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Method for uniformly controlling distribution type grid-connected power generation and active power filter

A power filter and distributed power supply technology, applied in active power filtering, AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve low equipment utilization, power grid stability, high APF cost, Expansion is difficult and other problems, so as to avoid low utilization rate of equipment, improve power quality, and overcome high cost

Inactive Publication Date: 2010-10-20
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] In order to overcome the low utilization rate of grid-connected inverter equipment and the impact on grid stability due to frequent switching, as well as the disadvantages of high cost, single function and difficult expansion of APF, the distributed grid-connected power generation of the present invention is unified with APF When the distributed power output capacity reaches a certain value, the grid-connected inverter selectively compensates the grid for harmonics while realizing grid-connected, otherwise it acts as an active filter for harmonic compensation

Method used

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  • Method for uniformly controlling distribution type grid-connected power generation and active power filter
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  • Method for uniformly controlling distribution type grid-connected power generation and active power filter

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Embodiment Construction

[0024] exist figure 1 When terminal 1 of K is closed, the inverter is in active filtering mode, and the DC side voltage is stabilized by the PI controller. If the DC side voltage is lower than the reference voltage, the inverter increases the DC voltage by absorbing active energy from the grid; otherwise, it injects active energy into the grid to reduce the DC voltage. Then the command current is compared with the actual compensation current, and then an adaptive hysteresis comparison controller is used to generate a PWM signal to drive the inverter to realize the compensation of reactive power and harmonics of the grid. When the 2 terminals of K are closed, the inverter is in the unified control mode of grid connection and active filter. According to the command current synthesized by active power command current, reactive current and harmonic current of distributed grid-connected power generation, grid-connected power generation and reactive power and harmonic current compe...

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Abstract

The invention discloses a method for uniformly controlling distribution type grid-connected power generation and an active power filter (AFP). When the output capability of a distribution type power supply reaches a certain value, a grid-connected inverter realizes grid connection, the power grid is selectively carried with harmonic compensation; or else, the grid-connected inverter is used as an active filter to carry out harmonic compensation, thereby prolonging the service life and improving the utilization rate of the system. By adopting the novel harmonic detection and self-adaptation hysteresis comparison control method, the invention realizes the uniform control of the distribution type grid-connected power generation and the APF, overcomes the defects of high cost, single function and large expanding difficulty of the APF, avoids low utilization rate of grid-connected inverter equipment and the influence on the stability of the power grid, caused by frequent switching, greatly improves the quality of the electric energy of the power grid, enhances the utilization rate of the inverter, and supports the economic operation of the power grid.

Description

technical field [0001] The invention relates to a method for unified control of distributed grid-connected power generation and active power filter (APF). When the distributed power output capacity reaches a certain value, the grid-connected inverter selectively compensates the grid for harmonics while realizing grid-connected; otherwise, the grid-connected inverter acts as an active filter for harmonic compensation, Improve system life and utilization. A new type of harmonic detection and grid-connected generation active command current synthesis algorithm and adaptive hysteresis comparison control are adopted to realize unified control research. Background technique [0002] With the enhancement of users' awareness of environmental protection, higher requirements are put forward for the reliability and economy of power supply, and the distributed generation (Distributed Generation) technology based on the development and utilization of new energy has become a new research...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/01H02J3/18
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 夏向阳龚芬
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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