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Electricity-saving control method and device of frequency converter

A technology of power-saving control and frequency converter, which is applied in the direction of electric controller, low-speed motor control, AC motor control, etc., can solve the problems of reducing motor life, power system interference, and not considering the working state of the motor, so as to reduce the interference of the power grid , solve the system lag, improve the effect of power utilization

Inactive Publication Date: 2010-02-17
乐普四方(北京)节能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the relationship between the motor, load and frequency converter is not considered, as well as the impact of the three on the power supply system, the operation of the power supply-power consumption system such as frequency conversion speed regulation is not stable enough, and it is prone to failure.
Because the relationship between the motor, load and frequency converter is not considered, the motor often works at a low efficiency state, causing the controlled motor to generate heat due to low efficiency operation, causing unnecessary waste and reducing the life of the motor
Because the relationship between the motor, load and frequency converter is not considered, the load of the frequency converter and its motor often work in a low-efficiency state, and the uncoordinated work among the three will make the operation of the frequency converter and the motor A large number of harmonics are caused, and at the same time, the stepwise change of the frequency of the frequency converter will also generate a large number of harmonics
The interference of these harmonics to the power system is very serious, and its harmonic content can reach 30%-70%. Such serious interference is very unfavorable to the power grid
Because the traditional frequency conversion speed regulator only considers the speed regulation problem, and does not consider the working state of the motor, the motor-load operation system often lags behind, resulting in a low power factor of the system, a decrease in power supply efficiency, and serious waste of electric energy

Method used

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  • Electricity-saving control method and device of frequency converter

Examples

Experimental program
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Embodiment 1

[0020] This embodiment is a power-saving control method for frequency converters. The hardware system used is such as figure 1 As shown, including: inverter power-saving control device with CPU and storage elements. For the procedure of the method, see figure 2 As shown, the steps include:

[0021] The step of accepting the instruction of variable speed and frequency modulation, this instruction can be sent by a person or by a certain sensor of the automation system. For example, in the refrigeration and air-conditioning system, it can be a temperature set manually, and this temperature is different from the existing room temperature, so it is necessary to change the temperature, increase or decrease the speed of the motor, so as to realize the change of cooling capacity. It may also be that when the temperature sensor in the room reaches a certain set temperature threshold, the rotation speed of the motor needs to be increased or decreased to maintain the temperature in th...

Embodiment 2

[0029] This embodiment is an optimization solution of Embodiment 1, and is an optimization of the information source in the step of collecting information described in Embodiment 1. The information originally includes the frequency converter and the calculus proportional controller PID.

[0030]The frequency converter itself can obtain some parameters of the motor and load through some of the sensors, for example, by measuring the voltage and current changes of the motor, it can indirectly measure the load driven by the motor, and also measure the voltage and current of the motor The working state of the motor can also be measured. In short, the frequency converter itself is an electrical system through which many motor-load parameters can be obtained.

[0031] Calculus proportional controller PID is a widely used controller, which is used in almost all industrial control systems. Usually, a given value is set and compared with the original value, the control direction can b...

Embodiment 3

[0033] This embodiment is an optimization solution of Embodiment 1, and is an optimization of the information source in the step of collecting information described in Embodiment 1. The information sources in the step of collecting information include external sensors that directly obtain parameters without going through the frequency converter.

[0034] Said external sensors are sensors that directly measure current, voltage, flow, speed, and the like. The setting of these sensors mainly depends on what system the final output of the power system is. For example, in an air-conditioning system, the sensor can be a sensor that directly measures the indoor temperature, or a sensor that measures the current and voltage of the refrigeration motor, or a sensor that measures the flow or velocity of the refrigerant. In short, it is a sensor that directly measures relevant system parameters. The setting of external sensors makes the whole motor, frequency converter and load system a...

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Abstract

The invention discloses a power saving control method for a frequency converter and the device, which optimizes the control of the speed regulating frequency converter of motor and realizes power saving. The method comprises the following steps: accepting the instruction of speed changing and frequency modulating; collecting information; extracting property parameter; comparing; analyzing runningcycle; realizing the process of frequency modulating. The invention has the advantages of enabling the system formed with the whole motor, the frequency conversion governor and the load under the best status and improving work efficiency of the system due to storing a large quantity of work data of the whole motor, the frequency conversion governor and the load and using fuzzy algorithm to optimize the work status of the system formed with the whole motor, the frequency conversion governor and the load, effectively solving the problem of unstable system, obviously improving work efficiency for the motor, obviously lowering heat production, saving power by 10 to 30%, obviously lowering harmonic quantity, lowering interruption upon power network and reaching more than 0.95 for power factordue to adopting smooth frequency variation curve.

Description

technical field [0001] The invention relates to a power-saving control method and device for a frequency converter, which is a control method and device for a motor speed-regulating frequency converter, and a method and device for optimizing control of a motor speed-regulating frequency converter and realizing power saving. Background technique [0002] The use of frequency conversion speed regulation for power saving has been widely accepted as an effective power saving method. The reason is that the high-power frequency conversion speed controller for power is a mature product, and its price is so low that almost all power supply equipment can accept it. Its power-saving effect is very obvious. However, the traditional variable frequency speed controller simply adjusts the motor speed to the set speed, that is, it does not take into account the relationship between the motor, load and frequency converter, and does not consider the impact of the fast frequency conversion pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/04H02P23/00H02P23/03H02M1/00G05B15/02G05B11/42H04L29/06
Inventor 毛文剑
Owner 乐普四方(北京)节能技术有限公司
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