CN109217709B - IGBT-based bidirectional power conversion AC-DC control system and method - Google Patents
IGBT-based bidirectional power conversion AC-DC control system and method 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 the technical field of AC-DC-AC electric transmission, and discloses a bidirectional power conversion AC-DC control system and method based on IGBT, wherein the control system is provided with: the switching device comprises an access end, a first high-voltage starting switch tube, a circuit control end, a current source, a second high-voltage starting switch tube, monitoring equipment, a wiring terminal, an upper switch group, an isolator, a control system, a controllable switch, a power supply module, a comparator, a lower switch group, a three-phase inverter, a diode group, a display screen, a voltage sensor, a temperature sensor and a current sensor. The control system adopts a voltage outer ring and current inner ring double closed loop system, the voltage outer ring controls output voltage, the current inner ring controls input current, so that correction of unit power factor is realized, the AC-DC system can be recombined in multiple sets, a control terminal is reserved, intelligent distribution can be realized according to a BMS system and the current load level, and convenience is brought to users.
Description
Technical Field
The invention belongs to the technical field of AC-DC-AC electric transmission, and particularly relates to a bidirectional power conversion AC-DC control system and method based on IGBT.
Background
In recent years, with the increasing of the supporting force of the country to the new energy automobile, the industrial scale is increasing year by year, the new energy automobile yield in 2017 accounts for 2.7% of the total automobile yield, and three consecutive years are in the world first. However, the vehicle-to-vehicle ratio of the new energy vehicles in China is less than 3.5:1 at present, and the construction of a charging infrastructure becomes a main problem for restricting the development of the new energy vehicles. The development of charging piles can put higher requirements on the capacity and performance of the power grid, so that the development of charging stations towards micro-power grids in a distributed power supply mode is a necessary trend.
In order to meet the requirements of micro-grids, particularly direct-current micro-grids, an insulated gate bipolar transistor (hereinafter referred to as 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, AC-DC-AC can conveniently realize four-quadrant operation of the alternating current motor; some of the devices in high voltage dc power transmission and flexible ac power transmission; the common direct current bus micro-grid charging station system. At present, direct current bus microgrid is in progress. And the change of parameters such as a photovoltaic system connected with the direct-current bus micro-grid and the like can cause great influence on the power grid. ACDC bi-directional power conversion systems would have to be developed for applications in dc bus microgrids.
In summary, the problems of the prior art are:
The existing device has certain harmonic pollution in the charging process, the response speed of current is slower, and certain instability exists in the aspects of power factor compensation and electric energy feedback.
Difficulty and meaning for solving the technical problems:
the difficulty is as follows: the prior art cannot overcome harmonic pollution during charging.
After overcoming the prior art problem, the significance brought is as follows: 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 existing in the prior art, the invention provides a bi-directional power conversion AC-DC control system and method based on IGBT.
The invention is realized in such a way that a bi-directional power conversion AC-DC control method based on IGBT 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 the current is accessed to an access end;
Establishing a low-frequency equivalent model based on a transformer on the basis of dq coordinate transformation of a local circuit, and analyzing steady-state characteristics;
meanwhile, a reduced order small signal mathematical model is established to control the AC-DC system;
the control system adopts an outer voltage loop to control output voltage and an inner current loop to control input current, so as to correct unit power factor;
the running state of the real-time monitoring system is monitored through the voltage sensor, the temperature sensor and the current sensor, and the running state is displayed through the display screen.
Further, the method for controlling the current by the circuit control terminal comprises the following steps:
the received current signal s (t) is non-linearly transformed according to the following formula:
Wherein the method comprises the steps of A represents the amplitude of the signal, a (m) represents the symbol sign of the signal, p (t) represents the shaping function, f c represents the carrier frequency of the signal,Representing the phase of the signal, and obtaining after the nonlinear transformation:
further, the method for establishing the low-frequency equivalent model based on the transformer comprises the following steps:
Step one, receiving synchronous frequency hopping signals from a plurality of local circuits 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 signals m＝1,2,…,M；
Step two, performing short-time Fourier transform of a overlap window on M paths of discrete time domain mixed signals to obtain a time-frequency domain matrix of M mixed signalsP=0, 1, …, P-1, q=0, 1, …, N fft -1, where P represents the total window number, N fft represents the FFT transform length (P, q) represents the time-frequency index, the specific time-frequency value isWhere N fft denotes the length of the FFT transform, p denotes the number of times of windowing, T s denotes the sampling interval, f s denotes the sampling frequency, C is an integer, C is the number of sampling points for the short-time Fourier transform windowing interval, C < N fft, and K c＝Nfft/C is an integer, that is, the short-time Fourier transform with overlapping windows is employed;
Step three, the obtained time-frequency domain matrix of the frequency hopping mixed signal Pretreating; comprising the following steps:
First step, for Low energy removal preprocessing, i.e. at each sampling instant p, willSetting the value with the amplitude 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;
second, find out the non-zero time-frequency domain data of P time (p=0, 1,2, … P-1) using Representation, whereinRepresents the time-frequency responseNormalizing the non-zero data by the corresponding frequency index when the data is not 0 to obtain a preprocessed vector b (p, q) = [ b 1(p,q),b2(p,q),…,bM(p,q)]T ], wherein
Further, the reduced order small signal mathematical model is:
the section where the doppler shift of the fractional reduced small signal blurring function of the digital modulated signal MASK, MFSK, MPSK is zero is expressed as:
Wherein, Is a gate function of width T b - τ;
only the three parts are Is different in the coefficient of MASK signalNot always 1; of MFSK signalsNot always 1; for a 2ASK signal, a n = 0,1; for a 4ASK signal, a n =0, 1,2,3, two signalsDifferent, the section profile with zero Doppler frequency shift of the reduced order small signal blurring function is also different; for a 2FSK signal, f m = - Δf, Δf; for a 4FSK signal, f m = -3 Δf, - Δf,3 Δf, two signalsThe profile of a tangent plane with zero doppler shift for the reduced order small signal blur function is different.
Further, the fractional lower order ambiguity function of the digital modulation signal x (t) of the voltage sensor and the current sensor is expressed as:
where τ is the delay offset, f is the Doppler shift, 0< a, b < α/2, x * (t) represents the conjugate of x (t), x (t) ＜p＞＝|x(t)|＜p＞ sgn (x (t)) when x (t) is the real signal; 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)
Where x i (T) is each signal component of the time-frequency overlapped signal, each component signal is independent and uncorrelated, n is the number of time-frequency overlapped signal components, θ ki represents modulation of carrier phases of each signal component, f ci is carrier frequency, a ki is amplitude of the ith signal at k time, and T si is symbol length.
It is a further object of the present invention to provide a computer program running the IGBT-based bi-directional power conversion AC-DC control method.
Another object of the present invention is to provide a terminal equipped with at least a controller for implementing the IGBT-based bidirectional power conversion AC-DC control method.
It is a further 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 described IGBT-based bi-directional 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 implementing 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 terminal;
The access end is used for connecting an external high-voltage line group and is connected with the first high-voltage starting switch tube through a lead; 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 pipeline connection with the second high-voltage starting switch; the monitoring device comprises a display screen, a voltage sensor, a temperature sensor and a current sensor which are connected with each other in a linear manner through wires;
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 connected with the three-phase inverter linearly;
the diode group is located at the leftmost side of the device.
Another object of the present invention is to provide an AC-DC-AC electric transmission device on which the IGBT-based bidirectional power conversion AC-DC control system is mounted.
In summary, the invention has the advantages and positive effects that
Compared with the traditional charging equipment, the system has the characteristics of high direct-current voltage utilization rate, sinusoidal 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 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 terminal, the invention comprises the following steps: the received current signal s (t) is non-linearly transformed according to the following formula:
The method is characterized in that the method comprises the following steps of:
In creating a transformer-based low frequency equivalent model,
Receiving synchronous frequency hopping signals from a plurality of local circuits 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 window short-time Fourier transform on M paths of discrete time domain mixed signals to obtain a time-frequency domain matrix of M mixed signalsFor the obtained frequency hopping mixed signal time-frequency domain matrixPretreating;
The reduced order small signal mathematical model is: the section where the doppler shift of the fractional reduced small signal blurring function of the digital modulated signal MASK, MFSK, MPSK is zero is expressed as:
the fractional lower order ambiguity function of the digital modulation signal x (t) of the voltage sensor and the current sensor is expressed as:
Where τ is the delay offset, f is the Doppler shift, 0< a, b < α/2, x * (t) represents the conjugate of x (t), x (t) ＜p＞＝|x(t)|＜p＞ sgn (x (t)) when x (t) is the real signal; 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 utilization of 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 bi-directional power conversion AC-DC control system provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a monitoring device according to an embodiment of the present invention;
In the figure: 1. an access terminal; 2. the first high-voltage starting switch tube; 3. a circuit control terminal; 4. a current source; 5. The second high-voltage starting switch tube; 6. monitoring equipment; 7. a connection terminal; 8. an upper switch group; 9. an isolator; 10. a control system; 11. a controllable switch; 12. a power 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. a current sensor.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in 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, and after the access end is accessed with current, the current source is controlled by direct current through the circuit control end;
Establishing a low-frequency equivalent model based on a transformer on the basis of dq coordinate transformation of a local circuit, and giving out steady-state characteristic analysis;
meanwhile, a reduced order small signal mathematical model is established to control the AC-DC system;
the control system adopts an external voltage loop to control output voltage, and an internal current loop to control input current, so as to correct unit power factor;
the running state of the real-time monitoring system is monitored through the voltage sensor, the temperature sensor and the current sensor, and the running state is displayed through the display screen.
The structure of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 2, the bi-directional power conversion AC-DC control system and control method based on IGBT according to the embodiment of the invention include: the switching device comprises an access terminal 1, a first high-voltage starting switch tube 2, a circuit control terminal 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 terminal 1 is used for connecting an external high-voltage line group and is connected with the first high-voltage starting switch tube 2 through a lead; the first high-voltage starting switch tube 2 is connected with the circuit control end 3 in a linear manner; the circuit control end 3 is connected with the 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 connected with each other in a linear manner through wires; the wiring terminal 7 is fixedly connected with the upper switch group 8;
An isolator 9 is connected to the rear of the upper switch group 8; the isolator 9 is connected with a control system 10; a controllable switch 11 is connected between the control system 10 and the power supply module 12; the lower switch group 14 is linearly connected with the three-phase inverter 15; the diode group 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 LCL+IGBT structure, after the access terminal 1 is accessed with current, the circuit control terminal 3 is used, the current source 4 adopts a direct current control method, the high-efficiency control method can bring a more stable system, a low-frequency equivalent model based on a transformer is established on the basis of dq coordinate transformation of a local circuit, steady state characteristic analysis is given, and a reduced order small signal mathematical model is established, so that the mathematical model of the AC-DC system is clearer, and the clear mathematical model is crucial for realizing the control of the AC-DC system. The AC-DC system adopts an 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 loop and current inner loop double closed loop system, the voltage outer loop controls the output voltage, and the current inner loop controls the input current, so that the correction of the unit power factor is realized; the upper switch group 8 and the lower switch group 14 respectively protect the output of current, when an emergency occurs, the controllable switch 11 can control the power supply module 12 to protect, the voltage sensor 18, the temperature sensor 19 and the current sensor 20 can monitor the running state of the system in real time, and the running state is displayed through the display screen 17.
The invention is further described in connection with specific analysis.
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 the current is accessed to an access end;
Establishing a low-frequency equivalent model based on a transformer on the basis of dq coordinate transformation of a local circuit, and analyzing steady-state characteristics;
meanwhile, a reduced order small signal mathematical model is established to control the AC-DC system;
the control system adopts an outer voltage loop to control output voltage and an inner current loop to control input current, so as to correct unit power factor;
the running state of the real-time monitoring system is monitored through the voltage sensor, the temperature sensor and the current sensor, and the running state is displayed through the display screen.
The method for controlling the current by the circuit control terminal comprises the following steps:
the received current signal s (t) is non-linearly transformed according to the following formula:
Wherein the method comprises the steps of A represents the amplitude of the signal, a (m) represents the symbol sign of the signal, p (t) represents the shaping function, f c represents the carrier frequency of the signal,Representing the phase of the signal, and obtaining after the nonlinear transformation:
The method for establishing the low-frequency equivalent model based on the transformer comprises the following steps:
Step one, receiving synchronous frequency hopping signals from a plurality of local circuits 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 signals m＝1,2,…,M；
Step two, performing short-time Fourier transform of a overlap window on M paths of discrete time domain mixed signals to obtain a time-frequency domain matrix of M mixed signalsP=0, 1, …, P-1, q=0, 1, …, N fft -1, where P represents the total window number, N fft represents the FFT transform length (P, q) represents the time-frequency index, the specific time-frequency value isWhere N fft denotes the length of the FFT transform, p denotes the number of times of windowing, T s denotes the sampling interval, f s denotes the sampling frequency, C is an integer, C is the number of sampling points for the short-time Fourier transform windowing interval, C < N fft, and K c＝Nfft/C is an integer, that is, the short-time Fourier transform with overlapping windows is employed;
Step three, the obtained time-frequency domain matrix of the frequency hopping mixed signal Pretreating; comprising the following steps:
First step, for Low energy removal preprocessing, i.e. at each sampling instant p, willSetting the value with the amplitude 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;
second, find out the non-zero time-frequency domain data of P time (p=0, 1,2, … P-1) using Representation, whereinRepresents the time-frequency responseNormalizing the non-zero data by the corresponding frequency index when the data is not 0 to obtain a preprocessed vector b (p, q) = [ b 1(p,q),b2(p,q),…,bM(p,q)]T ], wherein
The reduced order small signal mathematical model is:
the section where the doppler shift of the fractional reduced small signal blurring function of the digital modulated signal MASK, MFSK, MPSK is zero is expressed as:
Wherein, Is a gate function of width T b - τ;
only the three parts are Is different in the coefficient of MASK signalNot always 1; of MFSK signalsNot always 1; for a 2ASK signal, a n = 0,1; for a 4ASK signal, a n =0, 1,2,3, two signalsDifferent, the section profile with zero Doppler frequency shift of the reduced order small signal blurring function is also different; for a 2FSK signal, f m = - Δf, Δf; for a 4FSK signal, f m = -3 Δf, - Δf,3 Δf, two signalsThe profile of a tangent plane with zero doppler shift for the reduced order small signal blur function is different.
Further, the fractional lower order ambiguity function of the digital modulation signal x (t) of the voltage sensor and the current sensor is expressed as:
Where τ is the delay offset, f is the Doppler shift, 0< a, b < α/2, x * (t) represents the conjugate of x (t), x (t) ＜p＞＝|x(t)|＜p＞ sgn (x (t)) when x (t) is the real signal; 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)
Where x i (T) is each signal component of the time-frequency overlapped signal, each component signal is independent and uncorrelated, n is the number of time-frequency overlapped signal components, θ ki represents modulation of carrier phases of each signal component, f ci is carrier frequency, a ki is amplitude of the ith signal at k time, and T si is symbol length.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in whole or in part, the use is in the form of a computer program product comprising one or more computer instructions. When the computer program instructions are loaded or executed on a computer, the processes or functions in accordance with embodiments of the present invention are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk Solid STATE DISK (SSD)), etc.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical principles of the present invention fall within the scope of the technical solutions of the present invention.
Claims (9)
1. The IGBT-based bidirectional power conversion AC-DC control method is characterized by comprising the following steps of:
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 the current is accessed to an access end;
Establishing a low-frequency equivalent model based on a transformer on the basis of dq coordinate transformation of a local circuit, and analyzing steady-state characteristics;
meanwhile, a reduced order small signal mathematical model is established to control the AC-DC system;
the control system adopts an outer voltage loop to control output voltage and an inner current loop to control input current, so as to correct unit power factor;
the running state of the real-time monitoring system is monitored through a voltage sensor, a temperature sensor and a current sensor, and the running state is displayed through a display screen;
The method for establishing the low-frequency equivalent model based on the transformer comprises the following steps:
step one, receiving synchronous frequency hopping signals from a plurality of local circuits 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 signals
Step two, performing short-time Fourier transform of a overlap window on M paths of discrete time domain mixed signals to obtain a time-frequency domain matrix of M mixed signalsWhere P represents the total window number, N fft represents the FFT transform length (P, q) represents the time-frequency index, and the specific time-frequency value isHere, the
N fft represents the length of FFT transformation, p represents the number of times of windowing, T s represents the sampling interval, f s represents the sampling frequency, C is an integer, the number of sampling points representing the short-time Fourier transform windowing interval is less than N fft, and K c＝Nfft/C is an integer, that is, overlapping windowed short-time Fourier transforms are adopted;
Step three, the obtained time-frequency domain matrix of the frequency hopping mixed signal Pretreating; comprising the following steps:
First step, for Performing a de-low energy pre-processing, i.e. at each sampling instant p, the method comprisesSetting the value with the amplitude 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;
second, find out the non-zero time-frequency domain data of P time (p=0, 1,2, … P-1) using Representation, whereinRepresents the time-frequency responseNormalizing the non-zero data by the corresponding frequency index when the data is not 0 to obtain a preprocessed vector b (p, q) = [ b 1(p,q),b2(p,q),…,bM(p,q)]T ], wherein
2. The bi-directional power conversion AC-DC control method based on an IGBT of claim 1, wherein the method for current control at the circuit control terminal comprises:
the received current signal s (t) is non-linearly transformed according to the following formula:
Wherein the method comprises the steps of A represents the amplitude of the signal, a (m) represents the signal
Symbol symbols, p (t) denotes the shaping function, f c denotes the carrier frequency of the signal,Representing the phase of the signal, obtained by this nonlinear transformation:
3. 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 where the doppler shift of the fractional reduced small signal blurring function of the digital modulated signal MASK, MFSK, MPSK is zero is expressed as:
Wherein, Is a gate function of width T b - τ;
the above three formulas only have different coefficients of gh- (t-nT-) and MASK signals Not always 1; />, of MFSK signalsNot always 1; for a 2ASK signal, a n = 0,1; for a 4ASK signal, a n =0, 1,2,3, two signalsDifferent, the section profile with zero Doppler frequency shift of the reduced order small signal blurring function is also different; for a 2FSK signal, f m = - Δf, Δf; for a 4FSK signal, f m = -3 Δf, - Δf,3 Δf, two signalsThe profile of a tangent plane with zero doppler shift for the reduced order small signal blur function is different.
4. The IGBT-based bi-directional power conversion AC-DC control method according to claim 1, characterized in that the fractional lower order fuzzy function of the digital modulation signal x (t) of the voltage sensor and the current sensor is expressed as:
where τ is the delay offset, f is the Doppler shift, 0 < a, b < α/2, x * (t) represents the conjugate of x (t), x (t) ＜p＞＝|x(t)|＜p＞ sgn (x (t)) when x (t) is the real signal; 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)
Where x i (T) is each signal component of the time-frequency overlapped signal, each component signal is independent and uncorrelated, n is the number of time-frequency overlapped signal components, θ ki represents modulation of carrier phases of each signal component, f ci is carrier frequency, a ki is amplitude of the ith signal at k time, and T si is symbol length.
5. A computer program product, characterized in that the computer program product, when run, performs the IGBT-based bi-directional power conversion AC-DC control method according to any of claims 1 to 4.
6. A terminal 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 4.
7. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the IGBT-based bi-directional power conversion AC-DC control method according to any one of claims 1 to 4.
8. A control system for implementing the IGBT-based bi-directional power conversion AC-DC control method of claim 1, characterized in that the IGBT-based bi-directional power conversion AC-DC control system is provided with:
An access terminal;
The access end is used for connecting an external high-voltage line group and is connected with the first high-voltage starting switch tube through a lead; 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 pipeline connection with the second high-voltage starting switch; the monitoring device comprises a display screen, a voltage sensor, a temperature sensor and a current sensor which are connected with each other in a linear manner through wires;
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 connected with the three-phase inverter linearly;
the diode group is located at the leftmost side of the device.
9. An AC-DC-AC electric drive apparatus incorporating the IGBT-based bi-directional power conversion AC-DC control system of claim 8.
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