Active and reactive current coordination control-based photovoltaic grid-connected inverter control method

Abstract

The invention discloses an active and reactive current coordination control-based photovoltaic grid-connected inverter control method. The method mainly comprises the steps of: firstly, introducing a capacitor current control loop into a two-stage grid-connected inverter based on a grid voltage orientation control strategy to form double current loop control; and secondly, setting a current reference value to give corresponding control strategies to a normal operation condition and a transient stability condition. The active and reactive current coordination control-based photovoltaic grid-connected inverter control method provided by the invention facilitates transient voltage recovery after a system is in a short circuit fault, and improves the transient stability of the system.

Description

technical field [0001] The present invention relates to the technical field of power system transient stability research field, in particular to a photovoltaic grid-connected inverter control method based on coordinated control of active and reactive currents. Background technique [0002] Photovoltaic power generation is an important form of solar energy utilization. Its principle is to use solar panels to convert the received light energy into electrical energy. Since light energy is inexhaustible compared with other traditional energy sources, photovoltaic power generation has the characteristics of low operating cost and inexhaustible source. With the improvement of technology and production process level, it has broad development prospects. [0003] At present, there are generally two ways to use photovoltaic power generation. One is distributed photovoltaic power generation, and the other is photovoltaic power generation connected to the grid, that is, grid-connected ...

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Problems solved by technology

Because the construction of reactive power compensation devices in domestic large and medium-sized photovoltaic power plants is backward or even does not meet the compensation requirements, the current research on reactive power and voltage control methods is mainly concentrated in the field of distributed photovoltaic power generation, and research on reactive power and voltage control in grid-connected photovoltaic power plants It is not yet widespread, so it is necessary to study reactive power and voltage control strategies suitable for large and medium-sized photovoltaic power plants

Most of the research on reactive power compensation of grid-connected photovoltaic power plants focuses on flexible power transmission equipment (FACTS) such as shunt capacitors, static var compensators (SVC) and static condensers (STATCOM), while photovoltaic grid-connected inverters are ignored. It has the function of generating reactive power and regulating voltage, which is a waste for photovoltaic power plants

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