Method for optimizing dynamic performance of doubly salient electro-magnetic motor under power control of super capacitor

Abstract

A dynamic performance optimization method for an electro-magnetic doubly salient motor based on super capacitor power control comprises the following steps: firstly, collecting data of current, winding internal resistance and rotor position of the electro-magnetic doubly salient generator, and calculating bus voltage; thirdly, the relation between an energy storage medium and output power is established according to known data, the power of a direct-current bus serves as a control target in power control, a bus current reference value is calculated through a bus voltage reference value and real-time resistance, and then a reference value of bus power is obtained; the actual value of the power on the bus is obtained through the detected actual DC bus voltage and bus current, and the two values are used as the input of a power outer loop PI controller of the super capacitor energy storage system. On the basis of PID double-closed-loop control of the doubly salient electro-magnetic generator, accurate adjustment of bus voltage is realized through a power control method of a super-capacitor energy storage system. According to the method, the dynamic performance of the motor under the working conditions of instantaneous load change, power grid fluctuation and the like can be remarkably improved, and the reliability and anti-disturbance capability of the system are enhanced.

Description

Technical Field

[0001] The present invention belongs to the field of motor drive and control, and specifically relates to a method for optimizing the dynamic performance of an electro-excited doubly salient machine with supercapacitor power control. Background Art

[0002] The aviation industry emits over 900 million metric tons of carbon dioxide every year. With the growing development of the air transportation market, carbon dioxide emissions will also increase accordingly. As the popularity of electric vehicles rises, greenhouse gas emissions from ground transportation are gradually decreasing. Therefore, the phenomenon of environmental pollution by air traffic is further highlighted. The continuous growth of air traffic volume, the need to meet the demands of the times for aviation performance, and the need to reduce operation and maintenance costs have all prompted the aviation industry to iterate towards a more electric direction.

[0003] The doubly salient electromagnetic machine (DSEM) has become the research and development direction of the main power supply for more electric aircraft. According to the functions and achieved effects of the electro-excited doubly salient machine, it can be divided into an electro-excited doubly salient motor and an electro-excited doubly salient generator; when used as a generator, common rectification methods include uncontrolled rectification (Diode Rectifier, DR) and controlled rectification. The uncontrolled rectifier bridge has a simple structure, does not require a position sensor, is small in size, and has a high power density; it has a better application prospect for an aviation power generation system that requires high reliability.

[0004] With the development of the times, more electric aircraft adopt a motor drive device with a power converter as a constant power load (CPL), so higher requirements are also put forward for the dynamic performance of the aircraft. Due to the unidirectional energy flow of the system and the energy feedback characteristics of the CPL, when suddenly adding or removing a load, it will cause fluctuations in the grid voltage and affect some electrical equipment. Therefore, it is very important to add an energy storage system in more electric aircraft to regulate the grid voltage, ensure the power balance between the electrical load and the generator, and optimize the dynamic performance of more electric aircraft. Compared with traditional batteries, supercapacitors (SCs) have characteristics such as high power density and long cycle life. They can release a large amount of electricity in a short time and stabilize the grid voltage to the effective value in a very short time. By establishing a supercapacitor energy storage system in the grid and adopting effective methods to control the stability of the system, the goal of improving the dynamic performance of more electric aircraft can be achieved.

[0005] At present, the application and research of supercapacitors in the power generation field of more-electric aircraft are still in the exploratory stage. Using the characteristics of supercapacitors to improve the dynamic performance of electrically excited double-pole generators is of great significance to the research and exploration of future aviation power generation systems. This application is expected to improve the stability and response speed of the power generation system during high-speed flight or rapid load changes, thereby improving the reliability and efficiency of the entire aviation power system and promoting the future aviation power system to develop in a more efficient direction.

[0006] Compared with the prior art, the differences are as follows:

[0007] Technical comparison with patent CN115800842A "De-excitation fault-tolerant power generation control method for electrically excited double-salient-pole motor with optimized dynamic performance"

[0008] Patent CN115800842A proposes a method for controlling the demagnetization fault-tolerant power generation of an electrically excited double-pole motor with optimized dynamic performance, aiming to improve the dynamic performance of the system during demagnetization power generation. This patent proposes a method for optimizing the dynamic performance of an electrically excited double-pole motor with supercapacitor power control, aiming to improve the dynamic performance of normal power generation by controlling the supercapacitor energy storage system based on the electrically excited double-pole motor. There is an essential difference between the technical goals of the two.

[0009] Patent CN115800842A uses the output current regulation amount of the voltage loop PI regulator as error regulation, and designs a feedforward control to output the feedforward current to complete the control of the electrically excited double-pole motor power generation; this patent establishes a supercapacitor energy storage system in the electrically excited double-pole motor power generation system, and realizes precise regulation of the bus voltage through the power control method of the supercapacitor energy storage system. There is an essential difference between the technical ideas of the two.

[0010] Patent CN115800842A uses the voltage loop PI regulator to output the current regulation as the error regulation, and introduces the feedforward control to output the feedforward current, which is an improvement in the control method; this patent uses the control method of building the power outer loop based on the real-time changing resistance and current, which is a control design and development. There is an essential difference between the two at the control level. Summary of the invention

[0011] In view of the above problems, the present invention proposes a dynamic performance optimization method for an electrically excited double-pole motor controlled by a supercapacitor power. By introducing the proposed supercapacitor energy storage system and the PID control algorithm of the power outer loop-current inner loop, the dynamic response capability and stability of the motor are improved, especially in an environment where the load changes drastically and the voltage fluctuates greatly. The bus voltage change can be effectively suppressed to ensure the efficient operation of the motor under various working conditions.

[0012] To achieve the above object, the technical solution adopted by the present invention is:

[0013] Optimization method for dynamic performance of electro-excited doubly salient motor with supercapacitor power control, comprising the following steps:

[0014] (S1) Detect parameter data of the current, winding internal resistance and rotor position of the electro-excited doubly salient generator, establish a mathematical model of the electro-excited doubly salient motor, and calculate the proportional coefficient k p , integral coefficient k i , and differential coefficient k d of the voltage outer loop-excitation current inner loop closed-loop control system of the electro-excited doubly salient generator through the given values and reference values of the bus voltage and excitation current;

[0015] (S2) Based on the known fluctuations of the bus voltage and excitation current, the real-time changing resistance can be calculated according to the real-time changing bus voltage and bus current values, and then the given bus current value can be obtained between the reference value of the known bus voltage and the obtained resistance value according to Ohm's law;

[0016] (S3) Take the power of the DC bus in the power outer loop control as the control target. Calculate the current reference value through the voltage reference value and the real-time resistance, and then obtain the power reference value;

[0017] (S4) Pass the actual power value and the given power value through the outer loop PI controller to obtain the current given value of the supercapacitor energy storage system, and then use pulse width modulation as the control signal of the bidirectional DC / DC switch tube to control the charge and discharge of the energy storage circuit;

[0018] (S5) Through the power outer loop-current inner loop PID control method for the drive signal of the bidirectional DC / DC converter of the supercapacitor energy storage system, combined with the control of the uncontrolled rectification of the electro-excited doubly salient motor, reduce the bus voltage fluctuation during load addition and removal, and improve the dynamic performance of the system.

[0019] As a further improvement of the present invention, the step (S1) specifically includes the following steps:

[0020] (S11) According to the electromagnetic induction law and Kirchhoff's voltage law, the winding terminal voltage equation can be obtained:

[0021]

[0022] Among them, u a , u b , u c , r a , r b , r c , i a , i b , i cψa, ψb, and ψc are the terminal voltages, internal resistances, currents, and magnetic fluxes of the armature windings of phases A, B, and C respectively, uf, rf, if, and ψf are the terminal voltage, internal resistance, current, and magnetic flux of the excitation winding respectively, t is time, and d is the differential operator;

[0023] (S12) According to the characteristics of the doubly salient electro-magnetic motor, the magnetic fluxes of the armature winding and the excitation winding are expressed as:

[0024]

[0025] In the formula, L xx refers to the self-inductance of the winding, L xy and L yx refer to the mutual inductance of the windings, and L xy = L yx ;

[0026] (S13) The asymmetrical half-bridge converter drives the excitation winding to generate an excitation current. According to the bus voltage outer loop - excitation current inner loop control loop, the reference values of the closed-loop bus voltage and the excitation current of the doubly salient electro-magnetic motor are derived, and the output of the outer loop is used as the given value of the excitation current inner loop:

[0027]

[0028] Among them, Sv represents the integral operation of the bus voltage error, u ref is the reference value of the bus voltage, i fref is the reference value of the excitation current, k pv and k iv are the proportional coefficient and the integral coefficient of the voltage outer loop PI controller;

[0029] (S14) According to the control operation of the voltage outer loop - excitation current inner loop, the duty ratio of the power electronic device in the AHB is calculated:

[0030]

[0031] Among them, k pi is the proportional coefficient of the current inner loop, k ii is the integral coefficient of the current inner loop, and k di is the differential coefficient of the current inner loop.

[0032] As a further improvement of the present invention, the step (S2) specifically includes the following steps:

[0033] (S21) The given value of the bus current in the power outer loop of the supercapacitor energy storage system is:

[0034]

[0035] Among them, u dcrefis the given voltage value on the busbar, i dcref is the given current value on the busbar, R rt is the real-time resistance value on the busbar.

[0036] (S22) The R rt value can be calculated by the following formula:

[0037]

[0038] where, u dc is the actual voltage value on the busbar, i dc is the actual current value on the busbar.

[0039] (S23) Substitute the implementation resistance value obtained from the actual busbar voltage and current in equation (6) into equation (5):

[0040]

[0041] As a further improvement of the present invention, the specific steps of the step (S3) are as follows:

[0042] (S31) According to the power calculation formula, the given value of the power outer loop can be obtained as:

[0043]

[0044] where, P dcref is the given value of the busbar power;

[0045] (S32) Substitute equation (7) into equation (8) to obtain the given value of the power outer loop with only one voltage given value:

[0046]

[0047] As a further improvement of the present invention, the specific steps of the step (S4) are as follows:

[0048] (S41) The output of the power outer loop PI controller is the given value of the supercapacitor inductor current, where:

[0049]

[0050] In the formula, S p is the integral operation of the busbar power error, k pp 、k ip are the proportional coefficient and integral coefficient of the power outer loop PI controller, i ref is the given value of the current inner loop of the supercapacitor energy storage system.

[0051] As a further improvement of the present invention, the specific steps of the step (S5) are as follows:

[0052] (S51) In the asymmetrical H-bridge, one of the two switching tubes is always conducting, and the other is controlled by a drive signal for its duty cycle, so that the exciting current can be stabilized at a specific value;

[0053] (S52) When setting the reference value u of the bus voltage outer loop ref , the error value passes through the PID controller of the doubly salient electro-magnetic generator system and then outputs the reference value i of the exciting current fref ;

[0054] (S52) Through the reference value u of the bus voltage outer loop ref and the reference value i of the bus current calculated by the bus resistance, the reference value P of the bus power is obtained according to the power formula ref , the error value of the power passes through the PID controller of the supercapacitor system and then outputs the reference value i of the current ref , and finally the difference is output to the switching tubes through the PI controller to control the charge and discharge of the supercapacitor according to the change of the outer loop; ref

[0055] (S53) According to the signal adjusted by the doubly salient electro-magnetic motor, and further adjusted according to the power outer loop - current inner loop of the supercapacitor energy storage system, finally a pulse signal for controlling the converter is generated.

[0056] As a further improvement of the present invention, the doubly salient electro-magnetic motor power generation system based on the supercapacitor energy storage system is composed of an exciting current source, an asymmetrical H-bridge, a rectifying circuit, a filtering circuit load, a control circuit, an energy storage circuit and a power grid. The main control loop collects the output voltage and exciting current of the main circuit. On the basis of the main control loop, the energy storage control loop generates a modulation signal through a power outer loop - current inner loop double-loop controller, and finally generates a pulse signal for controlling the converter.

[0057] Beneficial effects:

[0058] 1. Compared with the traditional doubly salient electro-magnetic voltage outer loop - exciting current inner loop control, the power outer loop - current inner loop of the supercapacitor energy storage system and the voltage outer loop - exciting current inner loop of the doubly salient electro-magnetic motor proposed by the present invention are cooperatively controlled. The supercapacitor energy storage system can better adapt to the change of the load current. Provide or absorb additional electric energy for the load during instantaneous load changes, reduce the bus voltage fluctuation, and ensure the efficient operation of the motor under various working conditions.

[0059] 2. The dynamic performance optimization method proposed by the present invention does not need to control the rectifying part of the doubly salient electro-magnetic motor, and does not need to consider the influence of the on-off of the switching tubes on the circuit, reducing the complexity of the circuit and being convenient for specific implementation. Description of the drawings

[0060] Figure 1 ​Block diagram of the dynamic performance optimization method of the electro - excited doubly salient motor based on super - capacitor proposed by the present invention;

[0061] Figure 2 Block diagram of the electro - excited doubly salient power generation system with a super - capacitor energy storage system, including an asymmetrical H - bridge, an uncontrolled rectifier circuit, a control circuit, and an SC energy storage system;

[0062] Figure 3 Comparison of the bus voltage when suddenly removing the load at 5000 r / min;

[0063] Figure 4 Comparison of the bus voltage when suddenly adding the load at 5000 r / min. Specific implementation manners

[0064] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0065] The present invention discloses a dynamic performance optimization method of an electro - excited doubly salient motor based on a super - capacitor power outer - loop control method. Next, the technical content of the present invention will be further described in detail in conjunction with the accompanying drawings.

[0066] A dynamic performance optimization method of an electro - excited doubly salient motor based on a super - capacitor power outer - loop control method of the present invention is as Figure 1 shown. According to the characteristics and relevant laws of the electro - excited doubly salient and motor, the winding terminal voltage equation, the magnetic fluxes of the armature winding and the field winding can be obtained. Selected by the bus voltage and the field current, the k p 、k i 、k d of the PID are used as the closed - loop reference values of the electro - excited doubly salient generator, and the duty ratio of the power electronic devices in the AHB is calculated; when the load is suddenly added or removed in the DSEG power generation system, the field current will also change according to the change of the load on the bus, and the load current will also change accordingly. The real - time changing resistance can be calculated through the real - time changing bus voltage and bus current values. Then, according to Ohm's law, the given bus current value can be obtained between the reference value of the bus voltage and the obtained resistance value. Finally, the power is calculated through the reference values of the bus voltage and the bus current as the power outer - loop of the super - capacitor energy storage system, thereby suppressing the change of the bus voltage.

[0067] As Figure 2 shown is the block diagram of the electro - excited doubly salient power generation system with a super - capacitor energy storage system. Through the research on the dynamic performance optimization method of the electro - excited doubly salient motor based on super - capacitor, the bus voltage can be stabilized when the load is suddenly added or removed. The specific steps are as follows:

[0068] (a) Winding terminal voltage equation:

[0069]

[0070] Among them, u a 、u b 、u c , r a , r b , r c , i a , i b , i c and ψa, ψb, ψc are the terminal voltages, internal resistances, currents, and magnetic fluxes of the armature windings of phases A, B, and C respectively. uf, rf, if, and ψf are the terminal voltage, internal resistance, current, and magnetic flux of the field winding respectively. t is time, and d is the differential operator.

[0071] (b) According to the characteristics of the doubly salient electro-magnetic motor, the magnetic fluxes of the armature winding and the field winding can be expressed as:

[0072]

[0073] Among them, L x refers to the self-inductance of the winding, L xy and L yx refer to the mutual inductance of the windings, and L xy = L yx .

[0074] (c) The instantaneous power of the motor can be expressed as:

[0075]

[0076] Among them, p e is the instantaneous power of the motor, θ m is the mechanical angle of the rotor, T e is the electromagnetic torque of the motor, ω m is the mechanical angular velocity of the rotor, and p Cu is the instantaneous copper loss of the motor.

[0077] (d) According to the bus voltage outer loop - field current inner loop control loop, the closed-loop reference value of the doubly salient electro-magnetic motor is derived, and the output of the outer loop is used as the given value of the field current inner loop:

[0078]

[0079] Among them, Sv represents the integral operation of the bus voltage error, u ref is the reference value of the bus voltage, i fref is the reference value of the field current, and k pv and k iv are the proportional coefficient and integral coefficient of the voltage outer loop PI controller.

[0080] (e) The given value of the bus current in the power outer loop of the supercapacitor energy storage system is:

[0081]

[0082] Where, u dcref is the given voltage value on the bus, i dcref is the given current value on the bus, and R rt is the real-time resistance value on the bus.

[0083] (f) The value of R rt can be calculated by the following formula:

[0084]

[0085] Where, u dc is the actual voltage value on the bus, and i dc is the actual current value on the bus.

[0086] (g) Substitute the actual resistance value obtained from the actual bus voltage and current in Equation (6) into Equation (5):

[0087]

[0088] (h) According to the power calculation formula, the given value of the power outer loop can be obtained as:

[0089]

[0090] Where, P dcref is the given value of the bus power.

[0091] (i) Substitute Equation (7) into Equation (8) to obtain the given value of the power outer loop with only one voltage given value:

[0092]

[0093] (j) The output of the power outer loop PI controller is the given value of the supercapacitor inductor current, where:

[0094]

[0095] In the formula, S p is the integral operation of the bus power error, k pp , k ip are the proportional coefficient and integral coefficient of the power outer loop PI controller, and i ref is the given value of the current inner loop of the supercapacitor energy storage system.

[0096] (k) The energy storage unit compensates for the differential power to generate a rapid DC grid voltage regulation, and the compensation power value:

[0097]

[0098] Among them, P comp is the compensation power; P load is the load power, and f SOC is the deviation coefficient.

[0099] As Figure 3 shown is the comparison of the bus voltage under the conditions of sudden load addition and sudden load removal of the system at 5000 r / min. The bus voltage is stable at 270 V before 38 ms, and its load is 6 kW. At 38 ms, the load is suddenly unloaded to 1 kW, and at this time the bus load is 6 kW. Voltage rises occur in both control methods. Among them, the voltage of PID control rises to 304.6 V and reaches the steady state at 130 ms, taking 92 ms; while for the control method with SC power outer loop - current inner loop added, the voltage rises to 279.8 V, and the bus voltage is re - stabilized at 270 V only in 76 ms, taking 38 ms. The recovery time and voltage fluctuation are reduced by 24.8 V, and the recovery time is shortened by 54 ms.

[0100] As Figure 4 shown is the comparison of the bus voltage under the conditions of sudden load addition and sudden load addition of the system at 5000 r / min. The bus voltage is stable at 270 V before 50 ms, and its load is 1 kW. At 50 ms, the load is suddenly increased to 6 kW, and at this time the bus load is 6 kW. Voltage drops occur in both control methods. Among them, the voltage of PID control drops to 261.2 V and reaches the steady state at 101 ms, taking 51 ms; while for the control method with SC power outer loop - current inner loop added, the voltage drops to 263.5 V, and the bus voltage is re - stabilized at 270 V only in 79 ms, taking 29 ms. The recovery time and voltage fluctuation are reduced by 2.3 V, and the recovery time is shortened by 50 ms, greatly improving the dynamic performance.

[0101] The above - mentioned are only the preferred embodiments of the present invention, and are not any other form of limitation to the present invention. Any modification or equivalent change made according to the technical essence of the present invention still belongs to the scope protected by the present invention.

Claims

1. A method for optimizing the dynamic performance of an electrically excited double-salient-pole motor controlled by supercapacitor power, characterized in that: The following steps are involved: (S1) Detecting the parameter data of the electric excitation double-pole generator current, winding internal resistance and rotor position, establishing a mathematical model of the electric excitation double-pole generator, and calculating the proportional coefficient k of the voltage outer loop-excitation current inner loop closed-loop control system of the electric excitation double-pole generator through the given values ​​and reference values ​​of the bus voltage and excitation current p , integration coefficient k i , and the differential coefficient k d Three control variables; (S2) by using the known bus voltage and excitation current fluctuations, the real-time changing resistance can be calculated according to the real-time changing bus voltage and bus current values, and then according to Ohm's law, a given bus current value is obtained between the known bus voltage reference value and the obtained resistance value; (S3) The power of the DC bus in the power outer loop control is taken as the control target. The current reference value is calculated through the voltage reference value and the real-time resistance, and then the power reference value is obtained; (S4) The actual power value and the power set value are passed through an outer loop PI controller to obtain a current set value of the supercapacitor energy storage system, and then pulse width modulation is used as a control signal of a bidirectional DC / DC switch tube to control the charging and discharging of the energy storage circuit; (S5) Through the power outer loop-current inner loop PID control method of the bidirectional DC / DC converter drive signal of the supercapacitor energy storage system, combined with the control of the uncontrolled rectification of the electrically excited double-pole motor, the bus voltage fluctuation during load addition and reduction is reduced, and the dynamic performance of the system is improved.

2. The method for optimizing dynamic performance of an electrically excited double-salient-pole motor controlled by supercapacitor power according to claim 1, characterized in that: The step (S1) specifically comprises the following steps: (S11) According to the law of electromagnetic induction and Kirchhoff's voltage law, the voltage equation at the winding end can be obtained: Among them, u a 、u b 、u c , r a 、r b 、r c ,i a 、i b 、i c and ψa, ψb, ψc are the terminal voltage, internal resistance, current and flux linkage of the armature winding of phases A, B and C respectively, uf, rf, if, ψf are the terminal voltage, internal resistance, current and flux linkage of the field winding respectively, t is time, d is the differential operator; (S12) According to the characteristics of the electric excitation double convex and the motor, the flux linkage of the armature winding and the field winding is expressed as: Where, L xx Refers to the winding self-inductance, L xy and L yx Refers to the mutual inductance of the winding, and L xy =L yx ; (S13) The asymmetric half-bridge converter drives the excitation winding to generate an excitation current. According to the bus voltage outer loop-excitation current inner loop control loop, the reference values ​​of the closed-loop bus voltage and excitation current of the electrically excited doubly salient-pole motor are derived, and the output of the outer loop is used as a given value of the excitation current inner loop: Among them, Sv represents the integration operation of the bus voltage error, u ref is the reference value of bus voltage, i fref is the reference value of the excitation current, k pv and k iv are the proportional coefficient and integral coefficient of the voltage outer loop PI controller; (S14) According to the control operation of the voltage outer loop-excitation current inner loop, the duty cycle of the power electronic device in the AHB is calculated: Among them, k pi is the current inner loop proportionality coefficient, k ii is the current inner loop integral coefficient, k di is the current inner loop differential coefficient.

3. The method for optimizing dynamic performance of an electrically excited double-salient-pole motor controlled by supercapacitor power according to claim 1, characterized in that: The step (S2) specifically comprises the following steps: (S21) The given value of the bus current in the power outer loop of the supercapacitor energy storage system is: Among them, u dcref is the given voltage value on the bus, i dcref is the given current value on the bus, R rt It is the real-time resistance value on the busbar. (S22)R rt The value can be calculated by the following formula: Among them, u dc is the actual voltage value on the bus, i dc is the actual current value on the bus. (S23) Substitute the actual resistance value obtained from the actual bus voltage and current in formula (6) into formula (5):

4. The method for optimizing dynamic performance of an electrically excited double-salient-pole motor controlled by supercapacitor power according to claim 1, characterized in that: The specific steps of step (S3) are as follows: (S31) According to the power calculation formula, the given value of the power outer loop is: Among them, P dcref is the given value of bus power; (S32) Substituting equation (7) into equation (8) yields the given value of the power outer loop with only one voltage given value:

5. The method for optimizing dynamic performance of an electrically excited double-salient-pole motor controlled by supercapacitor power according to claim 1, characterized in that: The specific steps of the step (S4) are as follows: (S41) The output of the power outer loop PI controller is a given value of the supercapacitor inductor current, where: In the formula, S p is the integration operation of the bus power error, k pp , k ip is the proportional coefficient and integral coefficient of the power outer loop PI controller, i ref is the given value of the inner current loop of the supercapacitor energy storage system.

6. The method for optimizing dynamic performance of an electrically excited double-salient-pole motor controlled by supercapacitor power according to claim 1, characterized in that: The specific steps of the step (S5) are as follows: (S51) In the asymmetric H-bridge, one of the two switches is always turned on, and the duty cycle of the other is controlled by a driving signal, so that the excitation current can be stabilized at a certain specific value; (S52) When setting the reference value u of the bus voltage outer loop ref The error value is passed through the PID controller of the electrically excited double-pole generator system to output the reference value of the excitation current i fref ; (S52) The reference value u of the bus voltage outer loop is ref The reference value of bus current calculated by bus resistance i ref , according to the power formula, the reference value of bus power P is obtained ref , the power error value is passed through the PID controller of the supercapacitor system to output the reference value of the current i ref Finally, the PI controller makes a difference output to the switch tube to control the charging and discharging of the supercapacitor according to the changes in the outer loop; (S53) According to the signal of the electric excitation double-pole motor adjustment, further adjustment is performed according to the power outer loop-current inner loop of the supercapacitor energy storage system, and finally a pulse signal for controlling the converter is generated.

7. The method for optimizing dynamic performance of an electrically excited double-salient-pole motor controlled by supercapacitor power according to claims 1-6, characterized in that: The electrically excited doubly salient motor power generation system based on the supercapacitor energy storage system consists of an excitation current source, an asymmetric H-bridge, a rectifier circuit, a filter circuit load, a control circuit, an energy storage circuit and a power grid. The main control circuit collects the output voltage and excitation current of the main circuit. Based on the main control circuit, the energy storage control circuit generates a modulation signal through a power outer loop-current inner loop dual loop controller, and finally generates a pulse signal to control the converter.

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