JPS6039400A - Output controller of turbine generator - Google Patents

Abstract

PURPOSE:To always maintain a bus frequency constant even if the output of a main engine is varied by controlling the output of a turbine generator to hold vapor pressure constant. CONSTITUTION:A frequency controller 2 compares a frequency setter 1 with the output of a bus frequency detector 10 at a shaft generator 7 side, outputs a current set value, and a current controller 3 applies a deviation between the current set value and a current signal of a current transformer 9 for an instrument through a motor-driving/generating mode switching circuit 4, phase controllers 5, 6 to a thyristor inverter 8. A vapor pressure controller 28 compares the output of a vapor pressure setter 26 with the output of a vapor pressure detector 27 for detecting the vapor pressure of a boiler drum, outputs a power set value, and a power controller 15 applies a deviation between the power set value and the output of a power converter 20 to a governor controller 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an output control device for a turbine generator that operates in parallel with a generator having a frequency control system.

In ships, turbine generators driven by the exhaust gas energy of the main engine are often operated in parallel with, for example, shaft generators. Fig. 1 is a block diagram showing a conventional output control device for this type of turbine generator together with a control device for a thyristor inverter type shaft generator. ) is the frequency control circuit, (3) is the current control circuit, (4) is the operation mode switching circuit for the thyristor inverter (8), (5) and (O) are the phase control circuit, and (7) is the shaft generator, respectively. The output of the shaft generator shown in FIG. There is.

Further, (9) indicates an instrument current transformer, (10) indicates a bus frequency detector, and Q sword indicates an instrument transformer.

Next, (14) shows a power setting device, 05) shows a power control circuit as an output adjustment section, and a voltage transformer (21)
and the power converter to which the meter current transformer (22) is connected) are connected to this power control circuit (+5). In addition, the output of the power control circuit is connected to the governor control circuit (10), and the governor control 1 circuit α6 is connected to the governor up signal relay α7) and the governor down signal relay (1
8) is connected. Note that (19) indicates a governor motor, ell.) indicates a turbine generator, and 2) indicates a turbine.

The operation will be explained below.

First, on the shaft generator side, the outputs of the frequency setter (1) and bus frequency detector (10) are compared and amplified by the frequency control circuit (2), and the output is sent to the current control circuit (2) as the current setting value.
3), and the current signal of the instrument current transformer (9) is added to this current control circuit (3) as a current detection value. The output of this current control circuit (3) is given to the phase control circuits (5) and (6) via the thyristor inverter electric/power generation mode switching circuit (4), and the output of the shaft generator, that is, the thyristor inverter (8). The output of the bus is controlled to keep the bus frequency at a constant value.

Next, on the turbine generator side, the set value of the power setting device (14) and the output of the power detector QO) are compared and amplified in the power control circuit (to), and the output is determined by the governor control circuit α6).
activates the governor up signal high interval or low governor signal relay (18). As a result, the governor motor of the turbine is controlled and the output of the turbine generator is adjusted to the power setting device (1
4) is controlled to the set value.

Therefore, when the load is larger than the power setting value (6), the shaft generator (7) is operated as a generator, and in the opposite case, the shaft generator (7) is operated as a motor.

Conventional turbine generator output control devices are configured as described above, so when the turbine output decreases due to a decrease in the output of the main engine, etc., the setting value of the power setting device (b) can be artificially adjusted. The drawback was that it had to be done.

The present invention has been made to eliminate the above-mentioned drawbacks.
The object of the present invention is to provide a turbine generator output control device that can automatically adjust the turbine generator output according to output fluctuations of a main engine.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing an example of the configuration of the output control device for a turbine generator according to the present invention together with a control device for a shaft generator in the same way as in FIG. 1. The same reference numerals as in FIG. indicate the same element. And power setting device Q →
In addition to removing the boiler drum steam pressure setting device (
261, a steam pressure detector body 7) that detects the steam pressure of the boiler drum, and a steam pressure control circuit (28 ) is newly provided, which is different from Figure 1.

The operation will be explained below, focusing on the parts shown in FIG. 1 and the configuration.

First, an appropriate value corresponding to the operating output of the main engine is set using the steam pressure setting device (b)), and this set value and the detected pressure of the boiler drum are compared and amplified by the steam pressure control circuit (28). The output is applied to the power control circuit (ron) as a power setpoint.

The power control circuit unit) compares and amplifies the output of the steam pressure control circuit μs) and the output of the power converter, and outputs the governor control circuit (
In addition to 16), the governor control circuit αG) controls the governor so that the steam pressure in the boiler drum is constant, thereby controlling the output of the turbine generator. If the governor of a turbine generator running in parallel is controlled to raise or lower when the load is constant, the frequency of the line will fluctuate. Since the shaft generator is controlled by the frequency control circuit (2) to keep the bus frequency constant, the bus frequency is ultimately kept constant even if the output of the turbine generator fluctuates.

As is clear from the above explanation, according to the turbine generator output control device of the present invention, the output of the turbine generator is controlled to keep the steam pressure constant. An excellent effect has been obtained in that even if the output fluctuates, no manual adjustment is required and the bus frequency can always be maintained constant.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of a conventional turbine generator output control device together with a control device for a shaft generator operated in parallel with this turbine generator, and Fig. 2 is a block diagram showing the configuration of a conventional turbine generator output control device. FIG. 1 is a block diagram showing the configuration of an embodiment of an output control device for a motor, together with a control device for a shaft generator operated in parallel with this turbine generator. (2) Frequency control circuit (3) 11 Current control circuit (7) Shaft generator (8)
@Volume thyristor inverter 05)... Power control circuit θ0)... Governor control circuit (
19) Governor Motor Co., Ltd. Power converter example...
Turbine generator (25), e-turbine (tsuba, steam pressure setting device (27)
)...Steam pressure detector μs)...Steam pressure control circuit agent Masuo Oiwa

Claims (1)

[Claims] In an output control device for a turbine generator that operates in parallel with a generator having a frequency control system, there is a steam pressure adjustment section that compares and amplifies the steam pressure set value and steam pressure detection value of the boiler drum, and the output of this steam pressure adjustment section. and an output adjustment unit that compares and amplifies the detected power generation output value to obtain a signal for operating the turbine governor, and controls the turbine governor using the output of the steam pressure adjustment unit as an output reference value of the generator. An output control device for a turbine generator, characterized in that the steam pressure in the boiler drum is controlled to be constant.