. Four-quadrant AC-DC conversion circuit is used to control the energy exchange between energy storage and power grid. The power distribution method based on the suppression of the low-frequency ripple of the supercapacitor voltage is proposed, which can significantly reduce the charge and discharge times of the battery. The regulation of energy storage based on the state of charge of the energy storage element is proposed to avoid the overcharge and frequent deep discharge of the energy storage element. To optimize its power regulation capability. The experimental results show that the system can realize the complementary advantages of the two kinds of energy storage components, effectively and smoothly adjust the active power injected into the grid by the wind power and compensate and control the reactive power of the wind power access point in real time.