CN117650723A - Armature current minimization power generation control method for multi-stage starting power generation system - Google Patents
Armature current minimization power generation control method for multi-stage starting power generation system Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000005284 excitation Effects 0.000 claims abstract description 25
- 230000004907 flux Effects 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The invention relates to a method for controlling armature current minimization power generation of a multistage starting power generation system, wherein a direct-axis current reference value of a main motor is calculated and determined in real time by an armature current minimization calculation formula by adopting an excitation flux linkage and a quadrature-axis current reference value. As can be seen from fig. 9, in the wide rotation speed power generation operation range of 6000-12000r/min, the armature current of the main motor is smaller than that of the traditional method.
Description
Technical Field
The invention belongs to the field of motor voltage stabilizing power generation control methods, relates to a armature current minimization power generation control method of a multi-stage starting power generation system, and particularly relates to a armature current minimization voltage stabilizing power generation control method of the multi-stage starting power generation system within a wide rotating speed range.
Background
The aviation starting and power generation integrated system integrates the functions of starting and onboard power supply of the aero-engine, omits a special starting mechanism for the aero-engine in the traditional system, and has important significance for reducing the volume and weight of the system and improving the integration level. In the conventional multistage high-voltage direct-current starting power generation system based on a diode uncontrolled rectifier, the power generation voltage stabilizing control in the wide rotating speed range is realized only through excitation adjustment of an exciter, and the armature current of a main motor is uncontrollable, so that the armature current of the system cannot be kept to be minimized in the wide rotating speed range of power generation. The minimized control of the armature current of the main motor in the power generation stage can effectively reduce the armature current and the copper consumption of the stator of the main motor, and has important significance for reducing the burden of power devices of a controller, reducing the heat of the stator and improving the operation efficiency of a system.
The multistage starting power generation system adopting the controllable rectifying circuit can control the armature current of the main motor in real time in the power generation stage. In the power generation voltage stabilization control of the system, because the main motor is a salient pole motor and the weak magnetism is required when the main motor runs at a high rotating speed, the armature current of the main motor cannot be minimized within a wide rotating speed range by adopting a traditional main motor id=0 control strategy. Aiming at the armature current minimization requirement in the wide-rotating-speed voltage-stabilizing power generation control of a multistage high-voltage direct-current starting power generation system adopting a controllable rectifying circuit, the invention provides a main motor armature current minimization control method in a wide rotating-speed range.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a method for controlling the armature current minimization power generation of a multistage starting power generation system, which aims at solving the problem that how to realize the minimization of the armature current of a main motor while ensuring the stable voltage output of the system in a wide rotating speed range.
Technical proposal
The armature current minimized power generation control method for the multistage starting power generation system is characterized by comprising the following steps of:
step 1: the measuring system outputs a DC voltage U DC Three-phase output current and voltage i of main motor of system abc 、u abc Excitation current i of system exciter ef Converting the measured three-phase armature voltage and current of the main motor into u under the dq axis coordinate system through coordinate transformation by utilizing the rotor position information d 、u q And i d 、i q ；
Step 2: outputting the system with DC voltage U DC And output voltage set point U DC * The difference is made, the difference result is input to a voltage regulator, and the voltage regulator outputs a q-axis current reference value i of the main motor q * ；
Step 3: and (3) estimating the excitation flux linkage of the main motor by using the armature voltage and current of the main motor under the dq axis coordinate obtained in the step (1) and the motor rotating speed information:
wherein: l (L) d 、R s 、ω e The direct-axis inductance, the stator resistance and the rotating speed of the main motor are respectively;
determining a d-axis current reference value of a main motor:
step 4: the q-axis current reference value determined in the step 2 is differenced with the q-axis current measurement value, and the difference result is input into a current regulator, and the current regulator outputs a q-axis voltage reference value u q * ；
The d-axis current reference value determined in the step 3 is differenced with the d-axis current measurement value, and the difference result is input into a current regulator, and the current regulator outputs a d-axis voltage reference value u d * ；
Step 5: u obtained in step 4 d * 、u q * The magnitude of the vector is formed; the amplitude of the vector is compared with a voltage limit value U determined according to the voltage of the output direct current bus max Performing difference making, and inputting a difference making result to the exciting current regulator;
the exciting current regulator outputs exciting current reference value i of exciter ef * ；
And the exciting current reference value and the measured value i of the exciter are used for ef Performing difference making, and inputting a difference making result to an excitation voltage regulator so as to adjust excitation voltage of an exciter, so as to adjust excitation flux linkage of a main motor, and enable the main motor to run on a voltage limit circle;
step 6: the obtained dq axis voltage reference value u d * 、u q * U obtained by performing Park inverse transformation ɑ 、u β And SVPWM waves are generated, and the SVPWM waves are used for driving the three-phase full-bridge controllable rectifier, so that voltage-stabilizing output in a wide rotating speed range of the system is realized.
The output DC voltage U DC Three-phase output voltage u of main motor of system abc Measured with a voltage sensor.
Three-phase output current i of main motor of system abc Excitation current i of system exciter ef Measured with a current sensor.
The rotor position information is measured using a resolver for rotor position information and system rotational speed information.
The voltage regulator includes a PID regulator or a fuzzy control regulator.
The current regulator includes a PID regulator or a fuzzy control regulator.
Advantageous effects
The invention provides a method for controlling armature current minimization power generation of a multistage starting power generation system, wherein a direct-axis current reference value of a main motor is calculated and determined in real time by an armature current minimization calculation formula by adopting an excitation flux linkage and a quadrature-axis current reference value. As can be seen from fig. 9, in the wide rotation speed power generation operation range of 6000-12000r/min, the armature current of the main motor is smaller than that of the traditional method.
Drawings
FIG. 1 is a schematic diagram of a power generation stage of an aviation multistage power generation system;
FIG. 2 is a schematic block diagram of a main motor armature current minimization control;
FIG. 3 is a main motor quadrature current waveform;
FIG. 4 is a main motor flux linkage waveform;
FIG. 5 is a main motor direct current waveform;
FIG. 6 is an exciter field current waveform;
FIG. 7 is a graph showing the effective value of one phase armature current of the main motor at a constant rotational speed (8000 r/min);
FIG. 8 is a waveform of the system output DC voltage;
FIG. 9 shows the effect of the conventional method at different speeds (6000-12000 r/min) compared with the method according to the invention.
Detailed Description
The invention will now be further described with reference to examples, figures:
a voltage-stabilizing power generation control method for minimizing armature current in a wide rotating speed range of a multistage high-voltage direct-current starting power generation system adopting a controllable rectifying circuit is characterized by comprising the following steps of: the multistage high-voltage direct-current starting power generation system adopting the controllable rectifying circuit comprises a main motor and an exciter which are coaxially arranged, wherein the main motor is an electric excitation synchronous motor, the exciter is a pivoting electric excitation synchronous generator, and an exciter rotor three-phase winding is connected with a main motor rotor excitation winding through a rotary rectifier;
in the embodiment, a two-stage brushless synchronous motor is adopted. The following will describe in detail a case where the motor is operated at 8000r/min and 270V is output from the dc side, and a schematic block diagram is shown in fig. 2.
The exciter provides direct current excitation for the main motor through the rotary rectifier in the power generation stage of the system, and the stator three-phase winding of the main motor outputs high-voltage direct current through the three-phase full-bridge controllable rectifying circuit. The armature current minimization voltage-stabilizing power generation control method in the wide rotating speed range comprises the following steps:
step one: the method for measuring and acquiring the information of the current, the voltage, the rotor position and the like of the motor through the sensor and processing the information comprises the following steps: the voltage sensor is used for measuring the output direct current voltage of the system and is recorded as U DC The method comprises the steps of carrying out a first treatment on the surface of the The three-phase output current and voltage of the main motor of the system are measured by a current sensor and a voltage sensor and are marked as i abc 、u abc The method comprises the steps of carrying out a first treatment on the surface of the The exciting current of the exciter of the system is measured by a current sensor and is marked as i ef The method comprises the steps of carrying out a first treatment on the surface of the Rotor position information and system rotational speed information are measured using a resolver. Converting the measured three-phase armature voltage and current of the main motor into the dq axis coordinate system by using the rotor position information, and respectively recording as u d 、u q And i d 、i q 。
Step two: the q-axis current reference value of the main motor is determined, specifically: outputting the direct current voltage U from the system measured in the step one DC And output voltage set point (U) DC * ) The difference is made, the difference result is input to a voltage regulator, and the voltage regulator outputs a q-axis current reference value (i q * ). Including but not limited to PID regulators, fuzzy control regulators, etc.
Under the working conditions of given rotating speed and loadOutput voltage U dc And output voltage set point (U) ref ) And (3) performing difference, inputting a difference result into the PI regulator to obtain a given value of the quadrature current, and performing closed-loop regulation of the quadrature current, wherein the waveform of the quadrature current is shown in figure 3.
Step three: estimating excitation flux linkage of a main motor and determining a d-axis current reference value of the main motor, wherein the method specifically comprises the following steps: estimating a main motor excitation flux linkage according to the following formula by using the main motor armature voltage and current and motor rotation speed information under the dq axis coordinate obtained in the step one, wherein L d 、R s 、ω e The direct-axis inductance, the stator resistance and the rotating speed of the main motor are respectively. The estimated flux linkage waveform is shown in fig. 4.
And then determining a d-axis current reference value of the main motor according to the following formula based on the estimated excitation flux linkage and the q-axis current reference value determined in the step two:
the resulting direct current waveform is shown in fig. 5.
Step four: determining a voltage reference value of a dq axis of a main motor, specifically: the q-axis current reference value determined in the second step is differenced with the q-axis current measurement value, and the difference result is input into a current regulator, and the current regulator outputs a q-axis voltage reference value u q * The method comprises the steps of carrying out a first treatment on the surface of the The d-axis current reference value determined in the third step is differenced with the d-axis current measurement value, and the difference result is input into a current regulator, and the current regulator outputs a d-axis voltage reference value u d * 。
Including but not limited to PID regulators, fuzzy control regulators, etc.
Step five: the main motor is operated on a voltage limit circle through exciting current adjustment of an exciter, specifically: and u is obtained in the step four d * 、u q * The amplitude of the vector formed and the voltage limit value U determined by the output DC bus voltage max Making a difference, inputting the difference result to an exciting current regulator, and outputting an exciting current reference value i of the exciter by the exciting current regulator ef * The method comprises the steps of carrying out a first treatment on the surface of the And the exciting current reference value and the measured value i of the exciter are used for ef And performing difference making, and inputting a difference making result into an excitation voltage regulator so as to adjust excitation voltage of an exciter, thereby adjusting excitation flux linkage of the main motor and enabling the main motor to run on a voltage limit circle.
Step six: the obtained dq axis voltage reference value u d * 、u q * U obtained by performing Park inverse transformation ɑ 、u β And the SVPWM wave is generated to drive the three-phase full-bridge controllable rectifier, so that the voltage-stabilizing output of the system in a wide rotating speed range is realized.
The exciting current waveform of the exciter is shown in fig. 6, the effective value waveform of the one-phase armature current of the main motor is shown in fig. 7, and the output direct-current voltage waveform of the system is shown in fig. 8. The invention can realize the minimum armature current in a wide rotating speed range, under the condition that the system has different running rotating speeds (6000-12000 r/min) and outputs 270V direct current voltage with the same load, the armature current pairs are shown in figure 9 when the traditional method and the armature current minimization method are adopted, and the armature current of the main motor is smaller than that when the traditional method is adopted.
Claims (6)
1. The armature current minimized power generation control method for the multistage starting power generation system is characterized by comprising the following steps of:
step 1: the measuring system outputs a DC voltage U DC Three-phase output current and voltage i of main motor of system abc 、u abc Excitation current i of system exciter ef Converting the measured three-phase armature voltage and current of the main motor into u under the dq axis coordinate system through coordinate transformation by utilizing the rotor position information d 、u q And i d 、i q ；
Step 2: outputting the system with DC voltage U DC And output voltage set point U DC * The difference is made, the difference result is input to a voltage regulator, and the voltage regulator outputs a q-axis current reference value i of the main motor q * ；
Step 3: and (3) estimating the excitation flux linkage of the main motor by using the armature voltage and current of the main motor under the dq axis coordinate obtained in the step (1) and the motor rotating speed information:
wherein: l (L) d 、R s 、ω e The direct-axis inductance, the stator resistance and the rotating speed of the main motor are respectively;
determining a d-axis current reference value of a main motor:
step 4: the q-axis current reference value determined in the step 2 is differenced with the q-axis current measurement value, and the difference result is input into a current regulator, and the current regulator outputs a q-axis voltage reference value u q * ；
The d-axis current reference value determined in the step 3 is differenced with the d-axis current measurement value, and the difference result is input into a current regulator, and the current regulator outputs a d-axis voltage reference value u d * ；
Step 5: u obtained in step 4 d * 、u q * The magnitude of the vector is formed; the amplitude of the vector is compared with a voltage limit value U determined according to the voltage of the output direct current bus max Performing difference making, and inputting a difference making result to the exciting current regulator;
the exciting current regulator outputs exciting current reference value i of exciter ef * ；
And the exciting current reference value and the measured value i of the exciter are used for ef Performing difference making, inputting a difference making result into an excitation voltage regulator so as to adjust excitation voltage of an exciter, and adjusting excitation flux linkage of a main motor so that the main motor operates at the voltageLimit circle;
step 6: the obtained dq axis voltage reference value u d * 、u q * U obtained by performing Park inverse transformation ɑ 、u β And SVPWM waves are generated, and the SVPWM waves are used for driving the three-phase full-bridge controllable rectifier, so that voltage-stabilizing output in a wide rotating speed range of the system is realized.
2. The armature current minimizing power generation control method of a multistage start power generation system according to claim 1, characterized in that: the output DC voltage U DC Three-phase output voltage u of main motor of system abc Measured with a voltage sensor.
3. The armature current minimizing power generation control method of a multistage start power generation system according to claim 1, characterized in that: three-phase output current i of main motor of system abc Excitation current i of system exciter ef Measured with a current sensor.
4. The armature current minimizing power generation control method of a multistage start power generation system according to claim 1, characterized in that: the rotor position information is measured using a resolver for rotor position information and system rotational speed information.
5. The armature current minimizing power generation control method of a multistage start power generation system according to claim 1, characterized in that: the voltage regulator includes a PID regulator or a fuzzy control regulator.
6. The armature current minimizing power generation control method of a multistage start power generation system according to claim 1, characterized in that: the current regulator includes a PID regulator or a fuzzy control regulator.
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| CN202311460011.3A CN117650723A (en) | 2023-11-04 | 2023-11-04 | Armature current minimization power generation control method for multi-stage starting power generation system |
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