CN110989748A - Three-phase alternating-current voltage amplitude control method - Google Patents

Three-phase alternating-current voltage amplitude control method Download PDF

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Publication number
CN110989748A
CN110989748A CN201911366148.6A CN201911366148A CN110989748A CN 110989748 A CN110989748 A CN 110989748A CN 201911366148 A CN201911366148 A CN 201911366148A CN 110989748 A CN110989748 A CN 110989748A
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CN
China
Prior art keywords
voltage
current
load
inverter
load impedance
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911366148.6A
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Chinese (zh)
Inventor
任晓峰
王晓坤
尚磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Qianneng Electric Co Ltd
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Suzhou Qianneng Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CN201911366148.6A priority Critical patent/CN110989748A/en
Publication of CN110989748A publication Critical patent/CN110989748A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Inverter Devices (AREA)

Abstract

The invention belongs to the field of power control, and particularly relates to a three-phase alternating voltage amplitude control method which comprises the steps of quick voltage fluctuation response of a variable-frequency stabilized power supply, voltage control of an inverter voltage source, quick load switching control of the inverter voltage source, load parameter identification of the inverter voltage source and current feedback control. The invention calculates the new load size after the load impedance changes by identifying the load impedance, thereby accurately calculating the feedforward current, having high precision and low cost, and realizing the rapid voltage stabilization function by identifying parameters through a software algorithm.

Description

Three-phase alternating-current voltage amplitude control method
Technical Field
The invention belongs to the field of power supply control, and particularly relates to a three-phase alternating-current voltage amplitude control method.
Background
The three-phase alternating current voltage source is widely applied to products such as a voltage-stabilized power supply UPS, a marine shore power variable frequency power supply and the like. As a constant voltage power supply, it is one of the most important indicators that the amplitude of the voltage remains stable.
A simple voltage source is voltage open loop control. The voltage precision requirement is high, and a voltage closed loop is generally used. In the classical dual-loop control (as shown in fig. 3), in order to accelerate the PI control regulation speed, the control inner loop adopts current feedback control on the basis of a voltage closed loop.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the invention provides the three-phase alternating current voltage amplitude control method which can accurately calculate the feedforward current by identifying the load impedance and calculating the new load size after the load impedance changes, has high precision and low cost, and realizes the rapid voltage stabilization function by identifying parameters through a software algorithm.
The technical scheme of the invention is as follows: a three-phase alternating voltage amplitude control method comprises the steps of quick voltage fluctuation response of a variable-frequency stabilized voltage supply, voltage control of an inverter voltage source, quick load switching control of the inverter voltage source, load parameter identification of the inverter voltage source and current feedback control.
Preferably, the voltage control mode calculates the new load size after the load impedance changes by identifying the load impedance, thereby accurately calculating the feedforward current, and realizing the rapid voltage stabilization function by identifying parameters through a software algorithm.
Preferably, the voltage control method comprises the following specific steps:
(1) detecting an inverter output voltage, detecting an inverter output current, and measuring a load impedance according to a formula Z ═ Vload/IL;
(2) calculating the current Ifw needing to be output as 380V/(Vload/IL) according to the load impedance;
(3) feeding current forward to a given of the current loop;
(4) small voltage fluctuations are finally regulated by the voltage loop.
The invention calculates the new load size after the load impedance changes by identifying the load impedance, thereby accurately calculating the feedforward current, having high precision and low cost, and realizing the rapid voltage stabilization function by identifying parameters through a software algorithm.
Drawings
FIG. 1 is an electrical schematic diagram of an inverter system for a three-phase voltage source;
FIG. 2 is a voltage amplitude control schematic;
FIG. 3 is a conventional PI voltage and current control schematic;
FIG. 4 is a comparison of waveforms for sudden load increase according to the present invention;
FIG. 5 is a comparison of waveforms for sudden load shedding according to the present invention;
fig. 6 and 7 are graphs comparing waveforms during the load of the present invention from 0 to 100kW to 0.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, but the present invention is not limited thereto.
As shown in fig. 1 and 2, a three-phase ac voltage amplitude control method includes a voltage fluctuation fast response of a variable frequency stabilized voltage supply, a voltage control of an inverter voltage source, a load switching fast control of the inverter voltage source, and a load parameter identification and a current feedback control of the inverter voltage source. The voltage control mode calculates the new load size after the load impedance changes by identifying the load impedance, thereby accurately calculating the feedforward current, and realizing the rapid voltage stabilization function by identifying parameters through a software algorithm.
The voltage control mode comprises the following specific steps: (1) detecting an inverter output voltage, detecting an inverter output current, and measuring a load impedance according to a formula Z ═ Vload/IL; (2) calculating the current Ifw needing to be output as 380V/(Vload/IL) according to the load impedance; (3) feeding current forward to a given of the current loop; (4) small voltage fluctuations are finally regulated by the voltage loop.
The invention is characterized in that:
(1) estimating the load and predicting the required current according to the calculation;
(2) the current is fed forward to the current PI link,
comparison of actual waveforms:
① when the load is suddenly increased, the voltage and current waveforms change (as shown in FIG. 4, upper: voltage, lower: current)
② when suddenly load is removed, the voltage and current waveforms change (as shown in FIG. 5, upper: voltage, lower: current)
③ load from 0 to 100kW to 0, adding the waveform comparison before and after the invention;
a) the waveform before the invention is used has large voltage fluctuation and longer voltage stabilization time (as shown in figure 6):
b) after the invention is added, the waveform fluctuation of the voltage is obviously reduced, and the voltage stabilization time is shorter (as shown in figure 7);
the invention calculates the new load size after the load impedance changes by identifying the load impedance, thereby accurately calculating the feedforward current, having high precision and low cost, and realizing the rapid voltage stabilization function by identifying parameters through a software algorithm.

Claims (3)

1. A three-phase alternating voltage amplitude control method is characterized in that: the method comprises the steps of quick voltage fluctuation response of a variable-frequency stabilized voltage supply, voltage control of an inverter voltage source, quick load switching control of the inverter voltage source, load parameter identification of the inverter voltage source and current feedback control.
2. A three-phase ac voltage amplitude control method according to claim 1, characterized in that: the method calculates the new load size after the load impedance changes by identifying the load impedance, thereby accurately calculating the feedforward current, and realizes the rapid voltage stabilization function by identifying parameters through a software algorithm.
3. A three-phase ac voltage amplitude control method according to claim 1, characterized in that: the method comprises the following specific steps:
(1) detecting an inverter output voltage, detecting an inverter output current, and measuring a load impedance according to a formula Z ═ Vload/IL;
(2) calculating the current Ifw needing to be output as 380V/(Vload/IL) according to the load impedance;
(3) feeding current forward to a given of the current loop;
(4) small voltage fluctuations are finally regulated by the voltage loop.
CN201911366148.6A 2019-12-26 2019-12-26 Three-phase alternating-current voltage amplitude control method Pending CN110989748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911366148.6A CN110989748A (en) 2019-12-26 2019-12-26 Three-phase alternating-current voltage amplitude control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911366148.6A CN110989748A (en) 2019-12-26 2019-12-26 Three-phase alternating-current voltage amplitude control method

Publications (1)

Publication Number Publication Date
CN110989748A true CN110989748A (en) 2020-04-10

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Country Status (1)

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CN (1) CN110989748A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102829912A (en) * 2012-08-30 2012-12-19 清华大学 DC power measurement loading system
CN202856358U (en) * 2012-08-26 2013-04-03 厦门埃锐圣电力科技有限公司 Double closed loop dynamic voltage regulator
CN103490420A (en) * 2013-10-14 2014-01-01 上海电力学院 Grid-connected control method of micro-grid based on auto-disturbance-rejection technique
CN105703450A (en) * 2016-04-15 2016-06-22 中国计量大学 Low-frequency PWM rectifier and compensation capacitor based wireless charging apparatus
CN105811421A (en) * 2016-03-17 2016-07-27 上海电力学院 Improved droop control based microgrid auxiliary master-slave control method
JP2017158385A (en) * 2016-03-04 2017-09-07 富士電機株式会社 Voltage compensation device and method for linking inverter in voltage compensation device
CN109962638A (en) * 2017-12-14 2019-07-02 欧姆龙株式会社 Power inverter
CN110048514A (en) * 2019-02-22 2019-07-23 苏州加士革电子科技有限公司 Wireless power transmission system based on primary side feedback controller

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202856358U (en) * 2012-08-26 2013-04-03 厦门埃锐圣电力科技有限公司 Double closed loop dynamic voltage regulator
CN102829912A (en) * 2012-08-30 2012-12-19 清华大学 DC power measurement loading system
CN103490420A (en) * 2013-10-14 2014-01-01 上海电力学院 Grid-connected control method of micro-grid based on auto-disturbance-rejection technique
JP2017158385A (en) * 2016-03-04 2017-09-07 富士電機株式会社 Voltage compensation device and method for linking inverter in voltage compensation device
CN105811421A (en) * 2016-03-17 2016-07-27 上海电力学院 Improved droop control based microgrid auxiliary master-slave control method
CN105703450A (en) * 2016-04-15 2016-06-22 中国计量大学 Low-frequency PWM rectifier and compensation capacitor based wireless charging apparatus
CN109962638A (en) * 2017-12-14 2019-07-02 欧姆龙株式会社 Power inverter
CN110048514A (en) * 2019-02-22 2019-07-23 苏州加士革电子科技有限公司 Wireless power transmission system based on primary side feedback controller

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Application publication date: 20200410

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