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Method for controlling power generation state of three-phase grid-connected photovoltaic inverter

A photovoltaic inverter and control method technology, which is applied in photovoltaic power generation, single grid parallel feeding arrangement, etc., can solve the detection of reactive load that cannot guarantee that the three-phase grid-connected photovoltaic inverter operates at the maximum benefit point and is difficult to detect. and other issues, to achieve a good promotion prospect and a wide range of effects

Active Publication Date: 2013-09-04
NANJING NARI SOLAR ENERGY TECH +2
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Problems solved by technology

[0003] The technical problem solved by the present invention is to overcome the limitations of installation location, property rights and other factors in the three-phase grid-connected photovoltaic inverter in the prior art. The problem of operating at the point of maximum benefit

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  • Method for controlling power generation state of three-phase grid-connected photovoltaic inverter
  • Method for controlling power generation state of three-phase grid-connected photovoltaic inverter
  • Method for controlling power generation state of three-phase grid-connected photovoltaic inverter

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] The power generation state control method of the three-phase grid-connected photovoltaic inverter of the present invention is based on the compensated output of reactive power, and can automatically adjust the size of the output active power and reactive power to ensure that the three-phase photovoltaic inverter always operates at the maximum Benefit points, to bring maximum benefits to users, including the following steps,

[0038] Step (A) Calculate the optimal active power reference value P of the three-phase grid-connected photovoltaic inverter output* and reactive power reference Q * ,Such as figure 1 As shown, the calculation process is as follows,

[0039] (A1) Determine the active benefit factor k of the output of the three-phase grid-connected photovoltaic inverter p and reactive benefit factor k q If the output active benefit factor is greater than...

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Abstract

The invention discloses a method for controlling the power generation state of a three-phase grid-connected photovoltaic inverter. The method comprise the following steps of: calculating an active power reference value P* and a reactive power reference value Q* which are output by an optimal three-phase grid-connected photovoltaic inverter; controlling a conduction control signal of a direct-current boosting circuit and a conduction control signal of an inverter circuit in the three-phase grid-connected photovoltaic inverter; and automatically adjusting the magnitudes of the output active power and the output reactive power to ensure that the three-phase photovoltaic inverter always runs at a maximum benefit point and brings greatest benefit to a user. The algorithm is suitable for single-stage or two-stage three-phase three-bridge-arm or four-bridge-arm grid-connected photovoltaic inverters, and has a wide application range and a good popularization prospect.

Description

technical field [0001] The invention relates to the technical field of smart grids, in particular to a method for controlling the power generation state of a three-phase grid-connected photovoltaic inverter. Background technique [0002] In practical applications, limited by factors such as installation location and user property rights, many photovoltaic inverters do not have a specific reactive power compensation object, and the power factor is generally set to 1, that is, only active power is output. Due to the reactive power compensation of the distribution network The principle is local compensation, hierarchical and partitioned balance. Therefore, it is meaningful to use the reactive power output of photovoltaic inverters to promote the optimization of distribution network power flow. The detection of reactive load, so it is impossible to measure the reactive power output of the photovoltaic inverter, and it is impossible to ensure that the photovoltaic inverter works ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 王腾飞曹陆萍颜世超
Owner NANJING NARI SOLAR ENERGY TECH
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