KR100429914B1 - Emergency generating system using flywheel - Google Patents

Abstract

The present invention relates to an emergency power generation system using a flywheel, and more specifically, the load and the flywheel are driven by the grid power supply in normal times, and when an abnormality occurs in the grid power supply, the rotational inertia of the flywheel is used for the first predetermined time. It supplies high-quality power to the load, and if the abnormality of the system power continues, the emergency power generation system using a flywheel to supply power to the load by driving the motor / generator unit.

To this end, the present invention provides a motor / generator unit, an engine for use as a mechanical energy source of the motor / generator unit, fastening means for coupling the engine and the motor / generator unit, and a field to the motor / generator unit. A field winding current supply device for supplying a current, a control device for controlling the motor / generator section, the engine and the fastening means, and a circuit power supply and the motor / generator section for the first start of an emergency power generation system. And a flywheel fastened to the motor / generator to maintain a voltage of the system power supply for a predetermined time in the event of a circuit breaker and the system power supply failure, and the control device also controls the circuit breaker.

Description

Emergency generating system using flywheel

The present invention relates to an emergency power generation system using a flywheel, and more specifically, the load and the flywheel are driven by the grid power supply in normal times, and when an abnormality occurs in the grid power supply, the rotational inertia of the flywheel is used for the first predetermined time. It supplies high-quality power to the load, and if the abnormality of the system power continues, the emergency power generation system using a flywheel to supply power to the load by driving the motor / generator unit.

Recently, due to explosive use of the Internet, high-quality power supply is required. However, transmission / distribution facilities such as the main power supply system alone cannot effectively cope with system accidents such as power failure or instantaneous low voltage, and in reality, it is impossible to completely eliminate such system accidents. Therefore, emergency generators or uninterruptible power supply (UPS) equipment is used to cope with abnormalities in system power supply such as power failure or instantaneous low voltage. 1 is a block diagram of a general UPS equipment, a filter 1 for removing noise mixed in a power supply voltage, and a rectifier 2 for outputting a DC voltage by filtering an output voltage of the filter 1. And a chopper (3) for floating-charging the battery (BATT) by limiting and stabilizing the output current of the rectifier (2), an inverter (4) for converting the output voltage of the chopper into a square wave, and the inverter ( Insulating transformer 5 to insulate the output of 4), rectifier 6 for rectifying the output voltage of the insulating transformer 5 to a DC voltage, and a filter for removing noise mixed in the output of the rectifier 6. (7), an inverter (8) for switching the output voltage of the filter to output an AC voltage mixed with harmonics, and a filter (9) for outputting a sine wave by filtering the output voltage of the inverter to remove harmonics. It is.

However, the general UPS equipment as described above has the problem that not only the explosive gas may be generated during the charging and discharging process but also requires a lot of space during installation. In addition, the UPS equipment is expensive and puts an economic burden, and even if you want to implement a system, the system is not only difficult to increase the capacity due to the complexity of the capacity, it is difficult to put to practical use because it is difficult to increase the pressure. In addition, the emergency generator for supplying power at the necessary moment through a separate power supply is used as the cost of the blackout charge, so it can not efficiently cope with the momentary low voltage situation, there is a problem that parallel operation with the grid power supply is impossible.

The present invention was devised to solve the above problems, and by using a flywheel, which is a mechanical energy storage device, rather than an electrical energy storage device, it is possible to more effectively cope with an unstable state of a system power supply such as an instantaneous voltage drop or a power failure. The purpose is to provide an emergency power generation system.

In addition, it is possible to minimize the installation space compared to the existing UPS equipment, and to provide an emergency power generation system that can reduce the cost.

In addition, through the engine and motor / generator set, emergency power generation is possible in case of power failure, and when power demand surges even in the absence of power failure, an excessive power demand can be shared with the system power to save electricity costs. The purpose is to provide a power generation system.

1 is a block diagram of a typical UPS equipment,

2 is a block diagram of an emergency power generation system using a flywheel according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: engine

20: clutch

30: motor / generator section

31: field winding current supply device

40: flywheel

50: circuit breaker

60 control device

61: communication module

62: circuit breaker control device

63: engine governor

64: clutch control device

65: grid power supply voltage / phase measurement unit

66: motor / generator part output voltage / phase measurement part

67: motor / generator unit rotational speed measurement unit

70: load

80: grid power

90: external device

100: engine-motor / generator set

In order to achieve the above object, the present invention provides a motor / generator section, an engine for use as a mechanical energy source of the motor / generator section, fastening means for fastening the engine and the motor / generator section, and A field winding current supply device for supplying a field current to a motor / generator section, a control device for controlling the motor / generator section, the engine and the fastening means, and a system power source and the motor / A circuit breaker for shutting off the generator section and a flywheel fastened to the motor / generator section to maintain the voltage of the system power supply for a predetermined time in the event of a system power failure, wherein the control device controls the circuit breaker to also control. It features.

Preferably, the fastening means is characterized in that the clutch is fastened by an electrical signal.

Preferably, the motor / generator unit operates as a motor during normal operation, and operates as a generator when a system power failure occurs.

Preferably, the flywheel has a predetermined rotational inertia so that the fastening means does not decrease below a predetermined rotational speed until the fastening means is closed and power supply by the engine starts.

Preferably, the control device includes a circuit breaker control device for shutting off the system power supply and the motor / generator section at the first startup of the uninterruptible power supply system, an engine governor for starting the engine in the event of a system power failure. A fastening means control device for controlling the fastening means for transmitting power of the engine to the motor / generator part, a system power voltage and phase measuring unit for measuring the voltage and phase of the system power source, and the motor / And a motor / generator unit output voltage and phase measuring unit for measuring the output voltage and the phase of the generator unit, and a motor / generator unit rotational speed measuring unit for measuring the rotational speed of the motor / generator unit.

Preferably, it further comprises an external device for remote control and monitoring from the outside.

Preferably, the control device further comprises a communication module for communication with the external device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an emergency power generation system system using a flywheel according to the present invention. As shown, the present invention consists of an engine-motor / generator set, a control device, a circuit breaker, and an external device. The engine-motor / generator unit set includes an engine, a clutch, which is an example of a fastening means, a motor / generator unit, and a flywheel. Towing clutch control device, system power supply voltage / phase measurement unit, motor / generator section output voltage / phase measurement section, motor / generator section rotation speed measurement section.

The operation step according to the present invention is composed of a system initial start mode, a normal operation mode, a low voltage UPS mode, an engine start mode, a recovery mode to a normal state, and each step will be described in detail as follows.

In the system initial start-up mode, operation is performed when the uninterruptible power supply system using the flywheel of the present invention is first started. Specifically, the motor / generator part 30 is started by the engine 10 or an inverter (not shown) in the state in which the fastening means 20 is closed and the circuit breaker 50 is opened. The voltage is output. In this case, the voltage and phase measuring unit of the control device 60 measures the phase and voltage of the motor / generator unit 30 and the system power supply 80. As the engine speed increases, the output voltage of the motor / generator section increases, and when the output voltage and phase of the motor / generator section 30 coincide with the voltage and phase of the system power supply 80, the circuit breaker 50 is turned off. By closing the fastening means, the motor / generator section 30 is connected to the system power supply 80. After the system power supply 80 is connected, the motor / generator unit and the load are in the normal operation mode in which power is supplied from the system power supply.

In the normal operation mode, the system power source 80 operates in a state where there is no abnormality such as low voltage or power failure. In the normal operation mode, the motor / generator unit 30 operates as a motor and operates the flywheel 40 at a constant speed. Keeps turning. At this time, the necessary power is supplied from the system power supply 80, and the clutch 20, which is an example of the fastening means, is in an open state, so that the engine 10 and the motor / generator unit 30 are separated. In the normal operation mode, the voltage state of the system power is sensed by the control device 60.

The low voltage UPS mode is a step in which an abnormality occurs in the system power supply 80 such as low voltage or power failure. When viewed from the side of the load 70, the mechanical energy of the flywheel 40, which is rotating at a constant speed in the normal operation mode, is converted into electrical energy and supplied to the load 70, so that it is supplied to the load despite the instantaneous system power failure. There is no impact on the power being generated. In the system voltage sensing step, the clutch 20, which is an example of the engine 10 and the coupling means, does not operate at all.

In engine start mode, power is supplied to the load by the engine. That is, when the abnormal state of the system power supply 80 continues (for example, 1 second or more), the engine 10 is started. Until the engine 10 is started, as described in the low voltage UPS mode, mechanical energy due to the flywheel 40 inertia becomes a power source for turning the motor / generator section 30 and is generated by the motor / generator section 30. The applied voltage is applied to the load 70. Over time, the rotation speed of the flywheel 40 gradually decreases. When the rotational speed of the engine 10 reaches the rotational speed of the motor / generator part 30, the clutch 20 is closed to accelerate the motor / generator part with engine power to reach a normal speed, and the motor / generator part 30 The driving force is supplied from the engine 10. Since the electric power must be supplied to the load 70 by the flywheel 40 until the clutch 20 is closed and the power supply by the engine 10 starts from the moment when the low voltage or power failure occurs in the system power source 80, the flywheel ( The rotational inertia of the flywheel should be designed to be adequately large so that the rotational speed of 40) is not reduced below the appropriate speed.

In the recovery mode, when an abnormal state of the system power supply 80 such as a power failure or a low voltage state is restored, and the voltage of the system power supply 80 is restored to a normal state, the clutch 20 is opened and the engine 10 stops operating. At this point, the normal operation mode is restored.

The above description illustrates a preferred embodiment of the present invention, and the present invention is not limited thereto and may be variously modified. For example, by increasing the rotor inertia of the motor / generator section 30, the function of the uninterruptible power supply system can be sufficiently achieved without attaching the flywheel 40 separately.

As such, those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, by using a flywheel that is a mechanical energy storage device rather than an electrical energy storage device, it is possible to more effectively cope with an unstable state such as a drop in instantaneous voltage or power failure, and to minimize an installation space compared to a conventional UPS. As a result, the cost can be reduced.

In addition, through the engine-motor / generator set, emergency power generation is possible in case of power failure, and when electric power demand surges even in the absence of power failure, the electric power can be saved by sharing the excessive power demand with the power of the system. It works.

Claims (7)

Motor / generator section; An engine for use as a mechanical energy source of the motor / generator section; Fastening means for fastening the engine and the motor / generator part; A field winding current supply device for supplying a field current to the motor / generator; A control device for controlling the motor / generator section, the engine and the fastening means; A circuit breaker for shutting off the grid power supply and the motor / generator section at the first startup of the emergency power generation system; A flywheel fastened to the motor / generator to maintain the voltage of the grid power supply for a predetermined time when the grid power supply is abnormal; And External device for remote control and monitoring from the outside, The control device, A circuit breaker control device for disconnecting the grid power supply and the motor / generator section during initial startup of the uninterruptible power supply system; An engine governor for starting the engine when the system power is abnormal; A fastening means control device for controlling the fastening means for transmitting the power of the engine to the motor / generator section; A grid power supply voltage and phase measurement unit measuring voltage and phase of the grid power supply; A motor / generator section output voltage and phase measurement unit measuring the output voltage and phase of the motor / generator section; And It is provided with a motor / generator unit rotational speed measuring unit for measuring the rotational speed of the motor / generator unit, The control device is also an emergency power generation system using a flywheel, characterized in that for controlling the circuit breaker. The emergency power generation system using a flywheel according to claim 1, wherein the fastening means is a clutch fastened by an electrical signal. The emergency power generation system using a flywheel according to claim 1, wherein the motor / generator unit operates as a motor during normal operation and as a generator when a system power failure occurs. The flywheel of claim 1, wherein the flywheel has a predetermined rotational inertia such that the fastening means does not decrease below a predetermined rotational speed until the fastening means is closed and power supply by the engine starts. Emergency power system using. delete delete The emergency power generation system using a flywheel according to claim 1, wherein the control device further comprises a communication module for communicating with the external device.