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Chain type converter-based power distribution network electric energy quality comprehensive control method and system

A chain-type converter and integrated control technology, which is applied in the direction of AC network circuit, AC network voltage adjustment, and AC network to reduce harmonics/ripples, etc., can solve the problem that cannot meet the comprehensive control of power quality of distribution network, and has a single function And other issues

Active Publication Date: 2017-08-18
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the active power filter (APF) with harmonic compensation function, dynamic voltage restorer (DVR) with voltage stabilization function, and SVC or STATCOM devices, due to their single function, can no longer meet the comprehensive requirements of distribution network power quality. control requirements

Method used

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  • Chain type converter-based power distribution network electric energy quality comprehensive control method and system
  • Chain type converter-based power distribution network electric energy quality comprehensive control method and system
  • Chain type converter-based power distribution network electric energy quality comprehensive control method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0093] A method for comprehensive control of power quality in distribution networks based on Y-chain converters, including two parts: a system-level control strategy and a device-level control strategy, wherein one of the system-level control strategies is as follows figure 2 As shown, the figure includes four parts: load reactive power, harmonic and unbalanced current detection, distribution network common connection point PCC fundamental wave positive sequence voltage control, PCC fundamental wave negative sequence voltage control, and comprehensive generation of the chain Type converter current control command signal. One such device-level control strategy is as image 3 , 4 and 5, where image 3 is the sub-module DC side capacitor voltage control strategy controlled by the chain-link converter, Figure 4 For the chain-link converter current control strategy, Figure 5 It is a generation method of the duty ratio feed-forward control signal of the chain-type converter. ...

Embodiment 2

[0158] All the other schemes are the same, only the formula (15) in the step 5 in the embodiment 1 is rewritten as:

[0159]

[0160] In the formula and Respectively and valid value for .

Embodiment 3

[0162] All the other schemes are the same, the formula (19) in the step 8 in the embodiment 1 is rewritten as:

[0163]

[0164] where u 03 is a non-fundamental zero-sequence voltage signal, which has:

[0165] u 03 =-0.5[max(u a ,u b ,u c )+min(u a ,u b ,u c )] (27)

[0166] overlay u 03 The DC voltage utilization rate of the converter can be improved.

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Abstract

The present invention relates to a chain type converter-based power distribution network electric energy quality comprehensive control method and system. The method includes a system-level control strategy and a device-level control strategy, wherein the system-level control strategy realizes load reactive power, harmonic and unbalanced current detection, power distribution network PCC fundamental wave positive sequence voltage control, and power distribution network PCC fundamental wave negative sequence voltage control, and comprehensively generates chain type converter current control instruction signals, and the device-level control strategy realizes sub-module direct-current side capacitor voltage control of chain type converter control, realizes three-phase conversion chain current control of a chain type converter according to a current control instruction from the system level, and generates chain type converter switching tube duty cycle signals. With the method and system provided by the technical scheme provided by the invention adopted, electric energy quality problems such as harmonic, flicker and imbalance in a power distribution network can be comprehensively controlled.

Description

technical field [0001] The invention relates to the field of power quality control of distribution networks, in particular to a method and system for comprehensive control of power quality of distribution networks based on chain-type converters. Background technique [0002] With the rapid development of power electronic technology, various power electronic devices are increasingly widely used in power systems, industries, transportation and households, especially in metallurgy, automobile manufacturing, chemical industry and other industries where a large number of strong nonlinear loads are used. A large number of harmonics and their harm are becoming more and more serious. Harmonics has become a recognized "power public nuisance" and is one of the most widely affecting power quality problems. On the other hand, a large number of impact power load equipment (such as arc welding machines, variable frequency power supplies for induction furnaces, winches and rolling mills, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18H02J3/26H02J3/12H02J3/00
CPCH02J3/00H02J3/01H02J3/12H02J3/1821H02J3/1857H02J3/26Y02E40/30Y02E40/50Y02E40/40
Inventor 王轩曹建春赵瑞斌骆健王广柱付永生李鹏燕翚王蓓蓓高宁吕宏水
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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