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Control method of miniature photovoltaic inverter having three-phase unbalance management function

A technology of photovoltaic inverter and control method, which is applied in photovoltaic power generation, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc., and can solve problems such as high power loss and unstable power generation performance

Active Publication Date: 2017-11-03
NANJING INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This structure has many disadvantages, including: large power loss, unstable power generation performance, etc.

Method used

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  • Control method of miniature photovoltaic inverter having three-phase unbalance management function
  • Control method of miniature photovoltaic inverter having three-phase unbalance management function
  • Control method of miniature photovoltaic inverter having three-phase unbalance management function

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Embodiment

[0036] The embodiment method combines the light intensity coefficient, the three-phase current unbalance degree, the fuzzy PI control algorithm and the i p -i q The models are combined according to the light intensity coefficient and the three-phase current unbalance degree μ, preliminarily determine the power distribution coefficient of photovoltaic cells, and use the fuzzy control algorithm to establish i p -i q The command current solution model adjusts the power injected by the battery components into the microgrid according to the distribution coefficient γ, and adaptively realizes functions such as harmonic current control, load reactive power compensation, and three-phase unbalance.

[0037] A micro photovoltaic inverter control method with a three-phase unbalance control function, comprising the following steps:

[0038] Use the light intensity sensor to detect the light intensity of the environment where the photovoltaic system is located in real time, and obtain th...

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Abstract

The invention provides a control method of a miniature photovoltaic inverter having a three-phase unbalance management function. The control method comprises the steps of performing real-time detection to obtain an illumination intensity coefficient Phi of a microgrid photovoltaic panel and current / voltage values of a plurality of single-phase miniature photovoltaic inverters to which a three-phase power grid is connected, calculating three-phase unbalance degree Mu, determining a power allocation efficient Gamma of a photovoltaic cell module by simultaneously combining the coefficient Phi and the unbalance degree Mu and by employing a fuzzy proportional integral (PI) control algorithm, and building an output power allocation scheme of the cell module; and building an i-i<q> instruction current solution model, subtracting load current from the solved fundamental positive-sequence component to obtain a compensation current containing harmonic, a fundamental wave negative-sequence current and a fundamental wave active power transmission current in the compensation current, and finally, adjusting the size of an injected power to a microgrid from the battery module according to the allocation coefficient Gamma. The illumination intensity coefficient, the three-phase current unbalance degree, the fuzzy PI control algorithm and the i-i<q> model are combined, and harmonic current suppression, load reactive power compensation and three-phase unbalance management are adaptively achieved.

Description

technical field [0001] The invention relates to a control method for a miniature photovoltaic inverter with the function of three-phase unbalance control. Background technique [0002] In the rural power grid, the three-phase unbalance problem of its power distribution network has been plagued by power supply units. Most of the medium and low-voltage power grids are stepped down by 10 / 0.4kV transformers, and then supply power to users in a three-phase four-wire system. [0003] Due to the uncontrollable capacity increase of single-phase users, the access of high-power single-phase loads, and the different timing of single-phase load power consumption, etc., problems such as harmonic current, load reactive power, and three-phase imbalance have been caused. If the low-voltage power grid operates under the condition of large three-phase load imbalance, it will have adverse effects on the low-voltage power grid and electrical equipment. [0004] Due to the rapid development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/26H02J3/01H02J3/18
CPCH02J3/01H02J3/1821H02J3/26H02J3/383H02J3/46H02J2203/20Y02B10/10Y02E10/56Y02E40/30Y02E40/40Y02E40/50
Inventor 张亮姜风雷孙玉坤水恒华孟高军
Owner NANJING INST OF TECH
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