CN116587885A - Control circuit and control method for cascaded double-winding motor of three-phase PFC circuit - Google Patents
Control circuit and control method for cascaded double-winding motor of three-phase PFC circuit Download PDFInfo
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- CN116587885A CN116587885A CN202310871095.3A CN202310871095A CN116587885A CN 116587885 A CN116587885 A CN 116587885A CN 202310871095 A CN202310871095 A CN 202310871095A CN 116587885 A CN116587885 A CN 116587885A
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- 238000005070 sampling Methods 0.000 claims description 31
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2220/00—Electrical machine types; Structures or applications thereof
- B60L2220/40—Electrical machine applications
- B60L2220/42—Electrical machine applications with use of more than one motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a control circuit and a control method for a three-phase PFC circuit cascaded double-winding motor. The power supply device mainly comprises a battery module, a three-phase PFC circuit, a first circuit, a second circuit, a first motor double-winding and a second motor double-winding; the circuit of the invention multiplexes a set of hardware equipment to a great extent, and realizes the control of the double-winding motor and the charging function of the vehicle-mounted charger; meanwhile, the control method of the invention can effectively balance the primary side capacity and the secondary side capacity when the current capacity of the power semiconductor is certain, thereby realizing the maximum power transmission and providing the charging capacity. The active power efficiency of the primary side and the secondary side is more than 90% and the reactive power ratio is more than 90% during operation.
Description
Technical Field
The invention belongs to the field of motor control and vehicle-mounted charging devices, and particularly relates to a control circuit and a control method of a three-phase PFC circuit cascaded double-winding motor.
Background
Along with the development and progress of the age, people gradually realize the importance of energy conservation, and new energy automobiles represented by electric automobiles take electric energy as main driving energy, so that adverse effects of greenhouse effect and other harmful gas emission on natural environment can be effectively relieved.
Batteries are an important factor restricting the development of electric vehicles. A common concern for users of electric vehicles today is the charging problem of the batteries.
The charging pile is off-vehicle charging equipment, is usually installed in a fixed operation place, can directly provide direct-current voltage for a battery pack of an electric automobile, and has the advantages of high charging power and high charging speed. However, the charging place is fixed, portability is poor, and an On-Board Charger (OBC) can provide a more convenient charging manner than a charging pile.
The vehicle-mounted charger requires a small volume and weight due to a limited space in the vehicle, and also requires a high charging power from the viewpoint of the user. Simultaneously, the cost of the hardware is compressed as much as possible while meeting the functional demands of users, and the cost is also an important problem to be considered by research developers.
The existing vehicle-mounted charger is required to be independently used as a module to be added into the hardware configuration of the electric vehicle, and related optimization and improvement schemes are also researched for the whole module, so that a novel vehicle-mounted charger alternative scheme is expected to be obtained for the discussion, the space limitation of the electric vehicle can be effectively solved, the number of vehicle-mounted charger pipe lines connected to the whole vehicle is reduced, the cost of the whole hardware is reduced, the power limitation of single-phase charging is broken through, the charging power is improved as much as possible by utilizing three-phase alternating current mains supply, and the charging time is shortened.
The technical scheme with the publication number of CN115230507A replicates the circuit topology of the current mainstream vehicle-mounted power supply module (On board Chager) in electrical principle, namely, the topology is forced to be subjected to OBC change (namely PFC and LLC modes) by using a double-winding motor topology through a large number of relays, and the capacity advantage of a sufficient double-winding motor cannot be utilized. Meanwhile, the use of a large number of (7) large-current relays can cause the increase of the cost and the reduction of the reliability of the whole product, which is not beneficial to the mass production of the product.
An EV Integrated Isolated DC Charger using a Six-Phase Synchronous Machine, sukhjit S Ghumman discloses a scheme using primary side id sinusoidal control, iq0 current control, secondary side not control, but the scheme has the following disadvantages:
1. limited by the switching frequency of the switching device (10 kHz-20 kHz), the electrical frequency of the sine wave control is limited to within 2kHz, and when the electrical frequency is small, a larger current amplitude is needed to bear the voltage rise requirement in the double three-phase winding, i.e. a large number of reactive components are generated, which ultimately affects the output of the active component (i.e. the charging power).
2. Only consider the boost charge-discharge function of DCDC, do not consider the actual conditions of three-phase charger (domestic slow charging stake), this proposal has integrated the three-phase PFC circuit that fills the stake must slowly.
3. The capacity of the double inverters in the double-winding topology is not reasonably distributed, so that the current imbalance of primary and secondary sides during operation can be caused, and the maximum power output capacity is affected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control circuit and a control method for a three-phase PFC circuit cascaded double-winding motor.
The aim of the invention is realized by the following technical scheme:
a three-phase PFC circuit cascaded two-winding motor control circuit comprising:
the power supply comprises a battery module, a three-phase PFC circuit, a first circuit, a second circuit, a first motor double-winding and a second motor double-winding; the positive electrode of the three-phase PFC circuit is connected with the positive electrode of the first circuit through the first switch, the negative electrode of the three-phase PFC circuit is connected with the negative electrode of the first circuit through the third switch, the positive electrode of the first circuit is also connected with the positive electrode of the battery module through the second switch, the negative electrode of the first circuit is also connected with the negative electrode of the battery module through the fourth switch, the positive electrode of the second circuit is connected with the positive electrode of the battery module, and the negative electrode of the second circuit is connected with the negative electrode of the battery module; the first circuit and the second circuit are composed of a capacitor and three-phase bridge arms, each phase is divided into an upper bridge arm and a lower bridge arm, and each bridge arm is formed by connecting a power switch tube and a freewheeling diode; the midpoint of the three-phase bridge arm of the first circuit is correspondingly connected to the three-phase winding of the double-winding of the first motor respectively, and the midpoint of the three-phase bridge arm of the second circuit is correspondingly connected to the three-phase winding of the double-winding of the second motor respectively;
the three-phase PFC circuit cascaded double-winding motor control circuit realizes two modes by controlling a first switch, a second switch, a third switch and a fourth switch; the battery module simultaneously drives the first circuit and the second circuit in a direct current mode, and the first circuit and the second circuit serve as motor control circuits and respectively drive the first motor double winding and the second motor double winding in a PWM mode;
the first switch and the third switch are closed, the second switch and the fourth switch are opened to be in a vehicle-mounted charger mode, at the moment, three-phase windings in the double windings of the first motor jointly form the primary side of the isolation transformer, and three-phase windings in the double windings of the second motor jointly form the secondary side of the isolation transformer; the first circuit and the second circuit are used as three-phase full-bridge inversion/rectification circuits to realize inversion of output voltage of the three-phase PFC circuit and rectification of high-frequency alternating current output by the isolation transformer; the boosting function of the isolation transformer module is realized by configuring the number of turns of the lead wires of the two groups of three-phase windings.
A control method of a three-phase PFC circuit cascade double-winding motor control circuit controls electric energy transmission of the three-phase PFC circuit cascade double-winding motor control circuit in a vehicle-mounted charger mode, comprising the following steps:
collecting d-axis current and output power feedback of a primary side and a secondary side of an isolation transformer;
acquiring a sine phase of a primary side current and a given value of a current amplitude based on the collected primary and secondary side d-axis currents of the isolation transformer and output power feedback, and further acquiring the given value of the primary side d-axis current;
the obtained primary side d-axis current given value is subjected to difference with the corresponding primary side d-axis current and then is sent to a PI controller and an SOGI double-integral resonance controller, and a primary side voltage instruction is obtained after summation;
based on the primary side voltage command and the secondary side voltage command, PWM waves are obtained through a carrier wave or space vector modulation method respectively and are input to the primary side and the secondary side of the isolation transformer, and the electric energy transmission of the three-phase PFC circuit cascade double-winding motor control circuit in the vehicle-mounted charger mode is controlled.
Further, the primary side current sine phase and the current amplitude given value are obtained based on the collected primary side d-axis current and the secondary side d-axis current of the isolation transformer and the output power feedback, and the primary side d-axis current given value is obtained specifically as follows:
after the difference between the d-axis current effective values of the primary side and the secondary side is input into a PI regulator, the hysteresis phase of the expected unit sinusoidal current is output, and the sinusoidal wave with the amplitude of 1 is output through a sinusoidal wave generator, so that the sinusoidal phase of the primary side current is obtained;
after feedback difference is made between the charge-discharge expected power setting and the secondary side output power, the primary side current amplitude given value is output through a PI controller;
and integrating the sine phase of the primary side current and the given value of the primary side current amplitude to obtain the given value of the primary side d-axis current.
Further, the secondary side voltage command is a fixed value.
A control device for a control circuit of a three-phase PFC circuit cascaded double-winding motor, comprising:
the data acquisition module is used for acquiring the primary side d-axis current and the secondary side d-axis current of the isolation transformer and feeding back the output power;
the current sinusoidal phase giving module is used for obtaining a primary current sinusoidal phase based on the collected primary and secondary d-axis currents of the isolation transformer;
the current amplitude given module is used for obtaining a current amplitude given value based on the collected d-axis currents of the primary side and the secondary side of the isolation transformer and the output power feedback;
the current inner loop adjusting module is used for making difference between the obtained primary side d-axis current given value and the corresponding primary side d-axis current, sending the difference to the PI controller and the SOGI double-integral resonance controller, and obtaining a primary side voltage instruction after summation;
the primary side wave generating module is used for obtaining PWM waves through a carrier wave or space vector modulation method based on a primary side voltage instruction and inputting the PWM waves to the primary side of the isolation transformer;
the secondary side wave generating module is used for obtaining PWM waves through a carrier wave or space vector modulation method based on a secondary side voltage instruction and inputting the PWM waves to the secondary side of the isolation transformer.
Further, the data acquisition module includes:
the mechanical system sampling module is used for sampling the current rotor position through the position sensor;
the primary side d-axis current sampling module is used for obtaining primary side d-axis current by carrying out abc-dq conversion on the three-phase current at the primary side output end of the isolation transformer and combining the current rotor position acquired by the mechanical system sampling module;
the secondary side d-axis current sampling module is used for obtaining secondary side d-axis current by carrying out abc-dq conversion on the three-phase current at the secondary side output end of the isolation transformer and combining the current rotor position acquired by the mechanical system sampling module;
the secondary side power calculation module is used for calculating active power P2 and reactive power Q2 of the secondary side after sampling three-phase current and three-phase voltage at the secondary side output end of the isolation transformer;
the primary side and secondary side current difference solving module is used for solving the difference between the primary side d-axis current and the secondary side d-axis current output by the primary side d-axis current sampling module and the secondary side d-axis current sampling module.
Further, the device also comprises a primary side power calculation module which is used for calculating active power P1 and reactive power Q1 of the primary side after sampling the three-phase current and the three-phase voltage of the primary side output end of the isolation transformer.
The beneficial effects of the invention are as follows:
(1) The circuit provided by the invention multiplexes a set of hardware equipment to a great extent, and simultaneously realizes the control of the double-winding motor and the charging function of the vehicle-mounted charger, thereby effectively saving the whole layout space.
(2) The circuit of the invention discards the possibility of a large number of relay changes and asymmetrical operation of the motor body by multiplexing hardware devices, simultaneously realizes motor control and battery charging requirements by adding a small amount of power switches and relay switches, greatly reduces cost expenditure on the whole and completely has the feasibility of implementing mass production.
(3) Compared with a commonly used vehicle-mounted charger in the market, the circuit topology of the double-winding motor is multiplexed to realize larger charging function power, and charging timeliness can be effectively improved.
(5) The three-phase PFC circuit has the advantages that the commercial power supply is three-phase alternating current, the module power capacity of the three-phase PFC circuit is larger, the power limit of a single-phase commercial car charger is broken through, larger charging power can be realized, and the charging time is greatly shortened.
(6) The control method of the invention can effectively balance the primary side capacity and the secondary side capacity when the current capacity of the power semiconductor is certain, thereby realizing the maximum power transmission and providing the charging capacity. The active power efficiency of the primary side and the secondary side is more than 90% and the reactive power ratio is more than 90% during operation.
Drawings
Fig. 1 is a topology diagram of a three-phase PFC circuit cascaded two-winding motor control circuit in a two-winding motor control mode;
fig. 2 is a topology diagram of a three-phase PFC circuit cascaded two-winding motor control circuit in an on-vehicle charger mode;
FIG. 3 is a schematic diagram of a relay switch control operating condition for two-mode switching;
fig. 4 is a flow chart of a control method of a control circuit of a cascaded two-winding motor of a three-phase PFC circuit according to the present invention;
FIG. 5 is a schematic diagram of the interior of a current sinusoidal phase given module;
FIG. 6 is a schematic diagram of the interior of a current magnitude given module;
FIG. 7 is a schematic diagram of the interior of the current inner loop regulation module;
fig. 8 is a waveform curve of the primary side active power P1 and the secondary side active power P2 when the given value is set to 100 kW;
fig. 9 is a waveform curve of the primary reactive power Q1 and the secondary reactive power Q2 when the given value is set to 100 kW;
fig. 10 is a waveform curve of the primary side d-axis current id1 and the secondary side d-axis current id2 when the given value is set to 100 kW.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
the invention relates to a three-phase PFC circuit cascade double-winding motor control circuit, as shown in figures 1 and 2, comprising:
the power supply comprises a battery module BAT, a three-phase PFC circuit, a first circuit, a second circuit, a first motor double winding and a second motor double winding; the first circuit and the second circuit have the same structure and are composed of a capacitor and a three-phase bridge arm; specifically, the first circuit is composed of a first capacitor C1 and a three-phase bridge arm, the upper end and the lower end of the first capacitor C1 are connected with the upper end and the lower end of the three-phase bridge arm, and the upper end and the lower end of the first capacitor C1 are respectively the anode and the cathode of the first circuit. Each phase of the three-phase bridge arm is divided into an upper bridge arm and a lower bridge arm, each bridge arm is formed by connecting a power switch tube and a freewheeling diode, 6 bridge arms respectively correspond to UT1 and UB1, VT1 and VB1, WT1 and WB1 blocks, a basic block UT1 is used as a U-phase upper bridge arm, a basic block UB1 is used as a U-phase lower bridge arm, and the two blocks are connected with each other; the middle point of the U-phase bridge arm is connected with one phase winding La1 of the double windings 1 of the first motor. The basic block VT1 is used as a V-phase upper bridge arm, the basic block VB1 is used as a V-phase lower bridge arm, the two blocks are mutually connected, and the midpoint of the V-phase bridge arm is connected with one phase winding Lb1 of the first motor double winding 1. The basic block WT1 is used as a W-phase upper bridge arm, the basic block WB1 is used as a W-phase lower bridge arm, the two blocks are connected with each other, the midpoint of the W-phase bridge arm is connected with one phase winding Lc1 of the first motor double winding 1, and the three-phase windings La1, lb1 and Lc1 have the same electrical resistance and inductance characteristics.
Similarly, the second circuit is composed of a second capacitor C2 and a three-phase bridge arm, the upper end and the lower end of the second capacitor C2 are connected with the upper end and the lower end of the three-phase bridge arm, and the upper end and the lower end of the second capacitor C2 are respectively the anode and the cathode of the second circuit. Each phase of the three-phase bridge arm is divided into an upper bridge arm and a lower bridge arm, each bridge arm is formed by connecting a power switch tube and a freewheeling diode, 6 bridge arms respectively correspond to UT2 and UB2, VT2 and VB2, WT2 and WB2 blocks, a basic block UT2 is used as a U-phase upper bridge arm, a basic block UB2 is used as a U-phase lower bridge arm, and the two blocks are connected with each other; the middle point of the U-phase bridge arm is connected with one phase winding La2 of the second motor double-winding 2. The basic block VT2 is used as a V-phase upper bridge arm, the basic block VB2 is used as a V-phase lower bridge arm, the two blocks are mutually connected, and the midpoint of the V-phase bridge arm is connected with one phase winding Lb2 of the second motor double winding 2. The basic block WT2 is used as a W-phase upper bridge arm, the basic block WB2 is used as a W-phase lower bridge arm, the two blocks are mutually connected, and the midpoint of the W-phase bridge arm is connected with one phase winding Lc2 of the second motor double winding 2. The three-phase windings La2, lb2, lc2 have the same electrical resistance characteristics. In the double windings of the first motor and the second motor, three-phase windings are connected in a star connection mode.
The positive electrode (HV+) of the three-phase PFC circuit is connected with the positive electrode of the first circuit through a first switch K1, the negative electrode (HV-) of the three-phase PFC circuit is connected with the negative electrode of the first circuit through a third switch K3, the positive electrode of the first circuit is also connected with the positive electrode of the battery module BAT through a second switch K2, the negative electrode of the first circuit is also connected with the negative electrode of the battery module BAT through a fourth switch K4, the positive electrode of the second circuit is connected with the positive electrode of the battery module BAT, and the negative electrode of the second circuit is connected with the negative electrode of the battery module BAT;
the control circuit of the three-phase PFC circuit cascaded double-winding motor realizes two modes by controlling a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4, and the switching of the two modes is shown in figure 3; the first switch K1 and the third switch K3 are opened, the second switch K2 and the fourth switch K4 are closed, and the first switch K3 and the third switch K3 are in a double-winding motor control mode, as shown in fig. 1, the battery module BAT drives the first circuit and the second circuit simultaneously, and the first circuit and the second circuit serve as motor control circuits and respectively output PWM (Pulse WidthModulation ) waves simultaneously to drive the first motor double-winding and the second motor double-winding;
closing the first switch K1 and the third switch K3, and opening the second switch K2 and the fourth switch K4 are in a vehicle-mounted charger mode, as shown in fig. 2, wherein three-phase windings in the double windings of the first motor jointly form a primary side of the isolation transformer, and three-phase windings in the double windings of the second motor jointly form a secondary side of the isolation transformer; the first circuit and the second circuit are used as three-phase full-bridge inversion/rectification circuits to realize inversion of output voltage of the three-phase PFC circuit and rectification of high-frequency alternating current output by the isolation transformer; the boosting function of the isolation transformer module is realized by configuring the number of turns of the lead wires of the two groups of three-phase windings.
The method directly discards the mode of copying the mainstream OBC topology, changes the PFC+LLC mode into the DAB mode of the PFC+double-winding motor, uses fewer relays in number, is simpler and more convenient to operate, and effectively saves the whole layout space and reduces the cost.
The first switch K1 and the third switch K3, and the second switch K2 and the fourth switch K4 are opened in the circuit of the present invention, and may be replaced by any device having a switching property.
Under the topology of the three-phase PFC cascade double-three-phase winding motor control circuit, the integrated driving function and the bidirectional charging and discharging function can be effectively realized without increasing the cost. However, all the current schemes do not consider the capacity equalization problem of the double three-phase motor inverter (primary side and secondary side of the isolation transformer), namely the asymmetrical operation of the two three-phase inverters is possible to occur during the transmission of charging power. The current tolerance of the power semiconductor is limited, so that the maximum capacity capability of the two inverters is often not obtained, and the capacity waste or the charge and discharge power is not expected. Therefore, the invention also provides a control method and a control device for the control circuit of the three-phase PFC circuit cascaded double-winding motor, which can realize accurate power tracking, and effectively perform balanced control on the current of the double inverters, so that the maximum current output in the double inverters reaches the minimum value under the same output power. In other words, the method and the device can ensure that the topology outputs the current maximum charge and discharge power. Specifically, the control method of the three-phase PFC circuit cascade double-winding motor control circuit disclosed by the invention is used for controlling the electric energy transmission of the three-phase PFC circuit cascade double-winding motor control circuit in a vehicle-mounted charger mode and specifically comprises the following steps of:
step one: collecting d-axis current and output power feedback of a primary side and a secondary side of an isolation transformer;
step two: acquiring a sine phase of a primary side current and a given value of a current amplitude based on the collected primary and secondary side d-axis currents of the isolation transformer and output power feedback, and further acquiring the given value of the primary side d-axis current; comprises the following substeps:
(2.1) inputting the difference between the d-axis current effective values of the primary side and the secondary side into a PI regulator, outputting a hysteresis phase for obtaining a sine current of a desired unit, and outputting a sine wave with the amplitude of 1 through a sine wave generator to obtain a sine phase given to the primary side current; the capacity balance of the primary side and the secondary side (the inverter 1 and the inverter 2) of the isolation transformer is kept through the difference value of the primary side and the secondary side, and the maximum transmission power capacity of the inverter power semiconductor current capacity is achieved at a certain time.
(2.2) obtaining a primary side current id1Ref amplitude given value through the difference value of the expected power and the actual power, and realizing accurate power tracking: after feedback difference is made between the charge-discharge expected power setting and the secondary side output power, the primary side current amplitude given value is output through a PI controller;
and (2.3) integrating the sine phase of the primary side current and the given value of the primary side current amplitude to obtain the given value of the primary side d-axis current.
Step three: the obtained primary side d-axis current given value is subjected to difference with the corresponding primary side d-axis current and then is sent to a PI controller and an SOGI double-integral resonance controller, and a primary side voltage instruction is obtained after summation;
step four: based on the primary side voltage command and the secondary side voltage command, the secondary side voltage command is a fixed value; PWM waves are obtained through a carrier wave or space vector modulation method respectively and are input to the primary side and the secondary side of the isolation transformer;
the steps are circularly executed to control the electric energy transmission of the three-phase PFC circuit cascaded double-winding motor control circuit in a vehicle-mounted charger mode, and the current of the double inverters is effectively balanced and controlled while accurate power tracking is realized through decoupling control of sine phases of primary currents and given values of current amplitude values, so that the maximum current output in the double inverters reaches the minimum value under the same output power.
Fig. 8 is a waveform curve of the primary side active power P1 and the secondary side active power P2 when the given value is set to 100kW, and it can be seen that the primary side active power and the secondary side active power are basically consistent, and the balanced distribution is achieved, and the normal transmission of power and the normal efficiency are achieved.
Fig. 9 is a waveform curve of the primary reactive power Q1 and the secondary reactive power Q2 when the given value is set to 100kW, and it is seen that the primary reactive power and the secondary reactive power are substantially identical, and the balanced distribution is achieved.
Fig. 10 is a waveform curve of the primary side d-axis current id1 and the secondary side d-axis current id2 when the given value is set to 100kW, and it is seen that the primary side d-axis current and the secondary side d-axis current are substantially identical, and the balanced distribution is achieved.
Corresponding to the control method of the three-phase PFC circuit cascade double-winding motor control circuit, the invention also provides a control device of the three-phase PFC circuit cascade double-winding motor control circuit, as shown in fig. 4, comprising:
the data acquisition module is used for acquiring the primary side d-axis current and the secondary side d-axis current of the isolation transformer and feeding back the output power; wherein, the data acquisition module includes:
the mechanical system sampling module is used for sampling the current rotor position through the position sensor;
the primary side d-axis current sampling module is used for obtaining primary side d-axis current id1 by carrying out abc-dq conversion on the three-phase current at the primary side (inverter 1) output end of the isolation transformer and combining the current rotor position acquired by the mechanical system sampling module;
the primary side power calculation module is used for calculating active power P1 and reactive power Q1 of the primary side after sampling three-phase current and three-phase voltage of the primary side output end of the isolation transformer and judging the running condition of the whole machine.
The secondary side d-axis current sampling module is used for obtaining secondary side d-axis current id2 by carrying out abc-dq conversion on the three-phase current at the secondary side output end of the isolation transformer and combining the current rotor position acquired by the mechanical system sampling module;
the secondary side power calculation module is used for calculating active power P2 and reactive power Q2 of the secondary side after sampling three-phase current and three-phase voltage at the secondary side output end of the isolation transformer;
the primary side and secondary side current difference solving module is used for solving the difference between the primary side d-axis current and the secondary side d-axis current output by the primary side d-axis current sampling module and the secondary side d-axis current sampling module.
The current sine phase given module is input as the difference (variable name: gainDelta) between the effective values of the primary side d-axis current and the secondary side d-axis current output by the primary side current difference module, the internal principle is shown in fig. 5, gainDelta outputs the hysteresis phase of the desired unit sine current after passing through the PI regulator, and the hysteresis phase is input to the sine wave generator, and the internal function of the generator is as follows:
where fc is the current frequency (in Hz) and t is the time count. The generator outputs a sine wave unitsine wave with the amplitude of 1, namely the sine phase of the primary current is obtained. The function of the module is to keep the working current of the primary side and the secondary side balanced, so that the average distribution of the capacity is achieved.
The current amplitude setting module inputs a manually set charge-discharge expected power setting (positive number represents primary side to secondary side charging, negative number represents secondary side to primary side discharging) and secondary side output power feedback (secondary side active power P2), outputs a current amplitude set value, and outputs the current amplitude set value through a PI controller after the charge-discharge expected power and the secondary side active power P2 are differenced, wherein the internal principle is as shown in figure 6.
The current inner loop regulating module inputs a primary side d-axis current given value id1Ref and a primary side d-axis current id1 output by the primary side d-axis current sampling module, the internal principle is as shown in fig. 7, error signals respectively enter a PI controller (Kp is proportional gain, ki is integral gain, and integrator 3 is an integrator in the PI controller) and an SOGI double-integral resonance controller after the difference between id1Ref and id1 is made, and a primary side voltage command vd1 is obtained after summation.
The primary side wave generating module is used for setting d-axis voltage as vd1, q-axis voltage and 0-axis voltage as 0 based on a primary voltage command vd1, obtaining three-phase voltage given after dq-abc conversion, obtaining PWM waves through a carrier wave or space vector modulation method, and inputting the PWM waves to the primary side of the isolation transformer;
the secondary side wave generating module is used for obtaining PWM waves through a carrier wave or space vector modulation method based on a secondary side voltage instruction (fixed value) and inputting the PWM waves to the secondary side of the isolation transformer.
The invention can support multiplexing circuit topologies of alternating current charge and discharge (ACDC), direct current charge and discharge (DCDC) and motor drive.
The present invention is not limited to the above-described embodiments, and all other examples obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
Claims (7)
1. A three-phase PFC circuit cascaded two-winding motor control circuit, comprising:
the power supply comprises a battery module, a three-phase PFC circuit, a first circuit, a second circuit, a first motor double-winding and a second motor double-winding; the positive electrode of the three-phase PFC circuit is connected with the positive electrode of the first circuit through the first switch, the negative electrode of the three-phase PFC circuit is connected with the negative electrode of the first circuit through the third switch, the positive electrode of the first circuit is also connected with the positive electrode of the battery module through the second switch, the negative electrode of the first circuit is also connected with the negative electrode of the battery module through the fourth switch, the positive electrode of the second circuit is connected with the positive electrode of the battery module, and the negative electrode of the second circuit is connected with the negative electrode of the battery module; the first circuit and the second circuit are composed of a capacitor and three-phase bridge arms, each phase is divided into an upper bridge arm and a lower bridge arm, and each bridge arm is formed by connecting a power switch tube and a freewheeling diode; the midpoint of the three-phase bridge arm of the first circuit is correspondingly connected to the three-phase winding of the double-winding of the first motor respectively, and the midpoint of the three-phase bridge arm of the second circuit is correspondingly connected to the three-phase winding of the double-winding of the second motor respectively;
the three-phase PFC circuit cascaded double-winding motor control circuit realizes two modes by controlling a first switch, a second switch, a third switch and a fourth switch; the battery module simultaneously drives the first circuit and the second circuit in a direct current mode, and the first circuit and the second circuit serve as motor control circuits and respectively drive the first motor double winding and the second motor double winding in a PWM mode;
the first switch and the third switch are closed, the second switch and the fourth switch are opened to be in a vehicle-mounted charger mode, at the moment, three-phase windings in the double windings of the first motor jointly form the primary side of the isolation transformer, and three-phase windings in the double windings of the second motor jointly form the secondary side of the isolation transformer; the first circuit and the second circuit are used as three-phase full-bridge inversion/rectification circuits to realize inversion of output voltage of the three-phase PFC circuit and rectification of high-frequency alternating current output by the isolation transformer; the boosting function of the isolation transformer module is realized by configuring the number of turns of the lead wires of the two groups of three-phase windings.
2. A control method of a three-phase PFC circuit cascaded double-winding motor control circuit, characterized by controlling the power transmission of the three-phase PFC circuit cascaded double-winding motor control circuit according to claim 1 in a vehicle-mounted charger mode, comprising the steps of:
collecting d-axis current and output power feedback of a primary side and a secondary side of an isolation transformer;
acquiring a sine phase of a primary side current and a given value of a current amplitude based on the collected primary and secondary side d-axis currents of the isolation transformer and output power feedback, and further acquiring the given value of the primary side d-axis current;
the obtained primary side d-axis current given value is subjected to difference with the corresponding primary side d-axis current and then is sent to a PI controller and an SOGI double-integral resonance controller, and a primary side voltage instruction is obtained after summation;
based on the primary side voltage command and the secondary side voltage command, PWM waves are obtained through a carrier wave or space vector modulation method respectively and are input to the primary side and the secondary side of the isolation transformer, and the electric energy transmission of the three-phase PFC circuit cascade double-winding motor control circuit in the vehicle-mounted charger mode is controlled.
3. The method according to claim 2, wherein the acquiring the sinusoidal phase of the primary side current and the given value of the current amplitude based on the collected primary and secondary side d-axis currents and the output power feedback of the isolation transformer, and further acquiring the given value of the primary side d-axis current is specifically:
after the difference between the d-axis current effective values of the primary side and the secondary side is input into a PI regulator, the hysteresis phase of the expected unit sinusoidal current is output, and the sinusoidal wave with the amplitude of 1 is output through a sinusoidal wave generator, so that the sinusoidal phase of the primary side current is obtained;
after feedback difference is made between the charge-discharge expected power setting and the secondary side output power, the primary side current amplitude given value is output through a PI controller;
and integrating the sine phase of the primary side current with the given value of the primary side current amplitude to obtain the given value of the primary side d-axis current.
4. The method of claim 2, wherein the secondary side voltage command is a fixed value.
5. A control device for a control circuit of a three-phase PFC circuit cascaded double-winding motor, comprising:
the data acquisition module is used for acquiring the primary side d-axis current and the secondary side d-axis current of the isolation transformer and feeding back the output power;
the current sinusoidal phase giving module is used for obtaining a primary current sinusoidal phase based on the collected primary and secondary d-axis currents of the isolation transformer;
the current amplitude given module is used for obtaining a current amplitude given value based on the collected d-axis currents of the primary side and the secondary side of the isolation transformer and the output power feedback;
the current inner loop adjusting module is used for making difference between the obtained primary side d-axis current given value and the corresponding primary side d-axis current, sending the difference to the PI controller and the SOGI double-integral resonance controller, and obtaining a primary side voltage instruction after summation;
the primary side wave generating module is used for obtaining PWM waves through a carrier wave or space vector modulation method based on a primary side voltage instruction and inputting the PWM waves to the primary side of the isolation transformer;
the secondary side wave generating module is used for obtaining PWM waves through a carrier wave or space vector modulation method based on a secondary side voltage instruction and inputting the PWM waves to the secondary side of the isolation transformer.
6. The apparatus of claim 5, wherein the data acquisition module comprises:
the mechanical system sampling module is used for sampling the current rotor position through the position sensor;
the primary side d-axis current sampling module is used for obtaining primary side d-axis current by carrying out abc-dq conversion on the three-phase current at the primary side output end of the isolation transformer and combining the current rotor position acquired by the mechanical system sampling module;
the secondary side d-axis current sampling module is used for obtaining secondary side d-axis current by carrying out abc-dq conversion on the three-phase current at the secondary side output end of the isolation transformer and combining the current rotor position acquired by the mechanical system sampling module;
the secondary side power calculation module is used for calculating active power P2 and reactive power Q2 of the secondary side after sampling three-phase current and three-phase voltage at the secondary side output end of the isolation transformer;
the primary side and secondary side current difference solving module is used for solving the difference between the primary side d-axis current and the secondary side d-axis current output by the primary side d-axis current sampling module and the secondary side d-axis current sampling module.
7. The device of claim 6, further comprising a primary power calculation module for calculating the active power P1 and the reactive power Q1 of the primary by sampling the three-phase current and the three-phase voltage at the primary output of the isolation transformer.
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| US20170222488A1 (en) * | 2014-08-11 | 2017-08-03 | Auckland Uniservices Limited | Resonant frequency compensation |
| US20180115180A1 (en) * | 2016-10-26 | 2018-04-26 | Hyundai Motor Company | Charging system using wound rotor synchronous motor |
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