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.
CN103278722BActive Publication Date: 2015-03-11CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
Publication Date
2015-03-11

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More