JPH06153600A - Governor control apparatus - Google Patents

Abstract

PURPOSE:To quickly arrange the apparatus in parallel with a system by a method wherein a generator is controlled so as to be kept within a permissible frequency deviation. CONSTITUTION:When a speed regulation circuit 20 is set to 'ON', a frequency- setting device 14 is set to a value obtained by subtracting a set value in a setter 22 from the output value from a frequency detection circuit 24 to which the signal of an instrument transformer 46 on the side of a system 44 has been input. However, the set value in the setter 22 is set to a value which is smaller than the absolute value of an allowable frequency deviation between the system 44 and a generator 40. As a result, the output frequency of the generator 40 is set within the allowable frequency deviation controlled by the output of a governor control apparatus 10. In addition, the output frequency of the generator 40 is controlled to a value which is deviated by the set value in the setter 20 from the frequency of the system 44. Thereby, a point in which phases coincide can be detected surely, and the governor control apparatus can be arranged in parallel with the system 44 by quickly turning on a circuit breaker 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a governor control device for outputting a control command to a turbine connected to a synchronous generator (hereinafter, simply referred to as a generator), and more particularly to a governor control device which can be quickly paralleled to a system. The present invention relates to a governor control device having a speed control circuit incorporated therein.

[0002]

2. Description of the Related Art Conventionally, when a generator is arranged in parallel with a grid,
It is necessary to match the frequency of the generator output with the frequency of the grid.In this case, use the speed control circuit of the automatic synchronization injection device that is the external circuit of the governor control device that outputs the control command to the turbine connected to the generator. I was going. That is, when the governor control device receives the increase / decrease command pulse to the frequency (or rotation speed) setter provided by this external circuit, the governor control device controls the frequency of the generator output through the rotation speed control of the turbine. However, the frequency of the generator output was adjusted to the frequency of the grid.

[0003]

However, according to the above-mentioned governor control device, the frequency setting device in the control device is adjusted to the system frequency by the increase / decrease command pulse of the external circuit. I couldn't make it too small. Further, since the increase / decrease command pulse of the speed control circuit of the automatic synchronous closing device is given as a pulse until the frequency becomes equal to or lower than the allowable frequency, the frequency between the generator and the system may completely match in some cases. However, in this case, since there is no point where the phases match, the automatic synchronous closing device cannot output the circuit breaker closing command and the generators cannot be paralleled, so the frequency of the generator output is slightly shifted, It had to be redone by the increase / decrease command pulse from the uniform speed circuit. For this reason, there is a problem that it cannot be paralleled to the system promptly.

Therefore, an object of the present invention is to provide a governor control device which, when a generator is connected in parallel with a system, can quickly adjust the frequency of the generator output to a frequency at which parallel operation with the system is possible. To do.

[0005]

A governor control device according to the present invention outputs a control command to a turbine connected to a synchronous generator based on a set value of a frequency setter to control the rotational speed of the turbine. In the governor control device for adjusting the frequency of the synchronous generator by means, means for taking in the frequency detection value of the system, and the absolute of the allowable closing frequency deviation of synchronization between the system and the synchronous generator from the frequency detection value of the system. It is characterized in that it is provided with a uniform speed circuit comprising means for switching the set value of the frequency setter to a value shifted by a predetermined value smaller than the value.

[0006]

According to the governor control device of the present invention, a speed adjusting circuit having a function of adjusting the frequency of the system directly to the governor control device and adjusting the frequency, that is, a speed adjusting function required for automatic synchronization is provided. The speed circuit also has a function to prevent the frequency deviation from becoming zero within the allowable frequency deviation. As a result, it is possible to always detect a point where the phases of the generator and the grid match within the allowable deviation frequency, and it is possible to quickly put the generator in parallel with the grid.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a governor control device according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a systematic connection diagram of a governor control device showing an embodiment of the present invention. In FIG. 1, reference numeral 1
Reference numeral 0 indicates a governor control device, and the output of the governor control device 10 is connected to control the needle 34 via the electro-hydraulic converter 32. The water turbine 38 is rotated by the flow rate of water determined by the opening degree of the needle 34, and this rotational energy is transferred to the water turbine 38.
The generator 40 connected to the converter converts the electric energy.
This is the output of the generator 40, and the output of the generator 40 is connected to the grid 44 via the circuit breaker 42. Furthermore, the governor control device 10 has a new speed control circuit 20 built therein, and the output of the speed control circuit 20 and the output of the frequency setting operation device 12 are input to the frequency setting device 14 via a contact point 26 and b contact point 28, respectively. The frequency of the generator 40, which is detected via the instrument transformer 48, is input to the frequency detection circuit 16, and the deviation between the output of the frequency setting device 14 and the output of the frequency detection circuit 16 is input to the frequency adjuster 18. The deviation between the output of the frequency adjuster 18 and the output of the opening detector 36 is input to the opening adjuster 30. Also,
The uniform speed control circuit 20 newly provided is a frequency detection circuit 24,
The frequency detection circuit 2 having a setter 22 and an a contact 26
Reference numeral 4 is an input of the frequency of the system 44 detected through the instrument transformer 46, and the output of the frequency detection circuit 24 and the setting device 2
The deviation from the set value of 2 (a predetermined value smaller than the absolute value of the synchronous closing allowable frequency deviation) is input to the frequency setter 14 via the a contact 26.

The governor control device 10 configured as described above
In the frequency adjuster 18, the optimum needle opening is calculated based on the deviation between the value of the frequency setter 14 and the detected value of the frequency detection circuit 16 which receives the signal of the instrument transformer 48, and the opening adjuster is calculated. At 30, the control command based on the deviation between this calculated value and the needle opening detection value by the opening detector 36 is calculated, and this control command is output to the electro-oil converter 32. The needle 34 opens and closes according to the output of the electro-hydraulic converter 32, and controls the flow rate of water to the water turbine 38 as described above. Rotational energy proportional to the flow rate of this water
The generator 40 connected to the converter converts the electric energy.
Here, the newly provided speed control circuit 20 operates as follows.

The frequency setting device 14 is usually a uniform speed circuit 20.
The value changes according to the increase / decrease signal of the frequency setting operation device 12 connected by the b contact 28 which is closed in the "OFF" state. However, when the speed control circuit 20 is turned "ON", the contact point 26 which is closed in the "ON" state is used to set the output value of the frequency detection circuit 24 which receives the signal from the instrument transformer 46 on the system 44 side as an input. The frequency setting device 14 is set to a value obtained by subtracting the setting value of the device 22. However, here, the set value of the setter 22 is smaller than the absolute value of the allowable frequency deviation between the grid 44 and the generator 40. As a result, the output frequency of the generator 40 is within the allowable frequency deviation controlled by the output of the governor control device 10. Moreover, since the output frequency of the generator 40 is controlled to a value that is deviated from the frequency of the grid 44 by the set value of the setter 22, the point where the phases match can be detected without fail, and the breaker 42 is quickly closed. And can be paralleled with the system 44.

As shown in FIG. 2, the uniform speed circuit 20 has a frequency conversion circuit 50 for detecting the frequency of the system 44.
However, when it is outside the governor control device 10, it is possible to omit the frequency detection circuit 24 shown in FIG. 1 by using the signal of the frequency conversion circuit 50.

[0012]

As is apparent from the above-described embodiment, according to the present invention, the speed control circuit necessary for automatic synchronization is provided in the governor control device to directly take in the frequency of the system so that the frequency falls within the allowable frequency deviation. By controlling the frequency of the generator and preventing the frequency deviation from becoming zero within the range, the phase between the generator and the grid matches at the frequency within the allowable frequency deviation. The points can be detected without fail and can be quickly paralleled to the grid.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various design changes can be made without departing from the spirit of the present invention. Is.

[Brief description of drawings]

FIG. 1 is a system connection diagram showing an embodiment of a governor control device according to the present invention.

FIG. 2 is a main part system connection diagram showing another embodiment of the governor control device according to the present invention.

[Explanation of symbols]

 10 Governor Control Device 12 Frequency Setting Operator 14 Frequency Setting Device 16 Frequency Detection Circuit 18 Frequency Controller 20 Frequency Adjusting Circuit 22 Setting Device 24 Frequency Detection Circuit 26 a Contact 28 b Contact 30 Opening Controller 32 Electro-Oil Converter 34 Needle 36 Opening Detector 38 Turbine 40 Generator 42 Circuit Breaker 44 System 46 Meter Transformer 48 Meter Transformer 50 Frequency Converter Circuit

Claims (1)

[Claims] 1. A governor control for adjusting the frequency of the synchronous generator by outputting a control command to a turbine connected to the synchronous generator based on a set value of a frequency setter to control the rotational speed of the turbine. In the device, means for taking in the frequency detection value of the system, and a value deviated from the frequency detection value of the system by a predetermined value smaller than the absolute value of the synchronous closing allowable frequency deviation between the system and the synchronous generator. A governor control device, comprising: a uniform speed circuit including means for switching a set value of a frequency setter.