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Dynamic voltage restorer for realizing smooth switching of different operation modes of microgrid

A technology of dynamic voltage recovery and operation mode, applied in the direction of AC network voltage adjustment, AC network load balancing, etc., can solve problems such as instantaneous voltage disturbance, and achieve the effect of ensuring power supply reliability and improving utilization.

Active Publication Date: 2014-12-03
JIANGSU UNIV
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Problems solved by technology

[0006] Aiming at the problem of instantaneous voltage disturbance in the current microgrid in grid-connected operation mode and switching from grid-connected to islanded operation mode, the present invention proposes a dynamic voltage restorer that realizes smooth switching of different operating modes of the microgrid to solve the problem of Transient power quality problems in the microgrid to ensure the reliability of power supply for sensitive loads in the microgrid

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  • Dynamic voltage restorer for realizing smooth switching of different operation modes of microgrid
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  • Dynamic voltage restorer for realizing smooth switching of different operation modes of microgrid

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] see figure 1 As shown, it is based on the structure diagram of the DVR device that realizes the smooth switching of different operating modes of the microgrid. The DVR device system includes wind turbines, wind turbine rotor side AC / DC converters, battery packs, DC / DC converters, hybrid cascaded H-bridge multi-level inverters with pulse width modulation (Pulse Width Modulation, PWM) function converters and rectifiers with power factor correction circuits, and control circuit breakers QF 2 Semiconductor switch for trip coil and power semiconductor switches , , . figure 1 middle, is the equivalent power supply voltage, that is, the distribution network voltage, is the voltage of the sensitive load in the microgrid; It is a static switch, which serves as the common connection point and separation point between the microgrid and the distrib...

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Abstract

The invention discloses a dynamic voltage restorer (DVR) for realizing smooth switching of different operation modes of a microgrid. The DVR uses a hybrid cascade H-bridge multi-level inverter topological structure as a main-body frame. A DC energy storage unit adopts a built-in wind turbine generator-storage battery of the microgrid and is serially connected between a power distribution network and a sensitive load in the microgrid through a filtering unit. The DVR is capable of working at three kinds of operation modes with the microgrid: a grid connection operation method, a grid-connection-to-island switching operation method and an island method. When it is detected that a microgrid system is to switch between two kinds of operation modes, the DVR rapidly moves and injects a compensation voltage to the system so that the microgrid is capable of smoothly transiting from one operation mode to the other operation mode. The DVR ensures the power supplying reliability of the sensitive load in the microgrid; and a transient electric energy quality problem which happens in the microgrid can be solved and a standby state of an original DVR is reduced in a large degree and thus device utilization rate is improved.

Description

technical field [0001] The invention relates to a dynamic voltage restorer for realizing smooth switching of different operating modes of a microgrid, which belongs to the field of analysis and treatment of transient power quality disturbance signals, and is particularly suitable for controlling transient voltage disturbances that occur when a microgrid switches between different operating modes . Background technique [0002] With the popularization of the smart grid concept and the deepening of various research work in recent years, it is the next development direction of the power grid to connect the distributed generation energy supply system to the large power grid in the form of a micro grid. Although the microgrid has many advantages such as flexibility, accessibility, reliability, and economy, there are two operating modes of the microgrid: grid-connected and islanded. When switching between these two operating modes, there will be an instant During the process of v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/28
Inventor 黄永红徐俊俊刘国海孙玉坤
Owner JIANGSU UNIV
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