JP2021170911A - Recovery operation method from service interruption and recovery operation device - Google Patents

Abstract

To suggest a recovery operation method for performing early recovery from service interruption while maintaining power quality in consideration of load characteristics to be a problem on the power quality and a voltage adjustment function of a private power generator.SOLUTION: A recovery operation method from service interruption performs an automatic recovery operation to suppress voltage fluctuation of a power system of a power supply object facility according to characteristics of plant loads, an operation condition and a start propriety condition of a private power generator in automatic recovery from full service interruption in the full service interruption of the power system of the power supply object facility which supplies power to a plurality of plant loads by cooperation of the private power generator with a main system of an electric power company in normal time.SELECTED DRAWING: Figure 2B

Description

The present invention relates to an operation method and an operation device for promptly recovering from a power failure when the power system in a power supply target facility such as a steel mill has a total power failure.

For example, a method disclosed in Patent Document 1 is known as an operation method for promptly recovering from a power failure when the power system in the power supply target facility has a total power failure. Considering the presence or absence of a single thermal generator that is not electrically connected to the upper bus in the sound facility in the power system of the power supply target facility, if there is a single thermal generator, it is ranked higher. By electrically connecting to the grid bus, we have obtained a new recovery target grid with increased support power.

Japanese Unexamined Patent Publication No. 06-205536

However, in the case of this conventional operation method, since it is not possible to grasp the status of the factory load such as the hot-rolling factory in the power system in the power supply target facility such as the steel mill, it is accidentally restored too early and the load fluctuates. The accompanying voltage fluctuations may increase, causing problems in the power quality of the power system. In some cases, excessive voltage fluctuations may cause insulation damage to load equipment, resulting in secondary disasters due to equipment damage. Is also a concern.

Therefore, the subject of the present invention is to promptly recover from a power failure while maintaining the power quality according to the state and characteristics of the power system in consideration of the load characteristics and the voltage adjustment function of the private generator, which are problems in power quality. The purpose is to propose a recovery operation method and a recovery operation device to be performed.

The recovery operation method from a power failure of the present invention that advantageously solves the above problems is
Normally, when a private power generator is connected to the main system of an electric power company to supply power to multiple factory loads, when the power system of the power supply target facility is completely out of power, it automatically recovers from the total power outage.
The voltage fluctuation of the power system of the power supply target facility is suppressed according to the characteristics such as the voltage fluctuation of the factory load due to the arrangement and connection in the power system of the power supply target facility, and the operating status and startability status of the private generator. It is characterized by performing an automatic recovery operation as described above.

In the recovery operation method from a power failure of the present invention, the upper bus that connects the primary side of the upper substation equipment to the main system of the electric power company becomes no voltage, so that the entire electric power system of the power supply target facility becomes full. In the event of a power outage
First, as a total power failure opening operation, a circuit breaker on the secondary side of the upper substation equipment, a circuit breaker on the secondary side of the lower substation equipment in which the primary side is connected to the secondary side of the upper substation equipment, and the circuit breaker on the upper side. The circuit breaker of the transmission line of the private power generator to the lower bus connected to the secondary side of the substation or the secondary side of the lower substation, and the cutoff of the distribution line for each factory load from the lower bus. Automatically open the vessel,
Next, waiting for the restoration of the main system of the electric power company, while monitoring the voltage of the upper bus and the lower bus and the power flow flowing through each circuit breaker, from the upper side of the power system of the power supply target facility. It is preferable that the circuit breakers are automatically turned on in sequence toward the lower level to perform an automatic restoration operation of the power system of the power supply target facility.

Further, in the recovery operation method from a power failure of the present invention, the recovery of the private generator contributes to the suppression of the voltage fluctuation of the power system of the power supply target facility when the load of each factory is connected. It is preferable to give priority to the automatic restoration operation of the factory load in which the by-product gas that is the fuel necessary for the restoration of the private power generator is generated among the factory loads.

Further, in the recovery operation method from a power failure of the present invention, in the recovery operation of the private power generator, the recovery operation is performed.
First, the auxiliary machinery necessary for starting the private power generator is restored.
When the auxiliary machines are restored and ready to be started, it is preferable to perform the start operation and the restoration operation of the private power generator.

Further, in the recovery operation method from a power failure of the present invention, in the recovery operation of the plurality of factory loads, the recovery operation is performed.
It is preferable to perform the restoration operation so as to suppress the voltage fluctuation due to the connection of each factory load and the voltage fluctuation of the power system of the power supply target facility according to the voltage adjustment function of the private power generator.

Further, in the recovery operation method from a power failure of the present invention, the voltage fluctuation of the power system of the power supply target facility is suppressed in advance according to the characteristics of each factory load and the operating status and startability status of the private power generator. It is preferable to perform the restoration operation of the private power generator and the plurality of factory loads according to the recovery order table that defines the recovery order of the private power generator and the factory load.

Further, the recovery operation device from a power failure of the present invention that advantageously solves the above problems is
Normally, it is a recovery operation device for automatically recovering from a total power failure of the power system of the power supply target facility where a private power generator is connected to the main system of the power company to supply power to multiple factory loads.
A system information input unit for inputting information indicating the current state of the power system of the power supply target facility including the operation status and startability status of the private power generator, and
Of the plurality of factory loads, the factory load that generates by-product gas as fuel necessary for the restoration of the private power generator is prioritized, and the private power generator is suppressed so as to suppress voltage fluctuations in the power system of the power supply target facility. And the recovery order setting unit that sets the recovery order table that defines the recovery order of the multiple factory loads,
A recovery order changing unit that changes the recovery order of the private power generator and the plurality of factory loads read from the recovery order table so as to suppress voltage fluctuations of the power system based on the current state of the power system.
Based on the recovery order of the private power generator and the plurality of factory loads read from the recovery order table, it is judged that there is no problem in power quality, and the transmission line of the private power generator and the distribution line for each factory load. Control signal output unit that outputs the open / close control signal to the breaker
It is characterized by having.

According to the recovery operation method from a power failure of the present invention, a total power failure occurs when the power system of the power supply target facility that normally supplies power to a plurality of factory loads by connecting a private generator to the main system of the power company. When automatically recovering from, the power of the power supply target facility depends on the characteristics of the factory load, such as voltage fluctuation due to the arrangement and connection in the power system of the power supply target facility, and the operating status and startability status of the private generator. Since the automatic recovery operation is performed so as to suppress the voltage fluctuation of the system, early recovery from a power failure should be performed while maintaining the power quality in consideration of the load characteristics that pose a problem in power quality and the voltage adjustment function of the private generator. Can be done.

Further, according to the recovery operation device from a power failure of the present invention, the system information input unit inputs information indicating the current state of the power system of the power supply target facility including the operation status and startability status of the private generator. Then, the restoration order setting unit sets a restoration order table that defines the restoration order of the private generator and the plurality of factory loads so as to suppress voltage fluctuations in the power system of the power supply target facility, and the restoration order changing unit sets the restoration order table. , The recovery order of the private generator and the plurality of factory loads read from the recovery order table is changed so as to suppress the voltage fluctuation of the power system based on the current state of the power system, and the control signal output unit. Outputs an open / close control signal to the power transmission line of the private generator and the breaker of the distribution line for each factory load based on the recovery order of the private generator and the plurality of factory loads read from the recovery order table. Therefore, it is possible to perform early recovery from a power failure while maintaining the power quality in consideration of the load characteristics that pose a problem in power quality and the voltage adjustment function of the private generator.

It is a block diagram which shows the structure of the recovery operation apparatus from the power failure of one Embodiment of this invention. It is a flowchart which shows the first half part of the operation procedure of the recovery operation method from a power failure of one Embodiment of this invention executed by the recovery operation apparatus from the power failure of the said embodiment. It is a flowchart which shows the latter half part of the operation procedure of the recovery operation method from a power failure of one Embodiment of this invention executed by the recovery operation apparatus from the power failure of the said embodiment. It is explanatory drawing which shows the normal state of the electric power system of the power supply target facility which performs the restoration operation by the restoration operation apparatus and restoration operation method of the said embodiment. It is explanatory drawing which shows the state of independent maintenance at the time of the interconnection stop from the electric power company of the electric power system of the said power supply target facility. It is explanatory drawing which shows the state at the time of the total power failure after the interconnection stop from the electric power company and the failure of maintenance of a single system, and the restoration order table of a private power generator and a factory load of the electric power system of the said power supply target facility. Explanatory diagram showing the initial state and the restoration order table of the private generator and the factory load in the restoration operation without the restoration from the electric power company and the private generator after the total power failure of the power system of the above power supply target facility. Is. It is explanatory drawing which shows the state at the time of turning on the secondary side circuit breaker of the upper substation equipment by the restoration operation (case 1) after the restoration operation, and the restoration order table of a private power generator and a factory load. It is explanatory drawing which shows the state at the time of the full restoration of the factory load after the circuit breaker was put in by the restoration operation (case 1) after the restoration operation, and the restoration order table of a private power generator and a factory load. After the restoration operation shown in Fig. 7 above, the restoration order table in which the state at the time of partial restoration of the factory load after the circuit breaker was turned on by the restoration operation (case 2) and the restoration priority of the private generator and the factory load were exchanged. It is explanatory drawing which shows. In the above restoration operation (Case 2), it is an explanatory diagram showing the state at the time of turning on the circuit breaker when the private power generator 1 can be started, and the recovery order table in which the recovery priorities of the private generator and the factory load are exchanged. be. In the above restoration operation (Case 2), the restoration order table in which the state at the time of partial restoration of the private generator 1 and the factory load after the circuit breaker was turned on by the restoration operation and the restoration priority of the private generator and the factory load are exchanged. It is explanatory drawing which shows. It is explanatory drawing which shows the state after the total restoration of a private power generator 1 and a factory load, and the recovery order table of a private power generator and a factory load in the said restoration operation (case 2).

FIG. 1 is a block diagram showing a configuration of a power failure recovery operation device according to an embodiment of the present invention. Normally, the power failure recovery operation device of this embodiment is used for private power generation in the main system of an electric power company. When the machines are connected to supply power to multiple factory loads such as a hot-rolled factory, for example, when there is a total power outage in the power system of a facility subject to power supply such as a steel mill, a recovery operation is performed to automatically recover from the total power outage. be.

The recovery operation device from a power failure of this embodiment is the current power system of the power supply target facility including the power flow flowing through each breaker and the bus voltage in addition to the operation (operation) status and startability status of the private generator. The system information input unit 1 for inputting the system information indicating the state, the system information display unit 2 for displaying the system information input by the system information input unit 1 on the screen, and the voltage fluctuation of the power system of the power supply target facility are suppressed. The recovery order setting unit 3 that sets the recovery order table that defines the recovery order of the private generator and the plurality of factory loads, and the recovery order of the private generator and the plurality of factory loads read from the recovery order table. The recovery order changing unit 4 that changes the current state of the power system based on the information of the current state of the power system input by the system information input unit 1 so as to suppress the voltage fluctuation of the power system, and the system information input unit 1 input the above. The control signal to the breaker of the distribution line for the bus is output based on the information on the current state of the power system, and the private generator and the private generators read from the recovery order table based on the recovery order of the plurality of factory loads. A data processing unit 6 having a control signal output unit 5 for outputting a control signal to a power transmission line of a generator and a breaker of the distribution line for each factory load is provided, and a power supply input by the system information input unit 1 is provided. Storage of information indicating the current state of the power system of the target facility, the recovery order table set by the recovery order setting unit 3, the private generator changed by the recovery order change unit 4, and the recovery order of multiple factory loads. It is equipped with a data storage unit 7 that moves in and out of the data processing unit 6, and specifically, for example, a normal computer having a central processing unit and a memory, and a terminal device such as a keyboard, a mouse, or a display device. It is composed of.

2A and 2B are flowcharts showing the first half and the second half of the operation procedure of the power failure recovery operation method of one embodiment of the present invention executed by the power failure recovery operation device of the above embodiment. , In step S1, a trouble such as a disconnection or a short circuit occurs on the power system of the power supply target facility, the interconnection line from the power company trips (automatically shuts off), the interconnection stops, and the power system of the power supply target facility. When is a single separation system, in step S2, it is first determined whether or not the single separation system can be maintained by power supply from the private power generator, and if it is not possible to maintain the single separation system, the power is generated in step S3. By opening the circuit breaker (breaker) that causes the system to have a total power outage, and repeatedly determining at predetermined time whether or not the independent separation system has been eliminated by relief (power supply) from the electric power company in step S4. Wait for the dissolution of the single separation system.

Then, in step S4, when it is determined that the independent separation system has been eliminated by the relief from the electric power company, the circuit breaker at the interconnection point from the electric power company is turned on in step S5, and then in step S6, the circuit breaker is turned on. Check the voltage of the circuit breaker on the secondary side (upper bus) of the circuit breaker at the interconnection point, and then in step S7, turn on the circuit breakers on the primary and secondary sides of the upper substation equipment, and then turn on the circuit breaker. It enables power supply to multiple factory loads that are directly connected to the secondary side bus (lower bus) of the secondary side circuit breaker or via lower substation equipment, and then in step S8, the private generator and multiple Refer to the recovery order table that defines the recovery order of factory load.

After that, in step S9, it is determined whether or not any of the private power generators can be restored, and one of the private power generators is supplied with by-product gas, which is the fuel required for restoration, from the related factory load and restored. If it is determined that it is possible (startable and operational), in step S10, the recovery priority of the private generator that has become recoverable is reflected in the recovery order table, and the recovery order read from the recovery order table is determined. The change is made and the process proceeds to step S11. On the other hand, if it is determined that none of the private power generators can be restored, step S10 is skipped and the process proceeds to step S11.

In step S11, the private generator or the factory load having the highest rank among the private generators and the factory loads without the recovery flag indicating that the recovery has been completed is selected in the recovery ranking table, and the load characteristics of the factory load and the voltage adjustment of the private generators are adjusted. In consideration of the function, it is determined whether or not the recovery is possible without any problem in terms of power quality. If the recovery is possible without any problem in terms of power quality, the process proceeds to step S12, and if there is a problem and the recovery is not possible, the process returns to step 9. .. Then, in step S12, the highest-ranked private power generator or factory load that can be recovered is restored, and the recovery flag is set for the private power generator or factory load in the recovery order table. In addition, when restoring the private power generator, at the same time, turn on the circuit breaker between the private power generator and the secondary bus (lower bus) to move from the private generator to the secondary bus. Enables power supply. In addition, when restoring the factory load connected to the secondary bus (lower bus) of the circuit breaker on the secondary side of the upper substation equipment via the lower substation equipment, 1 of the lower substation equipment first. The circuit breakers on the secondary side and the secondary side are turned on to enable power supply to the factory load. Then, in the following step S13, it is determined whether or not all of the private power generator and the plurality of factory loads have been restored, and it is determined that a part of the private power generator and the plurality of factory loads remains unrecovered. If this is the case, the process returns to step S9, and when it is determined that all of the private power generator and the loads of the plurality of factories have been restored, the operation is terminated.

FIG. 3 is an explanatory diagram showing a normal state of an example of the power system of the power supply target facility in which the recovery operation device and the recovery operation method of the above embodiment perform the recovery operation, and this power system is supplied to the power company PS. The upper bus UM connected by the interconnection line, the two upper substations UT1 and UT2 connected to the upper bus UM on the primary side, and the secondary side of the upper substations UT1 and UT2. The lower busbars LM1 and LM2 connected to each of the two lower busbars LM1 and LM2, the lower substation equipment LT connected to the lower busbar LM2 on the primary side, and the secondary side of the lower substation equipment LT. Connect the distribution lines to the other lower bus LM3, the two private generators 1 and 2 (G1, G2) whose transmission lines are connected to the lower buses LM1 and LM2, and the lower bus LM1 respectively. The factory load A (FLA) and the factory load B (FLB), and the factory load C (FLC) and the factory load D (FLD) in which distribution lines are connected to the lower bus LM3 and LM2, respectively, are provided.

Further, this power system includes a circuit breaker B1 provided on the interconnection line from the power company PS to the upper bus UM, and two upper substation equipment UT1s whose primary sides are connected to the upper bus UM, respectively. Circuit breakers B2 and B3 provided on the transmission line of UT2, and circuit breakers B4 and B5 provided on the transmission line from the secondary side of the upper substation equipment UT1 and UT2 to the lower busbars LM1 and LM2, respectively. Circuit breakers B6 and B7 provided on the transmission lines from the private generators 1 and 2 (G1, G2) to the lower bus LM1 and LM2, respectively, and the lower substation equipment whose primary side is connected to the lower bus LM2. Circuit breaker B8 provided on the transmission line of LT, circuit breaker B9 provided on the transmission line from the secondary side of the lower substation equipment LT to the lower bus LM3, and lower bus LM1, 2, 3 to 4 It is equipped with four circuit breakers B10 to B13 provided on each of the four distribution lines to the factory loads A to D (FLA, FLB, FLC, FLD).

In addition, the restoration order of the private generators 1 and 2 and the factory loads A, B, C, and D in this power system is higher when none of them has been restored, as shown in the restoration order table of FIG. Substation equipment UT1 and UT2 in order of proximity to the secondary side and factory load (assuming B and D) that generates by-product gas as fuel required for restoration of private power generators and voltage fluctuation in ascending order due to connection restoration (voltage) Considering the fluctuation B <D <C <A), for example, the numbers are 5, 6, 4, 1, 1, 3, and 2. Further, as shown in the restoration order table of FIG. 10, when the private generator 1 can be started in the middle of the load recovery operation of all factories, the restoration of the private generator 1 is prioritized, and the restoration of FIG. 11 is further prioritized. As shown in the ranking table, in the operating state after the start of the private generator 1 (after restoration), the order closer to the private generator 1 and the order of the smallest voltage fluctuation due to the connection restoration (here, because the private generator 1 is started). Considering the voltage fluctuation A <C), for example, the factory load A is set to No. 1 and the factory load C is set to No. 2.

In the normal state, the circuit breakers B1 to B13 are all "on", that is, in the energized state, and the upper bus UM, the upper substation equipment UT1, UT2, the lower substation equipment LT, and the lower bus LM1 from the electric power company PS. The main system via LM2 and LM3 supplies power to the factory loads A, B, C, and D, and the private generators 1 and 2 parallel to them also supply power to the factory loads A, B, C, and D.

FIG. 4 is an explanatory diagram showing the state of the power system of the power supply target facility when the interconnection is stopped from the electric power company. In this state, the power system is provided on the interconnection line from the electric power company PS to the upper bus UM. Only the circuit breaker B1 is "open", that is, in the circuit breaker state, and the other circuit breakers B2 to B13 are still in the on state.

FIG. 5 is an explanatory diagram showing the state of the power system of the power supply target facility at the time of a total power failure after the interconnection stop from the power company and the failure of independent maintenance, and the recovery order table of the private power generator and the factory load. In this state, the independent maintenance of the power system failed, so in order to prevent adverse effects on the factory load due to voltage fluctuations, all the other breakers B2 to B13 were opened, and the private generators 1 and 2 were also stopped. , The power system of the above power supply target facility is completely out of power.

FIG. 6 is an explanatory diagram showing the initial state of the restoration operation following the interconnection restoration from the electric power company after the total power failure of the electric power system of the power supply target facility, and the restoration order table of the private generator and the factory load. Here, only the circuit breaker B1 provided in the interconnection line from the electric power company PS to the upper bus UM is turned on, and the power is restored to the upper bus UM. The restoration order of the private power generators 1 and 2 and the factory loads A, B, C, and D is 5, 6, 4, 4, 1, 3, and 2.

7 and 8 show a case where the factory load is fully restored without waiting for the private power generators 1 and 2 to be able to start. FIG. 7 is an explanatory diagram showing the state at the time of turning on the 1st and 2nd side circuit breakers of the upper substation equipment and the recovery order table of the private generator and the factory load in the recovery operation from the state shown in FIG. Here, in addition to the circuit breaker B1 provided on the interconnection line from the electric power company PS to the upper bus bar UM, the circuit breaker B2 provided on the transmission lines on the 1st and 2nd secondary sides of the upper substation facilities UT1 and UT2. ~ B5 is also in the turned-on state, and the power is restored to the lower bus lines LM1 and LM2. The restoration order of the private power generators 1 and 2 and the factory loads A, B, C, and D is still 5th, 6th, 4th, 1st, 3rd, and 2nd.

FIG. 8 is an explanatory diagram showing a state at the time of full recovery of the factory load in the recovery operation (case 1) from the state shown in FIG. 7 and a recovery order table of the private generator and the factory load. The circuit breakers B8 and B9 provided on the transmission lines on the 1st and 2nd secondary sides of the lower substation equipment LT connected to the lower bus LM2 are also turned on, and the lower bus LM3 is also restored. , Factory loads A, B, C, and D are all restored by putting the circuit breakers B10 to B13 in the order according to the restoration order table. In the restoration order table, the restoration flag is set in conjunction with the restoration of the load of all factories, but since the private generators 1 and 2 are still in a non-startable state, the private generators 1 and 2 (G1, G2) The circuit breakers B6 and B7 provided on the transmission lines from the lower bus to the lower bus LM1 and LM2 are in an open state, respectively.

9 to 12 show a case where the private power generator 1 can be started in the middle of full restoration of the private power generator and the factory load as case 2. FIG. 9 shows the factory load in the restoration operation from the state shown in FIG. 7 after the power system of the power supply target facility is completely disconnected and the power is restored to the lower bus LM1 and LM2 after the interconnection from the electric power company is restored. It is an explanatory diagram showing a state in which a part of the power is restored and a recovery order table of the private power generator and the factory load. Here, as shown in FIG. 7, it is provided on the interconnection line from the electric power company PS to the upper bus UM. In addition to the circuit breaker B1, the circuit breakers B2 to 5 provided on the transmission lines on the 1st and 2nd secondary sides of the upper substation equipment UT1 and UT2 were also turned on, and the power was restored to the lower bus lines LM1 and LM2. In this state, the circuit breakers B11 and B13 of the factory loads B and D are turned on in the order according to the restoration order table, and the factory loads B and D are restored as a part of the factory load. In the recovery standings, a recovery flag is set at the corresponding position along with the recovery of this factory load.

FIG. 10 shows the state at the time of turning on the circuit breaker when the private power generator 1 can be started in the process of the recovery operation (case 2) from the state shown in FIG. 9, and the state of the private power generator and the factory load. It is an explanatory diagram showing the restoration order table, and here, the circuit breaker is in the same state as shown in FIG. 9, but since the private generator 1 can be started, the priority of the recovery order table is the private generator. 1 and 2 have been changed to No. 1 and 4, and factory loads A and C have been changed to No. 3 and 2.

FIG. 11 is an explanatory diagram showing the state at the time of restoration of the private power generator 1 and the recovery order table of the private power generator and the factory load in the recovery operation (case 2) from the state shown in FIG. The private power generator 1 has been activated and restored, and the circuit breaker B6 provided on the transmission line from the private power generator 1 to the lower bus LM1 is also in the turned-on state. In the restoration standings, a restoration flag is set in conjunction with the restoration of the private power generator 1. Then, since the private power generator 1 has been restored (started and operated), the priority of the recovery order table is 3 for the private power generator 2 in consideration of the order closer to the private generator 1 and the order of the smallest voltage fluctuation due to the connection restoration. No., factory loads A and C have been changed to No. 1 and No. 2. When restoring the private generators 1 and 2, priority is given to the restoration of the auxiliary machinery required for startup, and the private power generators are sequentially restored from the ones that have been restored and ready to start. go.

FIG. 12 is an explanatory diagram showing a state at the time of full recovery of the factory load in the recovery operation (case 2) from the state shown in FIG. 11 and a recovery order table of the private generator and the factory load. The circuit breakers B8 and B9 provided on the transmission lines on the 1st and 2nd secondary sides of the lower substation equipment LT connected to the lower bus LM2 are also turned on, and the lower bus LM3 is also restored. , The factory loads A and C are put into the state of turning on the circuit breakers B10 and B12 in the order according to the restoration order table, and the entire factory load is restored. In the restoration order table, the restoration flag is set in conjunction with the restoration of the load of all factories, but since the private generator 2 is still in a non-startable state, the private generator 2 (G2) is changed to the lower bus LM2. The circuit breaker B7 provided on the transmission line of the above is in an open state.

Therefore, according to the restoration operation device and the restoration operation method of the above-described embodiment, after a total power failure of the power system of the power supply target facility, the interconnection restoration from the electric power company and the in-house without waiting for the restoration of the in-house generators 1 and 2. Even in the restoration operation (Case 1) in the unrecovered state of the generators 1 and 2, also, after the total power failure of the power system of the power supply target facility, the interconnection restoration from the electric power company and only the private generator 1 Even in the restoration operation (Case 2) by halfway restoration, confirming the restoration of power to the bus by the power distribution breaker for factory load while considering the load characteristics that pose a problem in power quality and the voltage adjustment function of the private power generator. It is possible to perform early recovery from a power outage while maintaining the power quality.

Although described above based on the illustrated examples, the restoration operation device and the restoration operation method of the present invention are not limited to the above examples, and can be appropriately changed within the scope of the claims, for example. The power supply target facility is not limited to the steel mill, and the power system of the power supply target facility and the number of substation facilities, private power generators, and factory loads in the power system are not limited to those shown in the figure.

Further, although the flow chart showing the operation procedure of the restoration operation method that does not automatically restore the private power generator when the load of the entire factory is restored, the automatic restoration of the private power generator may be performed.

According to the recovery operation device and recovery operation method from a power failure of the present invention, early recovery from a power failure can be performed while maintaining the power quality in consideration of the load characteristics that pose a problem in power quality and the voltage adjustment function of the private generator. It can be carried out.

1 System information input unit 2 System information display unit 3 Load recovery order setting unit 4 Load recovery order change unit 5 Control signal output unit 6 Data processing unit 7 Data storage unit B1 to B13 Circuit breaker FLA to FLD Factory load A to D
G1, G2 private power generators 1, 2
LM1 to LM3 Lower bus lines 1-3
LT lower substation equipment PS power company UM upper bus UT1, UT2 upper substation equipment

Claims (6)

Normally, when a private power generator is connected to the main system of an electric power company to supply power to multiple factory loads, when the power system of the power supply target facility is completely out of power, it automatically recovers from the total power outage.
A recovery operation from a power failure, characterized in that an automatic recovery operation is performed so as to suppress voltage fluctuations in the power system of the power supply target facility according to the characteristics of the factory load and the operating status and startability status of the private power generator. Method. When the upper bus that connects the primary side of the upper substation to the main system of the electric power company becomes non-voltage and the electric power system of the power supply target facility falls into a total power outage.
First, as a total power failure opening operation, the circuit breakers on the primary side and the secondary side of the upper substation equipment, and the primary side and the secondary side of the lower substation equipment in which the primary side is connected to the secondary side of the upper substation equipment. The circuit breaker on the side, the circuit breaker of the transmission line of the private power generator to the lower bus connected to the secondary side of the upper substation or the secondary side of the lower bus, and the circuit breaker from the lower bus. Automatically open the circuit breaker of the distribution line for each factory load,
Next, waiting for the restoration of the main system of the electric power company, while monitoring the voltage of the upper bus and the lower bus and the power flow flowing through each circuit breaker, from the upper side of the power system of the power supply target facility. The recovery operation method from a power failure according to claim 1, wherein the circuit breakers are automatically turned on in sequence toward the lower level to perform an automatic recovery operation of the power system of the power supply target facility. In the restoration operation of the private power generator,
First, the auxiliary machinery necessary for starting the private power generator is restored.
The recovery operation method from a power failure according to claim 1 or 2, wherein when the auxiliary machinery is restored and the start-up is ready, the private power generator is started and restored. In the recovery operation of the multiple factory loads,
Claims 1 to 3, wherein the restoration operation is performed so as to suppress the voltage fluctuation due to the connection of each factory load and the voltage fluctuation of the power system of the power supply target facility according to the voltage adjustment function of the private power generator. The recovery operation method from a power failure described in any one of the above items. The power system of the power supply target facility according to the characteristics of each factory load in advance, the factory load in which by-product gas used as fuel necessary for the restoration of the private generator is generated, and the operating status and startability status of the private generator. The claim is characterized in that the private generator and the plurality of factory loads are restored according to a recovery order table in which the recovery order of the private generator and the plurality of factory loads is determined so as to suppress the voltage fluctuation of the private generator and the plurality of factory loads. The recovery operation method from a power failure according to any one of 1 to 4. Normally, in the recovery operation device for automatically recovering from a total power failure in the power system of the power supply target facility where a private power generator is connected to the main system of the power company to supply power to multiple factory loads.
A system information input unit for inputting information indicating the current state of the power system of the power supply target facility including the operation status and startability status of the private power generator, and
Of the plurality of factory loads, the factory load that generates by-product gas as fuel necessary for the restoration of the private power generator is prioritized, and the private power generator is suppressed so as to suppress voltage fluctuations in the power system of the power supply target facility. And the recovery order setting unit that sets the recovery order table that defines the recovery order of the multiple factory loads,
A recovery order changing unit that changes the recovery order of the private power generator and the plurality of factory loads read from the recovery order table so as to suppress voltage fluctuations of the power system based on the current state of the power system.
A control signal that outputs an open / close control signal to the circuit breaker of the transmission line of the private power generator and the distribution line for each factory load based on the recovery order of the private power generator and the plurality of factory loads read from the recovery order table. Output section and
A recovery operation device from a power outage, which is characterized by having a power outage.

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