CN111600487B - Control method for improving DCDC efficiency of charging station energy router system - Google Patents

Control method for improving DCDC efficiency of charging station energy router system Download PDF

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CN111600487B
CN111600487B CN202010178529.8A CN202010178529A CN111600487B CN 111600487 B CN111600487 B CN 111600487B CN 202010178529 A CN202010178529 A CN 202010178529A CN 111600487 B CN111600487 B CN 111600487B
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current
dcdc
zero
charging station
resonant
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CN111600487A (en
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李健勋
李鸿儒
范建华
徐鹏飞
赵新举
王庆园
纪华丽
金立亭
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Qingdao Topscomm Communication Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a control method for improving DCDC efficiency of a charging station energy router system, belonging to the field of medium and high voltageThe field of piezoelectric electric automobile charging stations. The invention collects the resonance current i r1 Signal, dynamically adjusting IGBT by software logic judging resonance current zero crossing point (S) 1 、S 2 、S 3 、S 4 、S 5 、S 6 、S 7 、S 8 ) And the switching-off moment solves the problem of hard switching phenomenon caused by the fact that parameters of a capacitor and an inductor change along with the temperature, the current and the service life when the series resonance type isolation DCDC topology is actually operated. The energy bidirectional flow capacity is ensured, meanwhile, zero current switching in the full load range of the DCDC converter is realized, the switching loss of the system is reduced, the overall efficiency of the electric vehicle charging station is improved, and the dynamic response of the system is ensured.

Description

Control method for improving DCDC efficiency of charging station energy router system
Technical Field
The invention relates to the field of medium and high voltage electric vehicle charging stations, in particular to a control method for improving the DCDC efficiency of a medium and high voltage electric vehicle charging station.
Background
The medium-high voltage electric vehicle charging station adopts an input-series output-parallel topology scheme, so that the switching frequency and the withstand voltage grade of a device of a single module on the alternating current side are reduced, and the alternating current side can be directly merged into a medium-high voltage power grid; the rear stage of the circuit is usually in a series resonance type isolation DCDC topology, the transformation ratio relation of the input and output voltages can be input and output by using open loop control, soft switching in a full power range can be realized, and the efficiency is improved, so that the circuit is widely applied. However, when the traditional open-loop control scheme realizes the energy bidirectional flow function, the parameters of the capacitor and the inductor can change along with the temperature, the current and the service life influence in the actual operation, so that the inherent resonant frequency point shifts, the resonant frequency and the switching frequency can not accurately correspond, the hard switching phenomenon is caused, and the system loss is increased.
Disclosure of Invention
The invention provides a control method for improving the DCDC efficiency of a charging station energy router system aiming at the defects and the requirements, solves the problem of hard switching caused by the change of system capacitance and inductance parameters on the premise of ensuring the bidirectional flow function of the DCDC isolation level energy, and is simple and easy to realize. The invention provides the following technical scheme:
the alternating current side of the medium-high voltage charging station adopts N H-bridge cascade structures to be directly merged into a medium-high voltage alternating current power grid, so that AC-DC conversion is realized; and a series resonance type isolation converter is connected behind each H-bridge structure to realize DCDC conversion and isolation. The outputs of the 3N series resonance type isolation converters are connected in parallel to form a low-voltage direct-current bus for a low-voltage direct-current charging pile; the cascade H bridge realizes the control of active component and reactive component; the series resonance type isolation converter realizes the characteristic of a direct current transformer by adjusting the duty ratio and the switching period of the original secondary side IGBT, and ensures that the ratio of output voltage to input voltage is the transformer transformation ratio; when a vehicle is connected to carry out charging operation, the system is started, the series resonance type isolation converter samples the resonance current, and the zero crossing point time t of the resonance current is carried out 0 Judging; according to the determined zero-crossing time and the switch-on time t of the switch tube in the half of the switching period s Calculating the resonant frequency f of the resonant current res Comparing with the resonant current frequency limiting condition to judge whether the zero crossing point is a real zero crossing point, and if the condition is met, determining the zero crossing point time as t 0 The drive signals of all the IGBTs are updated immediately, and if the conditions are not met, the output is repeated according to the last cycle of switching mode.
Further, as a preferred technical solution of the present invention: series resonance type isolation converter DCDC links S1, S4, S5 and S8 are first group of IGBTs, S2, S3, S6 and S7 are second group of IGBTs, the two groups of IGBTs drive signals to be complementary, and the level of each group of switches is switched by detecting zero-crossing time.
Further, as a preferable technical solution of the present invention: the method for judging the zero crossing point of the resonant current is to sample a current resonant current sample value i r1 And when it was lastSampling value i of resonance current r1_1 Multiplication, if the product is less than or equal to zero, the current sampling time t 0 Are possible zero crossing times.
Further, as a preferred technical solution of the present invention: the resonant current frequency limiting condition is f res Greater than or equal to 0.8f res * And is not more than 1.2f res * The correct current zero crossing is considered, where f res * Is the natural resonant frequency of the system, and the formula is:
Figure GDA0003754352440000021
in the formula, L and C are respectively equivalent series inductance and series capacitance in series resonant DCDC topology.
Further, as a preferred technical solution of the present invention: the updating mode of immediately updating the driving signals of all IGBTs after the real zero-crossing time is obtained is to invert the driving signals
Compared with the prior art, the invention has the advantages and positive effects that:
the scheme of the invention is simple and easy to implement, the control scheme has low complexity, the DCDC energy flow bidirectional flow function can be realized, the hard switching phenomenon caused by the change of inductance and capacitance parameters is solved, the system efficiency is improved, and the volume of the radiator is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application
FIG. 1 is a topological diagram of a medium-high voltage electric vehicle charging station;
FIG. 2 is a series resonant isolated DCDC topology;
FIG. 3 is a flow chart of a control method according to the present invention;
fig. 4(a) is a main waveform diagram of the series resonant isolated DCDC circuit after the inductance or capacitance parameter of the main circuit changes;
fig. 4(b) is a main waveform diagram of the series resonant isolated DCDC circuit after the inductance or capacitance parameter of the main circuit is changed by using the control method provided by the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be further described with reference to the accompanying drawings.
The topological diagram of the medium-high voltage electric vehicle charging station applied by the invention is shown in figure 1, the alternating current side of the medium-high voltage charging station adopts N H-bridge cascade structures to be directly merged into a medium-high voltage alternating current power grid and a high-voltage alternating current power grid, and AC-DC conversion is realized; and a series resonance type isolation converter is connected behind each H-bridge structure to realize DCDC conversion and isolation. The outputs of the 3N DCDC converters are connected in parallel to form a low-voltage direct-current bus for a low-voltage direct-current charging pile to use; the cascade H bridge realizes the control of active component and reactive component; the series resonance type DCDC circuit topology is shown in FIG. 2, wherein S1, S4, S5 and S8 are a first group of IGBTs, S2, S3, S6 and S7 are a second group of IGBTs, driving signals of the two groups of IGBTs are complementary, the direct current transformer characteristic is realized by adjusting the duty ratio and the switching period of the original secondary side IGBT, and the ratio of output voltage to input voltage to output voltage is guaranteed not to be changed by a transformer.
The flow chart of the adopted DCDC control method is shown in FIG. 3: when an automobile is connected to carry out charging operation, the system is started, the series resonance type isolation converter samples the resonance current, the zero-crossing time t0 of the resonance current is judged, and the current-time resonance current sampling value i is obtained r1 And the sampling value i of the resonant current at the last moment r1_1 Multiplying, if the product is less than or equal to zero at the current sampling time t 0 Are possible zero crossing times.
According to the determined zero crossing point moment and the switching-on moment t of the switching tube in the half switching period s Calculating the resonant frequency f of the resonant current by taking the reciprocal of the difference and dividing by 2 res The resonant current frequency limiting condition is f res Greater than or equal to 0.8f res * And is not more than 1.2f res * The correct current zero crossing is assumed, where f res * Is the natural resonant frequency of the system, and the formula is:
Figure GDA0003754352440000041
in the formula, L and C are respectively equivalent series inductance and series capacitance in series resonant DCDC topology.
And immediately inverting the driving signals of all the IGBTs after acquiring the correct zero-crossing point moment, and if the conditions are not met, repeatedly outputting the driving signals according to the switching mode of the previous period.
When the inductance or capacitance parameter in the DCDC main circuit changes, the main waveform diagram of the series resonance type isolation DCDC circuit is shown in fig. 4(a), and it can be seen from the diagram that the circuit is in a hard turn-off state;
after the control method provided by the invention is adopted, when the main waveform of the series resonance type isolation DCDC circuit is shown in fig. 4(b) after the inductance or capacitance parameter of the main circuit changes, the soft turn-off is realized, and the system efficiency is improved.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (4)

1. A control method for improving DCDC efficiency of a charging station energy router system, the method comprising the steps of:
the alternating current side of the medium-high voltage charging station adopts N H-bridge cascade structures to be directly merged into a medium-high voltage alternating current power grid, so that AC-DC conversion is realized; a series resonance type isolation converter is connected behind each H-bridge structure to realize DCDC conversion and isolation, and the outputs of 3N series resonance type isolation converters are connected in parallel to form a low-voltage direct-current bus for a low-voltage direct-current charging pile to use; the cascade H bridge realizes the control of active component and reactive component; the series resonance type isolation converter realizes the characteristic of the direct current transformer by adjusting the duty ratio and the switching period of the IGBT on the primary side and the secondary side, and ensures thatThe input-output voltage ratio is the transformer transformation ratio; when a vehicle is connected to carry out charging operation, the system is started, the series resonance type isolation converter samples the resonance current, and the zero crossing point time t of the resonance current is carried out 0 Judging; calculating the resonant frequency f of the resonant current according to the determined zero crossing point time res Comparing with the resonant current frequency limiting condition to judge whether the zero crossing point is a real zero crossing point, and if the condition is met, determining the zero crossing point time as t 0 Updating the driving signals of all IGBTs immediately, and if the driving signals do not meet the conditions, repeatedly outputting the driving signals according to the last period of switching;
wherein, the resonance current frequency limiting condition is that fres is more than or equal to 0.8fres and less than or equal to 1.2fres, which is the natural resonance frequency of the system, the current zero-crossing point is considered to be the correct current zero-crossing point, and the formula is as follows:
Figure FDA0003754352430000011
in the formula, L and C are respectively equivalent series inductance and series capacitance in series resonant DCDC topology.
2. The control method for improving the DCDC efficiency of the energy router system of the charging station according to claim 1, wherein said series resonant type isolation converters S1, S4, S5 and S8 are a first group of IGBTs, S2, S3, S6 and S7 are a second group of IGBTs, the driving signals of the two groups of IGBTs are complementary, and the level of each group of switches is switched by detecting the zero-crossing time.
3. The control method for improving the DCDC efficiency of the charging station energy router system as claimed in claim 1, wherein said zero-crossing point of the resonant current is determined by sampling the current time of the resonant current i r1 And the sampling value i of the resonant current at the last moment r1_1 Multiplication, if the product is less than or equal to zero, the current sampling time t 0 Are possible zero crossing times.
4. The control method for improving the efficiency of the charging station energy router system DCDC according to claim 1, wherein the updating of the driving signals of all IGBTs immediately after the real zero-crossing time is performed by inverting the driving signals.
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CN102023286A (en) * 2010-11-30 2011-04-20 中国工程物理研究院流体物理研究所 Zero current detection circuit for series resonance charging source and design method thereof
JP2017209015A (en) * 2017-09-04 2017-11-24 株式会社東芝 Power supply circuit for driving creeping discharge element
CN109728633A (en) * 2019-01-17 2019-05-07 中国科学院电工研究所 A kind of direct resonance frequency Phase Tracking control method of contactless power supply device
CN110190751A (en) * 2019-05-17 2019-08-30 中南大学 A kind of perseverance gain bi-directional DC-DC controlled resonant converter and its control method
CN110336320A (en) * 2019-07-10 2019-10-15 上海交通大学 A kind of new-energy grid-connected or on-site elimination system based on electric energy router

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CN110361596A (en) * 2019-06-18 2019-10-22 上海宝准电源科技有限公司 A kind of Resonance detector strategy based on zero-crossing examination

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102023286A (en) * 2010-11-30 2011-04-20 中国工程物理研究院流体物理研究所 Zero current detection circuit for series resonance charging source and design method thereof
JP2017209015A (en) * 2017-09-04 2017-11-24 株式会社東芝 Power supply circuit for driving creeping discharge element
CN109728633A (en) * 2019-01-17 2019-05-07 中国科学院电工研究所 A kind of direct resonance frequency Phase Tracking control method of contactless power supply device
CN110190751A (en) * 2019-05-17 2019-08-30 中南大学 A kind of perseverance gain bi-directional DC-DC controlled resonant converter and its control method
CN110336320A (en) * 2019-07-10 2019-10-15 上海交通大学 A kind of new-energy grid-connected or on-site elimination system based on electric energy router

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