JPS6169336A - Number control system of generators - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention Technical Field The present invention uses a plurality of internal combustion engines to fully rotate an alternating current generator that individually corresponds to each internal combustion engine, and uses electricity and power from the alternating current generator to power a motor, etc. In the prior art, the number of generators that drive the rotation of fans and pumps is controlled by centrifugal fluid machines, such as centrifugal or axial flow type.As shown in FIG. Internal combustion engine E1. J2. Alternator Gt by E3.

G2. G3 is rotationally driven. Internal combustion engine E1. , E
2. For E3, suit) #5pV1, V2, V3i
Fuel is supplied through. AC departure N machine G 1. y
' The power from G 2 *G3 is led to line 6. With the increase in the load power on line 6, the internal combustion engine El
.

E2, E3, therefore the alternator Gl, G2°G3
The number of vehicles in operation will be increased.

In this prior art, as shown in FIG. Generator G2 is driven. The AC stimulator Gl is similar to the one you cut out,
G2 is in operation, and their AC power generation 14G1. G
When the load power reaches the load power H2a of, for example, 90 inches of the load power H2 corresponding to the maximum capacity of 2, the third white alternator G3 is driven. Therefore, in the prior art,
AC speaking machine Gl, G2. Continuous rotation may be performed with a load power corresponding to the maximum capacity of G3.

Also, with the decrease in load power, AC 1 torpedo generator Gl.

G2. When reducing the number of G3 units in operation, AC generator ηa, Sakura Gl, G2. In order to prevent the hunting phenomenon in which the drive of G3 is repeatedly stopped, the load power H1a at startup,
Load lower than T-I 2 a ■Squid H1, b, H2b
AC power generation 1%G2. The number of G3 vehicles in operation will be reduced. In this way, AC torpedo generators Gl, G2. G3 always operates at more than the load power corresponding to the large capacity, and therefore has poor thermal efficiency.

! 1 Problems to be solved by the present invention Objectives of the present invention (
The purpose of the present invention is to provide a complete system for controlling the number of generators, which enables the AC generators individually driven by a plurality of internal combustion engines to operate at maximum capacity, and improves efficiency even further by kneading. .

Means for Solving All Problems The present invention (rL, number of internal combustion engines drives an alternating current generator individually corresponding to the internal combustion engine, energizes the motor with electric power from the alternator, and the motor is centrifugal. When a fluid machine is rotationally driven and the load '1i and the force exceed a predetermined value corresponding to the solid wave number of a certain alternator in operation, the rotation speed of the internal combustion engine 1]^1 in operation is lowered so that the power capacity of the alternator is close to the load power and is equal to or higher than the load power, and the difference between the power generation frequency at this time and the predetermined frequency is greater than or equal to the predetermined value ′?f, This is a system for controlling the number of internal combustion engines for power generation, which is characterized by starting the remaining internal combustion engines when the engine continues for a predetermined period of time.

The working motor is energized by electric power from the alternating current generator I☆,
This motor rotationally drives the centrifugal fluid machine.

The rotational speed of the motor is approximately proportional to the frequency of the alternator. On the other hand, the power required for rotationally driving a centrifugal fluid machine is approximately proportional to the cube of the rotational speed of the centrifugal fluid machine.

Therefore, when the load power increases and exceeds a predetermined value corresponding to the frequency of an operating alternator, for example, the rated load power corresponding to the maximum capacity, the rotational speed of the operating internal combustion engine is reduced. This reduces the rotational speed of the motor. Therefore, the power required to drive the rotation of the centrifugal rotating machine is significantly reduced. The load power energizing the motor is therefore reduced, causing the power capability of the alternator to be close to or greater than the load power. A possible cause for increasing the load power as described above is, for example, when one of the plurality of motors that is currently in operation is suddenly started. When starting such a motor, the load power increases for a relatively short period of time. Therefore, if the difference between the power generation frequency and the predetermined frequency remains at or above the predetermined value and lasts for less than the predetermined time, e.g. less than 3 to 5 minutes, it is not necessary to start the remaining internal combustion engine. Instead, it is sufficient to continue operating only the AC generator before the increase in load power and power. When the difference between the power generation frequency and the predetermined frequency remains at or above the predetermined value for a predetermined period of time, the alternator that was operating before the load power increase is sufficient to maintain the current level before the load power increase. It is determined that it is not possible to supply load power and power at the generation frequency, so all remaining internal combustion engines are started and parallel operation is performed using a new alternating current generator. In this way, when the load power increase time is relatively short, a new alternator is often started up, and power is supplied by the alternator that was operating before the load power was increased. It becomes possible to operate the alternator near the rated value, and it is possible to improve the thermal efficiency of the internal combustion engine.

Example FIG. 1 is a block diagram of one embodiment of the present invention.

Internal combustion engine El, E2. Alternator G1, G by E3
2. G3 is rotationally driven. Internal combustion engine El.

E2. E3 is supplied with fuel from pipe 1 to throttle valve Vl.
, V2, and V3i. Slot #valve V
1, V2, V3 (7) Opening degree c, speed p
Clause BSL.

It is controlled by S2 and S3. Speed regulator S1゜8
2.83 is controlled by a processing circuit 2 realized by a microcomputer or the like. This processing circuit 2 controls synchronization testers Yl, Y2, Y3@ for parallel operation of alternators Gl, G2, G3. AC generator Gl, G2. Electricity from G3.

Power is supplied from line 6 through overload trace disconnector 3, 4.5i. The power generation frequency on this line 6 is detected by a frequency detector 7, and the load power is detected by a wattmeter 8, and these detected values are provided to the processing circuit 2. Power from line 6 is connected to switches Wl, W
2. W3 is applied to any motor M1, M2, M3, such as an induction motor or a synchronous motor. These motors Ml
, M2, and M3 drive the centrifugal fluid machines Ll, L2, and L3 one rotation. Centrifugal fluid machine Ll, L2. L3 is a fan or pump of any type, such as a centripetal type or an axial flow type, and the life force required for rotational drive is approximately proportional to the cube of the rotational speed.

Referring to FIG. 2, internal combustion engine 1 is being operated and alternator G1 is rotationally driven, switch W1 is turned on,
Assume a platform in which the motor M1 is energized by this η force, and the centrifugal fluid machine L1 is rotationally driven. This j
In case (y), it is assumed that the switch W2 is further turned on and the motor M2 is energized. The processing circuit 2 includes
Each alternator G1, G2. A predetermined power value corresponding to the power generation frequency of G3, for example, each alternator Gl, G2.
The maximum rated capacity corresponding to each frequency of G3 is stored. After turning on the switch W2, if it is determined that the load power detected by the wattmeter 8 exceeds the maximum capacity of the alternator G1 corresponding to the frequency detected by the power generation frequency detector 7, the processing circuit 2 Speed regulator 812
This reduces the opening degree of the throttle valve V1 and lowers the rotational speed of the internal combustion engine E1. This reduces the power generation frequency of the alternator G1. At this time, the rotational speed of the motors Ml and M2 decreases, and the centrifugal fluid machines Ll and L
The power required for 2i rotational drive is significantly reduced. Therefore, the load power is greatly reduced. At this time, the rotational speed of the internal combustion engine E1 is controlled such that the power capacity of the alternator G1 is close to the load power and exceeds the load power. The processing circuit 2 calculates the difference between the power generation frequency detected by the power generation frequency detector 7 and a value predetermined in the processing circuit 2 . When this difference is greater than or equal to a predetermined value, the processing circuit 2 measures the time that the difference lasts. This duration is a predetermined time, for example, 3 to 5 minutes, and if the power generation frequency during steady operation of motors Ml and M2 returns to the frequency before turning on switch W2, single-machine operation of only alternator G1 is started. continue. In this way, it is possible to operate the alternator G1 at the very edge of the maximum rated output limit, and it is possible to improve the thermal efficiency of the internal combustion engine E1.

After the switch W2 is turned on, the power generation frequency decreases, and when the difference between the power generation frequency and the predetermined frequency remains equal to or higher than the predetermined value for the predetermined time, the processing circuit 2 activates the other internal combustion engine E2i. Activate phase detector Y1. ．． alternator Gl by Y2 and processor 2;
Enter G2 parallel operation.

Referring to FIG. 2, when the load power exceeds the maximum capacity of the first alternator G1, another second alternator G2 is started to operate. When the load power further increases and reaches the load power corresponding to the large capacity of the AC generator η1QG1, G2 (f, t), another AC generator G3 is driven by the internal combustion engine E3. Thus, it becomes possible to supply load power corresponding to the maximum capacity of each alternator Gl, G2, and G3.

When reducing the load power, the load power H is lower than the load power Fl 3 , H4 in order to prevent the internal combustion engines E2 and E3 from starting and stopping (frequently repeated).
5. In H6, internal combustion engine E2. E: Controlled to stop at 3i.

Centrifugal fluid machine Ll, L2. L31d, used for example for air conditioning. Instead of setting the above-mentioned predetermined time T, the temperature of the air-conditioned room may be used as another embodiment of the present invention. For example, one shot η
1゛□The difference between the frequency and the predetermined frequency range is greater than a predetermined value, and the temperature of the room where the air is being moderated exceeds the predetermined temperature difference during cooling. When the vehicle rises, the remaining internal combustion engine may be started.

Effects As described above, according to the present invention, when the load power increases, the rotational speed of the internal combustion engine is reduced so that the power capacity of the AC valve 5 @ gutter is close to the load power, and the power is applied to exceed the load power. This allows the alternator to operate near its maximum allowable output, improving thermal efficiency. When the difference between the current generation frequency and the predetermined frequency continues to exceed a predetermined value for a predetermined period of time, the remaining internal combustion engine is started and a new AI alternation is started.
Since the flow distribution machines are operated in parallel, the power generation frequency cannot be maintained at a low level.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an embodiment of the present invention, Figure 2 is a diagram for explaining the operation shown in Figure 1, Figure 3 is a block diagram of the prior art, and Figure 4 is a block diagram of an embodiment of the present invention. 0 is a diagram for explaining the operation of the prior art shown in FIG. 3. 2... Processing circuit, 6... Power line, 7... Power generation frequency detector, 8... Wattmeter, ”[(1,E2.E3
...Internal combustion engine, G1, G2, G3-9
Flow B'rW machine, vl, v2, ■3... Throttle valve, SL, S2.83... Speed/reaction adjuster, Wl, W2.
W3...Switch, Ml.

Claims (1)

[Claims] Each of the plurality of internal combustion engines rotates an alternating current generator individually corresponding to the internal combustion engine, and the motor is energized by the electric power from the alternating current generator, and the motor is a centrifugal fluid machine. When the load power exceeds a predetermined value corresponding to the frequency of a certain operating alternator, the rotational speed of the operating internal combustion engine is reduced to reduce the power capacity of the alternator. is close to the load power and exceeds the load power, and when the difference between the current generation frequency and the predetermined frequency remains at or above the predetermined value for a predetermined time, the remaining internal combustion engine A method for controlling the number of generators, which is characterized by starting.