使用直流电容的PV逆变器的虚拟惯性

2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe) Pub Date : 2016-09-01 DOI:10.1109/EPE.2016.7695607

E. Waffenschmidt, R. Hui

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引用次数: 45

摘要

很快，光伏逆变器必须覆盖电网控制的虚拟惯性。建议使用直流链路电容。这需要5w, 50j，每安装kW的电容器尺寸约为200 cm3，对应于单相直流链路电容器的尺寸。结果表明，额外的功率纹波(以及电流纹波)约为0.1%，中间电压的电压纹波通常保持在+/-3.6%之间。通过在控制电压上添加与频率偏差成正比的电压信号，可以很容易地扩展相关控制。然后，现有控制器固有地设定了虚拟惯性函数所需的额外功率波动。

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Virtual inertia with PV inverters using DC-link capacitors

Soon, virtual inertia for grid control must be covered by photovoltaic inverters. It is suggested to use DC link capacitors for this task. This requires 5 W, 50 J and a capacitor size of about 200 cm3 per installed kW, corresponding to the size of single phase DC link capacitors. It is shown that the additional power ripple (and thus current ripple) is in the order of 0.1% and the voltage ripple of the intermediate voltage will typically remain between +/-3.6%. The related control can be easily extended by adding a voltage signal to the control voltage, which is proportional to the frequency deviation. Then, the existing controller inherently sets the required additional power fluctuation required for the virtual inertia function.

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2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)

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