CN106786643B - Fault current active control type current limiting system and its control method - Google Patents

Fault current active control type current limiting system and its control method Download PDF

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CN106786643B
CN106786643B CN201611170321.1A CN201611170321A CN106786643B CN 106786643 B CN106786643 B CN 106786643B CN 201611170321 A CN201611170321 A CN 201611170321A CN 106786643 B CN106786643 B CN 106786643B
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current
voltage
link
phase
controllable tube
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CN106786643A (en
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涂春鸣
郭祺
帅智康
姜飞
熊卓
何西
杨洁
孙勇
张丽
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Hunan University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Control Of Electrical Variables (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses fault current active control type current limiting system and its control methods, by DVR module of connecting, direct current DC-link link and parallel converters composition.Series side is made of 3 phase structure, and every phase includes L, C1It filters link, series transformer T, DVR module and direct current and connects DC-link link, it includes current-limiting inductance L that direct current, which connects DC-link link,1, discharge resistance rfAnd D5With bidirectional thyristor T3, LC filter filters out harmonic wave, by adjusting controllable tube T2Duty ratio controls bleeder resistance making time, makes current limit under a certain particular value.Electric capacity of voltage regulation C is attempted by between three single-phase series sides and PWM parallel converters, and PWM parallel converters are made of three phase full bridge.It can be achieved to improve network system quality of voltage, administer harmonic current, short trouble current-limiting function, improve electrical safety.

Description

Fault current active control type current limiting system and its control method
Technical field
The invention belongs to technical field of electric power, are related to a kind of fault current active tune based on Unified Power Quality Controller Control type current limiting system and its control method.
Background technique
With the development of Chinese national economy, power system load is increased rapidly, leads to grid short circuit power and short circuit Capacity constantly increases, and short-circuit current has very big harmfulness to the safe and stable operation of electric system；Non-linear device It is widely used in industry with impact load, power network current, voltage waveform is caused to be distorted, and the use of power quality sensitivity Electric equipment increases sharply, and requirement of the people to power quality is further harsh.Therefore, limiting short-circuit current promotes electric system Property safe and reliable to operation provides high quality electric energy to load, becomes China's safe and stable operation of power system and power train construction in a systematic way If, development must solve the problems, such as.
More current limiting technique scheme is applied at present, mainly passes through the current-limiting reactor on bus.However bus is connected Reactance can only realize failure current limit function, and reactor is serially connected in power grid for a long time, waste grid power, and current-limiting reactor is joined Number cannot be too big, leads to the not sufficiently effective of current limliting；Or it is also more for the research of bridge-type current limiter, but device reusability It is low, higher cost, and general current limiting technique scheme cannot improve power quality.
Summary of the invention
To achieve the above object, the present invention provides a kind of fault current active control type current limiting system and its control method, It not only can compensate for grid current harmonic and load be idle, can solve voltage swell, temporarily the electric energy matter such as drop and three-phase imbalance problem Amount problem, and be able to achieve grid short circuit current-limiting function can carry out active control to the limited amplitude of fault current, realize with after The cooperation of electric protection setting valve.
The technical scheme adopted by the invention is that fault current active control type current limiting system, using 3 phase structure, three Single-phase series part simultaneously on the left of electric capacity of voltage regulation C, connects PWM parallel converters on the right side of electric capacity of voltage regulation C, by electric capacity of voltage regulation C by three Phase structure is connected with PWM parallel converters；Wherein, every phase of three single-phase series parts is by series transformer T, inductance L With capacitor C1LC filtering, DVR module and the direct current connection DC-link link composition of composition.
Further, the DVR module includes 4 IGBT modules, electric capacity of voltage regulation and controllable tube Sa1、Sa2、Sa3、Sa4, pass through Series transformer accesses power grid.
Further, the PWM parallel converters are made of three-phase full-controlled bridge, through output inductor L2It is grid-connected.
Further, the DC-link link is by controllable tube T1、T3, current-limiting inductance L1And the energy consumption resistor r connectf, switch Pipe T2It can diode D with unloading5It forms, wherein controllable tube T1, current-limiting inductance L1And the energy consumption resistor r connectfWith switch transistor T2Concatenation, Current-limiting inductance L1And energy consumption resistor rfIt is connected to diode D5, T3Connect electric capacity of voltage regulation C and DVR module.
Another technical solution of the present invention is the control method of fault current active control type current limiting system, tool Body follows the steps below:
Step 1, power network current I is detectedSWith network voltage US, when not breaking down, switch transistor T1It disconnects, controls DVR module Four controllable tube Sa1、Sa2、Sa3、Sa4, mentioned system is equal to traditional UPQC, realizes that dynamic voltage compensation and harmonic wave are idle Electric current is administered；
Step 2, load current I is detecteda, the difference of DC capacitor voltage setting value and actual value is calculated, difference passes through PI It controls to adjust, obtains the parameter i of active current calculatingup, iupIt is synchronous that dq0-abc is carried out after being added with fundamental active component Transformation, obtains IaActive component size Iaf；
Step 3, computational load electric current IaWith IafDifference IΔ, obtain PWM parallel converters output electric current IbWith IΔIt is inclined Difference, deviation obtain the switching signal of PWM parallel converters after PI is controlled to adjust, realize power network current Is harmonic wave control and idle benefit It repays；
Step 4, network voltage U is detectedSIt temporarily rises, temporarily drop, three-phase imbalance problem, four of control DVR module are controllable Pipe Sa1、Sa2、Sa3、Sa4Realize dynamic voltage compensation；
Step 5, load voltage U is detectedLWith series transformer primary side voltage UT1, calculate network voltage and load voltage Difference UΔ, difference UΔWith series transformer primary side voltage UT1Deviation controlled to adjust through PI, regulated value compares through fixed-frequency hysteresis Device obtains controllable tube Sa1、Sa2、Sa3、Sa4Switching signal, to realize load voltage to the real-time tracking of network voltage；
Step 6, power network current I is detectedS, judge short circuit malfunction situation, when short circuit current is more than action value, controllably Pipe Sa1、Sa2、Sa3、Sa4Shutdown；Control T3It disconnects, T is connected1, series transformer secondary side voltage is through uncontrollable rectifier bridge D1-D4It flows through DC-link link discharges branch, and current-limiting inductance is in turn coupled to primary side route with limiting short-circuit current and its climbing；
Step 7, after detection ground fault occurs, pass through controllable tube T2Conducting and shutdown, i.e., control energy consumption resistor rf；
Step 8, after short trouble is eliminated, T is controlled3Conducting, T1Shutdown, current-limiting inductance L1It can diode D by unloading5Energy is unloaded, Line current restores normal operating condition, and mentioned system is equal to traditional UPQC.
Beneficial effects of the present invention: the short circuit current under system different type short trouble, protection electricity can be inhibited rapidly The equipment of Force system and customer charge；DVR system can compensate for voltage lifting, fall and imbalance of three-phase voltage, improve power train System power supply reliability, stability, improve the supply voltage quality of user side.It is exited using the controllable tube of UPQC after ground fault, And then form bridge-type current limiter and overcurrent is inhibited, system and device utilization rate is improved, after detecting ground fault, control is discharged Resistance conducting dutycycle can equivalent adjusting current-limiting impedance size, thus the size of accurate adjusting circuit electric current.And DC bus capacitor No overvoltage impact.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is a kind of fault current active control type current limliting system based on Unified Power Quality Controller of the embodiment of the present invention The topological diagram of system and its control method.
Fig. 2 is a kind of fault current active control type current limliting system based on Unified Power Quality Controller of the embodiment of the present invention The schematic diagram of system and its control method, wherein Fig. 2 a is normal mode equivalent circuit diagram；Fig. 2 b is failure current limit mode equivalent electricity Lu Tu.Module and the branch that need to be disconnected are indicated in figure with grey parts.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
A kind of fault current active control type current limiting system based on Unified Power Quality Controller, structure as shown in Figure 1, Using 3 phase structure, three single-phase series parts and on the left of electric capacity of voltage regulation C, PWM parallel connection unsteady flow is connected on the right side of electric capacity of voltage regulation C Device；Wherein, every phase of three single-phase series parts filters link (inductance L and capacitor C by series transformer T, LC1), DVR module with And direct current connection DC-link link composition；DVR module includes that 4 IGBT modules (include D inside IGBT module1-D4), pressure stabilizing electricity Hold and controllable tube Sa1、Sa2、Sa3、Sa4, power grid is accessed by series transformer；By electric capacity of voltage regulation C by 3 phase structure and PWM simultaneously Connection current transformer connects, and PWM parallel converters are made of three-phase full-controlled bridge, through output inductor L2It is grid-connected.
Further, 3 phase structure are as follows: series transformer primary side gets access to grid, secondary side shunt capacitance C1Concatenation electricity afterwards Sense L filters out higher hamonic wave as filter, the parallel connection DC-link link after DVR module.
Three single-phase DC DC-link links are summarized in electric capacity of voltage regulation, and three single-phase DC DC-link links are in parallel with PWM to be become It flows device and shares electric capacity of voltage regulation.
DC-link link is by controllable tube T1、T3, current-limiting inductance L1And the energy consumption resistor r connectf, switch transistor T2It can two poles with unloading Pipe D5It forms, wherein controllable tube T1, current-limiting inductance L1And the energy consumption resistor r connectfWith switch transistor T2Concatenation, current-limiting inductance L1And consumption It can resistance rfIt is connected to diode D5.Switch transistor T3Connect electric capacity of voltage regulation C and DVR module.
Under power grid nominal situation, controllable tube T is controlled1Shutdown, T3Conducting.DC-link link disconnects at this time, series side work In DVR mode, in APF mode, whole device is equivalent to traditional UPQC mode for side work in parallel.
When short trouble occurs, DC-link link participates in carrying out current limliting, controls controllable tube T1Conducting, T3Shutdown, passes through tune Save controllable tube T2Conducting dutycycle can equivalent adjusting current-limiting impedance size turn off series side to precisely limit short-circuit current value IGBT module, series side work is in bridge-type current limiter mode, and side work in parallel is in APF mode.
A kind of control method of the fault current active control type current limiting system based on Unified Power Quality Controller, specifically It follows the steps below:
Step 1, power network current I is detectedSWith network voltage US, when not breaking down, switch transistor T1It disconnects, controls DVR module Four controllable tube Sa1、Sa2、Sa3、Sa4, mentioned system is equal to traditional UPQC, realizes that dynamic voltage compensation and harmonic wave are idle Electric current is administered；
Step 2, load current I is detecteda, the difference of DC capacitor voltage setting value and actual value is calculated, difference passes through PI It controls to adjust, obtains the parameter i of active current calculatingup, iupIt is synchronous that dq0-abc is carried out after being added with fundamental active component Transformation, obtains IaActive component size Iaf；
Step 3, computational load electric current IaWith IafDifference IΔ, obtain PWM parallel converters output electric current IbWith IΔIt is inclined Difference, deviation obtain the switching signal of PWM parallel converters after PI is controlled to adjust, realize power network current Is harmonic wave control and idle benefit It repays；
Step 4, network voltage U is detectedSIt temporarily rises, temporarily drop, three-phase imbalance problem, four of control DVR module are controllable Pipe Sa1、Sa2、Sa3、Sa4Realize dynamic voltage compensation；
Step 5, load voltage U is detectedLWith series transformer primary side voltage UT1, calculate network voltage and load voltage Difference UΔ, difference UΔWith series transformer primary side voltage UT1Deviation controlled to adjust through PI, regulated value compares through fixed-frequency hysteresis Device obtains controllable tube Sa1、Sa2、Sa3、Sa4Switching signal, to realize load voltage to the real-time tracking of network voltage；
Step 6, power network current I is detectedS, judge short circuit malfunction situation, when short circuit current is more than action value, controllably Pipe Sa1、Sa2、Sa3、Sa4Shutdown.Control switch pipe T3It disconnects, controllable tube T is connected1, series transformer secondary side voltage is not controlled whole Flow bridge D1-D4Flow through the branch that discharges of DC-link link, current-limiting inductance be in turn coupled to primary side route with limiting short-circuit current and Its climbing；
Step 7, after detection ground fault occurs, pass through controllable tube T2Conducting and shutdown, i.e., control energy consumption resistor rf( The difference of investment circuit time, on the one hand can avoid energy consumption resistor r in power frequency periodfConstant conduction bring overheat, on the one hand Adjustable DC-link link and the size of line current, it can be achieved that the active of line fault size of current is adjusted, and DC side without The impact of overvoltage；
Step 8, after short trouble is eliminated, control switch pipe T3Conducting, T1Shutdown, current-limiting inductance L1It can diode by unloading D5Energy is unloaded, line current restores normal operating condition, and mentioned system is equal to traditional UPQC.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention It is interior.

Claims (1)

1. the control method of fault current active control type current limiting system, which is characterized in that use fault current active control type Current limiting system, the system use 3 phase structure, and three single-phase series parts simultaneously connect on the right side of the left side electric capacity of voltage regulation C, electric capacity of voltage regulation C PWM parallel converters are connect, are connected 3 phase structure and PWM parallel converters by electric capacity of voltage regulation C；Wherein, three single-phase string Join every phase of part by series transformer T, inductance L and capacitor C1LC filtering, DVR module and the direct current of composition connect DC- Link link composition；
The DVR module includes 4 IGBT modules, respectively controllable tube Sa1、Sa2、Sa3、Sa4, electricity is accessed by series transformer Net；
Diode D1, D2, D3, D4 respectively with Sa1、Sa2、Sa3、Sa4Parallel connection, the two conducting direction are opposite；
The PWM parallel converters are made of three-phase full-controlled bridge, through output inductor L2It is grid-connected；
The DC-link link is by controllable tube T1, controllable tube T3, current-limiting inductance L1And the energy consumption resistor r connectf, switch transistor T2With unload It can diode D5It forms, wherein controllable tube T1, current-limiting inductance L1And the energy consumption resistor r connectfWith switch transistor T2Concatenation, current-limiting inductance L1And energy consumption resistor rfIt is connected to diode D5, controllable tube T3Connect electric capacity of voltage regulation C and DVR module；
Then it specifically follows the steps below:
Step 1, power network current I is detectedSWith network voltage US, when not breaking down, controllable tube T1It disconnects, the four of control DVR module A controllable tube Sa1、Sa2、Sa3、Sa4, the system is equal to traditional UPQC, realizes dynamic voltage compensation and harmonic wave reactive current It administers；
Step 2, load current I is detecteda, the difference of DC capacitor voltage setting value and actual value is calculated, difference is adjusted by PI control Section obtains the parameter i of active current calculatingup, iupProgress dq0-abc is synchronous after being added with fundamental active component converts, and obtains To load current IaActive component size Iaf；
Step 3, computational load electric current IaWith IafDifference IΔ, obtain PWM parallel converters output electric current IbWith IΔDeviation, partially Difference obtains the switching signal of PWM parallel converters after PI is controlled to adjust, and realizes power network current Is harmonic wave control and reactive compensation；
Step 4, network voltage U is detectedSIt temporarily rises, temporarily drop, three-phase imbalance problem, control four controllable tube S of DVR modulea1、 Sa2、Sa3、Sa4Realize dynamic voltage compensation；
Step 5, load voltage U is detectedLWith series transformer primary side voltage UT1, calculate the difference of network voltage and load voltage UΔ, difference UΔWith series transformer primary side voltage UT1Deviation controlled to adjust through PI, regulated value is obtained through fixed-frequency hysteresis comparator To controllable tube Sa1、Sa2、Sa3、Sa4Switching signal, to realize load voltage to the real-time tracking of network voltage；
Step 6, power network current I is detectedS, judge short circuit malfunction situation, when short circuit current is more than action value, controllable tube Sa1、Sa2、Sa3、Sa4Shutdown；Control controllable tube T3It disconnects, controllable tube T is connected1, series transformer secondary side voltage is through uncontrollable rectifier Bridge D1-D4Flow through the branch that discharges of DC-link link, current-limiting inductance be in turn coupled to primary side route with limiting short-circuit current and its Climbing；
Step 7, after detection ground fault occurs, pass through switch transistor T2Conducting and shutdown, i.e., control energy consumption resistor rf；
Step 8, after short trouble is eliminated, T is controlled3Conducting, T1Shutdown, current-limiting inductance L1It can diode D by unloading5Unload energy, route Electric current restores normal operating condition, and the system is equal to traditional UPQC.
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CN108039707A (en) * 2017-12-20 2018-05-15 福州大学 Electric energy regulator and method based on dq0 converter techniques, SVPWM and Hysteresis control
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WO2020000528A1 (en) * 2018-06-25 2020-01-02 全球能源互联网研究院有限公司 Ring network controller and power distribution network
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