An intelligent rotation dormancy control method for modular photovoltaic inverters

Abstract

The invention relates to an intelligent alternate dormancy control method of a modular photovoltaic inverter. The method comprises the following steps: according to the quantity of photovoltaic inverter modules currently at an operation state, rated power of each photovoltaic inverter module and total output power, calculating a load rate of a current photovoltaic inverter, and if the load rate of the current photovoltaic inverter is smaller than an optimal load rate lower limit value, successively cutting off the currently operating photovoltaic inverter modules until the load rate of the current photovoltaic inverter is higher than the optimal load rate lower limit value; and if the load rate of the current photovoltaic inverter is greater than an optimal load rate upper limit value, successively switching inverter modules which are at a shutdown state until the load rate of the current photovoltaic inverter is lower than the optimal load rate upper limit value. The control method provided by the invention enables the load rate of the current inverter to be always at an optical load rate interval, improves the conversion efficiency of an inverter system in case of different loads and reduces energy loss.

Description

technical field [0001] The invention relates to an intelligent rotation dormancy control method of a modularized photovoltaic inverter. technical background [0002] Efficiency is becoming an increasingly concerned design indicator in power electronic devices. In some application fields, efficiency has become one of the main indicators of competition in industry development, such as new energy photovoltaic power generation and wind power generation industries, converter efficiency The improvement can bring direct economic benefits, so it has a greater competitive advantage. [0003] The European efficiency is obtained by accumulating the efficiency under different load conditions according to different proportions, and the weighting coefficients of different power points of the inverter are shown in Table 1. [0004] Table 1 Weighting coefficients of different power points of the inverter [0005] rated power point 5％ 10％ 20％ 30％ 50％ 100％ ...

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Problems solved by technology

[0008] The present invention proposes an intelligent rotation dormancy control method for modularized photovoltaic inverters to solve the problem that the centralized photovoltaic inverters of existing photovoltaic power stations have large load rate changes and cannot work at the highest efficiency point all the time.

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