JPH05292796A - Method and device for controlling speed regulation of generator - Google Patents

Abstract

PURPOSE:To realize quick stoppage of generator in safety by comparing generator speed signals fed from a speed signal generator for speed relay and a speed signal generator for governor with each other and outputting a stop command or an alarm if the speed difference is higher than a predetermined level. CONSTITUTION:In a hydro-electric power station, output from a main machine, i.e., a generator 1, is paralleled in a system 3 or paralleled out therefrom through a parallel interrupter 2. The generator 1 is additionally provided with a speed signal generator 11 for governor and a speed signal generator 12 for speed relay, wherein output signals from the speed signal generators 11, 12 are fed to a controller 13 for the purpose of sequence control, speed regulation control, and secondary regulation control. When speed regulation control is performed, a speed regulation control section 14 compares generator speeds fed from the speed signal generators 11, 12 with each other to produce a speed difference and produces a stop command if the speed difference is higher than a predetermined value. This controller stops the generator 1 in safety even upon malfunction of the speed signal generator 11 for governor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control method and apparatus for a hydroelectric power plant, and in particular, speed signal disappeared due to failure of speed signal generator for speed governor or circuit disconnection or short circuit. The present invention relates to a speed control method and device for a hydroelectric power plant that can quickly and safely stop the main engine.

[0002]

2. Description of the Related Art Generally, in a hydroelectric power plant, when the speed detection method of the generator is a permanent magnet generator method, the permanent magnet generator is damaged during operation due to a failure of the permanent magnet generator or a disconnection or short circuit of the circuit. When there is no speed signal from, the undervoltage relay detects the voltage drop of this speed signal and issues a stop command.

FIG. 3 shows a structural example of a control device in a conventional speed control method. Reference numeral 1 is a generator, which is the main engine, and its output is connected in parallel to the system 3 via a parallel breaker 2.
Will be disconnected. The permanent magnet generator 4 is directly connected to the generator 1,
Generates a speed signal. Reference numeral 5 is a speed relay that detects the speed of the generator 1, and 6 is a tachometer that displays the speed of the generator 1. The output of the permanent magnet generator 4 is supplied as a power supply voltage to the governor control device 8 via the power supply transformer 7, and to the speed governor control device 8 via the speed detection transformer 9. Supplied as. An undervoltage relay 10 is connected to the output side of the power transformer 7.

Next, the operation sequence of the speed control device shown in FIG. 3 will be described. First, when the generator 1 is started by a water turbine (not shown) and the rotation speed thereof reaches 80% or more, the undervoltage relay 10 is restored, and the governor control device 8 is activated. This governor control device adjusts the rotation speed of the generator 1 to a specified value. Further, the generator 1 is paralleled to the system by the parallel breaker 2 and enters the operating state.

In this state, the permanent magnet generator 4 fails,
When a failure such as disconnection or short circuit occurs in the circuit, the speed signal from the permanent magnet generator 4 disappears. Therefore, the power supply voltage and speed signal of the governor control device 8 are lost, and control becomes impossible. Therefore, the undervoltage relay 10 detects a decrease in the power supply voltage of the speed governor control device 8 and outputs a stop signal.

[0006]

As described above, when the speed detecting method of the generator is the method using the permanent magnet generator 4, the permanent magnet generator 4 fails during operation or the circuit is disconnected. Even if a defect such as a short circuit occurs, the defect can be detected by the undervoltage relay 10 and the generator 1 can be stopped quickly and safely.

However, in the case where the speed detection method uses the speed signal generator, the power supply voltage of the governor control device 8 is supplied from the power supply device (not shown), so that the speed signal generator is used. Even if a failure occurs, or a defect such as a disconnection or a short circuit occurs in the circuit, the speed governor control device 8 is kept alive and the speed signal is not input. Therefore, the speed governor control device 8 tries to increase the speed, but since it is parallel to the system, the speed does not increase, the load increases, and the overload operation continues.

The present invention has been made to eliminate the above-mentioned inconvenience, and even when a speed signal generator of a generator uses a speed signal generator, it can be operated during operation as in the case of using a permanent magnet generator. Failure of speed signal generator or disconnection of circuit,
It is an object of the present invention to provide a control method and an apparatus thereof that can prevent an overload, stop a generator quickly and safely, or generate an alarm even if a malfunction such as a short circuit occurs.

[0009]

SUMMARY OF THE INVENTION The present invention is a control method for controlling the speed of a generator, wherein a generator speed signal from a speed relay speed signal generator and power generation from a speed governor speed signal generator. Compared with the machine speed signal, it is determined whether the speed deviation as this output is less than or equal to the speed deviation specified value, and when the speed deviation is greater than or equal to the speed deviation specified value, a stop command or alarm for the generator is issued. Method for controlling speed of generator to be output, comparing unit for comparing generator speed signal from speed relay speed signal generator and generator speed signal from speed governor speed signal generator, and this comparing unit Power generation including a determination unit that determines whether or not the speed deviation that is the output of is less than or equal to the speed deviation specified value, and outputs a stop command or an alarm for the generator when the speed deviation is greater than or equal to the speed deviation specified value. This is the speed control device for the machine.

[0010]

In the method and apparatus of the present invention configured as described above, when the generator is in operation, the speed signal is generated due to a failure of the speed signal generator for governor, or a circuit disconnection or short circuit. Even if it disappears, overload operation can be prevented, and the generator can be stopped quickly and safely, or an alarm can be used to know the occurrence of an abnormality.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. In FIG. 1, the same parts as those in FIG. 3 and the corresponding parts are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, 11 is a speed signal generator for speed governor, 12 is a speed signal generator for speed relay, and 13 is a controller for performing sequence control, speed control and secondary adjustment control. There is. The control device 13 includes a speed control unit 14.

FIG. 2 shows a concrete example of the configuration of the speed control unit 14. The speed control unit 14 includes a comparison unit 15 and a determination unit 16.
It consists of In this speed control unit 14,
Generator speed S11 from the speed governor speed signal generator 11,
Generator speed S12 from the speed relay speed signal generator 12
And the speed deviation S15 are calculated by comparing with the comparison unit 15.
The speed deviation S15 is guided to the determination unit 16 together with the speed deviation specified value S17, and it is judged whether or not the speed deviation specified value S17 is less than or equal to the speed deviation specified value S17. The determination unit 16 determines that the speed deviation S15 is the speed deviation specified value S
If it is greater than 17, the stop command S14 is output.

In the control device configured as described above,
When the generator 1 is started by a water turbine (not shown), the speed signal generator 11 for speed governor generates a generator speed S11 which is a speed signal for speed governor, and the speed signal generator 1 for speed relay 1
From 2, a generator speed S12, which is a speed relay speed signal, is generated.

The comparing section 15 compares the generator speed S11 and the generator speed S12 to calculate the speed deviation S15, and the judging section 16 judges whether the speed deviation S15 is equal to or less than the speed deviation prescribed value S17. If the speed deviation S15 is less than or equal to the speed deviation specified value S17, the determination unit 16 does not operate, but if the speed governor speed signal generator 11 fails, or if a circuit break or short circuit occurs,
Since the generator speed S11 disappears, the speed deviation S15 increases and exceeds the speed deviation specified value S17. When the speed deviation S15 becomes larger than the speed deviation specified value S17, the determination unit 16 determines that
The stop command S14 is output to the generator 1 to stop the generator 1.

As described above, according to the present invention, during the operation of the generator, the speed regulating speed signal generator is broken or the circuit is broken,
Even if a problem such as a short circuit occurs, the generator can be stopped quickly and safely. In the case of the integrated control device, since the speed signal from the speed relay speed signal generator and the conventional speed control signal can be used, there is no need to newly provide a converter or the like, which is a great advantage.

In the above description, the speed signal disappears due to the failure of the speed signal generator for governor or the disconnection or short circuit of the circuit. However, conversely, the speed signal generator for governor and The same effect can be obtained even when the circuit is normal and the speed signal disappears due to a failure of the speed relay speed signal generator or a disconnection or short circuit of the circuit. However, in this case, an alarm may be issued instead of the stop command.

Further, in the above description, the failure of the speed signal generator or the disconnection or the short circuit of the circuit is detected by comparing the speeds of the two generators. It is also possible by comparing the speed and the system frequency.

[0019]

As described above, by using the speed control method and the apparatus thereof according to the present invention, even when the speed signal generator is used for the speed detection system of the generator, the speed signal generator Even if a failure or a failure such as a circuit disconnection or short circuit occurs, the generator will not be overloaded and the generator can be stopped quickly and safely, or necessary measures can be taken based on the alarm. it can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration example of an apparatus to which a speed control method of the present invention is applied.

FIG. 2 is a block diagram showing an embodiment of a speed control unit in FIG.

FIG. 3 is an explanatory diagram showing a conventional speed control method.

[Explanation of symbols]

 1 ... Generator, 2 ... Parallel breaker, 3 ... System, 4 ... Permanent magnet generator, 5 ... Speed relay, 6 ... Tachometer, 7 ... Power supply Transformer, 8 ……… Governor control device, 9 ……… Speed detection transformer, 10 ………… Undervoltage relay, 11 ………… Governor speed signal generator, 12 ………… For relay Speed signal generator, 13 ... Control device, 14 ... Control speed control unit, 15 ... Comparing unit, 16 ...

Claims (2)

[Claims] 1. A control method for controlling the speed of a generator, wherein a generator speed signal from a speed relay speed signal generator is compared with a generator speed signal from a speed governor speed signal generator, Power generation characterized by determining whether or not the speed deviation that is this output is below a speed deviation specified value, and outputting a stop command or alarm for the generator when the speed deviation is above the speed deviation specified value Speed control method of machine. 2. A control method for controlling the speed of a generator, wherein a comparison is made to compare a generator speed signal from a speed relay speed signal generator and a generator speed signal from a speed governor speed signal generator. Section and whether the speed deviation output from this comparison section is less than or equal to the speed deviation specified value, and outputs a stop command or alarm for the generator when the speed deviation is equal to or greater than the speed deviation specified value. A speed regulation control device for a generator, comprising: a determination unit.