Photovoltaic Power Generation System with Improvement of Quality of Utility Interconnected Line

传统的太阳能光伏系统逆变器通常以单位功率因数运行，电流波形为正弦波，没有额外的功能来改善线路电压和电流质量。太阳能光伏系统逆变器的实际功率输出通常小于视在功率额定值，这意味着太阳能光伏系统还可以扩展以改善市电线路电压和电流质量，我们提出并研究了太阳能光伏发电系统以改善市电线路质量，如下所示；.1.互连电流控制系统：该系统很容易由逆变器电流控制环路与终端电压控制环路构建。然后，系统除了将太阳能光伏发电产生的有功功率从逆变器发送到公用线路外，还可以控制端电压并补偿其谐波。2.源电流控制系统：该系统也由源电流控制环路和端电压控制环路构成。附加的反馈环路运行良好，不仅可以防止系统振荡，而且可以抑制向公用线路发送有功功率的端电压失真。3.部分阴影补偿系统：通过使用双电层电容器（EDLC）补偿控制电路可以避免太阳能电池板部分阴影造成的功率显着降低。4.太阳能光伏波动功率补偿控制系统：我们提出并研究了一种新型级联双向斩波电路，带有EDLCS充电和放电控制电路来补偿功率作为短时间间隔质量控制，从研究中可以看出，端电压谐波分量的反馈增益控制对于控制方法1和2都非常有用。此外，我们证实了所提出的EDLCS充电控制电路对于减轻PV功率波动的可行性。

The conventional solar PV system inverter normally operates at unity power factor with sinusoidal current waveform and has not additional functions to improve the line voltage and current qualities. The solar PV system inverters real power output is typically less than the apparent power rating, meaning that solar PV systems can be also extends to improve the utility power line voltage and current qualities, we proposed and investigated the solar PV generation system to improve the utility power line qualities as shown next ;.1.Interconnecting current control system : The system is easily constructed by the inverter current control loop with terminal voltage control loops. Then the system can control the terminal voltage and compensate its harmonies in addition to send the solar PV generated real power to the utility line from the inverter.2.Source current control system : The system is also constructed by the source current control loop with terminal voltage control loops. The additional feed back loop operates well not only for preventing the system oscillation but also suppressing the terminal voltage distortion sending real power to the utility line.3.Partial shading compensation system : The significant power reduction caused by partial shading of solar cell panel can be avoided by using the compensation control circuit with Electric Double Layer Capacitors (EDLCs).4.Solar PV fluctuation power compensation control system : We proposed and investigated a novel cascade bidirectional chopper circuit with EDLCS for charge and discharge control circuit to compensate the power fluctuationAs short time interval quality control, it can be seen from the investigations that the feedback gain control of the terminal voltage harmonics component is very useful for the both control methods 1 and 2.Moreover, we confirmed the feasibility of the proposed charge control circuit with EDLCS useful to mitigating the PV power fluctuation.