CN109217709A - Bi-directional power conversion AC-DC control system and method based on IGBT - Google Patents
Bi-directional power conversion AC-DC control system and method based on IGBT Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention belongs to hand over straight alternating current gas transmission technical field, disclosing a kind of bi-directional power conversion AC-DC control system based on IGBT and method, set-up of control system has: incoming end, the first high voltage startup switching tube, circuit control end, current source, the second high voltage startup switching tube, monitoring device, connecting terminal, upper switch group, isolator, control system, controllable switch, power supply mould group, comparator, lower switch group, three-phase inverter, diode group, display screen, voltage sensor, temperature sensor, current sensor.Control system of the invention uses outer voltage and current inner loop double loop system, outer voltage controls output voltage, current inner loop control input current, to realize the correction of unity power factor, the AC-DC system can cover more to be reconfigured, and reserved control terminal, can be user-friendly according to BMS system and current loads grade smart allocation.
Description
Technical Field
The invention belongs to the technical field of alternating current-direct current-alternating current electric transmission, and particularly relates to a bidirectional power conversion AC-DC control system and method based on an IGBT.
Background
In recent years, with the increase of the national support force on new energy automobiles, the industrial scale is increasing year by year, the yield of the new energy automobiles in 2017 accounts for 2.7% of the total yield of the automobiles, and the new energy automobiles are in the top of the world for three continuous years. However, the vehicle pile ratio of the new energy automobile in China is only less than 3.5:1 at present, and the construction of charging infrastructure becomes a main problem restricting the development of the new energy automobile. The development of charging piles will put higher demands on the capacity and performance of the power grid, so that the charging stations are inevitably developed towards the micro-grid in a distributed power supply mode.
In order to meet the requirements of a micro-grid, particularly a direct-current micro-grid, an Insulated Gate Bipolar Transistor (IGBT) -based bidirectional power conversion AC-DC system is specially developed, the system topology adopts an LCL + IGBT structure, and space vector control (SVPWM) is adopted in control. For example, the AC-DC-AC can conveniently realize the four-quadrant operation of the AC motor; some devices in high voltage direct current transmission and flexible alternating current transmission; in a common DC bus microgrid charging station system. At present, a direct-current bus micro-grid is in vogue. The change of the charging power and the change of parameters such as a photovoltaic system connected into the direct-current bus microgrid can cause great influence on a power grid. The ACDC bidirectional power conversion system has to be developed in the application of the DC bus microgrid.
In summary, the problems of the prior art are as follows:
the existing device has certain harmonic pollution in the charging process, the current response speed is slow, and certain instability exists in the aspects of power factor compensation and electric energy feedback.
The difficulty and significance for solving the technical problems are as follows:
the difficulty lies in that: the prior art does not overcome harmonic pollution during charging.
After overcoming the prior art problem, the meaning of bringing is: the method has important significance in the fields of power factor compensation, electric energy feedback, active filtering and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a bidirectional power conversion AC-DC control system and method based on an IGBT.
The invention is realized in such a way that an IGBT-based bidirectional power conversion AC-DC control method comprises the following steps:
the system topology on the first high-voltage starting switch tube and the second high-voltage starting switch tube adopts an LCL + IGBT structure, and current control is carried out through a circuit control end after current is accessed at an access end;
establishing a transformer-based low-frequency equivalent model on the basis of dq coordinate transformation of a local circuit, and performing steady-state characteristic analysis;
meanwhile, a reduced order small signal mathematical model is established to control the AC-DC system;
the control system adopts a voltage outer loop to control output voltage and a current inner loop to control input current, and corrects a unit power factor;
the running state of the system is monitored in real time through the voltage sensor, the temperature sensor and the current sensor, and is displayed through the display screen.
Further, the method for controlling the current at the control end of the circuit comprises the following steps:
performing a non-linear transformation on the received current signal s (t) according to the following formula:
whereinA represents the amplitude of the signal, a (m) represents the symbol sign of the signal, p (t) represents the shaping function, fcWhich is indicative of the carrier frequency of the signal,representing the phase of the signal, resulting from the nonlinear transformation:
further, the method for establishing the transformer-based low-frequency equivalent model comprises the following steps:
receiving frequency hopping signals from a plurality of local circuits synchronously by using an array antenna containing M array elements, sampling each path of received signals to obtain M paths of sampled discrete time domain mixed signalsm＝1,2,…,M；
Step two, carrying out overlapping windowing short-time Fourier transform on the M paths of discrete time domain mixed signals to obtain time-frequency domain matrixes of the M mixed signalsp＝0,1,…,P-1,q＝0,1,…,Nfft-1, where P represents the total number of windows, NfftThe FFT transform length (p, q) represents a time frequency index, and the specific time frequency value isWhere N isfftDenotes the length of the FFT transform, p denotes the number of windowing times, TsDenotes the sampling interval, fsRepresenting sampling frequency, C being an integer, representing the number of sampling points at short-time Fourier transform windowing intervals, C < NfftAnd K isc＝Nfftthe/C is an integer, that is, a short-time Fourier transform of overlapping windowing is adopted;
step three, the obtained time-frequency domain matrix of the frequency hopping mixed signalCarrying out pretreatment; the method comprises the following steps:
first step, toA low energy-removing pre-treatment is carried out, i.e. at each sampling instant p, willSetting the amplitude value smaller than the threshold epsilon to 0 to obtainThe setting of the threshold epsilon is determined according to the average energy of the received signal;
secondly, find the nonzero time-frequency domain data of P time (P is 0,1,2, … P-1) and useIs shown in whichRepresenting time-frequency response at time pAnd normalizing and preprocessing the non-zero data by using the corresponding frequency index when the frequency index is not 0 to obtain a preprocessed vector b (p, q) [ b ]1(p,q),b2(p,q),…,bM(p,q)]TWherein
Further, the reduced order small signal mathematical model is:
the section of the digital modulation signals MASK, MFSK, MPSK with the zero Doppler frequency shift of the fractional order-reduced small signal fuzzy function is represented as:
wherein,is a width of Tb-a gate function of τ;
the three formulas are onlyOf MASK signalsNot always 1; of MFSK signalsNot always 1; for 2ASK signals, an0, 1; for 4ASK signals, anOf two signals 0,1,2, 3Different, the section profile with the Doppler frequency shift of the reduced order small signal fuzzy function being zero is different; for 2FSK signals, fm- Δ f, Δ f; for 4FSK signals, fmOf two signals-3 Δ f, - Δ f, Δ f,3 Δ fIn contrast, the profile of the slice with zero doppler shift of the reduced order small signal ambiguity function is also different.
Further, digital modulation signals x (of the voltage sensor and the current sensort) Is expressed as:
wherein tau is time delay shift, f is Doppler shift, 0 < a, b < α/2, x*(t) denotes the conjugate of x (t), when x (t) is a real signal, x (t)＜p＞＝|x(t)|＜p＞sgn (x (t)); when x (t) is a complex signal, [ x (t)]＜p＞＝|x(t)|p- 1x*(t)；
The signal detection model of the temperature sensor is expressed as:
r(t)＝x1(t)+x2(t)+…+xn(t)+v(t)
wherein x isi(t) is each signal component of the time-frequency overlapping signal, each component signal is independent and uncorrelated, n is the number of the time-frequency overlapping signal components, thetakiRepresenting the modulation of the phase of the carrier of the respective signal component, fciIs the carrier frequency, AkiAmplitude of the i-th signal at time k, TsiIs the symbol length.
It is another object of the present invention to provide a computer program running the IGBT-based bidirectional power conversion AC-DC control method.
Another object of the present invention is to provide a terminal carrying at least a controller implementing the IGBT-based bidirectional power conversion AC-DC control method.
It is another object of the present invention to provide a computer-readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the IGBT-based bidirectional power conversion AC-DC control method.
Another object of the present invention is to provide an IGBT-based bidirectional power conversion AC-DC control system that realizes the IGBT-based bidirectional power conversion AC-DC control method, the IGBT-based bidirectional power conversion AC-DC control system being provided with:
an access end;
the access end is used for connecting an external high-voltage wire set and is connected with the first high-voltage starting switch tube through a wire; the first high-voltage starting switch tube is linearly connected with the circuit control end; the circuit control end is connected with the current source;
the current source is in linear connection with the second high-voltage starting switch; the monitoring equipment comprises a display screen, a voltage sensor, a temperature sensor and a current sensor which are linearly connected with each other through a wire;
the wiring terminal is fixedly connected with the upper switch group;
the isolator is connected to the rear of the upper switch group; the isolator is connected with the control system; a controllable switch is connected between the control system and the power supply module; the lower switch group is linearly connected with the three-phase inverter;
the diode bank is located at the leftmost side of the device.
Another object of the present invention is to provide an AC-DC-AC electric drive device incorporating the IGBT-based bi-directional power conversion AC-DC control system.
In summary, the advantages and positive effects of the invention are
Compared with the traditional charging equipment, the system has the characteristics of high direct-current voltage utilization rate, sine input current, low harmonic content and current distortion rate, adjustable output voltage, strong load disturbance resistance, capability of realizing bidirectional energy flow, small volume, light weight and the like, and is more and more widely applied to the fields of power factor compensation, electric energy feedback, active filtering and the like.
In the current control of the circuit control end of the invention: performing a non-linear transformation on the received current signal s (t) according to the following formula:
after this nonlinear transformation:
in the establishment of a transformer-based low-frequency equivalent model,
receiving frequency hopping signals from a plurality of local circuits synchronously by using an array antenna containing M array elements, sampling each path of received signals to obtain M paths of sampled discrete time domain mixed signalsm＝1,2,…,M；
Performing overlapping windowing short-time Fourier transform on the M paths of discrete time domain mixed signals to obtain time-frequency domain matrixes of the M mixed signalsFor the obtained time-frequency domain matrix of the frequency hopping mixed signalCarrying out pretreatment;
the reduced order small signal mathematical model is as follows: the section of the digital modulation signals MASK, MFSK, MPSK with the zero Doppler frequency shift of the fractional order-reduced small signal fuzzy function is represented as:
digital modulation signals x (of voltage and current sensors)t) Is expressed as:
wherein tau is time delay shift, f is Doppler shift, 0 < a, b < α/2, x*(t) denotes the conjugate of x (t), when x (t) is a real signal, x (t)＜p＞＝|x(t)|＜p＞sgn (x (t)); when x (t) is a complex signal, [ x (t)]＜p＞＝|x(t)|p-1x*(t)；
The signal detection model of the temperature sensor is expressed as:
r(t)＝x1(t)+x2(t)+…+xn(t)+v(t)
the operation model ensures the accurate operation of the bidirectional power conversion AC-DC control system and provides necessary conditions for intelligent control.
Drawings
FIG. 1 is a schematic diagram of an IGBT-based bidirectional power conversion AC-DC control system provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a monitoring device provided in an embodiment of the present invention;
in the figure: 1. an access end; 2. a first high-voltage starting switch tube; 3. a circuit control terminal; 4. a current source; 5. A second high-voltage starting switch tube; 6. monitoring equipment; 7. a wiring terminal; 8. an upper switch group; 9. an isolator; 10. a control system; 11. a controllable switch; 12. a power supply module; 13. a comparator; 14. a lower switch group; 15. a three-phase inverter; 16. a diode group; 17. a display screen; 18. a voltage sensor; 19. a temperature sensor; 20. and a current sensor.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.
The IGBT-based bidirectional power conversion AC-DC control method provided by the embodiment of the invention comprises the following steps:
the system topology on the first high-voltage starting switch tube and the second high-voltage starting switch tube adopts an LCL + IGBT structure, current is accessed at an access end and then passes through a circuit control end, and a current source is controlled by direct current;
establishing a transformer-based low-frequency equivalent model on the basis of dq coordinate transformation of a local circuit, and providing steady-state characteristic analysis;
meanwhile, a reduced order small signal mathematical model is established to control the AC-DC system;
the control system adopts a voltage outer loop to control output voltage, and a current inner loop to control input current to correct a unit power factor;
the running state of the system is monitored in real time through the voltage sensor, the temperature sensor and the current sensor, and is displayed through the display screen.
The structure of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to fig. 2, an IGBT-based bidirectional power conversion AC-DC control system and a control method according to an embodiment of the present invention includes: the circuit comprises an access end 1, a first high-voltage starting switch tube 2, a circuit control end 3, a current source 4, a second high-voltage starting switch tube 5, monitoring equipment 6, a wiring terminal 7, an upper switch group 8, an isolator 9, a control system 10, a controllable switch 11, a power supply module 12, a comparator 13, a lower switch group 14, a three-phase inverter 15, a diode group 16, a display screen 17, a voltage sensor 18, a temperature sensor 19 and a current sensor 20.
The access end 1 is used for connecting an external high-voltage wire set and is connected with the first high-voltage starting switch tube 2 through a wire; the first high-voltage starting switch tube 2 is linearly connected with the circuit control end 3; the circuit control end 3 is connected with a current source 4; the current source 4 is linearly connected with the second high-voltage starting switch tube 5; the monitoring device 6 comprises a display screen 17, a voltage sensor 18, a temperature sensor 19 and a current sensor 20 which are linearly connected with each other through a lead; the wiring terminal 7 is fixedly connected with the upper switch group 8;
the rear surface of the upper switch group 8 is connected with an isolator 9; the isolator 9 is connected with a control system 10; a controllable switch 11 is connected between the control system 10 and the power module 12; the lower switch group 14 is linearly connected with the three-phase inverter 15; the diode bank 16 is located at the leftmost side of the device.
The working principle of the invention is as follows:
the system topology on the first high-voltage starting switch tube 1 and the second high-voltage starting switch tube 5 adopts an LCL + IGBT structure, after the current is connected to the access end 1, the current passes through the circuit control end 3, the current source 4 adopts a direct current control method, the high-efficiency control method can bring a more stable system, a transformer-based low-frequency equivalent model is established on the basis of dq coordinate transformation of a local circuit, steady-state characteristic analysis is given, and meanwhile, a reduced-order small-signal mathematical model is established, so that the mathematical model of an AC-DC system is clearer, and the clear mathematical model is crucial to the realization of the control of the AC-DC system. The AC-DC system adopts input AC380V, the output can reach DC800V, the voltage adjustable range is wide, the output is insensitive to the input disturbance quantity, the control system 10 adopts a voltage outer ring and current inner ring double closed-loop system, the voltage outer ring controls the output voltage, and the current inner ring controls the input current, so as to realize the correction of the unit power factor; the upper switch group 8 and the lower switch group 14 respectively protect the output of current, the power module 12 can be controlled by the controllable switch 11 to protect after an emergency occurs, the running state of the system is monitored in real time by the voltage sensor 18, the temperature sensor 19 and the current sensor 20, and the running state is displayed by the display screen 17.
The invention is further described below with reference to specific assays.
The IGBT-based bidirectional power conversion AC-DC control method provided by the embodiment of the invention comprises the following steps:
the system topology on the first high-voltage starting switch tube and the second high-voltage starting switch tube adopts an LCL + IGBT structure, and current control is carried out through a circuit control end after current is accessed at an access end;
establishing a transformer-based low-frequency equivalent model on the basis of dq coordinate transformation of a local circuit, and performing steady-state characteristic analysis;
meanwhile, a reduced order small signal mathematical model is established to control the AC-DC system;
the control system adopts a voltage outer loop to control output voltage and a current inner loop to control input current, and corrects a unit power factor;
the running state of the system is monitored in real time through the voltage sensor, the temperature sensor and the current sensor, and is displayed through the display screen.
The method for controlling the current of the circuit control end comprises the following steps:
performing a non-linear transformation on the received current signal s (t) according to the following formula:
whereinA represents the amplitude of the signal, a (m) represents the symbol sign of the signal, p (t) represents the shaping function, fcWhich is indicative of the carrier frequency of the signal,representing the phase of the signal, resulting from the nonlinear transformation:
the method for establishing the transformer-based low-frequency equivalent model comprises the following steps:
receiving frequency hopping signals from a plurality of local circuits synchronously by using an array antenna containing M array elements, sampling each path of received signals to obtain M paths of sampled discrete time domain mixed signalsm＝1,2,…,M；
Step two, carrying out overlapping windowing short-time Fourier transform on the M paths of discrete time domain mixed signals to obtain time-frequency domain matrixes of the M mixed signalsp＝0,1,…,P-1,q＝0,1,…,Nfft-1, where P represents the total number of windows, NfftThe FFT transform length (p, q) represents a time frequency index, and the specific time frequency value isWhere N isfftDenotes the length of the FFT transform, p denotes the number of windowing times, TsDenotes the sampling interval, fsRepresenting sampling frequency, C being an integer, representing the number of sampling points at short-time Fourier transform windowing intervals, C < NfftAnd K isc＝Nfftthe/C is an integer, that is, a short-time Fourier transform of overlapping windowing is adopted;
step three, the obtained time-frequency domain matrix of the frequency hopping mixed signalCarrying out pretreatment; the method comprises the following steps:
first step, toWith a low-energy-removing pre-treatment, i.e. at each sampling instant p, willSetting the amplitude value smaller than the threshold epsilon to 0 to obtainThe setting of the threshold epsilon is determined according to the average energy of the received signal;
secondly, find the nonzero time-frequency domain data of P time (P is 0,1,2, … P-1) and useIs shown in whichRepresenting time-frequency response at time pAnd normalizing and preprocessing the non-zero data by using the corresponding frequency index when the frequency index is not 0 to obtain a preprocessed vector b (p, q) [ b ]1(p,q),b2(p,q),…,bM(p,q)]TWherein
The reduced order small signal mathematical model is as follows:
the section of the digital modulation signals MASK, MFSK, MPSK with the zero Doppler frequency shift of the fractional order-reduced small signal fuzzy function is represented as:
wherein,is a width of Tb-a gate function of τ;
the three formulas are onlyOf MASK signalsNot always 1; of MFSK signalsNot always 1; for 2ASK signals, an0, 1; for 4ASK signals, anOf two signals 0,1,2, 3Different, the section profile with the Doppler frequency shift of the reduced order small signal fuzzy function being zero is different; for 2FSK signals, fm- Δ f, Δ f; for 4FSK signals, fmOf two signals-3 Δ f, - Δ f, Δ f,3 Δ fIn contrast, the profile of the slice with zero doppler shift of the reduced order small signal ambiguity function is also different.
Further, digital modulation signals x (of the voltage sensor and the current sensort) Is expressed as:
wherein tau is time delay shift, f is Doppler shift, 0 < a, b < α/2, x*(t) denotes the conjugate of x (t), when x (t) is a real signal, x (t)＜p＞＝|x(t)|＜p＞sgn (x (t)); when x (t) is a complex signal, [ x (t)]＜p＞＝|x(t)|p-1x*(t)；
The signal detection model of the temperature sensor is expressed as:
r(t)＝x1(t)+x2(t)+…+xn(t)+v(t)
wherein x isi(t) is each signal component of the time-frequency overlapping signal, each component signal is independent and uncorrelated, n is the number of the time-frequency overlapping signal components, thetakiRepresenting the modulation of the phase of the carrier of the respective signal component, fciIs the carrier frequency, AkiAmplitude of the i-th signal at time k, TsiIs the symbol length.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, is implemented in a computer program product that includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the invention may be generated in whole or in part when the computer program instructions are loaded or executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.)). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. An IGBT-based bidirectional power conversion AC-DC control method, characterized in that the IGBT-based bidirectional power conversion AC-DC control method comprises:
the system topology on the first high-voltage starting switch tube and the second high-voltage starting switch tube adopts an LCL + IGBT structure, and current control is carried out through a circuit control end after current is accessed at an access end;
establishing a transformer-based low-frequency equivalent model on the basis of dq coordinate transformation of a local circuit, and performing steady-state characteristic analysis;
meanwhile, a reduced order small signal mathematical model is established to control the AC-DC system;
the control system adopts a voltage outer loop to control output voltage and a current inner loop to control input current, and corrects the unit power factor;
the running state of the system is monitored in real time through the voltage sensor, the temperature sensor and the current sensor, and is displayed through the display screen.
2. The IGBT-based bi-directional power conversion AC-DC control method of claim 1, wherein the method of current control at the circuit control terminal comprises:
performing a non-linear transformation on the received current signal s (t) according to the following formula:
whereinA represents the amplitude of the signal, a (m) represents the symbol sign of the signal, p (t) represents the shaping function, fcWhich is indicative of the carrier frequency of the signal,representing the phase of the signal, resulting from the nonlinear transformation:
3. the IGBT-based bi-directional power conversion AC-DC control method of claim 1, wherein the method of establishing a transformer-based low frequency equivalent model comprises:
step one, receiving frequency hopping signals from a plurality of local circuits synchronously by using an array antenna containing M array elements, sampling each path of received signals, and obtaining M paths of sampled signalsTime-domain hybrid signal
Step two, carrying out overlapping windowing short-time Fourier transform on the M paths of discrete time domain mixed signals to obtain time-frequency domain matrixes of the M mixed signals Wherein P represents the total number of windows, NfftThe FFT transform length (p, q) represents a time frequency index, and the specific time frequency value isWhere N isfftDenotes the length of the FFT transform, p denotes the number of windowing times, TsDenotes the sampling interval, fsRepresenting sampling frequency, C being an integer, representing the number of sampling points at short-time Fourier transform windowing intervals, C < NfftAnd K isc＝Nfftthe/C is an integer, that is, a short-time Fourier transform of overlapping windowing is adopted;
step three, the obtained time-frequency domain matrix of the frequency hopping mixed signalCarrying out pretreatment; the method comprises the following steps:
first step, toWith a low-energy-removing pre-treatment, i.e. at each sampling instant p, willSetting the amplitude value smaller than the threshold epsilon to 0 to obtainThe setting of the threshold epsilon is determined according to the average energy of the received signal;
secondly, find the nonzero time-frequency domain data of P time (P is 0,1,2, … P-1) and useIs shown in whichRepresenting time-frequency response at time pNormalizing and preprocessing the non-zero data by the corresponding frequency index when the non-zero data is not 0 to obtain a preprocessed vector b (p, q) ═ b1(p,q),b2(p,q),…,bM(p,q)]TWherein
4. The IGBT-based bi-directional power conversion AC-DC control method of claim 1, wherein the reduced order small signal mathematical model is:
the section of the digital modulation signals MASK, MFSK, MPSK with the zero Doppler frequency shift of the fractional order-reduced small signal fuzzy function is represented as:
wherein,is a width of Tb-a gate function of τ;
the three formulas are onlyOf MASK signalsNot always 1; of MFSK signalsNot always 1; for 2ASK signals, an0, 1; for 4ASK signals, anOf two signals 0,1,2, 3Different, the section profiles with the Doppler frequency shift of the reduced order small signal fuzzy function being zero are also different; for 2FSK signals, fm- Δ f, Δ f; for 4FSK signals, fmOf two signals-3 Δ f, - Δ f, Δ f,3 Δ fIn contrast, the profile of the slice with zero doppler shift of the reduced order small signal ambiguity function is also different.
5. The IGBT-based bi-directional power conversion AC-DC control method of claim 1, wherein the fractional low-order fuzzy function of the digital modulation signals x (t) of the voltage and current sensors is represented as:
wherein tau is time delay shift, f is Doppler shift, 0 < a, b < α/2, x*(t) denotes the conjugate of x (t), when x (t) is a real signal, x (t)＜p＞＝|x(t)|＜p＞sgn(x (t)); when x (t) is a complex signal, [ x (t)]＜p＞＝|x(t)|p-1x*(t)；
The signal detection model of the temperature sensor is expressed as:
r(t)＝x1(t)+x2(t)+…+xn(t)+v(t)
wherein x isi(t) is each signal component of the time-frequency overlapping signal, each component signal is independent and uncorrelated, n is the number of the time-frequency overlapping signal components, thetakiRepresenting the modulation of the phase of the carrier of the respective signal component, fciIs a carrier frequency, AkiAmplitude of the i-th signal at time k, TsiIs the symbol length.
6. A computer program for operating the IGBT-based bidirectional power conversion AC-DC control method according to any one of claims 1 to 5.
7. A terminal, characterized in that the terminal is equipped with at least a controller for implementing the IGBT-based bidirectional power conversion AC-DC control method according to any one of claims 1 to 5.
8. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the IGBT-based bidirectional power conversion AC-DC control method according to any one of claims 1 to 5.
9. An IGBT-based bidirectional power conversion AC-DC control system that realizes the IGBT-based bidirectional power conversion AC-DC control method according to claim 1, characterized in that the IGBT-based bidirectional power conversion AC-DC control system is provided with:
an access end;
the access end is used for connecting an external high-voltage wire set and is connected with the first high-voltage starting switch tube through a wire; the first high-voltage starting switch tube is linearly connected with the circuit control end; the circuit control end is connected with the current source;
the current source is in linear connection with the second high-voltage starting switch; the monitoring equipment comprises a display screen, a voltage sensor, a temperature sensor and a current sensor which are linearly connected with each other through a lead;
the wiring terminal is fixedly connected with the upper switch group;
the isolator is connected to the rear of the upper switch group; the isolator is connected with the control system; a controllable switch is connected between the control system and the power supply module; the lower switch group is linearly connected with the three-phase inverter;
the diode bank is located at the leftmost side of the device.
10. An AC-DC-AC electrical transmission carrying the IGBT-based bidirectional power conversion AC-DC control system of claim 9.
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