KR102255475B1 - Container type inverter device for energy saving of motor for fan - Google Patents

Abstract

The present invention relates to a container-type inverter device for energy saving of a fan motor and an energy saving system using the same, and since the speed of the motor is adjusted according to the amount of air required by applying an inverter device to the fan motor, energy consumption can be reduced. , Since the inverter device is formed by the hardware including the inverter and the controller for its operation in the container, it is possible to minimize the change of the control system of the existing system, and the environment where the inverter device is located and the hardware installed inside the inverter device. The present invention relates to a container-type inverter device for energy saving of a fan motor capable of maximizing the operating efficiency of the inverter device by having a structure and equipment optimized for operation, and an energy saving system using the same.

Description

Container type inverter device for energy saving of motor for fan}

The present invention relates to a container-type inverter device for energy saving of a fan motor, and since the speed of the motor is adjusted according to the amount of air required by applying the inverter device to the fan motor, energy consumption can be reduced, and an inverter is included in the container. Since the inverter device is formed by the built-in hardware and the controller for its operation, it is possible to minimize the change of the control system of the existing system, and the structure optimized for the operation of the environment in which the inverter device is located and the hardware installed inside the inverter device. The present invention relates to a container-type inverter device for energy saving of a fan motor capable of maximizing the operating efficiency of the inverter device with facilities.

Thermal power plants using coal generate steam by burning pulverized coal in a burner and use this to generate electricity. Air is supplied to the burner using a fan for transport and combustion of the pulverized coal.

1 is a reference diagram for explaining a conventional process of supplying air to a burner using a fan. Hereinafter, a conventional method for controlling the amount of air supplied to a burner of a thermal power plant with reference to FIG. 1 and the following patent documents Let's look at.

<Patent Literature>

Patent No. 10-1412514 (registered on June 20, 2014) "Pulverized coal supply control system of thermal power plant"

Air is supplied to the burner of the thermal power plant by supplying AC commercial power to the motor 200 connected to the distribution panel 100 under the control of the distributed controller 600 so that the motor 200 is driven and the fan 300 rotates. However, the thermal power plant has an output required at a specific point in time, and the amount of air supplied to the burner for the desired output is adjusted. The amount of air supplied to the burner is controlled by the distributed controller 600 to control the operation of the air volume control device 500 (for example, a damper, etc.) that adjusts the degree of opening of the air transfer path 400 while the fan 300 is operating as described above. It is done under control.

As previously seen, the amount of air supplied to the burner is controlled by adjusting the degree of opening of the air transfer path 400 while the motor 200 is operating in full. In terms of being driven by starting, energy required for the operation of the motor 200 increases, and thus there is an inefficient problem. Therefore, an inverter (not shown) is installed between the distribution board 100 and the motor 200 so that the motor 200 is not always fully operated and the speed of the motor 200 is adjusted according to the required amount of air. It may be considered to supply power to have the speed of the motor 200 suitable for the amount of air, but the installation of the inverter and the hardware for its operation in the internal space of the thermal power plant control room is subject to space constraints, and the distributed controller 600 is a thermal power plant. In terms of controlling the overall operation of the inverter and the hardware for its operation, the change of the control method of the distributed controller 600 due to the use of the inverter has a difficult problem in reality.

The present invention was devised to solve the above problems,

An object of the present invention is to provide a container-type inverter device for energy saving of a fan motor capable of reducing energy consumption by adjusting the speed of the motor according to the amount of air required by applying an inverter device to the fan motor.

In addition, the present invention provides a container-type inverter device for energy saving of a fan motor that can minimize changes in the control system of the existing system because hardware including an inverter and a controller for its operation are built in the container to form an inverter device. It has its purpose to provide.

In addition, the present invention is a container type for energy saving of a fan motor capable of maximizing the operation efficiency of the inverter device by having a structure and equipment optimized for the operation of the environment in which the inverter device is located and the hardware installed inside the inverter device. Its purpose is to provide an inverter device.

In addition, the present invention provides a container type inverter device for energy saving of a fan motor capable of preventing damage to the inverter without stopping the plant when switching between the commercial power mode and the inverter mode for controlling the amount of air. There is a purpose.

In addition, an object of the present invention is to provide a container-type inverter device for energy saving of a fan motor capable of minimizing fluctuations in air volume that may occur when air volume adjustment is suddenly performed in a commercial power mode due to damage to the inverter. .

The present invention is implemented by an embodiment having the following configuration in order to achieve the above object.

According to an embodiment of the present invention, a container-type inverter device according to the present invention includes a container forming an outer shape; An inverter located in the container and installed on a main line connecting the distribution board and the motor to change a frequency of commercial power under the control of a controller and supply it to the motor; A switchgear located in the container and opening and closing a line between the distribution panel and the motor under the control of a controller so that power or commercial power output by the inverter is supplied to the motor; A holding device for adjusting the internal environment of the container; And a controller that is located in the container and controls the power supplied to the motor so as to generate a desired amount of air by exchanging information with the distributed controller.

According to another embodiment of the present invention, the container-type inverter device according to the present invention is formed in a sealed type integral type, is connected to each of the distribution board and the motor by cables, and performs wired or wireless communication with the distributed controller, so that dust It is characterized in that it is possible to install outdoors in a plant where a lot of this occurs.

According to another embodiment of the present invention, in the container-type inverter device according to the present invention, the holding device includes an air conditioner that regulates temperature and humidity inside the container, and heat generated from the inverter by being installed around the inverter to a container. It characterized in that it comprises a blower to disperse inside, and a fire sensor installed inside the container to sense whether a fire has occurred.

According to another embodiment of the present invention, an energy saving system according to the present invention includes a distribution board for supplying commercial power; A container type inverter device positioned between the distribution board and the motor to supply commercial power to the motor or to supply the motor by changing a frequency of the commercial power to adjust the speed of the motor; A motor that rotates a fan by being driven by power supplied from the container-type inverter device; A fan rotating by the driving force of the motor to flow air; An air volume control device for adjusting the degree of opening of the air transfer path in communication with the fan; Including a distributed controller for transmitting information on the amount of air required to the container-type inverter device and controlling the air volume control device according to power information supplied to the motor by the container-type inverter device, wherein the container-type inverter device comprises: The container-type inverter device according to any one of claims 3 to 3 is used.

According to another embodiment of the present invention, in the energy saving system according to the present invention, the inverter changes the frequency of the commercial power supply to the motor according to the control signal of the controller, thereby controlling the speed of the motor. And, a synchronization unit that matches the frequency, voltage and phase of the power output from the inverter with the frequency, voltage, and phase of the commercial power when switching between the commercial power mode and the inverter mode for controlling the amount of air under the control of the controller. , A sensor unit for sensing and outputting power output from the inverter, wherein the switch is located on the main line between the distribution board and the inverter and operates under the control of the controller to open and close the main line in front of the inverter, and the inverter An output switch located on the main line between the motor and the motor and operated under the control of the controller to open and close the main line at the rear end of the inverter, and one end is connected to the main line between the distribution board and the input switch, and the other end is the main line between the output switch and the motor. It characterized in that it comprises a bypass switch that is located on the bypass line connected to the road and operates under the control of the controller to open and close the bypass line.

According to another embodiment of the present invention, in the energy saving system according to the present invention, the controller supplies commercial power to the motor so that the inverter device is a motor that is required instead of the commercial power in a state in which the motor is running. An inverter mode conversion unit that supplies power whose frequency is converted according to the speed of the motor to be converted into an operating state, and the power source whose frequency is converted according to the speed of the motor required by the inverter device is supplied to the motor. A commercial power mode switching unit that controls the inverter device to supply commercial power to the motor and converts it into an operating state while the motor is operating, and the inverter operates while air volume is being adjusted in the inverter mode. Is stopped, and includes a disturbance control unit that minimizes sudden fluctuations in air volume that may occur when switching to the commercial power mode, and the inverter mode conversion unit is in a state in which the air volume is controlled in the commercial power mode, and the distributed controller is in the inverter mode. A confirmation module that checks when a signal to control is output and outputs an inverter mode conversion signal, and an input module that turns on an input switch and supplies commercial power to the inverter when the inverter mode conversion signal is output from the confirmation module. And, a synchronization module that operates the synchronization unit when commercial power is supplied to the inverter under the control of the input module so that the frequency, voltage, and phase of the power output from the inverter are the same as the frequency, voltage, and phase of the commercial power; When the frequency, voltage, and phase of the power output from the inverter and the commercial power are the same under the control of the synchronization module, the supply module is turned on so that the power output from the inverter is supplied to the motor, and the supply module A blocking module that turns off the bypass switch so that only the power output from the inverter is supplied to the motor while the power output from the inverter and the commercial power are supplied to the motor under the control of In the state that only the power is supplied to the motor, the speed controller is controlled to change according to the required motor speed. It includes a speed control module that allows power having a hard frequency to be supplied to the motor and outputs information on the power supplied to the motor to a distributed controller in real time, and when an operation signal is output from the speed control module, the speed control The part lowers the frequency of the power output from the inverter to reach the target frequency.At this time, information about the power supplied to the motor is output to the distributed controller in real time. It is characterized in that the transfer path is opened.

According to another embodiment of the present invention, in the energy saving system according to the present invention, the commercial power mode switching unit outputs a signal indicating that the distributed controller is to switch to the commercial power mode while the air volume is controlled in the inverter mode. In this case, a signal output module that checks this and outputs a commercial power mode conversion signal, and when a commercial power mode conversion signal is output from the signal output module, the synchronization unit is operated so that the frequency, voltage, and phase of the power output from the inverter are commercially available. A matching module that makes the frequency, voltage, and phase of the power the same and outputs information on the power supplied to the motor by the inverter to the distributed controller in real time, and the power output from the inverter under the control of the matching module. When the frequency, voltage and phase of the and commercial power are the same, the supply module turns on the bypass switch to supply the commercial power to the motor, and the power and commercial power output from the inverter are combined with the motor by the control of the supply module. It includes a removal module that turns off the input switch and the output switch while being supplied to the motor so that only commercial power is supplied to the motor through a bypass line, and when an operation signal is output from the matching module, the synchronization unit The frequency is increased sequentially to make it the same as the frequency of the commercial power, and then the voltage and phase are adjusted so that the frequency, voltage, and phase of the power output from the inverter and the commercial power are the same. Since the information is output to the distributed controller in real time, the distributed controller controls the air volume control device according to the increase in the speed of the motor so that the air transport path is closed, and the disturbance controller checks the information of power output from the sensor unit of the inverter, A sensing confirmation module that determines whether the operation of the inverter has stopped while the air volume is being adjusted in the inverter mode, and when the inverter stop information is output from the sensing confirmation module, the input switch is turned off to prevent commercial power from being supplied to the inverter. , A control transmission module that transmits information that the inverter is stopped to a distributed controller, and an inverter in the sensing confirmation module. When the motor stop information is output, a calculation module that determines when to supply commercial power to the motor so that the air volume fluctuates within a certain upper and lower limit range of the required air volume, and after the delay time calculated by the calculation module elapses. It includes an open module for supplying commercial power to the motor by turning on the bypass switch, and the distributed controller receiving the inverter stop information immediately controls the air volume control device so that the air transfer path is further closed according to the required amount of air. And, the calculation module calculates the delay time from the point when the inverter stops to the point when the commercial power is supplied, and the delay time is the amount of air required, the speed of the fan and the amount of air by supplying the commercial power and driving the motor. It is determined in consideration of the speed at which the device operates and closes the air transport path, and the amount of air supplied during the delay time decreases and is supplied within the lower limit of the required amount of air, and the amount of air supplied until the fan speed reaches the maximum after the delay time. It is characterized in that the increased amount of air is supplied within the upper limit range of the required amount of air.

The present invention can obtain the following effects by the above embodiment.

The present invention applies an inverter device to a fan motor to adjust the speed of the motor according to the amount of air required, thereby reducing energy consumption.

In addition, according to the present invention, since hardware including an inverter and a controller for its operation are built into the container to form an inverter device, there is an effect of minimizing changes in the control system of the existing system.

In addition, the present invention is equipped with a structure and equipment optimized for the operation of the environment in which the inverter device is located and the hardware installed inside the inverter device, there is an effect of maximizing the operating efficiency of the inverter device.

In addition, the present invention has the effect of preventing damage to the inverter without stopping the plant when switching between the commercial power mode and the inverter mode for controlling the amount of air.

In addition, the present invention has an effect of minimizing fluctuations in air volume that may occur when air volume adjustment is suddenly performed in the commercial power mode due to damage to the inverter.

1 is a reference diagram for explaining a conventional process of supplying air to a burner using a fan.
2 is a block diagram of an energy saving system according to an embodiment of the present invention.
3 is a partial cut-away plan view of the inverter device of FIG. 2.
Figure 4 is a block diagram of the main part of the inverter device of Figure 2;
5 is a block diagram showing a detailed configuration of the inverter of FIG. 4;
6 is a block diagram showing a detailed configuration of the controller of FIG. 4;
Figure 7 is a block diagram showing a detailed configuration of the inverter mode switching unit of Figure 6;
Figure 8 is a block diagram showing a detailed configuration of the commercial power mode switching unit of Figure 6;
Figure 9 is a block diagram showing a detailed configuration of the disturbance control unit of Figure 6;
Figure 10 is a reference diagram for explaining the operation process of the inverter mode switching unit of Figure 6;
Figure 11 is a reference diagram for explaining the operation process of the commercial power mode conversion unit of Figure 6;
Figure 12 is a reference diagram for explaining the operation process of the disturbance control unit of Figure 6;

Hereinafter, preferred embodiments of a container type inverter device for energy saving of a fan motor according to the present invention and an energy saving system using the same will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, and other components are not excluded unless specifically stated to the contrary, and also described in the specification. Terms such as "... unit" and "... module" mean a unit that processes at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

2 is a block diagram of an energy saving system according to an embodiment of the present invention, FIG. 3 is a partial cut-away plan view of the inverter device of FIG. 2, and FIG. 4 is a block diagram of essential parts of the inverter device of FIG. 2, and FIG. 5 is FIG. 4 is a block diagram showing a detailed configuration of the inverter of FIG. 4, FIG. 6 is a block diagram showing a detailed configuration of the controller of FIG. 4, FIG. 7 is a block diagram showing a detailed configuration of the inverter mode switching unit of FIG. 6, and FIG. Fig. 6 is a block diagram showing a detailed configuration of the commercial power mode switching unit, Fig. 9 is a block diagram showing the detailed configuration of the disturbance control unit of Fig. 6, and Fig. 10 is a diagram illustrating an operation process of the inverter mode switching unit of Fig. 6 FIG. 11 is a reference diagram for explaining the operation process of the commercial power mode conversion unit of FIG. 6, and FIG. 12 is a reference view for explaining the operation process of the disturbance control unit of FIG. 6.

When an energy saving system using a container-type inverter device for energy saving of a fan motor according to an embodiment of the present invention will be described with reference to FIGS. 2 to 12, the energy saving system includes a distribution board 100 for supplying commercial power and , A container type that is located between the distribution board 100 and the motor 200 and supplies commercial power to the motor 100 or changes the frequency of the commercial power and supplies it to the motor 200 to control the speed of the motor 200 An inverter device 1 and a motor 200 that rotates the fan 300 by driving by power supplied from the container-type inverter device 1, and the motor 200 rotates by the driving force of the motor 200 to flow air. The fan 300 to be used, the air volume control device 500 for controlling the degree of opening of the air transfer path 400 in communication with the fan 300, and information on the required amount of air to the container-type inverter device 1 And a distributed controller 600 that transmits and controls the air volume control device 500 when the container-type inverter device 1 supplies commercial power. The energy saving system can be applied to various plants such as power plants and chemical plants in which a motor that operates a fluid supply device (fan, pump, etc.) is used, but hereinafter the energy saving system is installed in a thermal power plant to control the amount of air. The case will be described with an example. As described above, the control of the amount of air supplied to the thermal power plant (burner) is made by a system that adjusts the degree of opening of the air transfer path 400 in a state in which the motor 200 operates in full, the present invention In the state of maintaining the above system, the container type inverter device 1 is installed between the distribution board 100 and the motor 200, and the container type inverter device 1 and the distributed controller 600 exchange information with each other. Since the air volume is adjusted, hereinafter, only the configuration different from the conventional system will be described in detail.

The container-type inverter device 1 is located between the distribution board 100 and the motor 200 to supply commercial power to the motor 100, or by changing the frequency of the commercial power to supply the motor 200 to the motor 200 ), the container 11 forming the outer shape, the inverter 12, the switch 13, the holding device 14, the power supply unit 15 and And a controller 16 and the like. Installation of the inverter device 1 is difficult due to a small space in the electric room in which various electrical facilities are installed.The inverter device 1 is formed in a sealed type and connected to the distribution board 100 and the motor 200 by cables. In addition, since wired or wireless communication with the distributed controller 600 can be performed, it is possible to install outdoors in a thermal power plant where a lot of dust is generated, so that the container type inverter device 1 can be installed out of space constraints. have.

The container 11 forms the outer shape of the inverter device and is configured to accommodate the inverter 12, the switch 13, the holding device 14, the power supply unit 15 and the controller 16, and has a certain shape, but is preferable. It has a rectangular parallelepiped shape and is made of iron plates. A door 111 may be formed on one side of the container 11 to allow access to the inside of the container 11.

The inverter 12 is installed on the main line 700 connecting the distribution panel 100 and the motor 200 to change the frequency of commercial power under the control of the controller 16 to be supplied to the motor 200 A configuration that enables adjustment of the speed of the motor 200, and includes a speed control unit 121, a synchronization unit 122, a sensor unit 123, and the like.

The speed control unit 121 is configured to adjust the speed of the motor 200 by changing the frequency of the commercial power (60Hz) according to the control signal of the controller 16 and supplying it to the motor 200. As in the prior art, the commercial power is not always supplied to the motor 200, but the speed control unit 121 changes the frequency of the commercial power according to the required speed of the motor 200 and supplies it to the motor 200, for example When the required amount of air is lower than the maximum capacity, power having a frequency lower than that of commercial power can be supplied to the motor 200, thereby saving energy.

When switching between the commercial power mode and the inverter mode for controlling the amount of air according to the control of the controller 16, the synchronization unit 122 converts the frequency, voltage, and phase of the power output from the inverter 12 to that of the commercial power. It is a configuration that matches frequency, voltage and phase.

The sensor unit 123 senses and outputs power output from the inverter 12.

The switch 13 opens and closes the line between the distribution panel 100 and the motor 200 under the control of the controller 16 so that the power or commercial power output by the inverter 12 is supplied to the motor 200. In the configuration, it includes an input switch 131, an output switch 132, a bypass switch 133, and the like. For example, the switch 13 may be a vacuum circuit breaker. As shown in FIG. 3, the input switch 131 is separately modularized and installed, and the output switch 132 and the bypass switch 133 are installed in one case to be integrally modularized.

The input switch 131 is located on the main line 700 between the distribution board 100 and the inverter 12 and operates under the control of the controller 16 to open and close the main line 700 in front of the inverter 12. Configuration.

The output switch 132 is located on the main line 700 between the inverter 12 and the motor 200 and operates under the control of the controller 16 to open and close the main line 700 at the rear end of the inverter 12. Configuration.

The bypass switch 133 has one end connected to the main line 700 between the distribution board 100 and the input switch 131, and the other end connected to the main line 700 between the output switch 132 and the motor 200 It is located on the bypass line 800, which is operated under the control of the controller 16 to open and close the bypass line 800. The inverter mode refers to a control state in which the inverter 12 controls the speed of the motor 200 to generate a required amount of air, that is, the bypass switch 133 is turned off and the input switch 131 and the output switch 132 When the inverter 12 is turned on, the inverter 12 controls the speed of the motor by adjusting the frequency of the power supplied to the motor 200 according to the control of the controller 16, thereby controlling the rotational speed of the fan to generate the required amount of air. Will be ordered. In the commercial power mode, the inverter device 1 supplies commercial power to the motor 200 and the distributed controller 600 controls the air volume control device 500 to change the degree of opening of the air transfer path 400. It means a control state for generating the amount of air, that is, the bypass switch 133 is turned on, the input switch 131 and the output switch 132 are turned off, and a distributed controller ( 600) controls the air volume control device 500 to change the degree of opening of the air transfer path 400 to generate the required amount of air. Accordingly, in the inverter mode, the inverter device 1 supplies power whose frequency is changed, and in the commercial power mode, the inverter device 1 supplies commercial power.

The holding device 14 is configured to adjust the internal environment of the container 11 so that the inverter device 1 can be efficiently operated, and an air conditioner 141, a blower 142, and a fire sensor 143 And the like.

The air conditioner 141 is configured to adjust the temperature and humidity inside the container 11, and the inverter device 1 is installed outdoors in a thermal power plant and is greatly affected by external environments such as temperature, humidity, and dust. The inverter device 1 is formed in a sealed type, and the temperature and humidity inside the container 11 are kept constant by using the air conditioner 141.

The blower 142 is installed around the inverter 12 to disperse the heat generated from the inverter 12 into the container 11, and the inverter 12 generates a lot of heat during its operation. Accordingly, since the operation efficiency is lowered, a blower 142 is installed around the inverter 12 to quickly dissipate the heat generated by the inverter 12.

The fire sensor 143 is installed inside the container 11 to sense whether a fire has occurred, and the information output from the fire sensor 143 is transmitted to the distributed controller 600 through the controller 16 It will be.

The power supply unit 15 is configured to supply power for the operation of the inverter 12, the switch 13, the holding device 14, the controller 16, etc. located inside the container 11.

The controller 16 is configured to exchange information with the distributed controller 600 to adjust power supplied to the motor 200 so that the desired amount of air can be generated, and the communication unit 161, the inverter mode unit 162, and the commercial Includes a power mode unit 163, an inverter mode conversion unit 164, a commercial power mode conversion unit 165, a disturbance control unit 166, a holding unit 167, a storage unit 168, a control unit 169, etc. do.

The communication unit 161 is a component for exchanging information on air volume control with the distributed controller 600.

The inverter mode unit 162 supplies power whose frequency is converted according to the speed of the motor 200 required by the inverter device 1 according to the information output from the distributed controller 600 to the motor 200 In the configuration to control the bypass switch 133 is turned off and the input switch 131 and the output switch 132 are turned on, by controlling the speed control unit 121 of the inverter 12 to control the motor 200 The power whose frequency is converted according to the speed of is supplied to the motor 200.

The commercial power mode unit 163 is configured to control the inverter device 1 to supply commercial power to the motor 200 according to the information output from the distributed controller 600, and the bypass switch 133 When the input switch 131 and the output switch 132 are turned on, commercial power is continuously supplied to the motor 200. In the above state, since the motor 200 is fully operated, the dispersion controller 600 controls the operation of the air volume control device 500 to adjust the degree of opening of the air transfer path 400 to control the amount of air.

In a state in which the inverter device 1 supplies commercial power to the motor 200 and the motor 200 is in operation, the inverter mode conversion unit 164 is a motor requiring the inverter device 1 instead of the commercial power source. A configuration in which power, whose frequency is converted according to the speed of 200, is supplied to the motor 200 so that the motor 200 is converted into an operating state, that is, power supply to the motor 200 is supplied to the motor 200 in the commercial power mode. This is a configuration that converts to inverter mode. The inverter mode conversion unit 164 includes a confirmation module 164a, an input module 164b, a synchronization module 164c, a supply module 164d, a cut-off module 164e, a speed control module 164f, and the like. Turning off the bypass switch 133 so that the commercial power mode unit 163 is operated and the air amount is adjusted in the commercial power mode, and the inverter mode unit 162 is immediately operated so that the air amount is adjusted in the inverter mode. When the inverter 12 is operated by turning on the input switch 131 and the output switch 132, the motor 200 rotates even if commercial power is not supplied to the motor 200, and thus induced current Is generated, the frequency of the power output from the inverter 12 and the induced current generated when the motor 200 rotates is different, so that the inverter 12 is short-circuited (to prevent a short circuit, the motor 200) It may be considered to generate the inverter 12 after completely stopping), but this is not possible because it means stopping the plant), in the present invention, after the inverter mode conversion unit 164 switches from the commercial power mode to the inverter mode The inverter mode unit 162 operates to control the speed of the motor.

When the distribution controller 600 outputs a signal to control the amount of air in the inverter mode while the air amount is adjusted in the commercial power mode, the confirmation module 164a checks this and outputs an inverter mode conversion signal.

The input module 164b turns on the input switch 131 when the inverter mode conversion signal is output from the confirmation module 164a so that commercial power is supplied to the inverter 12 as well.

When commercial power is supplied to the inverter 12 under the control of the input module 164b, the synchronization module 164c operates the synchronization unit 122 to determine the frequency, voltage, and phase of the power output from the inverter 12. It is a configuration to be the same as the frequency, voltage and phase of this commercial power supply. When the operation signal is output from the synchronization module 164c, the synchronization unit 122 sequentially increases the frequency of the power output from the inverter 12 as shown in FIG. 10 to make it the same as the frequency of the commercial power supply. The voltage and phase are adjusted so that the frequency, voltage, and phase of the power output from the inverter 12 and the commercial power supply are the same.

When the frequency, voltage, and phase of the power output from the inverter 12 and the commercial power are the same under the control of the synchronization module 164c, the supply module 164d turns on the output switch 132 to turn on the inverter. The power output from (12) is supplied to the motor 200. The supply module 164d checks the information of the power output from the sensor unit 123 to check whether the power output from the inverter and the commercial power are synchronized, and the output switch ( Since 132 is turned on, power and commercial power output from the inverter are supplied to the motor 200 through the main line and the bypass line.

The cut-off module 164e turns off the bypass switch 133 while the power output from the inverter and the commercial power are supplied to the motor 200 together under the control of the supply module 164d. It is to be supplied to the motor 200.

The speed control module 164f is required by controlling the speed control unit 121 in a state in which only the power output from the inverter 12 is supplied to the motor 200 under the control of the cut-off module 164e. Power having a frequency changed according to the speed of the motor is supplied to the motor, and information on the power supplied to the motor is output to the distributed controller 600 in real time. When an operation signal is output from the speed control module 164f, the speed control unit 121 sequentially lowers the frequency of the power output from the inverter 12 as shown in FIG. 10 to reach a target frequency, At this time, since information on the power supplied to the motor 200 is output to the distributed controller 600 in real time, the distributed controller 600 controls the air volume control device 500 in accordance with the speed decrease of the motor 200 to control the air transport path. Make 400 more open.

The commercial power mode conversion unit 165 is a state in which the inverter device (1) supplies power whose frequency has been converted according to the required speed of the motor 200 to the motor 200 to operate the motor 200 In the configuration in which the inverter device 1 supplies commercial power to the motor 200 to convert the motor 200 into an operating state, that is, the power supply to the motor 200 is changed from the inverter mode to the commercial power mode. It is a conversion configuration. The commercial power mode conversion unit 165 includes a signal output module 165a, a matching module 165b, a providing module 165c, a removal module 165d, and the like. When the inverter 12 needs to be inspected or replaced, it is necessary to switch the air volume control from the inverter mode to the commercial power mode. Commercial power to the motor 200 by turning off the input switch 131 and the output switch 132 and turning on the bypass switch 133 so that the amount of air can be adjusted in the commercial power mode by operating the commercial power mode unit 163. In the case of supplying, since a failure may occur in the system due to a sudden increase in the amount of air, the present invention allows the commercial power mode conversion unit 165 to switch from the inverter mode to the commercial power mode.

When the signal output module 165a outputs a signal indicating that the distributed controller 600 will switch to the commercial power mode while the air volume is being adjusted in the inverter mode, it checks this and outputs a commercial power mode conversion signal.

When the signal output module 165a outputs a commercial power mode conversion signal, the matching module 165b operates the synchronization unit 122 so that the frequency, voltage, and phase of the power output from the inverter 12 are commercially available. The frequency, voltage, and phase of the power supply are the same, and information on the power supplied to the motor 200 by the inverter 12 is output to the distributed controller 600 in real time. When an operation signal is output from the matching module 165b, the synchronization unit 122 sequentially increases the frequency of the power output from the inverter 12 as shown in FIG. 11 to be the same as the frequency of the commercial power supply, Thereafter, the voltage and phase are adjusted so that the frequency, voltage, and phase of the power output from the inverter 12 and the commercial power supply are the same. At this time, since information on the power supplied to the motor 200 is output to the distributed controller 600 in real time, the distributed controller 600 controls the air volume control device 500 in accordance with the increase in the speed of the motor 200 to transport air. The furnace 400 is further closed.

When the frequency, voltage, and phase of the power output from the inverter 12 and the commercial power are the same under the control of the matching module 155b, the providing module 165c turns on the bypass switch 133 to be used for commercial use. Power is supplied to the motor 200. The providing module 165c checks the information of the power output from the sensor unit 123 to check whether the power output from the inverter and the commercial power are synchronized, and the bypass switch ( Since 133 is turned on, power and commercial power output from the inverter are supplied to the motor 200 through the main line and the bypass line.

The removal module 165d turns off the input switch 131 and the output switch 132 while the power output from the inverter and the commercial power are supplied to the motor 200 together under the control of the providing module 165c. Only commercial power is supplied to the motor 200 through the bypass line 800.

The disturbance control unit 166 is configured to minimize the sudden change in the amount of air that may occur when the operation of the butter 12 while the air volume is adjusted in the inverter mode is stopped, and changes to the commercial power mode, and a sensing confirmation module ( 166a), an adjustment transmission module 166b, a calculation module 166c, an open module 166d, and the like. When the inverter 12 is stopped due to a failure or the like while the inverter mode unit 162 operates and the air volume is adjusted in the inverter mode, the amount of air required in the commercial power mode is supplied to prevent the operation of the thermal power plant from being stopped. However, if the commercial power is supplied immediately after the inverter fails and the air volume is adjusted in the commercial power mode by operating the air volume control device, the motor rapidly increases due to the supply of the commercial power, whereas the air volume control device 500 operates The speed is relatively slow, and as shown in (a) of FIG. 12, the amount of air generated by the fan becomes significantly greater than the amount of air reduced by closing the air transfer path by the operation of the air volume control device 500, A much larger amount of air is supplied to the burner of the thermal power plant than the amount of air required during the period. Air must be supplied to the burner in a range above and below the required amount of air. When switching from the inverter mode to the commercial power mode as above, air that is temporarily outside the range of the required amount of air is supplied to the burner to prevent the operation of the thermal power plant. It causes problems. Accordingly, the present invention minimizes the sudden fluctuation of the amount of air that may occur when the disturbance prevention unit 166 is in the inverter mode while the operation of the inverter 12 is stopped while the air amount is adjusted in the inverter mode, and the burner Make sure the air is supplied within the range of the amount of air required for

The sensing confirmation module 166a checks information of power output from the sensor unit 123 of the inverter 12, and determines whether the operation of the inverter 12 has stopped while the air volume is being adjusted in the inverter mode. As a result, when power information is not output from the sensor unit 123, information indicating that the inverter has stopped is output.

When the inverter stop information is output from the sensing confirmation module 166b, the control transmission module 166b turns off the input switch 131 and the output switch 132 so that commercial power is not supplied to the inverter 12. , The information that the inverter is stopped is transmitted to the distributed controller 600. Upon receiving the inverter stop information, the distributed controller 600 immediately controls the air volume control device 500, as shown in (b) of FIG. 12, so that the air transfer path is further closed according to the required air volume.

When the inverter stop information is output from the sensing confirmation module 166b, the calculation module 166c causes the motor 200 to fluctuate in the amount of air within the range of the required amount of air (for example, 10% above and below the required amount of air). ) To determine the time to supply commercial power, that is, the delay time (Td) from the time the inverter stops to the time to supply the commercial power. The delay time is calculated according to a preset standard stored in the storage unit, and takes into account the required amount of air, the speed of the fan when driving the motor by supplying commercial power, and the speed at which the air volume control device operates and closes the air transfer path. For example, when the speed of the fan increases rapidly and the speed of closing the air passage is relatively slow, the delay time becomes longer.

The open module 166d is configured to turn on the bypass switch 133 after the delay time calculated by the calculation module 166c has elapsed so that commercial power is supplied to the motor 200. As shown in (b) of FIG. 12, as soon as the inverter is stopped, the air volume control device 500 is operated to further close the air transfer path, and commercial power is supplied to the motor after the delay time has elapsed, and the delay time During the period, the air volume is reduced and the air volume is increased until the fan speed is maximized after the delay time. That is, commercial power is supplied to the motor after the estimated delay time, rather than supplying commercial power immediately after the inverter stops. The supplied air volume is supplied within the lower limit of the required air volume and then within the upper limit of the required air volume.

The holding unit 167 is configured to control the operation of the holding device 14, and controls the air conditioner 141 to maintain temperature and humidity, controls the blower 142 to circulate air, and a fire sensor ( When a fire occurs by sensing the information output from 143), the information is transmitted to the distributed controller 600. The storage unit 168 stores information necessary for the operation of the inverter device 1 and information output from the inverter device 1. The control unit 169 controls the overall operation of the inverter device 1 and controls power supply to the motor. The inverter device 1 according to another embodiment of the present invention is installed on the main line 700 between the inverter 12 and the output switch 132 to remove circulating current from the power output from the inverter 12. It may further include a reactor (17).

The distributed controller 600 is configured to transmit information on the amount of air required to the container-type inverter device 1, and the container-type inverter device 1 controls the air volume control device 500 when commercial power is supplied, A transmission/reception unit (not shown) that transmits and receives information to and from the inverter device 1, a request unit (not shown) that generates information on the amount of air required according to a user's input signal and transmits it to the inverter device 1, the inverter And a controller (not shown) that controls the air volume control device 500 according to the power supply information output from the device 1 to control the degree of opening of the air transfer path 400. The distributed controller 600 performs only the control of the air volume control device 500 as in the prior art in controlling the air volume, and the controller of the inverter device performs the necessary control due to the use of the inverter, thus minimizing changes to the control system of the existing system. You can do it.

In the above, the applicant has described various embodiments of the present invention, but such embodiments are only one embodiment embodying the technical idea of the present invention, and any changes or modifications may be made as long as the technical idea of the present invention is implemented. It should be construed as falling within the scope of.

1: inverter unit 11: container 12: inverter
13: switch 14: holding device 15: power supply
16: controller 17: reactor 111: door
121: speed control unit 122: synchronization unit 123: sensor unit
131: input switch 132: output switch 133: bypass switch
141: air conditioner 142: blower 143: fire sensor
161: communication unit 162: inverter mode unit 163: commercial power mode unit
164: inverter mode switching unit 165: commercial power mode switching unit 166: disturbance control unit
167: maintenance unit 168: storage unit 169: control unit
164a: confirmation module 164b: input module 164c: synchronization module
164d: supply module 164e: cut-off module 164f: speed control module
165a: signal output module 165b: matching module 165c: provided module
165d: removal module 166a: sensing confirmation module 166b: control transmission unit
166c: calculation module 166d: open module

Claims (7)

delete delete delete A distribution board for supplying commercial power; A container-type inverter device positioned between the distribution panel and the motor to supply commercial power to the motor or to supply the motor by changing a frequency of the commercial power to adjust the speed of the motor; A motor that rotates a fan by being driven by power supplied from the container-type inverter device; A fan rotating by the driving force of the motor to flow air; An air volume control device for adjusting the degree of opening of the air transfer path in communication with the fan; Including; a distributed controller that transmits information on the amount of air required to the container-type inverter device and controls the air volume control device according to power information supplied to the motor by the container-type inverter device,
The container-type inverter device includes a container forming an outer shape; An inverter located in the container and installed on a main line connecting the distribution board and the motor to change a frequency of commercial power under the control of a controller and supply it to the motor; A switchgear located in the container and opening and closing a line between the distribution panel and the motor under the control of a controller so that power or commercial power output by the inverter is supplied to the motor; A holding device for adjusting the internal environment of the container; It is located in the container, and a controller for controlling the power supplied to the motor so that the desired amount of air can be generated by exchanging information with the distributed controller; and
The inverter includes a speed controller that adjusts the speed of the motor by changing the frequency of the commercial power supply to the motor according to the control signal of the controller, and the commercial power mode and inverter mode for controlling the amount of air according to the control of the controller. In the case of mutual switching, it includes a synchronization unit that matches the frequency, voltage, and phase of the power output from the inverter with the frequency, voltage, and phase of the commercial power supply, and a sensor unit that senses and outputs the power output from the inverter,
The switch is located on the main line between the distribution board and the inverter and operates under the control of the controller to open and close the main line in front of the inverter, and the switch is located on the main line between the inverter and the motor and operates under the control of the controller. The output switch that opens and closes the main line at the rear end, and one end is connected to the main line between the distribution board and the input switch, and the other end is located on the bypass line connected to the main line between the output switch and the motor, and operates under the control of the controller. Including a bypass switch for opening and closing the bypass line,
In a state in which the inverter device supplies commercial power to the motor and the motor is running, the inverter device supplies power whose frequency is converted according to the required speed of the motor instead of the commercial power source to the motor to operate the motor. Inverter mode conversion unit that controls to be converted into a state, and the inverter device supplies commercial power to the motor in a state in which the motor operates by supplying power whose frequency is converted according to the required motor speed to the motor. A commercial power mode conversion unit that controls the motor to be converted into an operating state, and the inverter stops operating while the air volume is being adjusted in the inverter mode, thereby minimizing sudden fluctuations in air volume that may occur when switching to the commercial power mode. It includes a disturbance control unit,
The inverter mode conversion unit checks when the distributed controller outputs a signal to control the air volume in the inverter mode while the air volume is adjusted in the commercial power mode, and outputs an inverter mode conversion signal; and the verification module In case the inverter mode conversion signal is output, the input switch is turned on to supply commercial power to the inverter, and when commercial power is supplied to the inverter under the control of the input module, the synchronization unit is operated and output from the inverter. A synchronization module that makes the frequency, voltage, and phase of the power equal to the frequency, voltage, and phase of the commercial power, and the frequency, voltage, and phase of the power output from the inverter and the commercial power under the control of the synchronization module are the same. If so, the output switch is turned on to supply the power output from the inverter to the motor, and the bypass switch is turned off while the power output from the inverter and the commercial power are supplied to the motor by the control of the supply module. In a state in which only the power output from the inverter is supplied to the motor, and only the power output from the inverter is supplied to the motor under the control of the cut-off module, the speed control unit is controlled to change according to the required motor speed. It includes a speed control module that allows power having a frequency to be supplied to the motor and to output information on the power supplied to the motor to the distributed controller in real time,
When the operation signal is output from the speed control module, the speed control unit lowers the frequency of the power output from the inverter to reach the target frequency. At this time, the information on the power supplied to the motor is output to the distributed controller in real time. Is an energy saving system, characterized in that the air flow path is opened by controlling the air volume control device in accordance with the reduction in the speed of the motor. delete delete The method of claim 4,
When the commercial power mode conversion unit outputs a signal indicating that the distributed controller is to switch to the commercial power mode while the air volume is adjusted in the inverter mode, the signal output module confirms the output and outputs a commercial power mode conversion signal, and the signal When the commercial power mode conversion signal is output from the output module, the synchronization unit is operated so that the frequency, voltage and phase of the power output from the inverter are the same as the frequency, voltage and phase of the commercial power, and supplied to the motor by the inverter. When the frequency, voltage, and phase of the power output from the inverter and the commercial power are the same according to the control of the matching module and the matching module that outputs information on the generated power to the distributed controller in real time, the bypass switch is turned on. A supply module that allows commercial power to be supplied to the motor, and commercial power through a bypass line by turning off the input switch and output switch while the power output from the inverter and the commercial power are supplied to the motor under the control of the provided module. It includes a removal module that allows only to be supplied to the motor,
When the operation signal is output from the matching module, the synchronization unit sequentially increases the frequency of the power output from the inverter to make it the same as the frequency of the commercial power, and then adjusts the voltage and phase to adjust the voltage and the phase of the power output and the commercial power. The frequency, voltage, and phase are made to be the same, and the information on the power supplied to the motor is output to the distributed controller in real time, so the distributed controller controls the air volume control device according to the increase in the speed of the motor so that the air transport path is closed. ,
The disturbance control unit checks the information of the power output from the sensor unit of the inverter, and determines whether the operation of the inverter is stopped while the air volume is being adjusted in the inverter mode, and the inverter stop information is displayed in the sensing check module. In the case of output, when the input switch is turned off so that commercial power is not supplied to the inverter, and the information that the inverter has stopped is transmitted to the distributed controller, and the inverter stop information is output from the sensing confirmation module, A calculation module that determines the timing of supplying commercial power to the motor so that the amount of air fluctuates within a certain upper and lower limit of the required air volume, and the bypass switch are turned on after the delay time calculated by the calculation module has elapsed. It includes an open module to supply commercial power,
Upon receiving the inverter stop information, the distributed controller immediately controls the air volume control device so that the air transfer path is further closed according to the required air volume,
The calculation module calculates the delay time from the time the inverter stops to the time the commercial power is supplied, and the delay time is the required amount of air, the speed of the fan and the air volume control device by supplying the commercial power and driving the motor. It is determined in consideration of the speed of operation and closing the air transport path,
The amount of air supplied during the delay time decreases and is supplied within the lower limit of the amount of air required, and then the amount of air supplied increases until the fan speed reaches the maximum after the delay time passes, and is supplied within the upper limit of the amount of air required. Energy saving system.

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