JPH0241691A - Starter for rotary electric machine and starting method therefor - Google Patents

Abstract

PURPOSE:To enable thyristor starting of a rotary electric machine by connecting an oscillator which can output a voltage having a desired frequency to a controller at the time of starting, and connecting a slip phase detector for detecting a slip phase frequency to the controller after the start is completed. CONSTITUTION:A changeover switch 13a and a circuit breaker 10 are opened and a changeover switch 13b and a circuit breaker 11 are closed at the time of start. Thus, a thyristor converter 7 is connected to the primary side of an AC-excited synchronous generating motor 1. A controller 4 controls a cycloconverter 3 connected to the secondary side of a generating motor in response to a voltage having a desired frequency to be output from an exciting pattern generator 14. When the start is completed to approach a synchronizing speed, the switch 13b is opened, the switch 13a is closed to supply the output of a slip phase detector 6 to the controller. The breaker 11 is opened, and the breaker 10 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starting device for a rotating electric machine and a starting method thereof.

[Conventional technology]

Conventionally, the starting method for synchronous motors was July 1, 1971.
Electric Cooperative Research No. 30 published by Electric Cooperative Research Association
The thyristor starting method described in Volume 1, No. 1, Pages 14 to 1-6 is well known as a pumped-storage starting method for a pumped-storage power plant-oriented fire-capacity synchronous generator motor.

Further, a variable speed pumped storage power generation system using an AC excited synchronous power generator is described in Japanese Patent Application Laid-Open No. 170300/1983.

That is, FIG. 5 shows a conventional example of a starting device for a variable speed pumped storage power generation system using the same alternating current excited synchronous generator motor. As shown in the figure, the variable speed pumped storage power generation system consists of an AC-excited synchronous generator motor, a pump water turbine, two pump turbines, and two pump turbines. An excitation device, such as a cycloconverter 3. A control device 4° that controls the pump-turbine governor 2a and the gate of the cycloconverter 3 based on information such as active power command, head or head, system voltage, rotational speed, and slip phase so that the system is in an optimal operating state. A device for detecting a slip phase frequency that detects the difference between the voltage frequency of the power system 5 and the rotation frequency determined by the product of the magnetic pole logarithm and the rotation speed of the AC-excited synchronous generator 1; for example, it is composed of a slip phase detector 6. .

In addition, a starting power source, for example, a thyristor starting device, is a thyristor converter 7. Distributor 8 for detecting the position of the magnetic pole of AC excited synchronous generator motor 1. It consists of a starting control device 9 that performs gate control of the thyristor converter 7 based on the ignition signals from the disc 1 to the reviewer 8 or the terminal voltage of the AC-excited synchronous generator 1.

In the figure, 10 is a first circuit breaker, 11 is a second circuit breaker, and 12 is a speed detector.

[Problem to be solved by the invention]

When starting with the above device, it is necessary to excite in a stopped state, but since the slip phase detector is in a stopped state, the slip is 1.0, and the frequency is the same as the voltage frequency of the power system (50 or 60t(z) is output.

The control device performs gate control of the cycloconverter so that the excitation current flows at the same frequency as the slip frequency detected by the slip phase detector, so the rotor winding of the AC-excited synchronous generator motor has the same voltage frequency as the power system voltage frequency. A current of the frequency flows. Since the AC-excited synchronous generator motor is stopped, a voltage with the same frequency as the voltage frequency of the power grid is induced in the stator winding. In this state, the thyristor converter and the AC-excited synchronous generator motor, which are about to be started by the low frequency, cannot be synchronized and cannot be started.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a starting device for a rotating electrical machine that enables thyristor starting, and a starting method thereof.

[Means to solve the problem]

The above object is to provide a first changeover switch between a control device and a device for detecting a slip phase frequency, and to connect a second changeover switch between the first changeover switch and the control device in parallel with the changeover switch. This is achieved by providing an oscillator that can output a voltage at a desired frequency. A first change-over switch is provided between the control device and the device for detecting the slip phase frequency, and a second change-over switch is connected between the first change-over switch and the control device in parallel to the desired change-over switch. An oscillator capable of outputting a voltage at a certain frequency is provided, and when the rotating electric machine starts, the first changeover switch and the first circuit breaker are opened, the second changeover switch and the second circuit breaker are closed, and the oscillator generates direct current. This is achieved by generating voltage and starting the rotating electric machine with the starting power source.

[Effect]

A first changeover switch is provided between the control device and the device that detects the Veri phase frequency, and a desired changeover switch is provided between the first changeover switch and the control device via a second changeover switch in parallel with the first changeover switch and the control device. Since an oscillator capable of outputting a voltage at a certain frequency is provided, it is now possible to excite an AC-excited synchronous generator motor with a voltage (DC voltage) at a desired frequency generated by the oscillator, thereby generating an AC-excited synchronous generator. The motor can now be started by a thyristor converter like a normal AC excited synchronous generator motor, and a starting device capable of thyristor starting is obtained. Then, at the start of startup, the first changeover switch and the first circuit breaker are opened, the second changeover switch and the second circuit breaker are closed, the oscillator generates DC voltage, and the thyristor converter generates AC excitation synchronous power generation. Now that we have started the AC-excited synchronous generator-generator, the AC-excited synchronous generator-generator is excited with DC voltage and can be started with the Cyrisk converter.
A starting method is obtained that allows thyristor starting.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. FIG. 1 shows an embodiment of the invention. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, a first changeover switch 13a is provided between the control device 4 and the slip phase detector 6, and a second changeover switch is provided between the first changeover switch 13a and the control device 4 in parallel therewith. An oscillator, for example an excitation pattern generator 14, capable of outputting a voltage of a desired frequency via the oscillator 13b was provided.

When starting the AC-excited synchronous generator 1, the first
The changeover switch 13a and the first circuit breaker 10 are opened, the second changeover switch 13b and the second circuit breaker 11 are closed, the excitation pattern generator 14 generates DC voltage, and the thyristor converter 7 starts the operation. I tried to let him do it. By doing so, the AC-excited synchronous generator-motor 1 is excited with a DC voltage and can be started by the thyristor converter 7, thereby obtaining a starting device for a rotating electrical machine and a method for starting the rotating electric machine that can perform thyristor starting. Can be done.

That is, the first
A changeover switch 1.3 a is provided, and this changeover switch 1.
An excitation pattern generator 14 capable of outputting a voltage of a desired frequency was provided on the control device 4 side of 3a via a second changeover switch 13b.

At the start of startup, the first changeover switch 1.3a and the first circuit breaker 10 are opened, and the second changeover switch 13b and the second circuit breaker 11 are closed. Excitation pattern generator 1
By generating a DC voltage at step 4, the control device 4 performs gate control of the cycloconverter 3 so that a DC current flows. Therefore, the AC-excited synchronous generator machine 1 is excited by the DC current, and the normal synchronous generator 1 is excited by the DC current. As with the generator motor, the thyristor converter 7 enables thyristor starting. In this way, the starting control device 9 that performs gate control of the thyristor converter 7 starts the AC-excited synchronous generator-generator 1 using the same control as the thyristor-starting control of the synchronous generator-generator.
It becomes possible to start the thyristor.

After completion of this start, the engine shifts to normal operation, and FIG. 2 shows the procedure for closing and releasing the changeover switch and circuit breaker when shifting to normal operation.

This procedure will be explained with reference to FIG. In the state shown in FIG. 1, acceleration is performed in a state of DC excitation based on the DC signal of the excitation pattern generator 14, and as the synchronous speed approaches, the Veri phase frequency also decreases, and the output of the Veri phase detector 6 reaches the synchronous speed. is also a direct current.

In this state, the first changeover switch 13a is turned on and the second changeover switch 13b is released. At this time, the output of the excitation pattern generator 14 and the output of the slip phase detector 6 are DC, and when viewed from the control device 4, there is no change in the input signal. 6
Switching can be done smoothly. Thereafter, the output of the thyristor converter 7 is stopped, the second circuit breaker 11 is released, and the first circuit breaker 10 is closed to join the power system 5, and normal pumping operation is performed. This state during normal operation is shown in FIG. As shown in the figure, in normal operation, the first changeover switch 13a and the first circuit breaker 10 are closed, and the second changeover switch 13) 1 and the second circuit breaker 11 are opened. . By doing so, even if the output of the thyristor converter 7 is stopped and the AC-excited synchronous generator 1 is decelerated to a rotation speed lower than the synchronous speed while being connected to the power system 5, the Since it is excited by the output of the detector 6, the stator voltage of the AC-excited synchronous generator 1 always matches the voltage frequency of the power system 5, and synchronous connection is possible.

In this way, according to this embodiment, DC excitation is performed at the initial stage of startup, so thyristor starting control can be performed in the same way as the starting of a normal synchronous generator-motor, and excitation control based on the slip phase is performed at the time of synchronization. Therefore, it is possible to reliably perform synchronous addition.

FIG. 4 shows a change in frequency 9 rotational speed over time when the output frequency of the excitation pattern is changed during startup in another embodiment of the present invention. As shown in the figure, at the initial stage of startup, the output of the excitation pattern generator is DC;
Continuously change the current from DC to]■-5I-Iz during startup. At this time, the frequency of the stator voltage of the AC-excited synchronous generator motor also becomes a frequency 5 Hz higher than the rotation frequency. Accelerate in this state,
When the frequency of the stator voltage matches the voltage frequency of the power system, synchronous joining becomes possible based on the procedure shown in FIG. 2 described above. At this time, the actual rotational speed may be lower than the synchronous speed by S HZ, so when the rotational speed is accelerated to the synchronous speed, the power grid will change in a short time as shown by the solid line, compared to the state shown by the broken line in the figure. You will be able to synchronously join. In other words, it is possible to shorten the time until synchronous joining compared to the case described above.

In the above embodiment, the stator winding of the AC excited synchronous generator motor is connected to the thyristor converter for starting, the two-rotor winding is connected to the cycloconverter for excitation, but the stator winding is connected to the cycloconverter for excitation. The same effect can be obtained by connecting a thyristor converter for starting to the rotor winding.

In addition, in the following two examples, a thyristor converter was used as a power source for starting, but this has a controllable output frequency.
Any power supply device may be used as long as it has a capacity necessary and sufficient for starting. A typical example is a transistor inverter, GTO
Examples include inverters and synchronous generators.

Furthermore, in the above embodiment, an example was described in which a slip phase detector that detects slippage by mechanical rotation is employed.
This may be a slip phase detector that derives the slip signal through analog or digital processing.

〔Effect of the invention〕

As mentioned above, the present invention enables thyristor starting,
A starting device for a rotating electrical machine that enables thyristor starting and a starting method thereof can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the starting state of an embodiment of the starting device for a rotating electric machine according to the present invention, FIG. 2 is a block diagram of the same embodiment at the time of synchronous combination, and FIG. An explanatory diagram showing the state during normal operation of the embodiment, FIG. 4 is a frequency 2 when the output frequency of the excitation pattern generator of another embodiment of the starting device for a rotating electric machine of the present invention is changed during starting.
A characteristic diagram showing the relationship between rotational speed and time, and FIG. 5 is an explanatory diagram showing a conventional starting device for a rotating electric machine. 1...AC excitation synchronous generator motor (rotating electric machine), 3 cycloconverter (market conditions for excitation), 4...control device,
5 - Power system, 6... Slip phase detector (device that detects the slip phase frequency), 7... Thyristor converter (power source for starting), 10... First circuit breaker, 11 -
Second circuit breaker, 13a...first changeover switch, 13
b...Second changeover switch, 14 - Excitation pattern generator (oscillator).

Claims (1)

[Claims] 1. Connected to the stator winding of a rotating electrical machine that has multiphase windings on the stator and rotor and is connected to the power system via a first circuit breaker, a power source for starting that is controllable, a power source for excitation of the rotating electrical machine that is connected to the rotor winding of the rotating electrical machine and whose output frequency can be controlled, and between the rotor winding and the power system. The starting power source includes a device connected to the power system and detecting a slip phase frequency corresponding to a difference between the frequency of the electric power system and a rotation frequency determined by the product of the number of pole pairs and the rotation speed of the rotating electric machine, The device is connected in parallel to the first circuit breaker via a second circuit breaker, and is connected between the excitation power source and the slip phase frequency detecting device to control the output frequency of the excitation power source. In the starting device of a rotating electrical machine equipped with a control device,
A first change-over switch is provided between the control device and the device for detecting the slip phase frequency, and a second change-over switch is provided between the first change-over switch and the control device in parallel with the above-mentioned change-over switch. 1. A starting device for a rotating electrical machine, characterized by comprising an oscillator capable of outputting a voltage at a frequency of . 2. The starting device for a rotating electrical machine according to claim 1, wherein the starting power source is a thyristor converter, a transistor inverter, a GTO inverter, or a synchronous generator. 3. The starting device for a rotating electrical machine according to claim 1, wherein the excitation power source is a cycloconverter. 4. The starting device for a rotating electric machine according to claim 1, wherein the device for detecting the slip phase frequency is a slip phase detector. 5. The starting device for a rotating electric machine according to claim 1, wherein the oscillator is an excitation pattern generator. 6. For starting, which has multiphase windings on the stator and rotor and is connected to the stator winding of a rotating electric machine connected to the power system via the first circuit breaker, and whose output frequency can be controlled. a power source for excitation of the rotating electrical machine which is connected to the rotor winding of the rotating electrical machine and whose output frequency can be controlled; and a power source which is connected between the rotor winding and the power system and which is connected to the power system and a device for detecting a slip phase frequency corresponding to the difference between the frequency of
A control device is connected in parallel to the circuit breaker via a second circuit breaker, and between the excitation power source and the device for detecting the slip phase frequency is a control device that controls the output frequency of the excitation power source. A first changeover switch is provided between the control device and the device for detecting the slip phase frequency, and a second changeover switch is provided between the first changeover switch and the control device in parallel therewith. An oscillator capable of outputting a voltage of a desired frequency via a changeover switch is provided, and when starting the rotating electric machine, the first changeover switch and the first
the second changeover switch and the second
close the circuit breaker and generate a DC voltage in the oscillator,
A method for starting a rotating electrical machine, characterized in that the rotating electrical machine is started using the starting power source.