Abstract: The cogeneration system includes: a cogeneration apparatus which generates electric power using supplied fuel gas and supplies the electric power and heat; a heat accumulator which accumulates the heat supplied by the cogeneration apparatus; a controller which controls at least start and stop of the cogeneration apparatus; and a display unit that displays a remaining power generation duration which is a length of time for which the cogeneration apparatus can continue power generation. The controller further calculates the remaining power generation duration based on a remaining heat accumulation capacity which is a difference between (a) a maximum accumulable heat amount which is the amount of heat the heat accumulator is capable of accumulating and (b) a current accumulated heat amount that is the amount of heat currently accumulated in the heat accumulator, and causes the display unit to display the calculated remaining power generation duration.

Abstract: An autonomous distribution board receives feeding of power via a distribution board for a period during which grid power is supplied from a grid power source, while receiving power via an autonomous terminal of a power conversion apparatus for a period during which supplying of grid power from grid power source is stopped. Autonomous distribution board is connected with a specific load and the like. A measurement point switching apparatus is configured to select one from a current sensor configured to monitor a current that flows through a main breaker, and a current sensor configured to monitor a current that is supplied from power conversion apparatus to autonomous distribution board. A fuel battery is configured to adjust an output thereof based on an output of the selected one so that power by fuel battery is consumed by a general load, specific load and the like.

Abstract: An autonomous distribution board receives feeding of power via a distribution board for a period during which grid power is supplied from a grid power source, while receiving power via an autonomous terminal of a power conversion apparatus for a period during which supplying of grid power from grid power source is stopped. Autonomous distribution board is connected with a specific load and the like. A measurement point switching apparatus is configured to select one from a current sensor configured to monitor a current that flows through a main breaker, and a current sensor configured to monitor a current that is supplied from power conversion apparatus to autonomous distribution board. A fuel battery is configured to adjust an output thereof based on an output of the selected one so that power by fuel battery is consumed by a general load, specific load and the like.

Abstract: A distributed power supply system is configured to execute a process for determining whether or not to permit a diagnostic process in such a manner that it is determined whether or not a difference between a set upper limit value and an actual measurement current value is not less than a load current value, the set upper limit value being a predetermined upper limit value set with respect to a detected current of a current sensor, the measurement current value being detected by the current sensor in a state where the diagnostic process is not executed, and the load current value being a value of a current flowing from a commercial power utility to a power load during execution of the diagnostic process; and if it is determined that the difference is not less than the load current value, the controller permits the diagnostic process.

Abstract: The cogeneration system includes: a cogeneration apparatus which generates electric power using supplied fuel gas and supplies the electric power and heat; a heat accumulator which accumulates the heat supplied by the cogeneration apparatus; a controller which controls at least start and stop of the cogeneration apparatus; and a display unit that displays a remaining power generation duration which is a length of time for which the cogeneration apparatus can continue power generation. The controller further calculates the remaining power generation duration based on a remaining heat accumulation capacity which is a difference between (a) a maximum accumulable heat amount which is the amount of heat the heat accumulator is capable of accumulating and (b) a current accumulated heat amount that is the amount of heat currently accumulated in the heat accumulator, and causes the display unit to display the calculated remaining power generation duration.

Abstract: A distributed power generation system includes: an inverter connected to the first connection point; a first power generation device, a current sensor provided on the electric wire in a position between the utility power supply and the first connection point; and a controller wherein in a case where a current flowing in a direction from the first connection point to the power supply utility is a positive current, the controller determines that there is an abnormality in an installation state of the current sensor, or performs notification of the abnormality in the installation state of the current sensor, when an electric power difference obtained by subtracting electric power consumed in the power load from the electric power output from the inverter is greater than a first threshold which is greater than 0.

Abstract: The distributed power generation system includes: an inverter connected to the first connection point; a first power generator; a current sensor provided on the power line between the commercial power supply and the first connection point; and a controller. In a case where a current flowing in a direction from the first connection point to the commercial power supply is a positive current, in a state where the inverter is disconnected, the controller determines that there is an abnormality in an installation state of the current sensor, or gives a notification of the abnormality in the installation state of the current sensor, if differential power that is obtained by subtracting power consumed by the electrical load from output power of the inverter is greater than a first threshold greater than 0.

Abstract: A distributed power supply system of the present invention comprises a distributed power supply apparatus (4) for supplying electric power to a customer load (2) interactively with a commercial electric power utility (1); an internal load (7) supplied with electric power from the commercial electric power utility; a current sensor (5a, 5b) for detecting a magnitude of a current and a direction of the current, the current being in a location closer to the commercial electric power utility than the internal load and the customer load; and a controller (8); wherein in a state where the distributed power supply apparatus 84) is not generating the electric power, the controller causes the internal load (7) to actuate, performs determination control as to an installation state of the current sensor (5a, 5b) plural times based on a value detected by the current sensor, and performs the determination control in such a manner that at least one of plural intervals at which the determination control is performed is set

Abstract: A power converter of the present invention is configured to convert DC power generated by a power generator (1) into AC power. The power converter includes: a boost converter circuit (3) configured to boost an output voltage of the power generator (1); an inverter circuit (5) configured to convert an output voltage of the boost converter circuit (3) into AC power and to interconnect the AC power with a power system (2); a buck converter circuit (8) configured to perform power conversion of output power of the boost converter circuit (3) and to supply resultant power to an internal load (60); and a controller (9). The controller (9) is configured to control the output voltage of the boost converter circuit (3) to be lower than or equal to a second voltage value which is less than the maximum value of AC voltage of the power system (2), in a case of supplying output power of the power generator (1) to the internal load (60) via the boost converter circuit (3) and the buck converter circuit (8).

Abstract: A power converter of the present invention is configured to convert DC power generated by a power generator (1) into AC power. The power converter includes: a boost converter circuit (3) configured to boost an output voltage of the power generator (1); an inverter circuit (5) configured to convert an output voltage of the boost converter circuit (3) into AC power and to interconnect the AC power with a power system (2); a buck converter circuit (8) configured to perform power conversion of output power of the boost converter circuit (3) and to supply resultant power to an internal load (60); and a controller (9). The controller (9) is configured to control the output voltage of the boost converter circuit (3) to be lower than or equal to a second voltage value which is less than the maximum value of AC voltage of the power system (2), in a case of supplying output power of the power generator (1) to the internal load (60) via the boost converter circuit (3) and the buck converter circuit (8).

Abstract: A distributed power generation system of the present invention is a distributed power generation system connected to a three-wire electric power system including first to third electric wires, the third electric wire being a neutral wire, and includes: an electric power generator (105); a connection mechanism (110) configured to connect any two electric wires among the first to third electric wires (101a to 101c) to an internal electric power load (111); a first current sensor (109a) set so as to detect a current value of the first electric wire (101a); a second current sensor (109b) set so as to detect a current value of the second electric wire (101b); and an operation controller (112) configured to determine the electric wire on which each of the first current sensor (109a) and the second current sensor (109b) is provided and an installing direction of each of the first current sensor (109a) and the second current sensor (109b) by determining whether or not the amount of change in the current value detecte

Abstract: A distributed power supply system is configured to execute a process for determining whether or not to permit a diagnostic process in such a manner that it is determined whether or not a difference between a set upper limit value and an actual measurement current value is not less than a load current value, the set upper limit value being a predetermined upper limit value set with respect to a detected current of a current sensor, the measurement current value being detected by the current sensor in a state where the diagnostic process is not executed, and the load current value being a value of a current flowing from a commercial power utility to a power load during execution of the diagnostic process; and if it is determined that the difference is not less than the load current value, the controller permits the diagnostic process.

Abstract: A fuel cell system (1) comprises a fuel cell unit (10); and a control unit (20); the control unit including: an allowable operation time setting section (22) which sets an allowable operation time (T6) of the fuel cell unit for each unit period (T3); and an operation control section (21) which operates the fuel cell unit such that an actual operation time (T7) of the fuel cell unit per unit period is not more than the allowable operation time; the allowable operation time setting section calculates an accumulated value of reference values (T5) of the allowable operation time for each unit period which correspond to past all unit periods and an accumulated value of values of the actual operation time for each unit period which correspond to past all unit periods, the reference values of the allowable operation time for each unit period being set based on the durable operation time (T2) and the guaranteed usage period (T1); and if a remaining operation time (T9) which is a difference value between the accumulat

Abstract: Provided are a toilet seat device saving energy and accurately stabilizing the temperature of a seating section at a predetermined level in a short time, and a toilet apparatus having the same. A control section adjusts the temperature of a toilet seat section to 18° C. when a heating function is turned on, and during a standby period D1, the control section performs low electric power drive of a lamp heater provided at the toilet seat section. The control section starts 600 W drive of the lamp heater at time t1 after the control section detects user's entry into a room, and the control section maintains the 600 W drive during an inrush current reduction period D2. The control section starts 1200 W drive of the lamp heater at time t2 and maintains the 1200 W drive during a first temperature rise period D3.

Abstract: A distributed power supply system of the present invention comprises a distributed power supply apparatus (4) for supplying electric power to a customer load (2) interactively with a commercial electric power utility (1); an internal load (7) supplied with electric power from the commercial electric power utility; a current sensor (5a, 5b) for detecting a magnitude of a current and a direction of the current, the current being in a location closer to the commercial electric power utility than the internal load and the customer load; and a controller (8); wherein in a state where the distributed power supply apparatus 84) is not generating the electric power, the controller causes the internal load (7) to actuate, performs determination control as to an installation state of the current sensor (5a, 5b) plural times based on a value detected by the current sensor, and performs the determination control in such a manner that at least one of plural intervals at which the determination control is performed is set

Abstract: Provided are a toilet seat device saving energy and accurately stabilizing the temperature of a seating section at a predetermined level in a short time, and a toilet apparatus having the same. A control section adjusts the temperature of a toilet seat section to 18° C. when a heating function is turned on, and during a standby period D1, the control section performs low electric power drive of a lamp heater provided at the toilet seat section. The control section starts 600 W drive of the lamp heater at time t1 after the control section detects user's entry into a room, and the control section maintains the 600 W drive during an inrush current reduction period D2. The control section starts 1200 W drive of the lamp heater at time t2 and maintains the 1200 W drive during a first temperature rise period D3.