A control system and control method for improving voltage quality of microgrid
A technology for controlling system and voltage quality, applied in the field of power system, which can solve the problems of small capacity, small inertia, frequency and voltage deviation of microgrid
Inactive Publication Date: 2016-08-24
XIAN UNIV OF TECH
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[0004] The purpose of the present invention is to provide a control system for improving the voltage quality of the micro-grid, which solves the problem of frequency and voltage deviation caused by load changes due to the small capacity and inertia of the micro-grid in the prior art
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[0075] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0076] The present invention is a control system for improving the voltage quality of the microgrid, the structure is as follows figure 1 As shown, it includes a pair of back-to-back converters VSC1 and VSC2 connected between the distribution network 1 and the microgrid 2. There is a DC side capacitor C connected in parallel between the converters VSC1 and VSC2. The converter VSC1 and the distribution network Reactor L1, resistor R1 and switch circuit breaker CB1 are also connected in sequence between 1, capacitor C1 is also connected between resistor R1 and switch circuit breaker CB1 and then grounded, and reactance is also connected in sequence between converter VSC2 and microgrid 2 L2, resistor R2 and switch circuit breaker CB2, by cooperating to control the two switch circuit breakers CB1 and CB2, the microgrid is in the grid-connected or...
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The invention discloses a control system for improving the voltage quality of a microgrid, comprising a pair of converters VSC1 and VSC2 connected back-to-back between a distribution network and a microgrid, and a DC side capacitor is connected in parallel between the converters VSC1 and VSC2 C. Reactor L1, resistor R1 and switch circuit breaker CB1 are also connected in sequence between the converter VSC1 and the distribution network, and capacitor C1 is also connected between the resistor R1 and the switch circuit breaker CB1 and then grounded. A reactor L2, a resistor R2 and a switch circuit breaker CB2 are also connected between the power grids in sequence, and a capacitor C2 is also connected to the ground between the resistor R2 and the switch circuit breaker CB2. The invention also discloses a control method for improving the voltage quality of the microgrid. The invention solves the problems of frequency and voltage deviation in the prior art due to the small capacity and low inertia of the microgrid when the load changes.
Description
technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a control system for improving the voltage quality of a microgrid, and also relates to a control method for improving the voltage quality of a microgrid. Background technique [0002] The microgrid is a controllable system composed of several distributed generation (Distributed Generation, DG), energy storage devices and local loads. It has two operating modes: island and grid-connected, in which DG is usually connected to the grid through a voltage source converter. . Usually, the droop characteristic is applied to DG to output the desired power to ensure the power flow regulation and voltage stability of the grid. When the microgrid is connected to the grid, the fluctuation of voltage amplitude and frequency in the grid will affect the DG and load in the microgrid. Moreover, the capacity of the microgrid is small, and most micropower sources are intermittent...
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IPC IPC(8): H02J3/12
Inventor 张晓滨程思雨张攀杨波曾光
Owner XIAN UNIV OF TECH