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Improved microgrid grid-connected pre-synchronization control method

A control method and pre-synchronization technology, applied in the direction of single-net parallel feeding arrangement, multi-phase network asymmetry reduction, AC network to reduce harmonics/ripples, etc., can solve the problem of poor ability to suppress harmonics, voltage resistance Problems such as three-phase unbalance and small application range can achieve the effect of suppressing harmonics, reducing voltage and current impact and power fluctuation, and eliminating influence

Active Publication Date: 2020-06-19
XIHUA UNIV
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Problems solved by technology

[0003] The existing method proposes a pre-synchronization control algorithm for microgrid inverters, which is mainly composed of droop control and pre-synchronization control; its disadvantage is that it is only applicable to the case where the main grid is an ideal grid, the applicable range is small, and it inhibits The ability of harmonics is poor, and the ability of resisting voltage three-phase unbalance is poor

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[0060] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0061] Such as figure 1 and figure 2 As shown, the embodiment of the present invention provides an improved microgrid grid-connected pre-synchronization control method, including the following steps S1 to S5:

[0062] Step S1, obtain the operating parameters of the inverter, and calculate the average active power and reactive power;

[0063] In this embodiment, the above step S1 specifically includes:

[0064] Obtain the output voltage U of the inverter through the measuring device 0 , output current I 0 , capacitor voltage U c , Inductor current I L parameters and perform park transformati...

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Abstract

The invention discloses an improved microgrid grid-connected pre-synchronization control method. The method comprises the steps of obtaining inverter operation parameters, calculating average active power and reactive power; adopting a droop control method to adjust a reference voltage amplitude and a reference angular frequency, obtaining a reference voltage through voltage synthesis; and outputting a PWM modulation signal through voltage and current double-loop control, and meanwhile, adopting a pre-synchronization control strategy to obtain an inverter error compensation angular frequency and compensate the reference angular frequency in droop control. According to the invention, the method aims at a low-voltage direct-current microgrid; and under the topological structure of a three-phase voltage source type inverter, a pre-synchronization control strategy is adopted, so that safe switching between grid connection and grid disconnection of the microgrid can be realized, voltage andcurrent impact and power fluctuation at the moment of grid connection and grid disconnection are reduced, interference caused by harmonic waves can be effectively suppressed, and the harmonic waves can be suppressed to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and in particular relates to an improved micro-grid grid-connected pre-synchronization control method. Background technique [0002] In order to enable the flexible and efficient application of distributed power, microgrid, as an emerging power technology, has attracted much attention in recent years. A microgrid is a small power system that is self-contained and can be connected to the grid or isolated. Due to the differences in the operation modes of the microgrid and the power grid, especially when the island is running, the voltage amplitude, frequency and phase of the AC bus of the microgrid will have a certain deviation from the amplitude, frequency and phase of the grid. If the microgrid is directly paralleled When connected to the grid, large voltage and current fluctuations will occur, which will affect the power quality. Therefore, the difference between the micro-grid and t...

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Application Information

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IPC IPC(8): H02J3/40H02J3/01H02J3/26
CPCH02J3/01H02J3/26H02J3/40Y02E40/40Y02E40/50
Inventor 蒋文波李潘廖官根仲明月
Owner XIHUA UNIV
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