KR100884207B1 - Complex control apparatus for electric power system - Google Patents

Abstract

A complex control apparatus for an electric power system is provided to extend lifetime of a condenser and a relay by blocking the generation of an instant rush current and a surge current. A complex control apparatus for an electric power system includes a relay management device and a central management device. The central management device(101) includes an automatic power factor control module, a demand control module and a standby power control module. The automatic power factor control module outputs a power factor control signal to the relay management device. The demand control module outputs a peak power control signal to the relay management device. The standby power control module outputs a standby power control signal to the relay management device. The relay management device(107) opens or closes a specific condenser in a condenser bank on the basis of the power factor control signal. The relay management device sequentially blocks contact points in a load-by-load blocking circuit on the basis of the peak power control signal. The relay management device opens or closes contact points in a standby power switching circuit on the basis of the standby power control signal.

Description

COMPLEX CONTROL APPARATUS FOR ELECTRIC POWER SYSTEM}

The present invention relates to a control device for a power system, and more particularly, to a complex control device for a power system for performing automatic power factor control, peak power control and standby power control.

While the power produced by the power plant is being delivered to the consumer, losses occur for various reasons. A representative reason for the power loss is power loss due to a low power factor. In an AC circuit, reactive power means power that circulates between the power supply and the load without doing anything when an AC voltage is applied to a load including a reactance (inductive component). In the case of an inductive load in an alternating current circuit, when the alternating current passes through the inductive load, a ground current is generated to lower the power factor. In response to the lower power factor, reactive power increases, resulting in increased power loss due to high loads on power lines, pole transformers, and the like. For example, utility companies, such as KEPCO, which provide commercial power, charge different rates according to the power factor. KEPCO adds up to 5% of penalty power costs when the power factor is less than 90%, and reduces power costs by up to 5% when the power factor is over 90%. Operate. Therefore, in order to reduce the power usage cost due to low power factor, it is urgent to introduce a device that monitors and controls the power factor in real time.

Along with the power loss due to low power factor, the power loss due to standby power in the consumer is also an important reason. In the case of breaks, holidays, etc., power loss due to standby power that is lost while the power is not automatically shut down adds unnecessary power costs to customers. Therefore, the consumer is urgently required to introduce a device that automatically cuts off standby power during the scheduled time according to the scheduling.

In addition, even when peak power due to the use of air conditioners, etc. in the summer, excessive power consumption costs may occur in the consumer. In the occurrence of peak power, there is a need for a method that can automatically control the generation of peak power by controlling the preliminary load according to a set value and sequentially blocking the contact points.

In the case of direct human control of the power system, there may be disadvantages in that the lesson time is inherently impossible to control the power system. There is also a risk that large accidents due to instantaneous mistakes can occur, for example in the case of human direct control of the power system at risk sites handling flammable materials. Therefore, it is necessary to introduce an automatic control device for the power system.

Accordingly, an object of the present invention is to solve the above problems. It is a specific object of the present invention to provide a complex control apparatus for a power system that can automatically perform power factor control, peak power control and standby power control.

Another object of the present invention is not only to block the occurrence of instantaneous inrush current and surge current, but also to sequentially control the contact points, thereby significantly reducing the failure rate, to extend the life of the capacitor, and to control the power system that can extend the relay life. To provide a device.

Still another object of the present invention is to provide a complex control apparatus for a power system that can easily cope with a change in an instant load by increasing a control speed.

Still another object of the present invention is to control a preload according to a preset value in a peak power generation situation, a plurality of contacts are sequentially blocked, thereby controlling the peak power generation inherently, thus reducing the power usage cost. It is to provide a control device.

It is still another object of the present invention to provide a complex control device for a power system that can effectively control a preload according to a target value, and reduce accidents caused by overload by performing simultaneous start and simultaneous overload control.

Still another object of the present invention is to provide a complex control apparatus for a power system that can prevent power loss due to standby power according to a predetermined scheduling.

In order to achieve the above objects, according to an aspect of the present invention, in a device connected to the load, and having a complex control of the power system, a power factor for automatically controlling the power factor corresponding to the load with a relay control device An automatic power factor control module for generating a control signal and transmitting it to the relay control device, a demand control module for generating a control signal for peak power and transmitting it to the relay control device, and a control signal for standby power for generating the control signal. A central control device including a standby power control module for transmitting to the relay control device, the relay control device opens and closes a specific capacitor in the capacitor bank based on the power factor control signal, the load based on the power control signal for the peak power It sequentially blocks the contact with respect to the star breaking circuit, the standby Based on the control signal to the force it is possible to provide a hybrid control device for a power system, characterized in that for opening and closing the contacts of the air opening and closing electric power circuits.

In a preferred embodiment, the relay control device is characterized in that it has 14 channels as a control port for automatic power factor control. In addition, the relay control device is selected from any one of four circuits, six circuits, eight circuits, ten circuits, 12 circuits, and 14 circuits, characterized in that only the selected circuit is used as the power factor control circuit. In addition, the standby power control module monitors a power state corresponding to the power system for a predetermined period, and stores the monitored power state information in a memory. In addition, the combined control device for a power system according to an aspect of the present invention is an output unit for outputting information for the user to specify the set value for power factor control, peak power control and standby power control and the user specifies the set value It may further include an input and output unit including an input unit to be. The information may also include at least one of a voltage phase, a current phase, and a power factor value. In addition, the power factor control signal is based on a power factor control setting value specified by the user, the control signal for the peak power is based on the setting value of the peak power control specified by the user, the control signal for the standby power is specified by the user It is characterized in that the generated based on the set value of the standby power control.

According to the present invention, the following effects can be expected.

According to the present invention, a specific object of the present invention can provide a complex control apparatus for a power system capable of automatically performing power factor control, peak power control and standby power control.

In addition, according to the present invention, it not only blocks the occurrence of the instantaneous inrush current and the surge current, but also sequentially controls the contact to dramatically reduce the failure rate to extend the life of the condenser, combined control of the power system that can extend the relay life A device can be provided.

In addition, according to the present invention, it is possible to provide a complex control apparatus for a power system that can easily cope with a change in an instant load by increasing the control speed.

In addition, according to the present invention, by controlling the preliminary load according to a predetermined value in the peak power generation situation, a plurality of contact points are sequentially blocked to control the peak power generation inherently to control the power system that can reduce the power usage cost A device can be provided.

In addition, according to the present invention, it is possible to provide a complex control device for a power system that can effectively control the preload according to the target value, and to reduce the accident due to overload by performing simultaneous start and simultaneous overload control.

In addition, according to the present invention, it is possible to provide a complex control apparatus for a power system capable of preventing power loss due to standby power according to a predetermined scheduling.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a view showing a composite control device for a power system according to a preferred embodiment of the present invention. Referring to FIG. 1, a complex control device for a power system includes a central control device 101, a display 103, and a relay control device 107.

The central control unit 101 automatically performs combined control of power factor control, peak power control and standby power control in accordance with the present invention. In addition, the central control device 101 according to the present invention serves to control the overall operation of the display 103, the relay control device 107. The central control unit automatically performs power factor control, peak power control and standby power control based on the settings of the power factor control, peak power control and standby power control inputted by the user via the PC 105. The central control apparatus may include an automatic power factor control module for automatically controlling power factor, a demand control module for automatically controlling peak power, and a standby power control module for automatically controlling standby power. The configuration and role of the central control unit 101 will be described in more detail with reference to FIGS. 2 and 3.

The display 103 is preferably implemented by LCD, and serves to output a variety of information so that the user specifies the set values of power factor control, peak power control and standby power control according to the present invention via the PC 105. . Display 103 may be connected to PC 105 via RS232 serial communication. The display 103 may output voltage phase, current phase and / or power factor in real time in the form of a graphic or alpha numeric under the control of the central control unit 101. The user may manually control the power factor to a desired power factor based on the information of the voltage phase, current phase, and / or power factor output to the display 103.

The relay control device 107 opens and closes the contact point to automatically perform power factor control, peak power control, and standby power control with respect to the load 109 according to the control signal of the central control device 101. The relay control device 107 according to the present invention may include a capacitor bank (not shown) for power factor control. In another preferred embodiment of the present invention, the relay control device 107 may include a contact opening and closing to select each capacitor of a capacitor bank (not shown) for power factor control. The relay control device 107 according to the present invention may include 14 channels as a control port for automatic power factor control, and select 4 circuits, 6 circuits, 8 circuits, 10 circuits, 12 circuits, and 14 circuits according to the situation. Only the selected circuit can be used as the circuit for power factor control. Of course, it will be apparent to those skilled in the art that the control port for automatic power factor control may include various channels other than 14 channels. As a result, it is possible to block generation of instantaneous inrush current and surge current between port movements, and it is possible to extend the capacitor life of the capacitor bank and the relay life by dramatically reducing the failure rate due to the sequential control. In addition, there is an advantage that can significantly increase the control speed due to the sequential control. In addition, the relay control device 107 according to the present invention may include a load-specific breaking circuit (not shown) for the peak power control.

The relay control device 107 according to the present invention serves to sequentially block the preload based on the setting value for the peak power control set by the user using the PC 105. Preferably, the load-specific circuit breaker according to the present invention is implemented with eight circuits. However, it will be apparent to those skilled in the art that load-specific circuits may be implemented in various forms. Since the relay control device 107 according to the present invention sequentially cuts the contacts of the eight-stage cut-off circuits in a situation in which peak power is generated based on a set value by the user (especially in summer), Occurrence can be controlled at source. As a result, the cost of electricity can be reduced, and the preliminary load can be effectively controlled by setting a target value every year, and the overload transformer and the system including the same can be prevented in advance according to simultaneous start and simultaneous overload control. It can prevent the damage of life and property. In addition, the relay control device 107 according to the present invention may include a standby power switching circuit (not shown) for standby power control. That is, the relay control device 107 according to the present invention controls the standby power control module of the central control device 101 based on the setting value (or scheduling) for the standby power control set by the user using the PC 105. By cutting off the power for the class time, and serves to connect the power in accordance with the day and time. The standby power control module of the central control unit 101 may be designed to monitor the power system as well as the function of overall control of the standby power based on the set value by the user. That is, the standby power control module of the central control unit 101 monitors the power state by a predetermined time (for example, 15 seconds), and stores the monitored power state in a memory. The manager (or user) can analyze the waste of time spent on lessons based on the power state stored in the memory and make improvements. In addition, the relay control device 107 according to the present invention may include a zigzag filter and a series reactor of six pairs of windings connected in parallel to the load. Zig-zag filters and series reactors with six pairs of windings can reduce the nonlinear 3, 5, 7, 9, 11, and 13 harmonics generated by the load.

2 is a view showing the configuration of a central control apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 2, the central control unit includes a memory system 250, at least one central processing unit (CPU) 260, an input unit 270, and a communication unit connected thereto to perform high speed operation. 280 may include. The central processing unit 260 includes an Arithmetic Logic Unit (ALU) 262 for performing calculations, a register 264 for temporary storage of data and instructions, and a controller 266 for controlling the operation of the LED display unit remote management system. ). The central processing unit 260 includes Digital, Alpha, MIPS Technology, NPS, NEC, IDT, Siemens, etc. MIPS, Intel and Cyrix, AMD, and Nexgen. It could be a processor with a variety of architectures, such as the company's x86 and IBM's and Powerola's PowerPC. The memory system 250 generally includes a high speed main memory 252, which is a storage medium such as random access memory (RAM) and read only memory (ROM), and a floppy disk, hard disk, tape, CD-ROM, flash memory, or the like. Auxiliary memory 254 in the form of a long-term storage medium and a device for storing data using electrical, magnetic, optical or other storage media. In addition, the main memory 252 may include a video display memory for displaying an image through the display device.

In addition, the input device 270 may include a keyboard, a mouse, for example, a physical transducer such as a touch screen or a microphone. The communication device 280 may be a device such as a network interface for performing communication with the PC 105. In an embodiment of the present invention, the network interface may support an RS232 communication scheme.

3 is a view showing the module configuration of the central control device according to an embodiment of the present invention.

Referring to FIG. 3, the central control unit automatically generates a power factor control signal for controlling the power factor based on the set value by the user, and transmits the generated power factor control module 362 to the relay control device by the user. Based on this, the demand control module 364 generates a power control signal for peak power and delivers the power control signal to the relay control device, and generates a control signal for standby power based on a set value (or scheduling) by the user to control the relay. The device may include a standby power control module 366 that transmits the power state to the device at predetermined intervals and stores the monitored power state information in a memory.

The overall configuration of the central control unit through these application modules is as follows.

The central control unit can use various operating systems (OS) as the OS of the system. The OS provides a high level command to an application program interface (302) to control the operation of each application module 360.

The central control apparatus includes a high level instruction processing unit 304 for identifying each corresponding application module 360 according to the high level instructions provided from the API 302, and decoding the high level instructions and providing them to the corresponding places. . The application module controller 350 controls the operation of the application module 360 according to the command provided from the high level command processor 304. That is, the high level instruction processing unit 304 identifies whether there is an application module 360 corresponding thereto according to the high level instruction provided through the API 302, and corresponds to the case where the corresponding application module 360 exists. Decoded by a command recognized by the application module 360 to be transmitted to the corresponding mapping unit or to control the transmission of the message. Accordingly, the application module controller 350 may map the mapping units 351, 353, and 355 and the interface units 352, 354, and 356 to the automatic power factor control module 362, the demand control module 364, and the standby power control module 366. Each).

The automatic power factor control module mapping unit 351 generates a power factor control signal for automatically controlling the power factor based on a setting value by the user from the high level command processor 304 and transmits the generated power factor control signal to the relay controller. Received, and mapped to a device level that can be processed by the automatic power factor control module 362, and provides to the automatic power factor control module 362 through the automatic power factor control module interface unit 352.

The demand control module mapping unit 353 and the demand control module interface unit 354 generate a power control signal for peak power based on a user-specified value and transmit the generated power control signal to the relay controller. That is, the demand control module mapping unit 353 receives a high level command for using the demand control module 364 from the high level command processing unit 304, maps it to a device level command, and executes the demand control module interface unit ( 354 to the demand control module 364.

The standby power control module 366 generates a control signal for standby power based on a setting value (or scheduling) by the user, transmits the control signal to the relay control device, monitors the power state at a predetermined period, and monitors the monitored power state information. This is the part stored in memory. The standby power control module mapping unit 355 receives the high level command applied through the high level command processing unit 304 and maps the device to the device level command that can be recognized by the standby power control module 366. The device level command is provided to the standby power control module 366 via the standby power control module interface 356.

4 is a diagram schematically showing an internal configuration of a relay control device according to a preferred embodiment of the present invention. Referring to FIG. 4, the relay control device 107 may include a capacitor bank 401, a load-specific breaking circuit 403, and a standby power switching circuit 405. Also in another preferred embodiment of the present invention, the relay control device 107 may further include a hexahedral zigzag filter and a series reactor connected in parallel to the load to reduce the nonlinear harmonics of the load.

The relay controller 107 opens and closes a specific capacitor of the capacitor bank 401 based on the automatic power factor control signal generated by the automatic power factor control module of the central controller described above, thereby improving the power factor. In another preferred embodiment of the present invention, the relay control device 107 selects each capacitor of the capacitor bank 401 for power factor control based on the automatic power factor control signal generated by the automatic power factor control module of the central controller. It may include a contact that is opened and closed. The relay control device 107 according to the present invention may include 14 channels as a control port for automatic power factor control, and select 4 circuits, 6 circuits, 8 circuits, 10 circuits, 12 circuits, and 14 circuits according to the situation. Only the selected circuit can be used as the circuit for power factor control. Accordingly, generation of instantaneous inrush current and surge current between port movements can be prevented, and the failure rate can be dramatically reduced due to sequential control, thereby extending the life of the capacitor and the life of the relay of the capacitor bank 401. In addition, there is an advantage that can significantly increase the control speed due to the sequential control.

In addition, the relay control device 107 according to the present invention sequentially blocks the contact with respect to the load-specific circuit 403 based on the peak power control signal generated by the demand control module of the central control device described above. The load-specific circuit 403 according to the present invention is preferably implemented with eight circuits. In the situation where the peak power is generated by the relay control device 107 according to the set value by the user, an eight-load cut-off circuit according to the peak current control signal generated by the demand control module of the central control device By sequentially blocking the contacts of, the generation of peak power can be controlled at the source.

In addition, the relay control device 107 according to the present invention cuts off a specific circuit of the standby power switching circuit 405 based on the standby power control signal generated by the standby power control module of the central control device described above. The standby power switch circuit 405 may be implemented with four circuits. That is, the relay control device 107 according to the present invention controls the standby power control module of the central control device 101 based on the setting value (or scheduling) for the standby power control set by the user using the PC 105. By cutting off the power for the class time, and serves to connect the power in accordance with the day and time. Preferably, for example, by turning on the power 10 minutes before the work day and cutting off the power at the beginning of the lesson time, not only the waste due to the standby power can be reduced, but also the occurrence of fire due to a short circuit can be reduced. In addition, since the complex control apparatus for the power system according to the present invention can monitor the power state unattended, it is possible to effectively cut off the leakage current in a dangerous area in which flammable material is present, thereby reducing the fire occurrence rate.

5 is a diagram exemplarily illustrating an input / output device for controlling a power factor in real time according to another exemplary embodiment of the present invention. In the present embodiment, a device in which the display and the PC described with reference to FIG. 1 are integrated may be applied.

Referring to FIG. 5, an input / output device for controlling a power factor in real time according to another exemplary embodiment of the present invention includes an output unit 501 and an input unit 503. The output unit 501 outputs state information including a voltage phase, a current phase, a power factor value, and the like, and is preferably an LCD, but is not limited thereto. The user may recognize the state information output to the output unit 501 and control the power factor in real time. When the user selects a specific item (for example, the detected power factor) from the state information, the corresponding state information is output to the output unit 501. In this embodiment, the state information output through the output unit 501 is described as state information for power factor control, but may include state information for peak power control and standby power control.

The input unit 503 allows a user to input a user's selection signal (set value) for opening and closing of each of the plurality of advanced capacitors included in the capacitor bank based on the state information. The input unit 503 is preferably a keypad, but is not limited thereto. In a preferred embodiment of the present invention, when the relay control device is implemented with an automatic power factor of 14 channels, the user can select the keypad of C1 to C14. The automatic power factor 14 circuit is selected from any of four, six, eight, ten, twelve, and fourteen circuits, and only the selected circuit can be used as a circuit for power factor control. Although the input unit 503 has been described as inputting a user's setting value for power factor control in this embodiment, it may be implemented to input the user's setting value for peak power control and standby power control.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 is a view showing a composite control device for a power system according to a preferred embodiment of the present invention.

2 is a view showing the configuration of a central control apparatus according to a preferred embodiment of the present invention.

3 is a view showing the module configuration of the central control device according to an embodiment of the present invention.

Figure 4 is a schematic diagram showing the internal configuration of the relay control device according to a preferred embodiment of the present invention.

5 is a diagram illustrating a display component and an input component according to a preferred embodiment of the present invention.

Claims (7)

In a device that is connected to the load and has complex control over the power system, With relay control device An automatic power factor control module for automatically generating a power factor control signal for controlling the power factor corresponding to the load and transmitting it to the relay control device, a demand control module for generating a control signal for peak power and transmitting it to the relay control device; And a standby power control module configured to generate a control signal for standby power and transmit the generated control signal to the relay control device. Including but not limited to: The relay control device opens and closes a specific capacitor in a capacitor bank based on the power factor control signal, sequentially cuts a contact to a circuit for each load based on a power control signal for the peak power, and A complex control device for a power system, characterized in that for opening and closing the contact of the standby power switching circuit based on the control signal. The method of claim 1, The relay control device is a composite control device for a power system, characterized in that it has 14 channels as a control port for automatic power factor control. The method of claim 2, The relay control device is selected from four, six, eight, ten, twelve, and fourteen circuits, and only the selected circuit is used as a circuit for power factor control. controller. The method of claim 1, The standby power control module monitors a power state corresponding to the power system at a predetermined period, and stores the monitored power state information in a memory. The method of claim 1, An output unit for outputting information for the user to specify settings for power factor control, peak power control and standby power control; An input unit for allowing the user to specify the set value Complex control device for a power system further comprising an input and output unit comprising a. The method of claim 5, And the information includes at least one of a voltage phase, a current phase and a power factor value. The method of claim 5, The power factor control signal is based on a user-specified power factor control setting value, the control signal for peak power is based on a user-specified peak power control setting value, and the control signal for standby power is user-specified standby. Complex control device for a power system, characterized in that it is generated based on the set value of the power control.

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