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Start and stop control method for parallelly-connected multi-unit photovoltaic grid-connected inverter system

A photovoltaic inverter, start-stop control technology, applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve the problems of large influence on the stability of the parallel system, frequent master-slave switching, etc., and achieve high overall efficiency Effect

Active Publication Date: 2015-04-22
TBEA XIAN ELECTRIC TECH +1
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Problems solved by technology

However, this scheme requires that the master should always be the one with the shortest running time among the activated inverter units, which will lead to frequent switching between the master and slave, which will have a great impact on the stability of the parallel system

Method used

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  • Start and stop control method for parallelly-connected multi-unit photovoltaic grid-connected inverter system
  • Start and stop control method for parallelly-connected multi-unit photovoltaic grid-connected inverter system

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] The start-stop control method of the parallel multi-unit photovoltaic grid-connected inverter system in this embodiment includes the following steps:

[0032] Step 1: Select the main photovoltaic inverter unit, hereinafter referred to as the main unit. When the parallel system has not yet selected the main unit or the main unit is out of operation due to failure, select the main unit. The specific method is as follows: figure 1 Shown:

[0033] After starting up, the parallel system first performs fault self-inspection. If it can operate normally, each photovoltaic inverter unit performs a state self-inspection. If a photovoltaic inverter unit sends commands to other photovoltaic inverter units at regular intervals, the photovoltaic inverter unit If the inverter unit judges that it is the master, the selection will end. Otherwi...

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Abstract

The invention discloses a start and stop control method for a parallelly-connected multi-unit photovoltaic grid-connected inverter system. The start and stop control method includes steps of selecting a main photovoltaic inverter unit, realizing highest efficiency of a parallel system; establishing a stop array (start array) of inverter units according to sequence of thermal circulation times from more to less (from less to more) of parallelly-connected photovoltaic inverter units in the start and stop conversion logic aspect of the parallelly-connected photovoltaic inverter units, and guaranteeing running time of all units to tend to be uniform. In the aspect of selecting a host, any photovoltaic inverter units which can normally run can be involved in competition with the host, and accordingly, halt of the parallel system caused by breakdown of the host is avoided.

Description

technical field [0001] The invention relates to the technical field of photovoltaic grid-connected inverters, in particular to a start-stop control method for a parallel multi-unit photovoltaic grid-connected inverter system. Background technique [0002] Since the output power of photovoltaic grid-connected inverters changes with the intensity of sunlight, the start and stop of each parallel inverter unit should follow this change and not happen at the same time. Therefore, it is necessary to establish a mechanism to control the start and stop of parallel units. This mechanism is designed to solve the following three problems: first, when to start (shut down) the next inverter unit; second, which inverter unit to start (shut down) stop (run); third, by Which one of the parallel inverters will lead the execution of the start-stop operation of the entire system. A reasonable mechanism should have three functions: first, start an appropriate number of parallel units to maxim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 段睿周洪伟刘永奎熊俊峰
Owner TBEA XIAN ELECTRIC TECH
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