Improved microgrid control method based on composite filtering algorithm

A technology of control method and filtering algorithm, which is applied in the direction of harmonic reduction device, single-network parallel feeding arrangement, multi-phase network asymmetry reduction, etc., can solve the problem of power loop bandwidth limitation, dynamic response speed and power pulsation suppression. Harmony, large equivalent inertia and other problems, to achieve the effect of reducing equivalent inertia, improving dynamic response performance, and enhancing flexibility

Inactive Publication Date: 2020-11-27
SICHUAN UNIV +1
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Problems solved by technology

[0005] Due to the lack of flexibility in the design of the cut-off frequency of the traditional low-pass filter, the equivalent inertia of the system using droop control is fixed and inversely proportional to the cut-off frequency of the low-pass filter
Therefore, the equivalent inertia of the system is larger
In addition, the traditional low-pass filter has a low-frequency pole, and the bandwidth of the power loop will be severely limited by the low-pass filter
There is an irreconcilable contradiction between the dynamic response speed of the system and the suppression of power fluctuations

Method used

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[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] An improved microgrid control method based on a compound filtering algorithm of the present invention, figure 1 It is a block diagram of the main circuit and control structure of the distributed inverter using droop control, and the main circuit adopts a three-phase full-bridge inverter topology. Among them, L f 、C f Respectively filter inductor and filter capacitor; U dc is the DC side voltage; L line , R line Composed of line impedance; PCC point represents the large power grid. i Labc is the three-phase current on the filter inductor; u oabc is the three-phase voltage on the filter capacitor; i oabc is the three-phase output current of the inverter. Its operating principle is: the three-phase inverter converts the DC side voltage signal into a three-phase AC signal, and after filtering through the LC filter, a three...

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Abstract

The invention discloses an improved microgrid control method based on a composite filtering algorithm. A composite filter is formed by a wave trap and a low-pass filter, the instantaneous power is subjected to composite filtering processing by using the composite filter, higher harmonics in the output power are filtered through a low-pass filtering link, and characteristic harmonics of second or other frequencies in the power are filtered through the wave trap. According to the invention, the contradiction between the dynamic response performance and the power pulsation suppression effect is effectively reconciled. The equivalent inertia of the system brought by a traditional low-pass filter is reduced and the dynamic response performance of the system is improved while it is ensured thatthe power pulsation suppression effect is superior to that of the traditional low-pass filter link.

Description

technical field [0001] The invention belongs to the field of operation control of a microgrid or a distributed power generation system, and in particular relates to an improved microgrid control method based on a compound filtering algorithm. Background technique [0002] In recent years, under the challenges of the era of energy shortage and environmental pollution, distributed power generation technology has been widely used as an effective supplement to centralized power generation based on the standpoint of giving full play to existing traditional energy sources and utilizing new energy sources. In order to solve the problems caused by the random and intermittent distributed power generation system to the safe operation of the large power grid, American scholars proposed a micro-grid system composed of multiple distributed power sources, loads and other equipment. By merging the distributed power generation system into the large power grid in the form of a micro grid, it...

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Application Information

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IPC IPC(8): H02J3/38H02J3/01H02J3/26H02J3/24
CPCH02J3/01H02J3/24H02J3/26H02J3/38Y02E40/40Y02E40/50
Inventor 马俊鹏吴子豪王辰曦唐露甜李高阳王顺亮刘天琪
Owner SICHUAN UNIV
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