CN110932315A - Phase selection control method of quick switch - Google Patents

Phase selection control method of quick switch Download PDF

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Publication number
CN110932315A
CN110932315A CN201911153882.4A CN201911153882A CN110932315A CN 110932315 A CN110932315 A CN 110932315A CN 201911153882 A CN201911153882 A CN 201911153882A CN 110932315 A CN110932315 A CN 110932315A
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CN
China
Prior art keywords
phase
voltage
real
split
angle theta
Prior art date
Application number
CN201911153882.4A
Other languages
Chinese (zh)
Inventor
王永超
许洪华
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北京科诺伟业科技股份有限公司
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Priority to CN201911153882.4A priority Critical patent/CN110932315A/en
Publication of CN110932315A publication Critical patent/CN110932315A/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225Demand response systems, e.g. load shedding, peak shaving
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems
    • Y04S20/222Demand response systems, e.g. load shedding, peak shaving

Abstract

A phase selection control method for a fast switch. Considering the load characteristic of switching equipment, after the rapid switch control module receives a closing instruction, firstly, the real-time phase angle theta of the power grid voltage is judgedgWhether it is equal to the split-phase fixed peak-to-valley angle thetaref Andif the judgment condition is met, the split-phase driving signal Drive output by the control moduleA、DriveBOr DriveCAnd setting the voltage to be 1, driving the fast switch to be in split-phase closing, and realizing accurate switching.

Description

Phase selection control method of quick switch

Technical Field

The invention relates to a control method of a quick switch.

Background

The grid-connected micro-grid system is connected with a large power grid through power distribution switching equipment, has two operation modes of grid connection and grid disconnection, and needs to realize quick switching in order to ensure reliable power supply of important loads in the grid. Current research around fast switching control strategies is dominated by voltage fault detection and mode switching control strategies. Patent CN102983593A discloses a method for implementing mode switching control by using master-slave control strategy. Patent CN105429167A discloses a voltage fault determination method based on the combination of voltage instantaneous value and frequency determination.

When the fast switch body receives a switching command, the fast switch body acts, the load characteristics of switching equipment, such as transient overvoltage and inrush current of capacitive or inductive equipment at different switching phase angles, are not considered, and although fault shutdown cannot occur, the fast switch body has influences on the insulation and the service life of the equipment.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, comprehensively considers the load characteristics of switching equipment and provides a phase selection control method of a quick switch. According to the invention, the voltage angle of the power grid is detected in real time and compared with the angle of the fixed peak-valley value, then the phase splitting action of the fast switch is controlled, meanwhile, the influence of frequency fluctuation and waveform distortion on the switch action is avoided, and the accurate switching of the fast switch is realized.

The typical micro-grid system comprises an energy storage system, a load, a distributed power system, a power grid, power distribution switching equipment and the like. The power distribution switching equipment comprises an input breaker, a quick switch, an output breaker and a control module. One end of the fast switch is connected with a power grid through an input breaker, and the other end of the fast switch is respectively connected with the energy storage system, the load and the distributed power system through 3 output breakers. The input end of the control module is a voltage and current sampling value and a closing instruction, and the output end of the control module is a driving signal and state feedback of the quick switch.

The method for realizing the phase selection control of the quick switch comprises the following steps: after the control module receives the closing instruction, firstly, the real-time phase angle theta of the power grid voltage is judgedgWhether it is equal to the split-phase fixed peak-to-valley angle thetarefIf the real-time phase angle theta of the grid voltagegEqual to the angle theta of the fixed peak-valley value of the split phaserefThen the split-phase driving signal Drive output by the fast switch control moduleA、DriveBOr DriveCIs set to 1, and drives the fast switch to be closed in a split phase mannerAnd accurate switching is realized.

The real-time phase angle theta of the power grid voltagegAnd acquiring in real time by adopting a software phase-locked loop method. Firstly, Clark and Park conversion is carried out on a power grid voltage sampling value to obtain q-axis voltage uqQ-axis voltage uqThe real-time phase angle theta of the grid voltage is obtained by outputting the angular frequency through the PI regulator and integrating the angular frequencyg

The split-phase fixed peak-valley angle thetarefThe sine wave characteristic analysis shows that the three-phase voltage waveform has 6 peak-valley points in one period, and is a fixed value sequence, and the values are respectively when the A-phase voltage rotates directionally And

the split-phase driving signal is output according to a judgment condition, and the specific judgment method comprises the following steps:

1) when the real-time phase angle of the network voltageOrWhen the A-phase driving signal Drive is rapidly switchedA=1;

2) When the real-time phase angle of the network voltageOrWhen, the B phase driving signal Drive is rapidly switched on and offB=1;

3) When the real-time phase angle of the network voltageOrWhen, the C-phase driving signal Drive is rapidly switched on and offC=1;

The fast switch is composed of controllable power electronic devices, also called solid-state switches, such as thyristors of semi-control devices or IGBTs of full-control devices, and the like, typical action time is us-level and can be ignored, and action delay compensation is not required to be considered.

The invention adopts a phase selection control method for the fast switch, namely, the actions of the solid state switches of all phases are respectively controlled, so that the transient overvoltage or inrush current caused by different load characteristics is restrained, the stress of the device is reduced, the service life is prolonged, and the reliability of the system is improved.

Drawings

FIG. 1 is a diagram of a typical microgrid system topology;

FIG. 2 is a flow chart of a method of implementing phase selection control in accordance with the present invention;

FIG. 3 is a schematic diagram of the angle of the peak and valley values of the fixed phase separation.

Detailed Description

The invention is further described below with reference to the accompanying drawings and the detailed description.

As shown in fig. 1, a typical microgrid system is composed of an energy storage system, loads, a distributed power system, a power grid, power distribution switching equipment and the like. The fast switching device to which the present invention is applied includes: the breaker Q1, the fast switch QA, the breaker Q21, the breaker Q22, the breaker Q23 and the control module.

One end of the fast switch QA is connected with a power grid through a breaker Q1, and the other end of the fast switch QA is connected with a microgrid bus. And the other end of the microgrid bus is respectively connected with the energy storage system, the load and the distributed power supply system through a circuit breaker Q21, a circuit breaker Q22 and a circuit breaker Q23. The input end of the control module is a voltage and current sampling value and a closing instruction, and the output end of the control module is a driving signal and state feedback of the quick switch.

The invention is realized quicklyThe flow of the speed switch phase selection control method is shown in fig. 2. After the control module receives the closing instruction, firstly, the real-time phase angle theta of the power grid voltage is judgedgWhether it is equal to the split-phase fixed peak-to-valley angle thetarefIf the real-time phase angle theta of the grid voltagegEqual to the angle theta of the fixed peak-valley value of the split phaserefThen the split-phase driving signal Drive output by the fast switch control moduleA、DriveBOr DriveCAnd setting 1 to drive the quick switch to be in split-phase closing, so as to realize accurate switching.

The real-time phase angle theta of the power grid voltagegAnd acquiring in real time by adopting a software phase-locked loop method. Firstly, Clark and Park conversion is carried out on a power grid voltage sampling value to obtain dq axis voltage ud、uq,uqThe real-time phase angle theta of the grid voltage is obtained by outputting the angular frequency through the PI regulator and integrating the angular frequencyg

The split-phase fixed peak-valley angle thetarefThe sine wave characteristic analysis shows that the three-phase voltage waveform has 6 peak-valley points in one period, and is a fixed value sequence, and the values are respectively when the A-phase voltage rotates directionally Andas shown in fig. 3.

The split-phase driving signal is output according to a judgment condition, and the judgment method comprises the following steps:

1) when the real-time phase angle of the network voltageOrWhen the A-phase driving signal Drive is rapidly switchedA=1;

2) When the network voltage is real timePhase angleOrWhen, the B phase driving signal Drive is rapidly switched on and offB=1;

3) When the real-time phase angle of the network voltageOrWhen, the C-phase driving signal Drive is rapidly switched on and offC=1;

The fast switch is composed of controllable power electronic devices, also called solid-state switches, such as thyristors of semi-control devices or IGBTs of full-control devices, and the like, typical action time is us-level and can be ignored, and action delay compensation is not required to be considered.

Claims (5)

1. A phase selection control method of a fast switch is characterized in that: after the rapid switch control module receives a closing instruction, firstly, the real-time phase angle theta of the power grid voltage is judgedgWhether it is equal to the split-phase fixed peak-to-valley angle thetarefIf the real-time phase angle theta of the grid voltagegEqual to the angle theta of the fixed peak-valley value of the split phaserefThen the split-phase driving signal Drive output by the fast switch control moduleA、DriveBOr DriveCAnd setting the voltage to be 1, driving the fast switch to be in split-phase closing, and realizing switching.
2. The phase selection control method of the fast switch according to claim 1, characterized in that: acquiring the real-time phase angle theta of the power grid voltage in real time by adopting a software phase-locked loop methodg(ii) a Firstly, Clark and Park conversion is carried out on a power grid voltage sampling value to obtain q-axis voltage uqQ-axis voltage uqThe real-time phase angle theta of the grid voltage is obtained by outputting the angular frequency through the PI regulator and integrating the angular frequencyg
3. The phase selection control method of the fast switch according to claim 1, characterized in that: the split-phase fixed peak-valley angle thetarefThe sine wave characteristic analysis shows that the three-phase voltage waveform has 6 peak-valley value points in one period, and is a fixed value sequence, and the values of the three-phase voltage waveform in the directional rotation of the A-phase voltage are respectivelyAnd
4. the phase selection control method of the fast switch according to claim 1, characterized in that: the split-phase driving signal is output according to a judgment condition, and the specific judgment method comprises the following steps:
1) when the real-time phase angle of the network voltageOrWhen the A-phase driving signal Drive is rapidly switchedA=1;
2) When the real-time phase angle of the network voltageOrWhen, the B phase driving signal Drive is rapidly switched on and offB=1;
3) When the real-time phase angle of the network voltageOrWhen, the C-phase driving signal Drive is rapidly switched on and offC=1。
5. The phase selection control method of the fast switch according to claim 1, characterized in that: the fast switch is formed by controllable power electronic devices, typical action time is us-level and can be ignored, and action delay compensation is not required to be considered.
CN201911153882.4A 2019-11-22 2019-11-22 Phase selection control method of quick switch CN110932315A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN201911153882.4A CN110932315A (en) 2019-11-22 2019-11-22 Phase selection control method of quick switch

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CN110932315A true CN110932315A (en) 2020-03-27

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Publication number Priority date Publication date Assignee Title
CN101388551A (en) * 2008-07-17 2009-03-18 李俭华 Electricity quality intelligent monitoring and resonating device
CN102983593A (en) * 2012-12-25 2013-03-20 中国东方电气集团有限公司 Seamless handover control method for microgrid based on intelligent switch
CN103066621A (en) * 2012-12-25 2013-04-24 合肥工业大学 Static switch and control method applied to connection of microgrid and public supply network
CN104218612A (en) * 2014-09-26 2014-12-17 东南大学 Micro-grid flexible grid-connected control method based on integrated control on common connecting point position
CN105762829A (en) * 2014-12-16 2016-07-13 中国科学院沈阳自动化研究所 Microgrid inverter grid disconnection/connection seamless switching control method based on phase angle estimation
US20180145582A1 (en) * 2017-01-16 2018-05-24 Hunan University Virtual synchronous inverter with fast transient inrush fault currents restraining method thereof
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Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101388551A (en) * 2008-07-17 2009-03-18 李俭华 Electricity quality intelligent monitoring and resonating device
CN102983593A (en) * 2012-12-25 2013-03-20 中国东方电气集团有限公司 Seamless handover control method for microgrid based on intelligent switch
CN103066621A (en) * 2012-12-25 2013-04-24 合肥工业大学 Static switch and control method applied to connection of microgrid and public supply network
CN104218612A (en) * 2014-09-26 2014-12-17 东南大学 Micro-grid flexible grid-connected control method based on integrated control on common connecting point position
CN105762829A (en) * 2014-12-16 2016-07-13 中国科学院沈阳自动化研究所 Microgrid inverter grid disconnection/connection seamless switching control method based on phase angle estimation
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CN109638865A (en) * 2018-11-15 2019-04-16 北京科诺伟业科技股份有限公司 A kind of method that energy accumulation current converter inhibits excitation surge current

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