CN110266016A - A kind of control strategy of the increase power factor applied to power decoupled PFC topology - Google Patents

A kind of control strategy of the increase power factor applied to power decoupled PFC topology Download PDF

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Publication number
CN110266016A
CN110266016A CN201910422914.XA CN201910422914A CN110266016A CN 110266016 A CN110266016 A CN 110266016A CN 201910422914 A CN201910422914 A CN 201910422914A CN 110266016 A CN110266016 A CN 110266016A
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voltage
phase
power
control
decoupling
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CN110266016B (en
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汪小青
陈敏
李博栋
陈宁
陈磊
孙欣楠
张东博
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Zhejiang University ZJU
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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
    • H02J3/01—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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
    • 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

Abstract

The present invention relates to power industry fields, it is desirable to provide a kind of control strategy of the increase power factor applied to power decoupled PFC topology.It include: to constitute power decoupled PFC topology by totem pillar non-bridge PFC circuits, control circuit and by the series arm that decoupling inductance and capacitor form；Phase offset between network voltage and power network current is formed into closed-loop control to compensate reference current phase, control is compensated to idle in topology, guarantees that grid-connected power is identical as required reference current phase pushing figure；The switching tube in circuit is controlled according to the reference signal generation circuit control signal of circuit state and external transmission or internal preset by unified controller.The present invention can inhibit harmonic wave, improve power quality, while realizing good power decoupled performance.It can quickly carry out phase only pupil filter with the variation of quick response reference signal and realize idle ring compensation.The present invention is suitable for inverter mode, does not influence the performance of AC/DC circuit two-way operation, realizes energy in bidirectional flow.

Description

A kind of control strategy of the increase power factor applied to power decoupled PFC topology
Technical field
The invention belongs to power industry fields, and in particular to a kind of raising power applied to power decoupled PFC topology because Several control strategies.The present invention is based on the controls of the operational mode of power decoupled PFC topology, for passive energy-storage travelling wave tube in the circuit Caused reactive power causes power factor reduction to propose corresponding optimisation strategy, is suitable for power decoupled, energy flow, defeated Enter multiple applications such as utility power quality control of output.
Background technique
As power electronic technique is in fields such as industrial automation, electric system, communications and transportation and renewable energy systems Development, efficient electrical power electronic converter technology have become realize High Power Factor and low input harmonic current key technology, Referred to as develop the enabling tool of power electronic technique.However, the extensive use of power electronic devices gets over harmonic pollution problems Come more serious.The IEC 61000-3-2 clear stipulaties limit value of Harmonics of Input component, in order to improve grid supply quality, Inhibit harmonic pollution, Power Correction Factor correction (PFC) technology is come into being.
Compared with traditional PFC topology, the new power decoupling PFC electricity with active power decoupling function Road, which has become, possesses one of efficient, mainstream topology of high power density, high reliability.In traditional PFC exchange side power contain compared with Two times of big power frequency components need big storage capacitor to carry out power decoupled.The presence of big capacity electrolyte capacitor, not only limits The reduction of system cost and the raising of power density, while electrolytic capacitor converts AC/DC as the main element for influencing the service life The reliability of device has extremely crucial influence.Power decoupled technology is always that the hot research of multiple fields is asked in recent years Topic.
In the numerous power decoupleds topology proposed at present, it will usually pay close attention to the topology in terms of decoupling effect and control performance Validity, decline problem without caused power quality in the case of considering non-ideal circuitry.However, due to most power decoupled Passive energy-storage travelling wave tube is more in circuit topology, and the reactive power of generation cannot be ignored, and will lead to power factor reduction, especially exists The occasion that input voltage is low, power grade is high, and lower power factor can cause certain impact to power grid.With traditional function Rate factor correcting circuit is compared, and novel decoupling circuit is faced with bigger harmonic wave challenge, and the reactive power of generation will affect power grid The sine degree of electric current causes grid side power factor low to influence power supply quality, influences the normal operation of equipment.
Summary of the invention
The invention solves technical solution be to overcome deficiency in the prior art, provide and a kind of be applied to power decoupled The control strategy of the increase power factor of PFC topology.
In order to solve the technical problem, solution of the invention is:
A kind of control strategy of increase power factor applied to power decoupled PFC topology is provided, comprising:
(1) it is constituted by totem pillar non-bridge PFC circuits, control circuit and by decoupling inductance and the series arm that capacitor forms Power decoupled PFC topology；Wherein, non-bridge PFC circuits are by boost inductance L1, switching tube Q1~4With bus capacitor CbusComposition, switch Pipe Q1~4Bridgeless Boost PFC topology is formed, wherein the Q of A bridge arm1~2Serve as PFC bridge arm；The Q of B bridge arm3~4As high-frequency tube with In voltage on line side vgCathode and complete machine ground between LC series connection decoupling branch constitute Buck circuit, switch motion will be originally female The voltage ripple that line capacitance is born is transferred to decoupling capacitance CdpOn, inductance L2Make energy snubber；The line inductance L of power gridg, electricity Hold C1With resistance L1Form LCL filter；
LC series connection decoupling branch includes decoupling capacitance and decoupling inductance, and decoupling capacitance is used to the transfer of smooth busbar voltage and comes Ripple, decoupling inductance play the role of energy snubber.The branch and busbar voltage and B bridge arm form Buck circuit, purpose It is two switching tubes for being multiplexed B bridge arm, the secondary ripple wave in busbar voltage is transferred on decoupling capacitance.Due to increased decoupling Capacitor's capacity is far smaller than the capacitance of original bus capacitor, can reduce device cost, improves complete machine power density.
(2) phase offset between the network voltage and power network current that will test forms closed-loop control to compensate with reference to electricity Phase is flowed, control is compensated to idle in topology, guarantees that grid-connected power is identical as required reference current phase pushing figure；
(3) by unified controller according to circuit state and external transmission or the reference signal generation circuit control of internal preset Signal processed controls the switching tube in circuit.
In the present invention, include: in the controller
Sampling unit, to the input voltage V from power gridg, interior inductive current IL1And busbar voltage VdcIt is sampled；
Phase locking unit, to input voltage VgLocking phase is carried out, the phase ω t of voltage on line side is obtained；
Busbar voltage fluctuation value is multiplied by multiplication unit with sinusoidal result obtained by phase locking unit；And
It decouples voltage-phase and refers to computing unit.
In the present invention, specifically includes the following steps:
(1) within each control period, controller detects the input voltage V of itselfg, interior inductive current IL1And bus Voltage Vdc, and signal is controlled according to the reference signal generation circuit of circuit state and external transmission or internal preset；Control loop It is made of busbar voltage outer shroud and power network current inner ring, and provides pwm control signal to the switching tube of A bridge arm, guarantee the AC/DC Circuit stability operates in that normal PFC working condition is bicyclic to be all made of classical PI control；
(2) controller detects busbar voltage VdcOn ripple, by corresponding decoupling voltage reference value is calculated Vref_rippleFor controlling the switching tube action of B bridge arm, the ripple that bus bar side is born is transferred on decoupling capacitance；
(3) controller detects the input voltage V of itselfg, interior inductive current IL1, except progress dispatch from foreign news agency pressure ring and interior electric current loop meter Outside calculating, itself real-time output reactive power Q in each control period is also calculatedout；It is made into the error that difference obtains with 0 again Value enters PI link and is integrated in real time, obtains interior inductive current ring phase reference correction angle θ；By to classical in step (1) The interior inductive current I of double -loop controlL1Idle ring compensation is carried out, realizes and the floating of electric network voltage phase is exported, guarantee to obtain Interior inductive current ring fixed phase accurately track to increase power factor；
(4) PLL locking phase is carried out to network voltage, locking phase value ω t is detected；Locking phase value ω t is subtracted step (3) to obtain To interior inductive current ring phase reference correction angle θ interior inductive current ring reference phase ω t- θ has been corrected as next week The interior inductive current ring phase reference of phase；
(5) to decoupling voltage reference value V in step (2)ref_rippleCarry out idle angle compensation；
Controller detects the input voltage V of itselfg, interior inductive current IL1, calculate each control period decoupling voltage Reference phase φ=arctan (ω L1IL1/Vg), two frequency multiplication benchmark, the 2 ω t that PLL locking phase obtains, which is carried out, with network voltage subtracts each other It obtains that decoupling voltage reference value of the decoupling 2 ω t- φ of voltage reference value as next period has been corrected, guarantees accurate decoupling effect.
Wherein, interior inductive current ring phase reference correction angle θ and decoupling voltage-phase reference value φ is in being directed to respectively Inductive current IL1With decoupling voltage reference value Vref_rippleTwo different reactive compensation correction angles.The former can significantly mention High complete machine topology power factor, the latter can be further improved decoupling ability, reduce DC side bus capacitor.
In the present invention, within each control period, PFC control carries out simultaneously with decoupling control, independent and mutual mutually It restrains.Not only it ensure that original PFC function, but also bus capacitor appearance can be reduced on the basis of not adding active device and sensor Value realizes power decoupled.
On the basis of by adopting the above technical scheme, the present invention can also be used or be combined using skill further below Art scheme:
(1) circuit topology described in includes and is not limited to single stage type and the two-way AC/DC variator of stage type.Compared to single-stage Formula structure compensates for complicated single stage type structure control, isolation difficulty, battery company although stage type structure number of devices is more The big disadvantage waited of place's capacitor is connect, is the topological structure of present mainstream；
(2) reference signal of external transmission or internal preset described in includes and is not limited to net side input voltage and electricity Stream, bus bar side output voltage and the target value with reference to decoupling voltage fluctuation state are modified；
(3) SOGI control model can be introduced, due to containing harmonic wave in power grid, SOGI accurate lock power grid base can be passed through Wave frequency rate, to introduce the higher sinusoidal reference of sine degree；
(4) communication mode involved in the external reference signal transmitted described in, includes and is not limited to following communication mode: (a) wired communication modes such as CAN communication, fiber optic communication, ethernet communication；(b) channel radios such as WiFi, ZigBee, bluetooth, infrared Letter mode.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention has taken into account power decoupled and power factor emendation function, can solve in power decoupled PFC topology due to The technical problem of the decline of power factor caused by passive energy-storage travelling wave tube, inhibits harmonic wave, improves power quality, while realizing good Power decoupled performance.
(2) external reference signal that either communications are obtained, or the reference for controller internal preset Signal, control method of the invention can quickly be carried out phase only pupil filter and be realized idle ring with the variation of quick response reference signal Compensation.
(3) control method of the invention is equally applicable to the inverter mode of the topology, i.e., it is double not influence script AC/DC circuit To the performance (forward direction is used as Active PFC, is reversely used as parallel network reverse) of work, the two-way flow of energy may be implemented.If Work under inverter mode, interior inductive current ring phase reference correction angle θ and decoupling voltage-phase reference value φ be move to left so that Each power section balance.
Detailed description of the invention
Fig. 1 is power decoupled PFC topology schematic diagram of the present invention.
Fig. 2 is the control strategy general diagram of power decoupled PFC topology increase power factor of the present invention.
Specific embodiment
The control strategy of power decoupled PFC topology increase power factor of the present invention is based on totem pillar without bridge What the additional LC series arm of pfc circuit and its controller were realized.The schematic diagram of the AC/DC converter and controller as shown in Figure 1, Wherein non-bridge PFC circuits are by boost inductance L1, switching tube Q1~4With bus capacitor CbusComposition, additional LC series connection decoupling branch, and Controller is controlled according to the reference signal generation circuit control signal of circuit state and external transmission or internal preset.
In Fig. 1: vgAnd igIt is net side alternating voltage and electric current, v respectivelyoutAnd vdpIt is bus capacitor C respectivelybusAnd decoupling Branch capacitor CdpOn voltage.Switching tube Q1~4Bridgeless Boost PFC topology is formed, wherein the Q of A bridge arm1~2PFC bridge arm is served as, High-frequency work realizes PFC function, L in switching frequency1It is the boost inductance in pfc circuit；The Q of B bridge arm3~4It is originally used for power frequency pipe, Make high-frequency tube herein and in voltage on line side vgCathode and complete machine ground between LC series connection decoupling branch constitute Buck circuit, open The voltage ripple that script bus capacitor is born is transferred to decoupling capacitance C by pass movementdpOn, L2Make energy snubber.Net side Lg、C1 With L1LCL filter is formed, net side inductance utilizes the line inductance L of power gridgInstead of.RgSide equivalent internal resistance is exchanged for power grid.It is external The reference signal of transmission is transferred to controller from outside by communication equipment.
Decoupling branch includes decoupling capacitance and decoupling inductance, and decoupling capacitance is used to smooth busbar voltage and shifts the line to come Wave, decoupling inductance play the role of energy snubber.The branch and busbar voltage and B bridge arm form Buck circuit, it is therefore an objective to multiple With two switching tubes of B bridge arm, the secondary ripple wave in busbar voltage is transferred on decoupling capacitance.Due to increased decoupling capacitance Capacitance is far smaller than the capacitance of original bus capacitor, can reduce device cost, improves complete machine power density.
It include: sampling unit in controller, to the input voltage V from the power gridg, interior inductive current IL1And bus Voltage VdcIt is sampled；Phase locking unit carries out locking phase to the input voltage, to obtain the phase ω t of the voltage on line side； The busbar voltage fluctuation value is multiplied by multiplication unit with sinusoidal result obtained by the phase locking unit；And decoupling voltage-phase With reference to computing unit.
Control strategy of the invention can be used in decoupling PFC topology, and can improve function while realizing power decoupled Rate factor, the specific steps are as follows:
Step 1: within each control period, controller detects current circuit state, and according to circuit state and outside The reference signal generation circuit of transmission or internal preset controls signal, as shown in Figure 1.Controller detects the input voltage of itself Vg, interior inductive current IL1And busbar voltage Vdc, control loop is mainly made of busbar voltage outer shroud and power network current inner ring, and A bridge arm pwm control signal is given, guarantees that the AC/DC circuit stability operates in that normal PFC working condition is bicyclic to be all made of classical PI control System；
Step 2: between voltage on line side cathode and ground plus a LC series connection decouples branch, as shown in Figure 1.Controller detection Busbar voltage VdcOn ripple, by corresponding decoupling voltage reference value V is calculatedref_rippleTo control B bridge arm switching tube The ripple that bus bar side is born is transferred on decoupling capacitance by movement.
Step 3: to inductive current I in classics double -loop control described in step 1L1Carry out idle ring compensation.Controller detection is certainly The input voltage V of bodyg, interior inductive current IL1, calculated in addition to carrying out dispatch from foreign news agency pressure ring and interior electric current loop, also need to calculate each control Itself real-time output reactive power Q in period processedout；QoutThe error amount obtained with 0 work difference enters PI link and is integrated in real time, Obtain interior inductive current ring phase reference correction angle θ.Introducing PI compensation tache can be realized the floating to electric network voltage phase Output, the interior inductive current ring fixed phase guaranteed accurately track to increase power factor.
Step 4: PLL locking phase being carried out to network voltage, locking phase value is detected.Locking phase value ω t is subtracted step 3 to obtain Interior inductive current ring phase reference correction angle θ interior inductive current ring reference phase ω t- θ has been corrected as next period Interior inductive current ring phase reference.
Step 5: to decoupling voltage reference value V in step 2ref_rippleCarry out idle angle compensation.Controller detects itself Input voltage Vg, interior inductive current IL1, calculate each control period decoupling voltage-phase reference value φ=arctan (ω L1IL1/Vg), two frequency multiplication benchmark, the 2 ω t obtained with network voltage progress PLL locking phase, which subtracts each other to obtain, has been corrected decoupling Voltage Reference Decoupling voltage reference value of the 2 ω t- φ of value as next period, guarantees accurate decoupling effect.
Two correction angles θ and φ during progress reactive compensation are to be directed to interior inductive current I respectivelyL1With decoupling voltage Reference value Vref_rippleTwo different reactive compensation correction angles.The former can increase substantially complete machine topology power factor, The latter can be further improved decoupling ability, reduce DC side bus capacitor.
Within each control period, PFC control carries out simultaneously with decoupling control, mutual independence and checks and balance, both protected Original PFC function has been demonstrate,proved, and bus capacitor capacitance can be reduced on the basis of not adding active device and sensor, has realized power Decoupling.

Claims (4)

1. a kind of control strategy of the increase power factor applied to power decoupled PFC topology, it is characterised in that:
(1) power is constituted by totem pillar non-bridge PFC circuits, control circuit and by the series arm that decoupling inductance and capacitor form Decouple PFC topology；Wherein, non-bridge PFC circuits are by boost inductance L1, switching tube Q1~4With bus capacitor CbusComposition, switching tube Q1~4 Bridgeless Boost PFC topology is formed, wherein the Q of A bridge arm1~2Serve as PFC bridge arm；The Q of B bridge arm3~4As high-frequency tube and in net side Voltage vgCathode and complete machine ground between LC series connection decoupling branch constitute Buck circuit, switch motion is by script bus capacitor The voltage ripple of receiving is transferred to decoupling capacitance CdpOn, inductance L2Make energy snubber；The line inductance L of power gridg, capacitor C1With Resistance L1Form LCL filter；
(2) phase offset between the network voltage and power network current that will test forms closed-loop control to compensate reference current phase Position, compensates control to idle in topology, guarantees that grid-connected power is identical as required reference current phase pushing figure；
(3) letter is controlled according to the reference signal generation circuit of circuit state and external transmission or internal preset by unified controller Number the switching tube in circuit is controlled.
2. control strategy according to claim 1, which is characterized in that include: in the controller
Sampling unit, to the input voltage V from power gridg, interior inductive current IL1And busbar voltage VdcIt is sampled；
Phase locking unit, to input voltage VgLocking phase is carried out, the phase ω t of voltage on line side is obtained；
Busbar voltage fluctuation value is multiplied by multiplication unit with sinusoidal result obtained by phase locking unit；And
It decouples voltage-phase and refers to computing unit.
3. control strategy according to claim 1, which is characterized in that specifically includes the following steps:
(1) within each control period, controller detects the input voltage V of itselfg, interior inductive current IL1And busbar voltage Vdc, and signal is controlled according to the reference signal generation circuit of circuit state and external transmission or internal preset；Control loop is by mother Line voltage outer ring and power network current inner ring composition, and pwm control signal is provided to the switching tube of A bridge arm, guarantee the AC/DC circuit Stable operation is all made of classical PI control normal PFC working condition is bicyclic；
(2) controller detects busbar voltage VdcOn ripple, by corresponding decoupling voltage reference value V is calculatedref_ripple For controlling the switching tube action of B bridge arm, the ripple that bus bar side is born is transferred on decoupling capacitance；
(3) controller detects the input voltage V of itselfg, interior inductive current IL1, except progress dispatch from foreign news agency pressure ring and interior electric current loop calculate Outside, itself real-time output reactive power Q in each control period is also calculatedout；It is made into the error amount that difference obtains with 0 again It is integrated in real time into PI link, obtains interior inductive current ring phase reference correction angle θ；By to classical double in step (1) The interior inductive current I of ring controlL1Idle ring compensation is carried out, realizes and the floating of electric network voltage phase is exported, guarantee Interior inductive current ring fixed phase accurately tracks to increase power factor；
(4) PLL locking phase is carried out to network voltage, locking phase value ω t is detected；Locking phase value ω t is subtracted what step (3) obtained Interior inductive current ring phase reference correction angle θ's has been corrected interior inductive current ring reference phase ω t- θ as next period Interior inductive current ring phase reference；
(5) to decoupling voltage reference value V in step (2)ref_rippleCarry out idle angle compensation；
Controller detects the input voltage V of itselfg, interior inductive current IL1, calculate each control period decoupling voltage-phase Reference value φ=arctan (ω L1IL1/Vg), two frequency multiplication benchmark, the 2 ω t that PLL locking phase obtains, which is carried out, with network voltage subtracts each other to obtain Decoupling voltage reference value of the decoupling 2 ω t- φ of voltage reference value as next period has been corrected, guarantees accurate decoupling effect.
4. control strategy according to claim 3, which is characterized in that within each control period, PFC control and decoupling It control while carrying out, mutual independence and checks and balance.
CN201910422914.XA 2019-05-21 2019-05-21 Control strategy applied to power decoupling PFC topology and used for improving power factor Active CN110266016B (en)

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CN112909972A (en) * 2021-01-27 2021-06-04 浙江大学 Decoupling topology bidirectional mode switching strategy applied to V2G energy storage equipment scheduling
CN112910242A (en) * 2021-01-27 2021-06-04 浙江大学 Decoupling voltage duty cycle compensation strategy applied to H bridge

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CN110798055A (en) * 2019-11-19 2020-02-14 合肥工业大学 Single-phase inverter power decoupling control method based on direct current feedback
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CN112909972A (en) * 2021-01-27 2021-06-04 浙江大学 Decoupling topology bidirectional mode switching strategy applied to V2G energy storage equipment scheduling
CN112910242A (en) * 2021-01-27 2021-06-04 浙江大学 Decoupling voltage duty cycle compensation strategy applied to H bridge

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