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Unbalanced load compensation device and compensation method

A compensation device and sensor technology, applied in the direction of reducing asymmetry of multi-phase network, eliminating/reducing asymmetry of multi-phase network, etc., can solve problems such as unbalanced three-phase load of the power grid, achieve low hardware requirements of the device, and achieve dynamic compensation effects Good, fast operation effect

Active Publication Date: 2015-02-18
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0005] In order to solve the problem that the unbalanced three-phase load of the power grid cannot be effectively solved, the present invention provides an unbalanced load compensation device and compensation method

Method used

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  • Unbalanced load compensation device and compensation method

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Embodiment Construction

[0022] An unbalanced load compensation device, including a three-phase four-arm full-bridge inverter circuit composed of two series-connected IGBTs, a Hall voltage sensor, a Hall current sensor, and a digital phase-locked loop program written in it. The signal processor DSP and PWM drive module, the digital signal processor DSP includes a proportional integral controller, the input end of the three-phase four-bridge arm full-bridge inverter circuit is connected to the three-phase four-wire grid through an inductor, and the three-phase four-arm full-bridge inverter circuit is connected to the three-phase four-wire grid. The output terminal of the bridge inverter circuit is connected to the DC side capacitor and connected to the DC voltage input terminal of the digital signal processor DSP. The primary sides of the Hall voltage sensor and the Hall current sensor are connected to the three-phase four-wire grid. The Hall voltage The secondary side of the sensor and the Hall current...

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Abstract

The invention relates to a compensation device and a compensation method applied in microgrids and low-voltage power distribution grids, and in particular relates to an unbalanced load compensation device and an unbalanced load compensation method. The compensation method utilizing the compensation device comprises the following steps: carrying out real-time acquisition on the voltages and the currents of a power grid via digital signals; carrying out necessary filtering processing on power grid voltage and current signals acquired in real time, then sending the current signals acquired in real time into a three-two coordinate transformation system, transforming the current signals into a dq0 coordinate system and performing compensation calculation on the currents; returning a duty ratio obtained in a calculation manner into an abc coordinate system so as to perform real-time compensation, and carrying out single processing on a fourth bridge arm specially used for a zero line current, thereby realizing the purpose of real-time compensation of unbalanced loads. According to the method, the voltages and currents of the power grid and the real-time currents of an IGBT (Insulated Gate Bipolar Transistor) can be monitored and protected while the compensation of unbalanced loads is finished at the same time, and the signals acquired in real time are stored and processed.

Description

technical field [0001] The invention relates to a compensation device and method in an electric low-voltage distribution network, in particular to an unbalanced load compensation device and a compensation method. Background technique [0002] In the existing traditional three-phase four-wire distribution transformer wiring system in China, due to various reasons such as the low-voltage single-phase load cannot be fully divided manually, the actual operating rate of the distributed load is different, and the three-phase load is unbalanced. It is inevitable. And this unbalanced three-phase load will inevitably lead to increased loss, decreased power efficiency, increased zero-sequence current, and shortened service life of equipment. [0003] Harm to the transformer: The unbalanced three-phase load will make the transformer run asymmetrically, which will increase the loss of the transformer. According to the transformer operating regulations, the neutral current of the trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 贾庆英韩肖清孟润泉曹国栋张惠生丁荣风梁暄王凯武
Owner STATE GRID CORP OF CHINA
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