JPS60257796A - Controller for turbo generator - Google Patents

Abstract

PURPOSE:To prevent a system frequency from decreasing by automatically increasing the output of a turbo generator when the frequency decreases. CONSTITUTION:The frequency detected by a frequency detector 5 is converted to a signal proportional to the frequency by a frequency converter 6. A comparator 7 outputs a signal to a valve controller 9 through a contact 8 which closes when connected with a system if a frequency signal decreases to the prescribed frequency or lower that a transformer 4 is burnt. The controller 9 controls a steam control valve 10 in increasing (opening) direction when the frequency decrease signal is input. Thus, it can prevent the system frequency from decreasing to continue operating without tripping a turbo generator.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a turbine generator control device, and more particularly, to a turbine generator control device that increases turbine output to raise the system frequency when the system frequency decreases.

<Prior Art> Conventionally, in this type of device, each turbine is not automatically controlled, but frequency control is performed by an operator or in a large power system using a large-capacity computer or the like for each power transmission line loop.

By the way, in conventional small-capacity power systems, when there is a sudden increase in load, the frequency decreases. In this case, unless the turbine generator output is increased to the same value as the increased load, it will continue to operate at a reduced frequency. The generators were tripped, causing the frequency to drop further and further, potentially leading to a grid outage.

<Summary of the Invention> In view of the conventional circumstances as described below, the present invention automatically increases the turbine generator output without waiting for operator's judgment when the system frequency drops, prevents the system frequency from decreasing, and finally The purpose is to prevent serious troubles such as power outages.

<Embodiments of the invention> An embodiment of the present invention will be described below.

In FIG. 1, 1 is a boiler that generates steam, 2 is a turbine that uses this steam to generate torque, 3 is a generator that converts the torque generated by this turbine into electrical output,
4 is a transformer that connects the output of generator 3 to the grid;
6 is a frequency detector that detects the rotational speed of the rotating shafts of the turbine 2 and the generator 3, that is, the frequency (the turbine and the generator are synchronous machines, so they rotate at the same frequency as the grid frequency);
is a frequency converter that converts the output of the frequency detector 5 into an electrical signal; 7 is a comparator that detects when the frequency has fallen below a predetermined value; and 8 is a contact that is turned ON when the turbine generator is connected to the grid. , 9 is a valve control means for controlling the steam control valve 10 to increase or decrease the flow rate of steam flowing into the turbine.

In this configuration, the frequency converter 6, the comparator 7, the steam control valve IO, and the valve control device 9 control the inflow of steam to the turbine 2 when the frequency becomes equal to or less than a predetermined value based on the detection signal from the detector 5. Means according to the invention are provided for increasing the amount.

Next, the operation of the above control device will be explained.

The frequency detected by the frequency detector 5 is converted by the frequency converter 6 into a signal proportional to the frequency. This frequency signal is outputted by the comparator 7 when it is determined that the frequency has decreased below a predetermined frequency determined horizontally by the transformer 4, etc., and is sent to the valve via the ON contact 8 connected to the power grid. It is input to the control device 9. When this frequency reduction signal is input manually, this valve control device 9 increases the amount of steam flowing into the turbine 2 by controlling the steam control valve 10 in the direction of increasing (opening) the generator 3 connected to the same shaft. It also increases the output of As the output of the generator 3 increases, the system frequency increases, and when this becomes close to the rated frequency, the comparator 7
The output of the turbine 2 and the generator 3 is stopped, and the output of the turbine 2 and generator 3 is no longer increased, and the frequency is stabilized near the rated frequency.

According to this configuration, when the system frequency decreases, the amount of steam flowing into the turbine 2 is automatically increased to increase the output of the generator 3, so that a decrease in the system frequency can be prevented. The turbine 29 and the generator 3 can be operated without tripping in order to protect the main transformer from burning out.

As a result, a situation such as a system power outage can be handled without developing, and damage caused by the power outage can be suppressed.

In addition, in the above embodiment, the case of a decrease in the transformer frequency has been explained, but since the voltage and frequency of the transformer are determined to be horizontal when the voltage and the frequency exceed a certain value, the voltage and the frequency are detected instead of the frequency. You can do it like this. Furthermore, if the generator has a characteristic that the machine will burn out when operated at a low frequency, it goes without saying that the same effect can be obtained by matching the setting value of the comparator to the setting of that frequency.

<Effects of the Invention> As explained above, according to the present invention, when the system frequency decreases, the amount of steam flowing into Kubin is automatically increased,
By increasing the output of the generator, it is possible to prevent a drop in the system frequency and to continue operation without tripping the turbine and generator to protect the main transformer and other shafts. , it is possible to prevent serious troubles such as grid power outages.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. 1... Boiler 2... Turbine 3... Generator 4
...Transformer 5...Frequency detector 6...Frequency converter 7...Comparator 9...Valve control device 10...
・Steam control valve

Claims (1)

[Claims] A system frequency detector of a turbine generator connected to an electric power system, and means for increasing the amount of steam flowing into the turbine when the frequency becomes equal to or less than a predetermined value based on a detection signal from the detector. Turbine generator control device.