An unbalanced load compensation device and compensation method

A compensating device and sensor technology, applied in the direction of reducing the asymmetry of the polyphase network, eliminating/reducing the asymmetry of the polyphase network, etc., can solve the problems of the three-phase load imbalance of the power grid, etc., and achieves low device hardware requirements and fast operation speed. , The effect of dynamic compensation is good

Active Publication Date: 2017-10-17
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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  • An unbalanced load compensation device and compensation method
  • An unbalanced load compensation device and compensation method
  • An 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 method in a microgrid and a low-voltage power distribution network, specifically an unbalanced load compensation device and a compensation method. The compensation method of the compensation device is used to collect the voltage and current of the power grid in real time through digital signals, and the real-time collected After the necessary filtering processing of the obtained grid voltage and current signals, the real-time collected current signals are sent to the three-two coordinate conversion system to be converted to the dq0 coordinate system, and the current is compensated and calculated, and the calculated duty cycle value is returned to abc Real-time compensation is carried out in the coordinate system, and the zero-line current is processed separately with a special fourth bridge arm, so as to achieve the purpose of real-time compensation for unbalanced loads. While completing the unbalanced load compensation, it can also monitor and protect the voltage and current of the grid and the real-time current of the IGBT, and store and process the real-time collected signals.

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 Patents(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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