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Virtual harmonic resistance control method of grid-connected inverter based on parabolic method

A resistance control, inverter technology, applied in AC network to reduce harmonics/ripples, harmonic reduction devices, AC network circuits, etc., can solve problems such as waste of resources

Active Publication Date: 2022-01-04
JIANGSU ELECTRIC POWER CO
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Problems solved by technology

[0002] The traditional grid-connected inverter is a key link to realize new energy grid-connected power generation, and its capacity is generally larger than that of new energy grid-connected power generation under rated conditions, that is, there is about 20% of the remaining capacity, which is a kind of resource waste

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  • Virtual harmonic resistance control method of grid-connected inverter based on parabolic method
  • Virtual harmonic resistance control method of grid-connected inverter based on parabolic method
  • Virtual harmonic resistance control method of grid-connected inverter based on parabolic method

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Embodiment Construction

[0060] The specific embodiments of the virtual harmonic resistance control method of the grid-connected inverter based on the parabolic method of the present invention will be described in detail below with reference to the accompanying drawings.

[0061] The invention provides the following "virtual harmonic resistance" control strategy technical scheme of grid-connected inverter based on parabolic method, which mainly includes mathematical modeling of grid-connected inverter, principle analysis of harmonic resistance, harmonic power maximization, Virtual harmonic resistance control, virtual harmonic resistance algorithm based on parabolic method, overall control of grid-connected inverters.

[0062] 1. Mathematical modeling of grid-connected inverters

[0063] according to figure 1 , the mathematical model of the grid-connected inverter in the abc three-phase stationary coordinate system can be established as:

[0064]

[0065] where V dc is the DC side capacitor volta...

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Abstract

The invention provides a virtual harmonic resistance control method of a grid-connected inverter based on a parabolic method, including: mathematically modeling the grid-connected inverter; calculating and obtaining the h-order harmonic voltage function of the grid-connecting point; calculating and obtaining the h-order harmonic Wave power and the optimal resistance function of the h-order harmonic resistance; use the parabola method to find the best resistance value of each virtual harmonic resistance; extract each harmonic voltage of the grid-connected point, and use the searched virtual harmonic resistance to generate Harmonic reference current; the new energy power generation power loop generates a fundamental reference current, which is superimposed on the harmonic reference current; the obtained total reference current is used for current inner loop control to generate a drive signal for a three-phase grid-connected inverter. Based on the parabola method, the invention adjusts the virtual resistance value of each harmonic in real time online to make it reach the optimal resistance value of each harmonic, thereby absorbing the harmonic power from the grid to the greatest extent.

Description

technical field [0001] The invention relates to the control field of grid-connected inverters, in particular to a virtual harmonic resistance control method of grid-connected inverters based on a parabolic method. Background technique [0002] The traditional grid-connected inverter, as a key link to realize new energy grid-connected power generation, generally has a larger capacity than the new energy grid-connected power generation power under rated operating conditions, that is, there is about 20% of the remaining capacity, which is a kind of resource. waste. Therefore, the present application adopts a "virtual harmonic resistance" control algorithm of the grid-connected inverter, which utilizes the remaining capacity of the grid-connected inverter to absorb harmonic power, thereby controlling the power quality. The "virtual harmonic resistance" is a control algorithm used in grid-connected inverters to realize power quality management. This control method only needs to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/38H02J3/01H02J2203/20Y02E40/40
Inventor 胡卫丰周宇沙骏周洪益柏晶晶胥峥
Owner JIANGSU ELECTRIC POWER CO
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