CN110445153A - A kind of two-way AC/DC converter for realizing power quality controlling - Google Patents
A kind of two-way AC/DC converter for realizing power quality controlling Download PDFInfo
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- CN110445153A CN110445153A CN201910723569.3A CN201910723569A CN110445153A CN 110445153 A CN110445153 A CN 110445153A CN 201910723569 A CN201910723569 A CN 201910723569A CN 110445153 A CN110445153 A CN 110445153A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 230000005611 electricity Effects 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims 2
- 230000002457 bidirectional effect Effects 0.000 claims 1
- 238000005457 optimization Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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Classifications
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- 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
Abstract
The present invention relates to the stable operation fields of AC/DC converter two-way in alternating current-direct current mixing micro-capacitance sensor, refer specifically to a kind of two-way AC/DC converter of achievable power quality controlling.When alternating current-direct current mixing micro-capacitance sensor is in uneven operating condition, the present invention is according to two-way AC/DC converter with the different requirements for carrying situation and AC and DC busbar voltage quality, the power quality problems such as uneven ac-side current, instantaneous active power fluctuation, DC bus-bar voltage fluctuation are solved respectively, so that two-way AC/DC converter is may operate in current imbalance compensation, three kinds of Voltage unbalance compensation, DC voltage stability mode, achieves power bi-directional transmission and be uniformly controlled with power quality controlling.Therefore, the present invention improves the utilization rate of two-way AC/DC converter, reduces the investment and operating cost of micro-capacitance sensor, has saved the space of micro-capacitance sensor, it is ensured that the optimization stable operation of micro-capacitance sensor.
Description
Technical field
The present invention relates to field of power electronics, a kind of realization electricity in alternating current-direct current mixing micro-capacitance sensor is referred specifically under uneven operating condition
The two-way AC/DC converter of energy quality controlling.
Background technique
Under the dual-pressure of environmental protection and energy demand, distributed power generation becomes the important promotion of power system development
Power.Current micro-capacitance sensor type has: direct-current grid, exchange micro-capacitance sensor and alternating current-direct current mixing micro-capacitance sensor, alternating current-direct current mix micro- electricity
Net can greatly reduce multiple AC/DC or DC/AC converter bring power damage in direct-current grid or exchange micro-capacitance sensor because of it
It consumes and the extensive research by domestic and foreign scholars.Alternating current-direct current mixing micro-capacitance sensor includes distributed generation unit, energy storage device, exchange
Load and DC load, two-way AC/DC converter are connected to exchange subnet and direct current subnet with DC bus by ac bus,
It is the core of alternating current-direct current mixing micro-capacitance sensor energy hole.
In alternating current-direct current mixing micro-capacitance sensor, three-phase power grid voltage is uneven or threephase load asymmetry will lead to system and go out
Existing voltage imbalance question, and then many detrimental effects: oscillation of power, DC bus electricity are caused to two-way AC/DC converter
Pressure fluctuation, exchange side three-phase current unbalance etc..In order to solve these problems, series-parallel active filter etc. is generallyd use at present
Power quality adjusting device realizes above-mentioned control target, but this can bring additional cost of investment and operation and maintenance cost, increases
The volume of big system, reduces the reliability of system.
In addition, due to the uncertainty that distributed generation unit is contributed in micro-capacitance sensor, based on two-way AC/DC converter
Converter and power quality adjusting device utilization rate are very low, and even in dead status, it is superfluous often to will cause a large amount of capacity
It is remaining.If the quantity of power conversion device and power quality adjusting device is reduced, the case where lacking converter coordinated control
Under, then it will lead to system power vacancy, influence the stable operation of system.
Summary of the invention
The purpose of the present invention is go to solve active power oscillations, exchange side using the margin of power of two-way AC/DC converter
The power quality problems such as current imbalance, exchange side Voltage unbalance, DC voltage fluctuation, for prior art defect, if
A kind of two-way AC/DC converter of achievable power quality controlling is counted.
The technical solution of the present invention is as follows:
A kind of two-way AC/DC converter of achievable power quality controlling, is three phase full bridge circuit, including parallel with one another
Three groups of bridge arms, every group of bridge arm all include two IGBT being serially connected, and IGBT is made of power tube and antiparallel diode, and three
The DC side of phase full-bridge circuit is connected with DC power supply, and exchange side uses LC filter circuit, through public grid entry point PCC and bulk power grid
It is connected.
Under uneven operating condition, two-way AC/DC converter exchange side voltage and current is uneven, and there are negative sequence components:
U=u++u- (1)
I=i++i- (2)
The instantaneous active power p of two-way AC/DC converter transmission:
In formula: P is the steady-state component of instantaneous active power, and Δ P is the wave component of instantaneous active power.
The instantaneous power of DC side transmission may be expressed as:
In formula, dαAnd dβRepresent the duty ratio under α β coordinate system；udcRepresent the voltage of DC side transmission, udcRepresent DC side
The electric current of transmission, iα, iβIndicate the alternating current under α β coordinate system.
Therefore, active power is only existed in the instantaneous power of two-way AC/DC converter DC side transmission, and is equal to exchange side
The instantaneous active power p of transmission, therefore that side instantaneous active power is only exchanged with converter is related for DC bus-bar voltage, and exchanges side wink
When reactive power it is unrelated.When micro-capacitance sensor is in uneven operating condition, DC bus-bar voltage is deposited with side instantaneous active power is exchanged
It is fluctuating.
For exchange side imbalance of three-phase voltage, exchange side three-phase current unbalance and DC voltage under uneven operating condition
The power quality problems such as two double-frequency fluctuations, according to two-way AC/DC converter with carrying situation and AC and DC busbar voltage quality
Difference requires, its working method is divided into three kinds of main operational modals.
(1) current imbalance compensates mode
When two-way AC/DC converter heavy duty or full-load run, control target is to transmit biggish active power, and the present invention will
70% more than two-way AC/DC converter rated power is considered as heavy duty.When exchanging side three-phase current unbalance, peak value may
Can be beyond the maximum current for allowing converter to pass through, if not administered, it can only be by reducing the instantaneous of interface converter transmission
Active power avoids the electric current out-of-limit.The power quality of system on AC side three-phase current is more demanding at this time, controls converter
Operate in current imbalance compensation mode.At this point, exchange side three-phase current is sinusoidal and balances, negative sequence component u-It is zero, exchange
Side three-phase voltage is still uneven, negative sequence component i-It is not zero.By formula (3) it is found that two-way AC/DC converter exchange side instantaneously has
Function power waves momentum Δ P is not zero.By formula (4) it is found that DC bus-bar voltage there is also fluctuations.
(2) Voltage unbalance compensates mode
When two-way AC/DC converter light running, the exchange lesser out-of-balance current in side will not make converter overcurrent, also not
It will limit the instantaneous active power that converter is transmitted, and have biggish margin of power, converter light running at this time controls mesh
Mark is no longer symmetrical alternating current side three-phase current to transmit maximum active power.But the margin of power of converter is made full use of,
It is seen as voltage compensator, is required according to difference of the system to AC and DC side quality of voltage, control target is exchange side three
Phase voltage balance or DC voltage are without two double-frequency fluctuations.
When, there are when sensitive loads, control target is exchange side three-phase voltage balance, controls two-way AC/DC in exchange subnet
Converter operates in Voltage unbalance compensation mode.At this point, exchange side three-phase voltage is sinusoidal and balances, negative sequence component u-For
Zero, exchange side three-phase current is still uneven, negative sequence component i-It is not zero.By formula (3) it is found that interface converter exchange side is instantaneous
Active power fluctuation amount Δ P is not zero.By formula (4) it is found that DC bus-bar voltage has fluctuation.
(3) DC voltage stability mode
When, there are when sensitive loads, control target is DC voltage without two double-frequency fluctuations, control transformation in direct current subnet
Device operates in DC voltage stability mode.By formula (3) it is found that two-way AC/DC converter exchange side instantaneous active power contains only
Steady-state component, wave component Δ P is zero.By formula (4) it is found that in the mode, need to guarantee exchange side three-phase voltage with exchange
The negative sequence component u of side three-phase current-And i-It is not zero, two parts in wave component is made to cancel out each other, reach instantaneous active function
The target that the wave component of rate is zero.At this point, exchange side three-phase voltage with to exchange side three-phase current uneven.
For the realization of two-way AC/DC converter three of the above primary modal operation control, consideration converter first is two-way
The basic function of power transmission first judges that the band of converter carries situation, if heavily loaded, converter is as current compensator, operation
Mode is compensated in current imbalance；If underloading, converter is as voltage compensator, by judging ac bus voltage unbalance factor
Whether more than 2%, control converter operates in Voltage unbalance compensation mode or DC voltage stability mode: ac bus voltage
Degree of unbalancedness is more than 2%, and converter operates in Voltage unbalance compensation mode；Ac bus voltage unbalance factor is less than 2%,
Converter operates in DC voltage stability mode.
A kind of two-way AC/DC converter of achievable power quality controlling provided by the present invention, compared with prior art,
When alternating current-direct current mixing micro-capacitance sensor is in uneven operating condition, in the case where not increasing extra means, converted according to two-way AC/DC
Requiring with the difference for carrying situation and AC and DC busbar voltage quality for device, solves ac-side current imbalance, instantaneous active respectively
The power quality problems such as power swing, DC bus-bar voltage fluctuation, improve the utilization rate of two-way AC/DC converter, reduce
The investment and operating cost of micro-capacitance sensor, have saved the space of micro-capacitance sensor, it is ensured that micro-capacitance sensor can optimize stable operation.
Detailed description of the invention
Fig. 1 is the two-way AC/DC transformer configuration figure of achievable power quality controlling involved in the present invention；
Fig. 2 is a variety of compensation Model control flow charts involved in the present invention.
Specific embodiment
The purpose of the present invention is go to solve active power oscillations, exchange side using the margin of power of two-way AC/DC converter
The power quality problems such as current imbalance, exchange side Voltage unbalance, DC voltage fluctuation, for prior art defect, if
A kind of two-way AC/DC converter of achievable power quality controlling is counted.
The technical solution of the present invention is as follows:
A kind of two-way AC/DC converter of achievable power quality controlling, is three phase full bridge circuit, including parallel with one another
Three groups of bridge arms, every group of bridge arm all include two IGBT being serially connected, and IGBT is made of power tube and antiparallel diode, and three
The DC side of phase full-bridge circuit is connected with DC power supply, and exchange side uses LC filter circuit, through public grid entry point PCC and bulk power grid
It is connected.
Under uneven operating condition, two-way AC/DC converter exchange side voltage and current is uneven, and there are negative sequence components:
U=u++u- (1)
I=i++i- (2)
The instantaneous active power of two-way AC/DC converter transmission:
In formula: P is the steady-state component of instantaneous active power, and Δ P is the wave component of instantaneous active power.
The instantaneous power of DC side transmission may be expressed as:
In formula, dαAnd dβRepresent the duty ratio under α β coordinate system；udcRepresent the voltage of DC side transmission, udcRepresent DC side
The electric current of transmission, iα, iβIndicate the alternating current under α β coordinate system.
Therefore, active power is only existed in the instantaneous power of two-way AC/DC converter DC side transmission, and is equal to exchange side
The instantaneous active power p of transmission, therefore that side instantaneous active power is only exchanged with converter is related for DC bus-bar voltage, and exchanges side wink
When reactive power it is unrelated.When micro-capacitance sensor is in uneven operating condition, DC bus-bar voltage is deposited with side instantaneous active power is exchanged
It is fluctuating.
For exchange side imbalance of three-phase voltage, exchange side three-phase current unbalance and DC voltage under uneven operating condition
The power quality problems such as two double-frequency fluctuations, according to two-way AC/DC converter with carrying situation and AC and DC busbar voltage quality
Difference requires, its working method is divided into three kinds of main operational modals.
(1) current imbalance compensates mode
When two-way AC/DC converter heavy duty or full-load run, control target is to transmit biggish active power, and the present invention will
It is considered as heavy duty (P > 0.7P more than the 70% of two-way AC/DC converter rated powerrate).When exchange side three-phase current unbalance
When, peak value may be beyond the maximum current for allowing converter to pass through, if not administered, can only be by reducing interface transformation
The instantaneous active power of device transmission avoids the electric current out-of-limit.At this time system on AC side three-phase current power quality require compared with
Height, control converter operate in current imbalance compensation mode.At this point, exchange side three-phase current is sinusoidal and balances, negative phase-sequence point
Measure u-It is zero, exchange side three-phase voltage is still uneven, negative sequence component i-It is not zero.By formula (3) it is found that interface converter exchanges
Side instantaneous active power undulate quantity Δ P is not zero.By formula (4) it is found that DC bus-bar voltage there is also fluctuations.
(2) Voltage unbalance compensates mode
When two-way AC/DC converter light running, the exchange lesser out-of-balance current in side will not make converter overcurrent, also not
It will limit the instantaneous active power that converter is transmitted, and have biggish margin of power, converter light running at this time controls mesh
Mark is no longer symmetrical alternating current side three-phase current to transmit maximum active power.But the margin of power of converter is made full use of,
It is seen as voltage compensator, is required according to difference of the system to AC and DC side quality of voltage, control target is exchange side three
Phase voltage balance or DC voltage are without two double-frequency fluctuations.
When, there are when sensitive loads, control target is exchange side three-phase voltage balance, control interface transformation in exchange subnet
Device operates in Voltage unbalance compensation mode.At this point, exchange side three-phase voltage is sinusoidal and balances, negative sequence component u-It is zero, hands over
It is still uneven to flow side three-phase current, negative sequence component i-It is not zero.By formula (3) it is found that interface converter exchanges side instantaneous active
Power waves momentum Δ P is not zero.By formula (4) it is found that DC bus-bar voltage has fluctuation.
(3) DC voltage stability mode
When, there are when sensitive loads, control target is DC voltage without two double-frequency fluctuations, control transformation in direct current subnet
Device operates in DC voltage stability mode.By formula (3) it is found that interface converter exchange side instantaneous active power contains only stable state point
Amount, wave component Δ P is zero.By formula (4) it is found that in the mode, need to guarantee exchange side three-phase voltage with exchange side three-phase
The negative sequence component u of electric current-And i-It is not zero, two parts in wave component is made to cancel out each other, reach the wave of instantaneous active power
The target that dynamic component is zero.At this point, exchange side three-phase voltage with to exchange side three-phase current uneven.
For the realization of two-way AC/DC converter three of the above primary modal operation control, consideration converter first is two-way
The basic function of power transmission first judges that the band of converter carries situation, if heavily loaded, converter is as current compensator, operation
Mode is compensated in current imbalance；If underloading, converter is as voltage compensator, by judging ac bus voltage unbalance factor
Whether more than 2%, control converter operates in Voltage unbalance compensation mode or DC voltage stability mode: ac bus voltage
Degree of unbalancedness is more than 2%, and converter operates in Voltage unbalance compensation mode；Ac bus voltage unbalance factor is less than 2%,
Converter operates in DC voltage stability mode.
A kind of two-way AC/DC converter of achievable power quality controlling provided by the present invention, compared with prior art,
When alternating current-direct current mixing micro-capacitance sensor is in uneven operating condition, in the case where not increasing extra means, converted according to two-way AC/DC
Requiring with the difference for carrying situation and AC and DC busbar voltage quality for device, solves ac-side current imbalance, instantaneous active respectively
The power quality problems such as power swing, DC bus-bar voltage fluctuation, improve the utilization rate of two-way AC/DC converter, reduce
The investment and operating cost of micro-capacitance sensor, have saved the space of micro-capacitance sensor, it is ensured that micro-capacitance sensor can optimize stable operation.
Claims (2)
1. a kind of two-way AC/DC converter for realizing power quality controlling, is three phase full bridge circuit, including parallel with one another three groups
Bridge arm, every group of bridge arm all include two IGBT being serially connected, and IGBT is made of power tube and antiparallel diode, and three-phase is complete
The DC side of bridge circuit is connected with DC power supply, and exchange side uses LC filter circuit, through public grid entry point PCC and bulk power grid phase
Even.
2. a kind of two-way AC/DC converter for realizing power quality controlling as described in claim 1, its feature is as follows:
Under uneven operating condition, two-way AC/DC converter exchange side voltage and current is uneven, and there are negative sequence components:
U=u++u- (1)
I=i++i- (2)
The instantaneous active power p of two-way AC/DC converter transmission:
In formula: P is the steady-state component of instantaneous active power, and Δ P is the wave component of instantaneous active power；
The instantaneous power of DC side transmission may be expressed as:
In formula, dαAnd dβRepresent the duty ratio under α β coordinate system；udcRepresent the voltage of DC side transmission, udcRepresent DC side transmission
Electric current, iα, iβIndicate the alternating current under α β coordinate system；
Therefore, active power is only existed in the instantaneous power of two-way AC/DC converter DC side transmission, and is equal to the transmission of exchange side
Instantaneous active power p, therefore that side instantaneous active power is only exchanged with converter is related for DC bus-bar voltage, and exchanges the instantaneous nothing in side
Function power is unrelated；When micro-capacitance sensor is in uneven operating condition, there is wave with side instantaneous active power is exchanged in DC bus-bar voltage
It is dynamic；
For exchange side imbalance of three-phase voltage, exchange side three-phase current unbalance and two times of DC voltage under uneven operating condition
The power quality problem of frequency fluctuation, according to two-way AC/DC converter with the difference for carrying situation and AC and DC busbar voltage quality
It is required that its working method is divided into three kinds of main operational modals；
(1) current imbalance compensates mode
When two-way AC/DC converter heavy duty or full-load run, control target is to transmit biggish active power；When exchange side three-phase
When current imbalance, peak value may can only pass through drop if not administered beyond the maximum current for allowing converter to pass through
The instantaneous active power of low interface converter transmission avoids electric current out-of-limit；The electric energy matter of system on AC side three-phase current at this time
Measure it is more demanding, control converter operate in current imbalance compensation mode；At this point, exchange side three-phase current is sinusoidal and balances,
Its negative sequence component u-It is zero, exchange side three-phase voltage is still uneven, negative sequence component i-It is not zero；By formula (3) it is found that two-way AC/
DC converter exchange side instantaneous active power undulate quantity Δ P is not zero；By formula (4) it is found that DC bus-bar voltage there is also fluctuations；
(2) Voltage unbalance compensates mode
When two-way AC/DC converter light running, the exchange lesser out-of-balance current in side will not make converter overcurrent, will not limit
The instantaneous active power that converter processed is transmitted, and have biggish margin of power, converter light running at this time, control target is not
It is symmetrical alternating current side three-phase current again to transmit maximum active power, but makes full use of the margin of power of converter, by it
Regard voltage compensator as, required according to difference of the system to AC and DC side quality of voltage, control target is exchange side three-phase electricity
Weighing apparatus or DC voltage are flattened without two double-frequency fluctuations；
When, there are when sensitive loads, control target is exchange side three-phase voltage balance, control interface converter fortune in exchange subnet
Row compensates mode in Voltage unbalance；At this point, exchange side three-phase voltage is sinusoidal and balances, negative sequence component u-It is zero, exchanges side
Three-phase current is still uneven, negative sequence component i-It is not zero；By formula (3) it is found that two-way AC/DC converter exchanges side instantaneous active
Power waves momentum Δ P is not zero；By formula (4) it is found that DC bus-bar voltage has fluctuation；
(3) DC voltage stability mode
When, there are when sensitive loads, control target is DC voltage without two double-frequency fluctuations, controls converter fortune in direct current subnet
Row is in DC voltage stability mode；By formula (3) it is found that two-way AC/DC converter exchange side instantaneous active power contains only stable state
Component, wave component Δ P is zero；By formula (4) it is found that in the mode, need to guarantee exchange side three-phase voltage with exchange side three
The negative sequence component u of phase current-And i-It is not zero, so that two parts in wave component is cancelled out each other, reach instantaneous active power
The target that wave component is zero；At this point, exchange side three-phase voltage with to exchange side three-phase current uneven；
For the realization of two-way AC/DC converter three of the above primary modal operation control, first consideration converter bidirectional power
The basic function of transmission first judges that the band of converter carries situation, if heavily loaded, converter operates in electricity as current compensator
Flow imbalance compensation mode；If underloading, converter is as voltage compensator, by whether judging ac bus voltage unbalance factor
More than 2%, control converter operates in Voltage unbalance compensation mode or DC voltage stability mode: ac bus voltage is uneven
Weighing apparatus degree is more than 2%, and converter operates in Voltage unbalance compensation mode；Ac bus voltage unbalance factor is less than 2%, transformation
Device operates in DC voltage stability mode.
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| CN110736869B (en) * | 2019-11-13 | 2021-11-12 | 平顶山学院 | Current separation method, device and equipment for single-phase circuit |
| CN111740454A (en) * | 2020-07-22 | 2020-10-02 | 太原理工大学 | Hybrid microgrid alternating current-direct current voltage unified control method based on bus interface converter |
| CN111740454B (en) * | 2020-07-22 | 2023-07-07 | 太原理工大学 | Mixed micro-grid alternating-current and direct-current voltage unified control method based on bus interface converter |
| CN113517724A (en) * | 2021-04-09 | 2021-10-19 | 国网山西省电力公司电力科学研究院 | Method for suppressing voltage ripple on direct current side of alternating current-direct current hybrid micro-grid |
| CN113541515A (en) * | 2021-06-07 | 2021-10-22 | 国网福建省电力有限公司泉州供电公司 | Control method and terminal for AC/DC bus interface converter |
| CN113612253A (en) * | 2021-08-06 | 2021-11-05 | 北京空间飞行器总体设计部 | High-voltage bus spacecraft power grid-connected control device |
| CN113612253B (en) * | 2021-08-06 | 2024-02-09 | 北京空间飞行器总体设计部 | High-voltage bus spacecraft power grid-connected control device |
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