Method for coordinating and controlling power of inverter capable of improving out-of-limit of photovoltaic grid connected voltage

The invention discloses a method for coordinating and controlling power of an inverter capable of improving out-of-limit of photovoltaic grid connected voltage and relates to the technical field of devices or methods of adjusting electrical variable. The method comprises the following steps: (1) the voltage US at a grid connected point during the operation of a photovoltaic grid connected voltage inverter is detected in real time, wherein the voltage upper limit Umax of the photovoltaic grid connected point is a known quantity; (2) if US is equal to or smaller than Umax, the inverter sends active power PPV in an MPPT control mode; (3) if US is greater than Umax, the inverter starts the power coordination control mode to maintain the voltage of the grid connected point at the voltage upper limit Umax. With adoption of the method, the voltage outputted by the photovoltaic inverter is enabled to respond to the voltage change of the grid connected point in real time, the active power and the reactive power of the photovoltaic inverter are dynamically distributed, the voltage of the photovoltaic grid connected point is enabled to maintain at the voltage upper limit or the voltage lower limit, the quit operating times of the inverter are reduced, and photovoltaic power generation is enabled to have the remarkable and flexible voltage regulating capacity.