基于多电平逆变器的并网太阳能光伏系统潮流控制

A. Mittal, K. Janardhan, A. Ojha
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引用次数: 6

摘要

本文在MATLAB SIMULINK平台上对3.25 $\ mathm {kW}_{\ mathm {P}}$多电平逆变器并网单级太阳能光伏发电系统进行了仿真。完全避免了DC-DC变换器,电压稳定、最大功率点跟踪和直流到交流转换仅通过多电平逆变器完成。开发了具有五个开关的五电平多电平逆变器,并且为了进一步提高输出电压波形的每两个电平,只需要增加一个额外的开关。$1-\Phi$多电平逆变器输出与来自电网的$1-\Phi$, 230V, 50 Hz电源集成。并联有源电流控制器的设计是为了保证系统中只有真实的潮流存在。得到的输出电压总谐波畸变只有1.18%,直到$100^{\ mathm {t}\ mathm {h}}$谐波含量非常少,采用多载波正弦脉宽调制控制方案控制逆变器。仿真结果与并网常规逆变器的实际日发电量进行了验证。所提方法与实际数据吻合较好,并取得了较好的电能质量。
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Multilevel inverter based Grid Connected Solar Photovoltaic System with Power Flow Control
In this paper a 3.25 $\mathrm{kW}_{\mathrm{P}}$ grid connected single stage solar photovoltaic system with multilevel inverter and real time weather conditions is simulated on the MATLAB SIMULINK platform. DC-DC converter is completely avoided, voltage stabilization, maximum power point tracking and DC to AC conversion are done through only multilevel inverter. Five level multilevel inverter with five switches is developed and further to increase each two levels in the output voltage waveform only one more additional switch is to be added. The $1-\Phi$ multilevel inverter output is integrated with the $1-\Phi$, 230V, 50 Hz supply from the grid. Shunt active current controller is designed to ensure that only real power flow exist in the system. The output voltage total harmonic distortion obtained is only 1.18% till $100^{\mathrm{t}\mathrm{h}}$ harmonic content, which is very less and multi carrier sinusoidal pulse width modulation control scheme is used to control inverter. The simulation results are validated with the practical per day energy generated through grid connected conventional inverter. Proposed work closely fits with practical data and better power quality is achieved.
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