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工作在单位功率因数和正弦电流波形，并且没有额外的功能来改善线电压和电流质量。太阳能PV系统逆变器的真实的功率输出通常小于视在功率额定值，这意味着太阳能PV系统也可以扩展以改善公用电力线电压和电流质量，我们提出并研究了太阳能PV发电系统以改善公用电力线质量，如下所示; 1.互连电流控制系统：该系统易于由逆变器电流控制环和端电压控制环构成。然后，该系统可以控制端电压和补偿其谐波，并将太阳能光伏发电的真实的功率从逆变器发送到公用事业线。2.电源电流控制系统：该系统也是由电源电流控制环和端电压控制环构成。附加的反馈回路工作良好，不仅防止了系统振荡，而且抑制了向公用线路发送真实的功率的端电压失真。3.部分阴影补偿系统：采用双电层电容补偿控制电路，可以避免太阳能电池板局部遮光引起的功率下降.4.太阳能光伏波动功率补偿控制系统：提出并研究了一种新型的级联双向斩波电路，用于充放电控制电路，以补偿功率波动，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都是非常有用的。此外，我们确认了所提出的具有EDLCS的充电控制电路的可行性，其有助于减轻PV功率波动。

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.