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发明公开
CN104362672A 一种风力发电系统 无效 - 驳回

一种风力发电系统
摘要：
本发明涉及一种风力发电系统。该系统采用储能型泄放电路，该电路中由两个带有反并联二极管的开关元件、电感、电阻组成。当检测到直流母线电压高于设定的最高电压值时，储能型泄放电路中的第二开关元件断开，第一开关元件与第二二极管构成降压斩波电路，通过电感将多余的能量吸收，直流电压降低；当直流母线电压降低到允许的最低电压值时，第一开关元件断开，第二开关元件与第一二极管构成升压斩波电路，释放储存在电感中的能量，帮助直流母线电压恢复正常值。通过对储能型泄放电路的两个开关器件的交替斩波控制，可以实现高电压穿越过程中直流母线能量的泄放和稳压控制，并且可以通过释放电感中的能量帮助直流母线电压在降低后快速恢复。
摘要（英）：

The invention relates to a wind power generation system comprising an energy-storage leakage circuit. The energy-storage leakage circuit is composed of two switching elements each provided with antiparallel diodes, an inductor and a resistor. When the fact that voltage of a direct current bus is greater than set highest voltage is detected, the second switching element in the energy-storage leakage circuit is switched off, the first switching element and a second diode form a buck chopper circuit, and direct-current voltage is lowered after the inductor absorbs surplus energy; when the voltage of the direct current bus drops to allowable lowest voltage, the first switching element is switched off, the second switching element and a first diode form a boost chopper circuit, and energy stored in the inductor is released to assist in restoring a normal value of the voltage of the direct current bus. The switching elements of the energy-storage leakage circuit are subjected to alternate chopper control, energy leakage and voltage stability control of the direct current bus during high voltage ride-through can be achieved, and the voltage of the direct current bus can be assisted in restoring fast after dropping, by releasing the energy from the inductor.

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