JP2006158159A - Control device to use emergency generator at normal service operation mode and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device to use an emergency generator at a normal service operation mode, and to provide its control method. <P>SOLUTION: The control device includes a load 300 having a disaster preventive load 306 and a general load 308, an electric power company 100 connected to the load 300 through a switch SW 1, a normal service generator 202 connected to the load 300 through a switch SW 2, the emergency generator 204 connected to the load 300 through a switch SW 3, a switch SW 4 which connects the normal service generator 202 and the emergency generator 204, a switch SW 5 provided between the disaster preventive load 306 and the switch SW 1, a cross current compensating unit 206 to synchronize phases of outputs from the normal service generator 202 and the emergency generator 204, pickup sensors P1, P2, P3 to detect output states of the electric power company 100, the normal service generator 202 and the emergency generator 204, and an integrated control unit 400. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a normal operation control device for an emergency generator and a control method thereof, and in particular, has been devised so that the emergency power generator can be used effectively.

An emergency generator is a facility that generates electricity by itself and supplies power when the power supply from the power plant is stopped due to an accident or disaster. Generally, an emergency generator is obliged to be installed in a building where a public of 1000 m ² or more enters and exits as a power source for a fire extinguishing facility in the event of a power failure. Although it is not allowed to use emergency generators for regular power generation, in recent years it has been recognized as an emergency generator by installing two regular generators and having the function as an emergency generator. Became. Rather than installing emergency generators that are not normally used, installing two regular generators that are used on a daily basis results in faster return on investment and contributing to energy savings. For this reason, there are increasing cases of applying for two emergency generators as emergency generators.

  On the other hand, the number of emergency generators installed in Japan is about 142,000, and the power generation capacity is 18 million kW. This means that power equivalent to about 10% of the total domestic power generation capacity is not used. Moreover, since emergency generators are not used on a daily basis, about 40% of them do not start in an emergency or stop immediately after being started.

Conventionally, an emergency generator has been proposed that always measures the discharge current of the battery to prevent the battery life from being shortened by controlling the charge current to the same amount as the discharge current, and to start up reliably in an emergency. . (See Patent Document 1)
JP-A-10-285824

  However, adding the function of a regular generator to an existing emergency generator and having both emergency and regular use has the following problems.

  The emergency generator is originally operated when the power supply from the power company is stopped and supplies power to the fire extinguishing equipment and the like, so it is an independent operation type and not a grid interconnection operation type. Also, emergency generators are not allowed to be used without type approval for engines, generators, batteries, etc. Modifying the generator for this is costly and time consuming. Since the operation time of the emergency generator should be maintained for 2 hours in an emergency, the fuel tank is built-in with a capacity of 2 hours, so it is difficult to use as a regular use. Similarly, lubricating oil tanks are not normally installed.

  The present invention was made in view of the above problems, and an emergency generator normal operation control device with an improved control method so that an emergency generator can be used as a regular service, It is an object to provide a control method thereof.

  The control device for emergency and utility generators according to an aspect of the present invention includes a load unit including a disaster prevention load and a general load, a commercial power source connected to the load unit via a first switch, and the load A normal generator connected to the part via a second switch, an emergency generator connected to the load part via a third switch, a first connecting the normal generator and the emergency generator 4 switches, a fifth switch provided between the disaster prevention load and the first switch, a cross-current compensator for phase-synchronizing the outputs of the utility generator and the emergency generator, the commercial power supply, A first pickup sensor for detecting an output state of the generator, the emergency generator, and a third pickup sensor; and an integrated control unit, wherein the integrated control unit has the first switch on, the second switch, When the third switch is off, the first pin Upon detection of a power failure via a click-up sensor, said launch emergency generators, turns off said first switch and the fifth switch comprises means for turning on the third switch.

  According to the present invention, there are provided a control device for an emergency generator and a utility generator with an improved control method so that the emergency generator can be used for regular use, and a control method therefor. Since the normal generator and the emergency generator are controlled to operate in an interconnected manner, effective use of the emergency generator can be realized.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an outline of a control device for emergency and utility generators according to an embodiment of the present invention used as a power supply device. As shown in FIG. 1, an output line from an electric power company 100 serving as a commercial power source is connected to a load unit 300 via a switch 1. An output line from the private power generation unit 200 is further connected to the load unit 300. The private power generation unit 200 is controlled by the integrated control unit 400.

  The load unit 300 includes a disaster prevention load 306 and a general load 308. The disaster prevention load 306 is connected to the output lines of the electric power company 100 and the private power generation unit 200 via the transformer 302. The general load 308 is connected to the output lines of the electric power company 100 and the private power generation unit 200 via the transformer 304 and the switch SW5. Here, the disaster prevention load is, for example, a load facility and a load facility that require continuous power supply in an emergency such as a fire extinguishing facility or a hospital operating room. On the other hand, the general load 308 is a load facility and load equipment other than the disaster prevention load.

  The private power generation unit 200 includes a service generator 202, an emergency generator 204, and a cross current compensator 206 connected between the service generator 202 and the emergency generator 204. The cross current compensator 206 is a voltage that prevents current from flowing between the normal power generator 202 and the emergency power generator 204 during parallel operation of the normal power generator 202 and the emergency power generator 204 (so that the cross current is zero). , Control the frequency and phase. When the cross current compensator 206 performs the above control, the service generator 202 and the emergency generator 204 operate together.

  As a result, the outputs of the service generator 202 and the emergency generator 204 are supplied to the load unit 300 as the output of the private power generation unit 200 without being offset.

  The output lines of the normal generator 202 and the emergency generator 204 are connected to the load unit 300 as the output lines of the private power generation unit 200 via the switches SW2 and SW3, respectively.

  The regular generator 202 and the emergency generator 204 share the fuel tank 210. Therefore, the emergency generator 204 includes a fuel filter corresponding to the fuel used for the regular generator 202. Since the fuel tank 210 is for a regular generator, it can be operated continuously for about 1 week to 10 days even if the fuel supply is interrupted.

  Pickup sensors P1, P2, and P3 are attached to the output lines of the electric power company 100, the regular generator 202, and the emergency generator 204, respectively. The pickup sensors P1, P2, and P3 detect the voltage, frequency, and phase of the AC signal. Detection signals from the pickup sensors P1, P2, and P3 are input to the integrated control unit 400.

  The power consumption of the disaster prevention load 306 and the general load 308 is measured by the power consumption measuring device 402, and the measurement data is input to the integrated control unit 400.

  The integrated control unit 400 controls the voltage, frequency, and phase of the output of the common power generator 202 according to the power consumption input from the power consumption measuring device 402. Further, on / off control of the switches SW1 to SW6 is performed under predetermined conditions depending on the activation states of the regular power generator 202 and the emergency generator 204.

  The integrated control unit 400 is also provided with a control signal from the isolated operation detection device 406 and operation information from the timer 404. When various settings are made, an output of an operation unit (not shown) for giving the setting information is also given to the integrated control unit 400.

  The isolated operation detection device 406 detects an increase in impedance of the power system from the load side, and detects that it is in a power failure state. At this time, the isolated operation detection device 406 transmits a control signal to the integrated control unit 400, and the integrated control unit 400 controls the switch SW1 to be turned off so that the independent power generation unit 200 operates independently.

  FIG. 2 is a flowchart illustrating an embodiment of the operation of the integrated control unit 400 that controls the above-described power supply apparatus.

  Now, the load unit 300 is supplied with electric power from the electric power company 100 with the switch SW1 and the switch SW5 closed. In this state, when the integrated control unit 400 detects a power failure based on the output voltage, frequency, and phase data of the power company 100 detected by the pickup sensor P1 (step A1), the integrated control unit 400 causes the emergency generator 204 to operate. Start (step A2). The integrated control unit 400 detects the voltage and frequency data of the output of the emergency power generator 204 by the pickup sensor P3 (step A3), and establishes the output of the emergency generator 204.

  Here, it is determined again whether or not a power failure continues from each data of the output of the electric power company 100 detected by the pickup sensor P1 (step A4). If power is restored at this time, the emergency power generator 204 is stopped (step A5), and this flow is terminated. If the power failure continues, the switches SW1 and SW5 are opened (step A6). When it is confirmed that the switch SW1 and the switch SW5 are opened, the switch SW3 is closed (step A7). As a result, the output power of the emergency generator 204 is supplied to the disaster prevention load 302.

  Subsequently, the integrated control unit 400 activates the service generator 202 (step A8). The pickup sensor P2 and the pickup sensor P3 detect the voltage, frequency, and phase of the output of the utility generator 202 and the output of the emergency generator 204 (step A9), and the integrated control unit 400 outputs the output of the utility generator 202. And the output of the emergency generator 204 are synchronized (step A10). When the output of the normal generator 202 and the output of the emergency generator 204 are synchronized (step A11), the switch SW2, the switch SW4, and the switch SW6 are closed (step A12). From the above, the normal generator 202 and the emergency generator 204 are operated in parallel (step A13), and power is supplied to both the disaster prevention load 306 and the general load 308.

  When the power recovery of the electric power company 100 is detected by the pickup sensor P1 (step A15), the output data of the service generator 202 is detected by the pickup sensor P2 (step A15), and the electric power company 100 detected by the pickup sensor P1 is detected. (Step A16). When the outputs of the utility generator 202 and the emergency generator 204 (the emergency generator 204 generates power in parallel with the utility generator 202 by the cross current compensation device 206) and the power company 100 are synchronized (step A17). Then, the switch SW1 is closed (step A18), and the interconnection operation between the electric power company 100 and the private power generation unit 200 is performed (step A19).

  At this time, if the emergency generator 204 is not activated due to a failure or the like in step A2, the service generator 202 is activated as an alternative, and the switch SW2 is closed instead of closing the switch SW3. Since the normal generator 202 and the emergency generator 204 are not operated in parallel, the switch SW5 is kept open and power is supplied only to the disaster prevention load 306.

  FIG. 3 shows a flowchart for explaining the second embodiment of the operation of the integrated control unit 400. Now, with the switch SW1, the switch SW2, and the switch SW5 closed, the load unit 300 is supplied with power from the power company 100 and the utility generator 202.

  At this time, when the isolated operation detection device 406 detects a power failure (step B1), the integrated control unit 400 opens the switch SW1 and the switch SW5 (step B2). In this state, the regular generator 202 supplies power to the disaster prevention load 306 (Step B3). Subsequently, the integrated control unit 400 activates the emergency generator 204 (step B4). Here, the voltage, frequency, and phase of the output of the emergency generator 204 are detected by the pickup sensor P2 and the pickup sensor P3 (step B5), and the voltage, frequency, and phase of the output of the utility generator 202 are used for emergency power generation. Set to the machine 204 (step B6). When the normal generator 202 and the emergency generator 204 are synchronized (step B7), the switch SW3, the switch SW5, and the switch SW6 are closed (step B8). As a result, the regular generator 202 and the emergency generator 204 are operated in parallel (step B9), and power is supplied to the disaster prevention load 306 and the general load 308.

  At this time, when it is detected that the pickup sensor P1 has recovered power (step B10), the pickup sensor P2 synchronizes the output of the utility generator 202 and the output of the power company 100 (step B11). When the output of the electric power company 100 and the output of the utility generator 202 are synchronized (step B12), the switch SW1 is closed (step B13), and the interconnection operation between the electric power company 100 and the private power generation unit 200 is performed (step B12). B14).

  In the above embodiment, when the emergency generator 204 is not started in step B4 due to a failure or the like, the service generator 202 and the emergency generator 204 are not operated in parallel, so the switch SW5 is left open. The power is supplied only to the disaster prevention load 306.

  FIG. 4 shows a flowchart for explaining the third embodiment of the operation of the integrated control unit 400. Now, with the switch SW1, the switch SW2, the switch SW3, and the switch SW5 closed, the load unit 300 is supplied with power from the power company 100, the utility generator 202, and the emergency generator 204.

  At this time, when the isolated operation detection device 406 detects a power failure (step C1), the integrated control unit 400 opens the switch SW1 (step C2). In this state, the service generator 202 and the emergency generator 204 are operated in parallel (step C3), and power is supplied to the disaster prevention load 306 and the general load 308.

  Here, when it is detected that the pickup sensor P1 has recovered power (step C4), the voltage, frequency, and phase of the service generator 202 are detected by the pickup sensor P2 (step C5). The integrated control unit 400 synchronizes the output of the utility generator 202 and the output of the electric power company 100 (step C7), and closes the switch SW1 when the synchronization is achieved (step C8), and the electric power company 100 and the private power generation unit 200. (Step C9).

  FIG. 5 shows a flowchart for explaining the fourth embodiment of the operation of the integrated control unit 400. Here, the emergency generator 204 is used as a regular generator. Now, the load unit 300 is supplied with electric power from the electric power company 100 with the switches SW1 and SW5 closed.

  At this time, the power consumption measuring device 402 measures the power consumption amount of the load unit 300 (step D1), and when the power consumption amount in the load unit 300 exceeds a set value (step D2), the integrated control unit 400 The power generator 204 and the service generator 202 are activated (step D3). Here, the voltage, frequency, and phase of the outputs of the regular generator 202 and the emergency generator 204 are detected by the pickup sensor P2 and the pickup sensor P3 (step D4). The output of the service generator 202 is synchronized with the emergency generator 204 by matching the voltage, frequency, and phase (step D5). When the outputs of the common generator 202 and the emergency generator 204 are synchronized (step D6), the switch SW4 and the switch SW6 are closed (step D7), and the common generator 202 and the emergency generator 204 are connected in parallel. Operation is set (step D8). Next, the voltage, frequency, and phase of the output from the electric power company 100 are detected by the pickup sensor P1 (step D9). The integrated control unit 400 synchronizes the voltage, frequency, and phase of the output of the utility generator 202 with the electric power company 100 (step D10). When synchronization is established (step D11), the switch SW2 is closed (step D12). From this, it is set as the interconnection operation | movement with the electric power company 100 and the private power generation part 200 (step D13). At this time, the emergency generator 204 is integrated with the service generator 202 in parallel operation by the cross current compensating device 206. Thereby, the emergency generator 204 is connected to the electric power company 100.

  In the above embodiment, in order to use the emergency generator 204 for regular use, the power generator 100 and the regular generator 206 are connected to the power generator 100 and the limiter is applied so that the power generation capacity of the emergency generator 204 is reduced. Change to about 80% of the rating. When the emergency generator 204 is used for emergency, the limiter is released and power is generated with the rating of the emergency generator 204.

  As described above, in the present invention, the emergency generator 204 is connected to the regular fuel tank 210 to enable the emergency generator 204 to be used as a regular generator. The power generator is connected to the service generator 202 and outputs ½ power synchronized with the output of the service generator 202. Therefore, the emergency generator 204 can be connected to the power company 100 without modifying the power generation board, and can be operated for a long time because it is connected to the regular fuel tank 210. . From this, according to this invention, the electric power supply apparatus which can be used even if the existing emergency generator is used regularly, and its control method can be provided.

The figure which shows the outline of the electric power supply apparatus which concerns on one Embodiment of this invention. The flowchart explaining 1st Embodiment of the control method of the electric power supply apparatus shown in FIG. The flowchart explaining 2nd Embodiment of the control method of the electric power supply apparatus shown in FIG. The flowchart explaining 3rd Embodiment of the control method of the electric power supply apparatus shown in FIG. The flowchart explaining 4th Embodiment of the control method of the electric power supply apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Electric power company, 200 ... Private power generation part, 202 ... Common use generator, 204 ... Emergency generator, 206 ... Cross current compensation apparatus, 208 ... Lubricating oil tank, 210 ... Fuel tank, 300 ... Load part, 302, 304 ... Transformer, 306 ... Disaster prevention load, 308 ... General load, 400 ... Integrated control unit, 402 ... Power consumption measuring device, 404 ... Timer, 406 ... Single operation detection device, P1-P3 ... Pick-up sensor, SW1-SW6 ... Switch

Claims (3)

A load section having a disaster prevention load and a general load;
A commercial power source connected to the load unit via a first switch;
A service generator connected to the load section via a second switch;
An emergency generator connected to the load section via a third switch;
A fourth switch connecting the output terminal of the utility generator and the output terminal of the emergency generator;
A fifth switch provided between the disaster prevention load and the first switch;
A cross current compensator for phase-synchronizing the outputs of the utility generator and the emergency generator;
First, second, and third pickup sensors that detect the output state of the commercial power source, the utility generator, and the emergency generator;
An integrated control unit,
The integrated control unit activates the emergency generator when the first switch is on, the second switch and the third switch are off, and when a power failure is detected via the first pickup sensor, An emergency generator control device comprising means for turning off the first switch and the fifth switch and turning on the third switch. A load section having a disaster prevention load and a general load;
A commercial power source connected to the load unit via a first switch;
A service generator connected to the load section via a second switch;
An emergency generator connected to the load section via a third switch;
A fourth switch connecting the output terminal of the utility generator and the output terminal of the emergency generator;
A fifth switch provided between the disaster prevention load and the first switch;
A cross current compensator for phase-synchronizing the outputs of the utility generator and the emergency generator;
First, second, and third pickup sensors that detect the output state of the commercial power source, the utility generator, and the emergency generator;
An integrated control unit,
When the first, second, and fifth switches are on, and the load unit is operating with outputs from the commercial power source and the utility generator,
The control device for the regular generator that turns off the first switch and the fifth switch when a power failure of the commercial power source is detected by an isolated operation detection device. A load section having a disaster prevention load and a general load;
A commercial power source connected to the load unit via a first switch;
A service generator connected to the load section via a second switch;
An emergency generator connected to the load section via a third switch;
A fourth switch connecting the output terminal of the utility generator and the output terminal of the emergency generator;
A fifth switch provided between the disaster prevention load and the first switch;
A cross current compensator for phase-synchronizing the outputs of the utility generator and the emergency generator;
First, second, and third pickup sensors that detect the output state of the commercial power source, the utility generator, and the emergency generator;
An integrated control unit,
In the integrated control unit, the first, second, third, and fifth switches are turned on, and the load unit is operated with outputs from the commercial power source, the utility generator, and the emergency generator. When
Means for supplying power to the load section while turning off the first switch and maintaining synchronization between the utility generator and the emergency generator when the isolated operation detection device detects a power failure of the commercial power supply; Control device for emergency and service generators.

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