JP2015228777A - Power stable supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power stable supply system comprising a power generator capable of being used as not an emergency power supply but a permanent power supply.SOLUTION: There is provided a power generator system comprising a plurality of power generator units for generating power and a power combiner for combining power generated by the power generator units, where each power generator unit is connected to the power combiner and is capable of being replaced with another power generator unit. Preferably, the power generator system comprises a connector for supplying fuel to a power generator unit and a plurality of fuel containers for supplying fuel to the connector, where each fuel container is capable of being replaced with another fuel container.

Description

  The present invention relates to a generator system for stably supplying electric power.

  In an industrial facility such as a relatively large factory, a commercial power source is generally used as a permanent power source in order to stably supply power. When the commercial power source cannot be used for some reason, such as a power failure, a generator owned by a facility such as a factory is used as an emergency power source. Commercial power is widely used in developed countries and the frequency of power outages is low, but in developing countries and the like, there are many areas where the power dissemination is not progressing and there are many areas where power outages occur frequently.

  In developing countries where the supply of electric power from commercial power sources is likely to be disrupted, it is important from the viewpoint of stably operating factories to provide a mechanism that can continuously supply electric power by means other than commercial power sources. For example, in developing countries, when smelting metals and minerals in a furnace in a factory, if the power supply depends only on unreliable commercial power, the furnace will be cooled rapidly in the event of a power failure. Then, the metal in the furnace hardens, causing a problem that the furnace is damaged and the factory does not function.

  Therefore, in an area where power supply from a commercial power source is not stably performed, it is considered desirable to substitute a permanent power source with a generator that is not affected by a power failure, instead of using a permanent power source. Examples of such a generator include a generator that supplies a large amount of power, and a generator that attempts to continuously obtain a large amount of power by using a plurality of generators (see, for example, Patent Document 1). Conceivable.

JP2013-21966A

  However, the generator that supplies large electric power as described above has a problem that the generator itself is inferior in durability because the calorific value of the generator itself increases. Furthermore, there is a problem that if the generator breaks down, continuous power supply becomes impossible. In addition, the generator as described in Patent Document 1 has a special power source for efficiently driving the first stage motor among the power generation devices including a plurality of motors, and the structure of the power generation system. Since the above maintenance is inconvenient, it can be used as an emergency power source, but it is difficult to use as a permanent power source.

  The present invention comprises a plurality of generator units for generating power and a power combiner for combining the power generated in the generator unit, each generator unit being connected to a power combiner, The generator unit can be replaced with another generator unit.

  The present invention further includes a connector for supplying fuel to the generator unit and a plurality of fuel containers for supplying fuel to the connector, and the fuel containers can be replaced with other fuel containers, respectively. It is preferable that

  In the present invention, the generator unit further includes a generator, a rectifier, and an inverter, and AC power output from the generator is rectified to DC power by a rectifier connected to the generator, and output from the rectifier. DC power is converted into AC power by an inverter connected to a rectifier, AC power output from a plurality of inverters is combined by a power combiner connected to the plurality of inverters, It consists of an arbitrarily selected master inverter and other slave inverters, and information for eliminating the phase difference between the phase of AC power output from the master inverter and the phase of AC power output from the slave inverter is AC power output from the combiner to each slave inverter and output from the slave inverter The phase is preferably controlled to match the AC power of the phase output from the master inverter based on said information.

  The present invention further includes a main control circuit that monitors and controls the connector and / or the generator unit, and in the connector, the supply pressure of fuel from the fuel container to the connector, the internal pressure of the connector, and / or When the main control circuit detects an abnormality in the fuel supply pressure from the connector to the generator unit and / or in the generator unit, the main control circuit detects an abnormality in the engine temperature connected to the generator. At this time, it is preferable that the supply of fuel from the fuel container to the connector, the supply of fuel from the connector to the generator unit, or the power generation by the generator unit is stopped.

  In the present invention, it is further preferable that the fuel is hydrogen gas.

  In this invention, since the several generator unit is employ | adopted, the capacity | capacitance of one generator can be made small. Since a small-capacity generator can be employed, the amount of heat generated per generator can be kept small. Since the amount of heat generated per generator can be kept small, the life of the generator can be extended. Moreover, since the surface area for cooling a generator unit increases by using two or more generator units, the cooling efficiency of the whole generator can also be raised.

  When there is only one generator unit, the power supply stops when the generator unit breaks down. However, when there are a plurality of generator units as in the present invention, each generator unit In addition to being difficult to break, even if one generator unit breaks down, the other generator units can be operated, so that power supply can be continued. Further, since a plurality of generator units can be respectively replaced, even if it is necessary to stop power generation in one generator for repair or maintenance, other generator units can be operated. Therefore, the generator unit can be repaired or maintained without stopping the power supply.

It is a block diagram which shows an example of a structure of the generator system concerning this invention.

  Hereinafter, although embodiment of this invention is described using drawing, this invention is not limited to drawing and embodiment.

  In the present embodiment, the generator system includes a hydrogen gas cylinder 1, a connector 2, a generator unit 3, a power combiner 4, and a main control circuit 5.

  Hydrogen gas supplied to the connector 2 as fuel for the generator unit 3 is sealed in the hydrogen gas cylinder 1. The hydrogen gas cylinder 1 may have any shape and size, but when the hydrogen gas cylinder 1 is connected to the connector 2, the material and structure prevent the hydrogen gas explosion caused by static electricity from occurring. It is desirable that the hydrogen gas cylinder 1 is formed. Further, the hydrogen gas cylinders 1 can be connected to the connector 2 by the number of connecting portions of the hydrogen gas cylinders 1 in the connector 2.

  Since the hydrogen gas cylinders 1 can be replaced one by one, the hydrogen gas can be supplied to the connector 2 by the hydrogen gas cylinders 1b to 1d while the hydrogen gas cylinder 1a is being replaced. Therefore, since all the generator units 3 can be operated even during replacement of the hydrogen gas cylinder 1, electric power can be continuously supplied. In the present embodiment, an example using four hydrogen gas cylinders 1 is illustrated, but the number of hydrogen gas cylinders 1 may be any number.

  By the way, although caustic soda is sometimes used when cleaning a furnace for smelting metal or mineral, a large amount of hydrogen is generated when manufacturing caustic soda for cleaning locally. This large amount of hydrogen can be divided into gas cylinders and stored, and the hydrogen gas can be used as fuel for the generator unit 3 of the present invention. In this way, since the fuel for power generation can be obtained at a very low cost and in large quantities in the process of manufacturing the cleaning agent for the furnace, the operating cost of the entire factory can be greatly reduced.

  In this embodiment, by using hydrogen gas as the fuel, it is possible to generate power with high energy efficiency, prevent waste of fossil fuel, and contribute to solving global environmental problems such as air pollution and global warming. it can.

  In this embodiment, hydrogen gas is used as the fuel, but any gaseous fuel such as shale gas, city gas, LP gas, or oxygen gas may be used. Further, instead of gaseous fuel, for example, liquid fuel such as liquefied petroleum gas or liquefied natural gas may be used.

  The connector 2 is provided for supplying hydrogen gas from the hydrogen gas cylinder 1 to the generator unit 3. The connector 2 supplies an appropriate amount of hydrogen gas to the generator unit 3 at an appropriate timing. In order to supply an appropriate amount of hydrogen gas to the generator unit 3, for example, the voltage of the AC power output from each generator unit 3 can be separately monitored, and the supply amount of hydrogen gas can be controlled according to the situation. It is desirable that the control unit is built in. Moreover, in order to supply hydrogen gas to the generator unit 3 at an appropriate timing, the frequency of the AC power output from each generator unit 3 can be separately monitored, and the supply amount of hydrogen gas can be controlled according to the situation. It is desirable that the control unit is built in. In addition, in order to prevent the explosion of hydrogen gas caused by static electricity, for example, a hydrogen gas supply path is made of a metal material that does not accumulate static electricity, or the hydrogen gas supply path is protected by an electrostatic shield or the like. It is desirable to do.

  The method for adjusting the amount of hydrogen gas supplied from the hydrogen gas cylinder 1 to the connector 2 is provided with a gauge for detecting the pressure of hydrogen gas in the vicinity of the connection portion of the connector 2 with the hydrogen gas cylinder 1 and opens and closes at the connection portion. Although the method of adjusting a valve and the method of providing the system which electronically manages the supply pressure of the hydrogen gas with respect to the connector 2 can be considered, it is not limited to these.

  In the present embodiment, a plurality of generator units 3 are connected to one connector 2, and one connector 2 is connected to a plurality of hydrogen gas cylinders 1. Therefore, even when one hydrogen gas cylinder 1 is replaced, all the generator units 3 can be kept in operation, so that the power supply can be stably continued. Even if the hydrogen gas cylinder 1 is connected to the connector 2, the valve of the hydrogen gas cylinder 1 can be kept closed, so that the start timing of use of each hydrogen gas cylinder 1 can be shifted, and all the hydrogen gas cylinders 1 can be shifted. Can be prevented from becoming empty at the same time. Furthermore, compared with the case where the hydrogen gas cylinder 1 and the generator unit 3 are directly connected, the supply pressure of the hydrogen gas to the generator unit 3 can be further stabilized, so that the resistance to changes in power consumption is increased. There is. In addition, since the relationship between the remaining amount of hydrogen gas in the hydrogen gas cylinder 1 and the power generation in the generator unit 3 is not straightforward, the replacement timing of the hydrogen gas cylinder 1 and the maintenance timing of the generator unit 3 are completely separated and managed. There is also an advantage of being able to do it.

  In the present embodiment, the generator unit 3 includes an engine 31, a generator 32, a rectifier 33, a battery 34, or an inverter 35.

  Since a plurality of generator units 3 are provided in the generator system, even when the generator unit 3a is repaired, the generator units 3b and 3c can be operated to continuously supply power. . Further, when the generator unit 3a is being repaired, the commercial power supply may be used as an auxiliary power supply. In addition, in this embodiment, although the thing using three generator units 3 is illustrated, the number of generator units 3 may be any number.

  In the engine 31, the hydrogen gas supplied from the connector 2 is combusted and the piston moves. It is desirable to use an engine 31 that is driven at a low torque so that heat generation is suppressed to a small level. The engine 31 is preferably subjected to an explosion-proof process such as providing a ground wire or preventing sparks from being scattered.

  In the generator 32, the kinetic energy obtained by the piston in the engine 31 is converted into electric energy. The generator 32 in the present embodiment is an AC generator capable of obtaining a three-phase alternating current. However, the rectifier 33 and the inverter 35 may not be provided using a DC generator. However, it is desirable to use an AC generator from the viewpoint of energy efficiency. In addition, you may use the generator which outputs the alternating current of one phase instead of the generator which outputs a three-phase alternating current. In addition, it is desirable that the generator 32 be subjected to an explosion-proof treatment such as providing a ground wire or preventing sparks from being scattered.

  The rectifier 33 rectifies the AC power output from the generator 32 into DC power, and outputs the rectified DC power to the inverter 34 or the battery 35. As the rectifier 33, various rectifiers such as a mercury rectifier, a cuprous oxide rectifier, a thyratron, a selenium rectifier, a diode, or a bipolar vacuum tube can be used.

  The battery 34 stores the DC power output from the rectifier 33. The stored power is output to the inverter 35 as necessary, for example, when the power generation amount in the generator 32 is reduced. As the battery 34, various batteries such as a lead battery, a calcium battery, a hybrid battery, a shield battery, or a lithium ion battery can be used.

  The inverter 35 converts the DC power output from the rectifier 33 or the battery 34 into AC power. The inverter 35 is provided in each of the generator units 3, and each inverter 35 is connected to one power combiner 4.

  The power combiner 4 combines AC power output from the plurality of inverters 35 into one power. The combined power is output to a machine or device that requires power.

  In order to perform power combining, one of the plurality of inverters 35 is arbitrarily selected in advance as a master inverter 35a and the other as slave inverters 35b and 35c, and the phase of the AC power output from the slave inverters 35b and 35c is selected. Is easily controlled to match the phase of the AC power output from the master inverter 35a.

  In order to control the phases of the slave inverters 35b and 35c, prior to power synthesis, the phase difference between the phase of the AC power output from the master inverter 35a and the phase of the AC power output from the slave inverters 35b and 35c is eliminated. Is transmitted from the power combiner 4 to the plurality of slave inverters 35b and 35c, and it is convenient for the receiving units provided in the plurality of slave inverters 35b and 35c to receive the information. .

  Information for eliminating the phase difference between the phase of the AC power output from the master inverter 35a and the phase of the AC power output from the slave inverters 35b and 35c is the phase of the AC power output from the master inverter 35a itself. It may be information, or phase difference information between the phase of AC power output from the master inverter 35a and the phase of AC power output from the slave inverters 35b and 35c.

  In the former case, both slave inverters 35b and 35c receive the same information from the power combiner 4, but in the latter case, the phase of the AC power output from the master inverter 35a and the slave inverter Phase difference information with respect to the phase of the AC power output from 35b is transmitted to the slave inverter 35b, and the phase difference between the phase of the AC power output from the master inverter 35a and the phase of the AC power output from the slave inverter 35c. The information is transmitted to the slave inverter 35c, so that each slave inverter 35b and 35c receives different information from the power combiner 4 according to the phase of the AC power output from each slave inverter 35b and 35c. .

  By performing power combining in this way, AC power generated by each of the plurality of generator units 3 is combined without canceling each other, and loss of generated power can be suppressed.

  The main control circuit 5 mainly monitors and controls the connector 2 and the generator unit 3. Specifically, in the connector 2, the supply pressure of hydrogen gas from the hydrogen gas cylinder 1 to the connector 2, the internal pressure of the connector 2, the supply pressure of hydrogen gas from the connector 2 to the generator unit 3 are monitored. . In the generator unit 3, the temperature of the engine 31 connected to the generator 32 is monitored.

  When an abnormality in the hydrogen gas supply pressure from the hydrogen gas cylinder 1 to the connector 2 or the internal pressure in the connector 2 is detected, the supply of hydrogen gas from the hydrogen gas cylinder 1 to the connector 2 is controlled to stop. When an abnormality in the hydrogen gas supply pressure from the connector 2 to the generator unit 3 is detected, the supply of hydrogen gas from the connector 2 to the generator unit 3 is controlled to stop. In addition, when an abnormality in the temperature of the engine 31 connected to the generator 32 is detected, power generation in the generator unit 3 is stopped.

  In order to monitor and control the generator system, it is convenient to set items to be monitored and set a threshold value in order to define an abnormality for each monitoring item in the parts to be monitored and controlled. And when it exceeds or falls below the threshold, the safety of the generator system is ensured by stopping the function of each monitoring control part.

  The items to be monitored by the main control circuit 5 are not limited to those shown in the present embodiment. Other than the above, the intake or exhaust of the engine 31, the rotational speed of the engine 31, the generator 32 The phase difference elimination information output from the power generation amount, the rectifier 33, the battery 34, or the power combiner 4 may be a monitoring target. Moreover, as a control method, when abnormality is detected, it is good also as an aspect which not only controls stop of the function of each monitoring control site | part but can adjust the function in steps.

  In the present embodiment, a generator system including a plurality of generator units 3 is disclosed, but the generator system of the present invention is operated as a generator system including a plurality of such generator systems. Is also possible.

DESCRIPTION OF SYMBOLS 1 Hydrogen gas cylinder 2 Connector 3 Generator unit 31 Engine 32 Generator 33 Rectifier 34 Battery 35 Inverter 4 Power combiner 5 Main control circuit

Claims (5)

A plurality of generator units for generating electricity;
A power combiner for combining the power generated in the generator unit;
Each generator unit is connected to a power combiner,
The generator system, wherein the generator unit is replaceable with another generator unit. A connector for supplying fuel to the generator unit;
A plurality of fuel containers for supplying fuel to the connector;
The generator system according to claim 1, wherein the fuel container is replaceable with another fuel container. The generator unit includes a generator, a rectifier, and an inverter,
AC power output from the generator is rectified to DC power by a rectifier connected to the generator,
DC power output from the rectifier is converted to AC power by an inverter connected to the rectifier,
AC power output from a plurality of inverters is synthesized by a power combiner connected to the plurality of inverters,
A plurality of inverters are composed of a master inverter arbitrarily selected in advance and other slave inverters,
Information for eliminating the phase difference between the phase of AC power output from the master inverter and the phase of AC power output from the slave inverter is output from the power combiner to each of the slave inverters.
The generator according to claim 1 or 2, wherein the phase of the AC power output from the slave inverter is controlled to match the phase of the AC power output from the master inverter based on the information. system. A main control circuit for monitoring and controlling the connector and / or the generator unit;
In the connector, when the main control circuit detects an abnormality in the fuel supply pressure from the fuel container to the connector, the internal pressure of the connector, and / or the fuel supply pressure from the connector to the generator unit, and / or Or, in the generator unit, when the main control circuit detects an abnormality in the engine temperature connected to the generator,
The generator according to any one of claims 1 to 3, wherein the fuel supply from the fuel container to the connector, the fuel supply from the connector to the generator unit, or the power generation by the generator unit is stopped. system. The generator system according to any one of claims 1 to 4, wherein the fuel is hydrogen gas.

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