A power grid fault simulation device and its control method

A technology for simulating device and power grid faults, applied to measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of high price, large volume, abnormal frequency, etc., and achieve the effects of engineering application, high power density, and convenient transportation

Active Publication Date: 2021-02-05
西安翌飞核能装备股份有限公司
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  • Claims
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Problems solved by technology

[0003] At present, domestic power grid fault ride-through simulation devices mainly adopt impedance divider type and power electronic type. Because of the use of reactors, the former is not only large in size, unable to realize continuous and smooth adjustment of voltage drop amplitude, but also difficult to simulate high-voltage ride-through and Abnormal frequency; although the latter can make up for the inherent defects of the impedance divider device, it mainly depends on imports and is expensive

Method used

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  • A power grid fault simulation device and its control method
  • A power grid fault simulation device and its control method
  • A power grid fault simulation device and its control method

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Embodiment Construction

[0033]The present invention will be further described below in conjunction with the drawings.

[0034]Seefigure 1 , Four-leg three-phase four-wire main circuit topology.

[0035]according tofigure 2 The positive and negative sequence separation network shown can realize the separation of positive sequence, negative sequence and zero sequence components, as follows:

[0036]According to the symmetrical component method, for a three-phase system, each phase voltage is a combination of positive sequence, negative sequence and zero sequence components, as shown in equation (1):

[0037]

[0038]For a three-phase symmetric system, its output phase voltage only contains positive sequence components, so V-=0, V0=0; and for a three-phase asymmetric system, its output phase voltage contains positive sequence, negative sequence, and zero sequence components at the same time, so V-≠0, V0≠0.

[0039]Set the rated peak value of the voltage phase voltage under the normal state of the power grid as VT, The peak val...

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Abstract

The invention provides a grid fault simulation device and a control method thereof. The power grid fault simulation device adopts the four-arm voltage source main circuit topology; based on the symmetrical component method, the positive sequence, negative sequence and zero sequence voltage commands are respectively obtained; the voltage + current double closed-loop control and the command voltage feedforward control are adopted to realize the output voltage. Accurate and fast control of frequency and frequency; by setting the depth of voltage drop and frequency value, the simulation of common grid faults such as three-phase symmetry, two-phase asymmetry, single-phase asymmetry and abnormal frequency can be realized, which can meet the requirements of photovoltaic power plants and wind farms. Fault ride through and grid adaptability test requirements. Each part of the invention has clear functions, is simple and effective, and is beneficial to engineering application.

Description

Technical field[0001]The invention belongs to the field of electrical engineering, and specifically relates to a power grid fault simulation device and a control method thereof.Background technique[0002]As the penetration rate of photovoltaic power generation and wind power generation in the power system continues to increase, their impact on the grid can no longer be ignored. Especially in China, photovoltaic and wind power use large-scale centralized access to the grid. When the grid fails, the grid connection point During a voltage drop, if photovoltaic power plants and wind turbines still adopt passive protection and unloading methods, it will result in a significant reduction in active power output, which will not only increase the difficulty of recovery of the entire system, but may even exacerbate failures, leading to the collapse of grid voltage and frequency, and serious impacts The safe and stable operation of the power grid also greatly limits the large-scale utilization ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 阚啸
Owner 西安翌飞核能装备股份有限公司
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