A power-saving device for dynamically filtering out harmonics

一种节电装置、滤除的技术，应用在谐波降低装置、用于限制过电流/过电压的紧急保护电路装置、电路装置等方向，能够解决无源滤波器响应速度慢、补偿效果影响、滤除次数有限等问题，达到吸收无功连续、消除谐波、响应速度快的效果

Active Publication Date: 2019-12-13
ZHEJIANG YONGYUAN XINNENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has the advantages of simple structure and low cost, there are still many defects: because it uses capacitance and reactance to form a harmonic low-pass circuit, and each harmonic component requires a filter circuit, so the number of filtering is very high. Limited; the passive filter is seriously affected by the system impedance, and there is a danger of harmonic amplification and resonance; the response speed of the passive filter is slow, and when the load changes greatly, it will have a greater impact on the compensation effect; when the harmonic When the amount is greater than the compensation capacity, the passive filter may be damaged due to overload; therefore, the passive filter is only suitable for harmonic source loads with simple and stable systems and little change in load

Method used

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  • A power-saving device for dynamically filtering out harmonics
  • A power-saving device for dynamically filtering out harmonics
  • A power-saving device for dynamically filtering out harmonics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A power-saving device for dynamically filtering out harmonics, characterized in that it includes a chassis and a power-saving device body disposed in the chassis, and the power-saving device body includes:

[0031] The control unit automatically detects the harmonics in the power grid through the sampling unit, and feeds them back to the control chip, so that it can output compensation currents that are equal in size and opposite in direction to offset the harmonic currents in the power grid;

[0032] Safety protection device, through the use of low-voltage control circuit to improve the safety of manual operation;

[0033] The bypass control unit controls the switching of bypass / power saving by controlling the contactor group's pull-in;

[0034] Voltage stabilizing device, when the input voltage or load changes, the control circuit performs sampling, comparison and amplification, and then drives the servo motor to rotate;

[0035] The sampling unit automatically detec...

Embodiment 2

[0039]The power-saving device also includes a cabinet body (1); an installation partition (18) is installed in the middle of the interior of the cabinet body (1); the front upper side of the installation partition (18) is provided with a brace ( 2); one side of the front of the brace (2) is provided with a wiring device (3); the terminal of the wiring device (3) is connected with a cable a (4); the cable a ( The other end of 4) is connected with acquisition unit (5); The underside of described acquisition unit (5) is provided with bypass control unit (7); Described bypass control unit (7) and acquisition unit (5) There is a cable b(6) between them; the lower part of the bypass control unit (7) is connected to a cable c(8); the other end of the cable c(8) is connected to a power-saving unit ( 9); one side of the acquisition unit (5) is provided with an integrated control unit (10); the integrated control unit (10) includes a control chip (11); the lower part of the integrated c...

Embodiment 3

[0044] The dynamic harmonic filtering method of the device detects the harmonic content in the power grid in time through its own detection device, and injects accurate compensation current into the power grid through the feedback system, thereby eliminating the harmonics in the power grid. The built-in bypass control unit controls the switching of the bypass to save power by controlling the contactor group's pull-in. It can effectively suppress the surge and stabilize the voltage while controlling the harmonics of the power grid.

[0045] When the present invention is actually implemented, the cabinet body 1 is opened by the fingerprint lock 26 or the common lock 33, and the internal wiring device 3 is wired, and finally the lead wire is drawn out from the outlet hole 30 to complete the wiring work; the operation of the air circuit breaker Turn the handle to the ON position, and then turn the boat-shaped knife melting switch 14 to the ON position; the indicator lights 25 are a...

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Abstract

The invention discloses a power saving device for dynamically filtering harmonic wave, the device comprises a case and a power saving device body arranged in the case, the power saving device body comprises a control unit, a safety protection device, a by-pass control unit, a sampling unit, a surge treatment device and a switching control key which is arranged on external of the case and is used for manually switching by-pass / by-pass in power saving state. According to the invention, the power saving device can timely detect harmonic wave content in a power grid through a detection device of the power saving device, precise compensating current is outputted through a feedback system to the power grid, so that the harmonic wave in the power grid is eliminated, the power saving device comprises the by-pass control unit, the by-pass / power saving switching can be controlled by controlling actuation of contactor group, the power grid harmonic wave is managed, and the surge can be effectively restrained and the voltage can be effectively stabilized.

Description

technical field [0001] The invention relates to the technical field of power-saving equipment, in particular to a power-saving device and method for dynamically filtering out harmonics. Background technique [0002] At present, the most widely used harmonic control is the use of passive filters. Passive filter, also known as LC filter, is a filter circuit composed of a combination of inductors, capacitors and resistors, which can mainly filter out the 3rd, 5th, and 7th harmonics. Although it has the advantages of simple structure and low cost, there are still many defects: because it uses capacitance and reactance to form a harmonic low-pass circuit, and each harmonic component requires a filter circuit, so the number of times of filtering is very high. Limited; the passive filter is seriously affected by the system impedance, and there is a danger of harmonic amplification and resonance; the response speed of the passive filter is slow, and when the load changes greatly, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/12H02J3/18H02H9/02H02H9/04H02B1/56H02B1/20H02B1/30
CPCH02B1/20H02B1/30H02B1/565H02H9/02H02H9/04H02J3/01H02J3/12H02J3/18Y02E40/30Y02E40/40
Inventor 陈勇华金科冉赵洋
Owner ZHEJIANG YONGYUAN XINNENG TECH CO LTD
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