CN108696218B - Parallel operation control method for direct-current power generation system of double-winding induction generator - Google Patents
Parallel operation control method for direct-current power generation system of double-winding induction generator Download PDFInfo
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- CN108696218B CN108696218B CN201810550615.XA CN201810550615A CN108696218B CN 108696218 B CN108696218 B CN 108696218B CN 201810550615 A CN201810550615 A CN 201810550615A CN 108696218 B CN108696218 B CN 108696218B
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- 238000004804 winding Methods 0.000 title claims abstract description 48
- 230000006698 induction Effects 0.000 title claims abstract description 34
- 238000010248 power generation Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000009466 transformation Effects 0.000 claims abstract description 4
- 230000033228 biological regulation Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 101100028920 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) cfp gene Proteins 0.000 description 15
- 238000011217 control strategy Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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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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Abstract
The invention discloses a parallel operation control method for a direct current power generation system of a double-winding induction generator, belongs to the technical field of power generation, power transformation or power distribution, and particularly relates to a parallel control method for a ship independent power supply system. The method controls a main generator to stably output direct current according to a direct current voltage given value, updates the idle load voltage of a secondary generator according to the direct current voltage given value and active power required to be output by the secondary generator, updates the quantity deviating from the direct current voltage given value actually output by the secondary generator according to the idle load voltage updated value and the active power actually output by the secondary generator, controls the secondary generator to stably output the direct current according to the quantity deviating from the direct current voltage given value of the secondary generator and executes parallel operation when the two generators stably output the direct current voltage given value, can exert the advantages of a double-winding induction motor in an independent power supply system, reduces the difficulty of parallel control without increasing the volume of the generator in actual operation, and can adapt to the parallel operation of the double-winding induction generator in the fields of spaceflight, ships and.
Description
Technical Field
The invention discloses a parallel operation control method for a direct current power generation system of a double-winding induction generator, belongs to the technical field of power generation, power transformation or power distribution, and particularly relates to a parallel control method for a ship independent power supply system.
Background
In recent years, the rapid development of multi-electric airplanes, multi-electric ships and electric vehicles puts forward new requirements on independent power supply systems, such as high capacity, high performance, high power density and high efficiency. In the development process of power supply systems in the fields of airplanes, ships, automobiles and the like, direct-current power generation systems are adopted, and the direct-current power generation systems are more and more widely applied to independent power supply systems. The traditional induction generator system has the defects and shortcomings that the quality of power supply is poor due to the fact that a load is directly electrically connected with a power converter, the capacity of the converter is overlarge due to the fact that active power and reactive power of a motor winding pass through the power converter, and the like.
The parallel operation of the generators can improve the reliability of power supply, one generator fails to cause power supply failure of the whole system, the parallel operation can improve the total output power on the premise of not improving the direct-current voltage, and the control is easy.
The existing parallel connection method is not suitable for a direct current power generation system of a double-winding generator. The existing parallel technology requires that two or more generators execute parallel operation when the voltage is same in magnitude and phase, the frequency is same, the voltage waveform is same, and the phase sequence is same, so that the difficulty of controlling the parallel operation of the generators is increased, the volume of the generators in actual operation is also increased, and the parallel operation technology is not suitable for the requirements of the fields of spaceflight, ships and the like which are suitable for the double-winding induction generator. Therefore, it is necessary to develop a new control method suitable for the parallel operation of the dc power generation systems of the dual-winding induction generator.
Disclosure of Invention
The invention aims to provide a parallel operation control method of a direct current power generation system of a double-winding induction generator aiming at the defects of the background technology, so that the parallel operation of two double-winding induction generators is realized, and the technical problems of high control difficulty, increased volume in actual operation and the like caused by the prior parallel technology are solved.
The invention adopts the following technical scheme for realizing the aim of the invention:
the double-winding induction generator direct-current power generation system comprises a double-winding induction generator serving as a main generator and a double-winding induction generator serving as a slave generator, wherein the rated voltage of the two double-winding induction generatorsU dc The direct current power generation control strategies are the same, the parallel operation control method of the direct current power generation system of the double-winding induction generator controls the direct current output of the two double-winding induction generators based on the droop control principle, and parallel operation is executed when the direct current stably output by the two double-winding induction generators reaches the direct current given voltage.
Droop control of the main generator: calculating the required output DC voltage according to the droop curve of the main generatorU pDC1 *Corresponding power P1Product of droop coefficient K, main generator rated voltageU dc Minus power P1Product of droop coefficient KObtaining the given value of the DC voltageU pDC1 *Given value of DC voltageU pDC1 *With main generator DC bus voltageU pDC1 The difference value is regulated by PI to obtain the control winding of the main generatordSet value of shaft currentI cdc1 * 。
Droop control from generator: calculating a DC voltage setpoint from a generator droop curveU pDC1 *Plus the target power P requested from the generator2Multiplying the droop coefficient K to obtain the new no-load voltage of the slave generatorU pDC2 *New no-load voltage of slave generatorU pDC2 *Subtracting the actual output power P from the generator2mSubtracting the direct current bus voltage of the slave generator after multiplying the droop coefficient KU pDC2 Obtaining the deviation of the actual output of the generator from the given value of the direct current voltage, and performing PI regulation on the deviation of the actual output of the generator from the given value of the direct current voltage to obtain a control winding of the generatordSet value of shaft currentI cdc2 *。
Output voltage of main generator and auxiliary generatorU pDC1 、U pDC2 When the output voltage of the two generators is the same and is the set value of the direct current voltage, the direct current output ends of the slave generators are connected to a bus of the direct current output end of the main generator in parallel to finish the parallel operation. The two generators in parallel operation can distribute power according to instructions to realize parallel operation control.
By adopting the technical scheme, the invention has the following beneficial effects:
(1) the invention provides a novel parallel operation control method of a direct current power generation system of a double-winding induction generator, which controls a main generator to stably output direct current according to a direct current given value, updates the value of idle voltage of a slave generator according to the direct current given value and active power required to be output by the slave generator, updates the quantity deviating from the direct current given value actually output by the slave generator according to the idle voltage updated value of the slave generator and the active power actually output by the slave generator, controls the stable output of the direct current from the generators according to the quantity deviating from the direct current given value of the slave generator and executes parallel operation when the two generators stably output the direct current given value, can not only exert the advantages of the double-winding induction motor in an independent power supply system, but also avoid the defects of more parallel conditions of the traditional parallel method, reduce the difficulty of parallel control and simultaneously avoid increasing the volume of the generators in actual operation, the parallel operation of the double-winding induction generator in the fields of spaceflight, ships and the like can be adapted.
(2) The invention adopts the droop characteristic curve to realize parallel operation control, can realize accurate distribution of the output power of each generator, and improves the reliability and stability of the system.
Drawings
Fig. 1 is a schematic diagram of a dc power generation system with two double-winding induction generators operating in parallel.
Fig. 2 is a schematic diagram of a control strategy of a single double-winding induction generator direct-current power generation system.
FIG. 3 is a schematic diagram of droop characteristics for a master generator and a slave generator.
Detailed Description
The technical scheme of the invention is explained in detail in the following with reference to the attached drawings.
Two parallel double-winding induction generator direct current power generation systems are shown in figure 1, one double-winding induction generator serves as a main generator and is connected with a main generator droop controller, the other double-winding induction generator serves as a slave generator and is connected with a slave generator droop controller, when direct current voltages stably output by the two generators are the same, the direct current output ends of the slave generators are connected to a direct current output end bus of the main generator in parallel, and the two generators connected in parallel are connected to a direct current load.
The control strategy of the direct-current power generation system of the single double-winding induction generator is shown in fig. 2, and the two generators both adopt the same control strategy for controlling the flux linkage orientation of the windings. The control strategy is specifically realized as follows: the actual values of the DC voltage output by the generator and the SEC DC bus voltage are respectively fed with respective reference voltagesThe difference values are respectively processed by a proportional-integral regulator to obtain control windingsdShaft andqa given current of the shaft; and then, calculating a given value of the three-phase current of the control winding according to a coordinate transformation formula and the orientation angle, and further obtaining a power switch tube control signal for driving the SEC. Rated voltage of each generatorU dc Are all the same.
In the main generator droop curve, as shown in fig. 3, it is assumed that the main generator is required to output a dc voltageU pDC1 *At point A, the power is P1Calculating the power P1The product of the droop coefficient K.
As shown in fig. 1, the main generator is rated at this timeU dc Minus power P1The product of the droop coefficient K is used for obtaining the given value of the direct current voltageU pDC1 *Given value of DC voltageU pDC1 *With main generator DC bus voltageU pDC1 The difference value is regulated by PI to obtain the control winding of the main generatordShaft current set pointI cdc1 * The main generator SEC is driven by controlling the switch-off of the switch tube, and the direct-current voltage given value is output when the stability is stableU pDC1 *。
As shown in fig. 3, in the sag curve from the generator, it is assumed that the target power P is required to be output from the generator2If the direct current bus is connected in parallel to the main generator, the slave generator also needs to stably output a given direct current voltage valueU pDC1 *(corresponding to point B in the sag curve from the generator). At this time, the DC voltage set valueU pDC1 *Plus the target power P demanded from the generator output2Multiplying the droop coefficient K to obtain the new no-load voltage of the slave generatorU pDC2 *。
New no-load voltage of the slave generator as shown in fig. 1U pDC2 *Subtracting the actual output power P from the generator2mThe product of the droop coefficient K and the direct current bus voltage of the slave generator is subtractedU pDC2 Obtaining the deviation of the actual output of the generator from the given value of the direct current voltage, and performing PI regulation on the deviation of the actual output of the generator from the given value of the direct current voltage to obtain a control winding of the generatordSet value of shaft currentI cdc2 * The secondary generator SEC is driven by controlling the switch-off of the switching tube, and the given value of the direct-current voltage is output when the secondary generator SEC is stableU pDC1 *。
The main generator and the slave generator output stable direct current voltage set values simultaneouslyU pDC1 *And when the direct current output end of the slave generator is connected to the direct current bus of the direct current output end of the main generator in parallel. The two generators in parallel operation can distribute power according to instructions to realize parallel operation control, and the control method is also suitable for parallel operation of a plurality of double-winding induction generator direct-current power generation systems.
Claims (4)
1. A parallel operation control method for a double-winding induction generator DC power generation system is characterized in that one double-winding induction generator is used as a main generator, the other double-winding induction generators are used as auxiliary generators,
regulating d-axis current of a control winding of the main generator by adopting a droop control method according to a given value of direct current voltage, and carrying out SVPWM (space vector pulse width modulation) on the main generator according to the direct current voltage input by the control winding side of the main generator;
updating the idle load voltage of the slave generator according to the voltage corresponding to the target power required to be output from the generator droop curve and the given value of the direct current voltage, obtaining the amount of deviation from the actual output of the generator to the given value of the direct current voltage according to the difference between the updated value of the idle load voltage of the slave generator, the product of the actual output power of the slave generator and the droop coefficient and the actual output direct current voltage of the slave generator, carrying out PI regulation on the amount of deviation from the actual output of the generator to the given value of the direct current voltage to obtain d-axis current of a slave generator control winding, and carrying out SVPWM modulation on the slave generator according to the direct current voltage input from the side of the slave generator;
when the main generator and the slave generator stably output given direct-current voltage, the direct-current output end of the slave generator is connected to a direct-current bus of the direct-current output end of the main generator in parallel.
2. The parallel operation control method of the direct current power generation systems of the double-winding induction generators of claim 1, wherein the method for adjusting the d-axis current of the control winding of the main generator by adopting a droop control method according to the given value of the direct current voltage comprises the following steps: and determining a direct-current voltage given value according to the power corresponding to the direct-current voltage given value on the droop curve of the main generator and the rated voltage of the main generator, and carrying out PI regulation on the direct-current voltage given value and the difference value of the actual output of the main generator to update the d-axis current of the control winding of the main generator.
3. The parallel operation control method of the direct current power generation system of the double-winding induction generator as claimed in claim 1, wherein the droop coefficient K of the master/slave generator is: k ═ Δ Umax/ΔPmaxWherein, Δ UmaxIs the difference between the rated voltage of the master/slave generator and the corresponding voltage at the time of outputting the maximum power, delta PmaxThe maximum power output by the main/auxiliary generator.
4. The parallel operation control method of the direct current power generation system of the double-winding induction generator as claimed in claim 1, wherein the given values of the three-phase currents of the control windings of the master/slave generator are determined according to a coordinate transformation formula and an orientation angle in the process of performing SVPWM modulation on the master/slave generator.
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| CN102307036B (en) * | 2011-03-15 | 2013-06-19 | 隆鑫通用动力股份有限公司 | Control method and device for parallel running of internal combustion engine-driven generating sets |
| US9257838B2 (en) * | 2012-12-17 | 2016-02-09 | Ge Aviation Systems Llc | Circuit and method for allocating power among generators |
| CN103475290B (en) * | 2013-08-15 | 2016-04-20 | 江苏云意电气股份有限公司 | The universal voltage regulator of a kind of bi-motor shunt load equilibrium assignment |
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