CN1945961A - AC exciting control system of double feed wind power generator based on DSP with secondary frequency modulation and its working method - Google Patents
AC exciting control system of double feed wind power generator based on DSP with secondary frequency modulation and its working method Download PDFInfo
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Abstract
This invention relates to an AC excitation control system of a wind power generator joining in the secondary frequency modulation based on DSP and its working method composed of a signal adjusting module, a central data process module, a power tube drive module, a converter module, a state monitor and a fault process module, which realizes high power factor output, utilizes resources of wind power to the utmost, stabilizes voltage of the end of the generator and increases quality of electric energy.
Description
(1) technical field:
The invention belongs to wind-driven generator AC excitation control technology field, especially a kind of AC exciting control system of double feed wind power generator and method of work thereof of the participation frequency modulation frequency modulation based on DSP.
(2) background technology:
Fast development along with the wind power generation cause, the single-machine capacity of wind turbine generator and the scale of wind power plant increase day by day, owing to injecting the power quality problem and the stability of power system problem that cause, wind-powered electricity generation causes concern day by day, and traditional wind power generator control system lacks the ability of electric power system being carried out frequency modulation frequency modulation, and one of effective way of seeking to address the above problem is the novel wind-driven generator AC exciting control system of development.There are shortcomings such as sensitivity is not high, poor anti jamming capability, real-time is bad, hardware circuit is complicated, reliability is low in the AC exciting control system of double feed wind power generator of having studied at present; The more important thing is that traditional control system can not participate in the frequency modulation frequency modulation task of electric power system automatically.Traditional control system is difficult to satisfy the requirement of modern big capacity wind-driven generator on control performance.Therefore, invention novel wind generator AC exciting control system is very important.
(3) summary of the invention
The object of the present invention is to provide a kind of AC exciting control system of double feed wind power generator of the participation frequency modulation frequency modulation based on DSP, it is in conjunction with DSP signal processor with high performance, can overcome the shortcoming of above-mentioned traditional control system preferably, not only can realize High Power Factor output, utilize wind energy resources to greatest extent; And the energy stabilize terminal voltage, improve the quality of power supply; When participating in the electric power system frequency modulation frequency modulation, improve the stability of electric power system; It is the control system that a kind of speed is fast, precision is high.
Technical scheme of the present invention: a kind of AC exciting control system of double feed wind power generator of the participation frequency modulation frequency modulation based on DSP, it is characterized in that it comprises signal condition module, central data processing module, power tube driver module, converter module and condition monitoring and fault processing module five parts composition, the input of said signal condition module connects the output of converter module, and the output of signal condition module connects the input of central data processing module; The output of said central data processing module connects the input of power tube driver module, and is connected with control panel is two-way with the pitch control system of wind-driven generator; The output of said power tube driver module connects the input of each IGCT gate pole input of converter module and condition monitoring and fault processing module; The input of said condition monitoring and fault processing module connects the output of converter module and the output of power tube driver module, and its output connects the input of central data processing module.
Above-mentioned said signal condition module is made of voltage, electric current AC sampling front-end circuit, frequency square wave translation circuit, speed feedback interface circuit, wind speed acquisition interface circuit; After handling voltage, the current signal gathered, said AC sampling front-end circuit sends into the A/D module input of central data processing module; Said frequency square wave translation circuit is transformed to the capture module input that square-wave signal is input to the central data processing module with voltage signal; The capture module input of central data processing module delivered to the signal of photoelectric encoder output after treatment by said speed feedback interface circuit; Said wind speed acquisition interface circuit is delivered to the air velocity transducer signal capture module input of central data processing module after treatment.
Above-mentioned said central data processing module mainly is made of dsp chip, CAN bus interface, electric power management circuit, crystal oscillating circuit, data/address bus drive circuit, serial communication interface circuit; Power management module export to dsp chip; The clock signal of crystal oscillating circuit is exported to dsp chip; The data/address bus drive circuit is exported to dsp chip, finishes data buffering and level conversion; Serial communication interface circuit is realized being connected with the two-way of wind-driven generator pitch control system, realizes the adjusting of propeller pitch angle; The CAN bus interface realizes being connected with the two-way of control panel; The application of the dsp chip system that makes not only can realize various digital signal processing algorithms real-time in the central data processing module, and has simplified the circuit of control system, has improved antijamming capability; The coordination control of each module is realized the function of frequency modulation frequency modulation by the central data processing module.
Above-mentioned said power tube driver module is made of photoelectric isolating circuit, power amplification circuit, insulating power supply circuit, IGCT over-current detection circuit.The power tube driver module amplifies space vector pulse duration modulation (SVPWM) signal of input through photoelectricity isolation, triode, offer converter module then; When detecting the IGCT overcurrent, IGCT over-current detection circuit output alarm signal is to condition monitoring and fault processing module.
Above-mentioned said converter module is made of rotor-side converter, grid side converter, DC side, IGCT buffer circuit, overvoltage, under-voltage detecting sensor and overcurrent, overheated detecting sensor; The input of grid side converter connects electrical network, and output connects the input of DC side; The output of DC side connects the input of rotor-side converter; The output of rotor-side converter connects the wind power generator rotor winding; Said rotor-side converter constitutes three-phase bridge circuit by 6 IGCT unit; The grid side converter constitutes three-phase bridge circuit by 6 IGCT unit.Break-make from the control signal of power tube driver module control IGCT produces required three-phase AC excitation power supply, realizes the adjusting of generator unit stator voltage, rotating speed, power equivalent is controlled.And, realize the double-fed function by the control of rotor-side converter and grid side converter being realized the two-way flow of rotor-side electric energy and electrical network electric energy.
Above-mentioned said condition monitoring and fault processing module are made of DC side overvoltage, undervoltage detection circuit, DC side overcurrent, overheating detection circuit, AC power lack detection circuit, IGCT over-current detection passage; The input of wherein DC side overvoltage, undervoltage detection circuit connects the overvoltage of DC side, the output of under-voltage detecting sensor; DC side overcurrent, overheating detection circuit input connect the output of overcurrent, overheated detecting sensor; AC power lack detection circuit input connects the voltage transformer output; IGCT over-current detection passage input connects the output of power tube driver module IGCT over-current detection circuit; The output of above-mentioned six parts is sent into the input of central data processing module as alarm signal, activates corresponding signal and handles subprogram, carries out the lock-out facility to converter module.
A kind of method of work of AC exciting control system of double feed wind power generator of the participation frequency modulation frequency modulation based on DSP is characterized in that it may further comprise the steps:
1) external sensor is gathered the needed signal of system, and these signals comprise the rotating speed of line voltage, wind speed, wind-driven generator and the frequency signal of electrical network; The signal that collects by the signal condition module amplify, shaping and conversion, the acceptable signal of output central data processing module;
2) the central data processing module to the signal that collects discern, judgement and data processing, and send the instruction that system is regulated.From power circuit always, when rotating speed was lower than with leg speed, electrical network was to rotor winding input electric power; When rotating speed was higher than with leg speed, the rotor winding was realized the two-way flow of rotor-side power to mains supply, and then realized the double-fed function;
3) 2) carry out in, condition monitoring and fault processing module receive the signal from the transmission of voltage transformer, and whether the line voltage phase shortage is judged; Signal by the overvoltage that receives DC side, under-voltage detecting sensor and receive the signal and the IGCT over-current detection signal of DC side overcurrent, overheated detecting sensor, to the running status of system converter module comprise the IGCT overcurrent, DC side is under-voltage, overvoltage, overcurrent, the overheated monitoring; When the abnormal work state took place, condition monitoring and fault processing module all can be given the central data processing module by output alarm signal; The central data processing module activates corresponding signal and handles subprogram, carries out the blockade to converter module;
4) the frequency square wave translation circuit by the signal condition module carries out the synchronizing frequency sampling to the frequency signal of electrical network, can be up to the power shortage situation of external electrical network after the central data processing module is discerned, judged it.When detected frequency is lower than a certain threshold values of electrical network rated frequency, illustrate that big power shortage takes place electrical network, at this moment the central data processing module will detect the ruuning situation of system and gather, under the situation that wind speed is fit to, when system is in stopped status, the central data processing module will activate subprograms corresponding, and system is brought into operation, and exports until highest power factor; Though when system is in running status, when not reaching highest power factor output, the central data processing module will activate subprograms corresponding, and system is moved under the highest power factor situation.
Above-mentioned said step 2) specifically may further comprise the steps in:
1. when wind speed is lower than rated wind speed, the central data processing module calculates the trigger angle of power circuit according to " vector control strategy of stator flux orientation ", provide space vector pulse duration modulation (SVPWM) start pulse signal, space vector pulse duration modulation (SVPWM) pulse signal amplifies through the power tube driver module, the signal triggering converter module rotor side converter after the amplification and the relevant IGCT unit of grid side converter, the frequency of control wind power generator rotor side input exciting voltage, the amplitude phase place, phase sequence, reach the purpose of regulating electromagnetic torque and idle output, realize that the best tip speed ratio control under the low wind speed operating mode promptly utilizes wind energy to greatest extent; At this moment, electrical network is to the rotor input electric power;
2. work as wind speed and be higher than rated wind speed, the central data processing module calculates the trigger angle of power circuit according to " vector control strategy of stator flux orientation ", provide space vector pulse duration modulation (SVPWM) start pulse signal, space vector pulse duration modulation (SVPWM) pulse signal amplifies through the power tube driver module, the signal triggering converter module rotor side converter after the amplification and the relevant IGCT unit of grid side converter, the frequency of control wind power generator rotor side input exciting voltage, the amplitude phase place, phase sequence reaches the purpose of regulating electromagnetic torque and idle output.Simultaneously, the central data processing module is by serial communication interface circuit, and system sends control signal to pitched, removes unnecessary energy by the method for pitched; At this moment, rotor is to the electrical network input electric power.
Operation principle of the present invention: the signal condition module comprises after the signal of telecommunication, wind velocity signal, tach signal, the frequency signal of line voltage instrument transformer and current sensors are handled the signal from the outside sends into the central data processing module.The central data processing module is moved corresponding program the signal and the data of input is handled.The central data processing module calculates the trigger angle of power circuit according to " vector control strategy of stator flux orientation " when wind speed is lower than rated wind speed, provide space vector pulse duration modulation (SVPWM) start pulse signal, space vector pulse duration modulation (SVPWM) pulse signal triggers the relevant IGCT unit in the converter module after the power tube driver module amplifies, the frequency of control wind power generator rotor side input exciting voltage, the amplitude phase place, phase sequence, reach the purpose of regulating electromagnetic torque and idle output, realize that the best tip speed ratio control under the low wind speed operating mode promptly utilizes wind energy to greatest extent; The central data treatment circuit calculates the trigger angle of power circuit according to " vector control strategy of stator flux orientation " when wind speed is higher than rated wind speed, provide the SVPWM start pulse signal, the SVPWM control wave triggers the relevant IGCT unit in the converter module after the power tube driver module amplifies, the frequency of control wind power generator rotor side input exciting voltage, the amplitude phase place, phase sequence, reach the purpose of regulating electromagnetic torque and idle output, and pass through serial communication interface circuit, system sends control signal to pitched, removes unnecessary energy by the method for pitched.From power circuit always, when rotating speed was lower than with leg speed, electrical network was to rotor winding feed-in electrical power; When rotating speed was higher than with leg speed, the rotor winding was to mains supply.When line voltage phase shortage, IGCT unit overcurrent, DC side is under-voltage, overvoltage, overcurrent, when overheated, condition monitoring and fault processing module all can be given the central data processing module by output alarm signal, the central data processing module activates corresponding signal and handles subprogram, carries out the blockade to converter module.Participation frequency modulation frequency modulation principle among the present invention is: when big power shortage takes place external electrical network, the frequency of whole electrical network reduces, frequency square wave translation circuit in the signal condition module of AC exciting control system, sample by synchronizing frequency, this situation is fed back to the central data processing module, and output in time adjusts to power by calling subprograms corresponding.
Superiority of the present invention and technique effect are: 1. adopt the DSP forming control system, hardware circuit is simple, the output trigger impulse is safe and reliable, precision of real time control is high, improves the stability and the reliability of system; 2. utilize high speed, the high accuracy data computing ability of dsp chip, overcome common single-chip microcomputer, make The whole control system have good adjusting function and sensitivity because of control hysteresis and precision defective that the processing speed restriction causes; 3. use based on " vector control strategy of stator flux orientation ", realize the variable speed constant frequency control of wind-driven generator and meritorious, idle independent regulation control, in burning voltage, improve active power output, improve the quality of power supply of electrical network.4. the frequency modulation frequency modulation function makes wind-driven generator participate in the frequency adjustment of electric power system automatically, particularly is applicable to the occasion of unattended operation, improves the stability of electric power system.5. integrate current power electronic technology, microelectric technique and software programming, use up-to-date Electric Machine Control theory, improved the runnability of wind-driven generator.
(4) description of drawings:
Accompanying drawing 1 is the AC exciting control system of double feed wind power generator of the related participation frequency modulation frequency modulation based on DSP of the present invention and the entire system structural representation in the method for work thereof.
Accompanying drawing 2 is signal condition modular structure schematic diagram in the AC exciting control system of double feed wind power generator of the related participation frequency modulation frequency modulation based on DSP of the present invention and the system in the method for work thereof.
Accompanying drawing 3 is central data processing module structural representation in the AC exciting control system of double feed wind power generator of the related participation frequency modulation frequency modulation based on DSP of the present invention and the system in the method for work thereof.
Accompanying drawing 4 is the AC exciting control system of double feed wind power generator of the related participation frequency modulation frequency modulation based on DSP of the present invention and the system's internal power pipe driver module structural representation in the method for work thereof.
Accompanying drawing 5 is the AC exciting control system of double feed wind power generator of the related participation frequency modulation frequency modulation based on DSP of the present invention and the structural representation of the system's inner conversion device module in the method for work thereof.
Accompanying drawing 6 is AC exciting control system of double feed wind power generator and the system's internal state monitoring in the method for work and the structural representation of fault processing module of the related participation frequency modulation frequency modulation based on DSP of the present invention.
(5) embodiment:
Embodiment: a kind of AC exciting control system of double feed wind power generator and method of work (see figure 1) thereof of the participation frequency modulation frequency modulation based on DSP, it is characterized in that it is made up of signal condition module, central data processing module, power tube driver module, converter module, condition monitoring and fault processing module five parts, the input of said signal condition module connects the output of converter module and is connected the external sensor output, the input of the output connection central data processing module of signal condition module; The output of said central data processing module connects the input of power tube driver module, and is connected with control panel is two-way with the pitch control system of wind-driven generator; The output of said power tube driver module connects the input of each IGCT gate pole input of converter module and condition monitoring and fault processing module; The input of said condition monitoring and fault processing module connects the output of converter module and the output of power tube driver module, and its output connects the input of central data processing module.
Above-mentioned said signal condition module (see figure 2) is made of voltage, electric current AC sampling front-end circuit, frequency square wave translation circuit, speed feedback interface circuit, wind speed acquisition interface circuit; After handling voltage, the current signal gathered, said AC sampling front-end circuit sends into the A/D module input of central data processing module; Said frequency square wave translation circuit is transformed to the capture module input that square-wave signal is input to the central data processing module with voltage signal; The capture module input of central data processing module delivered to the signal of photoelectric encoder output after treatment by said speed feedback interface circuit; Said wind speed acquisition interface circuit is delivered to the air velocity transducer signal capture module input of central data processing module after treatment.
The dsp chip TMS320F2812 that above-mentioned said central data processing module (see figure 3) is produced based on Texas Instruments, it mainly is made of CAN bus interface, electric power management circuit, crystal oscillating circuit, data/address bus drive circuit, serial communication interface circuit; Power management module export to dsp chip; The clock signal of crystal oscillating circuit is exported to dsp chip; The data/address bus drive circuit is exported to dsp chip, finishes data buffering and level conversion; Serial communication interface circuit is realized being connected with the two-way of wind-driven generator pitch control system, realizes the adjusting of propeller pitch angle; The CAN bus interface realizes being connected with the two-way of control panel; The application of the dsp chip system that makes not only can realize various digital signal processing algorithms real-time in the central data processing module, and it has simplified the circuit of control system, has improved antijamming capability; The coordination control of each module is realized the function of frequency modulation frequency modulation by the central data processing module; The software program of compiling is set various executive conditions, and the control dsp chip carries out identification, handles and send relevant control command to the input signal of data bus driving circuits.
Above-mentioned said power tube driver module (see figure 4) is a master chip with the EXB641 driver that FUJI ELECTRIC company produces, master chip is integrated photoelectric isolating circuit, power amplification circuit, insulating power supply circuit, IGCT over-current detection circuit.The power tube driver module amplifies space vector pulse duration modulation (SVPWM) signal of input through photoelectricity isolation, triode, offer converter module then; When detecting the IGCT overcurrent, IGCT over-current detection circuit output alarm signal is to condition monitoring and fault processing module.
Above-mentioned said converter module (see figure 5) is made of rotor-side converter, grid side converter, DC side, IGCT buffer circuit, overvoltage, under-voltage detecting sensor and overcurrent, overheated detecting sensor; The input of grid side converter connects electrical network, and output connects the input of DC side; The output of DC side connects the input of rotor-side converter; The output of rotor-side converter connects the wind power generator rotor winding; Said rotor-side converter has 6 IGCT unit to constitute three-phase bridge circuit, and the grid side converter constitutes three-phase bridge circuit by 6 IGCT unit.Break-make from the control signal of power tube driver module control IGCT produces required three-phase AC excitation power supply, realizes that voltage, the rotating speed to motor, the adjusting of power equivalent control.By the control of rotor-side converter and grid side converter being realized the two-way flow of rotor-side electric energy and electrical network electric energy, realize the double-fed function.
Above-mentioned said condition monitoring and fault processing module (see figure 6) are made of DC side overvoltage, undervoltage detection circuit, DC side overcurrent, overheating detection circuit, AC power lack detection circuit, IGCT over-current detection passage; The input of wherein DC side overvoltage, undervoltage detection circuit connects the overvoltage of DC side, the output of under-voltage detecting sensor; DC side overcurrent, overheating detection circuit input connect the output of overcurrent, overheated detecting sensor; AC power lack detection circuit input connects the voltage transformer output; IGCT over-current detection passage input connects the output of power tube driver module IGCT over-current detection circuit; The output of this six part is sent into the input of central data processing module as alarm signal, activates corresponding signal and handles subprogram, carries out the lock-out facility to converter module.
A kind of method of work of AC exciting control system of double feed wind power generator of the participation frequency modulation frequency modulation based on DSP is characterized in that it may further comprise the steps:
1) external sensor is gathered the needed signal of system, and these signals comprise the rotating speed of line voltage, wind speed, wind-driven generator and the frequency signal of electrical network; The signal that collects by the signal condition module amplify, shaping and conversion, the acceptable signal of output central data processing module.
2) the central data processing module to the signal that collects discern, judgement and data processing, and send the instruction that system is regulated.From power circuit always, when rotating speed was lower than with leg speed, electrical network was to rotor winding input electric power; When rotating speed was higher than with leg speed, the rotor winding was realized the two-way flow of rotor-side power to mains supply, and then realized the double-fed function.
Specifically may further comprise the steps in this step:
1. when wind speed is lower than rated wind speed, the central data processing module calculates the trigger angle of power circuit according to " vector control strategy of stator flux orientation ", provide space vector pulse duration modulation (SVPWM) start pulse signal, space vector pulse duration modulation (SVPWM) pulse signal amplifies through the power tube driver module, the signal triggering converter module rotor side converter after the amplification and the relevant IGCT unit of grid side converter, the frequency of control wind power generator rotor side input exciting voltage, the amplitude phase place, phase sequence, reach the purpose of regulating electromagnetic torque and idle output, realize that the best tip speed ratio control under the low wind speed operating mode promptly utilizes wind energy to greatest extent; At this moment, electrical network is to the rotor input electric power;
2. work as wind speed and be higher than rated wind speed, the central data processing module calculates the trigger angle of power circuit according to " vector control strategy of stator flux orientation ", provide space vector pulse duration modulation (SVPWM) start pulse signal, space vector pulse duration modulation (SVPWM) pulse signal amplifies through the power tube driver module, the signal triggering converter module rotor side converter after the amplification and the relevant IGCT unit of grid side converter, the frequency of control wind power generator rotor side input exciting voltage, the amplitude phase place, phase sequence reaches the purpose of regulating electromagnetic torque and idle output.Simultaneously, the central data processing module is by serial communication interface circuit, and system sends control signal to pitched, removes unnecessary energy by the method for pitched; At this moment, rotor is to the electrical network input electric power.
3) 2) carry out in, condition monitoring and fault processing module receive the signal from the transmission of voltage transformer, and whether the line voltage phase shortage is judged; Signal by the overvoltage that receives DC side, under-voltage detecting sensor and receive the signal and the IGCT over-current detection signal of DC side overcurrent, overheated detecting sensor, to the running status of system converter module comprise the IGCT overcurrent, DC side is under-voltage, overvoltage, overcurrent, the overheated monitoring; When the abnormal work state took place, condition monitoring and fault processing module all can be given the central data processing module by output alarm signal; The central data processing module activates corresponding signal and handles subprogram, carries out the blockade to converter module.
4) the frequency square wave translation circuit by the signal condition module carries out the synchronizing frequency sampling to the frequency signal of electrical network, can be up to the power shortage situation of external electrical network after the central data processing module is discerned, judged it.When detected frequency is lower than a certain threshold values of electrical network rated frequency, illustrate that big power shortage takes place electrical network, at this moment the central data processing module will detect the ruuning situation of system and gather, under the situation that wind speed is fit to, when system is in stopped status, the central data processing module will activate subprograms corresponding, and system is brought into operation, and exports until highest power factor; Though when system is in running status, when not reaching highest power factor output, the central data processing module will activate subprograms corresponding, and system is moved under the highest power factor situation.
Claims (8)
1, a kind of AC exciting control system of double feed wind power generator of the participation frequency modulation frequency modulation based on DSP, it is characterized in that it is made up of signal condition module, central data processing module, power tube driver module, converter module, condition monitoring and fault processing module five parts, the input of said signal condition module connects the output of converter module and is connected the external sensor output, the input of the output connection central data processing module of signal condition module; The output of said central data processing module connects the input of power tube driver module, and is connected with control panel is two-way with the pitch control system of wind-driven generator; The output of said power tube driver module connects the input of each IGBT gate pole input of converter module and condition monitoring and fault processing module; The input of said condition monitoring and fault processing module connects the output of converter module and the output of power tube driver module, and its output connects the input of central data processing module.
2, according to the AC exciting control system of double feed wind power generator and the method for work thereof of the said a kind of participation frequency modulation frequency modulation based on DSP of claim 1, it is characterized in that: described signal condition module is made of voltage, electric current AC sampling front-end circuit, frequency square wave translation circuit, speed feedback interface circuit, wind speed acquisition interface circuit; After handling voltage, the current signal gathered, said AC sampling front-end circuit sends into the A/D module input of central data processing module; Said frequency square wave translation circuit is transformed to the capture module input that square-wave signal is input to the central data processing module with voltage signal; The capture module input of central data processing module delivered to the signal of photoelectric encoder output after treatment by said speed feedback interface circuit; Said wind speed acquisition interface circuit is delivered to the air velocity transducer signal capture module input of central data processing module after treatment.
3, according to the AC exciting control system of double feed wind power generator and the method for work thereof of the said a kind of participation frequency modulation frequency modulation based on DSP of claim 1, it is characterized in that: described central data processing module mainly is made of dsp chip, CAN bus interface, electric power management circuit, crystal oscillating circuit, data/address bus drive circuit, serial communication interface circuit; Power management module export to dsp chip; The clock signal of crystal oscillating circuit is exported to dsp chip; The data/address bus drive circuit is exported to dsp chip, finishes data buffering and level conversion; Serial communication interface circuit is realized being connected with the two-way of wind-driven generator pitch control system, realizes the adjusting of propeller pitch angle; The CAN bus interface realizes being connected with the two-way of control panel; The application of the dsp chip system that makes not only can realize various digital signal processing algorithms real-time in the central data processing module, and it has simplified the circuit of control system, has improved antijamming capability; The coordination control of each module is realized the function of frequency modulation frequency modulation by the central data processing module.
4, according to the AC exciting control system of double feed wind power generator and the method for work thereof of the said a kind of participation frequency modulation frequency modulation based on DSP of claim 1, it is characterized in that: described power tube driver module is made of photoelectric isolating circuit, power amplification circuit, insulating power supply circuit, IGCT over-current detection circuit.The power tube driver module amplifies space vector pulse duration modulation (SVPWM) signal of input through photoelectricity isolation, triode, offer converter module then; When detecting the IGCT overcurrent, IGCT over-current detection circuit output alarm signal is to condition monitoring and fault processing module.
5, according to the AC exciting control system of double feed wind power generator and the method for work thereof of the said a kind of participation frequency modulation frequency modulation based on DSP of claim 1, it is characterized in that: described converter module is made of rotor-side converter, grid side converter, DC side, IGCT buffer circuit, overvoltage, under-voltage detecting sensor and overcurrent, overheated detecting sensor; The input of grid side converter connects electrical network, and output connects the input of DC side; The output of DC side connects the input of rotor-side converter; The output of rotor-side converter connects the wind power generator rotor winding; Said rotor-side converter has 6 IGCT unit to constitute three-phase bridge circuit, and the grid side converter constitutes three-phase bridge circuit by 6 IGCT unit.Break-make from the control signal of power tube driver module control IGCT produces required three-phase AC excitation power supply, realizes that voltage, the rotating speed to motor, the adjusting of power equivalent control.By the control of rotor-side converter and grid side converter being realized the two-way flow of rotor-side electric energy and electrical network electric energy, realize the double-fed function.
6, according to the AC exciting control system of double feed wind power generator and the method for work thereof of the said a kind of participation frequency modulation frequency modulation based on DSP of claim 1, it is characterized in that: described condition monitoring and fault processing module are made of DC side overvoltage, undervoltage detection circuit, DC side overcurrent, overheating detection circuit, AC power lack detection circuit, IGCT over-current detection passage; The input of wherein DC side overvoltage, undervoltage detection circuit connects the overvoltage of DC side, the output of under-voltage detecting sensor; DC side overcurrent, overheating detection circuit input connect the output of overcurrent, overheated detecting sensor; AC power lack detection circuit input connects the voltage transformer output; IGCT over-current detection passage input connects the output of power tube driver module IGCT over-current detection circuit; The output of this six part is sent into the input of central data processing module as alarm signal, activates corresponding signal and handles subprogram, carries out the lock-out facility to converter module.
7, a kind of method of work of AC exciting control system of double feed wind power generator of the participation frequency modulation frequency modulation based on DSP is characterized in that it may further comprise the steps:
1) external sensor is gathered the needed signal of system, and these signals comprise the rotating speed of line voltage, wind speed, wind-driven generator and the frequency signal of electrical network; The signal that collects by the signal condition module amplify, shaping and conversion, the acceptable signal of output central data processing module.
2) the central data processing module to the signal that collects discern, judgement and data processing, and send the instruction that system is regulated; From power circuit always, when rotating speed was lower than with leg speed, electrical network was to rotor winding input electric power; When rotating speed was higher than with leg speed, the rotor winding was realized the two-way flow of rotor-side power to mains supply, and then realized the double-fed function.
3) 2) carry out in, condition monitoring and fault processing module receive the signal from the transmission of voltage transformer, and whether the line voltage phase shortage is judged; Signal by the overvoltage that receives DC side, under-voltage detecting sensor and receive the signal and the IGCT over-current detection signal of DC side overcurrent, overheated detecting sensor, to the running status of system converter module comprise the IGCT overcurrent, DC side is under-voltage, overvoltage, overcurrent, the overheated monitoring; When the abnormal work state took place, condition monitoring and fault processing module all can be given the central data processing module by output alarm signal; The central data processing module activates corresponding signal and handles subprogram, carries out the blockade to converter module.
4) the frequency square wave translation circuit of signal condition module carries out the synchronizing frequency sampling to the frequency signal of electrical network, can be up to the power shortage situation of external electrical network after the central data processing module is discerned, judged it.When detected frequency is lower than the setting threshold values of electrical network rated frequency, illustrate that big power shortage takes place electrical network, at this moment the central data processing module will detect the ruuning situation of system and gather; Under the situation that wind speed is fit to, when system was in stopped status, the central data processing module will activate subprograms corresponding, and system is brought into operation, and exported until highest power factor; Though when system is in running status, when not reaching highest power factor output, the central data processing module will activate subprograms corresponding, and system is moved under the highest power factor situation.
8, according to the method for work of the AC exciting control system of double feed wind power generator of the said a kind of participation frequency modulation frequency modulation based on DSP of claim 7, it is characterized in that said step 2) in comprise following concrete steps:
1. when wind speed is lower than rated wind speed, the central data processing module calculates the trigger angle of power circuit according to " vector control strategy of stator flux orientation ", provide space vector pulse duration modulation (SVPWM) start pulse signal, space vector pulse duration modulation (SVPWM) pulse signal amplifies through the power tube driver module, the signal triggering converter module rotor side converter after the amplification and the relevant IGCT unit of grid side converter, the frequency of control wind power generator rotor side input exciting voltage, the amplitude phase place, phase sequence, reach the purpose of regulating electromagnetic torque and idle output, realize that the best tip speed ratio control under the low wind speed operating mode promptly utilizes wind energy to greatest extent;
2. when wind speed is higher than rated wind speed, the central data processing module calculates the trigger angle of power circuit according to " vector control strategy of stator flux orientation ", provide space vector pulse duration modulation (SVPWM) start pulse signal, space vector pulse duration modulation (SVPWM) pulse signal amplifies through the power tube driver module, the signal triggering converter module rotor side converter after the amplification and the relevant IGCT unit of grid side converter, the frequency of control wind power generator rotor side input exciting voltage, the amplitude phase place, phase sequence reaches the purpose of regulating electromagnetic torque and idle output.Simultaneously, the central data processing module is by serial communication interface circuit, and system sends control signal to pitched, removes unnecessary energy by the method for pitched.
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