JPH0429526A - Generator output controller - Google Patents

Abstract

PURPOSE:To eliminate adverse influence on an internal-combustion engine by providing output signals from a power detector, a pulse generator and a time limit unit to a controller in order to operate generators in parallel while synchronizing with commercial power supply and controlling the outputs from the generators, in step, only when the internal combustion engine is started. CONSTITUTION:When the output from a generator 2 reaches a power set value 12Po, a pulse generator 5a and a time limit unit 5b are actuated. A time T1 to be elapsed before the output from the generator 13 reaches 50% of rated value is preset and the number of pulses is counted during the time interval. Output from an AND 5c is then provided to a controller 6 in order to sustain constant light load operation. Upon elapse of the set time T1, output from the generator 2 is blocked from increasing for a time interval T2. Upon elapse of the time interval T2, the time limit unit 5b confirms warming of an internal combustion engine 1 and then the output from the generator increases toward a constant full load output during a time interval T3. When the output of genera tor reaches a constant set output, the time limit unit 5b stops provision of output and the AND 5c is turned OFF, thus sustaining the generator output, as it is, through the controller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a generator output control device that properly starts an engine during cooling.

[Conventional technology]

FIG. 5 is a block configuration diagram showing a generator output control device in the conventional power load input control method for internal combustion power generation equipment disclosed in Japanese Patent Application Laid-Open No. 61-244228. , 2 is a generator, 3 is a commercial power source, 4 is a breaker for the generator, 5 is a power detector, 6 is a control device, 7 is a synchronization device for synchronously operating the generator 2 and the commercial power source 3, 8 is a A speed governor controls the rotational speed of the internal combustion engine 1, 9 is a load as a generator output device, and 1o is a commercial power supply circuit breaker. Further, FIG. 6 is a power distribution diagram during generator operation, where 11 is the load power, 12 is the power setting value of the load power 11, and 13 is the generator constant output setting value that sets the output of the generator 2. . FIG. 7 is a power distribution diagram at the time of starting the generator, and 14 is the generator output curve.

Next, the operation will be explained. First, let's start with the internal combustion engine l in Figure 5.
The generator 2 is driven by the generator 2, and the power detector 5 monitors the generator output when a single load is supplied.
When turning on the power source, the commercial power source 3 and the generator 2 are operated in parallel to increase the starting capacity at the time of load start-up, and the load is placed on the commercial side. Thereafter, when the load 9 becomes lighter, the commercial power source breaker 10 is opened to disconnect the commercial power source 3, and the generator 2 driven by the internal combustion engine 1 is operated independently. In such operation, the power detector 5 monitors the load power 11. At that time, when the load power 11 exceeds the power set value P,12, the control device 6 generates an output command, drives the synchronization device 7, and closes the commercial power supply circuit breaker IO. Then, the commercial power source 3 and the generator 2 are switched to parallel operation. In this way, the power shortage of the generator 2 is covered by the supply of the commercial power source 3. In this case, the generator 2 always outputs constant electric power. FIG. 6 shows the power distribution diagram, in which the entire load was covered with a constant output of load power 11 with the power setting value 12 as the boundary.

When performing such operation, the conventional generator output curve 14 is such that from the point exceeding the power set value 12, the output is increased from zero to the generator constant output set value Pc, 13, as shown in FIG. Ta.

[Problem to be solved by the invention]

Since the conventional generator output control device is configured as described above, the generator output is controlled to be constant by detecting the power of the load. However, when operating at 100% load all at once from a cold state, extreme thermal expansion occurs in the engine cylinder, cylinder head, etc., and bubbles form in the cooling water, causing a temporary air pocket phenomenon, and heat is transferred to the cooling water. In addition to shortening the engine's lifespan, the problem was that fuel consumption increased until the engine reached a stable state.

This invention was made to solve the above-mentioned problems.When the engine is cold, the power detector detects the load power to start the engine, and by detecting the power of the generator, it does not adversely affect the engine. It is an object of the present invention to provide a generator output control device capable of generating generator output in stages by controlling the start-up of the engine in a stepwise manner so as not to cause the engine start-up.

[Means to solve the problem]

The generator output control device according to the present invention includes a pulse generator that generates a pulse signal in accordance with governor characteristics after starting the internal combustion engine and parallel operation of the generator, and generating a predetermined program time-limited output signal. inputting a signal for controlling the generator output in a stepwise manner from the output signal of the timer and the output pulse signal of the pulse generator into the control device;
In addition to the speed governor and drive control using the timer, it continues parallel operation with the commercial power supply and generator output, and when the set value of the generator - constant output is reached, it is configured with a synchronization device that maintains this. It is something.

[For production]

The generator output control device according to the present invention detects the power difference between the received contract power amount and the load power using a power detector,
When the difference exceeds a predetermined value, the generator is started, and only when the generator is started, two-stage output control for speed governor drive is performed using a pulse generator and timer that match the characteristics of the engine speed governor, and the engine When the warm-up operation is completed, the generator shifts to full-load constant output control, so that the engine will not be adversely affected during full-load operation during engine cooling.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the same parts as in FIG. 5 are designated by the same reference numerals. In FIG. This is a timer that sets a warm-up time for two-stage output control in accordance with engine governor characteristics and generator output power, and controls the output of the generator 2 by a combination of a power detector 5 and a control device 6.

FIG. 2 is an explanatory diagram showing the power distribution in this invention, in which the internal combustion engine 1 is started at the power detection value 12P, and the two-stage output control (output L=
, 50%Pc) 13a, and after the engine warm-up operation is completed, the generator constant output 13 is performed.

FIG. 3 is an enlarged view of the power distribution at the time of starting the generator, showing the detailed operation of the two-stage output control 13a. Further, the time limit bag W5b has a program setting function, and generates an output signal during times T1 and T4, but stops outputting the signal after hours T2 and 13 have elapsed. A pulse signal outputted from the pulse generator 5a at the output signal generation time of T, , T3 is inputted to the control device 6 through a logical product (AND) 5i.

Next, the operation will be explained with reference to the flowchart in FIG. First, in the generator output control, the power detector 5 detects the difference between the contract power received by the commercial power source 3 and the power used by the load 9, and when the latter power is large, the control device 6 starts the internal combustion engine 1. Generator 2 according to engine governor characteristics
make it work.

Thereafter, the breaker 4 is turned on by the synchronization turning on device 7 (the breaker 10 is turned on), and parallel operation of the commercial power source 3 and the power generation@2 is started (step 5TI).

In this state, an increase command is given to the governor motor to gradually increase the generator output as shown in Fig. 2 (here, the generator output and the governor characteristics of the internal combustion engine are approximately proportional) (step 5T2). The output of the machine 2 is constantly monitored by a power detector 5. In this state, the output is set to 1
2P, the pulse generator 5a is activated as shown in FIG.
and the timer 5b start operating at the same time (step 5
T3). First, the speed governor 8 is driven by the timer 5b by presetting a time T for the generator constant output 13 to reach 50% as shown in FIG. 3, and counting the number of pulses during this time.
The output of D5C is applied to the control bag W6 and forcedly outputted to continue the light load constant output operation (step 5T4).

Next, when the elapsed time passes the set time T, the output increase of the generator 2 is stopped for 12 hours. The output of the timer 5b is also stopped, the output of the AND 5c is turned off, and the input signal to the control device 6 is stopped. Next, when 12 hours have passed, the timer 5b
It is confirmed that the internal combustion engine 1 has warmed up, and after the warm-up operation is completed, the output is increased again toward the generator full load constant output for time T1 (step 5T5). During this time, the governor motor increases
The command continues (step 5T6). Thus, when 13 hours have passed and the output of the generator 2 reaches the generator constant output setting value, the timer 5b stops the output, the output signal of the AND 5c is turned off, and the control device maintains the generator output in that state. (Step 5T7).

〔Effect of the invention〕

As described above, according to the present invention, the power detector, the pulse generator, and the timer are provided in the output control device of the generator,
Each output signal is given to the control device to synchronize with the commercial power supply and operate the generator in parallel, and the generator output is controlled in a stepwise manner only when the internal combustion engine is started, thereby preventing adverse effects on the internal combustion engine. However, it is possible to obtain a device that is inexpensive, has high reliability, and is highly durable. Further, since the internal combustion engine is controlled by the governor only when starting, fuel consumption is reduced and energy saving effects are also large.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a generator output control device according to an embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams showing the power distribution of the invention, and Fig. 4 is the operation of Fig. 1. FIG. 5 is a block diagram showing the configuration of a conventional generator output control device, and FIGS. 6 and 7 are explanatory diagrams showing conventional power distribution. In the figure, 1 is an internal combustion engine, 2 is a generator, 3 is a commercial power source, 5 is a power detector, 6 is a control device, 7 is a synchronization device,
8 is a speed governor, 5a is a pulse generator, and 5b is a timer. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A control device that detects the power state of a load driven by a commercial power source using a power detector and controls a generator using the detection signal as one input; In a generator output control device having a generator that starts an internal combustion engine to start generating electricity,
a pulse generator that generates a pulse signal in accordance with the speed governor characteristics after starting the internal combustion engine and parallel operation of the generator; a timer that generates a predetermined program time limit output signal; and an output signal of the timer and the A signal for controlling the generator output stepwise from the output signal of the pulse generator is input to the control device, and parallel operation with the commercial power supply and the generator output is continued in conjunction with governor drive control by the timer. and a synchronization device that maintains a set value of a constant output of the generator when it reaches a set value.