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DC side voltage fluctuation compensation control method of power quality comprehensive treatment device

A technology for DC side voltage and power quality, applied in circuit devices, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., can solve problems such as the influence of power quality control accuracy, eliminate voltage fluctuations, and improve accuracy Effect

Active Publication Date: 2021-12-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the problem that the DC side voltage fluctuation of the power quality comprehensive treatment device in the prior art affects the accuracy of power quality treatment, and provides a DC side voltage fluctuation compensation control method for the power quality comprehensive treatment device

Method used

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 As shown, a DC side voltage fluctuation compensation control method of a power quality comprehensive treatment device includes the following steps: S1: collecting current signals used for the control of the voltage outer loop controller and the current inner loop controller by the current sensor; S2: using the filter The inverter extracts the power quality parameters of the load current, and feeds back to the inverter to measure the voltage; S3: Use the fundamental wave loop to obtain the fundamental current control command, and the harmonic loop performs no static error tracking on the fundamental current control command; S4: S2 The obtained power quality parameters are used as the control signal of the power quality comprehensive treatment device to control the switching action of the power device, that is, the feedfor...

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Abstract

The invention discloses a DC side voltage fluctuation compensation control method of a power quality comprehensive treatment device. The DC side voltage fluctuation compensation control method comprises the following steps that S1, a current sensor collects current signals used for controlling a voltage outer loop controller and a current inner loop controller; s2, performing electric energy quality parameter extraction on the load current by using a filter, and feeding back the electric energy quality parameter to an inverter to measure voltage; s3, acquiring a fundamental current control instruction by using a fundamental wave ring, and performing zero static error tracking on the fundamental current control instruction by using the harmonic wave ring; and S4, taking the electric energy quality parameter obtained in the S2 as a control signal of the power quality comprehensive treatment device, and generating a compensation current after the control signal is processed by the voltage outer loop controller, the current inner loop controller and a feedforward control loop. The direct-current side voltage of the power quality comprehensive treatment device is compensated, the voltage fluctuation of the direct-current side is eliminated, and therefore, the power quality treatment precision is improved.

Description

technical field [0001] The invention relates to the field of comprehensive power quality management and control, in particular to a method for compensating and controlling DC side voltage fluctuations of a power quality comprehensive treatment device. Background technique [0002] Power quality control is mainly managed through special devices, that is, various power control devices are installed at the position where the load is connected to the grid to ensure that the grid-connected current and voltage meet the requirements, thereby effectively controlling the power quality. In the power quality integrated control device, the essence of current compensation is to change the current flow direction through the PWM rectifier bridge, thereby generating various compensation currents. The stable operation of the DC side is the basis of the current in-loop control, so the voltage fluctuation of the DC side affects the accuracy of the control. Therefore, the stability of the DC s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/01
CPCH02J3/24H02J3/01H02J2203/20Y02E40/40
Inventor 潘国兵金丽炳龚飞周英浩
Owner ZHEJIANG UNIV OF TECH