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A Method for Reducing Harmonic Generation and Current Impact of Electric Heating Resistance Inductive Load

A technology of load harmonics and current impact, applied in the modification of power electronics, high-efficiency power electronics conversion, cooling/ventilation/heating transformation, etc., can solve the problems of large harmonic currents and reactive power consumption of diode rectifier circuits

Active Publication Date: 2022-03-29
HENGLI ELETEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for reducing harmonic generation and current impact of electric heating resistive load, which solves the problem that a large amount of harmonic current will be generated by a diode rectifier circuit and consume part of reactive power

Method used

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  • A Method for Reducing Harmonic Generation and Current Impact of Electric Heating Resistance Inductive Load
  • A Method for Reducing Harmonic Generation and Current Impact of Electric Heating Resistance Inductive Load
  • A Method for Reducing Harmonic Generation and Current Impact of Electric Heating Resistance Inductive Load

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no. 1 example

[0033] Please refer to figure 1 , figure 2 ,in, figure 1 A schematic diagram of the first embodiment of the method for reducing electric heating resistive load harmonic generation and current impact provided by the present invention; figure 2 Circuit diagram for temperature control and fixed heating. The method for reducing harmonic generation and current impact of electric heating resistive load includes the following steps:

[0034] S1. Connect the secondary side of the circuit breaker QF to the input end of the main circuit of the power adjustment element, then the output end of the main circuit of the power adjustment element passes through the AC current transformer TA, and connects to the input of the main contact of the AC contactor KM terminal, the secondary signal of the AC current transformer TA is connected to the AC ammeter PA, and the output terminal of the main contact of the AC contactor KM is connected to one end of the thermocouple;

[0035] S2. Connect ...

no. 2 example

[0049] Please refer to Figure 3-7 , based on the method for reducing harmonic generation and current impact of electric heating resistive loads provided in the first embodiment of the application, the second embodiment of the application proposes another method for reducing harmonic generation and current impact of electric heating resistive loads method. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0050] Specifically, the difference in the method for reducing harmonic generation and current impact of electric heating resistive loads provided by the second embodiment of the present application is that: the temperature controller used in S2 includes a casing 1, and the casing 1 The back of the housing 1 is provided with an inlet 2, the inlet 2 is provided with a connector 3, and both sides of the back of the shell 1 are fixedly ...

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Abstract

The invention provides a method for reducing harmonic generation and current impact of electric heating resistive load. The method for reducing harmonic generation and current impact of electric heating resistive loads includes the following steps: S1, connecting the secondary side of the molded case circuit breaker QF to the input end of the main circuit of the power adjustment element, and then the main circuit of the power adjustment element The output terminal of the AC current transformer TA passes through the AC current transformer TA and is connected to the input terminal of the main contact of the AC contactor KM, the secondary signal of the AC current transformer TA is connected to the AC ammeter PA, and the output terminal of the main contact of the AC contactor KM is connected to the thermoelectric Connect at one end. The method provided by the present invention to reduce the harmonic generation and current impact of the electric heating resistive load realizes the control of the output power of the heating element, and directly heats through the power supply system by using the fixed heating heating element R1, reducing the power adjustment element The control of the output power of the heating element by the SCR also reduces the current impact of the power adjustment element SSR on the heating circuit.

Description

technical field [0001] The invention relates to the field of electric heating control of industrial furnaces, in particular to a method for reducing harmonic generation and current impact of electric heating resistive loads. Background technique [0002] Among the electrical loads of industrial furnaces, resistive and inductive loads occupy a large proportion. Asynchronous motors, transformers, rectifiers, and power regulators are typical resistive and inductive loads. Resistive and inductive loads must absorb reactive power to work normally. It is determined by its own characteristics. [0003] In the roller furnace heating control system, according to the different triggering methods of power output, the electric heating method is divided into two types: one is the voltage regulation control method mainly using the power regulator SCR, which uses the principle of the AC-AC converter to convert The thyristor switching device is connected in series between the AC power supp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M1/32H02M1/42H05K7/20
CPCH02M1/14H02M1/32H02M1/4216H05K7/20918Y02B70/10
Inventor 徐金龙郎茂坤汪涛董邦林
Owner HENGLI ELETEK