CN113547908B - Hybrid power system and control method thereof - Google Patents

Hybrid power system and control method thereof Download PDF

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Publication number
CN113547908B
CN113547908B CN202111032072.0A CN202111032072A CN113547908B CN 113547908 B CN113547908 B CN 113547908B CN 202111032072 A CN202111032072 A CN 202111032072A CN 113547908 B CN113547908 B CN 113547908B
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winding
power
engine
load
energy
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CN113547908A (en
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孔铭
贺忠敏
赵探探
王雪帆
徐海波
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East Group Co Ltd
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East Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/46—Series type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/28—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the electric energy storing means, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/50—Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/08—Electric propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2530/00—Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
    • B60W2530/10—Weight
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2552/00—Input parameters relating to infrastructure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/08—Electric propulsion units
    • B60W2710/081—Speed
    • 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
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The invention discloses a hybrid power system and a control method thereof. The brushless doubly-fed motor is adopted to replace a permanent magnet motor, and the power winding and the control winding of the brushless doubly-fed motor can simultaneously perform variable frequency speed regulation, so that the speed regulation range is wider; the super capacitor and the storage battery are adopted to supply power simultaneously, and both discharge performance and storage capacity can be ensured; when a problem occurs in one side of the winding, the winding can be opened, so that the winding is controlled by an asynchronous motor, and the safety of the system is improved; because of the existence of the super capacitor, the power winding is a high-voltage winding, and the circuit loss can be reduced; the brushless doubly-fed motor is a double-port motor, the control winding and the power winding can be controlled simultaneously, the control scheme is various, and the power and the endurance can be better optimized.

Description

Hybrid power system and control method thereof
Technical Field
The invention belongs to the technical field of vehicle power systems, and particularly relates to a hybrid power system and a control method thereof.
Background
With the popularization of the green life concept, the types of vehicles which apply pure electric or other new energy power worldwide are increasing. The vehicles such as buses and taxis can well apply new energy power. Because of the large difference between the total weight of the vehicle and the operation condition, the transportation type heavy vehicle is still in the preliminary stage by using the pure electric technology. There are three types of power schemes in urban transportation vehicles. Firstly, the heavy vehicle with large total mass or long operation mileage adopts the traditional scheme; the second is pure electric power, which is applied to vehicles with smaller total mass or short operation mileage; the third category is hybrid power, and the total mass and the operation mileage are moderate.
At present, the hybrid power mainly adopts a permanent magnet synchronous motor, and has the advantages of high efficiency and high power density, but has the following technical defects:
1) The magnetic circuit structure and design calculation are complex, and the material processing difficulty is high;
2) Constant voltage control problem, difficult field weakening at high speed;
3) The heating is serious during high-speed operation, and the permanent magnet is easy to lose magnetism;
4) The cost problem, the price of the permanent magnet material and the processing difficulty, and the total cost is improved.
Disclosure of Invention
The invention provides a hybrid power system and a control method thereof, which can solve or at least partially solve the technical problems.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a hybrid power system is provided, comprising an engine, a brushless doubly-fed motor, and a frequency conversion device, the engine being connected to a load, the brushless doubly-fed motor being indirectly connected to the load by connecting the engine in series;
the brushless double-fed motor comprises a power winding and a control winding, wherein the power winding is connected with a super capacitor through a first bridge circuit, and the control winding is connected with a storage battery through a second bridge circuit;
the frequency conversion device is used for adjusting the output frequency of the power winding and the control winding.
Optionally, the method comprises:
and the charging device is used for charging the super capacitor and the storage battery through the charging pile.
Optionally, the method comprises:
and the switching device is respectively connected with the power winding and the control winding and is used for switching the failed winding into an open circuit when one winding of the power winding and the control winding fails.
In a second aspect, there is provided a control method applied to a hybrid system as described above, including:
when the speed of the vehicle changes rapidly, the brushless double-fed motor is in a working state, and energy is fed in or fed out through the power winding.
Optionally, the method comprises:
under the idle working condition, closing the engine; the energy feed-in and feed-out control of starting and decelerating is performed by a brushless double-fed motor.
Optionally, the method comprises:
when the brake is carried out in a heavy load and the motor descends, the brushless double-fed motor is in a working state, and the power winding and the control winding feed out or feed in energy at the same time.
Optionally, the method comprises:
when one of the power winding and the control winding fails, the failed winding is switched to an open circuit.
Optionally, the method comprises:
under the working condition of small load, if the energy storage system is sufficient in energy, the engine is closed; the brushless double-fed motor is in a working state, and the power winding and the control winding feed out energy to a load at the same time;
if the energy storage system is insufficient in energy, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless double-fed motor is in a working state, and the feeding-in and feeding-out of energy of the power winding and the control winding are determined according to the condition of a load.
Optionally, the method comprises:
under the medium load working condition, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless double-fed motor is in a working state, and the feeding-in and feeding-out of energy of the power winding and the control winding are determined according to the condition of a load.
Optionally, the method comprises:
under the working condition of large load or full load, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless doubly-fed motor is in an operating state, and the power winding, the control winding and the motor all feed energy to the load.
Optionally, the method comprises:
under the acceleration working condition, the brushless double-fed motor is in a working state, and the power winding feeds out energy to the load.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the hybrid power system and the control method thereof provided by the embodiment of the invention, the brushless doubly-fed motor is adopted to replace the permanent magnet synchronous motor in the hybrid power system, and the power winding and the control winding of the brushless doubly-fed motor can be used for simultaneously carrying out variable frequency speed regulation, so that the speed regulation range is wider; the design scheme is simpler to process, the material is a conventional motor material, and the process universality is strong; the problem of high-temperature demagnetization of the permanent magnet does not exist, and the overload capacity is very strong; the super capacitor and the storage battery are adopted to supply power simultaneously, and both discharge performance and storage capacity can be ensured; when a problem occurs in one side of the winding, the winding can be opened, so that the winding is controlled by an asynchronous motor, and the safety of the system is improved; because of the existence of the super capacitor, the power winding is a high-voltage winding, and the circuit loss can be reduced; the brushless doubly-fed motor is a double-port motor, the control winding and the power winding can be controlled simultaneously, the control scheme is various, and the power and the endurance can be better optimized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the scope of the invention.
Fig. 1 and fig. 2 are block diagrams of a hybrid power system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Please refer to fig. 1 and 2.
The embodiment provides a hybrid power system, which comprises an engine, a brushless double-fed motor and a frequency conversion device, wherein the engine is connected with a load, and the brushless double-fed motor is indirectly connected with the load through a series engine.
The brushless double-fed motor comprises a power winding and a control winding, wherein the power winding is connected with a super capacitor through a first bridge circuit, and the control winding is connected with a storage battery through a second bridge circuit.
The frequency conversion device is used for adjusting the output frequency of the power winding and the control winding.
The power winding and the control winding can be subjected to variable frequency speed regulation simultaneously through the frequency conversion device. In particular, according to the brushless doubly-fed motor rotational speed expressionIt is known that the rotational speed range of the motor is determined by the output frequencies of the power winding and the control winding, thus increasing the speed regulation range. Wherein omega r 、ω p 、ω c 、p p And p c The motor rotating speed, the power winding angular frequency, the control winding angular frequency, the power winding pole pair number and the control winding pole pair number are respectively represented.
Further, the hybrid power system further comprises a charging device for charging the super capacitor and the storage battery through the charging pile. The super capacitor and the storage battery are adopted to supply power simultaneously, and the discharging performance and the storage capacity can be ensured. Specifically, the voltage corresponding to the super capacitor is high voltage, so that the circuit loss can be reduced; the voltage of the battery is low. Thus, the first bridge circuit may be a high voltage three phase bridge circuit and the second bridge circuit may be a low voltage three phase bridge circuit. The super capacitor feeds in and feeds out energy through a high-voltage three-phase bridge circuit, and the storage battery feeds in and feeds out energy through a low-voltage three-phase bridge circuit.
Further, the hybrid power system further comprises a switching device, wherein the switching device is respectively connected with the power winding and the control winding and is used for switching the failed winding into an open circuit when one of the power winding and the control winding fails, so that the failed winding is controlled by the asynchronous motor, and the system safety is improved.
In the hybrid power system provided by the embodiment, a brushless doubly-fed motor is adopted to replace a permanent magnet synchronous motor, and a power winding and a control winding of the brushless doubly-fed motor can simultaneously perform variable frequency speed regulation, so that the speed regulation range is wider; the design scheme is simpler to process, the material is a conventional motor material, and the process universality is strong; the problem of high-temperature demagnetization of the permanent magnet does not exist, and the overload capacity is very strong; the super capacitor and the storage battery are adopted to supply power simultaneously, and both discharge performance and storage capacity can be ensured; when a problem occurs in one side of the winding, the winding can be opened, so that the winding is controlled by an asynchronous motor, and the safety of the system is improved; because of the existence of the super capacitor, the power winding is a high-voltage winding, and the circuit loss can be reduced; the brushless doubly-fed motor is a double-port motor, the control winding and the power winding can be controlled simultaneously, the control scheme is various, and the power and the endurance can be better optimized.
In another embodiment of the present application, there is also provided a control method applied to the above hybrid power system, including the following control steps:
s1, when the speed of the vehicle changes rapidly, the brushless double-fed motor is in a working state, and energy can be fed in or fed out through the super capacitor of the power winding loop, so that the system has stronger discharge performance, and the maneuverability of the vehicle is improved.
S2, closing the engine under the idle working condition; the brushless double-fed motor is used for starting and decelerating energy feed-in and feed-out control, and the energy can be mainly derived from the super capacitor.
And S3, when the brake is carried out in a heavy load and the motor descends, the brushless double-fed motor is in a working state, the power winding and the control winding feed out energy simultaneously, larger braking torque can be achieved, and the energy can be recovered (fed in).
S4, when one of the power winding and the control winding fails, the failed winding is switched to be open circuit, so that the asynchronous motor is controlled, and the system safety is improved.
Further, the control method provided in this embodiment further includes the following control steps:
s5, under the working condition of small load, if the energy storage system is sufficient in energy, the engine is closed; the brushless double-fed motor is in a working state, the power winding feeds energy to the load, and the energy mainly comes from the super capacitor;
if the energy storage system is insufficient in energy, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless double-fed motor is in a working state, and the feeding-in and feeding-out of energy of the power winding and the control winding are determined according to the condition of a load.
S6, under the medium load working condition, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless double-fed motor is in a working state, and the feeding-in and feeding-out of energy of the power winding and the control winding are determined according to the condition of a load.
S7, under the working condition of heavy load or full load, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless doubly-fed motor is in an operating state, and the power winding, the control winding and the motor all feed energy to the load.
And S8, under the acceleration working condition, the brushless double-fed motor is in a working state, and the power winding feeds out energy to the load.
It should be noted that, the small load, the medium load and the large load represent different load ranges respectively, and the whole load range can be divided into three ranges according to actual needs: small load, medium load and large load.
According to the control method provided by the embodiment of the invention, the power winding and the control winding of the brushless doubly-fed motor can simultaneously perform variable frequency speed regulation, and the speed regulation range is wider; the super capacitor and the storage battery are adopted to supply power simultaneously, and both discharge performance and storage capacity can be ensured; when a problem occurs in one side winding, the winding can be opened, so that the asynchronous motor is controlled, and the system safety is improved.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (1)

1. A control method of a hybrid power system is characterized in that,
the hybrid power system comprises an engine, a brushless double-fed motor and a frequency conversion device, wherein the engine is connected with a load, and the brushless double-fed motor is indirectly connected with the load by connecting the engine in series;
the brushless double-fed motor comprises a power winding and a control winding, wherein the power winding is connected with a super capacitor through a first bridge circuit, and the control winding is connected with a storage battery through a second bridge circuit; the first bridge circuit is a high-voltage three-phase bridge circuit, and the second bridge circuit is a low-voltage three-phase bridge circuit;
the frequency conversion device is used for adjusting the output frequency of the power winding and the control winding;
the switching device is respectively connected with the power winding and the control winding and is used for switching the failed winding into an open circuit when one of the power winding and the control winding fails;
the control method comprises the following steps:
when the speed of the vehicle changes rapidly, the brushless double-fed motor is in a working state, and energy is fed in or fed out through the power winding;
when one of the power winding and the control winding fails, switching the failed winding to an open circuit;
under the idle working condition, closing the engine; the energy feed-in and feed-out control of starting and decelerating is carried out through a brushless double-fed motor;
when the heavy load brakes and descends, the brushless double-fed motor is in a working state, and the power winding and the control winding feed out or feed in energy at the same time;
under the working condition of small load, if the energy storage system is sufficient in energy, the engine is closed; the brushless double-fed motor is in a working state, and the power winding and the control winding feed out energy to a load at the same time;
if the energy storage system is insufficient in energy, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless double-fed motor is in a working state, and the feeding-in and feeding-out of energy of the power winding and the control winding are determined according to the condition of a load;
under the medium load working condition, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless double-fed motor is in a working state, and the feeding-in and feeding-out of energy of the power winding and the control winding are determined according to the condition of a load;
under the working condition of large load or full load, starting the engine, and enabling the engine to operate in a working interval with optimal fuel economy; the brushless doubly-fed motor is in an operating state, and the power winding, the control winding and the motor all feed energy to the load.
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