CN107743002B - Method for dynamically adjusting excitation input voltage of aviation three-stage variable frequency alternating-current generator - Google Patents
Method for dynamically adjusting excitation input voltage of aviation three-stage variable frequency alternating-current generator Download PDFInfo
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- CN107743002B CN107743002B CN201711095539.XA CN201711095539A CN107743002B CN 107743002 B CN107743002 B CN 107743002B CN 201711095539 A CN201711095539 A CN 201711095539A CN 107743002 B CN107743002 B CN 107743002B
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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
- H02P9/305—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 controlling voltage
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Abstract
The invention discloses a dynamic adjusting method for excitation input voltage of an aviation three-stage variable frequency alternating-current generator, and belongs to the technical field of digital voltage adjustment. The invention adopts the technical scheme that a three-phase PWM controllable rectifying circuit is adopted to adjust the excitation input voltage, and in the adjusting process, a method for changing the voltage reference value in real time according to the rotating speed is invented. The invention can dynamically adjust the excitation input voltage according to the current rotating speed in the aviation three-stage variable frequency alternating current generator. Particularly, under high rotating speed, the technical method of the invention is adopted to reduce the excitation input voltage and reduce the requirement on the switching characteristic of the power tube. In the digital voltage regulation technology of the aviation three-stage variable frequency alternating current generator, the excitation input voltage is dynamically regulated, and the phenomenon of unloading transient voltage overshoot during the full-speed running of the motor can be effectively relieved.
Description
Technical Field
The invention discloses a dynamic adjusting method for excitation input voltage of an aviation three-stage variable frequency alternating-current generator, and belongs to the technical field of digital voltage adjustment.
Background
For aircraft systems, the power supply system carries over the power supply function of the aircraft. The voltage regulation mode of the airplane power supply system comprises an analog voltage regulation mode and a digital voltage regulation mode. The analog voltage regulator has inherent disadvantages of an analog circuit, such as difficult parameter adjustment, difficult acquisition of circuit parameters used in various states, and the like. In recent years, digital control technology is rapidly developed, and the trend of realizing digital control of the aircraft generator is inevitable.
The digital voltage regulator is based on the principle that the output voltage of the generator is sampled and converted into a digital signal by an a/D conversion module after passing through a detection and conditioning circuit. According to the digital quantity, a proper control algorithm is adopted to generate PWM waves, and the on-off state of a power tube in the excitation loop is controlled after power amplification. The three-phase output voltage of the permanent magnet motor is rectified and filtered to be used as an excitation source. The control algorithm tracks the change of the output voltage and changes the duty ratio of PWM, thereby adjusting the size of the exciting current and achieving the purpose of stabilizing the output voltage. As shown in particular in figure 1. It can be seen that the excitation source, i.e. the rectified and filtered three-phase output voltage of the permanent magnet motor, is very important in the digital voltage regulator.
In the wide frequency conversion alternating current three-level motor, the rotating speed variation range of the generator is large. Along with the increase of the rotating speed of the motor, the voltage of the permanent magnet motor increases, the amplification effect of the excitation is also enhanced, and therefore the power of the main generator is increased. Because the short-time load carrying capacity of twice rated load needs to be met in a low rotating speed range during motor design, the voltage of a permanent magnet machine is generally designed to be higher in the design of a wide-frequency-conversion alternating-current three-level motor. Therefore, when the motor runs at a high rotating speed, the voltage of the permanent magnet motor is too high, the control algorithm of the digital voltage regulator generates a PWM wave with too small duty ratio, namely, the duty ratio of a power tube driving signal for controlling an excitation switch is too small (generally less than 3%), so that the power tube generates heat seriously, the loss is too large, the failure rate is high, the efficiency is low, the service life is shortened, and even effective switching action cannot be completed in one period. However, most of the current aviation variable frequency ac power generation systems do not adopt any regulation control strategy for the rectified voltage (i.e., the excitation input voltage) of the permanent magnet machine, such as a three-phase uncontrollable rectification circuit structure shown in fig. 2. Therefore, the technical problem that the excitation input voltage cannot be dynamically adjusted exists in the prior art.
Disclosure of Invention
The purpose of the invention is as follows: in the digital voltage regulation technology based on the aviation three-level variable frequency alternating current generator, the utilization rate of a power tube is improved on one hand by dynamically regulating the excitation input voltage, and the phenomenon of overshoot of transient voltage during digital voltage regulation and unloading is relieved on the other hand.
The technical scheme of the invention is as follows: the method for dynamically adjusting the excitation input voltage of the aviation three-level variable frequency alternating current generator is characterized by comprising the following steps of:
1) the output voltage of the permanent magnet machine is sampled and converted into digital quantity by an A/D conversion chip;
2) the DSP utilizes a control algorithm to generate PWM waves according to the digital quantity obtained in the step 1, and the PWM waves drive the switching state of a power tube in a rectification loop of the permanent magnet machine;
3) the control algorithm tracks the change of rectified voltage output by the three phases of the permanent magnet machine, changes the duty ratio of PWM waves, and controls the on-time and the off-time of a power tube by the PWM waves, thereby achieving the purpose of adjusting the excitation input voltage;
in the dynamic regulation process of the excitation input voltage, the voltage reference value is calculated according to the following formula according to different rotating speeds:
Udc_ref＝α-β*r4+*r3-σ*r2，
wherein U isdc_refThe reference voltage is a voltage reference value, alpha, beta and sigma are parameters to be set, and r is a rotating speed, so that the dynamic regulation of the excitation input voltage of the aviation three-stage variable frequency alternating-current generator at the full rotating speed is realized.
The invention has the advantages that: the embodiment of the invention provides a dynamic adjusting technology for excitation input voltage of an aviation three-stage variable frequency alternating-current generator.
1) In the aviation three-stage variable frequency alternating current generator, the excitation input voltage can be dynamically adjusted according to the current rotating speed. Under high rotating speed, the technical method of the invention is adopted to reduce the excitation input voltage, thereby inhibiting the overhigh excitation input voltage caused by the rising of the rotating speed, preventing the duty ratio of the power tube driving signal for controlling the excitation switch from being overlow, reducing the requirement on the switching characteristic of the power tube, and effectively solving the problems of frequent switching of the power tube, serious heat productivity, high failure rate and short service life under the high rotating speed.
2) In the digital voltage regulation technology of the aviation three-stage variable frequency alternating-current generator, three-phase output voltage of a permanent magnet motor is rectified and filtered to serve as an excitation source, excitation input voltage is dynamically regulated, and the phenomenon of unloading transient voltage overshoot during full-speed running of the motor can be effectively relieved to a certain extent.
Drawings
FIG. 1 is a control schematic diagram of a prior art digital voltage regulator
FIG. 2 is a structural diagram of a permanent magnet motor output three-phase uncontrollable rectification circuit in the prior art
FIG. 3 is a structural diagram of a three-phase PWM controllable rectifier circuit in the invention
FIG. 4 is a schematic diagram of dynamically adjusting the excitation input voltage in accordance with the present invention
FIG. 5 is a schematic block diagram of a prior art control system
Detailed Description
The method for dynamically adjusting the excitation input voltage of the aviation three-level variable frequency alternating current generator is characterized by comprising the following steps of:
1) the output voltage of the permanent magnet machine is sampled and converted into digital quantity by an A/D conversion chip;
2) the DSP utilizes a control algorithm to generate PWM waves according to the digital quantity obtained in the step 1, and the PWM waves drive the switching state of a power tube in a rectification loop of the permanent magnet machine;
3) the control algorithm tracks the change of rectified voltage output by the three phases of the permanent magnet machine, changes the duty ratio of PWM waves, and controls the on-time and the off-time of a power tube by the PWM waves, thereby achieving the purpose of adjusting the excitation input voltage;
in the dynamic regulation process of the excitation input voltage, the voltage reference value is calculated according to the following formula according to different rotating speeds:
Udc_ref＝α-β*r4+*r3-σ*r2，
wherein U isdc_refThe reference voltage is a voltage reference value, alpha, beta and sigma are parameters to be set, and r is a rotating speed, so that the dynamic regulation of the excitation input voltage of the aviation three-stage variable frequency alternating-current generator at the full rotating speed is realized.
The present invention will be described in further detail with reference to the accompanying drawings.
In the prior art, a three-phase uncontrollable rectifying circuit shown in fig. 2 is adopted, and as can be seen from fig. 2, a permanent magnet machine outputs three-phase voltage and is directly used as an excitation source of a system through a rectifying circuit formed by rectifying diodes without control function, when the system runs at a high rotating speed, the excitation voltage is possibly too high, and the PWM duty ratio generated by a control algorithm of a digital voltage regulator becomes very small, so that the power tube is seriously heated and the loss is large.
In order to solve the problem, the invention adopts a three-phase PWM controllable rectifying circuit which can dynamically adjust the excitation input voltage, and as shown in figure 4, the output voltage of the permanent magnet machine converts the analog quantity into the digital quantity through an A/D conversion chip. The DSP utilizes a proper control algorithm to generate PWM waves according to the digital quantity so as to drive the switching state of a power tube in a rectification loop of the permanent magnet machine. Rectified voltage U of three-phase output of control algorithm tracking permanent magnet motordcIn the context of the variations of (a),and changing the duty ratio of PWM, and controlling the on-time and the off-time of the power tube according to different duty ratios, thereby achieving the purpose of adjusting the excitation input voltage.
Fig. 5 is a schematic block diagram of the control system. U shapedc_refIs a reference voltage, UdcIs the voltage to be regulated, i.e. the excitation input voltage. In the wide frequency conversion alternating current three-level motor, the rotating speed variation range of the generator is large. To realize that the system can adjust the excitation input voltage in real time at different rotating speeds. To this end, the present invention is directed to a reference voltage U in the control system of FIG. 5dc_refA treatment process is given as in formula (1).
Udc_ref＝α-β*r4+*r3-σ*r2 (1)
Wherein r is 0.001 time of the rotating speed of the motor, and alpha, beta, sigma are coefficients to be set.
Setting four coefficients of alpha, beta and sigma according to different requirements of excitation input voltage in different rotating speed ranges, so that the rotating speed r of the motor and the reference voltage U are enabled to be equaldc_refThere is a non-linear correspondence between them. As can be seen from the formula (1), when the rotation speed changes, Udc_refThe voltage changes along with the change, thereby achieving the purpose of dynamically adjusting the excitation input voltage of the aviation three-stage variable frequency alternating current generator at the full rotating speed.
Claims (1)
1. The method for dynamically adjusting the excitation input voltage of the aviation three-level variable frequency alternating current generator is characterized by comprising the following steps of:
1) the output voltage of the permanent magnet machine is sampled and converted into digital quantity by an A/D conversion chip;
2) rectifying the digital quantity obtained in the step 1 by a controllable rectifying circuit;
3) the DSP utilizes a control algorithm to generate PWM waves according to the rectified voltage value, the control algorithm tracks the change of the rectified voltage output by the three-phase permanent magnet motor, and the duty ratio of the PWM waves is changed through the comparison result of the rectified voltage and the parameter voltage reference value, and the PWM waves control the on-time and the off-time of the power tube, so that the excitation input voltage is adjusted;
the parameter voltage reference value in the control algorithm is calculated according to the following formula according to different rotating speeds:
Udc_ref＝α-β*r4+*r3-σ*r2
wherein, the reference value of the voltage is the parameter to be set, and r is 0.001 time of the rotating speed.
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| CN110661460B (en) * | 2019-11-13 | 2022-02-22 | 陕西航空电气有限责任公司 | Digital voltage regulating device of wide frequency conversion alternating current generator for aviation |
| CN112542969B (en) * | 2020-12-11 | 2023-02-07 | 陕西航空电气有限责任公司 | Effective value voltage regulating circuit for aviation high-power variable-frequency alternating-current power generation system |
| CN113472256B (en) * | 2021-07-05 | 2023-02-10 | 西北工业大学 | Rotor position estimation method of excitation controller of aviation three-stage starting power generation system |
| CN115528957A (en) * | 2022-10-02 | 2022-12-27 | 陕西航空电气有限责任公司 | Method for improving stability of voltage regulator of small duty ratio synchronous generator and voltage regulator circuit |
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