CN111835018B - Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method - Google Patents

Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method Download PDF

Info

Publication number
CN111835018B
CN111835018B CN202010368304.9A CN202010368304A CN111835018B CN 111835018 B CN111835018 B CN 111835018B CN 202010368304 A CN202010368304 A CN 202010368304A CN 111835018 B CN111835018 B CN 111835018B
Authority
CN
China
Prior art keywords
phase modulator
synchronous phase
cond
sync
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010368304.9A
Other languages
Chinese (zh)
Other versions
CN111835018A (en
Inventor
袁涛
牟清文
刘兴
王谱宇
郭玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing University of Science and Technology
Original Assignee
Nanjing University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing University of Science and Technology filed Critical Nanjing University of Science and Technology
Priority to CN202010368304.9A priority Critical patent/CN111835018B/en
Publication of CN111835018A publication Critical patent/CN111835018A/en
Application granted granted Critical
Publication of CN111835018B publication Critical patent/CN111835018B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • 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
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
    • 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
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/20—Arrangements for starting
    • 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
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/01—Asynchronous machines
    • 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
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses a synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and a control method thereof. The method adopts a sectional control method to optimize a voltage rising curve of the synchronous phase modulator in a grid-connected speed falling stage, eliminates voltage impact, reduces excitation surge, and realizes smooth starting and grid connection of the synchronous phase modulator. The control method has lower complexity and easy implementation, and is also suitable for starting control of the synchronous motor and the asynchronous motor.

Description

Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method
Technical Field
The invention relates to a synchronous phase modulator starting control technology, in particular to a synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and a control method.
Background
Synchronous phase modulators are a common reactive power compensation device. As a rotating motor, after being connected, the synchronous phase modulator can increase the inertia of a power system, so that the synchronous phase modulator is widely applied to the field of high-voltage direct-current transmission. However, the operation and maintenance of the synchronous phase modulator are more complicated than those of static reactive compensation equipment, larger excitation inrush current and impact voltage are likely to occur in the starting grid-connection process, and if the starting control mode is improper, impact is caused to a power grid. Therefore, it is significant to design a proper starting grid-connected circuit and an effective time sequence grid-connected control method for the synchronous phase modulator.
Aiming at the starting grid-connected control problem of a synchronous phase modulator, the prior scheme mainly has the following problems: 1) the voltage set value of the excitation system is always kept at a rated value or changes from zero to the rated value suddenly when a starting command is issued, and a specific calculation method of the voltage set value of the excitation system is not determined, so that obvious impact voltage and excitation surge current can be caused in the starting process; 2) at the closing moment of an alternating current breaker at the synchronous phase modulator end, obvious impact voltage and excitation inrush current can appear at a grid connection point; 3) there is no specific method of specifically limiting the grid-connection point surge voltage and the magnetizing inrush current.
Disclosure of Invention
The invention aims to provide a synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and a control method thereof, which reduce impulse voltage and excitation current generated in the starting process and realize smooth starting and grid connection of the synchronous phase modulator.
The technical solution for realizing the purpose of the invention is as follows: a synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control comprises a synchronous phase modulator, a machine end main alternating current circuit breaker, a machine end auxiliary alternating current circuit breaker, a three-phase alternating current transformer, a power grid, an excitation system and a static frequency converter, wherein an alternating current outlet end of the synchronous phase modulator is connected with the three-phase alternating current transformer, the other side of the three-phase alternating current transformer is connected with the machine end main alternating current circuit breaker, the other side of the machine end main alternating current circuit breaker is connected with an alternating current power grid, and the static frequency converter is connected with the machine end main alternating current circuit.
A control method for starting a grid-connected circuit of a synchronous phase modulator based on the time sequence hybrid excitation control comprises the following steps:
step 1, building a synchronous phase modulator to start a grid-connected circuit;
step 2, gating the selection switch to the position A, connecting an IEEE standard exciter as an excitation device, closing the terminal auxiliary alternating current circuit breaker, starting the static frequency converter, increasing the rotating speed of the synchronous phase modulator from zero to 105% of the rated rotating speed, and disconnecting the terminal auxiliary alternating current circuit breaker, wherein the synchronous phase modulator falls in speed;
and 3, gating the selection switch to the position B, connecting a PID (proportion integration differentiation) as an excitation device, applying excitation voltage to the rotor side of the synchronous phase modulator, and controlling the stator side voltage of the synchronous phase modulator from VSFCIs lifted to 1.1VSFC；
And 4, gating the selection switch to the position A, connecting an IEEE standard exciter as an excitation device, applying excitation voltage to the rotor side of the synchronous phase modulator, and enabling the stator side voltage of the synchronous phase modulator to be 1.1VSFCIs lifted to 0.9VSCrated；
And 5, gating the selection switch to the position B, connecting a PID (proportion integration differentiation) as an excitation device, applying excitation voltage to the rotor side of the synchronous phase modulator, and controlling the stator side voltage of the synchronous phase modulator from 0.9VSCratedIs lifted to VSCratedCompleting the voltage building process of the synchronization phase modulator at the synchronization speed falling stage;
and 6, when the voltage of the outlet end of the stator armature winding of the synchronous phase modulator reaches the line voltage, closing a main circuit breaker of the outlet end line of the synchronous phase modulator to realize the normal connection of the synchronous phase modulator and a power grid.
Compared with the prior art, the invention has the following remarkable advantages: 1) by adopting the sectional control method, the voltage rising curve of the synchronous phase modulator in the grid-connected speed falling stage can be optimized, the voltage impact is eliminated, the excitation inrush current is reduced, and the smooth starting and grid connection of the synchronous phase modulator are realized; 2) the control method has low complexity and easy implementation, and is also suitable for starting control of the synchronous motor and the asynchronous motor.
Drawings
Fig. 1 is a schematic circuit diagram of a synchronous phase modulator startup grid connection.
Fig. 2 is a schematic diagram of the sectional control of the excitation system of the synchronous phase modulator.
Fig. 3 is a schematic diagram of the closing of a main ac circuit breaker at the end of a synchronous phase modifier.
Fig. 4 is a schematic diagram of the closing of a synchronous phase modifier side ac circuit breaker.
Detailed Description
As shown in fig. 1, the synchronous phase modulator Sync _ Cond startup grid-connected circuit based on time sequence hybrid excitation control is characterized by comprising a synchronous phase modulator Sync _ Cond, a machine end main alternating current breaker CB _ G, a machine end auxiliary alternating current breaker CB _ SFC, a three-phase alternating current transformer TF, a power grid PS, an excitation system and a static frequency converter SFC, wherein the alternating current outlet end of the synchronous phase modulator Sync _ Cond is connected with the three-phase alternating current transformer TF, the other side of the three-phase alternating current transformer TF is connected with the machine end main alternating current breaker CB _ G, the other side of the machine end main alternating current breaker CB _ G is connected with the alternating current power grid PS, and the static frequency converter SFC is connected with the machine end main alternating current breaker CB _ G in parallel through the machine end auxiliary alternating current breaker CB _ SFC.
As shown in fig. 2, the method for controlling the start-up of the synchronous phase modulator based on the time-series hybrid excitation control is divided into three stages, namely, a voltage stabilization stage, a smooth voltage build-up stage and a voltage regulation stage, and specifically includes the following steps:
step 1, building a synchronous phase modulator starting grid-connected circuit, as shown in figure 1, the synchronous phase modulator basically comprises a stator, a rotor and an excitation part, wherein a signal of an excitation control system comprises an alternating voltage reference value VrefActual value V of AC voltageabcAnd the output electromotive force E of the excitation systemfFeedback of exciting current If. Excitation control system based on input VrefAnd VabcSignal, control output electromotive force Ef。
Step 2, gating the selection switch SE _ E to the position A, connecting an IEEE standard exciter as an excitation device, then closing a machine end secondary alternating current breaker as shown in figure 4, completing the connection of the SFC and the synchronous phase modulator, increasing the rotating speed of the synchronous phase modulator from zero to 105% of the rated rotating speed by the SFC, disconnecting the machine end secondary alternating current breaker, and reducing the speed of the synchronous phase modulator;
and 3, gating the selection switch to the position B, connecting a PID (proportion integration differentiation) as an excitation device, applying excitation voltage to the rotor side of the synchronous phase modulator, and controlling the stator side voltage of the synchronous phase modulator from VSFCIs lifted to 1.1VSFCThe stage is a voltage stabilization stage;
and 4, gating the selection switch to the position A, connecting an IEEE standard exciter as an excitation device, applying excitation voltage to the rotor side of the synchronous phase modulator, and enabling the stator side voltage of the synchronous phase modulator to be 1.1VSFCIs lifted to 0.9VSCratedThe stage is a smooth pressure building stage;
and 5, gating the selection switch to the position B, connecting a PID (proportion integration differentiation) as an excitation device, applying excitation voltage to the rotor side of the synchronous phase modulator, and controlling the stator side voltage of the synchronous phase modulator from 0.9VSCratedIs lifted to VSCratedThe phase is a voltage regulating phase, and the overall voltage building process of the synchronous phase modulator grid-connected speed reduction phase is completed;
and 6, when the voltage of the outlet end of the stator armature winding of the synchronous phase modulator reaches the line voltage, closing a main circuit breaker of the outlet end line of the synchronous phase modulator to realize the normal connection of the synchronous phase modulator and a power grid as shown in figure 3.
Further, step 3 sets the reference voltage of the excitation system according to the inverter voltage of the static frequency converter, and the formula is as follows:
VEref＝1.1VSFC
in the formula, VErefFor excitation system reference voltage, VSFCThe voltage is inverted by the static frequency converter.
Further, step 4 sets the reference voltage of the excitation system according to the rated voltage of the synchronous phase modulator, and the formula is as follows:
VEref＝0.9VSCrated
in the formula, VErefFor excitation system reference voltage, VSCratedThe voltage is rated for the stator side of the synchronous phase modulator.
Further, step 5 sets the reference voltage of the excitation system according to the rated voltage of the synchronous phase modulator, and the formula is as follows:
VEref＝VSCrated
in the formula, VErefFor excitation system reference voltage, VSCratedThe voltage is rated for the stator side of the synchronous phase modulator.

Claims (4)

1. The synchronous phase modulator (Sync _ Cond) starting grid-connected circuit based on time sequence hybrid excitation control is characterized by comprising a synchronous phase modulator (Sync _ Cond), a machine end main alternating current circuit breaker (CB _ G), a machine end auxiliary alternating current circuit breaker (CB _ SFC), a three-phase alternating current Transformer (TF), a power grid (PS), an excitation system and a Static Frequency Converter (SFC), wherein the alternating current outlet end of the synchronous phase modulator (Sync _ Cond) is connected with the three-phase alternating current Transformer (TF), the other side of the three-phase alternating current Transformer (TF) is connected with the machine end main alternating current circuit breaker (CB _ G), the other side of the machine end main alternating current circuit breaker (CB _ G) is connected with the alternating current power grid (PS), and the Static Frequency Converter (SFC) is connected with the alternating current outlet end of the synchronous phase modulator (Sync _ Cond) through the;
the control method for starting the grid-connected circuit by the synchronous phase modulator (Sync _ Cond) controlled by the time sequence hybrid excitation is characterized by comprising the following steps of:
step 1, building a synchronous phase modulator (Sync _ Cond) to start a grid-connected circuit;
step 2, connecting an IEEE standard exciter as an exciting device, closing a terminal side AC circuit breaker (CB _ SFC), starting a Static Frequency Converter (SFC), increasing the rotating speed of a synchronous phase modulator (Sync _ Cond) from zero to 105% of the rated rotating speed, disconnecting the terminal side AC circuit breaker (CB _ SFC) and reducing the speed of the synchronous phase modulator (Sync _ Cond);
step 3, connecting PID as an excitation device, applying excitation voltage to the rotor side of the synchronous phase modulator (Sync _ Cond), and converting the stator side voltage of the synchronous phase modulator (Sync _ Cond) from VSFCIs lifted to 1.1VSFCIn which V isSFCIs a Static Frequency Converter (SFC) inversion voltage;
step 4, connecting an IEEE standard exciter as an exciting device, applying exciting voltage to the rotor side of the synchronous phase modulator (Sync _ Cond), and enabling the stator side voltage of the synchronous phase modulator (Sync _ Cond) to be 1.1VSFCIs lifted to 0.9VSCratedIn which V isSCrated-rating the voltage for the stator side of the synchronous phase modulator (Sync _ Cond);
step 5, connecting PID as an excitation device, applying excitation voltage to the rotor side of the synchronous phase modulator (Sync _ Cond), and enabling the stator side voltage of the synchronous phase modulator (Sync _ Cond) to be 0.9VSCratedIs lifted to VSCratedCompleting the voltage building process of the synchronization phase modulator (Sync _ Cond) in the synchronization speed reduction stage;
and 6, when the voltage of the outlet end of the stator armature winding of the synchronous phase modulator (Sync _ Cond) reaches the line voltage, closing a main circuit breaker (CB _ G) of the outlet end line of the synchronous phase modulator (Sync _ Cond) to realize the normal connection of the synchronous phase modulator (Sync _ Cond) and the power grid (PS).
2. The synchronous phase modulator (Sync _ Cond) startup grid-connected circuit based on time series hybrid excitation control according to claim 1, wherein step 3 sets the excitation system reference voltage according to the Static Frequency Converter (SFC) inversion voltage, and the formula is:
VEref＝1.1VSFC
in the formula, VErefFor excitation system reference voltage, VSFCIs the inversion voltage of a Static Frequency Converter (SFC).
3. The synchronous phase modulator (Sync _ Cond) startup grid-connected circuit based on time series hybrid excitation control as claimed in claim 1, wherein step 4 sets the excitation system reference voltage according to the rated voltage of the synchronous phase modulator (Sync _ Cond), and the formula is as follows:
VEref＝0.9VSCrated
in the formula, VErefFor excitation system reference voltage, VSCratedThe voltage is rated for the stator side of the synchronous phase modulator (Sync _ Cond).
4. The synchronous phase modulator (Sync _ Cond) startup grid-connected circuit based on time-series hybrid excitation control as claimed in claim 1, wherein step 5 sets the excitation system reference voltage according to the rated voltage of the synchronous phase modulator (Sync _ Cond), and the formula is as follows:
VEref＝VSCrated
in the formula, VErefFor excitation system reference voltage, VSCratedThe voltage is rated for the stator side of the synchronous phase modulator (Sync _ Cond).
CN202010368304.9A 2020-04-30 2020-04-30 Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method Active CN111835018B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010368304.9A CN111835018B (en) 2020-04-30 2020-04-30 Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010368304.9A CN111835018B (en) 2020-04-30 2020-04-30 Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method

Publications (2)

Publication Number Publication Date
CN111835018A CN111835018A (en) 2020-10-27
CN111835018B true CN111835018B (en) 2021-09-10

Family

ID=72914008

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010368304.9A Active CN111835018B (en) 2020-04-30 2020-04-30 Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method

Country Status (1)

Country Link
CN (1) CN111835018B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112865129B (en) * 2021-04-08 2023-03-28 哈尔滨理工大学 Static phase modifier
CN115622118B (en) * 2022-09-27 2023-06-30 国网天津市电力公司 Direct grid-connected control method based on low-output-voltage static frequency converter phase adjustment machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107894542A (en) * 2017-10-20 2018-04-10 国电南瑞科技股份有限公司 The supporting secondary device test system of synchronous capacitor and method
CN109038684A (en) * 2018-08-15 2018-12-18 国电南瑞科技股份有限公司 A kind of large synchronous compensator group running down simultaneous interconnecting method
CN109387724A (en) * 2018-09-30 2019-02-26 南京理工大学 Based on the lateral modified synchronous capacitor method for diagnosing faults of vertical analysis
CN110311382A (en) * 2019-07-15 2019-10-08 南京师范大学 A kind of lazy speed point setting method improving the lazy grid-connected success rate of speed of synchronous capacitor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108880353A (en) * 2018-07-05 2018-11-23 国家电网有限公司 Large synchronous compensator method for starting-controlling based on voltage-source type static frequency changer
CN110635621A (en) * 2019-10-24 2019-12-31 中国能源建设集团广东省电力设计研究院有限公司 Method for changing retired generator into self-shunt excitation synchronous phase modulator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107894542A (en) * 2017-10-20 2018-04-10 国电南瑞科技股份有限公司 The supporting secondary device test system of synchronous capacitor and method
CN109038684A (en) * 2018-08-15 2018-12-18 国电南瑞科技股份有限公司 A kind of large synchronous compensator group running down simultaneous interconnecting method
CN109387724A (en) * 2018-09-30 2019-02-26 南京理工大学 Based on the lateral modified synchronous capacitor method for diagnosing faults of vertical analysis
CN110311382A (en) * 2019-07-15 2019-10-08 南京师范大学 A kind of lazy speed point setting method improving the lazy grid-connected success rate of speed of synchronous capacitor

Also Published As

Publication number Publication date
CN111835018A (en) 2020-10-27

Similar Documents

Publication Publication Date Title
EP1820259B1 (en) Staged motor starting and wye / delta switching
EP1553275B1 (en) A method and apparatus for starting a gas turbine using a polyphase electric power generator
CN111835018B (en) Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method
EP2715906A1 (en) System for distributing electric power to an electrical grid
CN107453404A (en) A kind of large-scale phase modifier starts combination method
US9461565B2 (en) Systems, apparatus, and methods for soft starting large AC motors with a variable frequency drive
US4481455A (en) Method of starting variable-speed induction motor
US10505488B2 (en) Systems and method for controlling electrodynamic machines with a variable frequency drive
CN109756157B (en) Method for inhibiting impact current in switching process of variable-frequency soft starter
CN100435469C (en) Method and arrangement in connection with slip-ring motor
Das et al. Characteristics and analysis of starting of large synchronous motors
US20190260299A1 (en) Operating circuit for coupling a synchronous machine with a voltage network and method for operating it
CN107612042B (en) Synchronous phase modulator starting grid-connected circuit based on pre-access large impedance and control method
CN105391348B (en) A kind of variable frequency soft start system and method for axial flow compressor
CA2760022C (en) Double speed single phase alternating current motor
JP6310552B2 (en) Electric motor drive system
RU2608185C2 (en) Device for adaptive control of smooth launch of high-voltage electric drives
CN215646645U (en) Aircraft starting generator
JPH0564554B2 (en)
CN113162496B (en) Topological structure and control method of aviation two-stage type high-voltage direct-current starting power generation system
RU2737958C1 (en) Device for starting powerful synchronous electric motors
JP7475048B2 (en) Method and apparatus for paralleling induction generators
EP4120553A1 (en) Synchronous machine device, variable speed pumped storage power generation apparatus, and operation method
US20220341434A1 (en) Controller and drive circuit for electric motors
JPS58186397A (en) Voltage controlling method for hysteresis motor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CB03 Change of inventor or designer information

Inventor after: Wang Puyu

Inventor after: Yuan Tao

Inventor after: Mou Qingwen

Inventor after: Liu Xing

Inventor after: Guo Ling

Inventor before: Yuan Tao

Inventor before: Mou Qingwen

Inventor before: Liu Xing

Inventor before: Wang Puyu

Inventor before: Guo Ling

CB03 Change of inventor or designer information