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正弦电流波形的单位功率因数运行，没有额外的功能来改善线路电压和电流质量。太阳能光伏发电系统逆变器的实际输出功率通常小于视在额定功率，这意味着太阳能光伏发电系统也可以扩展到改善公用电力线的电压和电流质量，我们提出并研究了太阳能光伏发电系统，以改善公用电力线的质量，如下图所示；并联电流控制系统：该系统由逆变器电流控制回路与终端电压控制回路组成，结构简单。然后控制终端电压并进行谐波补偿，将太阳能光伏发电产生的实电从逆变器送至公用线路。源电流控制系统：该系统也是由源电流控制回路与端电压控制回路构成。附加反馈回路不仅可以很好地防止系统振荡，而且可以抑制终端电压畸变，将实际功率送到公用线路。3 .部分遮阳补偿系统：采用双电层电容补偿控制电路，可避免太阳能电池板部分遮阳造成的显著功率下降。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的串级双向斩波电路，用EDLCS作为充放电控制电路来补偿功率波动。作为短时间间隔的质量控制，从研究中可以看出，终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充电控制电路的可行性，EDLCS有助于减轻光伏功率波动。

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.