RU2173020C2 - Power system with induction starter-generator - Google Patents

Power system with induction starter-generator Download PDF

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Publication number
RU2173020C2
RU2173020C2 RU97121766/09A RU97121766A RU2173020C2 RU 2173020 C2 RU2173020 C2 RU 2173020C2 RU 97121766/09 A RU97121766/09 A RU 97121766/09A RU 97121766 A RU97121766 A RU 97121766A RU 2173020 C2 RU2173020 C2 RU 2173020C2
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Russia
Prior art keywords
converter
input
control
output
terminals
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RU97121766/09A
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Russian (ru)
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RU97121766A (en
Inventor
В.М. Анисимов
П.Ю. Грачев
А.И. Скороспешкин
ров В.Н. Кудо
В.Н. Кудояров
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Самарский государственный технический университет
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Priority to RU97121766/09A priority Critical patent/RU2173020C2/en
Publication of RU97121766A publication Critical patent/RU97121766A/en
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Abstract

FIELD: power supplies for off-line loads such as motor cars to start drive engines. SUBSTANCE: system incorporating induction machine with semiconductor (valve-type) electrical energy converter is provided with additional dc converter having control input, converter control device, controlled switch, capacitor connected to dc leads of valve-type converter, and induction-machine stator voltage sensor whose output is connected to input of automatic-control unit; additional dc converter is connected between storage battery leads and valve-type dc converter leads; sensor leads with controlled member inserted in-between are connected through controlled switch. EFFECT: enlarged operating speed range of machine when running as generator. 2 cl, 2 dwg

Description

 The invention relates to electrical engineering, in particular to electric machines with semiconductor (valve) power converters, and can be used in stand-alone objects, in particular automobiles, to generate electrical energy and start the drive motor.
 Known electrical systems with starter generators based on electrical machines of alternating current / 1, 2 /.
 Also known is an electrical system with an asynchronous starter-generator and a valve converter in the stator circuit of an asynchronous machine, connected to the shaft of the drive motor / 3 /. This system contains a battery in a direct current circuit connected directly to the terminals of the same polarity of the valve converter. The shaft of the asynchronous machine is connected to the shaft of the drive motor through a gearbox. The control terminals of the semiconductor elements of the valve converter are connected to the outputs of the output stage unit of the control device, the inputs of which are connected to the outputs of a three-phase pulse generator, the input of which is connected to the main frequency output of the valve converter automatic control unit, which contains a microprocessor device for regulating the frequency and amplitude of the stator voltage of the induction machine in starter and generator modes. The system’s DC consumers are connected to the battery tires through a DC / DC converter, which stabilizes the voltage of these consumers.
The considered system makes it possible to carry out an effective controlled start of the drive motor from the storage battery and generate electricity to charge the storage batteries and supply the DC consumers with stabilized voltage in the generator mode. The disadvantage of this system is a decrease in the overload capacity of an asynchronous machine when operating with a limitation of the level of the amplitude of the stator voltage at higher frequencies and, as a result, a limitation from above of the operating frequency range of the rotation of the drive motor in the generator mode (4000 - 4500 min -1 ).
 The essence of the alleged invention lies in the fact that, in order to eliminate this drawback, in an electrical system with an asynchronous starter-generator, including an asynchronous machine, the terminals of the three-phase stator winding of which are connected to the phase terminals of a three-phase valve converter of the type of an autonomous voltage inverter, the control inputs of the semiconductor elements of the valve the converter is connected to the outputs of the output stages, the inputs of which are connected to the outputs of a three-phase pulse generator, the input of which о is connected to the main frequency output of the automatic control unit of the valve converter, the shaft of the asynchronous machine is connected to the shaft of the internal combustion engine, and two DC terminals of the valve converter are connected to unipolar battery terminals to which the terminals of the DC consumers are connected, and this system is also equipped with an additional DC / DC converter with a control input, a control device for this converter, controlled by a key, a capacitor, connected to the DC terminals of the valve converter, and the voltage sensor of the stator of the asynchronous machine, the output of which is connected to the input of the automatic control unit, the additional DC converter being connected between the battery terminals and the DC terminals of the valve converter, and its unipolar terminals between which the valve the controlled element and the throttle connected in series with it are connected by a controlled key, the control input of which is connected to DC odes of the valve converter through a threshold element, said control device comprising a control pulse generator, the output of which is connected to a control input of an additional DC converter, having a pulse width control input and a synchronization input, a battery current sensor and a battery current adjuster, a comparison element and a regulator current, while the output of the battery current sensor is connected to the inverting input of the comparison element, and to its other input li ne setpoint output battery current comparison output member through current regulator connected to the inlet width adjustment pulse shaper control pulses and the clock input of said generator connected to the output of the fundamental frequency automatically controlled converter control unit.
 In addition, the present invention aims to reduce the volumetric performance of an additional DC-DC converter, which is achieved by the fact that the said control device is equipped with a controlled frequency multiplier with main and control inputs, as well as an analog-to-digital converter, the output of a controlled frequency multiplier connected to the synchronization input of the shaper control pulses, the control input of the multiplier is connected to the output of the voltage sensor of the asynchronous machine through analog-digital the converter, and the main input - with the output of the main frequency of the automatic control unit of the valve converter.
 A positive effect is achieved by the fact that the system is equipped with an additional DC / DC converter with a control input, a control device for this converter, controlled by a key, a capacitor connected to the DC terminals of the valve converter, and a stator voltage sensor of an asynchronous machine, the output of which is connected to the input of the automatic control unit, moreover, an additional DC-DC converter is connected between the battery terminals and the valve DC terminals of the converter, and its unipolar terminals, between which the valve controlled element is connected and the inductor connected in series with it, are connected by a controlled key, the control input of which is connected to the DC terminals of the valve converter via a threshold element, said control device including a control pulse generator, the output of which connected to the control input of an additional DC / DC converter, having a pulse width control input and a sync input a battery current sensor, the input of which is connected in series to the battery circuit, and a battery current regulator, a comparison element and a current regulator, while the output of the battery current sensor is connected to the inverting input of the comparison element, and the output of the battery current regulator is connected to its other input, output the comparison element through the current regulator is connected to the pulse width control input of the control pulse shaper, and the synchronization input of the shaper is connected to the main frequency output automatic control unit of the valve converter, as well as the fact that the said control device is equipped with a controlled frequency multiplier with the main and control inputs, as well as an analog-to-digital converter, the output of the controlled frequency multiplier being connected to the synchronization input of the control pulse generator, the control input of the multiplier connected to the output voltage sensor of an asynchronous machine through an analog-to-digital converter, and the main input - with the output of the main frequency of the automatic block control valve converter.
 As an example of a specific implementation of the system, a system with an automobile asynchronous starter-generator and a transistor frequency converter is given.
 In FIG. 1 shows a block diagram of a device.
 In FIG. 2 illustrates the implementation of a valve converter and connecting a power source of electronic circuits.
 In FIG. 1 asynchronous machine 1 is connected via a reducer 2 to an internal combustion engine (ICE) 3. The phases of the stator of the asynchronous machine are connected to the AC terminals A, B, C of the valve converter (VP) 4, the DC terminals 5, 6 of which are connected to the unipolar battery terminals batteries 7. The vehicle electrical system (BS) 8 of the vehicle is connected to the battery terminals. It can be connected via a DC / DC converter, as in / 3 /. The DC terminals of the valve converter 4 are connected to the battery terminals through an additional DC converter 9, including an inductive element (inductor) 10, a transistor (valve controlled element) 11 and a reverse diode 12. A circuit with a reactor and a transistor is bridged by a normally-closed key 13, whose input through the threshold element 14 is connected to the conclusions 5, 6 VP. The frequency and amplitude of the AC voltage of the valve converter is regulated by the automatic control unit 15, the main frequency output 16 of which is connected to the input of the valve converter 4. A voltage sensor 17 is connected to terminals A, B, C, the output of which is connected to the input of the automatic control unit 15. To the control the input of the DC / DC converter 9 is connected to the output of the control device 18.
 The device 18 contains a current sensor 19 in the battery circuit, a comparison element 20, a current controller 21, a current regulator 22, a pulse shaper 23 with a pulse width adjustment input 24 and a synchronization input 25, a frequency multiplier 26 with a control input 27 and an analog-to-digital converter 28 .
 In this case, the output of the current sensor 19 is connected to the inverting input of the comparison device 20, to the non-inverting input of which the battery charging current setter 21 is connected. The output of the comparison device is connected to the input of the current regulator 22, which can be performed on an electronic amplifier. The output of the current regulator 22 is connected to the input of the pulse width control 24 of the pulse shaper 23, to the synchronization input 25 of which, through the frequency multiplier 26, the output 16 of the ACU is connected. The control input 27 of the frequency multiplier 26 through an analog-to-digital Converter 28 is connected to the output of the voltage sensor 17.
 In FIG. 2 shows a valve converter 4 made according to a three-phase bridge autonomous voltage inverter. Each of the shoulders of the bridge contains a transistor and a reverse diode. A capacitor 29 is connected to the terminals 5, 6 of this converter. VP 4 transistors are controlled by output stages 30, to the inputs of which a three-phase pulse generator 31 is connected, to the input of which an output 16 of the main frequency of the automatic control unit 15 is connected. To buses 5, 6 of the valve converter 4, through the key 32 is connected to a power source 33, the outputs of which are connected to power buses of electronic circuits of the described electrical system. The key 32 can be made as the ignition key of the car.
 The electrical system with a car asynchronous starter-generator operates as follows.
 When you turn on the key 32, the power source 33 and the electronic control circuits of the electrical system begin to work. The automatic control unit 15 makes an adjustable frequency start of the asynchronous machine 1 from the battery of accumulators 7 through a valve converter 4 (for example, as in / 2 /). The controlled key 13 in the starter mode is closed and the DC / DC converter 9 does not work. After accelerating the internal combustion engine 3 to the rated speed, it enters into operation and starts to rotate the shaft of the asynchronous machine 1 with a rotation speed greater than the synchronous one. The system goes into generator mode. At the same time, at low engine speeds 3, the block 15 stabilizes the voltage of the battery 7. After accelerating the internal combustion engine 3 to speeds much higher than the nominal speed, the block 15 adjusts the main frequency at the output 16 so that when the speed of the shaft of the machine 1 increases, the voltage amplitude the stator of this machine increased, for example, as described in / 1 /. This increases the voltage at the terminals 5, 6, triggers the threshold element 14 (it can be made in the form of a relay coil, and 13 in the form of a normally closed contact of this relay) and the controlled key 13 opens. DC / DC converter 9 starts to work.
 Converter 9 operates as follows. When the voltage at the terminals 5 and 6 increases, the battery charge current increases, the signal from the current sensor 19 increases, which reduces the signals at the outputs of the comparison element 20 and the current regulator 22, which reduces the signal at the input 24 of the pulse shaper 23 and reduces the duration of the pulses generated by this shaper, which leads to a decrease in the open time of the transistor 11 and a decrease in the charging current of the batteries. Thus, the charging current of the batteries is limited. The inductive element 10 of the Converter 9 is used to smooth the charging current, and the diode 12 for closing the current of the inductive element 10 when the transistor 11 is turned off.
 To eliminate the self-oscillations that may occur in the control system at a constant frequency of operation of the pulse shaper 23, its synchronization input 25 is connected to the output of the main frequency 16 of the BAU 15. In this case, the switching frequency of the transistor 11 is a multiple of the output frequency 15 and no self-oscillations occur.
 But with a constant multiplicity of the operating frequency of FI 23, the main frequency of BAU 15, the switching frequency of the transistor 9 is proportional to the range of operating frequencies of the internal combustion engine in which the converter 9 operates, and the mass-volume indicators of the DC-to-DC converter 9 are large with a significant range of variation of the indicated operating frequencies due to an increase in the inductor inductance selected at the minimum frequency, and increase the mass and volume of the cooler of the transistor 9, selected at the maximum frequency.
 To reduce the volumetric parameters of the DC-DC converter 9 between the output 15 of the BAU and the input 25 of the pulse shaper 23, a controlled frequency multiplier is included, to the control input of which the output signal of the voltage sensor 17 is transmitted, which is converted by an analog-to-digital converter 28 into digital form. When increasing the signal from the voltage sensor 17, the frequency multiplier of the frequency multiplier 26 decreases so that when the main frequency of the output 16 increases, the pulse frequency at the synchronizing input 25 of the pulse shapers changes within small limits, which allows to reduce losses in the transistor 11 at the maximum engine speeds 3 and increase the switching frequency of the transistor 11 at the lower engine speeds, at which the converter 9 operates. The latter allows to reduce the mass and volume of the inductive element 10.
 Shown in FIG. 2, a capacitor 29 is required to close the reactive currents through the bridge circuit of the valve converter during operation of the DC / DC converter 9.
 Thus, the proposed electrical system with an asynchronous starter-generator allows an efficient, adjustable frequency start-up of the asynchronous machine when the engine is started, and also provides significant charging currents of the batteries and power consumers with good quality direct current electricity in the generator mode in a wide range of variation of the engine speed with limited weight and volume of the optional DC / DC converter.
Used sources
1. Auth. testimonial. N 1669075 (USSR), H 02 P 9/4.
 2. Patent on the application N 95107184/07, cl. H 02 P 9/14, extradition decision 16.12.96.
 3. US patent N 4883973, CL. 290/31, 290/22.

Claims (2)

 1. An electrical system with an asynchronous starter-generator, including an asynchronous machine, the terminals of the three-phase stator winding of which are connected to the terminals of the three-phase valve converter, such as an autonomous voltage inverter, the control inputs of the semiconductor elements of which are connected to the outputs of the output stages, the inputs of which are connected to the outputs of the three-phase pulse generator, the input of which is connected to the output of the main frequency of the automatic control unit of the valve converter, the shaft being asynchronously the machine is connected to the shaft of the internal combustion engine, and two DC outputs of the valve converter are connected to unipolar battery terminals to which DC busbars are connected, characterized in that the system is equipped with an additional DC converter with a control input, a control device for this converter, a capacitor connected to the DC terminals of the valve converter, the voltage sensor of the stator of an asynchronous machine, the output of which is connected with the input of the automatic control unit of the valve converter, the additional DC converter connected between the battery terminals and the DC terminals of the valve converter, and a controlled key that is closed in the starter mode and the additional DC converter does not work, the control input of which is connected to the DC terminals a valve converter through a threshold element, said control device including a driver and control pulses having a pulse width control input and a synchronization input, a battery current sensor and a battery current adjuster, a comparison element and a current regulator, while the output of the battery current sensor is connected to the inverting input of the comparison element, and the output of the battery current adjuster is connected to its non-inverting input, the output of the comparison element through the current regulator is connected to the input of the pulse width control of the control pulse shaper, and the synchronization input of the said shaper is connected to the output of the main frequency of the automatic control unit of the valve converter.
 2. An electric system with an asynchronous starter-generator according to claim 1, characterized in that said control device is provided with a controlled frequency multiplier with main and control inputs and an analog-to-digital converter, the synchronization input of the control pulse generator being connected to the main frequency output of the automatic control unit through a frequency multiplier, the control input of which is connected to the output of the voltage sensor of the asynchronous machine through an analog-to-digital converter.
RU97121766/09A 1997-12-15 1997-12-15 Power system with induction starter-generator RU2173020C2 (en)

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RU97121766/09A RU2173020C2 (en) 1997-12-15 1997-12-15 Power system with induction starter-generator

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RU97121766/09A RU2173020C2 (en) 1997-12-15 1997-12-15 Power system with induction starter-generator

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RU2173020C2 true RU2173020C2 (en) 2001-08-27

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2453034C2 (en) * 2010-07-20 2012-06-10 Государственное образовательное учреждение высшего профессионального образования Самарский государственный технический университет Control device of asynchronous starter-generator
RU2460204C1 (en) * 2011-04-21 2012-08-27 Открытое Акционерное Общество "Агрегатное Конструкторское Бюро "Якорь" Autonomous starter-generator power supply system
RU196124U1 (en) * 2019-11-21 2020-02-18 Общество с ограниченной ответственностью НАУЧНО- ПРОИЗВОДСТВЕННОЕ ОБЪЕДИНЕНИЕ "ШТОРМ" STARTER-GENERATOR INSTALLATION OF A GAS-TURBINE ENGINE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2453034C2 (en) * 2010-07-20 2012-06-10 Государственное образовательное учреждение высшего профессионального образования Самарский государственный технический университет Control device of asynchronous starter-generator
RU2460204C1 (en) * 2011-04-21 2012-08-27 Открытое Акционерное Общество "Агрегатное Конструкторское Бюро "Якорь" Autonomous starter-generator power supply system
RU196124U1 (en) * 2019-11-21 2020-02-18 Общество с ограниченной ответственностью НАУЧНО- ПРОИЗВОДСТВЕННОЕ ОБЪЕДИНЕНИЕ "ШТОРМ" STARTER-GENERATOR INSTALLATION OF A GAS-TURBINE ENGINE

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MM4A The patent is invalid due to non-payment of fees

Effective date: 20041216

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MM4A The patent is invalid due to non-payment of fees

Effective date: 20061216