Equal power distribution control method of multiple parallel single-phase inverters for solar power generation

Abstract

The invention discloses an equal power distribution control method of multiple parallel single-phase inverters for solar power generation. In the invention, a parallel single-phase multi-inverter system for solar power generation is composed of a plurality of parallel inverters. The equal power distribution control method has the beneficial effects that by means of combination of a PID (proportion integration differentiation) control method and a deadbeat control method, the disadvantages of a voltage and current dual-loop PID control mode are overcome so as to achieve higher reliability, higher stability and faster dynamic response for equal power distribution control of the parallel inverters, thus better meeting the requirement for parallel operation of the inverters.

Description

technical field [0001] The invention relates to the technical field of electrical automation, in particular to a single-phase solar power generation multi-inverter parallel power sharing control method. Background technique [0002] Parallel connection of multiple inverters can realize large-capacity power supply and redundant power supply, which is recognized as one of the important directions for the development of inverter technology today. Compared with a single high-power inverter, multiple low-power inverters connected in parallel can not only reduce costs, facilitate maintenance, but also be more flexible and reliable. By changing the number of parallel inverters, different capacities can be obtained; through redundant parallel inverters, the reliability of the system can be improved. [0003] The solar power generation system composed of multiple inverters is an important way to vigorously develop renewable energy, improve the reliability of power supply, and expand...

AI Technical Summary

Problems solved by technology

Although the traditional PID regulator has good control adaptability, simple and clear algorithm, and is easy to implement with a single-chip microcomputer or DSP, it has its own limitations: on the one hand, the sampling and quantization error of the system reduces the control accuracy of the algorithm; on the other hand, sampling and Calculation delay makes the controlled system a system with pure time lag, which reduces the stable domain of the PID controller and increases the difficulty of design

While the PID regulator itself has limitations, the current inner loop proportional P regulation has no integral link, resulting in poor system stability and control accuracy

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