JP2013223401A - Power generation and supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation and supply system capable of detecting disconnection in a current transformer without controlling a power generator, and suppressing the disconnection in the current transformer while improving work efficiency and accuracy.SOLUTION: A power generation and supply system comprises: a power generator 1; a power supply line 2; a remote controller 3 for transmitting a control signal to the power generator 1; a control line 4 for connecting the power generator 1 and remote controller 3; current transformers 51 and 52 installed on the power supply line 2; a measurement communication unit 63 which is connected to the current transformers 51 and 52 and receives current information from the current transformers 51 and 52; a disconnection detection unit 64 for detecting disconnection in the current transformers 51 and 52; and a detection device 6 arranged along the power supply line 2 on which the current transformers 51 and 52 are installed. The detection device 6 is connected to the control line 4 and transmits the information based on the current information and information on existence of the disconnection in the current transformers 51 and 52 to the power generator 1 through the control line 4.

Description

  The present invention relates to a power generation system including a power generation device driven by fuel and a current transformer that detects a current value of a commercial power source.

  In recent years, an engine is driven by fuel such as gas or gasoline, and a generator is driven by the driving force of the engine, and a current transformer (CT: Current Transformer) that detects a current value supplied from a commercial power source to a load. Are provided in general household houses, stores of various contractors, and the like. The power generation system acquires current information supplied from a commercial power source using a current transformer, and adjusts the power generation amount according to the load and the commercial power. Examples of the power generation system include a cogeneration device driven by an engine, a power generation heat pump type air conditioner, or a power generation device using a fuel cell. The power generation device portion that uses fuel and constitutes the above system is installed outdoors by exhaust gas generation or the like.

  For example, as described in Japanese Patent Application Laid-Open No. 2002-238166 (Patent Document 1), the current transformer is provided on a power supply line of a commercial power source and extends to a power generator (wiring portion of the current transformer). To transmit the current signal to the power generator. The signal line is directly connected to the power generator to enable detection of the disconnection of the current transformer. The current transformer is installed indoors to measure commercial power.

  Moreover, in order to detect the disconnection of a current transformer, as described in Japanese Patent Application Laid-Open No. 2005-45859 (Patent Document 2), commercial power and generated power, such as a test run of a load connected to the generated power supply system, are performed. In some cases, the current is detected by controlling so that the current is not in an equilibrium state, and the presence or absence of disconnection of the current transformer is detected.

JP 2002-238166 A JP 2005-45859 A

  However, in the configuration as described above, the current transformer installed indoors and the power generator installed outdoors have a large separation distance, and the signal line connecting the current transformer and the power generator is long. As shown in FIG. 5, the current transformer CT requires two signal lines for one electric wire due to its configuration, and at least two electric wires (R phase) in a single-phase three-wire power supply line. , S phase), four signal lines are required. Thus, since the signal lines are long and have a large number, the possibility of disconnection has increased.

  In construction, it is necessary to connect the four signal lines extended to the outdoor power generator without making a mistake between positive and negative, and it takes time and effort, and it is difficult to find a connection error. There was a problem in terms. Moreover, it was not preferable from the viewpoint of energy saving to operate the power generation device for detecting disconnection and control the amount of power generation as in Patent Document 2.

  The present invention has been made in view of such circumstances, and can detect disconnection of the current transformer without controlling the power generation device, suppress disconnection of the current transformer, and improve work efficiency and accuracy of construction. An object is to provide a power generation system that can be improved.

  The invention according to claim 1 is a power generation device that generates power using fuel, a power supply line that supplies at least one of commercial power and generated power generated by the power generation device to a load, and a control signal to the power generation device. A remote control device for transmitting, a control line for connecting the power generation device and the remote control device, a current transformer provided for the power supply line for detecting the current value of the commercial power, and the current transformer. A measurement communication unit that is connected to a current transformer and receives current information from the current transformer, and a disconnection detection unit that detects a disconnection of the current transformer by a disconnection detection member provided for the current transformer. And a detection device disposed along the power supply line provided with the current transformer, and the detection device is connected to the control line and is connected to the power generation device via the control line, The current It transmits information about the presence or absence of disconnection of the information and the current transformer-based distribution. “Information based on current information” may be information based on a current value, and is a concept including current information itself, voltage information, and power information.

  According to a second aspect of the present invention, in the first aspect, the disconnection detection unit detects a disconnection of the current transformer by applying a voltage to the disconnection detection member.

  According to the first aspect of the present invention, since the current transformer is connected to the detection device installed along the power supply line, the length of the signal line of the current transformer can be shortened. Thereby, the possibility of disconnection of the signal line is reduced. Moreover, since the detection apparatus is arrange | positioned along a power supply line, it can construct in the state which can observe the wiring of each phase of a power supply line, and can suppress a connection mistake. In addition, since the power supply line can be visually checked, the construction is simplified and connection errors can be easily checked. Moreover, since the disconnection detection part performs a disconnection detection of a current transformer directly using a disconnection detection member, the presence or absence of the electric power generation of a power generator does not influence. Thus, according to the present embodiment, it is possible to detect disconnection of the current transformer without controlling the power generation device, to suppress disconnection of the current transformer, and to improve the work efficiency and accuracy of construction.

  According to the second aspect of the present invention, by applying a voltage to the disconnection detection member, the detection waveform of the current transformer changes, and the presence or absence of the disconnection of the current transformer can be detected. That is, according to the present invention, the disconnection of the current transformer can be detected with a simpler configuration without special control by the power generator.

It is a conceptual diagram which shows the structure of the electric power generation system of this embodiment. It is a conceptual diagram which shows the structure of the detection apparatus of this embodiment. It is a conceptual diagram for demonstrating the current transformer and disconnection detection part of this embodiment. It is a conceptual diagram which shows the structure of the power generation power supply system of the deformation | transformation aspect of this embodiment. It is a conceptual diagram which shows the structure of the conventional electric power generation system.

  Next, the present invention will be described in more detail with reference to embodiments. This embodiment demonstrates the case where the cogeneration apparatus which drives a generator with an engine is applied as a power generation system. The power generation system may be any system that generates power using fuel, and in addition to an engine-driven cogeneration system, a power generation heat pump type air conditioner (eg, power generation GHP) including a generator, or a system including a fuel cell (For example, a fuel cell cogeneration apparatus) may be used.

  The power generation system of the present embodiment is a cogeneration apparatus, and as shown in FIG. 1, the power generation apparatus 1, the thermal circuit 15, the power supply line 2, the remote control device 3, the control line 4, Current transformers 51 and 52 and a detection device 6 are provided.

  The power generation apparatus 1 mainly includes an engine 11, a generator 12, a control unit 13, and an inverter 14. The engine 11 is a gas engine that uses gas as fuel. Examples of the gas include natural gas and propane gas. The engine 11 is connected to a generator 12 and is started by a starter (not shown) and supplies driving force to the generator 12. The generator 12 generates power with the driving force of the engine 11 and supplies the generated power to the inverter 14. The control unit 13 is an electronic control unit (ECU) including a microcomputer, and controls the amount of power generation. The control unit 13 controls driving of the engine 11 according to commercial power and load conditions (control by the remote control device 3 and power consumption). The inverter 14 is connected to the power supply line 2, converts the AC waveform of the generated power into an AC waveform of the commercial power supply, and supplies the generated power to the power supply line 2.

  The thermal circuit 15 is a circuit that supplies hot water or water vapor using heat of the engine 11 (for example, heat of cooling water or heat of exhaust gas), and supplies hot water to, for example, an indoor water heater 15a. The power generator 1 is disposed outdoors due to sound, exhaust gas generation, and the like.

  The power supply line 2 is a single-phase three-wire electric wiring connected to the commercial power source Z, the power generation device 1, the water heater 15 a, the remote control device 3, the detection device 6, and the electric device Y. The power supply line 2 supplies at least one of the commercial power supplied from the commercial power supply Z and the generated power supplied from the power generator 1 to a load including the water heater 15a and the electric device Y. The power supply line 2 includes R-phase, N-phase, and S-phase electrical wirings 21, 22, and 23. In general, in the commercial power supply Z, the R phase and the S phase are 100 V with respect to the N phase.

  The remote control device 3 is a remote controller (remote controller) installed indoors, and is connected to the control line 4. The remote control device 3 transmits a control signal to the control line 4 in accordance with a user operation. The remote control device 3 transmits a control signal to the power generation device 1 and the water heater 15a via the control line 4. For example, when the user presses a hot water supply ON button of the remote control device 3, the remote control device 3 transmits an ON control signal to the water heater 15 a and the power generation device 1. The hot water heater 15a is activated by the ON control signal, and the power generator 1 (the control unit 13) recognizes that the water heater 15a is in the activated state. The remote control device 3 is supplied with power from the power supply line 2 or the water heater 15a.

  The control line 4 is an electric wiring composed of two wires, and connects the power generation device 1 and the remote control device 3. The control line 4 is disposed in a mold tube (not shown). On the control line 4, a water heater 15a and a detection device 6 are arranged. That is, the control line 4 connects the water heater 15 a and the remote control device 3, and further connects the water heater 15 a and the power generation device 1 via the detection device 6. The control line 4 transmits the control signal of the remote control device 3 to the water heater 15a and the power generation device 1, and also the signal from the power generation device 1 (for example, information for displaying the power generation amount and warning on the remote control device 3). Is transmitted to the remote control device 3.

  The current transformers 51 and 52 are devices for detecting the supply current from the commercial power supply Z, and are provided in the indoor power supply line 2. The current transformers 51 and 52 detect current using an induced electromotive force. The current transformers 51 and 52 are disposed in the housing 61 of the detection device 6. As shown in FIG. 3, the current transformer 51 has a known transformer structure, and includes an annular iron core 511, a coil 512, and two signal lines 513. The annular iron core 511 is provided so that the R-phase electrical wiring 21 of the power supply line 2 passes inside. The coil 512 is wound around the annular iron core 511. The signal line 513 extends from both ends of the coil 512 to a measurement communication unit 63 described later. The current transformer 51 transforms the current flowing through the electric wiring 21 at a predetermined current transformation ratio and transmits the current to the measurement communication unit 63.

  Similarly, the annular core 521 of the current transformer 52 is provided so that the S-phase electrical wiring 23 of the power supply line 2 passes inside. The signal line 523 extends from both ends of the coil 522 to a measurement communication unit 63 described later. The current transformer 52 transforms the current flowing through the electrical wiring 23 at a predetermined current transformation ratio and transmits the current to the measurement communication unit 63.

  The detection device 6 is disposed along a location (electrical wirings 21 to 23) where the current transformers 51 and 52 are provided in the power supply line 2. The detection device 6 is connected to the power supply line 2 and is supplied with power from the power supply line 2. As shown in FIG. 2, the detection device 6 includes a housing 61, a voltage detection unit 62, a measurement communication unit 63, and a disconnection detection unit 64. The housing 61 is a substantially hollow rectangular parallelepiped member that houses the current transformers 51 and 52, the voltage detection unit 62, the measurement communication unit 63, and the disconnection detection unit 64. The casing 61 is provided with a lid member and can be opened. The casing 61 is provided with a through hole 611, and a part of the three-phase electrical wirings 21 to 23 is disposed inside through the through hole 611. The current transformers 51 and 52 are provided in the corresponding electrical wirings 21 and 23 in the housing 61.

  The voltage detection unit 62 is a voltage sensor that detects the voltage of each phase, and is provided in the electrical wirings 21 to 23. The voltage detection unit 62 transmits the detected voltage information to the measurement communication unit 63.

  The measurement communication unit 63 is an electronic control unit that receives the current information from the current transformers 51 and 52 and the voltage information from the voltage detection unit 62, and from the commercial power supply Z based on the received current information and voltage information. The supplied power value is calculated. The measurement communication unit 63 is disposed on the control line 4 and is connected to the power generation device 1 and the remote control device 3 via the control line 4. The measurement communication unit 63 transmits power information that is a power value supplied from the commercial power supply Z to the power generation device 1 via the control line 4. In addition, the measurement communication unit 63 transmits the control signal of the remote control device 3 on the control line 4 to the power generation device 1 as it is, and transmits the signal of the power generation device 1 on the control line 4 to the remote control device 3 as it is.

  The disconnection detection unit 64 detects the presence or absence of disconnection by applying a voltage to the detection waveforms of the current transformers 51 and 52. Specifically, the disconnection detection unit 64 is provided in each of the current transformers 51 and 52, and includes a coil (corresponding to “disconnection detection member”) 641, a pulse application unit 642, and a disconnection determination unit 643. ing. Here, since the disconnection detection unit 64 is provided in the same configuration with respect to each of the current transformers 51 and 52, one (disconnection detection unit 64 for the current transformer 51) will be described and the description of the other will be omitted. . The coil 641 is wound around one of the signal lines 513 of the current transformer 51 so as to use the principle of the transformer. The coil 641 is provided directly with respect to the current transformer 51. Both ends of the coil 641 are connected to the measurement communication unit 63 (pulse application unit 642).

  The pulse application unit 642 is disposed in the measurement communication unit 63. The pulse application unit 642 applies a pulse voltage to the coil 641. The disconnection determination unit 643 is arranged in the measurement communication unit 63 and detects a voltage change of the coil 641 due to the pulse voltage application of the pulse application unit 642. When the current transformer 51 (signal line 513) is not disconnected, the coil 641 is affected by the current detected by the current transformer 51 by electromagnetic induction. That is, the disconnection determination unit 643 determines the presence or absence of a disconnection based on whether or not the detection waveform of the coil 641 is applied to the pulse waveform. The disconnection determination unit 643 determines that there is no disconnection if the detection waveform of the current transformer 51 is applied, and determines that there is disconnection if it is not applied. The disconnection determination unit 643 transmits the determination result to the power generation device 1 via the control line 4. Note that the housing 61 is provided with an LED (not shown) that is lit to notify the user when the wire is disconnected. A breaker X is installed in the indoor power supply line 2.

(Function)
In the present embodiment, the current transformers 51 and 52 detect the current of commercial power flowing through the power supply line 2 and transmit it to the measurement communication device 63 disposed in the same casing 61. The measurement communication device 63 calculates commercial power (power purchased from an electric power company) based on the current information and the voltage information transmitted from the voltage detection unit 62 and transmits it to the control unit 13 of the power generation device 1. At this time, the measurement communication device 6 transmits power information to the power generation device 1 using the control line 4 that is a communication wiring between the remote control device 3 and the power generation device 1. In the present embodiment, the control line 4 is used as a communication means for current information (power information) from indoors to outdoors that is a long distance.

  In the present embodiment, the pulse application unit 642 applies a pulse voltage to the coil 641 wound around the current transformers 51 and 52, for example, every predetermined time, and the disconnection determination unit 643 detects a waveform after the pulse voltage is applied. To determine the presence or absence of disconnection. The disconnection determination unit 643 is disposed in the measurement communication device 63 (ECU), and transmits the disconnection information to the power generation device 1 using the control line 4 as in the case of power information. The disconnection information may be transmitted so that some signal is transmitted only when the disconnection occurs. The disconnection determination unit 643 may also transmit disconnection information to the remote control unit 3.

  Further, in the present embodiment, when the control line 4 is disconnected, the communication with the remote control device 3 is disconnected, so there is no response during communication, and the control unit 13 of the power generator 1 recognizes the disconnection of the control line 4. can do. As described above, the power generation system of the present embodiment can acquire power information of commercial power and can detect disconnection of the current transformers 51 and 52 and disconnection of the control line 4.

(effect)
According to this embodiment, since the signal lines 513 and 523 of the current transformers 51 and 52 are connected to the measurement communication unit 63 of the detection device 6 installed along the power supply line 2, four signal lines are provided. The lengths of 513 and 523 can be shortened. Thereby, the possibility of disconnection of the signal lines 513 and 523 is reduced. Moreover, since the measurement communication part 63 is arrange | positioned close to the power supply line 2, it can construct in the state which can see the electric wirings 21-23 of the power supply line 2, and the phase and plus of corresponding signal lines 513 and 523 Negative connection mistakes can be suppressed. Moreover, since the power supply line 2 can be visually observed, the construction is simplified and a connection error can be easily checked. Thus, according to this embodiment, the disconnection of the current transformers 51 and 52 can be suppressed, and the work efficiency and accuracy of construction can be improved.

  Moreover, according to this embodiment, the disconnection detection of the current transformers 51 and 52 is the same as that of the current transformers 51 and 52, the coil 641 and the pulse application part 642 (measurement communication part 63) arrange | positioned in the same housing | casing 61. Therefore, the impedance and noise are small, and the voltage required for detection (here, the pulse voltage) can be small.

  Moreover, since the disconnection detection part 64 can judge a disconnection only by applying a pulse voltage for every predetermined time, it does not require special complicated control for a disconnection detection. For example, the method of detecting disconnection by performing a trial run or the like as in Patent Document 2 is not preferable from the viewpoint of energy saving, but in the present embodiment, disconnection of the current transformers 51 and 52 without special control. Can be detected. According to the present embodiment, it is possible to eliminate the waste of power generation energy that drives a power generation device for detecting disconnection. In addition, an increase in manufacturing cost can be suppressed by eliminating complicated control and using a simple configuration.

  Moreover, according to this embodiment, the control line 4 is utilized for transmission of power information and disconnection information. The control line 4 doubles as a communication line for control signals and the like and a communication line for power information and the like. The control line 4 connects the remote control device 3 and the power generation device 1 via, for example, an interface unit (not shown). By using the control line 4 that is originally necessary, it is not necessary to add a new wiring, and an increase in manufacturing cost can be suppressed. Further, the interface unit can be omitted because the detection device 6 performs the interface function. Moreover, since the control line 4 is an important wiring that is connected to the indoor remote control device 3 and communicates control signals, the outer periphery is covered with a mold tube. Therefore, disconnection of communication lines such as power information can be suppressed without increasing costs.

(Modification)
The present invention is not limited to the above embodiment. For example, the detection device 6 may be provided along the power supply line 2 where the current transformers 51 and 52 are provided, and may be installed at a position close to the indoor current transformers 51 and 52. The term “along the power supply line 2” means that the position includes the position close to the power supply line 2 (indoor) to the power supply line 2. By disposing on the power supply line 2 as in the present embodiment, the distance between the power supply line 2 and the measurement communication unit 63 is reduced, which is more effective.

  Further, the casing 61 of the detection device 6 may include a terminal and wiring (not shown) instead of the through hole 611. There are three terminals on one side outside the housing 61 and three terminals on the other side, and there are three wires, which connect the terminals on the one side and the other side. Each terminal is connected to electrical wirings 21 to 23 for each phase, and three wirings function as electrical wirings 21 to 23. And the current transformers 51 and 52 should just be set with respect to three wiring in the housing | casing 61 similarly to the above. This also exhibits the same effect as the embodiment.

  Further, the measurement communication unit 63 may be a unit that does not calculate electric power but only relays current information from the current transformers 51 and 52. In this case, as shown in FIG. 4, the voltage detection unit 62 is disposed outside the housing 61 and connected to the power generation device 1 via the breaker X1, and the control unit 13 of the power generation device 1 displays the current information and voltage information. Based on this, commercial power is calculated.

  Further, the disconnection detection method is not limited to the above. For example, the voltage applied by the pulse application unit 642 may not be a pulse voltage. As a disconnection detection method, a constant voltage is always applied to the current transformers 51 and 52, and current information (detected current waveform) is raised in the absence of disconnection, while current information (detected) is detected in disconnection. Current waveform) is not raised, and a method of determining the presence or absence of disconnection based on the presence or absence of the elevation may be used. Even in this case, since the separation distance between the current transformers 51 and 52 and the measurement communication unit 63 is small, the disconnection can be detected even if the applied voltage is reduced.

  Further, the power generation device 1 is a so-called outdoor unit, and in the case of a cogeneration device or a power generation heat pump type air conditioner, is a portion including at least an engine, a power generator, a control unit (control unit), and an inverter. The power generation device of the power generation heat pump type air conditioner further includes a compressor. In the case of a fuel cell system such as a fuel cell cogeneration device, the power generation device is a portion on which a fuel cell is mounted and is supplied with fuel such as gas. In addition, the remote control device is not limited to the water heater 15a, and may be a device that controls other electrical equipment (load) such as an air conditioner.

  In addition, the measurement communication unit 63 and the disconnection detection unit 64 may be configured to be supplied with power from an external power source such as a battery instead of the power supply line 2. Also with this configuration, disconnection of the current transformer can be detected regardless of the amount of power supplied from the power generation device 1 to the power supply line 2. Further, the electrical wires 21 and 23 may be wound around the annular cores 511 and 521. Further, the fuel of the engine 11 is not limited to gas, but may be liquid fuel such as gasoline, kerosene, or light oil.

1: power generation device, 11: engine, 12: generator, 13: control unit,
14: inverter, 15: thermal circuit,
2: power supply line, 3: remote control device, 4: control line,
51, 52: Current transformer, 6: Detection device, 61: Housing, 62: Voltage detection unit,
63: Measurement communication unit, 64: Disconnection detection unit, 641: Coil (disconnection detection member)

Claims (2)

A power generation device that generates power using fuel;
A power supply line for supplying at least one of commercial power and generated power generated by the power generator to a load;
A remote control device for transmitting a control signal to the power generation device;
A control line connecting the power generation device and the remote control device;
A current transformer provided for the power supply line for detecting a current value of the commercial power;
A measurement communication unit that is connected to the current transformer and receives current information from the current transformer; and a disconnection detection unit that detects a disconnection of the current transformer by a disconnection detection member provided for the current transformer. And a detection device disposed along the power supply line provided with the current transformer,
With
The said detection apparatus is connected to the said control line, The electric power generation system which transmits the information regarding the presence or absence of the disconnection of the said current transformer to the said electric power generation apparatus via the said control line to the said electric power information. In claim 1,
The disconnection detection unit is a power generation system that detects disconnection of the current transformer by applying a voltage to the disconnection detection member.

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