基于虚拟电网磁链的直驱式风力发电系统直接功率控制
首发时间:2011-08-11
摘要:为了提高直驱式风力发电系统网侧逆变器的可靠性和抗电网电压波动,同时进一步降低并网逆变器的成本,在此提出了一种无电网电压传感器的网侧PWM变换器的直接功率控制策略。采用虚拟电网磁链来计算角度,无需检测电压信号,网侧直接功率控制采用电压空间矢量调试(SVPWM)方式实现定频控制。仿真结果表明:该方案实现了并网逆变器单位功率因数控制,抗干扰能力强,电网输入电流畸变较小,具有更优的瞬时功率静动态控制特性,并实现了直流母线电压稳定。
关键词: 直驱式风力发电 无电网电压传感器 虚拟电网磁链 定频直接功率控制
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Direct Power Control of Direct-drive Wind Power System based on Virtual Grid Flux
Abstract: In order to improve the reliability and the anti-grid voltage fluctuations of the network side of the grid-connected inverter about direct-drive wind power system ,while further reducing the cost of grid-connected inverter, a strategy of direct power control of the network of the PWM converter without grid voltage sensor is presented. It uses a virtual grid flux to calculate angle without detection voltage signal and the direct power control of the net side uses voltage space vector debug (SVPWM) method to achieve fixed-frequency control. Experimental results show that the scheme achieved the grid-connected inverter unit power factor control,strong anti-interference ability, low power input current distortion and has better static and dynamic control characteristics of instantaneous power, and the DC bus voltage stability, which verifies the feasibility and correctness of the scheme.
Keywords: direct-drive wind power without grid voltage sensor avirtual grid flux direct power control with fixed frequency
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