This article investigates a hybrid control scheme to grant multiple functions to a grid-connected PV inverter. This strategy guarantees constant energy supply independently of the intermittent nature of solar energy. Further, it contributes to the mitigation of power-quality issues such as harmonic cancellation and power-factor correction. The control scheme comprises a current control loop based on passivity theory, which improves the inverter power quality, while the operation under null or intermittent generation conditions is ensured by the proportional-integral-based voltage control loop. Therefore, the proposed strategy extends the inverter operation in conditions in which there is no power generation. These additional functions decrease the total harmonic distortion and improve the power factor of the active power demanded from and supplied to the grid. Simulation tests and experimental results are presented to verify the suggested control approach and validate the operation and effectiveness of the system with the control scheme.

中文翻译：

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光伏并网逆变器消谐、功率因数校正及夜间运行的混合控制技术

本文研究了一种混合控制方案，可为并网光伏逆变器提供多种功能。这种策略保证了独立于太阳能的间歇性的持续能量供应。此外，它还有助于缓解谐波消除和功率因数校正等电能质量问题。该控制方案包括一个基于无源理论的电流控制回路，提高了逆变器的电能质量，同时基于比例积分的电压控制回路保证了零或间歇发电条件下的运行。因此，所提出的策略在没有发电的条件下扩展了逆变器操作。这些附加功能降低了总谐波失真并提高了从电网需求和提供给电网的有功功率的功率因数。仿真测试和实验结果用于验证所建议的控制方法，并验证系统与控制方案的运行和有效性。