CN112468042B - Power take-off vehicle-mounted power supply system realized by direct-current voltage sampling circuit - Google Patents
Power take-off vehicle-mounted power supply system realized by direct-current voltage sampling circuit Download PDFInfo
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- CN112468042B CN112468042B CN202011157217.5A CN202011157217A CN112468042B CN 112468042 B CN112468042 B CN 112468042B CN 202011157217 A CN202011157217 A CN 202011157217A CN 112468042 B CN112468042 B CN 112468042B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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Abstract
The invention discloses a power take-off vehicle-mounted power supply system realized by a direct-current voltage sampling circuit, which comprises: the device comprises a rectifier diode, a direct current capacitor, an inverter circuit, a controller, an excitation power supply and a small-capacity direct current sampling circuit; the rectifier diode receives alternating current generated by the generator, rectifies the alternating current into direct current with pulsation, and outputs the direct current to the direct current capacitor; the direct current capacitor carries out filtering processing on the received direct current with pulsation to obtain straight direct current, and the straight direct current is output to the inverter circuit; an inverter circuit: under the control of the controller, the straight direct current is inverted into stable alternating current for an external load to use; the small-capacity direct current sampling circuit collects the voltage of alternating current generated by the generator in real time and converts the voltage into sampling direct current. The invention improves the light load stability and the feedback rapidity.
Description
Technical Field
The invention belongs to the technical field of vehicle-mounted power supply, and particularly relates to a power take-off vehicle-mounted power supply system realized by a direct-current voltage sampling circuit.
Background
An onboard power supply is a typical military and civilian combination product. On missile launching vehicles and large engineering machinery vehicles, even civil trucks, a 380V high-power three-phase power supply is needed for a 380V high-power three-phase load. The addition of a diesel generator to a vehicle results in increased cost and maintenance complexity, and is an outdated solution. The reasonable mode is that the generator is directly connected to the automobile engine, but a new problem is caused, the rotating speed of the engine is changed rapidly in the process of acceleration and deceleration, the range is wide, the difference is several times, the output voltage and the frequency of the generator are changed several times, and the generator is not acceptable for electrical appliances at all. The output must be provided with a voltage and frequency stabilizing device. The traditional method is that a hydraulic transmission and a hydraulic motor are used for driving a generator, a hydraulic pump is coaxially arranged on the engine and is transmitted to the hydraulic motor behind through a hydraulic oil circuit, and the hydraulic motor drives the generator to generate electricity. The hydraulic motor is provided with a controller, and closed-loop control is performed according to the output voltage, so that the output rotating speed of the hydraulic motor is basically stable, and the stable output voltage is achieved. The technology has the problems of large volume and weight, insufficient flexibility of the pipeline and complex installation.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects in the prior art are overcome, the power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit is provided, and the light-load stability and the feedback rapidity are improved.
The purpose of the invention is realized by the following technical scheme: a power take-off vehicle-mounted power supply system realized by a direct-current voltage sampling circuit comprises: the device comprises a rectifier diode, a direct current capacitor, an inverter circuit, a controller, an excitation power supply and a small-capacity direct current sampling circuit; the rectifier diode receives alternating current generated by the generator, rectifies the alternating current into direct current with pulsation, and outputs the direct current to the direct current capacitor; a direct current capacitor: filtering the received direct current with pulsation to obtain straight direct current, and outputting the straight direct current to an inverter circuit; an inverter circuit: under the control of the controller, the straight direct current is inverted into stable alternating current for an external load to use; the small-capacity direct current sampling circuit collects the voltage of alternating current generated by the generator in real time and converts the voltage into sampling direct current; the controller collects the voltage of the sampling direct current of the small-capacity direct current sampling circuit, the voltage of the straight direct current output to the inverter circuit by the direct current capacitor, the current of an external load and the exciting current output to the generator by the exciting power supply in real time, monitors the variation trends of the two voltages of the voltage of the sampling direct current and the voltage of the straight direct current, controls the exciting power supply to increase or decrease the exciting current according to the variation trends, and transmits the increased or decreased exciting current to the generator.
In the power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit, when the two voltages are reduced, the excitation power supply is controlled to increase the excitation current, and the increased excitation current is transmitted to the generator; when the two voltages are increased, the excitation power supply is controlled to reduce the excitation current, and the reduced excitation current is transmitted to the generator.
In the power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit, the small-capacity direct-current sampling circuit comprises a dissipation resistor R, a filter capacitor C, a three-phase rectifying circuit and a transformer T; the transformer T input is connected with the motor terminal voltage, the output is connected with the three-phase rectifying circuit, and the output of the three-phase rectifying circuit is connected with the filter capacitor C and then connected with the dissipation resistor R.
In the power take-off vehicle-mounted power supply system implemented by the direct-current voltage sampling circuit, the three-phase rectification circuit comprises a rectifier diode D1, a rectifier diode D2, a rectifier diode D3, a rectifier diode D4, a rectifier diode D5 and a rectifier diode D6; the rectifier diode D1 and the rectifier diode D2 are connected in series to form a first rectifying branch, the rectifier diode D3 and the rectifier diode D4 are connected in series to form a second rectifying branch, and the rectifier diode D5 and the rectifier diode D6 are connected in series to form a third rectifying branch; the first rectifying branch, the second rectifying branch and the third rectifying branch are connected in parallel.
In the power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit, the filter capacitor C is as follows: c > -13.24/{ f × (U/I) × ACv }; where C is the filter capacitance, F is the pulse frequency of the rectifier circuit, U is the maximum output voltage of the rectifier circuit, I is the maximum output current of the rectifier circuit, and Acv is the ripple factor.
In the power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit, the dissipation resistor R is used for consuming the energy of the filter capacitor, and the power of the dissipation resistor R is not too large and not more than 40W under consideration.
In the power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit, the controller obtains an exciting current output instruction in a double-closed-loop control mode, the double closed loop comprises an inner loop and an outer loop, wherein the inner loop is an exciting current loop, the outer loop is a direct-current voltage loop, and the controller, the exciting power supply, the generator and the small-capacity direct-current sampling circuit form a double closed loop.
In the power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit, the control method of the controller is as follows:
(1) the controller collects direct current voltage and exciting current output by an exciting power supply to the generator in real time, performs PID control on the outer ring according to the direct current voltage, and outputs an exciting current adjusting instruction to the inner ring;
(2) the controller carries out PI control on the inner ring according to the exciting current adjusting instruction and the real-time exciting current output to the generator by the exciting power supply to obtain a duty ratio instruction of the exciting power supply, and the exciting power supply outputs corresponding exciting current to the generator according to the duty ratio instruction.
In the power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit, the relation between the voltage of the sampled direct current and the voltage of the straight direct current is as follows:
U dc(real) ＝k (s) ×U dc(s) +b (s) ；
wherein s is n <s<s n+1 ，n＝1、2、3、4、5，U dc(real) Voltage of a flat direct current, U dc(s) For sampling the DC voltage, s is the value in a segment, s n Is a starting value of a segment, s n+1 N is the number of voltage value segments.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention achieves the following effects through the dissipation resistance characteristic of the small-capacity direct current sampling circuit: at voltage drops, the rapidity is increased. When the main voltage falls, because sampling circuit's electric capacity is very little, the energy can be consumed very fast, and sampling voltage can be faster than the main circuit and has followed voltage drop, and the actual measurement can be 3 ~ 5 times fast.
(2) The invention achieves the following effects through the characteristics of the small-capacity direct current sampling circuit: and the more optimal control parameters are adjusted in a faster time, the stability is greatly improved, and the jitter is reduced by 40 percent compared with the prior art when the load is light.
(3) The invention achieves the following effects through the characteristics of the small-capacity direct current sampling circuit: the feedback rapidity of the direct current voltage is improved by 30%, the excitation control speed is also improved by 30%, so that the designed terminal voltage value of the generator can be reduced from 470V to 430V, the insulation pressure of the system is reduced, the volume of the generator is also reduced, and the weight of the generator is reduced by 15%.
(4) The invention achieves the following effects through the double closed-loop control characteristic of the small-capacity direct current sampling circuit: the vehicle-mounted power supply achieves a better control effect. The full load sudden loading and sudden loading tests all meet the national standard requirements of drop of less than 10% and less than 0.5S.
(5) The invention achieves the following effects by using the characteristic of a small transformer for voltage reduction of a small-capacity direct current sampling circuit: the sampling circuit is miniaturized, and direct-current voltage sampling can be realized only by using a capacitor and a diode of a signal level.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram of a power take-off vehicle-mounted power supply system implemented by a dc voltage sampling circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a low-capacity DC sampling circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of dual closed loop control of a vehicle-mounted power supply according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a block diagram of a power take-off vehicle-mounted power supply system implemented by a dc voltage sampling circuit according to an embodiment of the present invention. As shown in fig. 1, the power take-off vehicle-mounted power supply system implemented by the dc voltage sampling circuit includes: the device comprises a rectifier diode, a direct current capacitor, an inverter circuit, a controller, an excitation power supply and a small-capacity direct current sampling circuit; wherein the content of the first and second substances,
the rectifier diode receives alternating current generated by the generator, rectifies the alternating current into direct current with pulsation, and outputs the direct current to the direct current capacitor;
a direct current capacitor: filtering the received direct current with pulsation to obtain straight direct current, and outputting the straight direct current to an inverter circuit;
an inverter circuit: under the control of the controller, the straight direct current is inverted into stable alternating current for an external load to use;
the small-capacity direct current sampling circuit collects the voltage of alternating current generated by the generator in real time and converts the voltage into sampling direct current;
the controller collects the voltage of the sampling direct current of the small-capacity direct current sampling circuit, the voltage of the straight direct current output to the inverter circuit by the direct current capacitor, the current of an external load and the exciting current output to the generator by the exciting power supply in real time, monitors the variation trends of the two voltages of the voltage of the sampling direct current and the voltage of the straight direct current, controls the exciting power supply to increase or decrease the exciting current according to the variation trends, and transmits the increased or decreased exciting current to the generator.
When the two voltages are reduced, controlling the excitation power supply to increase the excitation current and transmitting the increased excitation current to the generator; when the two voltages are increased, the excitation power supply is controlled to reduce the excitation current, and the reduced excitation current is transmitted to the generator.
The power take-off vehicle-mounted power supply is connected to the terminal voltage of the generator, the generator is coaxially and directly connected with the automobile generator, the rotating speed of the automobile engine is changed along with the size of an accelerator, so that the rotating speed of the generator is also changed, the rotating speed is approximately changed from 500 to 3000, the output voltage and the frequency of the generator are greatly changed, the generator cannot be directly used, and the power take-off vehicle-mounted power supply is required to be changed by power. The controller of the power take-off vehicle-mounted power supply stabilizes the output voltage of the generator by adjusting the exciting current of the generator, and increases or decreases the exciting current according to the output voltage of the generator. It becomes very important to obtain the output voltage value of the generator quickly. If the sampling is carried out directly, because the sampling is caused by alternating voltage and the frequency is changed, the traditional periodic root mean square method cannot be used for calculation, only the strong filtering method can be used for calculation, and the reaction is slow. The invention designs a small rectification sampling circuit, rectifies alternating current into direct current, and the direct current completely reflects the change of alternating voltage and has fast response speed, and a controller can sample the direct current voltage. The controller is used for controlling the stable terminal voltage of the exciting current of the generator, rectifying the stable terminal voltage into direct current through the rectifier diode, and inverting the direct current into stable alternating voltage through the inverter current to output the stable alternating voltage to a load. The controller controls exciting current by using double closed-loop control, an outer ring is a direct current voltage ring, an inner ring is an exciting current ring, the controller controls and outputs the exciting current to an exciting circuit consisting of an 80V direct current power supply and an H-bridge circuit, and the output exciting current is connected to the excitation input of the generator.
As shown in fig. 2, the small-capacity dc sampling circuit includes a dissipation resistor R, a filter capacitor C, a three-phase rectification circuit, and a transformer T; the transformer T input is connected with the motor terminal voltage, the output is connected with the three-phase rectifying circuit, and the output of the three-phase rectifying circuit is connected with the filter capacitor C and then connected with the dissipation resistor R.
The three-phase rectifying circuit comprises a rectifying diode D1, a rectifying diode D2, a rectifying diode D3, a rectifying diode D4, a rectifying diode D5 and a rectifying diode D6; wherein the content of the first and second substances,
the rectifier diode D1 and the rectifier diode D2 are connected in series to form a first rectifying branch, the rectifier diode D3 and the rectifier diode D4 are connected in series to form a second rectifying branch, and the rectifier diode D5 and the rectifier diode D6 are connected in series to form a third rectifying branch; the first rectifying branch, the second rectifying branch and the third rectifying branch are connected in parallel.
The small-capacity direct current sampling circuit is a three-phase full-bridge rectifying circuit consisting of six small diodes and a small capacitor, is connected to the three-phase voltage of the generator, and outputs direct current voltage; the DC voltage is connected to the sampling circuit of the controller, the DC voltage is completely determined by the output voltage of the generator, and the sampling of the DC voltage by the controller is equivalent to the sampling of the AC voltage output by the generator. The small-capacity direct current sampling circuit is also used for sampling direct current voltage, has small fluctuation and good stability, and can completely replace the direct current voltage of a main circuit to be used as an outer ring.
The small-capacity excitation power supply is formed by connecting a three-phase transformer, a three-phase bridge rectifier circuit, a direct-current filter capacitor and a dissipation resistor in parallel. The input is the generator terminal voltage and the output is the direct current voltage. The three-phase bridge rectifier circuit is composed of 6 small diodes.
The filter capacitor C is: c > -13.24/{ f × (U/I) × ACv }; wherein, C: is the filter capacitance, in F. 13.24: is a constant derived from the ripple factor of the full-wave resistive load rectifying circuit. F: the pulse frequency of the rectifying circuit is 300Hz, and the unit is Hz. U: is the maximum output voltage of the rectifier circuit, with the unit being V. I: is the maximum output current of the rectifier circuit, and the unit is A. Acv: is the waviness factor, in%. Generally, the concentration is 3-8%.
The function of the dissipation resistor R is to consume the energy of the filter capacitor, and if no resistor exists, the electric quantity of the capacitor can be always kept, the voltage can be kept to be distorted, and theoretically, the larger the resistor is, the better the resistor is. Considering that the power of the dissipation resistor cannot be too large, generally cannot be larger than 40W, and the operating voltage is also known, the resistance can be calculated: and R is P/U.
The sampling position samples in front of the inductor, so that waveform distortion is prevented. When the terminal voltage rises, the dc voltage of the main circuit overshoots. The sampling circuit is connected to the front of the inductor, i.e. at the terminal voltage of the emitter voltage, to prevent this distortion.
The sampling only needs signals and does not need energy, and the voltage can be reduced by using a small transformer, so that the later sampling voltage can use a diode with smaller withstand voltage, a capacitor and a dissipation resistor.
As shown in fig. 3, the controller obtains the exciting current output instruction by using a double closed-loop control method, the double closed-loop includes an inner loop and an outer loop, the inner loop is an exciting current loop, the outer loop is a dc voltage loop, and the controller, the exciting power supply, the generator and the small-capacity dc sampling circuit form a double closed loop.
The control method of the controller is as follows:
(1) the controller collects direct current voltage and exciting current output by an exciting power supply to the generator in real time, performs PID control on the outer ring according to the direct current voltage, and outputs an exciting current adjusting instruction to the inner ring;
(2) the controller carries out PI control on the inner ring according to the exciting current adjusting instruction and the real-time exciting current output to the generator by the exciting power supply to obtain a duty ratio instruction of the exciting power supply, and the exciting power supply outputs corresponding exciting current to the generator according to the duty ratio instruction.
Because of the special sampling circuit, there is still some time measurement error in the direct voltage sampling with the main loop. And eliminating measurement errors by adopting methods of zero calibration, proportional calibration and piecewise linearization.
The relationship between the voltage of the sampled dc and the voltage of the flat dc is:
U dc(real) ＝k (s) ×U dc(s) +b (s) ；
wherein s is n <s<s n+1 ，n＝1、2、3、4、5，U dc(real) Voltage of a flat direct current, U dc(s) For sampling the DC voltage, s is the value in a segment, s n Is a starting value of a segment, s n+1 For a certain segment of the end-point value, n is the number of voltage value segments, e.g. [0V 100V ]]、[100V 200V]Each is a segment, when s 1 ＝0V，s 2 ＝100V，s 3 ＝200V。
The invention relates to a vehicle-mounted power supply directly connected with an automobile engine. Designed to replace previous hydraulic system solutions. The rotating speed of the automobile engine has a rotating speed range which is several times that of a direct-connected generator, the voltage and the frequency of the direct-connected generator can be changed several times, and the direct-connected generator can not be directly used. On the basis of exciting the inner loop, a small-capacity direct current sampling circuit is particularly used as outer loop control.
The invention adopts quick regulation excitation to stabilize voltage and adopts AC-DC-AC inversion to stabilize frequency. Adjusting the excitation requires a double closed loop to control the excitation current. The inner ring is an exciting current ring, and the outer ring is a direct current voltage ring. The ac voltage detection effective value is slow and is not suitable for use as a fast excitation system. The direct current voltage is introduced as a feedback value of an outer loop, and the direct current voltage is stabilized. Because the front stage of the invention is pure diode rectification, the direct current voltage and the alternating current voltage are in a complete corresponding relation, and the aim of stabilizing the direct current voltage is to completely achieve the aim of stabilizing the alternating current voltage. The small-capacity direct current sampling circuit is characterized in that alternating current sent by a generator is subjected to voltage reduction through a small transformer and then is converted into a direct current signal through a small three-phase rectifier bridge, and the direct current signal is sampled by a controller and used as feedback of an outer ring. The change of the rotating speed of the generator causes the change of the terminal voltage to be completely reflected to the direct current signal. The controller adjusts the size of the exciting current according to the direct current voltage signal, so that the line voltage of the generator is stabilized at 430V.
Example (b):
the vehicle power controller uses TI's DSP chip TMS320F28335, which controls all switching logic and PWM outputs, including the PWM output of the excitation power supply. The front stage is a rectification and excitation power supply which controls the terminal voltage of the generator and uncontrollable rectification; the later stage is inversion, and the direct-current voltage is inverted into 380V three-phase alternating current to be output to a load. The direct current input of the excitation power supply is provided by a generator coaxial with the generator, is stabilized at 80V by a stabilized voltage supply, and outputs controlled excitation current to be provided for an excitation loop of the generator through an excitation bridge circuit, so that the voltage of the output end of the generator is stabilized at 430V. This gives a 50V accommodation.
When the generator rotates at 500 revolutions from low to 3000 revolutions at high speed, corresponding exciting current can be added to output terminal voltage of 430V. The excitation system in the generator remains approximately linear, so that the highest and lowest excitation currents differ by a factor of 6. The excitation current was set to 6A at the maximum rotation speed and 1A at the minimum rotation speed. At idle, approximately one third of the current, i.e. a minimum of 0.33A of the field current, is suitable for both the generator and the field power supply.
The excitation power supply is formed by connecting 4 MOS tubes with voltage resistance of 200V and 4 diodes in parallel to a direct current support capacitor, and no inductor is needed for output, because the excitation loop of the generator is a large inductor. The excitation inductance of the generator in this embodiment is 0.3 mH. The large inductance causes the response of the exciting current to be slow, and the solution is to increase the exciting dc input voltage, and the dc voltage is 80V in this embodiment. The other method is to reasonably design the controller and carefully debug to obtain the optimal parameters. By simulating a bode plot, the fastest set of parameters is found given a suitable stability margin. And then the variable parameter design of the sudden load reduction is matched to achieve the aim of quick excitation.
And the small-capacity direct current sampling circuit provides direct current voltage feedback of the outer ring. The sampling circuit is connected before the reactance, as shown in figure 2. The voltage at the generator end is reduced to low voltage by a small transformer of 430/30, alternating current is rectified into direct current by a three-phase bridge rectifier circuit consisting of six diodes, and then a capacitor and a dissipation resistor are connected in parallel. The capacitor is a 47uF electrolytic capacitor with voltage resistance of 50V for filtering; the dissipation resistance is a cement resistance of 100 Ω of 25W for dissipating electrical energy in the event of a voltage drop in order to quickly track the voltage change.
The double closed-loop control system is formed by an exciting current inner loop and a direct current outer loop. The given value of the direct current outer ring is set as 608V (430V 1.414), the direct current outer ring is output to the inner ring after passing through the PI controller and serves as the given value of the inner ring, the feedback of the inner ring is exciting current, and the exciting current is output to the MOS tube PWM signal of the bridge circuit of the exciting power supply through the PI controller to control the exciting current and further control the voltage of the output end of the generator.
The controller sends three-phase SPWM and third harmonic to the inverter circuit, and the inverter circuit inverts the straight direct current into stable alternating current under the control of the three-phase SPWM and the third harmonic. The purpose of generating the third harmonic is to increase the dc utilization by 15%. In order to accurately control the output voltage and achieve a higher check level, the three controllers respectively perform PI control on three-phase alternating current formed by inverter inversion and then output the three-phase alternating current to a load, and the output amplitude limit of the PI control is 5%, namely the output amplitude limit is only 5% of the adjustment range.
Through experiments and theoretical calculation. And the double outer rings are used for controlling, so that the vehicle-mounted power supply achieves a better control effect. The full load sudden-increase sudden-decrease load test meets the national standard requirements of drop of less than 10% and less than 0.5S.
The invention connects a path of rectifying and filtering circuit from the terminal voltage for sampling only, because the sampling is only carried out, no power requirement is required, and all the devices only need to be very small. The sampling is also direct current voltage, has small fluctuation and good stability, and can completely replace the direct current voltage of the main circuit as an outer ring. Because the filter capacitor is very small, the voltage rises and falls very fast, and the risk of voltage rise is greatly reduced. The circuit has no braking branch and corresponds completely to the terminal voltage at any time. The outer ring only uses the voltage, double outer ring switching is not needed, the model is simple, the optimal parameters are convenient to call, and the rapidity and the stability of the system are greatly enhanced.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (5)
1. The utility model provides a power take-off vehicle power supply system that DC voltage sampling circuit realized which characterized in that includes: the device comprises a rectifier diode, a direct current capacitor, an inverter circuit, a controller, an excitation power supply and a small-capacity direct current sampling circuit; wherein the content of the first and second substances,
the rectifier diode receives alternating current generated by the generator, rectifies the alternating current into direct current with pulsation, and outputs the direct current to the direct current capacitor;
the direct current capacitor carries out filtering processing on the received direct current with the pulsation to obtain straight direct current, and the straight direct current is output to the inverter circuit;
the inverter circuit inverts the straight direct current into stable alternating current for external load under the control of the controller;
the small-capacity direct current sampling circuit collects the voltage of alternating current generated by the generator in real time and converts the voltage into sampling direct current;
the controller collects the voltage of the sampling direct current of the small-capacity direct current sampling circuit, the voltage of the straight direct current output to the inverter circuit by the direct current capacitor, the current of an external load and the exciting current output to the generator by the exciting power supply in real time, monitors the variation trends of the two voltages of the voltage of the sampling direct current and the voltage of the straight direct current, controls the exciting power supply to increase or decrease the exciting current according to the variation trends, and transmits the increased or decreased exciting current to the generator; wherein the content of the first and second substances,
the small-capacity direct current sampling circuit comprises a dissipation resistor R, a filter capacitor C, a three-phase rectifying circuit and a transformer T; the transformer T input is connected with the motor terminal voltage, the output is connected with the three-phase rectifying circuit, and the output of the three-phase rectifying circuit is connected with the filter capacitor C and then connected with the dissipation resistor R;
the three-phase rectifying circuit comprises a rectifying diode D1, a rectifying diode D2, a rectifying diode D3, a rectifying diode D4, a rectifying diode D5 and a rectifying diode D6; wherein the content of the first and second substances,
the rectifier diode D1 and the rectifier diode D2 are connected in series to form a first rectifying branch, the rectifier diode D3 and the rectifier diode D4 are connected in series to form a second rectifying branch, and the rectifier diode D5 and the rectifier diode D6 are connected in series to form a third rectifying branch; the first rectifying branch, the second rectifying branch and the third rectifying branch are connected in parallel;
the filter capacitor C is: c > -13.24/{ f × (U/I) × ACv }; wherein C is a filter capacitor and the unit is F; f is the pulse frequency of the rectifier circuit, in Hz; u is the maximum output voltage of the rectifying circuit, and the unit is V; i is the maximum output current of the rectifying circuit, and the unit is A; acv is the waviness coefficient;
the relationship between the voltage of the sampled dc and the voltage of the flat dc is:
U dc(real) ＝k (s) ×U dc(s) +b (s) ；
wherein s is n ＜s＜s n+1 ，n＝1、2、3、4、5，U dc(real) Voltage of a flat direct current, U dc(s) For sampling the DC voltage, s is the value in a segment, s n Is a starting value of a segment, s n+1 N is the number of voltage value segments.
2. The power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit according to claim 1, characterized in that: when the two voltages are reduced, controlling the excitation power supply to increase the excitation current and transmitting the increased excitation current to the generator; when the two voltages are increased, the excitation power supply is controlled to reduce the excitation current, and the reduced excitation current is transmitted to the generator.
3. A power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit according to claim 1, characterized in that: the function of the dissipation resistor R is to dissipate the energy of the filter capacitor, and considering that the dissipation resistor power cannot be too large, the dissipation resistor power cannot be greater than 40W.
4. A power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit according to claim 1, characterized in that: the controller adopts a double-closed-loop control mode to obtain an exciting current output instruction, the double closed loop comprises an inner loop and an outer loop, wherein the inner loop is an exciting current loop, the outer loop is a direct current voltage loop, and the controller, an exciting power supply, the generator and the small-capacity direct current sampling circuit form a double closed loop.
5. The power take-off vehicle-mounted power supply system realized by the direct-current voltage sampling circuit according to claim 4, characterized in that: the control method of the controller is as follows:
(1) the controller collects direct current voltage and exciting current output by an exciting power supply to the generator in real time, performs PID control on the outer ring according to the direct current voltage, and outputs an exciting current adjusting instruction to the inner ring;
(2) the controller carries out PI control on the inner ring according to the exciting current adjusting instruction and the real-time exciting current output to the generator by the exciting power supply to obtain a duty ratio instruction of the exciting power supply, and the exciting power supply outputs corresponding exciting current to the generator according to the duty ratio instruction.
Priority Applications (1)
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| CN100525066C (en) * | 2008-02-02 | 2009-08-05 | 南京航空航天大学 | DC power generation system for two-channel output electric excitation dual protrusion pole motor |
| CN101610062A (en) * | 2009-07-15 | 2009-12-23 | 南京航空航天大学 | Self-excitation mixed-excitation synchronous motor alternating current power-generating system and control method thereof |
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| CN102130644B (en) * | 2011-04-21 | 2013-03-20 | 阳光电源股份有限公司 | Exciting method, device and system of direct-current brushless synchronous wind driven generator |
| CN103095202A (en) * | 2011-10-31 | 2013-05-08 | 戴树梅 | Synchronous generator inversion-type excitation system |
| JP5830443B2 (en) * | 2012-06-28 | 2015-12-09 | 株式会社日立製作所 | Railway vehicle drive system |
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