CN208656581U - A kind of double-fed asynchronous electricity generation system of changeable stream mode - Google Patents
A kind of double-fed asynchronous electricity generation system of changeable stream mode Download PDFInfo
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- CN208656581U CN208656581U CN201721449153.XU CN201721449153U CN208656581U CN 208656581 U CN208656581 U CN 208656581U CN 201721449153 U CN201721449153 U CN 201721449153U CN 208656581 U CN208656581 U CN 208656581U
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Abstract
The utility model has opened a kind of double-fed asynchronous electricity generation system of changeable stream mode, including prime mover and its transmission, double-fed asynchronous generator, dynamic restructuring current transformer, measurement control module etc..Pass through the conversion of multi-channel switch, the switching of grid-connected contactor and dynamic restructuring current transformer operating mode in dynamic restructuring current transformer, when generator speed is lower, with the electrical excitation of total power unsteady flow, either synchronously or asynchronously generation mode is run double-fed asynchronous electricity generation system, it is run when revolving speed is higher with the double-fed asynchronous generation mode of Partial Power unsteady flow, and in dynamic restructuring current transformer unit failure, continue to run electricity generation system by the system structure and operational mode that reconstruct current transformer.The utility model is simple and easy to do, the operational mode of double-fed asynchronous electricity generation system can be adjusted according to the working characteristics of prime mover, it run prime mover can in an optimal manner always, reduce the unsteady flow capacity of electricity generation system, improve energy conversion efficiency, stability and the reliability of system.
Description
Technical field
The utility model relates to the design of variable speed constant frequency generator system and operation and maintenance more particularly to a kind of changeable stream mode
Double-fed asynchronous electricity generation system.
Background technique
With the anxiety of the current energy, the exploitation of a variety of new energy such as wind energy, solar energy, tide energy and wave energy is obtained
It is more and more to pay attention to, vscf generator group has been widely used in the exploitation of these new energy.In order to improve by wind
The efficient energy conversion of the prime mover of drivings such as energy, tide energy and wave energy, the revolving speed of prime mover can change within the scope of some,
The revolving speed for the generator being driven by it changes therewith, and the frequency of electrical power also changes, and need to can just be connected to the grid, lead through current transformer
The electrical power for causing it to export is unstable, and harmonic content is high, since these energy have the characteristics that unstability, randomness, so that
The power quality that it is issued is low, is affected after being connected to the grid to power grid, even to abandon these energy sometimes, cause
Biggish waste.The part generator as caused by power grid receiving scarce capacity and new energy unstable equal self-characteristics suspends,
The main reason for rationing the power supply causes electric field performance driving economy to decline, and rations the power supply is grid-connected problem, and new energy power output is unstable, other electricity
Source provides peak regulation service for it, need to build the peak regulations such as water-storage, fuel gas generation, variable frequency power source, when peak capacity is in short supply, limit
Electric especially severe, optimization planning power supply architecture and power grid layout, expand electric energy consumption market, it is also necessary to by scientific and technical innovation, push away
The coordination of electrokinetic energy production and consumption.
Existing variable speed constant frequency generator system mainly includes double-fed asynchronous generator group and total power variable frequency synchro generator
Group, every vscf generator group is equipped with a generator-side converter wear, a grid-side converter constitutes the unsteady flow of cross-straight-intersection
Device.After converter system design, structure is fixed and invariable, and meets the limiting condition in converter system, each electricity when design
Source, load needs to configure biggish unsteady flow capacity and capacity immobilizes, so that converter system increased costs, flexibility reduce,
And needing whole system to shut down after the failure of the power device of converter system, cost greatly increases.
Currently, for conventional double-fed asynchronous generator group due to the limitation of its revolutional slip, when normal operation, prime mover is most
The slow-speed of revolution is higher, so that it needs higher starting revolving speed, and cannot be run when its starting with optimized rotating speed, reduce hair
The efficiency and economy of motor group.The magneto alternator group of total power unsteady flow is since there are cogging torques to turn its starting
Speed is higher, and needs biggish Converter Capacity, so that the cost of unit greatly improves.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the prior arts and deficiency provide a kind of double-fed of changeable stream mode
Induction generation system.It is permanent suitable for the total power unsteady flow of double-fed asynchronous generator group and the speed change of Partial Power unsteady flow dynamic adjustment
The transformation of the brand-new design for the electric system that takes place frequently and existing unit.
The utility model is achieved through the following technical solutions.
A kind of double-fed asynchronous electricity generation system of changeable stream mode, including it is prime mover and its transmission, double-fed asynchronous generator, dynamic
State reconstructs current transformer, measurement control module etc..Pass through the switching of multi-channel switch, grid-connected contactor in dynamic restructuring current transformer
And the conversion of dynamic restructuring current transformer operating mode, electricity generation system is in speed-changing Shi Yiquan function of the generator speed lower than setting
Either synchronously or asynchronously generation mode is run the electrical excitation of rate unsteady flow, when generator speed is higher than setting speed-changing with Partial Power
The double-fed asynchronous generation mode of unsteady flow is run, and in part unsteady flow branch trouble, passes through reconstruct converter system structure and operation
The adjustment of mode continues to run electricity generation system.
Prime mover and its transmission are by the electromechanical energy conversion devices such as wind energy conversion system, the hydraulic turbine, steam turbine and transmission shaft, change
The composition such as fast case (with/without), for converting mechanical energy for the energy for the substance that generates electricity.
Double-fed asynchronous generator is that electrification swipes the asynchronous generator of ring structure, double winding brushless double feed generator, how fixed
The brushless double feed generator etc. of rotor structure, for converting mechanical energy into electric energy.
Dynamic restructuring current transformer includes that power-type power electronic devices, multi-channel switch, grid-connected contactor and unsteady flow are auxiliary
Help module.Power-type power electronic devices uncontrollable, half control and full control by diode, thyristor, MOSFET, IGCT and IGBT etc.
The voltage-type and current mode power electronic device of type form, inverse for realizing the AC/DC rectification between alternating current and direct current bus, DC/AC
Become, the functions such as DC/DC transformation and afterflow, switch, isolation between DC bus, and under the control of measurement control module
Different ac bus and DC bus are connected by multy-way switching module, are realized between ac bus AC to DC bus DC
One-way or bi-directional electric energy transmission, and adjust according to operating status dynamic the topological structure of current transformer, it is pressure-resistant, resistance to when individual devices
, can be by multiple same model devices in series, parallel connection when stream is unsatisfactory for requiring, and increase pressure, flow equalizing circuit；Grid-connected contactor connects
Sending and receiving motor stator winding and AC network, when generator is with slow-speed of revolution total power unsteady flow mode operation for be isolated stator around
Group and power grid, in generator connect stator winding with power grid when high revolving speed Partial Power unsteady flow mode operation, by stator around
The power of group is sent directly into power grid；Multi-channel switch module is used to the power port of power electronic devices being switched to each exchange
Each phase of bus and each DC bus；Unsteady flow supplementary module includes DC filtering, ac filter, electromagnetic compatibility EMC filtering, transformation
Device and photoelectric coupling or electromagnetic coupling, for cooperating filtering, pressure regulation, afterflow, isolation etc. needed for unsteady flow process.
Measuring control module includes the sensors such as voltage, electric current, frequency, power, temperature, pressure, speed, revolving speed, angle,
Signal conditioning circuit, digital signal processing circuit and power device drive circuit, communicating circuit etc., for measuring electricity generation system
The operating parameter of each component, and with the operating status according to generating set, the switching of multy-way switching module is controlled, each section is adjusted
Operational mode makes generating set safe and stable operation.
The double-fed asynchronous electricity generation system of the changeable stream mode of this programme can with according to operating condition dynamic debugging system structure,
Suitable for performance, reliability, cost, the higher wind-power electricity generation of requirement on flexibility, hydroelectric generation and needing variable speed constant frequency generator
Power generation occasion.
The utility model compared with the existing technology, have following advantages and effects
The utility model control (or operation) is simple, it is easy to accomplish.
The utility model is opened according to the operating status of electricity generation system prime mover by multy-way switching in dynamic restructuring current transformer
It closes, the conversion of the switching of grid-connected contactor and dynamic restructuring current transformer operating mode and algorithm, dynamic adjusts the knot of converter plant
Structure to adapt to the operation of unsteady flow object, electricity generation system when generator speed is lower than by testing and calculating determining speed-changing with
Either synchronously or asynchronously generation mode is run the electrical excitation of total power unsteady flow, is higher than in generator speed by testing and calculating determining cut
It is run when changing revolving speed with the double-fed asynchronous generation mode of Partial Power unsteady flow, and in power module partial device failure by failure
Part is cut off, other normal devices is put into faulty component by multy-way switching module, and then replace defective device, made whole
A system remains to work normally.
As described above, this system technological means is simple and easy to do, total power unsteady flow and Partial Power unsteady flow system can be made full use of
The advantages of system, reduces whole unsteady flow capacity, improves system stability.
Detailed description of the invention
Fig. 1 is the double-fed asynchronous electricity generation system schematic diagram of the changeable stream mode of the utility model.
Fig. 2 is the structural schematic diagram that the utility model is used for double-fed asynchronous generator group.
Fig. 3 is that the utility model directly drives changeable stream mode dual-stator brushless Induction generation system schematic diagram.
Fig. 4 is that the utility model directly drives changeable stream mode dual-stator brushless Induction generation system schematic diagram.
The multiple-variable flow mode reformation schematic diagram of the conventional double-fed asynchronous electricity generation system of Fig. 5.
Specific embodiment
The purpose of utility model of the utility model is described in further detail in the following with reference to the drawings and specific embodiments,
The embodiments cannot be described here one by one, therefore the embodiments of the present invention is not limited to the following examples.It need to point out
It is that the utility model is the improved technical solution proposed to the hardware configuration of system, if relating to need during following instance
Software realization is wanted, is that those skilled in the art can realize according to prior art program.
As shown in Figure 1, the changeable double-fed asynchronous electricity generation system of stream mode, including prime mover and its transmission, double-fed asynchronous power generation
Machine, dynamic restructuring current transformer, measurement control module etc..Pass through multi-channel switch, grid-connected contactor in dynamic restructuring current transformer
Switching and dynamic restructuring current transformer operating mode conversion, electricity generation system generator speed be lower than by testing and calculating determination
Speed-changing when with the electrical excitation of total power unsteady flow either synchronously or asynchronously generation mode run, generator speed be higher than by testing
And it is run when calculating determining speed-changing with the double-fed asynchronous generation mode of Partial Power unsteady flow, and in part current transformer failure
When, electricity generation system is continued to run by reconstruct converter system structure and operational mode.
Prime mover and its transmission are by the electromechanical energy conversion devices such as wind energy conversion system, the hydraulic turbine, steam turbine and transmission shaft, change
The composition such as fast case (with/without), kinetic energy, potential energy for the substance that will generate electricity are mechanical energy；
Double-fed asynchronous generator is that electrification swipes the asynchronous generator of ring structure, double winding brushless double feed generator, how fixed
The brushless double feed generator etc. of rotor structure, for converting mechanical energy into electric energy；
Dynamic restructuring current transformer includes that power-type power electronic devices, multi-channel switch, grid-connected contactor and unsteady flow are auxiliary
Help module.Power-type power electronic devices is made of IGBT all-controlling power electronics device, for realizing between alternating current and direct current bus
AC/DC rectification, DC/AC inversion, function such as DC/DC transformation and afterflow, switch, isolation between DC bus, and measuring
Pass through multy-way switching module under the control of control module and connect different ac bus and DC bus, realizes that ac bus AC is arrived
The one-way or bi-directional electric energy transmission of DC bus DC, and according to the topological structure of operating status dynamic adjustment current transformer, when single device
, can be by multiple same model devices in series, parallel connection when part pressure-resistant, resistant to flow is unsatisfactory for requiring, and increase pressure, flow equalizing circuit；And
Net contactor connects generator unit stator winding and AC network, fixed for being isolated in the operation of generator slow-speed of revolution total power unsteady flow
Sub- winding and power grid connect stator winding with power grid in the high revolving speed Partial Power unsteady flow operation of generator, by stator winding
Power be sent directly into power grid；Multi-channel switch module is used to for the power port of power electronic devices to be connected to each exchange female
Each phase of line and each DC bus；Unsteady flow supplementary module includes DC filtering, ac filter, electromagnetic compatibility EMC filtering, transformer
And photoelectric coupling or electromagnetic coupling, for cooperating filtering, pressure regulation, afterflow, isolation etc. needed for unsteady flow process.
Measuring control module includes the sensors such as voltage, electric current, frequency, power, temperature, pressure, speed, revolving speed, angle,
Signal conditioning circuit, digital signal processing circuit and power device drive circuit, communicating circuit etc., for measuring electricity generation system
The operating parameter of each component, and according to the operating status of generating set, the switching of multy-way switching module is controlled, power device is adjusted
Operation algorithm (PWM control), and then adjust current transformer operational mode (pusher side mode, net side mode, rectification, inversion, change
Frequently), make generating set safe and stable operation.
Each section working method are as follows:
Prime mover is rotated through transmission system drives double-fed asynchronous generator, and when low speed, grid-connected contactor GC is opened, B3x group
Multi-channel switch K1 where full-control type power device throws into rotor windings, encourages for carrying out AC or DC to rotor windings
Magnetic makes generator work in asynchronously or synchronously generating state；Multi-channel switch K3x where B1x group full-control type power device is thrown
To stator winding, the electrical power for being issued stator winding is rectified, and is sent to DC bus DC1+；B2x group is controlled entirely
Multi-channel switch K2 where type power device throws into AC network, for will be fed into the electrical power of DC bus DC1+ into
AC network is sent into row inversion.
With the raising of generator speed, grid-connected contactor GC throws into ac bus, keeps generator unit stator winding grid-connected, directly
The electrical power that stator winding exports is sent to power grid, B1x group full-control type power device stops working at this time, as B2x, B3x
Organize the spare of full-control type power device；Multi-channel switch K2 where B2x group full-control type power device throws into AC network,
Multi-channel switch K1 where B3x group full-control type power device throws into rotor windings, encourages for carrying out exchange to rotor windings
Magnetic makes generator work in the routinely metasynchronism of double-fed asynchronous power generation, synchronization, supersynchronous generating state.
B2, B3 group full-control type power device are completely reciprocity, can be exchanged by multichannel fling-cut switch, as mutual backup
Power device；When any phase power device failure of B2 or B3 group, it can be put into and be replaced by K3x by B1 group full-control type power device
Failure phase.
Three groups of current devices of embodiment of Fig. 1 all use full-control type power device IGBT, performance highest, but cost
It is relatively high, embodiment 1 is simplified, embodiment as shown in Figure 2 is obtained.The changeable double-fed asynchronous electricity generation system of stream mode,
Including prime mover and its transmission, double-fed asynchronous generator, dynamic restructuring current transformer, measurement control module etc..Pass through dynamic restructuring
The conversion of multi-channel switch, the switching of grid-connected contactor and dynamic restructuring current transformer operating mode, electricity generation system in current transformer
When generator speed is lower, with the electrical excitation of total power unsteady flow, either synchronously or asynchronously generation mode is run, when revolving speed is higher with portion
The double-fed asynchronous generation mode operation of point power unsteady flow, and in part current transformer failure, by reconstruct converter system structure and
Operational mode continues to run electricity generation system.
Prime mover and its transmission are by the electromechanical energy conversion devices such as wind energy conversion system, the hydraulic turbine, steam turbine and transmission shaft, change
The composition such as fast case (with/without), kinetic energy, potential energy for the substance that will generate electricity are mechanical energy；
Double-fed asynchronous generator is that electrification swipes the asynchronous generator of ring structure, double winding brushless double feed generator, how fixed
The brushless double feed generator etc. of rotor structure, for converting mechanical energy into electric energy；
Dynamic restructuring current transformer includes that power-type power electronic devices, multi-channel switch, grid-connected contactor and unsteady flow are auxiliary
Help module.Power-type power electronic devices is made of power electronic devices such as diode, thyristor, IGBT, for realizing exchange,
AC/DC rectification, inversion between DC bus, the function such as DC/DC transformation and afterflow, switch, isolation between DC bus, and
Different ac bus and DC bus are connected by multy-way switching module under the control of measurement control module, realizes that exchange is female
The one-way or bi-directional electric energy of line AC to DC bus DC transmits, and the topological structure of current transformer is adjusted according to operating status dynamic, when
, can be by multiple same model devices in series, parallel connection when individual devices pressure-resistant, resistant to flow is unsatisfactory for requiring, and increase pressure, equal galvanic electricity
Road；Grid-connected contactor connection generator unit stator winding and AC network are used in the operation of generator slow-speed of revolution total power unsteady flow
Stator winding and power grid is isolated, connect stator winding with power grid in the high revolving speed Partial Power unsteady flow operation of generator, will determine
The power of sub- winding is sent directly into power grid；Multi-channel switch module is for the power port of power electronic devices to be connected to respectively
Each phase of ac bus and each DC bus；Unsteady flow supplementary module include DC filtering, ac filter, electromagnetic compatibility EMC filtering,
Transformer and photoelectric coupling or electromagnetic coupling, for cooperating filtering, pressure regulation, afterflow, isolation etc. needed for unsteady flow process.
Measuring control module includes the sensors such as voltage, electric current, frequency, power, temperature, pressure, speed, revolving speed, angle,
Signal conditioning circuit, digital signal processing circuit and power device drive circuit, communicating circuit etc., for measuring electricity generation system
The operating parameter of each component, and with the operating status according to generating set, the switching of multy-way switching module is controlled, power device is adjusted
Operation algorithm (PWM control), and then adjust current transformer operational mode (pusher side mode, net side mode, rectification, inversion, change
Frequently), make generating set safe and stable operation.
For implementation example figure 2, each section working method are as follows:
Prime mover is rotated through transmission system drives double-fed asynchronous generator, and when low speed, grid-connected contactor GC was opened, and B3x group is entirely
Multi-channel switch K1 where control type power device throws into rotor windings, for carrying out AC or DC excitation to rotor windings
Make generator work in asynchronously or synchronously generating state；Multi-channel switch where the full control of B1x group or half control type power device
K3 throws into AC network, is sent to DC bus DC1+ for the electrical power of power grid to be carried out rectification, then closed switch K4 will
DC current is sent into rotor windings and carries out DC excitation, makes generator work in synchronous generator state；B2x group full-control type power device
Multi-channel switch K2 where part throws into stator winding, and the electrical power that stator exports is carried out rectification and is sent to DC bus DC2
+；Multi-channel switch K1 where B3x group full-control type power device throws into AC network, for will be fed into DC bus DC2
+ electrical power carry out inversion, be sent to AC network.
With the raising of generator speed, grid-connected contactor GC throws into ac bus, keeps generator unit stator winding grid-connected, directly
The electrical power that stator winding exports is sent to power grid, switch K4 is opened at this time, and B1x group half control type power device stops working,
Spare rectifier as B2x, B3x group full-control type power device；Multi-channel switch where B3x group full-control type power device
K1 throws into AC network, and the multi-channel switch K2 where B2x group full-control type power device throws into rotor windings, for rotor
Winding carries out metasynchronism, the synchronization, supersynchronous generating state that AC excitation makes generator work in conventional double-fed asynchronous power generation.
B2, B3 group full-control type power device are completely reciprocity, can be exchanged by multichannel fling-cut switch, the function as mutual backup
Rate device, by the switching of K1, K2, keeps carrying out AC excitation to rotor windings, together when B2 or B3 group power device failure
When, K4 is opened, and K3 throws into AC network, and control or the work of half control type rectifier bridge entirely of B1 group will be sent to straight after power grid electrical power rectification
Flow bus DC1+, then through inductance, B4 group device form DC/DC circuit electrical power is sent to DC bus DC2+, for rotor around
Electrical power needed for group provides AC excitation.
Embodiment 1 is adjusted, embodiment as shown in Figure 3 is obtained.Directly drive changeable stream mode dual-stator brushless double-fed
Induction generation system, including prime mover and its transmission, dual-stator brushless double-fed asynchronous generator, dynamic restructuring current transformer, measurement
Control module etc..Pass through multi-channel switch, the switching of grid-connected contactor and dynamic restructuring current transformer in dynamic restructuring current transformer
The conversion of operating mode, electricity generation system are transported in a manner of the electrical excitation synchronous generator of total power unsteady flow when generator speed is lower
Row, when revolving speed is higher with the synchronization of Partial Power unsteady flow or the double-fed asynchronous generation mode operation of metasynchronism.
Prime mover and its transmission are made of the electromechanical energy conversion devices such as wind energy conversion system, the hydraulic turbine and transmission shaft etc., are used for
It is mechanical energy by the kinetic energy for the substance that generates electricity, potential energy；
Dual-stator brushless double-fed asynchronous generator is multiple stator and rotor structure, for converting mechanical energy into electric energy；
Dynamic restructuring current transformer includes that power-type power electronic devices, multi-channel switch, grid-connected contactor and unsteady flow are auxiliary
Help module.Power-type power electronic devices is made of power electronic devices such as diode, thyristor, IGBT, for realizing exchange,
AC/DC rectification, inversion between DC bus, the function such as DC/DC transformation and afterflow, switch, isolation between DC bus, and
Different ac bus and DC bus are connected by multy-way switching module under the control of measurement control module, realizes that exchange is female
The one-way or bi-directional electric energy of line AC to DC bus DC transmits, and the topological structure of current transformer is adjusted according to operating status dynamic, when
, can be by multiple same model devices in series, parallel connection when individual devices pressure-resistant, resistant to flow is unsatisfactory for requiring, and increase pressure, equal galvanic electricity
Road；Grid-connected contactor connection generator unit stator winding and AC network are used in the operation of generator slow-speed of revolution total power unsteady flow
Stator winding and power grid is isolated, connect stator winding with power grid in the high revolving speed Partial Power unsteady flow operation of generator, will determine
The power of sub- winding is sent directly into power grid；Multi-channel switch module is for the power port of power electronic devices to be connected to respectively
Each phase of ac bus and each DC bus；Unsteady flow supplementary module include DC filtering, ac filter, electromagnetic compatibility EMC filtering,
Transformer and photoelectric coupling or electromagnetic coupling, for cooperating filtering, pressure regulation, afterflow, isolation etc. needed for unsteady flow process；
Measuring control module includes the sensors such as voltage, electric current, frequency, power, temperature, pressure, speed, revolving speed, angle,
Signal conditioning circuit, digital signal processing circuit and power device drive circuit, communicating circuit etc., for measuring electricity generation system
The operating parameter of each component, and with the operating status according to generating set, the switching of multy-way switching module is controlled, power device is adjusted
Operation algorithm (PWM control), and then adjust current transformer operational mode (pusher side mode, net side mode, rectification, inversion, change
Frequently), make generating set safe and stable operation.
For implementation example figure 3, each section working method are as follows:
Prime mover directly drives the rotation of dual-stator brushless double-fed asynchronous generator through transmission shaft, when low speed grid-connected contactor GC
Open, B1x group control entirely or half control type power device where multi-channel switch K3 throw into AC network, for by the electricity of power grid
Power carries out rectification and is sent to DC bus DC1+, then DC current is sent into rotor windings progress direct current and encouraged by closed switch K4
Magnetic makes generator work in synchronous generator state；Multi-channel switch K2 where B2x group power device thyristor throws into power
The electrical power that stator exports is carried out rectification and is sent to DC bus DC2+ by winding；B4 group full-control type power device IGBT, DC2+,
DC3+, inductance constitute DC-DC voltage up converting circuit, and the electrical power for will enter into DC bus DC2+ is sent to direct current after boosting
Bus DC3+；Multi-channel switch K1 where B3x group full-control type power device IGBT throws into AC network, for will be fed into
The DC electric power of DC bus DC3+ carries out inversion, is sent to AC network.
With the raising of generator speed, grid-connected contactor GC throws into ac bus, keeps generator unit stator winding grid-connected, directly
The electrical power that stator winding exports is sent to power grid, switch K4 is opened at this time, and B1x group half control type power device stops working,
Spare rectifier as B2x group power device thyristor；Multi-channel switch where B3x group full-control type power device IGBT
K1 throws into control winding, keeps generator work same in the Asia of conventional double-fed asynchronous power generation for carrying out AC excitation to control winding
Step, synchronous generator state, the multi-channel switch K2 where B2x group power device thyristor throw into AC network, for that will hand over
The electrical power of galvanic electricity net carries out rectification and is sent to DC bus DC2+；B4 group full-control type power device IGBT, DC2+, DC3+, inductance
DC-DC voltage up converting circuit is constituted, the electrical power for will enter into DC bus DC2+ is sent to DC bus DC3+ after boosting.
The present embodiment replaces the electric brush slip ring mechanism of conventional double-fed asynchronous generator, while bimorph transducer using double-stator structure
The number of pole-pairs that generator can be increased reduces the grid-connected synchronous rotational speed of generator, and then cancels gear-box speed increasing mechanism and realize power generation
The low speed of machine directly drives, and improves Generation System Reliability, reduces the operation expense of electricity generation system.
Embodiment 3 is adjusted, embodiment as shown in Figure 4 is obtained.Directly drive changeable stream mode dual-stator brushless double-fed
Induction generation system, including it is prime mover and its transmission, dual-stator brushless double-fed asynchronous generator, dynamic restructuring current transformer, grid-connected
Contactor, multi-channel switch, measurement control module etc..Pass through multi-channel switch, the switching of grid-connected contactor and dynamic weight
The conversion of structure current transformer operating mode, electricity generation system is when generator speed is lower with the electrical excitation synchronous generator of total power unsteady flow
Mode is run, when revolving speed is higher with the synchronization of Partial Power unsteady flow or the double-fed asynchronous generation mode operation of metasynchronism.
Prime mover and its transmission are made of the electromechanical energy conversion devices such as wind energy conversion system, the hydraulic turbine and transmission shaft etc., are used for
It is mechanical energy by the kinetic energy for the substance that generates electricity, potential energy；
Dual-stator brushless double-fed asynchronous generator is multiple stator and rotor structure, for converting mechanical energy into electric energy；
Dynamic restructuring current transformer includes that power-type power electronic devices, multi-channel switch, grid-connected contactor and unsteady flow are auxiliary
Help module.Power-type power electronic devices is made of power electronic devices such as diode, thyristor, IGBT, for realizing exchange,
AC/DC rectification, inversion between DC bus, the function such as DC/DC transformation and afterflow, switch, isolation between DC bus, and
Different ac bus and DC bus are connected by multy-way switching module under the control of measurement control module, realizes that exchange is female
The one-way or bi-directional electric energy of line AC to DC bus DC transmits, and the topological structure of current transformer is adjusted according to operating status dynamic, when
, can be by multiple same model devices in series, parallel connection when individual devices pressure-resistant, resistant to flow is unsatisfactory for requiring, and increase pressure, equal galvanic electricity
Road；Grid-connected contactor connection generator unit stator winding and AC network are used in the operation of generator slow-speed of revolution total power unsteady flow
Stator winding and power grid is isolated, connect stator winding with power grid in the high revolving speed Partial Power unsteady flow operation of generator, will determine
The power of sub- winding is sent directly into power grid；Multi-channel switch module is for the power port of power electronic devices to be connected to respectively
Each phase of ac bus and each DC bus；Unsteady flow supplementary module include DC filtering, ac filter, electromagnetic compatibility EMC filtering,
Transformer and photoelectric coupling or electromagnetic coupling, for cooperating filtering, pressure regulation, afterflow, isolation etc. needed for unsteady flow process；
Measuring control module includes the sensors such as voltage, electric current, frequency, power, temperature, pressure, speed, revolving speed, angle,
Signal conditioning circuit, digital signal processing circuit and power device drive circuit, communicating circuit etc., for measuring electricity generation system
The operating parameter of each component, and with the operating status according to generating set, the switching of multy-way switching module is controlled, power device is adjusted
Operation algorithm (PWM control), and then adjust current transformer operational mode (pusher side mode, net side mode, rectification, inversion, change
Frequently), make generating set safe and stable operation.
For implementation example figure 4, each section working method are as follows:
Prime mover directly drives the rotation of dual-stator brushless double-fed asynchronous generator through transmission shaft, when low speed grid-connected contactor GC
Open, B1x group control entirely or half control type power device where multi-channel switch K3 throw into AC network, for by the electricity of power grid
Power carries out rectification and is sent to DC bus DC1+, then DC current is sent into rotor windings progress direct current and encouraged by closed switch K4
Magnetic makes generator work in synchronous generator state；Multi-channel switch K2 where B2x group power device thyristor throws into power
The electrical power that stator exports is carried out rectification and is sent to DC bus DC2+ by winding；B4 group full-control type power device IGBT, DC2+,
DC3+, inductance constitute DC-DC voltage up converting circuit, and the electrical power for will enter into DC bus DC2+ is sent to direct current after boosting
Bus DC3+；Multi-channel switch K1 where B3x group full-control type power device IGBT throws into AC network, B5x group full-control type
Multi-channel switch K5 where power device IGBT throws into AC network, and two groups of unsteady flow branch paired runnings of B3x, B5x are to mention
High unsteady flow capacity, the DC electric power for will be fed into DC bus DC3+ carry out inversion, are sent to AC network.
With the raising of generator speed, grid-connected contactor GC throws into ac bus, keeps generator unit stator winding grid-connected, directly
The electrical power that stator winding exports is sent to power grid, generator work is in conventional double-fed asynchronous generating state.When revolutional slip is exhausted
When to being worth smaller, switch K4 is opened, and B1x group half control type power device stops working；Two groups of unsteady flow branch relationships pair of B3x, B5x
Deng the double-fed asynchronous generating state of small revolutional slip can be run in capacity allowed band.
When revolutional slip increases, generator works in metasynchronism state.Multichannel where B3x group full-control type power device IGBT
Switching switch K1 throws into control winding, the multi-channel switch K5 where B5x group full-control type power device IGBT throw into control around
Group；Multi-channel switch K2 where B2x group power device thyristor throws into exchange winding, and the electrical power of AC network is carried out
Rectification is sent to DC bus DC2+；B4 group full-control type power device IGBT, DC2+, DC3+, inductance constitute DC-DC boost conversion electricity
Road, the electrical power for will enter into DC bus DC2+ are sent to DC bus DC3+ after boosting.
The present embodiment replaces the electric brush slip ring mechanism of conventional double-fed asynchronous generator, while bimorph transducer using double-stator structure
The number of pole-pairs that generator can be increased reduces the grid-connected synchronous rotational speed of generator, and then cancels gear-box speed increasing mechanism and realize power generation
The low speed of machine directly drives.Relative to embodiment 3, the B3x group full-control type IGBT converter part of larger capacity is divided into compared with little Rong
Two groups of B3x, B5x of amount can be such that unsteady flow capacity is adjusted according to operation conditions dynamic, expand under conditions of unsteady flow capacity is basically unchanged
The range of speeds of generating set is opened up, electricity generation system flexibility is improved.Two groups of power device relationship equities of B3x, B5x can be standby each other
With B2x group can be rectified branch investment by any group of failure, continued to run electricity generation system, improved Generation System Reliability, reduce
The operation expense of electricity generation system.
As shown in Figure 5.The multiple-variable flow mode reformation schematic diagram of conventional double-fed asynchronous electricity generation system, including prime mover and its biography
Dynamic, double-fed asynchronous generator, dynamic restructuring current transformer, measurement control module etc..Pass through grid-connected contact in dynamic restructuring current transformer
The conversion of the switching and current transformer operating mode of device, electricity generation system is when generator speed is lower with the electrical excitation of total power unsteady flow
Either synchronously or asynchronously generation mode is run, and is run when revolving speed is higher with the double-fed asynchronous generation mode of Partial Power unsteady flow.
Prime mover and its transmission are by the electromechanical energy conversion devices such as wind energy conversion system, the hydraulic turbine, steam turbine and transmission shaft, change
The composition such as fast case (with/without), kinetic energy, potential energy for the substance that will generate electricity are mechanical energy；
Double-fed asynchronous generator is that electrification swipes the asynchronous generator of ring structure, double winding brushless double feed generator, how fixed
The brushless double feed generator etc. of rotor structure, for converting mechanical energy into electric energy；
Dynamic restructuring current transformer includes that power-type power electronic devices, multi-channel switch, grid-connected contactor and unsteady flow are auxiliary
Help module.Power-type power electronic devices is explained the all-controlling power electronics devices such as pipe by IGBT, crystalline substance and is formed, for realizing exchange,
AC/DC rectification, inversion between DC bus, the functions such as DC/DC transformation and afterflow, switch, isolation between DC bus,
, can be by multiple same model devices in series, parallel connection when individual devices pressure-resistant, resistant to flow is unsatisfactory for requiring, and increase and press, flow
Circuit；Grid-connected contactor connection generator unit stator winding and AC network are used in the operation of generator slow-speed of revolution total power unsteady flow
In isolation stator winding and power grid, it connect stator winding with power grid in the high revolving speed Partial Power unsteady flow operation of generator, it will
The power of stator winding is sent directly into power grid；Unsteady flow supplementary module include DC filtering, ac filter, electromagnetic compatibility EMC filtering,
Transformer and photoelectric coupling or electromagnetic coupling, for cooperating filtering, pressure regulation, afterflow, isolation etc. needed for unsteady flow process；
Measuring control module includes the sensors such as voltage, electric current, frequency, power, temperature, pressure, speed, revolving speed, angle,
Signal conditioning circuit, digital signal processing circuit and power device drive circuit, communicating circuit etc., for measuring electricity generation system
The operating parameter of each component, and with the operating status according to generating set, the switching of grid-connected contactor is controlled, pusher side and net side are adjusted
The operational mode of current transformer, makes that generating set is safe and stable, efficient operation.
Each section working method are as follows:
Prime mover is rotated through transmission system drives double-fed asynchronous generator, and when low speed, grid-connected contactor GC is opened, K4 switch
Stator winding is thrown into, for carrying out DC excitation to generator unit stator winding, generator is made to work in electrical excitation synchronous generator
State；B2x group full-control type power device connection rotor windings run on rectification mode, by the power rectification of rotor output at direct current
It is sent to DC bus DC2+；B3x group full-control type power device connects AC network, runs on inverter mode, will be fed into direct current
The power of bus is sent into AC network, realizes total power unsteady flow when generating set low speed.
With the raising of generator speed, K4 switch is opened, and grid-connected contactor GC throws into ac bus, make generator unit stator around
Group is grid-connected, the electrical power that stator winding exports directly is sent to power grid, B1x group crystalline substance explains pipe rectifier bridge and stops working at this time；B2x
Group full-control type power device connects rotor windings, carries out AC excitation to rotor windings, and generator is made to work in Partial Power change
The double-fed asynchronous generator generator-side converter wear mode of stream；B3x group full-control type power device throws into AC network and works in part function
The double-fed asynchronous generator net side unsteady flow mode of rate unsteady flow makes generator work in the metasynchronism of double-fed asynchronous power generation, synchronization, surpasses
Synchronous generator state.
As described above, the utility model can be realized preferably.
The above embodiments of the present invention is merely examples for clearly illustrating the present invention, and is not
Limitations of the embodiments of the present invention.For those of ordinary skill in the art, on above explained basis
On can also make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.
Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in this reality
Within novel scope of protection of the claims.
Claims (5)
1. a kind of double-fed asynchronous electricity generation system of changeable stream mode, it is characterised in that including prime mover and its transmission mechanism, double-fed
Asynchronous generator, dynamic restructuring current transformer and measurement control module；By multi-channel switch in dynamic restructuring current transformer, grid-connected
The conversion of the switching and dynamic restructuring current transformer operating mode of contactor, electricity generation system cutting lower than setting in generator speed
With the electrical excitation of total power unsteady flow, either synchronously or asynchronously generation mode is run when changing revolving speed, is higher than in generator speed and is cut by what is set
It is run when changing revolving speed with the double-fed asynchronous generation mode of Partial Power unsteady flow, and in dynamic restructuring current transformer unit failure, led to
Crossing reconstruct converter system structure and operational mode continues to run electricity generation system.
2. a kind of double-fed asynchronous electricity generation system of changeable stream mode according to claim 1, it is characterised in that described former dynamic
Machine and its transmission mechanism are made of wind energy conversion system, the hydraulic turbine, steam turbine energy conversion device and transmission shaft and gearbox.
3. a kind of double-fed asynchronous electricity generation system of changeable stream mode according to claim 1, it is characterised in that the double-fed
Asynchronous generator be electrification swipe the asynchronous generator of ring structure, double winding brushless double feed generator, multiple stator and rotor structure nothing
Brush double-fed generator.
4. a kind of double-fed asynchronous electricity generation system of changeable stream mode according to claim 1, it is characterised in that the dynamic
Reconstruct current transformer includes that power-type power electronic devices, multy-way switching module, grid-connected contactor, unsteady flow supplementary module and exchange are female
Line, DC bus；
Power-type power electronic devices in the dynamic restructuring current transformer is by diode, thyristor, MOSFET, IGCT and IGBT
The voltage-type and current mode power electronic device of these uncontrollable, half controls and full-control type composition, for realizing alternating current and direct current bus
Between AC/DC rectification, DC/AC inversion, DC/DC transformation and afterflow, switch, isolation features between DC bus, and surveying
Pass through the multy-way switching module in dynamic restructuring current transformer under the control of amount control module and connects different ac bus and direct current
Bus is realized one-way or bi-directional electric energy transmission between ac bus AC and DC bus DC, and is adjusted according to operating status dynamic
The topological structure of current transformer, when individual devices pressure-resistant, resistant to flow is unsatisfactory for requiring, can by multiple same model devices in series, simultaneously
Connection, and increase pressure, flow equalizing circuit；
Grid-connected contactor connection generator unit stator winding and AC network in the dynamic restructuring current transformer, in double-fed asynchronous hair
Motor in double-fed asynchronous generator when total power unsteady flow mode operation with Partial Power, for stator winding and power grid to be isolated, to be become
Stream mode connect stator winding with power grid when running, and the power of stator winding is sent directly into power grid；
Multi-channel switch module in the dynamic restructuring current transformer is for the power port of power electronic devices to be switched to
Each phase of each ac bus and each DC bus；
The unsteady flow supplementary module include DC filtering, ac filter, electromagnetic compatibility EMC filtering, transformer and photoelectric coupling or
Electromagnetic coupling, for cooperating filtering, pressure regulation, afterflow, isolation needed for unsteady flow process.
5. a kind of double-fed asynchronous electricity generation system of changeable stream mode according to claim 1, it is characterised in that the measurement
Control module includes voltage, electric current, frequency, power, temperature, pressure, speed, revolving speed and angular transducer, signal conditioning circuit,
Digital signal processing circuit and power device drive circuit and communicating circuit, the operation for measuring each component of electricity generation system are joined
Number, and with the operating status according to generating set, the switching of multy-way switching module is controlled, the operational mode of each section is adjusted, makes to send out
Motor group safe and stable operation.
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