JPH03289325A - Output controller for generator - Google Patents

Abstract

PURPOSE:To improve the reliability and durability of a generator system by providing the power detector, power setter, and timing device to the generator and synchronizing the power generation of the generator with commercial power supply by giving an output signal to a controller, and then, controlling the output of the generator in two stages at the time of starting a combustion engine only. CONSTITUTION:A load power detector 5a, power setter 5b for a generator 2, and timing device 5c which sets the warming time when the output of the generator 2 is controlled in stages are specially provided. Parallel operation of the generator 2 with commercial power supply 3 at a fixed level is performed by means of a synchronizing device 7 by using a breaker 4 for generator by starting the device 5c simultaneously with a combustion engine and inputting the condition where the warming signal of the device 5c, generator-voltage establishing signal of the detector 5a, and fixed output signal of the generator by the setter 5b are simultaneously materialized to a controller 6. Then an all-load output is controlled after warming operation is performed by executing a forced two-stage output. Therefore, the adverse influence to the combustion engine under the full-load operation can be prevented when the combustion engine is cold.

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 when it is cold.

[Prior Art] Fig. 4 is a block diagram showing a conventional generator output control device disclosed in Japanese Patent Application Laid-Open No. 61-244228. In the figure, 1 is an internal combustion engine, and 2 is a power generation 3 is a commercial power source, 4 is a breaker for the generator, 10 is a breaker for commercial power source, 5 is a power detector, 6 is a control device, 7 is a synchronization switch for synchronous operation of the generator 2 and the commercial power source 3 In the apparatus, 8 is a speed governor that controls the rotational speed of the internal combustion engine 1, and 9 is a load connected to a generator. In addition, FIG. 5 is a power distribution diagram during generator operation, where 11 is load power, 12 is a power setting value of load power 11, 13 is a generator constant output setting value that sets the output of power generation 41!2, 14 is a generator output curve. FIG. 6 is a power distribution diagram at the time of starting the generator.

Next, the operation will be explained. First, let's start with the internal combustion engine l in Figure 4.
The generator 2 is driven, and the power detector 5 monitors the generator output when a single load is supplied.

Therefore, when the idle load 9 is turned on, the commercial power source 3 and the generator 2 are operated in parallel to increase the starting capacity when the load is started, and the load is placed on the commercial side. After that, when the load 9 has finished starting and becomes lighter, the commercial power supply 3 is opened by opening the commercial power supply circuit breaker 10.
The generator 2 is disconnected from the line and the generator 2 is operated independently by the internal combustion engine 1.

During such operation, the load power 11 is monitored by the power detector 5. At that time, the load power 11 is the power setting value P.

When (12) is exceeded, the control device 6 generates an output command to operate the synchronization device 7 and close the commercial power supply 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 output of the starter 2 always maintains constant power. Figure 5 shows the power distribution diagram, and beyond the power set value P, (12), only the constant generator output 13 is given as an index of the load power 11, and no special control is applied. has not been applied. That is, when performing such operation, the conventional generator output curve 14 changes from zero output to the generator constant output set value PG (13) as shown in FIG. ) until – the power was increased.

[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 load power. However, when the internal combustion engine suddenly enters 100% load operation from a cold state, extreme thermal expansion occurs in the engine cylinder and cylinder head, and bubbles form in the cooling water, causing a temporary air pocket phenomenon, and heat is released. The heat is not transferred to the cooling water, which causes cracks to develop around the cylinder, shortening the engine's lifespan and increasing fuel consumption until the engine reaches 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 to start up.

[Means for Solving the Problems] A generator output control device according to the present invention detects the state of a load driven by a commercial power source using a load power detector, and a control device that receives the detected signal as an input. , a generator that starts the internal combustion engine and ramps it up to the step output control voltage when the usage amount of the commercial power source exceeds the power setting value; and a generator that starts the internal combustion engine at the same time as the start of the internal combustion engine, and a timer that starts the timer at the same time as the internal combustion engine starts, and A condition for the simultaneous establishment of the signal, the establishment signal of the generated i voltage by the power detector of the generator, and the generator constant output signal by the power setting device is input to the control device, and the breaker for the generator is turned on to start the generation. The system is equipped with a synchronization device that performs parallel operation with a commercial power source at a constant machine output, and performs two-stage forced output to perform full-load output control after warm-up operation.

[For production]

The generator output control device in this invention detects the load power with a power detector, starts the generator, performs two-stage output control with the generator power detection device only at the time of starting, and generates electricity after the warm-up of the internal combustion engine is completed. Since the machine's full load is controlled at a constant level,
It is possible to prevent an adverse effect on the internal combustion engine during full load operation when the internal combustion engine is cold.

[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 FIGS. 4 to 6 are indicated by the same reference numerals. In FIG. The power setting device 5c is a timer for setting the warm-up time during step control output. Further, Fig. 2 is a power distribution diagram in this case, in which the internal combustion engine I is started at the power set value 12, a step output 13a that does not adversely affect the engine is output, and after the engine warm-up operation is completed, the generator is started. Perform operation at constant output 13. FIG. 3 is an enlarged view of the power distribution at the time of starting the generator, and shows that the step output 13a is under step output control of, for example, 50%.

Next, the operation will be explained. First, the load 9 is normally driven by the commercial power source 3 while monitoring the amount of purchased power using a demand monitoring device (not shown). The operating status of this commercial power source 3 is constantly monitored by a load power detector 5a, and the status is input to the control device 6. Now, for example, for the power setting value 12 (power purchase contract value (Psct)), the power usage (power purchase amount (p, 1s)) is PsctX
When o, 3≦P IIs is reached, the internal combustion engine 1, which is an internal combustion power generation equipment, starts to start, and the power generation 82 reaches the step output 13.
First stand up to a. The power detector 5 monitors whether a step voltage has been established and the power generation l! i! When the control device 6 confirms three conditions: that the voltage has been established, that the generator breaker 4 is open, and that the voltage of the commercial power source 3 is in a predetermined state, the synchronization device 7 is activated. , turn on the generator breaker 4. At this time, the synchronization bag [7 synchronizes the output voltage and frequency of the generator 2 based on the power supply voltage and frequency of the commercial power supply 3, and outputs a synchronization signal when the synchronization reaches a match. He is trying to perform the closing operation of the generator breaker 4. During this period, the engine warm-up operation time Ti after the start of the internal combustion engine 1 is gained by the delay operation of the timer 5c, and after the warm-up operation is completed, the generator enters the operating state with constant output 13 shown by hunting in FIG. 2.

〔Effect of the invention〕

As described above, according to the present invention, a generator output control device is provided with a generator power detector, a power setting device, and a time limit device, and the respective output signals are provided to the control device to synchronize with the commercial power source. and the generator output is set to 2 only when starting the internal combustion engine.
Since the internal combustion engine is configured to perform step output control, the internal combustion engine is automatically warmed up, eliminating any negative effects on the engine, and improving the reliability and durability of the generator system.

Furthermore, the energy saving effect due to the reduction in fuel consumption is also significant.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram of a generator output control device according to an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams of the power distribution characteristics of FIG. 1, and FIG. 4 is a diagram of a conventional generator. FIGS. 5 and 6 are block diagrams of the output control device, and are explanatory diagrams of the power distribution characteristics shown in FIG. 4. In the figure, 1 is an internal combustion engine, 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, 9 is a load, and 5a is a load 5b is a power detector, 5C is a timer, 12 is a power setting value, 13 is a generator-constant output, 13. a is a step output, and 14 is a generator output curve. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 2

Claims (1)

[Claims] A control device that detects the state of a load driven by a commercial power source using a load power detector and receives the detected signal as input, and an internal combustion control device that ramps up to a step output control voltage when the usage amount of the commercial power source exceeds a power setting value. a generator driven by the start of the engine, a timer that starts operating at the same time as the start of the internal combustion engine, and a time-up signal for the timer;
A simultaneous establishment signal of the generator voltage establishment signal from the power detector of the generator and a generator constant output signal from the power setting device is input to the control device, and the generator breaker is turned on to set the generator constant output. A generator output control device equipped with a synchronization device that performs parallel operation with a commercial power source.