Three-phase swarm micro-inverter system with cluster adjuster and control method

Abstract

The invention discloses a three-phase swarm micro-inverter system with a cluster adjuster and a control method. A micro grid-connected inverter is sensitively controlled by arranging a constant swarm micro-inverter and a free swarm micro-inverter, and meanwhile, the cost is reduced; the cluster adjuster uses a particle swarm algorithm as a power algorithm, so that the power balance is adjusted and the power consumption is reduced; double-level distribution type control is used, so that the micro-inverters exchange information through a local communication network, the cluster adjuster does not need to control each micro-inverter to switch, and the long-distance communication and the cost consumption can be reduced; and when each-phase input power is varied, the entire working efficiency of the micro-inverter can be ensured by switching a sub swarm of the free swarm micro-inverter. The control method is easy to realize, so that the adverse effect on entire current output, caused by the problems that a photovoltaic cell array can not illuminate in a balanced manner, certain photovoltaic cells are damaged and the like, can be effectively solved.

Description

technical field [0001] The invention relates to a three-phase group micro-inverter system with a cluster regulator and a control method. Background technique [0002] Solar energy is clean, non-polluting, inexhaustible, and available everywhere. In today's increasingly scarce fossil energy, choosing solar energy as an alternative energy source is one of the effective ways to solve the energy crisis. Photovoltaic power generation systems generally use micro-inverters as DC-AC conversion tools. [0003] In engineering practice, photovoltaic cells should not be connected in series or parallel too much, so most photovoltaic systems use multiple micro-inverters in parallel to replace a large inverter, and each micro-inverter is connected to a photovoltaic cell array to improve Uneven illumination of photovoltaic cell arrays, individual failures, etc. have adverse effects on the overall power grid. When the three-phase grid is connected, the traditional method is to use the same...

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Problems solved by technology

When the three-phase grid is connected, the traditional method is to use the same number of micro-inverters with the same structure for each phase, which is easier to achieve power balance, but when the external conditions of each phase are different, it is easy to cause micro-inverters in a certain phase too much idle

[0004] In the multi-micro-inverter grid-connected system, if the micro-inverters are fixed and evenly distributed in the three phases of the grid, although it is easy to control, the utilization rate of the micro-inverters is limited and the topology is not flexible enough; if the micro-inverters can Freely working in any phase of the power grid will make the control cost too high; therefore, it is urgent to propose a new solar three-phase micro-inverter system and its control method to reduce power loss and improve the working efficiency of the micro-inverter

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