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Voltage drop control method and device

A technology of voltage sag and control method, applied in the field of mobile power grid, can solve the problems of large impulse voltage or impulse current, affecting the effect of low voltage ride through test of wind power/photovoltaic system, etc.

Active Publication Date: 2015-03-11
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the voltage drop device implemented based on impedance voltage division realizes the voltage drop control, it will generate a large surge voltage or current due to the simultaneous action of the switches of the two voltage divider reactors.
This phenomenon will seriously affect the low voltage ride through test effect of wind power / photovoltaic system

Method used

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  • Voltage drop control method and device

Examples

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Effect test

Embodiment 1

[0058] The present invention provides a voltage drop control method, the following is the description of Embodiment 1 as an example, please refer to figure 1 , which is a flow chart of a voltage drop control method disclosed in Embodiment 1 of the present invention, specifically including:

[0059] S101: set the initial state of the voltage drop device as follows: the parallel switch K1 is in the closed state, and the series switch K2 is in the open state;

[0060] The main circuit topology diagram of the voltage drop generator based on the form of impedance division is as follows: figure 2 As shown, the specific working principle of the voltage drop generator is: through the appropriate matching of impedance L1 and impedance L2, the expected voltage drop function is realized; for example: open the circuit breaker K1 on the side of impedance L1, and open the circuit on the side of closed impedance L2 The circuit breaker K2 on the impedance L1 side closes the circuit breaker ...

Embodiment 2

[0076]In order to describe the control method provided by the present invention in more detail, a specific application scenario is taken as an example below. It should be noted that there are three-phase power grid voltage circuits in the voltage drop generator based on impedance division, respectively called A Phase circuit, B-phase circuit, and C-phase circuit, the preset control command in this embodiment is: act represents the value of the input control grid voltage drop type, when act is less than or equal to 0, the entire control method is not started, and the grid voltage In the normal state; when 0

Embodiment 3

[0093] Correspondingly, the present invention also provides a voltage drop control device. The third embodiment is described below as an example. For details, please refer to Figure 4 A structural schematic diagram of a voltage drop control device is shown, specifically including:

[0094] The setting module 401 is used to set the initial state of the voltage dropper as follows: the parallel switch K1 is in the closed state, and the series switch K2 is in the open state;

[0095] A trigger module 402, configured to trigger a corresponding circuit to perform drop control according to the control command type;

[0096] The first control module 403 is configured to control the parallel switch K1 and the series switch K2 to be in the same state when receiving the control command, and start the first timer to start counting;

[0097] The second control module 404 is configured to control the parallel switch K1 to be in the off state and the series switch K2 to be in the closed st...

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Abstract

The invention discloses a voltage drop control method and device. The voltage drop control method comprises the steps that the initial state of a voltage drop generator is set in this way: a switch K1 in parallel connection is in a closed state, and a switch K2 in series connection is in a disconnected state; the switch K1 in parallel connection and the switch K2 in series connection in corresponding circuits are respectively controlled to be closed or disconnected according to a control command, so that partial drop, full drop, partial recovery and full recovery of a network voltage are realized in sequence; through control over three-phase parallel connection between the voltage drop generator and the K1 and three-phase series connection between the voltage drop generator and the switch K2, the switch K1 and the switch K2 are closed or disconnected according to the control command at preset time. Therefore, step-by-step drop and step-by-step recovery of the network voltage are realized, and an overvoltage or overcurrent phenomenon caused by simultaneous action of the two switches can be effectively avoided.

Description

technical field [0001] The invention relates to the field of mobile power grids, in particular to a voltage drop control method and device. Background technique [0002] As a kind of green renewable energy, wind power / photovoltaic power generation has attracted much attention. As the installed capacity of wind turbines accounts for an increasing proportion of the grid, the wind power generation system is connected to the grid through the grid-connected inverter. When the grid fails and the voltage drops to a certain extent, the grid-connected inverter will be disconnected from the grid; The penetration power of wind power generation continues to increase. If a large number of wind power generation systems are disconnected from the grid when the grid fails, it will have a serious impact on the voltage and frequency of the grid, and may even aggravate the degree of failure, eventually leading to the decoupling of all system units. Therefore, the operation ability of wind turb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 张杰李云王坚李江红张宇谭娟陈柳松范祝霞
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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