KR19990061968A - Power supply control method of generator - Google Patents

Abstract

The present invention relates to a power supply control method of a generator, and more particularly, to a power supply control method of a generator for supplying / stopping power to a load by interlocking generators when the load requirement is more than a predetermined value. In the generator power supply control method of the present invention, a commercial power supply step of supplying commercial power to a load, measuring a load usage currently used, and a load requirement for detecting an increase in the load requirement if the measured load usage is more than a predetermined reference set value. Detecting step, if the generator start step for starting the generators according to the detected load requirement increase width to start the generators in a predetermined operation order and the load requirement is less than the predetermined reference set value, the generators started in the preset generator stop sequence A generator stop step of stopping the operation operation. Therefore, the present invention can provide a stable power supply by setting a constant supply amount of commercial power, and controlling a plurality of generators so as not to exceed a certain ratio of the commercial power supply to the total load.

Description

Power supply control method of generator

The present invention relates to a power supply control method for a generator, and more particularly, to a power supply control method for a generator for driving and stopping a plurality of generators with a start delay time according to an increase in the amount of load increase exceeding a commercial load. .

Conventionally, several generators have been designed for emergency use, not always, and used for commercial power use in case of power failure, and are designed mainly for the alternative operation as a design considering only the size of the load or the amount of power used. Therefore, the conventional power control system has a problem in that the linkage operation between commercial power supplies and the efficient load distribution between each generator are not performed well.

Accordingly, an object of the present invention is to provide a power supply control method of a generator that detects the load consumption of generators connected in parallel to a commercial power source and stably drives / stops the generator with an appropriate starting delay time according to the increase in load consumption. Is in.

1 is a configuration diagram of a power supply control system of a generator according to an embodiment of the present invention;

2 is a flowchart illustrating a starting operation of generators;

3 is a flowchart illustrating a stop operation of generators.

※ Explanation of codes for main parts of drawing

10: commercial power supply unit 16, 26, 36: breaker

11, 21, 31: control panel 12, 22, 32: protective relay

13 Sync Controller 14 Controller

15: setter 20, 30: generator

24, 34: controller 40: load

A characteristic of the present invention for achieving the above object is in the power supply control method for adjusting the load requirements by interlocking different power sources, the commercial power supply step of supplying commercial power to the load, the current load usage If the measured load usage is more than the preset reference set value, the load requirement detecting step of detecting an increase in the load demand amount, and a generator start time for starting the generators in a predetermined operation sequence by setting a start delay time according to the detected load demand increase amount. When the step and the load requirement is less than the predetermined reference set value, the power supply control method of the generator comprising a generator stop step of stopping the operation operation of the generators started in the preset generator stop sequence.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a generator power supply control system of the present invention. The commercial power supply unit 10 supplies power to the load 40. The dark line on the drawing is a power line. In addition, the generators 20, 30, ... are connected in parallel with the commercial power supply 10. When the power consumption of the load 40 becomes more than a predetermined commercial power supply amount, the generators 20, 30,..., At least one of the generators 20 simultaneously operate in conjunction with the commercial power supply unit 10 to supply power to the load 40. Supply. In addition, the commercial power supply 10 and the generators 20, 30, ... are connected to the load 40 through breakers 16, 26, 36, ..., respectively. The synchronous control panel 11 is connected to the commercial power supply unit 10, and the power control panels 21, 31,... Are also connected to the generators 20, 30,. The synchronous control panel 11 includes a controller 14 for receiving a signal such as voltage and current supplied from a commercial power supply unit 10, checking load usage, and controlling speed and load. The synchronization detector 13 determines whether the phases of the commercial power supply and the generator power supply are synchronized, and outputs a synchronization abnormality signal to the controller 14. In addition, the commercial power supply unit 10 is provided with a protection relay 12 to prevent the reverse transmission of power. The setter 15 is a user interface device capable of inputting setting values necessary for the program operation of the controller 14 in order to operate the commercial power supply unit 10 and the generators 20, 30,.

Power generators 21, 31,... Are connected to each of the generators 20, 30,... In FIG. 1, only the first generator 20 and the second generator 30 are illustrated, but in addition, a plurality of generators may be connected to each other in order to operate the linkage. The first power supply control unit 21 connected to the first generator 20 is connected to the first controller 24 and the protection relay 22 that exchange signals with the controller 14 according to a signal output from the first generator 20. Is done. Since the second generator 30 is also the same as the configuration of the first generator 20, description thereof will be omitted.

2 is a flowchart illustrating a method of connecting and operating the commercial power supply unit 10 and the first generator 20. With reference to Figure 2 will be described a power supply control method of a generator configured as described above.

First, when the power system operates, commercial power is input from the commercial power supply unit 10 to the load 40 (step 201). In addition, commercial power is supplied to the first generator 20. Therefore, the first generator 20 waits for the normal starting (step 202). The controller 14 stores the reference power requirement of the load 40 in advance. In addition, the controller 14 may receive the load requirement input from the setting unit 15 and change the reference power requirement. The controller 14 compares the load demand amount required by the current load 40 with the power consumption amount and a predetermined set value to determine whether the load demand amount required by the current load 40 has increased (step 203). If the load requirement is not increased but is constant, step 203 is repeated. However, if the load demand increases, the controller 14 outputs a control signal for starting the first generator 20 at the predetermined reference speed to the first controller 24. The first controller 24 starts the first generator 20 with the reference start delay time t1 (step 204). Here, the preset reference start delay time is a delay time for starting a general generator, and generally refers to a speed required for low speed start. Subsequently, the controller 14 determines whether the increase in the load demand amount is greater than or equal to the preset value (step 205). The controller 14 outputs a control signal for starting the first generator 20 with a start delay time t2 earlier than the reference start delay time t1 if the increase in the load requirement amount is equal to or greater than a preset value. Will output The first controller 24 starts the first generator 20 with a quick start delay time. However, if the increase in the load demand amount is not more than the preset value, the flow proceeds to step 207. Then, the controller 14 determines whether the preset start time of the first generator 20 has passed (step 207). If the preset start time has passed, the synchronous verifier 13 verifies whether the synchronization is achieved by verifying the power of the commercial power source and the first generator 20 (step 208). If the synchronization is completed without any abnormality, the first controller 21 turns on the circuit breaker 26 to supply the power of the first generator 20 to the load 40 (step 210). However, if synchronization is not achieved, an alarm informing of this is generated (step 209). The controller 14 outputs a power adjustment control signal of the first generator 20 to the first controller 21 so as to share power with the commercial power supply unit 10. The first generator 20 supplies the adjusted power to the load 40 under the control of the first controller 21 (step 211).

Until now, the process of supplying the load 40 by sharing the power of the commercial power supply and the first generator 20 has been described. When the load requirement of the load 40 is more than the power supply of the commercial power source and the first generator 20, the second generator 30 also participates in the power supply. The power supply operation of the second generator 30 is performed by performing steps 202 to 211 shown in FIG. 2 (step 300). Therefore, the load 40 is supplied with commercial power and the power from the first generator 20 and the second generator 30. Here, commercial power is always supplied to the load 40 constantly. Therefore, the first generator 20 and the second generator 30 share the remaining load requirements by subtracting the load requirements from the power supply unit 10. In addition to the above-described generator startup process it is possible to link the commercial power source and a plurality of generators.

3 is a flowchart illustrating a generator stop operation according to an embodiment of the present invention. In the case where the commercial power supply unit 10, the first generator 20, and the second generator 30 are linked with each other and the load requirement starts to fall below the set value, the second generator 20 must be stopped with reference to FIG. I will explain.

The controller 14 detects the required amount of the load 40 while the commercial power supply unit 10, the first generator 20, and the second generator 30 share the power to supply power to the load 40. (Step 301). The controller 14 compares the required amount of the detected load 40 with a preset set value (step 320) and calculates a load requirement shared by the second generator 30 when the load requirement is less than the preset value. Transfer to step 20 (step 303). When the transfer of the load requirement is completed, the second controller 34 turns on the circuit breaker 36 connected to the second generator 30 (step 304). The second generator 30 stops after a predetermined delay time for cooling (step 305). Therefore, the load 40 is now operated by power sharing between the commercial power supply 10 and the first generator 20.

In FIG. 3, the process of reducing the load requirement to transfer the load sharing amount of the second generator 30 to the first generator 20 has been described. In this way, even when the load sharing amount is further reduced so that the power supply of the first generator 20 is not necessary, the load amount to the commercial power supply unit 10 is performed by performing steps 301 to 305 as described above (step 400). This is transmitted, and the required amount of the load 40 can be satisfied only through the commercial power source.

Accordingly, the present invention relates to a method of controlling the generator to be operated in parallel with a commercial power source when a plurality of generators are connected to each other. Stable power can be supplied by not exceeding a certain ratio.

Claims (5)

In the power supply control method for adjusting the load requirements by operating the different power supply in conjunction, A commercial power supply step of supplying commercial power to a load; A load requirement detecting step of measuring a load usage currently used and detecting an increase in the load requirement if the measured load usage amount is equal to or greater than a preset reference set value; A generator startup step of starting generators in a predetermined operation order by providing a startup delay time according to the detected load requirement increase width; And And a generator stopping step of stopping a driving operation of the generators started in a preset generator stop sequence when the load requirement is less than a predetermined reference set value. The method of claim 1, wherein the start delay time according to the increase in the load demand amount is set to high speed / low speed according to a reference power data value preset in the control device. The method of claim 1, wherein the start delay time according to the increase in the load demand amount is set to high speed / low speed according to a reference power data value input by a user through an external key input device. The generator according to claim 2 or 3, wherein the start of the generator starts low speed on the basis of the low speed start delay time, and when the increase in the load requirement increases at a low speed start or more, the generator is provided with a high speed start delay time. Power supply control method for a generator, characterized in that to start at a high speed. The method of claim 1, wherein the step of stopping the generator is characterized in that, when the generator is stopped by a predetermined stop sequence, the load requirement is transmitted to the remaining generators within a range that does not affect the operation of the other generators. Power supply control method of generator.