Abstract: A HiL testing platform for a photovoltaic power station and a PPC performance testing method are provided. The HiL testing platform includes: a PPC, an inverter controller, and a HiL real-time simulator. Each of the PPC, the inverter controller, and the HiL real-time simulator is arranged with an upper computer. The PPC is configured to communicate with the inverter controller according to a predetermined communication protocol. The HiL real-time simulator is connected to the PPC and the inverter controller through a digital input interface and/or an analog output interface, and is configured to simulate a testing device in the photovoltaic power station in a digital model form.

Abstract: A photovoltaic grid-connected system and a control method therefor. The photovoltaic inverter is connected to the grid through a synchronous motor back-to-back drive system including two synchronous motors. The photovoltaic inverter is controlled to operate in the current source mode after the photovoltaic grid-connected system is started, the synchronous motor back-to-back drive system is controlled to operate in the generator mode, and the excitation current of the first synchronous motor is controlled to maintain the voltage stability of the AC side of the photovoltaic inverter. Therefore, the stability and safety of the power grid is significantly improved and the impact of intermittent new energy on the power grid is reduced by virtue of the characteristics of the synchronous motor, and the maximum power point of the photovoltaic array can be tracked to avoid loss of power generation, and traditional photovoltaic inverters can be used without any modification.