CN115833697B - Asymmetric current control method of electro-magnetic doubly salient power generation system - Google Patents
Asymmetric current control method of electro-magnetic doubly salient power generation system Download PDFInfo
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Abstract
The application discloses an asymmetric current control method of an electro-magnetic doubly salient power generation system, which relates to the field of electro-magnetic doubly salient power generation systems, and is characterized in that when the method is used for controlling, for each sector of an electrical period, an upper bridge arm switching tube connected with a phase winding rising in a sector by self-inductance in a controllable rectifier is controlled to be conducted in advance of a gamma electrical angle before the beginning of the sector starting position of the sector, and is continuously conducted to be turned off at a beta electrical angle after the sector starting position of the sector; the lower bridge arm switching tube connected with the phase winding which is self-induced to descend in the sector is controlled to be conducted in the sector starting position of the sector, and is continuously conducted to be turned off at an alpha electrical angle after the sector starting position of the sector, and alpha > beta is controlled under the default condition, so that the conduction interval of the lower bridge arm switching tube flowing through forward current is fully increased, the forward current is increased, the power generation capacity of the electro-magnetic doubly salient generator can be further improved, and the output electric energy and the power density of the generator are improved.
Description
Technical Field
The application relates to the field of electro-magnetic doubly salient generators, in particular to an asymmetric current control method of an electro-magnetic doubly salient generator system.
Background
The electric excitation doubly salient generator is a variable reluctance motor, a rotor of the variable reluctance motor is not provided with windings and permanent magnets, and the magnetic field of the motor can be adjusted by adjusting the current on an excitation winding. The special structure enables the electro-magnetic doubly salient generator to have the advantages of simple structure, strong reliability, suitability for high rotation speed, severe working condition, capability of de-excitation under faults and the like.
The electric excitation doubly salient generator generally adopts an uncontrolled rectifier to generate power, but the uncontrolled rectification power generation system of the traditional electric excitation doubly salient generator has lower output power, so that the development of the controllable rectification power generation system of the electric excitation doubly salient generator is promoted. Because of the special salient pole structure of the electro-magnetic doubly salient generator, the induction potential of the motor is non-sinusoidal, so that the traditional vector control and magnetic field orientation control are not applicable.
The principle of a power generation system control strategy of the electro-magnetic doubly salient generator is that according to the simplified phase winding inductance change characteristics of the electro-magnetic doubly salient generator, a 360-degree electric period is equally divided into three 120-degree sectors, three-phase windings in each sector are respectively located in an inductance rising area, an inductance falling area and an inductance unchanged area according to the inductance change characteristics, alternate along with the change of the sectors, and are closed after switching tubes of corresponding bridge arms are conducted by each sector for a certain angle. The control strategy of the existing controllable rectifying power generation system of the electro-magnetic doubly salient generator mainly comprises a standard angle position control strategy, an advanced angle position control strategy, a six-state angle position control strategy, a three-phase six-beat control strategy and the like. Under a standard angle position control strategy, an upper bridge arm switching tube connected with a phase winding in an inductance rising region and a lower bridge arm switching tube connected with a phase winding in an inductance falling region are simultaneously conducted at a sector switching point, and the inductance unchanged region does not conduct the switching tube. The advanced angle position control strategy is based on a standard angle, and the upper bridge arm switch tube and the lower bridge arm switch tube which are required to be conducted are conducted simultaneously in advance of a certain angle of a sector switching point. For example, the invention patent with the application number of 202210296399.7 and the patent name of 'an electro-magnetic doubly salient power generation system three-phase six-beat control method' provides a method for advancing the opening angles of switching tubes of an upper bridge arm and a lower bridge arm by different angles on the basis of the advance angles.
However, the control strategies of the existing controllable rectifying power generation systems have the following problems: the conducting interval of the upper bridge arm switch tube through which the negative current flows is too long, the negative phase current value is too large, the negative-to-positive commutation time of the current during sector switching is prolonged, the problem of phase inversion overlapping of the generator is aggravated, and the output range of the positive current with stronger power generation capacity is shortened. The switching tubes of the upper bridge arm and the lower bridge arm corresponding to each sector are turned off simultaneously, the lower bridge arm is turned off too early, the forward current amplitude with larger output force is smaller, and the output electric energy and the power density of the electro-magnetic doubly salient generator cannot be fully improved.
Disclosure of Invention
Aiming at the problems and the technical requirements, the applicant provides an asymmetric current control method of an electro-magnetic doubly salient power generation system, and the technical scheme of the application is as follows:
asymmetric current control method of electro-magnetic doubly salient power generation system, wherein excitation voltage source U f Excitation winding L of electric excitation doubly salient generator connected through asymmetric half bridge f One end of a three-phase winding of the electro-magnetic doubly-salient generator is connected in star shape, the other end of the three-phase winding is connected with a load through a controllable rectifier, and two ends of the load are also connected with a direct-current side filter capacitor C in parallel dc The method comprises the steps of carrying out a first treatment on the surface of the The control module is connected with and controls the switching tube in the asymmetric half bridge and the switching tube in the controllable rectifier, and the asymmetric current control method executed by the control module comprises the following steps:
controlling the duty ratio of the switching tube in the asymmetric half bridge to perform closed-loop control on the exciting current on the exciting winding and according to the rotor electric angle theta e The switching of the switching tubes in the controllable rectifier is controlled such that for each sector of an electrical cycle:
an upper bridge arm switching tube connected with a phase winding rising in a sector is controlled to be conducted by an gamma electric angle in advance before the beginning of the sector starting position of the sector, and is turned off at a beta electric angle after the sector starting position of the sector is continuously conducted; a lower bridge arm switching tube connected with a phase winding which is self-induced to descend in a sector in a controllable rectifier is controlled to be conducted at a sector starting position of the sector, and the lower bridge arm switching tube is turned off at an alpha electrical angle after being continuously conducted to the sector starting position of the sector; and controlling the rest switching tubes in the controllable rectifier to be continuously kept off, wherein alpha, beta and gamma are all conduction angle parameters, and alpha is larger than beta.
The further technical proposal is that the method for determining the conduction angle parameters alpha, beta and gamma comprises the following steps:
determining working condition information of the electro-magnetic doubly salient power generation system, and determining a conduction angle combination corresponding to the working condition information in a conduction angle table, wherein the conduction angle combination comprises values of alpha, beta and gamma;
the conduction angle table comprises corresponding relations between different working condition information and conduction angle combinations, and the conduction angle combination corresponding to each working condition information is a conduction angle combination which enables the output power of the electro-magnetic doubly-salient power generation system to be maximum when the electro-magnetic doubly-salient power generation system operates under the operation working condition corresponding to the working condition information.
The further technical scheme is that the load is a resistive variable load, and the working condition information of the electro-magnetic doubly salient power generation system comprises the resistance value of the load R and the rotor rotating speed n of the electro-magnetic doubly salient power generator.
The further technical scheme is that the method for determining the working condition information of the electro-magnetic doubly salient power generation system comprises the following steps:
collecting direct current bus voltage U at two ends of load dc Load current i on load dc According to r=u dc /i dc Calculating the resistance R of the load and according to the rotor electrical angle theta e And calculating the change rate relative to time to obtain the rotor rotating speed n of the electro-magnetic doubly salient generator.
The further technical scheme is that the method for establishing the conduction angle table comprises the following steps:
controlling the electro-magnetic doubly salient power generation system to operate under an operation condition corresponding to a set of condition information, changing conduction angle combinations, determining output power of the electro-magnetic doubly salient power generation system under each conduction angle combination, and recording a corresponding relation between the conduction angle combination which enables the output power of the electro-magnetic doubly salient power generation system to be maximum and current condition information;
changing the working condition information and executing the step of controlling the electro-magnetic doubly salient power generation system to run under the running working condition corresponding to one set of working condition information again until the corresponding relation between each set of working condition information and the corresponding conduction angle combination is constructed, and establishing and obtaining a conduction angle table.
The further technical proposal is that the conduction angle parameter alpha takes the value in the electric angle interval of (0 degree, 120 degree), the conduction angle parameter beta takes the value in the electric angle interval of [0 degree, alpha), and the difference value between alpha and beta reaches the difference value threshold.
The further technical scheme is that the method for changing the conduction angle combination comprises the following steps:
selecting the value of a conduction angle parameter gamma;
sequentially traversing a plurality of different values of the selected conduction angle parameter alpha according to a first step in an electrical angle interval of (0 degree, 120 degree);
on the basis of unchanged values of the conduction angle parameter gamma and the conduction angle parameter alpha, sequentially traversing and selecting a plurality of different values of the conduction angle parameter beta according to a second step in an electric angle interval of [0 degrees alpha).
The further technical proposal is that in an asymmetric half bridge, a switching tube T 7 Is connected with an excitation voltage source U f Positive electrode of (C), switch tube T 7 Emitter-connected diode D 7 Cathode of diode D 7 Is connected with an excitation voltage source U f Is a negative electrode of (a); diode D 8 Is connected with an excitation voltage source U f Positive electrode of diode D 8 Anode connection switch tube T of (2) 8 Collector of (C), switch tube T 8 The emitter of (2) is connected with an excitation voltage source U f Is a negative electrode of (a); switch tube T 7 And a switching tube T 8 Two ends of the first diode are respectively connected with a reverse diode in parallel; switch tube T 7 Through exciting resistor R f Connecting excitation windings L f Is a field winding L f The other end of (2) is connected with a switch tube T 8 A collector electrode of (a);
the method for controlling the duty ratio of the switching tube in the asymmetric half bridge to carry out closed-loop control on the exciting current on the exciting winding comprises the following steps:
acquisition switch tube T 7 Is connected to the exciting resistor R f Exciting current i on the line of (2) f At a given current i fref And excitation current i f Takes the difference value of the output of the PI controller as the input of the PI controller, and controls the switching tube T according to the duty ratio corresponding to the output of the PI controller 7 And a switching tube T 8 Is provided.
The further technical proposal is that a three-phase bridge rectifier and a switch tube T are adopted as the controllable rectifier 1 Collector, switching tube T of (2) 3 Collector and switching tube T of (2) 5 The collector electrodes of the switch tube T are connected with one end of the load 1 Emitter-connected switching tube T 2 Collector of (C), switch tube T 3 Emitter-connected switching tube T 4 Collector of (C), switch tube T 5 Emitter-connected switching tube T 6 Collector of (C), switch tube T 2 Emitter, switch tube T of (2) 4 Emitter and switching tube T of (2) 6 The emitters of the two are connected with each other and the other end of the load;
switch tube T 1 The emitter of the (B) is connected with an A-phase winding of the electro-magnetic doubly salient generator, and a switching tube T 3 B-phase winding of electro-excited doubly salient generator is connected with an emitter of the electro-excited doubly salient generator, and a switching tube T 5 The emitter of the (a) is connected with a C-phase winding of the electro-magnetic doubly salient generator; switch tube T 1 Switch tube T 2 Switch tube T 3 Switch tube T 4 Switch tube T 5 And a switching tube T 6 Two ends of the first diode are respectively connected with a reverse diode in parallel;
one [0 °,360 °) electrical cycle includes a first sector within a [0 °,120 ° ] electrical angle interval, a second sector within a [120 °,240 ° ] electrical angle interval, and a third sector within a [240 °,360 ° ] electrical angle interval; the sector starting position of the first sector is 0 degrees, the sector starting position of the second sector is 120 degrees, and the sector starting position of the third sector is 240 degrees;
in the first sector, the self inductance of the A phase winding rises, the self inductance of the B phase winding is unchanged, the self inductance of the C phase winding falls, and an upper bridge arm switching tube connected with the phase winding with the self inductance rising in the first sector is a switching tube T 1 The lower bridge arm switch tube connected with the phase winding which self-inductance descends in the first sector is a switch tube T 6 ；
In the second sector, the self inductance of the B phase winding rises, the self inductance of the C phase winding is unchanged, the self inductance of the A phase winding falls, and an upper bridge arm switching tube connected with the phase winding with the self inductance rising in the second sector is a switching tube T 3 The lower bridge arm switch tube connected with the phase winding which self-inductance descends in the second sector is a switch tube T 2 ；
In the third sector, the self inductance of the C phase winding rises, the self inductance of the A phase winding is unchanged, the self inductance of the B phase winding falls, and an upper bridge arm switching tube connected with the phase winding with the self inductance rising in the third sector is a switching tube T 5 The lower bridge arm switch tube connected with the phase winding which self-inductance descends in the third sector is a switch tube T 4 。
The technical proposal is that,
in [0 DEG, beta ] electric angle interval, the switch tube T is controlled 1 And a switching tube T 6 All conducting, phase A winding and phase C winding and DC side filter capacitor C dc Are connected;
in [ beta, 120-gamma ] electric angle range, the switch tube T is controlled 1 Closing, only switching on the switching tube T 6 The A phase winding and the C phase winding pass through a switch tube T 6 And a switch tube T 2 Two ends of the diode D are reversely connected 2 Are connected;
the switch tube T is controlled in the electric angle range of 120-gamma, 120-alpha 3 And a switching tube T 6 All conducting, B phase winding and C phase winding and DC side filter capacitor C dc Are connected;
control the switching tube T in the electric angle range of 120-alpha, 120 DEG 6 Closing, only turning on the switching tube T 3 B phase winding and C phase winding pass through a switch tube T 3 And a switching tube T 5 Two ends of the diode D are reversely connected 5 Are connected;
the switching tube T is controlled in the electric angle range of 120 DEG, 120 DEG+beta 2 And a switching tube T 3 Conduction, A phase winding and B phase winding and direct current side filter capacitor C dc Are connected;
the switch tube T is controlled in the electric angle range of [120 DEG+beta, 240 DEG-gamma ] 3 Closing, only turning on the switching tube T 2 The phase A winding and the phase B winding pass through a switching tube T 2 And a switching tube T 4 Two ends of the diode D are reversely connected 4 Are connected;
the switch tube T is controlled in the electric angle range of [ 240-gamma, 240-alpha ] 2 And a switching tube T 5 Conduction, A phase winding and C phase winding and direct current side filter capacitor C dc Are connected;
control the switching tube T in the electric angle range of [240 DEG-alpha, 240 DEG ] 2 Closing, only turning on the switching tube T 5 The A phase winding and the C phase winding pass through a switch tube T 5 And a switching tube T 1 Two ends of the diode D are reversely connected 1 Are connected;
the switch tube T is controlled in the electric angle range of [240 DEG, 240 DEG+beta ] 4 And a switching tube T 5 Conduction, B-phase winding and C-phase winding and direct current side filter capacitor C dc Are connected;
the switch tube T is controlled in the electric angle interval of [240 DEG+beta, 360 DEG-gamma ] 5 Closing, only turning on the switching tube T 4 B phase winding and C phase winding pass through a switch tube T 4 And a switching tube T 6 Two ends of the diode D are reversely connected 6 Are connected;
the switch tube T is controlled in the electric angle interval of [360 DEG-gamma, 360 DEG-alpha ] 1 And a switching tube T 4 Conduction, A phase winding and B phase winding and direct current side filter capacitor C dc Are connected;
control the switching tube T in the electric angle range of 360-alpha, 360 DEG 4 Closing, only turning on the switching tube T 1 The phase A winding and the phase B winding pass through a switching tube T 1 And a switching tube T 3 Two ends of the diode D are reversely connected 3 Are connected.
The beneficial technical effects of this application are:
the method fully considers the problem that the current is longer from negative to positive due to overlarge conduction angle of an upper bridge arm and the problem that the forward current amplitude is smaller due to overlarge conduction angle of a lower bridge arm, controls the upper bridge arm switching tube connected with a self-inductance rising phase winding to be turned off at a beta electric angle after being conducted to a sector starting position in each sector, controls the lower bridge arm switching tube connected with the self-inductance falling phase winding to be turned off at an alpha angle after being conducted to the sector starting position, fully increases the conduction interval of the lower bridge arm switching tube flowing through forward current due to alpha > beta, increases the forward current value and further improves the power generation capacity of a motor.
The method is suitable for different motor operation conditions, gives out the conduction angle combination with the maximum output power according to the change of the rotor rotating speed and the resistance value of the load, and the conduction angle lookup table does not need to carry out complex calculation, so that the method has lower requirement on the operation capability of a processor and quick response.
The method utilizes the inherent controller, power converter and sensor of the three-phase electro-magnetic doubly salient generator controllable rectification power generation system, does not need to add new devices, is convenient and effective, and saves cost.
Drawings
Fig. 1 is a system topology diagram of an electro-magnetic doubly salient power generation system in one embodiment of the present application.
Fig. 2 is a control block diagram of an electro-magnetic doubly salient power generation system in one embodiment of the present application.
Fig. 3 is a diagram of the starved-to-on mode of a switching tube in a controllable rectifier for one electrical cycle in one embodiment of the present application.
Fig. 4 is a schematic flow chart of constructing a conduction angle table in one embodiment of the present application.
Detailed Description
The following describes the embodiments of the present application further with reference to the accompanying drawings.
The application discloses an asymmetric current control method of an electro-magnetic doubly salient power generation system, please refer to FIG. 1, in the electro-magnetic doubly salient power generation system of the applicationExcitation voltage source U f Excitation winding L of electrically excited doubly salient generator (DSEG) connected through asymmetric half bridge f Excitation voltage source U f The two ends of (a) are also connected in parallel with an excitation side filter capacitor C f . One end of a three-phase winding of the electro-magnetic doubly-salient generator is connected in star shape as a neutral point N, the other end of the three-phase winding is connected with a load R through a controllable rectifier to realize direct current output, and two ends of the load R are also connected with a direct current side filter capacitor C in parallel dc The voltage at the two ends of the load R is the DC bus voltage U dc . The control module is connected with the asymmetric half bridge and the switching tube in the controllable rectifier, controls the on-off of the switching tube in the asymmetric half bridge through a control signal ctrl1, and controls the on-off of the switching tube in the controllable rectifier through a control signal ctrl 2.
In one embodiment, as shown in FIG. 1, the controllable rectifier employs a three-phase bridge rectifier, a switching tube T 1 Collector, switching tube T of (2) 3 Collector and switching tube T of (2) 5 The collector electrodes of the load R are connected with one end of the load R, and the end is the direct current bus voltage U at the two ends of the load R dc Is connected to the positive voltage terminal of the capacitor. Switch tube T 1 Emitter-connected switching tube T 2 Collector of (C), switch tube T 3 Emitter-connected switching tube T 4 Collector of (C), switch tube T 5 Emitter-connected switching tube T 6 Collector of (C), switch tube T 2 Emitter, switch tube T of (2) 4 Emitter and switching tube T of (2) 6 The emitters of the load R are connected with the other end of the load, and the end is the direct current bus voltage U at the two ends of the load R dc Is connected to the negative voltage terminal of the capacitor. Switch tube T 1 Switch tube T 2 Switch tube T 3 Switch tube T 4 Switch tube T 5 And a switching tube T 6 The two ends of the two-way voltage transformer are respectively connected with the reverse diode in parallel. Switch tube T 1 The emitter of the (B) is connected with an A-phase winding of the electro-magnetic doubly salient generator, and a switching tube T 3 B-phase winding of electro-excited doubly salient generator is connected with an emitter of the electro-excited doubly salient generator, and a switching tube T 5 The emitter of which is connected with the C-phase winding of the electro-magnetic doubly salient generator.
In an asymmetric half-bridge, switching tube T 7 Is connected with an excitation voltage source U f Positive electrode of (C), switch tube T 7 Emitter-connected diode D 7 Cathode of diode D 7 Is connected with an excitation voltage source U f Is a negative electrode of (a). Diode D 8 Is connected with an excitation voltage source U f Positive electrode of diode D 8 Anode connection switch tube T of (2) 8 Collector of (C), switch tube T 8 The emitter of (2) is connected with an excitation voltage source U f Is a negative electrode of (a). Switch tube T 7 And a switching tube T 8 The two ends of the two-way voltage transformer are respectively connected with the reverse diode in parallel. Switch tube T 7 Through exciting resistor R f Connecting excitation windings L f Is a field winding L f The other end of (2) is connected with a switch tube T 8 Is provided.
The asymmetric current control method executed by the control module comprises the following steps:
controlling the duty cycle of the switching tubes in the asymmetric half bridge to excite the winding L f Exciting current i f Closed loop control is performed. In one embodiment, please refer to the control block diagram shown in fig. 2, a switching tube T is obtained 7 Is connected to the exciting resistor R f Exciting current i on the line of (2) f At a given current i fref And excitation current i f Takes the difference value of the (C) as the input of the PI controller, carries out amplitude limiting processing on the output of the PI controller to determine a target duty ratio d, determines a control signal ctrl1 according to the target duty ratio d and provides the control signal ctrl1 for a switching tube T 7 And a switching tube T 8 To control the switching tube T according to the target duty ratio d 7 And a switching tube T 8 On-off of (a) so that the exciting current i f Closed loop tracking of a given current i fref 。
Acquiring real-time rotor electrical angle θ by rotor position sensor mounted on electrically excited doubly salient generator e And according to the rotor electric angle theta e The switching of the switching tubes in the controllable rectifier is controlled such that for each sector of an electrical cycle there is the following control effect:
and before the sector starting position of the sector starts, the upper bridge arm switching tube connected with the phase winding rising in the self inductance in the sector in the controllable rectifier is controlled to be conducted in advance by the gamma electric angle, and the upper bridge arm switching tube is turned off at the beta electric angle after being continuously conducted to the sector starting position of the sector. And controlling a lower bridge arm switching tube connected with a phase winding which is self-induced to descend in the sector to be conducted in the controllable rectifier at the sector starting position of the sector, and continuously conducting the lower bridge arm switching tube to be turned off at an alpha electrical angle after the lower bridge arm switching tube is continuously conducted to the sector starting position of the sector. And controlling the rest switching tubes in the controllable rectifier to be continuously turned off, wherein alpha, beta and gamma are all conduction angle parameters, and alpha is larger than beta. The sector start position of each sector is the electrical angle from the previous sector to the sector. Wherein the conduction angle parameter α takes a value in an electrical angle interval of (0 °,120 ° ], the conduction angle parameter β takes a value in an electrical angle interval of [0 °, α), and in one embodiment α is much larger than β, i.e. the difference between α and β reaches a difference threshold. Typically, the value of β does not exceed 24 °, and the value of α is not less than 60 °, and in practical tests, the value of α is typically greater than 96 °.
In one embodiment, based on the configuration shown in FIG. 1, one [0 °,360 °) electrical cycle includes a first sector within the [0 °,120 ° ] electrical angle interval, a second sector within the [120 °,240 ° ] electrical angle interval, and a third sector within the [240 °,360 ° ] electrical angle interval. The sector start position of the first sector is 0 °, the sector start position of the second sector is 120 °, and the sector start position of the third sector is 240 °.
(1) In the first sector, self inductance L of A phase winding a Rising, self-inductance L of B phase winding b Invariable, self-inductance L of C phase winding c Descending. The sector start position of the first sector is at an electrical angle of 0 °. In the control process, the upper bridge arm switching tube connected with the phase winding rising in the first sector is a switching tube T 1 The lower bridge arm switch tube connected with the phase winding which self-inductance descends in the first sector is a switch tube T 6 。
(2) In the second sector, self inductance L of B phase winding b Rising, self-inductance L of C-phase winding c Invariable, self-inductance L of A phase winding a Descending. The sector start position of the second sector is at 120 electrical angle. In the control process, the upper bridge arm switch tube connected with the phase winding rising in the second sector is a switch tube T 3 And under self-inductance in the second sectorThe lower bridge arm switching tube connected with the descending phase winding is a switching tube T 2 。
(3) In the third sector, self inductance L of the C-phase winding c Rising, self-inductance L of A phase winding a Unchanged, self-inductance L of B phase winding b Descending. The sector start position of the third sector is at an electrical angle of 240 °. In the control process, the upper bridge arm switch tube connected with the phase winding rising in the third sector is a switch tube T 5 The lower bridge arm switch tube connected with the phase winding which self-inductance descends in the third sector is a switch tube T 4 。
Referring to the conduction mode diagram shown in fig. 3, in one [0 °,360 ° ] electrical cycle, the state of the electro-magnetic doubly salient power generation system in different electrical angle intervals is:
in the mode I of [0 DEG, beta ] electric angle section, the switching tube T is controlled 1 And a switching tube T 6 All conducting, phase A winding and phase C winding and DC side filter capacitor C dc Are connected.
In the mode II of [ beta, 120-gamma ] electric angle interval, the switching tube T is controlled 1 Closing, only switching on the switching tube T 6 The A phase winding and the C phase winding pass through a switch tube T 6 And a switch tube T 2 Two ends of the diode D are reversely connected 2 Are connected.
In the mode III of [ 120-gamma, 120-alpha ] electric angle interval, the switching tube T is controlled 3 And a switching tube T 6 All conducting, B phase winding and C phase winding and DC side filter capacitor C dc Are connected.
In the mode IV of the [120 DEG-alpha, 120 DEG ] electric angle section, the switching tube T is controlled 6 Closing, only turning on the switching tube T 3 B phase winding and C phase winding pass through a switch tube T 3 And a switching tube T 5 Two ends of the diode D are reversely connected 5 Are connected.
In the mode V of [120 DEG, 120 DEG+beta ] electric angle section, the switching tube T is controlled 2 And a switching tube T 3 Conduction, A phase winding and B phase winding and direct current side filter capacitor C dc Are connected.
In the mode VI of [120 DEG+beta, 240 DEG-gamma ] electric angle interval, the switching tube T is controlled 3 Closing, only turning on the switching tube T 2 The phase A winding and the phase B winding pass through a switching tube T 2 And a switching tube T 4 Two ends of the diode D are reversely connected 4 Are connected.
In the mode VII of [ 240-gamma, 240-alpha ] electric angle interval, the switching tube T is controlled 2 And a switching tube T 5 Conduction, A phase winding and C phase winding and direct current side filter capacitor C dc Are connected.
In the mode VIII of [240 DEG-alpha, 240 DEG ] electric angle section, the switching tube T is controlled 2 Closing, only turning on the switching tube T 5 The A phase winding and the C phase winding pass through a switch tube T 5 And a switching tube T 1 Two ends of the diode D are reversely connected 1 Are connected.
In the mode IX of the [240 DEG, 240 DEG+beta ] electrical angle interval, the switching tube T is controlled 4 And a switching tube T 5 Conduction, B-phase winding and C-phase winding and direct current side filter capacitor C dc Are connected.
The switching tube T is controlled in the mode X of [240 DEG+beta, 360 DEG-gamma ] electric angle interval 5 Closing, only turning on the switching tube T 4 B phase winding and C phase winding pass through a switch tube T 4 And a switching tube T 6 Two ends of the diode D are reversely connected 6 Are connected.
In the mode XI of [ 360-gamma, 360-alpha ] electric angle interval, the switching tube T is controlled 1 And a switching tube T 4 Conduction, A phase winding and B phase winding and direct current side filter capacitor C dc Are connected.
In mode XII of [360 ° -alpha, 360 ° ] electrical angle section, the switching tube T is controlled 4 Closing, only turning on the switching tube T 1 The phase A winding and the phase B winding pass through a switching tube T 1 And a switching tube T 3 Two ends of the diode D are reversely connected 3 Are connected.
In the asymmetric current control method, values of conduction angle parameters alpha, beta and gamma can be set in a self-defined mode, so that the electro-magnetic doubly-salient power generation system has higher output power. However, considering that when the electro-magnetic doubly salient power generation system works under different operation conditions, the values of the conduction angle parameters alpha, beta and gamma are different, in one embodiment, the current operation condition information of the electro-magnetic doubly salient power generation system is determined, and the conduction angle combination corresponding to the operation condition information in the conduction angle table is determined, wherein the conduction angle combination comprises the values of alpha, beta and gamma. The conduction angle meter comprises corresponding relations between different working condition information and conduction angle combinations, and the conduction angle combination corresponding to each working condition information is a conduction angle combination which enables the output power of the electro-magnetic doubly-salient power generation system to be maximum when the electro-magnetic doubly-salient power generation system operates under the operation working condition corresponding to the working condition information. And then, a control signal Ctrl2 is generated according to the value in the conduction angle combination and is output to a switching tube in the controllable rectifier, so that the switching tube in the controllable rectifier can be controlled to be switched on and off according to the above process by the conduction angle combination, and the electro-magnetic doubly salient power generation system has the maximum output power under the current operation working condition.
In this embodiment, the load R is a resistive variable load, and the operating condition information of the electro-magnetic doubly salient power generation system includes a resistance value of the load R and a rotor speed n of the electro-magnetic doubly salient power generator. The method for determining the working condition information of the electro-magnetic doubly salient power generation system comprises the following steps: collecting direct current bus voltage U at two ends of load dc Load current i on load dc According to r=u dc /i dc And calculating to obtain the resistance value R of the load R. And according to rotor electrical angle θ e And calculating the change rate relative to time to obtain the rotor rotating speed n of the electro-magnetic doubly salient generator.
The conduction angle table is pre-established, and in one embodiment, the method for establishing the conduction angle table includes the following steps, please refer to fig. 4:
and controlling the electro-magnetic doubly salient power generation system to operate under the operation working condition corresponding to the set of working condition information, changing the conduction angle combination under the current operation working condition, and determining the output power of the electro-magnetic doubly salient power generation system under each conduction angle combination. And then recording the corresponding relation between the conduction angle combination with the maximum output power of the electro-magnetic doubly salient power generation system and the current working condition information.
When the conduction angle combination is changed, the conduction angle parameter beta takes a value in an electric angle interval of [0 degrees, alpha ], and the conduction angle parameter alpha takes a value in an electric angle interval of (0 degrees, 120 degrees). To accommodate most operating conditions and reduce data collection, one embodiment provides a method of varying a conduction angle combination comprising:
firstly, selecting the value of a conduction angle parameter gamma, wherein the value of the conduction angle parameter gamma is a natural reversing point from zero to negative of the induced potential of a phase winding, and the value is adopted under all operation conditions, for example, according to actual measurement, the value of gamma is generally in a [12 DEG, 36 DEG ] electrical angle interval.
And then sequentially traversing the plurality of different values of the conduction angle parameter beta according to a second step in the electric angle interval of [0 degrees and alpha ] on the basis that the value of the conduction angle parameter gamma and the value of each conduction angle parameter alpha are unchanged.
The first step and the second step are custom parameters, and may be equal or unequal, for example, in one example, for convenience of equal division, the value of the conduction angle parameter α is selected according to 12 ° in the second step in the electrical angle interval of (0 °,120 ° ], and the value of the conduction angle parameter β is selected according to 12 ° in the first step in the electrical angle interval of [0 °, α). Therefore, the value of the conduction angle parameter alpha can be selected according to the second step of 12 degrees in the electric angle interval of [12 degrees, 120 degrees ], and the value of the conduction angle parameter beta can be selected according to the first step of 12 degrees in the electric angle interval of [0 degrees, alpha-12 degrees ].
Then, under the condition of γ=24°, α=12°, the unique value of the conduction angle parameter β is taken as 0 °, and a group of conduction angle combinations is obtained. Then changing the value of the conduction angle parameter alpha to be alpha=24°, and traversing two values of the conduction angle parameter beta in the electrical angle interval of [0 °,12 ° ] under the conditions of gamma=24°, and obtaining two groups of different conduction angle combinations. The above procedure is repeated until all 10 values of the conduction angle parameter beta are traversed in the electrical angle interval of [0 °,108 ° ] under the conditions of γ=24°, α=120°, resulting in 10 sets of different conduction angle combinations. A total of 55 different combinations of conduction angles are thus obtained.
And then changing the working condition information and executing the step of controlling the electro-magnetic doubly-salient power generation system to operate under the operation working condition corresponding to one set of working condition information again, namely repeating the process until the corresponding relation between each set of working condition information and the corresponding conduction angle combination is constructed, and establishing and obtaining a conduction angle table.
What has been described above is only a preferred embodiment of the present application, which is not limited to the above examples. It is to be understood that other modifications and variations which may be directly derived or contemplated by those skilled in the art without departing from the spirit and concepts of the present application are to be considered as being included within the scope of the present application.
Claims (10)
1. An asymmetric current control method of a power generation system is characterized in that in an electro-magnetic doubly salient power generation system, a magnetic excitation voltage source U f Excitation winding L of electric excitation doubly salient generator connected through asymmetric half bridge f One end of a three-phase winding of the electro-magnetic doubly salient generator is connected in a star shape, the other end of the three-phase winding is connected with a load through a controllable rectifier, and two ends of the load are also connected with a direct-current side filter capacitor C in parallel dc The method comprises the steps of carrying out a first treatment on the surface of the The control module is connected with and controls the switching tube in the asymmetric half bridge and the switching tube in the controllable rectifier, and the asymmetric current control method executed by the control module comprises the following steps:
controlling the duty ratio of the switching tube in the asymmetric half bridge to carry out closed-loop control on the exciting current on the exciting winding and according to the rotor electric angle theta e Controlling the switching of the switching tubes in the controllable rectifier such that for each sector of an electrical cycle:
an upper bridge arm switching tube connected with a phase winding which rises in a self-inductance way in the sector is controlled to be conducted by an gamma electric angle in advance before the beginning of the sector starting position of the sector, and is turned off at a beta electric angle after the upper bridge arm switching tube is continuously conducted to the sector starting position of the sector; a lower bridge arm switching tube connected with a phase winding which is self-induced to descend in the sector in the controllable rectifier is controlled to be conducted at the sector starting position of the sector, and the lower bridge arm switching tube is turned off at an alpha electrical angle after being continuously conducted to the sector starting position of the sector; and controlling the rest switching tubes in the controllable rectifier to be continuously kept off, wherein alpha, beta and gamma are all conduction angle parameters, and alpha is larger than beta.
2. The method according to claim 1, wherein the method of determining the conduction angle parameters α, β, γ comprises:
determining working condition information of the electro-magnetic doubly salient power generation system, and determining a conduction angle combination corresponding to the working condition information in a conduction angle table, wherein the conduction angle combination comprises values of alpha, beta and gamma;
the conduction angle meter comprises corresponding relations between different working condition information and conduction angle combinations, and the conduction angle combination corresponding to each working condition information is a conduction angle combination with the largest output power of the electro-magnetic doubly-salient power generation system when the electro-magnetic doubly-salient power generation system operates under the operation working condition corresponding to the working condition information.
3. The method of claim 2, wherein the load is a resistive variable load and the operating condition information of the electro-magnetic doubly salient power generation system includes a resistance value of the load R and a rotor speed n of the electro-magnetic doubly salient power generator.
4. A method according to claim 3, wherein the method of determining operating condition information of the electro-magnetic doubly salient power generation system comprises:
collecting the direct current bus voltage U at two ends of the load dc Load current i on the load dc According to r=u dc /i dc Calculating the resistance R of the load, and according to the rotor electric angle theta e And calculating the change rate relative to time to obtain the rotor rotating speed n of the electro-magnetic doubly salient generator.
5. The method of claim 2, wherein the method of establishing the conduction angle table comprises:
controlling the electro-magnetic doubly salient power generation system to operate under an operation condition corresponding to a set of condition information, changing conduction angle combinations, determining output power of the electro-magnetic doubly salient power generation system under each conduction angle combination, and recording a corresponding relation between the conduction angle combination with the largest output power of the electro-magnetic doubly salient power generation system and the current condition information;
changing working condition information and executing the step of controlling the operation of the electro-magnetic doubly-salient power generation system under the operation working condition corresponding to one set of working condition information again until the corresponding relation between each set of working condition information and the corresponding conduction angle combination is constructed, and establishing and obtaining the conduction angle table.
6. The method according to claim 1, characterized in that the conduction angle parameter α takes on values in the electrical angle interval of (0 °,120 ° ], the conduction angle parameter β takes on values in the electrical angle interval of [0 °, α), and the difference between α and β reaches a difference threshold.
7. The method of claim 6, wherein the method of changing the conduction angle combination comprises:
selecting the value of a conduction angle parameter gamma;
sequentially traversing a plurality of different values of the selected conduction angle parameter alpha according to a first step in an electrical angle interval of (0 degree, 120 degree);
on the basis of unchanged values of the conduction angle parameter gamma and the conduction angle parameter alpha, sequentially traversing and selecting a plurality of different values of the conduction angle parameter beta according to a second step in an electric angle interval of [0 degrees alpha).
8. The method according to claim 1, wherein in the asymmetric half bridge, a switching tube T 7 Is connected with the exciting voltage source U f Positive electrode of (C), switch tube T 7 Emitter-connected diode D 7 Cathode of diode D 7 Is connected with the exciting voltage source U f Is a negative electrode of (a); diode D 8 Is connected with the exciting voltage source U f Positive electrode of (a)Diode D 8 Anode connection switch tube T of (2) 8 Collector of (C), switch tube T 8 The emitter of (2) is connected with the exciting voltage source U f Is a negative electrode of (a); switch tube T 7 And a switching tube T 8 Two ends of the first diode are respectively connected with a reverse diode in parallel; switch tube T 7 Through exciting resistor R f Is connected with the exciting winding L f Is provided with one end of the exciting winding L f The other end of (2) is connected with a switch tube T 8 A collector electrode of (a);
the method for controlling the duty ratio of the switching tube in the asymmetric half bridge to carry out closed-loop control on the exciting current on the exciting winding comprises the following steps:
acquisition switch tube T 7 Is connected to the exciting resistor R f Exciting current i on the line of (2) f At a given current i fref And excitation current i f Takes the difference value of the output voltage as the input of a PI controller, and controls a switching tube T according to the duty ratio corresponding to the output of the PI controller 7 And a switching tube T 8 Is provided.
9. The method according to claim 1, wherein the controllable rectifier is a three-phase bridge rectifier, a switching tube T 1 Collector, switching tube T of (2) 3 Collector and switching tube T of (2) 5 The collector electrodes of the switch tube T are connected with one end of the load 1 Emitter-connected switching tube T 2 Collector of (C), switch tube T 3 Emitter-connected switching tube T 4 Collector of (C), switch tube T 5 Emitter-connected switching tube T 6 Collector of (C), switch tube T 2 Emitter, switch tube T of (2) 4 Emitter and switching tube T of (2) 6 The emitters of the two are connected with each other and the other end of the load;
switch tube T 1 The emitter of the switch tube T is connected with the A-phase winding of the electro-magnetic doubly salient generator 3 The emitter of the switch tube T is connected with the B-phase winding of the electro-magnetic doubly salient generator 5 The emitter of the double-salient generator is connected with the C-phase winding of the double-salient generator; switch tube T 1 Switch tube T 2 Switch tube T 3 Switch tube T 4 Switch tube T 5 And a switching tube T 6 Two ends of the first diode are respectively connected with a reverse diode in parallel;
one [0 °,360 °) electrical cycle comprises a first sector within an [0 °,120 ° ] electrical angle interval, a second sector within an [120 °,240 ° ] electrical angle interval, and a third sector within an [240 °,360 ° ] electrical angle interval, the first sector having a sector start position of 0 °, the second sector having a sector start position of 120 °, the third sector having a sector start position of 240 °;
in the first sector, the self inductance of the A phase winding rises, the self inductance of the B phase winding is unchanged, the self inductance of the C phase winding falls, and an upper bridge arm switching tube connected with the phase winding with the self inductance rising in the first sector is a switching tube T 1 The lower bridge arm switch tube connected with the phase winding which self-inductance descends in the first sector is a switch tube T 6 ；
In the second sector, the self inductance of the B phase winding rises, the self inductance of the C phase winding is unchanged, the self inductance of the A phase winding falls, and an upper bridge arm switching tube connected with the phase winding with the self inductance rising in the second sector is a switching tube T 3 The lower bridge arm switch tube connected with the phase winding which self-inductance descends in the second sector is a switch tube T 2 ；
In the third sector, the self inductance of the C phase winding rises, the self inductance of the A phase winding is unchanged, the self inductance of the B phase winding falls, and an upper bridge arm switching tube connected with the phase winding with the self inductance rising in the third sector is a switching tube T 5 The lower bridge arm switch tube connected with the phase winding which self-inductance descends in the third sector is a switch tube T 4 。
10. The method of claim 9, wherein the step of determining the position of the substrate comprises,
in [0 DEG, beta ] electric angle interval, the switch tube T is controlled 1 And a switching tube T 6 All conducting, phase A winding and phase C winding and DC side filter capacitor C dc Are connected;
in [ beta, 120-gamma ] electric angle range, the switch tube T is controlled 1 Closing, only switching on the switching tube T 6 Phase A windingC phase winding passes through a switching tube T 6 And a switch tube T 2 Two ends of the diode D are reversely connected 2 Are connected;
the switch tube T is controlled in the electric angle range of 120-gamma, 120-alpha 3 And a switching tube T 6 All conducting, B phase winding and C phase winding and DC side filter capacitor C dc Are connected;
control the switching tube T in the electric angle range of 120-alpha, 120 DEG 6 Closing, only turning on the switching tube T 3 B phase winding and C phase winding pass through a switch tube T 3 And a switching tube T 5 Two ends of the diode D are reversely connected 5 Are connected;
the switching tube T is controlled in the electric angle range of 120 DEG, 120 DEG+beta 2 And a switching tube T 3 Conduction, A phase winding and B phase winding and direct current side filter capacitor C dc Are connected;
the switch tube T is controlled in the electric angle range of [120 DEG+beta, 240 DEG-gamma ] 3 Closing, only turning on the switching tube T 2 The phase A winding and the phase B winding pass through a switching tube T 2 And a switching tube T 4 Two ends of the diode D are reversely connected 4 Are connected;
the switch tube T is controlled in the electric angle range of [ 240-gamma, 240-alpha ] 2 And a switching tube T 5 Conduction, A phase winding and C phase winding and direct current side filter capacitor C dc Are connected;
control the switching tube T in the electric angle range of [240 DEG-alpha, 240 DEG ] 2 Closing, only turning on the switching tube T 5 The A phase winding and the C phase winding pass through a switch tube T 5 And a switching tube T 1 Two ends of the diode D are reversely connected 1 Are connected;
the switch tube T is controlled in the electric angle range of [240 DEG, 240 DEG+beta ] 4 And a switching tube T 5 Conduction, B-phase winding and C-phase winding and direct current side filter capacitor C dc Are connected;
the switch tube T is controlled in the electric angle interval of [240 DEG+beta, 360 DEG-gamma ] 5 Closing, only turning on the switching tube T 4 B phase winding and C phase winding pass through a switch tube T 4 And a switching tube T 6 Two ends of the diode D are reversely connected 6 Are connected;
the switch tube T is controlled in the electric angle interval of [360 DEG-gamma, 360 DEG-alpha ] 1 And a switching tube T 4 Conduction, A phase winding and B phase winding and direct current side filter capacitor C dc Are connected;
control the switching tube T in the electric angle range of 360-alpha, 360 DEG 4 Closing, only turning on the switching tube T 1 The phase A winding and the phase B winding pass through a switching tube T 1 And a switching tube T 3 Two ends of the diode D are reversely connected 3 Are connected.
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