PV water pumping with a peak-power tracker using a simple six-step square-wave inverter

被引:61
作者
Muljadi, E
机构
[1] National Renewable Energy Laboratory, Golden
关键词
peak-power tracker; photovoltaic; PV array; renewable energy; village electrification; water pumping;
D O I
10.1109/28.585862
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The application of photovoltaics (PV's) has been increasingly popular, especially in remote areas, where power from a utility is not available or is too costly to install, PV-powered water pumping Is frequently used for agriculture and in households. Among many available schemes, the system under study consists of a PV array, a variable-frequency inverter, an induction motor, and a water pump. The inverter feeds the induction motor, which drives the water pump. To seek the optimum power output of the PV array, the inverter is operated at variable frequency, to vary the output of the water pump. The inverter is operated to generate a six-step quasi-square wave, instead of a pulsewidth modulated (PWM) voltage output, to reduce the switching losses. The inverter acts as both a variable-frequency source and a peak-power tracker of the system, thus, having the number of switches minimized. The system is a low-cost design, with a simple control strategy. The de bus is supported by a de capacitor; thus, a balance-of-power how must be maintained to avoid the collapse of the de-bus voltage. Another advantage of the system is that the current is limited to an upper limit of the PV-array current. Thus, in case a short circuit is developed, the motor winding and the power semiconductor switches can be protected against excessive current pow.
引用
收藏
页码:714 / 721
页数:8
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