JP2009153259A - Method of controlling portable power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of controlling portable power generators, which optimizes the number of portable power generators operated in parallel to reduce fuel cost by automatically increasing and reducing the number of power generators operated in parallel, depending on the change in load amount. <P>SOLUTION: In the method of controlling the portable power generators each equipped with an automatic parallel operation controller, an order of starting a plurality of portable power generators 10, 20, 30 is set in advance, the portable power generators 20, 30 to be started in a second or subsequent order is started when the power rate transmitted to a load from the other portable power generator 10 which is started earlier than the portable power generator rises to a predetermined power rates A1, A2 or more, and are operated in parallel to the other portable power generator. The power generators 20, 30 are stopped when the power rate transmitted to a load from the other portable power generator which is started earlier than the portable power generator falls to a predetermined power rates B1, B2 or less. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for controlling a portable generator, and more particularly to a method for controlling a portable generator for efficiently supplying power to a load when a plurality of portable generators are connected in parallel.

  2. Description of the Related Art Portable generators that generate electricity by driving a generator with an engine are often used as power sources at construction sites. At construction sites that use large loads, use large portable generators that have the power generation capacity corresponding to the maximum load during the construction period from the viewpoint of large changes in power consumption and transportability of portable generators. Instead, a plurality of medium-sized or small portable generators are installed and operated in parallel as necessary.

When operating a plurality of portable generators in parallel, the voltage, frequency, and phase of the generator that is started after the second must match the bus voltage, frequency, and phase. Conventionally, an automatic parallel operation control device is incorporated in a control circuit for controlling operation, and when the voltage or the like is matched, a circuit breaker is turned on to start power transmission (for example, a patent) Reference 1). By incorporating such an automatic parallel operation control device in a portable generator, all generators can be turned on in a short time regardless of the number of generators, so there is no restriction on load capacity. A generator with a sufficient capacity can be selected, and the degree of freedom in the configuration of the power transmission equipment can be increased.
Japanese Utility Model Publication No. 63-49079

  When multiple portable generators are operated in parallel in this way, when using them as power sources for factories, shelters, event venues, etc. where load fluctuations are moderate, Power can be transmitted efficiently by installing and operating all units in parallel, but when using in places with large load fluctuations such as construction sites where large motors with large load capacity are repeatedly started and stopped Since it is not in time to start up the deficient generators after the load becomes large, the number of generators corresponding to the maximum load is operated in parallel. There were problems such as increased fuel costs.

  Especially in tunnel construction, portable generators cannot be installed in the tunnel under construction due to the exhaust gas, and several portable generators are installed in the building near the wellhead. With the progress, the distance between the face and the portable generator becomes longer, and it becomes difficult to start and stop the portable generator according to the load capacity. For this reason, all portable generators were started at the time of the start of construction, and the number of generators operated was more than necessary. Further, depending on the construction situation, there is a case where sufficient electric power can be supplied even if it is operated by a single machine. Therefore, it is desired that the generator can be started and stopped by remote control.

  Therefore, the present invention automatically reduces the fuel cost by optimizing the number of operating portable generators by automatically increasing / decreasing the number of parallel generators operated according to the change in load capacity. The purpose is to provide a control method of the machine.

  In order to achieve the above object, the first configuration of the portable generator control method according to the present invention is to connect a plurality of portable generators that drive the generator with an engine in parallel and transmit power to the same load. In addition, an automatic parallel operation control device that starts power transmission by turning on the circuit breaker after matching the voltage, frequency, and phase of the portable generator started after the second to the voltage, frequency, and phase of the bus In the control method of the portable generator, the startup order is set in advance for a plurality of portable generators, and the portable generator whose startup order is set to the second or later is started from the startup order of the portable generator. When the amount of power transmitted to the load from another portable generator with a higher order rises above the preset amount of power, it is started and operated in parallel with the other portable generator. Machine and portable generator The total amount of power activation order from the boot sequence is power to the load from the early other portable generator is characterized in that to stop when the drops below preset amount of power.

  The second configuration of the portable generator control method according to the present invention is the second or later when a plurality of portable generators that drive the generator with an engine are connected in parallel and transmitted to the same load. A portable generator equipped with an automatic parallel operation control device that starts power transmission by turning on a circuit breaker after matching the voltage, frequency and phase of the portable generator activated to the bus voltage, frequency and phase. In the control method, the start-up order is set in advance for a plurality of portable generators, and the start-up order is set to the second or later start-up order of the portable generators other than the start-up order of the portable generator. When the amount of electric power transmitted from the portable generator to the load rises above a preset amount of electric power, the portable generator is activated and operated in parallel with the other portable generators. The portable generator and the portable type Start from generator startup sequence It is related to the parallel automatic operation mode that stops when the total power transmitted to the load from other portable generators with a quick start falls below a preset amount of power, and the amount of power transmitted to the load Rather, it is characterized by having a parallel forced operation mode in which the portable generator is forcibly started up and operated in parallel with other portable generators.

  Furthermore, in the control method of the portable generator of the second configuration, the parallel forced operation mode is performed on the portable generator in standby before starting in the parallel automatic operation mode, and the parallel forced operation mode is changed to the parallel forced operation mode. When released, the parallel generator in the parallel automatic operation mode is continued without forcibly stopping the portable generator, and the selection and release of the parallel forced operation mode is performed by the portable generator. Is performed by operating a forced operation switch provided on a remote control panel wired or wirelessly connected to the remote control panel, and when the portable generator activated in the parallel forced operation mode starts parallel operation, the remote control panel is generating power. It is characterized by displaying.

  According to the control method of the portable generator of the present invention, the portable generator is automatically started or stopped according to fluctuations in the amount of electric power transmitted to the load. Power can be generated efficiently with the number of units, and the amount of fuel can be reduced by stopping more portable generators than necessary. In addition, by placing the required number of portable generators in parallel operation mode in parallel forced operation mode before using a large capacity load, it is possible to operate a large capacity load reliably. By switching to the parallel automatic operation mode when the power is released, the portable generator can be automatically stopped when the use of the load ends and the amount of power transmitted decreases.

  Furthermore, by selecting and canceling the parallel forced operation mode with the remote control panel, the portable generator can be forcibly started even from a location away from the portable generator, and during power generation with the remote control panel. Since it can be confirmed, a large-capacity load can be reliably operated even in tunnel construction.

  FIG. 1 is an explanatory view showing an operation example in a parallel automatic operation mode by three portable generators, FIG. 2 is an explanatory view showing a state in which a plurality of portable generators are connected in parallel, and FIG. 3 is a portable generator. FIG. 4 is an explanatory diagram showing an example of connection between the portable generator and the remote control panel, and FIG. 5 is another example of connection between the portable generator and the remote control panel. It is explanatory drawing which shows.

  First, as shown in FIG. 2, a plurality of portable generators 10, 20, and 30 connected in parallel and transmitting power to the same load include an engine Eng that drives the generator G, a generator G, and an output. Circuit breakers 11, 21, 31 provided between terminals 10a, 20a, 30a, and control circuits 12, 22, 32 provided with an automatic parallel operation control device and a communication circuit are provided, and each output terminal Power is supplied to the same load 42 via a bus 41 connected to 10a, 20a, 30a, and each signal via a signal line 43 connected to the communication terminals 10b, 20b, 30b of each control circuit 12, 22, 32. Bidirectional communication of data such as electric power in portable generators 10, 20, 30, whether there is an abnormality, and the state of the circuit breaker is performed.

  Each of the portable generators 10, 20, and 30 can be started and stopped by an operation switch or a stop switch provided on the control panel of the main body. As shown in FIG. 3, the main body of the portable generator 50 is used. A remote control panel 51 formed separately from the portable generator 50 is connected to the control signal input / output unit 53 of the control circuit 52 incorporated in the portable generator 50 by wire or wirelessly, so that it is far away from the portable generator 50. It is also possible to remotely operate and stop the portable generator 50 from a working site.

  The remote operation panel 51 includes an automatic operation switch 51 a corresponding to the parallel automatic operation circuit 52 a of the control circuit 52 and a parallel connection of the control circuit 52 as a start / stop switch for controlling the start and stop of the portable generator 50. A forced operation switch 51b corresponding to the forced operation circuit 52b is provided, and an auxiliary contact 52c that is turned on at the same time as the breaker of the portable generator 50 is turned on and power transmission from the bus 54 to the load 55 is started. A power generation indicator lamp 51c that is turned on when is turned on, and an emergency stop switch 51d corresponding to the emergency stop circuit 52d of the control circuit 52 are provided.

  The remote operation panel 51 and the control signal input / output unit 53 may be wired by a communication cable 56 for transmitting and receiving control signals, and the battery 57 of the portable generator 50 may be used as a power source for the remote operation panel 51. it can. In addition, a wireless communication device (not shown) provided with a power supply unit may be connected to the remote control panel 51 and the control signal input / output unit 53 to make a wireless connection.

  Next, as shown in FIG. 4, an example of operation control in a state where the remote operation panel 51 is wired to the three all portable generators 10, 20, and 30 via the communication cables 56 will be described. First, the activation order is set for each of the three portable generators 10, 20, and 30 from each control panel. For example, the first portable generator 10 is designated as the preceding machine to be activated first, and the second portable generator 20 is second, the third portable generator as the follower to be activated after the second unit. 30 is set to start third. In addition, each of the portable generators 10, 20, and 30 has an operation key switch on the control panel turned ON.

  Then, while the forced operation switch 51b of each remote operation panel 51 is in the “OFF” state, the automatic operation switch 51a is operated to switch it to “ON”, whereby the operation mode of each portable generator 10, 20, 30 is set. Is set to parallel automatic operation mode. In this parallel automatic operation mode, based on the capability of each portable generator 10, 20, 30, the amount of power for starting or stopping the portable generator whose activation order is set to the second or subsequent follower is preset. Has been.

  That is, as shown in FIG. 1, before the operation when the load power is “0”, when the operation key switch of each of the portable generators 10, 20, and 30 is turned ON, the first designated as the preceding machine. Only the engine of the portable generator 10 is started to drive the generator, and after the generator voltage is established, the circuit breaker 11 is turned on and power transmission from the bus 41 to the load 42 is started. At the same time, since the auxiliary contact 52c is turned on as the circuit breaker 11 is turned on, the power generation indicator lamp 51c of the remote control panel 51 connected to the first portable generator 10 is turned on. At this time, the second portable generator 20 and the third portable generator 30 are in a standby state in which the engine is stopped, and the power generation indicator lamp 51c of the remote control panel 51 connected thereto is turned off. Yes.

  As the work progresses, the amount of load used increases, and when the amount of power transmitted to the load rises above the preset first power consumption A1 on the low power side, it is automatically set to the second. When the engine of the second portable generator 20 is started and the generator starts generating power, the voltage, frequency and phase are matched with the voltage, frequency and phase of the bus by the aforementioned automatic parallel operation control device. The circuit breaker 21 of the portable generator 20 is turned on, and the second portable generator 20 enters a state of performing a parallel operation with the first portable generator 10. At the same time, the power generation indicator lamp 51c of the remote control panel 51 connected to the second portable generator 20 is turned on.

  Furthermore, when the total amount of power transmitted to the load in the parallel operation of the two portable generators 10 and 20 rises above the preset second starting power amount A2 on the high power side, the third power is automatically generated. When the engine of the third portable generator 30 that is set to start is started and the generator starts generating power, and the voltage, frequency, and phase match the bus by the automatic parallel operation control device, the third portable generator The circuit breaker 31 of the machine 30 is turned on, and the third portable generator 30 enters a state in which three units of the first portable generator 10 and the second portable generator 20 perform parallel operation. At the same time, the power generation indicator lamp 51c of the remote control panel 51 connected to the third portable generator 30 is turned on. Moreover, during parallel operation, by exchanging information of the portable generators 10, 20, and 30 via the signal line 43, the power transmission amounts G1, G2, and the like from the portable generators 10, 20, and 30 are exchanged. Efficient operation is performed by averaging G3.

  When the parallel operation by three portable generators 10, 20, and 30 is being performed, the total amount of power transmitted to the load falls below the preset high power side first stop power amount B1. The circuit breaker 31 of the third portable generator 30 with the slowest starting order is opened, the power transmission to the bus 41 is terminated, the corresponding indicator lamp 51c during power generation is turned off, and the engine performs a predetermined cooling operation. It stops later and the 3rd portable generator 30 will be in a standby state.

  Furthermore, when performing the parallel operation by the two portable generators 10 and 20, when the total amount of power transmitted to the load falls below the preset second stop power amount B2 on the low power side. Next, the circuit breaker 21 of the second portable generator 20 whose start order is slow next opens, the power transmission to the bus 41 is terminated, the corresponding power generation indicator lamp 51c is turned off, and the engine performs a predetermined cooling operation. After that, the second portable generator 20 enters a standby state.

  As described above, the start power amounts A1 and A2 and the stop power amounts B1 and B2 are set to appropriate values according to the capacities and load conditions of the respective portable generators 10, 20, and 30, and each portable type. By setting the operation mode of the generators 10, 20, and 30 to the parallel automatic operation mode, the portable generators 20 and 30 whose activation order is the second or later are automatically set according to the increase or decrease in the amount of power transmitted to the load. Therefore, it is possible to transmit power by operating a necessary and sufficient number of portable generators according to the state of the load being used. Thereby, the engine of an unnecessary portable generator can be stopped, fuel consumption can be reduced and fuel cost can be reduced.

  On the other hand, when supplying power from only one of the first portable generators 10, when using a new load that requires large power from the work procedure, before using the load The operation mode of the second portable generator 20 is set to the parallel forced operation mode by switching the forced operation switch 51b of the remote control panel 51 connected to the second portable generator 20 to be activated second. Thus, even when the amount of power transmitted from the first portable generator 10 to the load is small, the second portable generator 20 is forcibly activated to perform parallel operation with the first portable generator 10. Can be done.

  In the second portable generator 20 that has received the forced start signal from the remote control panel 51 and started the engine, the automatic parallel operation device operates in the same manner as described above, and the voltage, frequency and phase of the bus 41 and the voltage of the own machine. When the frequency and phase match, the circuit breaker 21 is turned on to enter a parallel operation state with the first portable generator 10, and the auxiliary contact 52c of the portable generator 20 is turned on. The power generation indicator lamp 51c of the remote control panel 51 connected to the second portable generator 20 is turned on.

  In this way, after confirming that both of the power generation indicator lamps 51c of the two operation panels 51 are lit, the use of the new load is started, so that the new load can be started and operated smoothly and reliably. It can be carried out. Also, when the forced operation switch 51b of the third third portable generator 30 is switched to “ON” and forcibly activated, a new load is applied after confirming that the three power generation indicator lamps 51c are turned on. By starting up, it is possible to reliably prevent a failure due to power shortage.

  Further, during operation of the second and third portable generators 20 and 30 that have been forcibly activated, the operation mode is switched by switching the forced operation switch 51b to “OFF” while the automatic operation switch 51a remains “ON”. Is switched from the parallel forced operation mode to the above-described parallel automatic operation mode, and when the amount of electric power is reduced, the third and second portable generators 30 and 20 are automatically stopped in order and put into a standby state.

  Moreover, all the portable generators 10, 20, and 30 can be stopped by switching both the automatic operation switch 51a and the forced operation switch 51b to “OFF”. Furthermore, when the portable generator has to be urgently stopped for some reason, the portable generator can be quickly stopped by operating the emergency stop switch 51d of the operation panel 51. In any case, it is possible to know the operating state of each of the portable generators 10, 20, and 30 by confirming whether the power generation indicator lamp 15c is turned on or off. It can proceed smoothly.

  Therefore, even when the work site and the installation location of the portable generators 10, 20, and 30 are separated from each other, by operating the remote control panel 51 and setting the operation mode to the parallel automatic operation mode, the load can be reduced. It is possible to automatically start or stop the number of portable generators according to the usage situation, and optionally select the number of portable generators to operate by selecting the parallel forced operation mode as necessary. As a result, it is not necessary to continuously operate more portable generators than necessary during the working hours, and it is possible to reduce the amount of fuel consumed. For maintenance and inspection of the portable generator 11. Costs required and consumables can be reduced.

  For example, 4 portable power generators with 13.6 liters per hour of fuel consumption with no rated load installed, and the time of high load operation that requires all 4 units to operate during 8 hours a day If the time of low load operation that can be covered by 4 hours for 1 hour is 4 hours, and if all portable generators are operated during work hours as in the past, 13.6 x 8 x 4 The total daily fuel consumption is 435.2 liters. However, when three portable generators are stopped during low load operation, (13.6 × 8 × 1) + (13.6 × 4 × 3), the total daily fuel consumption is 272.0 liters, which means that 163.2 liters of fuel can be saved per day. If the fuel is 100 yen per liter, it will save 16320 yen per day, and if the construction period is long, such as tunnel construction or dam construction, the monthly working days will be 20 days and about 4 million yen per year It becomes an account that can be saved.

  In addition, as shown in FIG. 5, operation control of a plurality of portable generators 10, 20, 30 can be performed by a single remote operation panel 61. In this case, the remote control panel 61 is provided with automatic operation switches 62a to 62c, forced operation switches 63a to 63c and power generation indicator lamps 64a to 64c corresponding to the portable generators 10, 20, and 30, respectively. The switch for emergency stop of the portable generator need only be provided with one emergency stop switch 65 for stopping all portable generators connected to the remote control panel 61. A relay box 66 for joining and distributing signals transmitted and received by the control signal input / output unit 13 is provided near the portable generators 10, 20, and 30. Can be wirelessly connected.

It is explanatory drawing which shows the example of an operation | movement in the parallel automatic operation mode by three portable generators. It is explanatory drawing which shows the state which connected the several portable generator in parallel. It is a circuit diagram which shows the state which connected the remote control panel to the portable generator. It is explanatory drawing which shows the example of a connection of a portable generator and a remote control panel. It is explanatory drawing which shows the other example of a connection of a portable generator and a remote control panel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10, 20, 30, 50 ... Portable generator, 10a, 20a, 30a ... Output terminal, 10b, 20b, 30b ... Communication terminal, 11, 21, 31 ... Circuit breaker, 12, 22, 32 ... Control circuit, 41 ... Bus, 42 ... Load, 43 ... Signal line, 51, 61 ... Remote control panel, 51a, 62a to 62c ... Automatic operation switch, 51b, 63a to 63c ... Forced operation switch, 51c, 64a to 64c ... Indicator during power generation 51d, 65 ... emergency stop switch, 52 ... control circuit, 52a ... parallel automatic operation circuit, 52b ... parallel forced operation circuit, 52c ... auxiliary contact, 52d ... emergency stop circuit, 53 ... control signal input / output unit, 54 ... bus , 55 ... load, 56 ... communication cable, 57 ... battery, 66 ... relay box, Eng ... engine, G ... generator

Claims (4)

  When connecting multiple portable generators that drive the generator with the engine in parallel and transmitting power to the same load, the voltage, frequency, and phase of the portable generator that is activated second or later are set to the bus voltage, In the control method of the portable generator equipped with the automatic parallel operation control device that starts the power transmission by turning on the circuit breaker after matching the frequency and phase, the starting order is set in advance for a plurality of portable generators, The portable generator whose start order is set to the second or later is the power whose power is transmitted to the load from another portable generator whose start order is earlier than the start order of the portable generator. When it rises above the amount, it starts to run in parallel with other portable generators, and the load from the portable generator and other portable generators whose starting order is earlier than the starting order of the portable generators to the load Total power transmitted Control method for a portable generator, characterized in that to stop when the drops below preset amount of power.   When connecting multiple portable generators that drive the generator with the engine in parallel and transmitting power to the same load, the voltage, frequency, and phase of the portable generator that is activated second or later are set to the bus voltage, In the control method of the portable generator equipped with the automatic parallel operation control device that starts the power transmission by turning on the circuit breaker after matching the frequency and phase, the starting order is set in advance for a plurality of portable generators, The portable generator whose start order is set to the second or later is the power whose power is transmitted to the load from another portable generator whose start order is earlier than the start order of the portable generator. When it rises above the amount, it starts to run in parallel with other portable generators, and the load from the portable generator and other portable generators whose starting order is earlier than the starting order of the portable generators to the load Total power transmitted Parallel automatic operation mode to be stopped when the power is reduced below a preset amount of power, and other portable generators by forcibly starting the portable generator regardless of the amount of power transmitted to the load And a parallel forced operation mode for parallel operation with the portable generator.   The parallel forced operation mode is performed for a portable generator that is in standby before starting in the parallel automatic operation mode, and when the parallel forced operation mode is canceled, the portable generator is forcibly stopped. 3. The portable generator control method according to claim 2, wherein the parallel operation in the parallel automatic operation mode is continued.   The selection and release of the parallel forced operation mode is performed by operating a forced operation switch provided on a remote operation panel wired or wirelessly connected to the portable generator, and the portable generator activated in the parallel forced operation mode 4. The portable generator control method according to claim 3, wherein a display during power generation is displayed on the remote operation panel when parallel operation is started.

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