CN109638865A - A kind of method that energy accumulation current converter inhibits excitation surge current - Google Patents

A kind of method that energy accumulation current converter inhibits excitation surge current Download PDF

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Publication number
CN109638865A
CN109638865A CN201811360097.1A CN201811360097A CN109638865A CN 109638865 A CN109638865 A CN 109638865A CN 201811360097 A CN201811360097 A CN 201811360097A CN 109638865 A CN109638865 A CN 109638865A
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CN
China
Prior art keywords
angle
main contactor
phase angle
closure
phase
Prior art date
Application number
CN201811360097.1A
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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 CN201811360097.1A priority Critical patent/CN109638865A/en
Publication of CN109638865A publication Critical patent/CN109638865A/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
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic 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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

A kind of method that energy accumulation current converter inhibits excitation surge current.Energy accumulation current converter first determines whether closure phase angle θ in starting off-network mode process when receiving main contactor close commandcWhether it is equal toOrClosure phase angle θcBy inverter output voltage real-time phase angle θinvWith main contactor action delay offset angle θd, and last main contactor closing moment actual phase correction angle △ θ composition.If meet condition executes closed procedure again, realization is at the phase angle of inverter output voltageOrAt the time of put into transformer.The inhibition to transformer excitation flow is realized by the control to main contactor closure phase angle.

Description

A kind of method that energy accumulation current converter inhibits excitation surge current
Technical field
The present invention relates to a kind of methods that energy accumulation current converter inhibits excitation surge current.
Background technique
In micro-grid system, some energy-storage systems exchange side interface voltage class and points of common connection voltage class not Together, thus energy accumulation current converter exchange end voltage transformation need to be carried out via transformer after connect again with power grid, power load etc..Micro- Network system off-network independent operating initial stage, there are no-load transformer start operating performances, and there are biggish excitations to gush for no-load transformer starting Stream, maximum amplitude is up to more than ten times of transformer rated current, and the interface equipment of micro-grid system is mostly that power electronics becomes Exchange device, overload capacity is very low, easily initiation failure.
The resistance of remanent magnetism and system when the size and transformer of excitation surge current are put into the phase angle and iron core of system voltage The factors such as anti-are related, and die-away time depends on loop resistance and reactance.In conjunction with the mechanism of production of excitation surge current, common inhibition side Method, which has, increases current-limiting resistance and using phase-controlled device.Patent CN 203983974U discloses a kind of no-load transformer investment Magnetizing inrush current suppression device, by increasing current-limiting resistance in major loop, by current-limiting resistance realization to shoving when Transformer Close The limitation of amplitude again cuts off resistance after the completion of closing a floodgate.Patent CN 1700550A discloses a kind of power transformer excitation surge current Suppressing method and equipment, by increase phase-controlled device, record transformer frequency response excision when phase angle, control close a floodgate when Phase angle offsets bias and remanent magnetism, realizes the inhibition to excitation surge current.
The above method requires to add hardware device for micro-grid system, change existing system hardware configuration and Operating procedure, while also increasing system investment cost.
Summary of the invention
The purpose of the present invention is overcoming the prior art, propose that a kind of energy accumulation current converter inhibits the side of excitation surge current Method.The present invention realizes the inhibition to excitation surge current by the control to energy accumulation current converter inside main contactor closure phase angle, no Change the structure of original system.
It is made of using micro-grid system of the invention energy-storage system, transformer, load, photovoltaic system and power grid etc., Middle energy-storage system includes battery system and energy accumulation current converter.Energy accumulation current converter include DC side breaker, DC/AC translation circuit, LC filter, main contactor and exchange side breaker and inverter side voltage sample and alternating voltage sampling circuit.Energy storage becomes One end of stream device DC side breaker is connect with battery system, and the other end of DC side breaker is connect with DC/AC translation circuit, It is connect again via LC filter with main contactor, the both ends of LC filter are separately connected DC/AC translation circuit and main contactor.It is main The other end of contactor is connect with exchange side breaker, and the other end for exchanging side breaker is exported as the exchange of energy accumulation current converter Port is connect with transformer, and the other end and load and photovoltaic system of transformer are commonly connected to power grid bus.Inverter side electricity Pressure sampling and alternating voltage sampling circuit are connected to main contactor both ends, the voltage waveform letter of acquisition main contactor two sides Breath.
Energy accumulation current converter is alternating current by the DC power conversion that DC/AC translation circuit exports energy-storage battery, then via Stable three-phase alternating voltage is exported after LC filter filtering, and main contact is closed according to the instruction that micro-capacitance sensor management system issues Device makes energy accumulation current converter work in grid-connect mode or off-network mode.Energy accumulation current converter and load and photovoltaic system when grid-connect mode It is commonly connected to power grid, charge or discharge operation is carried out according to battery electric quantity state;Group is established by energy-storage system when off-network mode Net voltage is continued to run for load and photovoltaic system.
Energy accumulation current converter of the present invention inhibits the method and step of excitation surge current as follows: in starting off-network mode process, energy storage After current transformer receives main contactor close command, closure phase angle θ is first determined whethercWhether it is equal toOrIf being closed phase Parallactic angle θcIt is equal toOrJust closure main contactor operation is executed, is at the phase angle of inverter output voltageOrWhen Carve investment transformer.It is minimum that the bias that transformer generates is put under the angle, realizes the inhibition to shoving.
The closure phase angle θcBy inverter output voltage real-time phase angle θinvAngle is compensated with main contactor action delay Spend θd, and last main contactor closing moment actual phase correction angle delta θ composition.
To the inverter output voltage real-time phase angle θinvIt is detected using software phase-lock loop method.Energy storage is become first The obtained three-phase instantaneous value of stream device inverter side voltage sample carries out Clark and Park transformation, by alternating voltage from three phase static abc Coordinate system transformation makes q shaft voltage 0 under two-phase synchronous rotary dq coordinate system, then by closed-loop control, realizes locking phase, detects this When energy accumulation current converter inverter output voltage phase angle, this phase angle be the inverter output voltage real-time phase angle θinv
The main contactor action delay offset angle θdAccording to the intrinsic actuation time t of main contactordConversion, calculating side Method are as follows:
Wherein T is the period of inverter output voltage, T=20ms.
The intrinsic actuation time t of main contactordRefer to the time interval being closed completely since closed procedure to its main contact, Generally tens ms are obtained by product data handbook or actual measurement.
If not compensating the closed procedure for just executing main contactor, may prolong because of main contactor intrinsic actuation time When, cause practical closure phase angle deviateingOrAt the time of put into transformer, just cannot effectively inhibit excitation surge current.
To promote this closure phase angle θcAccuracy, the present invention is to closure phase angle θcDo angle compensation, offset angle For the correction angle delta θ of the actual phase of last main contactor closing moment, the initial value of Δ θ before main contactor is closed for the first time It is 0.
This closure phase angle θcCalculation method it is as follows:
Wherein remainder indicates complementation, inverter output voltage real-time phase angle θinvIt is compensated with main contactor action delay Angle, θdAnd the correction angle delta θ of the actual phase after main contactor last time closure is added divided by 2 π and takes the remainder and be denoted as closure Phase angle θc, meet this closure phase angle of conditionOr
Main contactor is in this closure phase angle θcClosed procedure is executed at the time of meeting condition.
Main contactor completes the practical closure phase angle θ that closure is the transformer investment momentc' use software phase-lock loop method Detection, is calculated by the alternating current sampling circuit of main contactor rear class, with inverter output voltage real-time phase angle θinvInspection Survey method is identical.
Correction angle delta θ=θ of actual phase after this closure of main contactorcc', it is closed as main contactor next time Preceding angle compensation value.
The present invention is only realized to static exciter by energy accumulation current converter on the basis of not increasing system hardware facility The inhibition shoved reduces the development cost of system, improves the reliability of system.
Detailed description of the invention
Fig. 1 is energy accumulation current converter and micro-grid system topological diagram;
Fig. 2 is the flow chart that the present invention inhibits excitation surge current method.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, using micro-grid system of the invention by energy-storage system, transformer, load, photovoltaic system and power grid Deng composition, wherein energy-storage system includes battery system and energy accumulation current converter.Energy accumulation current converter includes: DC side circuit breaker Q 1, DC/ AC translation circuit, LC filter, main contactor Q2 and exchange side circuit breaker Q 3.
One end of the DC side circuit breaker Q 1 is connect with battery system, the other end and DC/AC of dc circuit breaker Q1 Translation circuit connection, then connect via LC filter with main contactor Q2, the other end of main contactor Q2 with exchange side breaker The other end of Q3 connection, exchange side circuit breaker Q 3 is connect as the ac output end mouth of energy accumulation current converter with transformer T1, transformation The other end and load and photovoltaic system of device T1 is commonly connected to power grid bus.
Energy accumulation current converter is alternating current by the DC power conversion that DC/AC translation circuit exports energy-storage battery, then via Stable three-phase alternating voltage is exported after LC filter filtering, and main contact is closed according to the instruction that micro-capacitance sensor management system issues Device makes energy accumulation current converter work in grid-connect mode or off-network mode.Energy accumulation current converter and load and photovoltaic system when grid-connect mode It is commonly connected to power grid, charge or discharge operation is carried out according to battery electric quantity state;Group is established by energy-storage system when off-network mode Net voltage is continued to run for load and photovoltaic system.
Energy accumulation current converter of the present invention inhibits the process of the method for excitation surge current as shown in Figure 2.In starting off-network mode process In, when main contactor Q2 is in an off state, after energy accumulation current converter receives main contactor close command, first determine whether closure phase Parallactic angle θcWhether it is equal toOrIf closure phase angle θcIt is equal toOrJust closure main contactor operation is executed, inverse Become output voltage phase angle intoOrAt the time of put into transformer.It is minimum that the bias that transformer generates is put under the angle, Realize the inhibition to shoving.
The closure phase angle θcBy inverter output voltage real-time phase angle θinvAngle is compensated with main contactor action delay Spend θd, and last main contactor closing moment actual phase correction angle delta θ composition.
The inverter output voltage real-time phase angle θinvIt is detected using software phase-lock loop method, first to energy storage unsteady flow The three-phase instantaneous value that device inverter side voltage sample obtains carries out Clark and Park transformation, and alternating voltage is sat from three phase static abc Mark system is transformed under two-phase synchronous rotary dq coordinate system, then makes q shaft voltage 0 by closed-loop control, realizes locking phase, detection is at this time The phase angle of the inverter output voltage of energy accumulation current converter, this phase angle are the real-time phase angle θ of the inverter output voltageinv
The main contactor action delay offset angle θdAccording to the intrinsic actuation time t of main contactordConversion, calculating side Method are as follows:
Wherein T is the period of inverter output voltage, T=20ms.
The intrinsic actuation time t of main contactordRefer to the time interval being closed completely since closed procedure to its main contact, Generally tens ms are obtained by product data handbook or actual measurement.It, can if not compensating the closed procedure for just executing main contactor Practical closure phase angle can be caused to deviate because of the intrinsic actuation time delay of main contactorOrAt the time of put into transformation Device just cannot effectively inhibit excitation surge current.
To promote this closure phase angle θcAccuracy, the present invention is to closure phase angle θcDo angle compensation, offset angle For the correction angle delta θ of the actual phase of last main contactor closing moment, the initial value of Δ θ before main contactor is closed for the first time It is 0.
This closure phase angle θcCalculation method it is as follows:
Wherein remainder indicates complementation, inverter output voltage real-time phase angle θinvIt is compensated with main contactor action delay Angle, θdAnd the correction angle delta θ of the actual phase after main contactor last time closure is added divided by 2 π and takes the remainder and be denoted as closure Phase angle θc, meet this closure phase angle of conditionOr
Main contactor is in this closure phase angle θcClosed procedure is executed at the time of meeting condition.
Main contactor completes the practical closure phase angle θ that closure is the transformer investment momentc' use software phase-lock loop method Detection, is calculated by the alternating current sampling circuit of main contactor rear class, with inverter output voltage real-time phase above-mentioned angle θinvDetection method it is identical.
Correction angle delta θ=θ of actual phase after this closure of main contactorcc', it is closed as main contactor next time Preceding angle compensation value.

Claims (4)

1. a kind of method that energy accumulation current converter inhibits excitation surge current, it is characterised in that: the energy accumulation current converter is in starting off-network In mode process, after receiving main contactor close command, closure phase angle θ is first determined whethercWhether it is equal toOrIf Closure phase angle θcIt is equal toOrJust closure main contactor operation is executed, is at the phase angle of inverter output voltageOr At the time of put into transformer, it is minimum to put into the bias that transformer generates under the angle, realizes the inhibition to shoving;The closure Phase angle θcBy inverter output voltage real-time phase angle θinvWith main contactor action delay offset angle θd, and last master connects The correction angle △ θ of the actual phase of tentaculum closing moment is formed.
2. the method that energy accumulation current converter described in accordance with the claim 1 inhibits excitation surge current, it is characterised in that: the inversion is defeated Voltage real-time phase angle θ outinvIt is detected using software phase-lock loop method;Energy accumulation current converter inverter side voltage sample is obtained first Three-phase instantaneous value carry out Clark and Park transformation, alternating voltage is synchronised rotation from three phase static abc coordinate system transformation at two Turn under dq coordinate system, then q shaft voltage 0 is made by closed-loop control, realize locking phase, detects the inversion output of energy accumulation current converter at this time The phase angle of voltage, this phase angle are the real-time phase angle θ of the inverter output voltageinv
3. the method that energy accumulation current converter described in accordance with the claim 1 inhibits excitation surge current, it is characterised in that: the main contact Device action delay offset angle θdAccording to the intrinsic actuation time t of main contactordConversion:
Wherein, T is the period of inverter output voltage, T=20ms.
4. the method that energy accumulation current converter described in accordance with the claim 1 inhibits excitation surge current, it is characterised in that: main contactor closure The calculation method of the correction angle △ θ of the actual phase at moment is as follows:
The initial value of △ θ is 0 before main contactor is closed for the first time;
This closure phase angle of main contactor θcCalculation method it is as follows:
Wherein remainder indicates complementation, inverter output voltage real-time phase angle θinvWith main contactor action delay offset angle θd And the correction angle △ θ of the actual phase after main contactor last time closure is added divided by 2 π and takes the remainder and be denoted as closure phase angle θc, meet this closure phase angle of conditionOrMain contactor is in this closure phase angle θcAt the time of meeting condition Execute closed procedure;
Main contactor completes the practical closure phase angle θ that closure is the transformer investment momentc' detected using software phase-lock loop method, With inverter output voltage real-time phase angle θinvDetection method it is identical;
Correction angle △ θ=θ of actual phase after this closure of main contactorcc', as the angle compensation be closed next time before Value.
CN201811360097.1A 2018-11-15 2018-11-15 A kind of method that energy accumulation current converter inhibits excitation surge current CN109638865A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110932315A (en) * 2019-11-22 2020-03-27 北京科诺伟业科技股份有限公司 Phase selection control method of quick switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110932315A (en) * 2019-11-22 2020-03-27 北京科诺伟业科技股份有限公司 Phase selection control method of quick switch

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