KR101253757B1 - System and method for controlling electric power supply using supplementary power source - Google Patents

Abstract

PURPOSE: A power supply control system and a controlling method thereof using an auxiliary power source are provided to implement a stable power reserve rate by determining on and off states with respect to the capacity of a generator. CONSTITUTION: Multiple load groups(20a,20b,20c) are classified by priority. A measuring device(30) is arranged for measuring the current amount of power consumption of ordinary power. A generator(40) is arranged to enable the supply of power to the load groups. A system controlling part(50) stores a second set value lower than a first set value and a contract power amount. The system controlling part is controlled to turn the generator off when the current amount of power consumption is lower than the second set value. [Reference numerals] (50) System controlling part; (AA) Substation; (BB) KEPCO peak controller;

Description

Power supply control system and method using auxiliary power {SYSTEM AND METHOD FOR CONTROLLING ELECTRIC POWER SUPPLY USING SUPPLEMENTARY POWER SOURCE}

The present invention relates to the field of power supply control, and more particularly, to a power supply control system and method using an auxiliary power source that can stably perform maximum demand power management and emergency power management using an auxiliary power source.

In recent years, electronic electricity meters have been installed in most consumers, and the maximum demand power is measured and reflected in the electricity bill. The supplier and the customer enter into a contract for the maximum demand power, and when the maximum demand power exceeds the contract power, the overuse surcharge is added.

This is to manage the peak demand power at the moment because the use of power surges during a certain period of summer. The contract power is the maximum power that can be used for a certain period of time, and additional charges will be collected if the maximum demanded power used by the customer during that period exceeds the maximum power.

Therefore, from the customer's point of view, it is necessary to properly manage the peak demand power within the contract power, which is called peak control.

However, the conventional peak control is not stable because only the peak control is performed. For example, the conventional general peak control is to set a certain target value and cut off certain load elements when the instantaneous maximum demand power reaches the target value, and then connect again when the target value is lower than the target value. Once the high peak peak power is recorded, similar usage is repeatedly recorded for a while, so the simple blocking and connection method is not stable.

On the other hand, generators for emergency use in general customers are used only in emergency situations such as power outages.

Therefore, it is necessary to efficiently use the generator as an auxiliary power source to control the power supply efficiently in the emergency situation as well as the maximum demand power management situation.

Korean Patent Registration No. 10-1157651 describes a management apparatus and method for performing power switching to a peak generator. However, this patent technology is simply a method of switching loads to a generator when the peak peak demand reaches a peak and connecting it back to a constant power supply below it. As described above, since the peak is repeatedly generated for a certain time in the time zone when the peak demand power reaches the peak, unnecessary interruption and connection are frequently repeated and thus not stable.

Korea Patent Registration 10-1157651

The present invention provides a power supply control system and method using an auxiliary power source.

The present invention provides a power supply control system and method applied to a customer given a contracted power amount with a supplier.

The present invention provides a power supply control system and method using a generator as an emergency power source in an emergency situation and at the same time as an auxiliary power source in a maximum demand power management situation.

The present invention provides a power supply control system and method using an auxiliary power source to control the on / off operation in consideration of the capacity of the generator in the maximum demand power management situation.

The present invention provides a power supply control system using an auxiliary power supply, the system comprising: a constant power line; A plurality of load groups classified by priority; A metering device arranged to meter the current power consumption for the constant power; A generator arranged to supply power to the load groups; And a system control unit, wherein the system control unit stores the contracted power amount for the constant power source, a first set value lower than the contracted power amount, and a second set value lower than the first set value, When the measured current power consumption is equal to or greater than the first set value, the generator is turned on to control power to be supplied to at least one of the plurality of load groups, and the current power consumption measured by the metering device is set to a second set value. If less than, the generator is controlled to be OFF.

The difference between the first set value and the second set value may be greater than or equal to the capacity of the generator.

The plurality of load groups include a first load group and a second load group, wherein the first load group is switched to the generator in the regular power line to receive power from the generator in an emergency situation. The second load group is preferentially switched from the regular power line to the generator when the current power consumption for the regular power is more than the first set value.

The first load group and the second load group are connected to the generator through a first emergency power line and a second emergency power line, respectively, disposed between the first and second emergency power line and the generator and the system. And an automatic switching circuit breaker for switching between the first emergency power line and the second emergency power line according to a control signal of a controller.

According to a control signal of the system control unit, a first switching switch for switching the normal power line and the first emergency power line connected to the first load group with each other, the system control unit is to interrupt the blackout of the power line In a predetermined emergency situation, including, turning on the generator, and controls the automatic transfer breaker and the first switching switch to control the first load group to receive power from the generator.

And a second switching switch configured to switch the second load group between the regular power line and the second emergency power line, wherein the system controller is configured to determine the current set power consumption measured by the metering device. In case of abnormality, the automatic transfer breaker and the second switching switch are controlled to transfer the second load group to receive power from the generator.

The current power consumption is an instantaneous maximum demand power and is derived as an average value of power consumption at predetermined time intervals.

Preferably, the system control unit stores the winter temperature set value and the summer temperature set value, and receives the current temperature information when the input temperature is lower than the winter temperature set value or higher than the summer temperature set value, the second The load group is switched to receive power from the generator.

The present invention also provides a power supply control method using an auxiliary power supply for a customer to which a contracted power amount concluded with a supplier is provided, the method comprising: a first set value lower than the contracted power amount and a first lower value than the first set value; Setting setting values for the continuous power including a setting value; Measuring a current power consumption of the regular power of all the loads of the customer; And turning on / off a generator as the auxiliary power source according to a result of comparing the current power consumption amount with the set values, wherein the current power consumption amount is higher than the first setting value. The generator is turned on and the generator is turned off when the current power consumption is less than or equal to the second set value.

The difference between the first set value and the second set value may be greater than or equal to the capacity of the generator.

The total load of the customer includes a first load group and a second load group, wherein the first load group is supplied from the generator to be supplied with power from the generator in an emergency situation including an interruption of the regular power source. The generator is switched to the generator, and the second load group is preferentially switched from the regular power line to the generator when the current power consumption is equal to or greater than the first set value.

The current power consumption is an instantaneous maximum demand power and is derived as an average value of power consumption at predetermined time intervals.

According to the present invention, it is possible to efficiently manage not only the emergency but also the maximum demand power by using the generator as an auxiliary power source. In the existing power supply control system, the generator is mainly used only as an emergency power source in an emergency situation, and maximum demand power management is separately performed. However, the present invention is economical because the installed generator is used for both emergency situation management and maximum demand power management. The maximum demand power management can be performed. Moreover, in the system and method of the present invention, since the on / off is determined in consideration of the capacity of the generator, it is possible to secure a stable power reserve.

1 is a configuration diagram schematically showing a power supply control system using an auxiliary power source according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a system control unit employed in a power supply control system using the auxiliary power supply of FIG. 1.
3 is a graph illustrating a generator on / off control in the maximum demand power management situation of the power supply control system using an auxiliary power source according to an embodiment of the present invention.
4 is a diagram illustrating a power supply flow of the system of FIG. 1 in a normal situation.
5 is a diagram illustrating a power supply flow of the system of FIG. 1 in an emergency situation.
6 is a diagram illustrating a power supply flow of the system of FIG. 1 in a peak demand power management situation.
FIG. 7 is a diagram illustrating a power supply flow when the maximum demand power management situation of FIG. 6 is changed to an emergency situation.
FIG. 8 is a flowchart illustrating power supply control of the system of FIG. 1 in the peak demand power management situation of FIG. 6.
9 is a flowchart for explaining the overall operation of the power supply control of the system of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the embodiments of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Briefly, first, the system of the present invention relates to a power supply control system and method that can be applied to a customer who has contract power with a power supplier such as KEPCO. The contract power here refers to the limit of the instantaneous maximum demand power (momentary maximum power consumption) of the consumer. In addition, the instantaneous maximum demand power here is obtained by applying an average value every predetermined time interval. The predetermined time interval is actually 15 minutes is applied. When such contracted power is granted, the supplier has a substation facility to supply the contracted power to the customer. Instead, the customer pays a surcharge when the instantaneous power consumption (the instantaneous maximum demand power), which is obtained as an average value at predetermined time intervals as described above, is exceeded. It is an institution. Therefore, the consumer needs to manage the maximum demand power. The present invention utilizes a generator used as an emergency power source in an emergency situation such as a power failure and at the same time as an auxiliary power source for managing the above-mentioned maximum demand power. Furthermore, the system and method of the present invention classifies the entire load elements according to priority and selects the load group to be transferred to the generator according to the emergency situation or the maximum demand power management situation. In addition, since the ON / OFF condition of the generator is set in consideration of the margin in addition to the capacity of the generator, more stable and efficient power supply control is achieved.

1 is a configuration diagram schematically showing a power supply control system using an auxiliary power source according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a system control unit employed in a power supply control system using the auxiliary power supply of FIG. 1.

In the power supply control system using the auxiliary power source according to the preferred embodiment of the present invention, the continuous power line A, a plurality of load groups 20a, 20b, and 20c classified as priorities, and the current power consumption of the continuous power source The metering device 30 is arranged to measure the, and the generator 40, and the system control unit 50 for performing the overall control of the system.

Such a system uses the generator 40 as an emergency power source in an emergency situation and at the same time as an auxiliary power source for maximum demand power management.

The system to which the system of the present invention is applied is a customer who uses an auxiliary power source such as the generator 40 while using power supplied from a supplier such as KEPCO as a constant power source. In particular, the present invention is applied to a customer having an auxiliary power source such as a generator in a customer that is given a contracted power amount or a maximum demand power amount at the moment of making a contract with a supplier.

Therefore, the system according to the preferred embodiment of the present invention includes a generator 40 as an auxiliary power source in addition to the regular power supplied from the constant power line (A). As described above, the present invention not only uses the generator 40 as an emergency power source for supplying power to emergency facilities in an emergency situation such as a power failure, but also as an auxiliary power source for maximum demand power management.

The system of the present invention classifies the entire load elements into a plurality of groups 20a, 20b, and 20c according to their priorities, and transfers load groups suitable for emergency or management of maximum demand power to receive power from the generator.

The system of the present invention, for example, there are emergency facilities to be normally operated such as an elevator even if the constant power supplied from KEPCO is interrupted, and includes a first load group 20a to which they belong.

In addition, when the current power consumption is close to or exceed the maximum demand power, and includes a second load group (20c) to be the priority (peak cutting) to always cut the power for maximum demand power management. As described in detail below, in the maximum demand power management situation, the second load group 20c is switched to receive power from the generator 40 by interrupting the regular power first.

In addition, the system of the present invention includes a third load group 20b. In the system according to the preferred embodiment of the present invention, the third load group 20b is interrupted from the continuous power supply in the emergency situation, but is continuously supplied from the constant power supply in the maximum demand power management situation.

Therefore, in the system according to the preferred embodiment of the present invention, the first emergency power line Q1 and the second for supplying power from the generator 40 to the first load group 20a and the second load group 20c, respectively. Emergency power line Q2 is provided.

In addition, the preferred embodiment of the present invention is a switch for performing the switching operation according to the situation and conditions, and includes an automatic switching circuit breaker (ATCB), the first switching switch (ATS1), and the second switching switch (ATS2). The ATCB may be replaced with two breakers (ATS with ACBs).

The automatic transfer breaker ATCB selectively connects the generator 40 between the first emergency power line Q1 and the second emergency power line Q2 to connect the first load group 20a or the second load group 20b. Optionally switch to a generator. An automatic transfer breaker (ATCB) is also arranged to cut off the power from the generator 40.

In addition, the system of the present invention allows the first load group 20a to be selectively connected to any one of the constant power line A and the first emergency power line Q1 so that the first load group 20a is connected to the constant power line A. And a first switch ATS1 to be selectively switched to the generator 40.

In addition, the system of the present invention is provided with a second switching switch (ATS2) for switching so that the second load group 20c is connected to any one of the constant power line (A) and the second emergency power line (Q2).

The system controller 50 compares the input / stored set values with the current power consumption (maximum demand power) for the continuous power measured by the metering device 30 to generate a corresponding control signal. The control signal of the system controller 50 includes an on / off operation of the generator 40 and a control for switching / blocking the above-described switches.

Setting values for the management of the maximum demand power input / stored in the system controller 50 are as follows. The contract power for the constant power source, a first set value lower than the contract power, and a second set value lower than the first set value.

As described above, the contract power P relates to the instantaneous maximum demand power (the limit of the maximum power consumption) contracted by the supplier and the customer in advance, wherein the instantaneous maximum power consumption is derived as an average value at predetermined time intervals. Actually, the highest value among the 15 minute average values is applied.

The first set value is a target value for managing the maximum power consumption, and may be, for example, 90% of the contracted power amount. The system controller 50 turns on the generator 40 when the current power consumption (the instantaneous maximum demand power amount) of the regular power supply is equal to or greater than the first set value.

The second set value is lower than the first set value and is determined according to the capacity of the generator 40. For example, in the case where the power generation capacity is installed at 20% of the contract power, it is set to 65% of the contract power considering the margin of 5%. In a preferred embodiment of the present invention, the generator 40 is turned off when the current power consumption is less than the second set value.

In the power supply control system using the auxiliary power source according to the preferred embodiment of the present invention, as can be seen in the drawing, once the current power consumption measured by the metering device 30 reaches the first set value which is the target value, the generator ( 40) is turned on and turned off below the second set value. As described above, in the present invention, not all of the on / off is performed at the first set value which is the management target value. This is because once the first set value is reached, the power consumption is maintained substantially for a considerable time. Therefore, the generator 40 is operated even below the first set value and the peak cutting control is performed to allow the second load group 20c to receive power from the generator 40.

Therefore, a stable reserve ratio can be secured in terms of maximum demand power management. For example, when the current power consumption reaches the first set value that is the target value, the generator 40 is turned on and the second load group 20c is switched to receive power from the generator. In addition, the second load group 20c is switched to the constant power line A while the generator 40 is turned off below the second set value considering the capacity of the generator 40. Once the current power consumption reaches the first set point, the power consumption is generally high, and similar power demand is maintained for a certain time thereafter, and at that time, the supply of continuous power may be unstable at worst. Because there is. In this time period, the generator 40 is not simply used as an emergency power source, but is used as an auxiliary power source in the maximum demand power management situation, and further, the second load group 20c is used to draw power from the generator 40 in consideration of the generator capacity. Stable management can be performed by performing a peak cutting transfer to be fed.

Hereinafter, with reference to the drawings will be described a power supply control operation for each situation in the power supply control system using the auxiliary power source according to an embodiment of the present invention.

4 is a diagram illustrating a power supply flow of a system according to the present invention in a normal situation.

In a normal situation, for example, the regular power supply from KEPCO, which is a supply source, is normally supplied, and the current power consumption of all the load groups of customers is not reaching the first set value, which is the above-described target value.

In this case, the system controller 50 compares the current power consumption measured and input from the metering device 30 with the first set value, and determines that the system is in a normal state. The power supply line of all load groups 20a, 20b, and 20c Control to receive power from A).

At this time, the first switching switch ATS1 connects the first load group 20a to the constant power line A according to the control signal of the system control unit 50, and the second switching switch ATS2 is connected to the second load group ( Connect 20c) to the constant power line (A).

5 shows the power supply flow of the system according to the invention in an emergency.

When an emergency situation such as a power failure occurs, the system controller 50 turns on the generator 40 and at the same time switches the automatic transfer breaker (ATCB) to connect the generator 40 to the first emergency power line Q1 to provide emergency facilities. The first load group 20a is switched to receive power from the generator 40.

6 to 8 are views for explaining the power supply control of the system according to the present invention in the maximum demand power management situation. Specifically, FIG. 6 is a diagram illustrating a power supply flow in a peak demand power management situation. FIG. 7 is a diagram illustrating a power supply flow when the maximum demand power management situation of FIG. 6 is changed to an emergency situation. 8 is a flowchart for explaining the power supply control in the maximum demand power management situation.

In the case of FIG. 6, power supply from KEPCO is normally performed, but current power consumption reaches a first set value, which is a target value. As in step S110 of FIG. 8, once the current power consumption amount input from the metering device 30 reaches the first set value, the system controller 50 turns on the generator 40 (step S120). At the same time, the system control unit 50 switches the automatic transfer breaker ATCB so that the second emergency power line Q2 is connected to the generator 40, and also switches the second transfer switch ATS2 to the second load group ( 20c) is switched to receive power supply from the generator 40 (step S130).

Subsequently, when the current power consumption measured and input from the metering device 30 becomes equal to or less than the second set value (step S140), the system controller 50 turns off the generator 40 (step S150). At the same time, the system controller 50 switches the second switching switch ATS2 such that the second load group 20c, which was peak cut, is supplied with power from the constant power line A (step 160).

FIG. 7 illustrates an emergency situation such as a power failure in the maximum demand power management situation as described above. It can be expected that this can occur frequently enough during peak cutting operation. If a power failure or unstable power supply is unstable, the system control unit 50 immediately switches to the emergency power supply control mode. That is, the first load group 20a is switched to receive power from the generator 40 by switching between the ATCB and the first switching switch ATS1 through a control signal.

As described above, the power supply control system using the auxiliary power supply of the present invention utilizes the generator 40 appropriately not only in emergency situations but also in maximum demand power management situations. Furthermore, in the maximum demand power management situation, the on / off timing of the generator 40 is set in consideration of the margin considering the capacity of the generator 40. For example, in the case where the limit value of the maximum contracted power amount and the maximum demanded power amount is 10,000KW and the generator capacity is 200KW, which is 20% of the generator capacity, the first set value which is the point of turning on the generator 40 is 90% of the contracted power amount. The second set value for turning off the generator 40 may be set to 70% of the contracted power amount by subtracting the generator capacity from the first set value. Preferably, the second set value may be set to 65% of the contract power amount in consideration of the margin.

Power supply control of the power supply control system using the auxiliary power supply of the present invention described above is generally controlled by the system controller 50. Specifically, as shown in FIG. 2, the system controller 50 includes a main operation processor 510, a storage unit 520, an external I / O unit 530, a communication unit 540, and a display unit 550. It may include. It may also be connected to the remote control PC 600 through the communication unit 540.

The system controller 50 receives data necessary for power supply control from other components through the external I / O unit 530. For example, as shown in the drawing, the system controller 50 is configured to measure various set values and the maximum demand power measured by the metering device 30 through the external I / O unit 530, and to operate from various accessory devices. Input necessary information such as information. For example, the necessary information may include the measured value of the generator meter 31, meteorological office information, operation information of each component.

The data input in this way is stored in the storage unit 520.

The main operation processor 510 compares / determines the input / stored set value, measured value, and operation information of the component to generate a predetermined control signal. For example, the control signal may be a control signal for an ATCB, a peak control switching switch control signal, and an emergency switching switch control signal. In addition, various alarms are output through the alarm unit 531.

In addition, the system controller 50 may visually display various data of the system through the display unit 550.

9 is a flowchart of the overall power supply control flow in the power supply control system using the auxiliary power source according to the preferred embodiment of the present invention. Here, it is assumed that the auxiliary power source is a generator with the constant power source as KEPCO, and shows the total power supply control made in the system of the present invention.

The system of the present invention can also be connected to the Meteorological Agency site or a location from which temperature information can be obtained to perform peak control according to temperature. For example, the system controller 50 stores the winter temperature set value and the summer temperature set value, and transfers the second load group to receive power from the generator when the temperature is lower than the set value temperature in winter, and summer temperature in the summer. When the temperature is higher than the set value, the second load group is switched to receive power from the generator. This enables a more stable power supply control by performing peak control by predicting the current temperature in advance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

20a: first load group 20b: third load group
20c: load group 2 30: weighing device
31: generator meter 40: generator
50: system control unit 510: main operation processing unit
520: storage unit 530: external I / O unit
531: alarm unit 540: communication unit
550: display unit 600: remote control PC
A: Constant power line ATCB: Automatic transfer breaker
ATS1: first switch ATS2: second switch

Claims (12)

As a power supply control system using auxiliary power:
Regular power line;
A plurality of load groups classified by priority;
A metering device arranged to meter the current power consumption for the constant power;
A generator arranged to supply power to the load groups; And
It includes; system control unit,
The system controller stores the contract power amount for the continuous power source, a first set value lower than the contract power amount, and a second set value lower than the first set value.
When the current power consumption measured by the metering device reaches a first set value, the generator is turned on to control power to be supplied to at least one of the plurality of load groups, and the current power consumption measured by the metering device. If the second set value is less than the generator to control (OFF),
The current power consumption is the instantaneous maximum demand power and is derived as an average value of power consumption at predetermined time intervals.
The difference between the first set value and the second set value is greater than the capacity of the generator,
Power supply control system using auxiliary power.
delete The method according to claim 1,
The plurality of load groups include a first load group and a second load group,
The first load group is switched to the generator in the regular power line so as to receive power from the generator in priority in an emergency situation,
The second load group is to be switched to the generator in the normal power line first when the current power consumption for the regular power is more than the first set value,
Power supply control system using auxiliary power.
The method according to claim 3,
The first load group and the second load group are connected to the generator through a first emergency power line and a second emergency power line, respectively.
And an automatic switching circuit breaker disposed between the first and second emergency power lines and the generator and mutually switching the first emergency power line and the second emergency power line according to a control signal of the system controller.
Power supply control system using auxiliary power.
The method of claim 4,
In accordance with a control signal of the system control unit, a first switching switch for switching between the normal power line and the first emergency power line connected to the first load group,
The system control unit turns on the generator in a predetermined emergency situation including a power failure of the power line and controls the automatic transfer breaker and the first switching switch so that the first load group receives power from the generator. To control,
Power supply control system using auxiliary power.
The method of claim 4,
The second load group includes a second switching switch which is installed so as to be switched between the normal power line and the second emergency power line,
The system controller is configured to control the automatic transfer breaker and the second switching switch when the current power consumption measured by the metering device is equal to or greater than the first set value so that the second load group receives power from the generator. That,
Power supply control system using auxiliary power.
delete The method according to claim 3,
The system control unit stores the winter temperature set value and the summer temperature set value,
When the temperature received by receiving the current temperature information is lower than the winter temperature set value or higher than the summer temperature set value,
Switching the second load group to receive power from the generator,
Power supply system using auxiliary power.
As a control method of power supply using auxiliary power supply for the customer given the contracted power amount with the supplier:
Setting setting values for a continuous power source including a first setting value lower than the contract power amount and a second setting value lower than the first setting value;
Measuring a current power consumption of the regular power of all the loads of the customer; And
And turning on / off a generator as the auxiliary power source according to a result of comparing the current power consumption with the set values.
When the current power consumption reaches the first set value, the generator is turned on, and when the current power consumption is less than the second set value, the generator is turned off, and the current power consumption is instantaneously maximum. As power demand, it is derived as the average value of power consumption at predetermined time intervals.
The difference between the first set value and the second set value is greater than the capacity of the generator,
Power supply control method using auxiliary power. delete The method according to claim 9,
The total load of the customer includes a first load group and a second load group,
The first load group is switched from the regular power source to the generator to receive power from the generator in an emergency situation including the power failure of the regular power source,
Wherein the second load group is to be switched to the generator from the constant power first when the current power consumption is greater than the first set value,
Power supply control method using auxiliary power.
delete

Images