Grid-connected inverter virtual inertia power decoupling control method based on predicted common point voltage

A technology of virtual inertia and power decoupling, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problems of insufficient power decoupling of grid-connected inverters, and achieve dynamic Decoupling, avoiding power coupling, and practical effects

Active Publication Date: 2018-04-27
HARBIN INST OF TECH
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of insufficient power decoupling of grid-connected inverters with virtual inertia cont

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  • Grid-connected inverter virtual inertia power decoupling control method based on predicted common point voltage
  • Grid-connected inverter virtual inertia power decoupling control method based on predicted common point voltage
  • Grid-connected inverter virtual inertia power decoupling control method based on predicted common point voltage

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specific Embodiment

[0093] In the grid-connected inverter virtual inertia power decoupling control method based on predicting common point voltage in this embodiment, an overall model of virtual inertia control is established, as shown in figure 1 As shown, the electrical parameters related to this embodiment are set as follows: DC bus side voltage U of the grid-connected inverter dc is 800V, the filter inductance is 2mH, the filter resistance is 0.05Ω, and the line resistance R g 0.5Ω, line reactance X g is 0.83Ω, virtual damping D is 0.7N m s / rad, k f is 4, k q 195, k i for 10, Q ref 3kVar, P ref It is 8kW. The method of this embodiment includes:

[0094] Step 1. According to the active power-frequency adjustment principle of the synchronous generator, design the virtual frequency regulation link: according to the relationship between the active power and frequency of the synchronous generator, perform virtual frequency regulation on the grid-connected inverter to obtain the virtual mech...

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Abstract

In order to solve a problem that power decoupling of a grid-connected inverter of existing virtual inertia control is insufficient, the invention provides a grid-connected inverter virtual inertia power decoupling control method based on a predicted common point voltage and belongs to the grid-connected inverter virtual inertia power decoupling control field in renewable energy power generation. The method comprises the following steps of step1, carrying out virtual inertia control on the grid-connected inverter and acquiring a virtual excitation electromotive force amplitude E and a rotor motion electrical angle theta of a synchronous generator; step2, making reactive power output by the grid-connected inverter be equal to a reactive power reference value and predicting a common point voltage upcc_calculate; step3, updating the E: superposing the E in the step1 and the upcc_calculate in the step2 and acquiring the updated virtual excitation electromotive force amplitude E; and step4,according to the theta in the step1 and the updated E acquired in the step3, calculating a three-phase modulated wave, and converting the three-phase modulated wave into an IGBT driving signal of a three-phase inverter bridge in the grid-connected inverter so as to realize virtual inertia control.

Description

technical field [0001] The invention relates to a virtual inertial power decoupling control method of a grid-connected inverter, which belongs to the field of decoupling control of the virtual inertial power of a grid-connected inverter in renewable energy power generation. Background technique [0002] Energy plays a vital role in the continuous development of society. In response to the increasingly prominent energy crisis and environmental pressure, renewable energy represented by distributed power sources such as solar energy and wind energy has received more and more attention from various countries. With the increasing penetration of distributed power sources including various renewable energy sources in the power grid, the moment of inertia and rotating reserve capacity in the power grid will gradually decrease, and the stability of the power grid will become more and more serious. Coupled with the unpredictability of distributed power, it is difficult to achieve plu...

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Application Information

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IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/381H02M7/5387
Inventor 武健王超赵家琦陈韬韩万琴徐殿国
Owner HARBIN INST OF TECH
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