JP2604704Y2 - Speed controller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed controller, and more particularly, to a speed controller suitable for use in an in-house power generation facility for a motor product.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional motor speed controller. In the figure, reference numeral 1 denotes a speed controller, to which a speed setter 2 and a speed detector 3 are connected. The outputs of the speed setter 2 and the speed detector 3 are connected to a proportional gain 5 via a subtractor 4 of the speed controller 1 and further to an adder 9 via a proportional term 6, an integral term 7 and a differential term 8. Connected. The output of the adder 9 is connected to the fuel control valve (or steam control valve) 10 as the output of the speed controller 1.

A fuel control valve (or steam control valve) 10 is installed in a fuel system (or steam system) of a motor 11, and the motor 11 is connected to a generator 12. The generator 12 is provided with a generator load detector 13, the output of which is connected to the droop 14 of the speed controller 1, and the output of the droop 14 is added to the output of the speed detector 3 by the adder 15. Connected.

The output of the generator 12 is connected to a private power system 17 via a circuit breaker 16. The private power system 17 is connected to a plurality of circuit breakers 18, and a load 19 is connected to each circuit breaker 18. I have. The private power system 17 is connected to a power receiving system (power purchasing system) 21 from a power company via a circuit breaker 20.

In the figure, the speed controller 1 has a single proportional gain 5, a proportional term 6, an integral term 7, a derivative term 8, a droop 1
4, each term other than the proportional gain 5 is provided as needed, and may not be present.

The speed controller 1 receives the set speed from the speed setter 2 and the detected speed from the speed detector 3 so that the set speed matches the detected speed, or the deviation between them is proportional to the generator output. The opening of the fuel control valve (or the steam control valve) 10 of the prime mover 11 is adjusted so as to perform the operation. The control response is based on the proportional gain 5 of the speed controller 1 and the prime mover 11
It is determined by the dynamic stability of the generator 12.

[0007]

However, in the conventional speed controller 1 described above, the prime mover 11 and the generator 1
The dynamic stability 2 greatly differs depending on whether the generator 12 is connected to the power receiving system, is separated from the power receiving system and carries a load, or has no load. For example, if speed control becomes unstable when disconnected from the power receiving system and becomes no-load even if it is stable while connected to the power receiving system, or speed control becomes sufficient when there is no load. In some cases, the response becomes dull when a load is applied even though the response is shown.

This is because it is impossible to control a controlled object having a different dynamic stability depending on the state of the generator with a single proportional gain. It results in failure.

The present invention has been made in view of the above circumstances, and does not cause instability even if the state of the generator changes.
It is another object of the present invention to provide a speed controller capable of performing speed control while maintaining quick response.

[0010]

According to the present invention, there is provided a power generator for detecting the state of a generator by detecting the open / close state of a circuit breaker connected to a generator, a power receiving system and each load. A plurality of proportional gains individually set according to various states of the generator, and an optimum gain corresponding to the state of the generator detected by the generator state detector. A speed controller comprising a proportional gain selection unit for selecting from a gain is provided.

[0011]

According to the above means, the state detector detects whether the generator is connected to the power receiving system, in a load state separated from the power receiving system, or in a no-load state, By selecting the optimal gain corresponding to the state by the proportional gain selection unit according to the state of the generator, stable and quick response control is always achieved.

[0012]

1 is a system diagram showing an example of a speed control device according to the present invention. In the figure, the same elements as those shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, a speed controller 1 has a plurality of proportional gains 22 connected in parallel to the output of a subtractor 4.
The plurality of proportional gain 22, for example, the optimum gain K _P when the power receiving lines 21 and interconnection, the optimum gain K _S1 ~K _Sn when responsible for 1~n th load 19, and the optimum gain K _B at no load These are set to optimal values that maintain stable and quick response in each state. The output of each optimum gain is connected to a proportional gain selection unit 23 constituted by, for example, an electronic switch. The control input of the proportional gain selector 23 is connected to the output of the generator state detector 24. The generator state detection unit 24 includes a circuit breaker 16 installed between the generator 12 and the private power system 17, and a circuit breaker 18, 20 installed between the private power system 17 and the load 19 and the power receiving system 21. Connected to detect open / close state.

The generator state detecting section 24 detects the state of the generator 12 and sends a selection signal corresponding to the state to the proportional gain selecting section 23. The proportional gain selection unit 23 selects one corresponding optimum gain from the plurality of proportional gains 22.

[0015] For example, when the circuit breaker 16 is open, since the generator 12 is unloaded away from the load 19 and the power receiving lines 21, proportional gain selection unit 23 selects the optimum gain K _B corresponding thereto . When the circuit breakers 16 and 18 are closed, the generator 12 is carrying the load 19, and the proportional gain selection unit 23 selects the optimum gain K _SX (x is 1 to n) corresponding to this. I do. When the circuit breakers 16 and 20 are closed, since the generator 12 is connected to the power receiving system 21, the proportional gain selection unit 23
Selects the optimum gain K _P corresponding to this. Thus, the speed controller 1 always performs stable and responsive speed control regardless of the state of the generator.

[0016]

According to the present invention, in the speed controller of the prime mover, the proportional gain is independently selected and set according to the state of the generator, so that the state of the generator changes. However, speed control can be performed without causing instability and maintaining quick response.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a preferred embodiment of a speed controller according to the present invention.

FIG. 2 is a system diagram illustrating a conventional speed controller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Speed controller 12 Generator 16, 18, 20 Circuit breaker 19 Load 21 Power receiving system 22 Plural proportional gains 23 Proportional gain selection part 24 Generator state detection part

Claims (1)

(57) [Scope of request for utility model registration] 1. A generator status detector for detecting the status of a generator by detecting the open / closed status of a circuit breaker connected to a generator, a power receiving system and each load, and a generator status detector for detecting various statuses of the generator. Speed control comprising: a plurality of proportional gains set in (1), and a proportional gain selecting unit for selecting an optimum gain corresponding to the state of the generator detected by the generator state detecting unit from the plurality of proportional gains. vessel.