CN113852318B - New energy power generation direct-drive system - Google Patents
New energy power generation direct-drive system Download PDFInfo
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- CN113852318B CN113852318B CN202111050771.8A CN202111050771A CN113852318B CN 113852318 B CN113852318 B CN 113852318B CN 202111050771 A CN202111050771 A CN 202111050771A CN 113852318 B CN113852318 B CN 113852318B
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- 238000010248 power generation Methods 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 claims description 29
- 230000009466 transformation Effects 0.000 claims description 29
- 238000004146 energy storage Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000004907 flux Effects 0.000 claims description 14
- 230000003068 static effect Effects 0.000 claims description 12
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 4
- 230000001131 transforming effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/54—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors
- H02P1/58—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/34—Arrangements for starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
- H02P5/50—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another by comparing electrical values representing the speeds
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
- H02S10/12—Hybrid wind-PV energy systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/20—Systems characterised by their energy storage means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention belongs to an electric drive system, and provides a new energy power generation direct drive system which aims to solve the problems that a photovoltaic power generation system and a wind power generation system are both intermittent power generation and cannot independently supply power to a continuously running load and are difficult to dissolve nearby.
Description
Technical Field
The invention belongs to an electric drive system, and particularly relates to a new energy power generation direct drive system.
Background
The photovoltaic power generation system is a power generation system that directly converts solar energy into electric energy using a solar cell. The system mainly comprises a photovoltaic module, a combiner box, a direct current cabinet, an alternating current power distribution cabinet, an inverter, an energy storage system, a step-up transformer, high-voltage switch equipment, a communication and monitoring system and the like. The device has the characteristics of high reliability, long service life, no environmental pollution, independent power generation and grid-connected operation. The wind power generation system utilizes wind power to drive windmill blades to rotate, then the rotation speed is increased through a speed increaser to promote a generator to generate electricity, the blades are mainly composed of a machine head, a rotator, a tail wing and blades, the blades are used for receiving the wind power and converting the wind power into electric energy through the machine head, the tail wing enables the blades to always face the direction of incoming wind so as to obtain maximum wind energy, the rotator can enable the machine head to flexibly rotate to achieve the function of adjusting the direction of the tail wing, a rotor of the machine head is a permanent magnet, a stator winding cuts magnetic force lines to generate electric energy, the wind power generator outputs alternating current with 13-25V, the alternating current is required to be rectified by a charger, then the accumulator jar is charged, the electric energy generated by the wind power generator is converted into chemical energy, and then an inverter power source with a protection circuit is used for converting the chemical energy in the accumulator jar into alternating current, and stable use can be ensured.
For new energy power generation systems such as photovoltaic power generation systems or wind power generation systems, because both photovoltaic power generation and wind power generation systems are intermittent power generation systems, power cannot be independently provided for a driving system, and the system is generally integrated into a public network system. For the photovoltaic power generation system and the wind power generation system which run in the isolated network, because the photovoltaic power generation and the wind power generation are intermittent power generation and are limited by natural environment and weather, the power supply is unstable, and the power supply can not independently supply power to continuously running loads, and the photovoltaic power generation system and the wind power generation system are generally used for lighting and the like. However, for large isolated grid operation photovoltaic power generation systems and wind power generation systems, how to get up nearby becomes a key problem.
Disclosure of Invention
The invention provides a new energy power generation direct-drive system, which aims to solve the technical problems that the existing photovoltaic power generation system and wind power generation system are both intermittent power generation and limited by natural environment and weather, a power supply is unstable and cannot independently supply power to continuously running loads, and particularly the photovoltaic power generation system and the wind power generation system running in a large isolated grid are difficult to dissolve nearby.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the new energy power generation direct-drive system is characterized by comprising an electric quantity management system, a step-up transformer, a frequency converter, a first motor, a second motor, a gearbox, a control system, and a photovoltaic power generation system and/or a wind power generation system;
the electric quantity management system is respectively connected with the photovoltaic power generation system and/or the wind power generation system and is used for adjusting the electric energy management of the photovoltaic power generation system and/or the wind power generation system;
the output end of the photovoltaic power generation system and/or the output end of the wind power generation system are/is connected with the input end of the step-up transformer, and the output end of the step-up transformer is connected with the input end of the frequency converter;
the first motor is connected with the output end of the frequency converter, the second motor is driven by an external power grid, the first motor is connected with the second motor through a coupler, and the output end of the second motor is connected with an external load through a gearbox;
the control system is respectively connected with the electric quantity management system and the frequency converter and is used for controlling the output of the frequency converter according to a control signal sent by the electric quantity management system;
the first motor and the second motor are started by the following method:
s1, starting a second motor
The first motor and the second motor are disconnected, and the second motor is started;
s2 starting the first motor
S2.1, carrying out two-phase stationary coordinate conversion on three-phase stator current of a first motor to obtain corresponding current signals under a two-phase stationary conversion coordinate system, and then carrying out two-phase rotating coordinate conversion to obtain corresponding current signals under the two-phase rotating coordinate system; the corresponding current signals under the two-phase rotation coordinate system are respectively excitation current and torque current;
s2.2, comparing the exciting current and the torque current obtained in the step S1 with a preset exciting current and a preset torque current respectively, and outputting corresponding voltage signals after current regulation;
s2.3, performing anti-rotation transformation on the corresponding voltage signals output in the step S2, and transforming the corresponding voltage signals into corresponding voltage signals under a two-phase stationary transformation coordinate system;
s2.4, inputting the corresponding voltage signals under the two-phase static transformation coordinate system and the corresponding current signals under the two-phase static transformation coordinate system obtained in the step S1 into a rotor flux linkage observation and speed observation model, and using the obtained magnetic field orientation angle for the two-phase rotation coordinate transformation in the step S1;
meanwhile, inputting corresponding voltage signals under the two-phase static transformation coordinate system to an inverter in a frequency converter for control, and further driving a first motor to start;
s3, when the first motor is started in the step S2 to enable the rotating speed of the first motor to reach the rotating speed of the second motor, the first motor and the second motor are connected through a coupler to enable the first motor and the second motor to coaxially operate.
Further, in step S3, after the coaxial operation, the method further includes: the first motor is switched to torque ring control,
in the operation process of coaxially operating the first motor and the second motor to jointly drive an external load, the first motor and the second motor are controlled to synchronously operate according to the following method:
if the output power of the first motor changes:
when the frequency converter controls the first motor to increase the electromagnetic torque of the first motor, the slip of the second motor is reduced;
when the frequency converter controls the first motor to reduce the electromagnetic torque of the first motor, the slip of the second motor is increased;
if the output power of the second motor changes:
the rotating speeds of the first motor and the second motor are adjusted along with the power of the first motor, so that the first motor and the second motor run at the same rotating speed.
Further, in step S2.2, between the current adjusted voltage signal and the output corresponding voltage signal, the method further includes:
and respectively performing feedforward compensation on the preset exciting current and the preset torque current, and then performing addition operation on the difference comparison results corresponding to the preset exciting current and the preset torque current.
Further, the diesel generator is also included;
the diesel generator is connected with the photovoltaic power generation system and/or the wind power generation system and is used for providing a power supply for the photovoltaic power generation system and/or the wind power generation system before starting.
Further, the system also comprises an energy storage system;
the energy storage system is respectively connected with the output end of the photovoltaic power generation system and/or the wind power generation system and is used for storing and dissipating the surplus electric quantity generated by the photovoltaic power generation system and/or the wind power generation system;
the control system is connected with the energy storage system and is used for controlling the energy storage system to deliver the electric energy to the step-up transformer according to the control signal sent by the electric quantity management system.
In addition, the invention also provides a new energy power generation direct drive system, which is characterized by comprising an electric quantity management system, a step-up transformer, a frequency converter, a first motor, a second motor, a gearbox, a control system, and a photovoltaic power generation system and/or a wind power generation system;
the electric quantity management system is respectively connected with the photovoltaic power generation system and/or the wind power generation system and is used for adjusting the electric energy management of the photovoltaic power generation system and the wind power generation system;
the output end of the photovoltaic power generation system and/or the output end of the wind power generation system are/is connected with the input end of the step-up transformer, and the output end of the step-up transformer is connected with the input end of the frequency converter;
the first motor is connected with the output end of the frequency converter, the second motor is driven by an external power grid, the first motor is connected with the second motor through a synchronous clutch, and the output end of the second motor is connected with an external load through a gearbox;
the control system is respectively connected with the electric quantity management system and the frequency converter and is used for controlling the output of the frequency converter according to a control signal sent by the electric quantity management system;
the first motor and the second motor are started by the following method:
s1, starting a second motor, wherein the first motor and the second motor are disconnected, and starting the second motor;
s2, starting the first motor
S2.1, carrying out two-phase stationary coordinate conversion on three-phase stator current of a first motor to obtain corresponding current signals under a two-phase stationary conversion coordinate system, and then carrying out two-phase rotating coordinate conversion to obtain corresponding current signals under the two-phase rotating coordinate system; the corresponding current signals under the two-phase rotation coordinate system are respectively excitation current and torque current;
s2.2, comparing the exciting current and the torque current obtained in the step S1 with a preset exciting current and a preset torque current respectively, and outputting corresponding voltage signals after current regulation;
s2.3, performing anti-rotation transformation on the corresponding voltage signals output in the step S2, and transforming the corresponding voltage signals into corresponding voltage signals under a two-phase stationary transformation coordinate system;
s2.4, inputting the corresponding voltage signals under the two-phase static transformation coordinate system and the corresponding current signals under the two-phase static transformation coordinate system obtained in the step S1 into a rotor flux linkage observation and speed observation model, and using the obtained magnetic field orientation angle for the two-phase rotation coordinate transformation in the step S1;
meanwhile, inputting corresponding voltage signals under the two-phase static transformation coordinate system to an inverter in a frequency converter for control, and further driving a first motor to start;
s3, when the first motor is started in the step S2 to enable the rotating speed of the first motor to reach the rotating speed of the second motor, the first motor and the second motor are connected through the synchronous clutch to enable the first motor and the second motor to coaxially operate.
Further, in step S3, after the coaxial operation, the method further includes: the first motor is switched to torque ring control,
in the operation process of coaxially operating the first motor and the second motor to jointly drive an external load, the first motor and the second motor are controlled to synchronously operate according to the following method:
if the output power of the first motor changes:
when the frequency converter controls the first motor to increase the electromagnetic torque of the first motor, the slip of the second motor is reduced;
when the frequency converter controls the first motor to reduce the electromagnetic torque of the first motor, the slip of the second motor is increased;
if the output power of the second motor changes:
the rotating speeds of the first motor and the second motor are adjusted along with the power of the first motor, so that the first motor and the second motor run at the same rotating speed.
Further, in step S2.2, between the current adjusted voltage signal and the output corresponding voltage signal, the method further includes:
and respectively performing feedforward compensation on the preset exciting current and the preset torque current, and then performing addition operation on the difference comparison results corresponding to the preset exciting current and the preset torque current.
Further, the diesel generator is also included;
the diesel generator is connected with the photovoltaic power generation system and/or the wind power generation system and is used for providing a power supply for the photovoltaic power generation system and/or the wind power generation system before starting.
Further, the system also comprises an energy storage system;
the energy storage system is respectively connected with the output end of the photovoltaic power generation system and/or the wind power generation system and is used for storing and dissipating the surplus electric quantity generated by the photovoltaic power generation system and/or the wind power generation system;
the control system is connected with the energy storage system and is used for controlling the energy storage system to deliver the electric energy to the step-up transformer according to the control signal sent by the electric quantity management system.
Compared with the prior art, the invention has the beneficial effects that:
1. the novel energy power generation direct-drive system solves the problem that loads of the photovoltaic power generation and wind power generation direct-drive system which run in a isolated network cannot run continuously, and for areas and users where a large amount of photovoltaic power generation and/or wind power generation cannot run on the network, the novel energy power generation direct-drive system has the advantage of being capable of being used in nearby areas and users, a set of photovoltaic power generation and/or wind power generation distributed energy driving system is adopted, a first motor driven by a novel energy source such as photovoltaic power generation and/or wind power generation is added on the basis of a electric traction unit, and loads are dragged together with a second motor, so that the problems that the novel energy power generation of the users cannot run on the network and the loads cannot be dragged continuously are solved, green energy is utilized to the greatest extent, meanwhile, the use of enterprises to large power grid energy sources in the daytime power price peak is reduced, and the electricity consumption cost of the users is reduced.
The first motor decomposes current to dq axis through vector control to control decoupling of motor current, so as to achieve control effect similar to that of direct current motor, and realize real-time instruction tracking of current torque component iq and flux linkage component id, thereby realizing accurate control of electromagnetic torque. After the second motor is started, the first motor achieves synchronous rotation speed with the second motor through vector control, and then the two motors coaxially run through the synchronous clutch, so that the problem of synchronous control when the two motors powered by different power supplies drag the same load is successfully solved, and a simulation experiment proves that the method is effective.
2. According to the invention, the energy storage system and the control system are configured, so that the whole new energy power generation direct drive system is more flexible to use, and the power output of the photovoltaic power generation system and/or the wind power generation system can be regulated according to actual use requirements.
3. The control system can also control the output voltage of the frequency converter according to the control signal sent by the electric quantity management system, so that the flexibility of the system is further improved.
4. The method solves the problem that the motors powered by different power supplies have different influences on the motors due to different voltages, frequencies and power factors.
5. The method solves the problems of different rotating speeds and motor power distribution among motors powered by different power supplies.
6. The method solves the problem of shaft torsional vibration caused by different motor rotation speeds between motors powered by different power supplies.
Drawings
FIG. 1 is a schematic diagram of a new energy power generation direct drive system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the new energy power generation direct drive system of the present invention;
fig. 3 is a schematic block diagram of a method of starting the first motor of fig. 1 and 2 according to the present invention.
The system comprises a 1-photovoltaic power generation system, a 2-wind power generation system, a 3-energy storage system, a 4-control system, a 5-electric quantity management system, a 6-step-up transformer, a 7-frequency converter, an 8-first motor, a 9-second motor, a 10-gearbox, an 11-external load, a 12-external power grid and a 13-synchronous clutch.
Detailed Description
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 described embodiments do not limit the present invention.
Example 1
As shown in fig. 1, the new energy power generation direct drive system comprises an electric quantity management system 5, a step-up transformer 6, a frequency converter 7, a first motor 8, a second motor 9, a gearbox 10, an energy storage system 3, a control system 4, a photovoltaic power generation system 1 and a wind power generation system 2.
The electric quantity management system 5 is respectively connected with the photovoltaic power generation system 1 and the wind power generation system 2 and is used for adjusting the electric energy management of the photovoltaic power generation system 1 and/or the wind power generation system 2 so that the photovoltaic power generation system 1 and the wind power generation system 2 work according to preset parameter conditions. The output end of the photovoltaic power generation system 1 and the output end of the wind power generation system 2 are connected with the input end of the step-up transformer 6, the output end of the step-up transformer 6 is connected with the input end of the frequency converter 7, the electricity generated by the photovoltaic power generation system 1 and the wind power generation system 2 is boosted to a voltage level of 35KV or higher through the step-up transformer 6, and then the electric energy parameters are adjusted according to the actual needs of the first motor 8 through the frequency converter 7. The first motor 8 is connected to the output of the frequency converter 7, the second motor 9 is powered by an external power grid 12, the first motor 8 and the second motor 9 are directly connected through a coupling, the output of the second motor 9 is connected to an external load 11 through a gearbox 10, and in this embodiment, the external load 11 is a compressor.
The energy storage system 3 is respectively connected with the output ends of the photovoltaic power generation system 1 and the wind power generation system 2 and is used for storing and dissipating redundant electric quantity generated by the photovoltaic power generation system 1 and the wind power generation system 2, so that the starting and running power of the new energy driving motor are ensured to be enough, and the power supply quality of the photovoltaic power supply system is improved. The control system 4 is connected between the electric quantity management system 5 and the energy storage system 3, and is used for receiving a control signal sent by the electric quantity management system 5, controlling the electric energy sent by the energy storage system 3 to the step-up transformer 6 according to the control signal, and the control system 4 is also connected with the frequency converter 7, and controlling the output electric energy of the frequency converter 7 according to the control signal sent by the electric quantity management system 5. The electric quantity management system 5 is a remote control end of the whole new energy power generation direct-drive system, and the working operation of the whole system is controlled through the control system 4.
The first motor 8 and the second motor 9 are directly connected through a coupling and run at the same shaft and the same rotation speed, when the power generation of the photovoltaic power generation system 1 and the wind power generation system 2 is insufficient, the first motor 8 is used as a load and a unit to run together, at the moment, the first motor 8 has certain mechanical loss which is about within 1% of the rated power of the motor, and is similar to the application of a small motor to drag a large motor, in order to ensure stable voltage and power output when the first motor 8 is started, the photovoltaic power generation system 1 and/or the wind power generation system 2 is provided with the energy storage system 3 at the power station side, and a diesel generator can be further arranged in a corresponding power distribution system, so that the diesel generator is connected with the photovoltaic power generation system 1 and the wind power generation system 2 and the step-up transformer 6 and is used for providing a power supply before the photovoltaic power generation system 1 and the wind power generation system 2 are started. The second motor 9 is powered by an external power grid 12 and operates at power frequency, and the first motor 8 is controlled by frequency conversion, so that the purpose of coaxially driving an external load 11 with the second motor 9 is realized, and the second motor 9 powered by the external power grid 12 and the first motor 8 powered by the photovoltaic power generation system 1 and the wind power generation system 2 reliably operate at the same rotating speed.
The embodiment of the invention is more suitable for the existing power station which cannot be operated in a grid connection with a power frequency power grid due to policy reasons and has a nearby condition of being absorbed by new photovoltaic power generation systems 1 and/or wind power generation systems 2 or is built on the internet, and the condition of being absorbed is also provided, but a large amount of wind and light discarding phenomena still exist.
Example two
As shown in fig. 2, the first embodiment of the present invention is different in that the first motor 8 and the second motor 9 are not directly connected through a coupling but connected through a synchronization clutch 13.
The first motor 8 is matched with the rotation speed of the second motor 9, and is connected by adopting a synchronous clutch, when the rotation speed of the first motor 8 is larger than or equal to the rotation speed of the second motor 9, the instant input of the first motor 8 can be realized, when the power generation energy of the photovoltaic power generation system 1 and/or the wind power generation system 2 is insufficient, the first motor 8 is automatically cut off by the synchronous clutch 13, the reliable operation of the dragging load of the second motor 9 is ensured, and in addition, the photovoltaic power generation system 1 and/or the wind power generation system 2 can be provided with the energy storage system 3 at the power station side and a diesel generator in the corresponding power distribution system for stable voltage and power output when the first motor 8 is started.
The second motor 9 is powered by an external power grid 12 and operates at power frequency, and the first motor 8 is controlled by frequency conversion, so that the purpose of coaxially driving an external load 11 with the second motor 9 is realized, and the second motor 9 powered by the external power grid 12 and the first motor 8 reliably operate at the same rotating speed.
The invention has passed the technical simulation verification, the simulation result proves that the scheme of the invention is feasible.
In other embodiments of the present invention, the photovoltaic power generation system 1 and the wind power generation system 2 in the first and second embodiments of the present invention may be replaced with a single photovoltaic power generation system 1 or wind power generation system 2. The photovoltaic power generation system 1 and/or the wind power generation system 2 can be replaced by other new energy power generation systems, and the problem that the other new energy power generation systems can not continuously drive loads to work similarly can be solved, or the power supply efficiency of the other new energy systems can be improved.
In addition, the electric quantity management system 5, the control system 4 and the energy storage system 3 in the invention can all adopt the existing corresponding systems commonly used in the current power station system, wherein the corresponding software configured in the system is also the mature existing program, and the system can be directly configured for use and is not innovative in the invention.
In addition, because of the difference of the power grid parameters such as voltage, frequency and the like of the two paths of power supplies, the rotation speeds of the two motors are inconsistent, and when the same load is dragged, shaft torque is generated, so that the unit is in fault, and the unit cannot normally operate.
In the first embodiment and the second embodiment of the invention, the input of the frequency converter 7 can be a phase-shifting transformer, the secondary side is a step-down side, and a triangle type with extended sides is adopted. The three-phase input of each power unit is rectified by a rectifier bridge and filtered by a capacitor to become stable direct current, then the stable direct current is inverted into a single-phase SPWM waveform by an H bridge formed by IGBT, each phase is formed by connecting a plurality of power units in series, and the output is connected to form a high-voltage system to directly drive the second motor 2. When two motors powered by different power supplies drag the same external load 11 coaxially, the instantaneous voltage and frequency of the power supplies of the two motors may be different, so that the rotation speeds of the two motors are asynchronous, torsional vibration occurs in a shafting, overload of the motors occurs, and the like. In order to avoid this, the present invention also proposes a synchronization control method as follows:
when the motor is started, the second motor 9 is started first, then the first motor 8 which is controlled to run by the variable frequency torque ring is started, when the first motor 8 is started, the problem of coaxial driving of the two motors is considered, and the motor can be started in a rotating speed tracking way, so that the first motor 8 is dragged. Before the first motor 8 runs coaxially through the synchronous clutch 6 and the second motor 9, the first motor 8 is started through the frequency converter 7, so that the rotation speed of the first motor 8 is basically consistent with that of the second motor 9, and the frequency converter 7 controls the first motor 8 to run by adopting the speed sensorless vector control strategy shown in fig. 3. The vector control principle of the asynchronous motor is to decompose current to the dq axis to control the current of the asynchronous motor in a decoupling way, so that a control effect similar to that of a direct current motor is achieved, real-time instruction tracking of a current torque component iq and a flux linkage component id is achieved, and accurate control of electromagnetic torque is achieved.
The vector control of the first motor 8 start-up includes a rotational speed closed-loop control and a stator current closed-loop control. Presetting the rotor speedAnd the actual rotor rotational speed omega obtained by identification r Comparing the difference values, and outputting torque current after passing through PI speed regulatorNamely, the preset torque current is obtained, the preset rotor flux is compared with the actual rotor flux obtained by a rotor flux observation and speed observation model, and the exciting current is output through a flux linkage regulator>The preset exciting current is obtained. The stator current of the first motor 8 can be measured by a current transformer, the voltage is obtained by a voltage reconstruction technique, the obtained current signal (i A 、i B 、i C ) After three-phase stationary-to-two-phase stationary coordinate transformation (3 s/2s transformation), a corresponding current signal i under a two-phase stationary transformation coordinate system is obtained sα 、i sβ The current signal is used as the current input for calculating the rotor flux linkage observation and the speed observation of the rotor flux linkage and the magnetic field orientation angle theta, and simultaneously, the current signal is subjected to PARK transformation (two-phase stationary to two-phase rotating coordinate transformation) to obtain the corresponding current signal under the two-phase rotating coordinate system>Exciting current on two-phase rotation coordinate system dq +.>Torque current->Respectively is +.>Preset torque current +.>After difference operation, the current regulator is input, and then the preset exciting current and the preset torque current are respectively subjected to feedforward compensation, and then the sum operation is carried out on the comparison result of the difference value and the corresponding difference value, and a voltage signal on a dq axis system is output>Then transformed into the voltage on the two-phase stationary coordinate system alpha beta by the inverse PARK>Taking the voltage as input for calculating a rotor flux linkage observation and speed observation model, and simultaneously carrying out inverter VSIControl, and thus drive the first motor 8 to operate.
The vector control is based on real-time instruction tracking for realizing the current torque component iq and the flux linkage component id, so that accurate control of electromagnetic torque is realized.
After the first motor 8 achieves the synchronous rotation speed with the second motor 9, the synchronous clutch 6 switches the first motor 8 and the second motor 9 to coaxially run, the rotation speed ring started by the first motor 8 can be controlled and cut off, a torque ring vector control mode is adopted, and the control method after switching is as follows:
when the first motor 8 and the second motor 9 are coaxially operated, the first motor 8 adopts a maximum power operation vector control mode, the first motor 8 coaxially drives the load 5 according to the power output of the photovoltaic power generation system and/or the wind power generation system, and the second motor 9, in the process, the first motor 8 and the second motor 9 need to operate at the same rotation speed and the same frequency, and the power equation and the torque equation of the system are respectively as follows:
P first motor +P Second motor ＝P Load(s)
Wherein P is First motor For the output power of the first motor, P Second motor For the output power of the second motor, P Load(s) For the power of the load, T First motor For the output torque of the first motor, T Second motor For the output torque of the second motor, T Load(s) The torque of the load, J is the moment of inertia of the system,is the system acceleration.
The difference between the output torque of the second motor 9 and the output torque of the first motor 8 controlled by the frequency converter 7 and the torque of the load 5 determines the rotational speed variation and the synchronicity control of the system. When the frequency converter 7 varies according to the available energy of the photovoltaic power generation system and/or the wind power generation system, the output power also varies. When the frequency converter 7 controls the first motor 8 to output larger electromagnetic torque according to the increased active power command, the acceleration of the system is positive, the system is accelerated to run, so that the slip of the second motor 9 is reduced, the output electromagnetic torque is also reduced, and the torque equation of the system is rebalanced; when the frequency converter 7 controls the electromagnetic torque output by the first motor 8 to be reduced according to the instruction of reducing the active power, the adjustment process of the electromagnetic torque equation of the system is exactly opposite to the above process, so that the system reaches a new balance.
When the output power of the second motor 9 changes to cause the slip of the second motor 9 to change, the rotation speed is consistent to change along with the fluctuation of the power output of the first motor 8, so that the second motor 9 and the first motor 8 run coaxially and at the same rotation speed, and the running rotation speed of the system is changed between the rated load rotation speed and the idle rotation speed of the second motor 9.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A new energy power generation direct-drive system is characterized in that: the device comprises an electric quantity management system (5), a step-up transformer (6), a frequency converter (7), a first motor (8), a second motor (9), a gearbox (10), a control system (4) and a photovoltaic power generation system (1) and/or a wind power generation system (2);
the electric quantity management system (5) is respectively connected with the photovoltaic power generation system (1) and/or the wind power generation system (2) and is used for adjusting the electric energy management of the photovoltaic power generation system (1) and/or the wind power generation system (2);
the output end of the photovoltaic power generation system (1) and/or the output end of the wind power generation system (2) are/is connected with the input end of the step-up transformer (6), and the output end of the step-up transformer (6) is connected with the input end of the frequency converter (7);
the first motor (8) is connected with the output end of the frequency converter (7), the second motor (9) is driven by an external power grid (12), the first motor (8) is connected with the second motor (9) through a coupler, and the output end of the second motor (9) is connected with an external load (11);
the control system (4) is respectively connected with the electric quantity management system (5) and the frequency converter (7) and is used for controlling the output of the frequency converter (7) according to a control signal sent by the electric quantity management system (5);
the first motor (8) and the second motor (9) are started by the following method:
s1, starting a second motor (9)
The first motor (8) is disconnected with the second motor (9), and the second motor (9) is started;
s2 starting the first motor (8)
S2.1, carrying out two-phase stationary coordinate conversion on three-phase stator current of a first motor (8) to obtain corresponding current signals under a two-phase stationary conversion coordinate system, and then carrying out two-phase rotating coordinate conversion to obtain corresponding current signals under the two-phase rotating coordinate system; the corresponding current signals under the two-phase rotation coordinate system are respectively excitation current and torque current;
s2.2, comparing the exciting current and the torque current obtained in the step S1 with a preset exciting current and a preset torque current respectively, and outputting corresponding voltage signals after current regulation;
s2.3, performing anti-rotation transformation on the corresponding voltage signals output in the step S2, and transforming the corresponding voltage signals into corresponding voltage signals under a two-phase stationary transformation coordinate system;
s2.4, inputting the corresponding voltage signals under the two-phase static transformation coordinate system and the corresponding current signals under the two-phase static transformation coordinate system obtained in the step S1 into a rotor flux linkage observation and speed observation model, and using the obtained magnetic field orientation angle for the two-phase rotation coordinate transformation in the step S1;
meanwhile, inputting corresponding voltage signals under the two-phase static transformation coordinate system to an inverter in a frequency converter (7) for control, and further driving a first motor (8) to start;
s3, when the first motor (8) is started in the step S2 to enable the rotating speed of the first motor (8) to reach the rotating speed of the second motor (9), the first motor (8) and the second motor (9) are connected through a coupler to enable the first motor and the second motor to coaxially operate.
2. The new energy power generation direct-drive system according to claim 1, wherein:
in step S3, after the coaxial operation, the method further includes: the first motor (8) is switched to torque ring control,
in the operation process of coaxially operating the first motor (8) and the second motor (9) and jointly driving an external load (11), the first motor (8) and the second motor (9) are controlled to synchronously operate according to the following method:
if the output power of the first motor (8) changes:
when the frequency converter (7) controls the first motor (8) to increase the electromagnetic torque of the first motor (8), the slip of the second motor (9) is reduced;
when the frequency converter (7) controls the first motor (8) to reduce the electromagnetic torque of the first motor (8), the slip of the second motor (9) is increased;
if the output power of the second motor (9) changes:
the rotation speeds of the first motor (8) and the second motor (9) are adjusted along with the power of the first motor (8) so that the first motor (8) and the second motor (9) run at the same rotation speed.
3. The new energy power generation direct-drive system according to claim 1 or 2, characterized in that:
in step S2.2, between the current regulated voltage signal and the output corresponding voltage signal, further includes:
and respectively performing feedforward compensation on the preset exciting current and the preset torque current, and then performing addition operation on the difference comparison results corresponding to the preset exciting current and the preset torque current.
4. The new energy power generation direct-drive system according to claim 3, wherein: the diesel generator is also included;
the diesel generator is connected with the photovoltaic power generation system (1) and/or the wind power generation system (2) and is used for providing a power supply for the photovoltaic power generation system (1) and/or the wind power generation system (2) before starting.
5. The new energy power generation direct-drive system according to claim 4, wherein: also comprises an energy storage system (3);
the energy storage system (3) is respectively connected with the output ends of the photovoltaic power generation system (1) and/or the wind power generation system (2) and is used for dissipating and storing the surplus electric quantity generated by the photovoltaic power generation system (1) and/or the wind power generation system (2);
the control system (4) is connected with the energy storage system (3) and is used for controlling the electric energy which is transmitted to the step-up transformer (6) by the energy storage system (3) according to the control signal sent by the electric quantity management system (5).
6. A new energy power generation direct-drive system is characterized in that: the device comprises an electric quantity management system (5), a step-up transformer (6), a frequency converter (7), a first motor (8), a second motor (9), a gearbox (10), a control system (4) and a photovoltaic power generation system (1) and/or a wind power generation system (2);
the electric quantity management system (5) is respectively connected with the photovoltaic power generation system (1) and/or the wind power generation system (2) and is used for adjusting the electric energy management of the photovoltaic power generation system (1) and the wind power generation system (2);
the output end of the photovoltaic power generation system (1) and/or the output end of the wind power generation system (2) are/is connected with the input end of the step-up transformer (6), and the output end of the step-up transformer (6) is connected with the input end of the frequency converter (7);
the first motor (8) is connected with the output end of the frequency converter (7), the second motor (9) is driven by an external power grid (12), the first motor (8) is connected with the second motor (9) through a synchronous clutch (13), and the output end of the second motor (9) is connected with an external load (11);
the control system (4) is respectively connected with the electric quantity management system (5) and the frequency converter (7) and is used for controlling the output of the frequency converter (7) according to a control signal sent by the electric quantity management system (5);
the first motor (8) and the second motor (9) are started by the following method:
s1, starting a second motor (9)
The first motor (8) is disconnected with the second motor (9), and the second motor (9) is started;
s2, starting the first motor (8)
S2.1, carrying out two-phase stationary coordinate conversion on three-phase stator current of a first motor (8) to obtain corresponding current signals under a two-phase stationary conversion coordinate system, and then carrying out two-phase rotating coordinate conversion to obtain corresponding current signals under the two-phase rotating coordinate system; the corresponding current signals under the two-phase rotation coordinate system are respectively excitation current and torque current;
s2.2, comparing the exciting current and the torque current obtained in the step S1 with a preset exciting current and a preset torque current respectively, and outputting corresponding voltage signals after current regulation;
s2.3, performing anti-rotation transformation on the corresponding voltage signals output in the step S2, and transforming the corresponding voltage signals into corresponding voltage signals under a two-phase stationary transformation coordinate system;
s2.4, inputting the corresponding voltage signals under the two-phase static transformation coordinate system and the corresponding current signals under the two-phase static transformation coordinate system obtained in the step S1 into a rotor flux linkage observation and speed observation model, and using the obtained magnetic field orientation angle for the two-phase rotation coordinate transformation in the step S1;
meanwhile, inputting corresponding voltage signals under the two-phase static transformation coordinate system to an inverter in a frequency converter (7) for control, and further driving a first motor (8) to start;
s3, when the first motor (8) is started in the step S2 to enable the rotating speed of the first motor (8) to reach the rotating speed of the second motor (9), the first motor (8) and the second motor (9) are connected through a synchronous clutch (13) to coaxially operate.
7. The new energy power generation direct-drive system according to claim 6, wherein:
in step S3, after the coaxial operation, the method further includes: the first motor (8) is switched to torque ring control,
in the operation process of coaxially operating the first motor (8) and the second motor (9) and jointly driving an external load (11), the first motor (8) and the second motor (9) are controlled to synchronously operate according to the following method:
if the output power of the first motor (8) changes:
when the frequency converter (7) controls the first motor (8) to increase the electromagnetic torque of the first motor (8), the slip of the second motor (9) is reduced;
when the frequency converter (7) controls the first motor (8) to reduce the electromagnetic torque of the first motor (8), the slip of the second motor (9) is increased;
if the output power of the second motor (9) changes:
the rotation speeds of the first motor (8) and the second motor (9) are adjusted along with the power of the first motor (8) so that the first motor (8) and the second motor (9) run at the same rotation speed.
8. The new energy power generation direct-drive system according to claim 6 or 7, characterized in that:
in step S2.2, between the current regulated voltage signal and the output corresponding voltage signal, further includes:
and respectively performing feedforward compensation on the preset exciting current and the preset torque current, and then performing addition operation on the difference comparison results corresponding to the preset exciting current and the preset torque current.
9. The new energy power generation direct-drive system of claim 8, wherein: the diesel generator is also included;
the diesel generator is connected with the photovoltaic power generation system (1) and/or the wind power generation system (2) and is used for providing a power supply for the photovoltaic power generation system (1) and/or the wind power generation system (2) before starting.
10. The new energy power generation direct-drive system according to claim 9, wherein: also comprises an energy storage system (3);
the energy storage system (3) is respectively connected with the output ends of the photovoltaic power generation system (1) and/or the wind power generation system (2) and is used for dissipating and storing the surplus electric quantity generated by the photovoltaic power generation system (1) and/or the wind power generation system (2);
the control system (4) is connected with the energy storage system (3) and is used for controlling the electric energy which is transmitted to the step-up transformer (6) by the energy storage system (3) according to the control signal sent by the electric quantity management system (5).
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