Method for Optimizing the Output Voltage Waveform Quality of Cascaded Power Quality Control Devices

A technology of power quality and output voltage, applied in the direction of circuit devices, output power conversion devices, electrical components, etc., can solve the problem of degrading the output waveform quality of devices

Active Publication Date: 2021-07-06
成都精睿创新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

More generally, the n-fold frequency pulsation component on the DC voltage will be mapped to the output waveform through the PWM inverter output, generating n±1 (n is a positive integer) harmonic voltage, further deteriorating the output waveform quality of the device, and forming an output Secondary Superposition of Voltage Harmonics

Method used

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  • Method for Optimizing the Output Voltage Waveform Quality of Cascaded Power Quality Control Devices
  • Method for Optimizing the Output Voltage Waveform Quality of Cascaded Power Quality Control Devices
  • Method for Optimizing the Output Voltage Waveform Quality of Cascaded Power Quality Control Devices

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Embodiment 1

[0046] This embodiment provides a method for optimizing the output voltage waveform quality of the cascaded power quality control device, the topology of the cascaded power quality control device is as follows figure 1 As shown, it includes 3*n cascaded units; the cascaded units include three-phase uncontrolled rectifier bridges, cascaded H-bridge converters, DC / DC converters, energy storage systems, power diodes, and DC bus capacitors. The DC / DC converter contains a controller;

[0047] The cascade unit has 4 working modes:

[0048] Mode 1: Normal working mode, that is, the AC grid transmits power to the load, and the three-phase uncontrolled rectifier and cascaded H-bridge converter work normally. At this time, the cascaded unit can solve the harmonic distortion, flicker, three-phase Unbalanced and other power quality problems, and superimposed output stable 10kV voltage to achieve high-quality power supply for loads;

[0049] Mode 2: Passive discharge mode of the energy s...

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Abstract

The invention discloses a method for optimizing the output voltage waveform quality of a cascaded power quality control device, specifically: optimizing the threshold value of the output voltage waveform quality of the device through a preset device, and then comparing the obtained current operation information of the device with the preset threshold value , the current operating information of the device includes the effective value of the output current of the device, the harmonic content of the output voltage of the device, the DC bus voltage of the cascade unit, the filtered DC bus voltage of the cascade unit, the DC / DC converter current of the cascade unit, the current of the cascade unit After filtering, the terminal voltage of the energy storage system and the flag bit information of the control signal of the energy storage system are calculated and generated according to the comparison results to generate the control signal of the DC / DC converter of the cascade unit of the device, thereby adjusting the working state of the energy storage system on the DC side of the cascade unit of the device, reducing The DC side voltage ripple of the cascaded unit of the small device improves the waveform quality of the output voltage of the device.

Description

technical field [0001] The invention relates to the technical field of control of power electronic devices, in particular to a method for optimizing the output voltage waveform quality of a cascaded power quality control device. Background technique [0002] In recent years, the country has vigorously promoted the construction of smart grids and ubiquitous power Internet of Things, and has put forward high requirements for grid security, stability, and intelligent interaction. As the last gateway for the company to directly face customers, the distribution network's reliability and intelligent development level directly determine the customer's sense of gain in energy use. However, the current distribution network structure of the power grid is relatively weak, and the level of equipment configuration is generally not high. It is difficult to effectively apply a large amount of potential value data obtained by distribution transformer intelligent terminals, fault indicators,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02M1/14
CPCH02J3/00H02M1/14H02M1/143H02J2203/10
Inventor 万承宽汤浩吴迪方明
Owner 成都精睿创新科技有限公司
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