JP5818825B2 - MONITORING DEVICE, MONITORING METHOD, AND PROGRAM - Google Patents

Description

  The present invention relates to a monitoring device, a monitoring method, and a program.

  Along with the increasing demand for energy management, there is a demand for a device that can easily determine the operating states of a plurality of electrical devices in a house. Patent Document 1 discloses an electrical equipment monitoring system that estimates operation states of a plurality of electrical equipments in a house using measurement data of a measurement sensor installed in the vicinity of a feed line inlet.

JP 2000-292465 A

  In recent years, an increasing number of houses are installed with power generation devices such as solar power generation systems and power storage devices. In such a house, electric power is supplied not only from the feeder line but also from the power generation device and the power storage device. Therefore, in the system as shown in Patent Document 1 that monitors only the feed line inlet, the operating state of the electric device cannot be determined with high accuracy.

  The present invention has been made in view of such problems, and provides a monitoring device, a monitoring method, and a program that can accurately determine the operating state of an electrical device even when a power generation device or a power storage device is installed. With the goal.

The monitoring device of the present invention is a device that determines the operating state of an electrical device connected to a power supply system to which at least one of a power generation device and a power storage device is connected. Monitoring device includes a sensor current output from the current sensor for detecting a current flowing from the outside to the power supply system, and a sensor current at least one output from a current sensor for detecting a current generated in the power generating device and the power storage device a synthetic unit that forms case, power generator and power storage device at least one storage means for storing a feature quantity of a current to be generated, the sensor current output from a plurality of current sensors installed in a plurality of positions of power system The sensor data from the current sensor for detecting the current generated by at least one of the power generation device and the power storage device is discriminated from the plurality of sensor currents by acquiring the measurement data of Current discriminating means, sensor current output from a current sensor for detecting current flowing into the power supply system from the outside, and current discriminating means And setting means for inputting and discriminated sensor current combining means, and a operating condition judging means for judging the operation state of the electrical device based on the synthesized current synthesized in the synthesizing means.

  ADVANTAGE OF THE INVENTION According to this invention, even if the electric power generating apparatus and the electrical storage apparatus are installed, the monitoring apparatus, the monitoring method, and program which can discriminate | determine the operation state of an electric equipment accurately can be provided.

It is a figure for demonstrating the structure of the monitoring apparatus which concerns on embodiment of this invention. It is a functional block diagram for demonstrating the function which the control part shown in FIG. 1 has. It is a flowchart for demonstrating an operation state discrimination | determination process. 3 is a flowchart for explaining a setting process according to the first embodiment. 10 is a flowchart for explaining a setting process according to the second embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Embodiment 1)
The monitoring device 100 according to the embodiment of the present invention is a device for determining the operating state of the electrical device 500 connected to the power supply system 200 (for example, whether the electrical device 500 is operating or stopped).

  The power supply system 200 is a single-phase three-wire power source that includes a voltage line L1, a neutral line N, and a voltage line L2. As shown in FIG. 1, the power supply system 200 includes a main breaker 210 and branch breakers 220 to 250. The branch breakers 220 to 250 are connected to a power generation device 300 such as a solar power generation system, a power storage device 400 such as a lithium ion battery, and an electric device 500 such as a refrigerator and a washing machine, respectively. Note that the power generation device 300 and the power storage device 400 include a power conditioner inside and can be directly connected to a single-phase three-wire power source.

  Hereinafter, the configuration of the monitoring apparatus 100 will be described in detail.

  As shown in FIG. 1, the monitoring device 100 includes a voltage measurement circuit 110, current measurement circuits 121 to 125, switches 131 to 135, a synthesis unit 140, a filter unit 150, a control unit 160, and a storage unit 170. And an external interface 180.

  The voltage measurement circuit 110 is a circuit for converting the power supply voltage to a voltage level that can be measured by the control unit 160. The voltage measurement circuit 110 includes, for example, a resistance voltage dividing circuit, a transformer (PT: Potential Transformer), and the like. The voltage measurement circuit 110 transforms the power supply voltage and outputs it to the control unit 160.

  The current measurement circuits 121 to 125 are circuits for converting the output from the current sensor into a voltage level that can be measured by the control unit 160. The current measurement circuits 121 to 125 are composed of, for example, a load resistor and an operational amplifier. The current measurement circuits 121 to 125 are connected to the switches 131 to 135, respectively. The current measurement circuits 121 to 125 are connected to clamp-type current sensors 121a, 121b, 122a, 123a, 124a, 124b, 125a, and 125b, respectively.

  The current sensors 121a and 121b are sensors for detecting a current flowing into the power supply system 200 from the outside. Current sensors 121a and 121b are installed on voltage lines L1 and L2 from a power supply line inlet (not shown) to main breaker 210.

  The current sensors 122a and 123a are sensors for detecting a current flowing into the electric device 500. The current sensor 122 a is installed on the voltage line L <b> 2 between the branch breaker 220 and the electric device 500. In addition, the current sensor 123 a is installed on the voltage line L <b> 1 between the branch breaker 230 and the electric device 500.

  The current sensors 124a and 124b are sensors for detecting a current generated by the power generation device 300. Current sensors 124 a and 124 b are installed on voltage lines L 1 and L 2 between branch breaker 240 and power generation device 300.

  Current sensors 125 a and 125 b are sensors for detecting a current generated by power storage device 400. Current sensors 125 a and 125 b are installed on voltage lines L 1 and L 2 between branch breaker 250 and power storage device 400.

  Each current sensor is a current transformer (CT: Current Transformer) in which a coil is wound around a magnetic core, and generates a secondary current by transforming a current flowing through each electric wire at a predetermined current transformation ratio. Then, the generated secondary current is output to the current measurement circuits 121 to 125 (hereinafter, the current output from the current sensor is referred to as “sensor current”).

  The switches 131 to 135 are composed of semiconductor switches such as FET (Field Effect Transistor). The switches 131 to 135 are connected to the current measurement circuits 121 to 125 and the combining unit 140, respectively. The switches 131 to 135 turn the switches on or off according to the control of the control unit 160.

  The synthesizer 140 includes an adder circuit that synthesizes the sensor current. The adder circuit is composed of a semiconductor element such as an operational amplifier. The synthesizer 140 synthesizes the sensor currents input from the current measurement circuits 121 to 125 via the switches 131 to 135 and outputs them to the filter unit 150. Note that when the number of turns in the current transformer, the load resistance value and the amplification factor in the current measurement circuit are different, the magnification of each sensor current with respect to the measurement current is adjusted and added.

  The filter unit 150 includes a filter circuit such as a band pass filter, a low pass filter, and a high pass filter. The filter unit 150 outputs only a signal in a specific frequency band among the signals output from the synthesis unit 140 to the control unit 160. In addition, the pass band of the filter unit 150 is set to a frequency band in which a feature easily appears for each device.

  The control unit 160 includes a processing device such as a processor. The control unit 160 operates according to a program stored in a ROM (Read Only Memory) or a RAM (Random Access Memory) (not shown), and executes various operations including an “operation state determination process” described later. The control unit 160 operates according to the “operation state determination process”, so that as illustrated in FIG. 2, the measurement unit 161, the current determination unit 162, the power calculation unit 163, the setting unit 164, and the data extraction unit 165. And function as an operation state determination unit 166. Note that the operation of these functions will be described later in the description of “operation state determination processing”.

  Returning to FIG. 1, the storage unit 170 includes a storage device such as a DRAM (Dynamic Random Access Memory), an SRAM (Static Random Access Memory), a flash memory, and a hard disk. The storage unit 170 stores dictionary data used in an operation state determination process described later. The “dictionary data” is data in which a device feature amount obtained by extracting a feature of a harmonic current generated in the power supply system 200 when the electric device 500 is operated and identification information of the electric device 500 are associated with each other. Further, “current information” is stored in the storage unit 170 by an apparatus installer or the like. The “current information” is information for specifying a sensor current for measuring the output current of the power generation device 300 or a sensor current for measuring the output current of the power storage device 400 from among a plurality of sensor currents.

  The external interface 180 includes an external device connection interface such as a USB (Universal Serial Bus) cable connection device or a LAN (Local Area Network) cable connection device. When the external interface 180 is instructed to monitor the operation state of the electric device 500 from an external device (not shown), the external interface 180 transmits the instruction to the control unit 160 and also displays the operation state of the electric device 500 determined by the control unit 160. Send to device.

  Next, the operation of the monitoring apparatus 100 having such a configuration will be described.

  The control unit 160 starts “operation state determination processing” when an external device (not shown) is instructed to monitor the operation state of the electric device 500. Hereinafter, the “operation state determination process” will be described with reference to the flowchart of FIG. 3.

  The measurement unit 161 of the control unit 160 operates the A / D converter included in the control unit 160 and acquires measurement data of the voltage output from the voltage measurement circuit 110. Moreover, the measurement part 161 operates the A / D converter with which the control part 160 is provided, and acquires the measurement data of the sensor current which the current measurement circuits 121-125 output (step S110).

  The control unit 160 executes “setting processing” for determining the sensor current to be input to the synthesis unit 140 by turning the switches 131 to 135 ON or OFF (step S120). The “setting process” will be described below with reference to the flowchart of FIG.

  Based on the current information stored in the storage unit 170, the current determination unit 162 of the control unit 160 uses a current sensor that measures the output current of the power generation device 300 from among a plurality of measurement data acquired in step S110. The output sensor current measurement data and the sensor current measurement data output from the current sensor that measures the output current of the power storage device 400 are specified (step S121).

  The power calculation unit 163 calculates the current output power of the power generation device 300 and the power storage device 400 using the measurement data identified in step S121 and the measurement data of the voltage output from the voltage measurement circuit 110, respectively (step S122). .

  The setting unit 164 of the control unit 160 determines whether or not the output power of the power generation device 300 is equal to or greater than a predetermined threshold value, and when it is equal to or greater than the predetermined threshold value, the switch 134 is turned on. In addition, setting unit 164 determines whether or not the output power of power storage device 400 is equal to or greater than a predetermined threshold value. In addition, the setting unit 164 turns on the switch 131 and inputs the sensor current output from the current measurement circuit 121 that measures the current flowing into the main breaker 210 to the synthesis unit 140. The other switches are turned off (step S123). Thereby, the sensor currents of all the current sensors that measure the electric wires that supply power to the power supply system 200 are combined by the combining unit 140. The combined current (hereinafter referred to as “combined current”) passes through the filter unit 150 and is input to the control unit 160.

  Returning to the flow of FIG. 3, the measurement unit 161 operates the A / D converter included in the control unit 160 to acquire measurement data of the combined current output from the filter unit 150 (step S <b> 130).

  The data extraction unit 165 of the control unit 160 performs time-frequency conversion (for example, Fourier transform, wavelet transform, and Chirplet transform) on the synthesized current, and the device features the current of each frequency of the synthesized current and the data regarding the phase with respect to those voltages. Extracted as a quantity (step S140).

The operation state determination unit 166 of the control unit 160 compares the device feature amount extracted in step S140 with the dictionary data stored in the storage unit 170, and all the electric devices 500 connected to the power supply system 200 are currently registered. It is determined what state it is in (for example, whether it is operating or not operating) (step S150).
Note that the method of determining the operating state of the electric device 500 from the current measurement data is not limited to the above method, and various known methods can be used. For example, you may discriminate | determine using the method similar to patent document 1. FIG.

  The operation state determination unit 166 outputs the operation state of the electric device 500 determined in step S150 to the external device via the external interface 180 (step S160). When the output is completed, the control unit 160 ends the “operation state determination process”.

  According to the present embodiment, the state of the electrical device is analyzed using the combined current obtained by combining the sensor currents from the current sensors installed in the electric wires that supply power to the power supply system 200. Even in the power supply system to which the power storage device is connected, the operating state of the electrical device can be determined with high accuracy.

  In addition, when synthesizing sensor currents by digital processing, it is necessary to synchronize the time at which each current is sampled, and high speed or multiple A / D converters are required. In the present embodiment, since the sensor current is synthesized using the adder circuit, it is not necessary to prepare a high-speed or a plurality of A / D converters in the monitoring apparatus 100. As a result, the monitoring device 100 can be configured at a low cost.

(Embodiment 2)
In the first embodiment, the sensor current input to the combining unit 140 is determined based on the current information stored in advance in the storage unit 170 by the apparatus installer. However, the characteristics of the current output by the power generation device 300 and the power storage device 400 are determined. Based on this, it is also possible for the apparatus to automatically determine the sensor current input to the combining unit 140. Hereinafter, the monitoring apparatus 100 that automatically determines the sensor current input to the combining unit 140 will be described.

  The monitoring device 100 includes a storage unit 170 as shown in FIG. In addition to the “dictionary data” described in the first embodiment, the storage unit 170 stores “feature data” that describes the characteristics of the current generated by the power generation device 300 and the power storage device 400.

  Since the other structure of the monitoring apparatus 100 is the same as that of Embodiment 1, description is abbreviate | omitted. The operation of the monitoring apparatus 100 shown in FIG. 3 is the same except for the “setting process” in step S120, and a description thereof will be omitted. The “setting process” will be described below with reference to the flowchart of FIG.

  The current determination unit 162 of the control unit 160 selects one of the switches 131 to 135. Then, the selected switch is turned on and the other switches are turned off (step S221).

  The measurement unit 161 of the control unit 160 acquires the measurement value of the output current of the filter unit 150 (step S222).

  The current discriminating unit 162 performs time-frequency conversion on the output current of the filter unit 150, and extracts data on the current of each frequency of the output current and the phase with respect to those voltages (step S223).

  The current determination unit 162 collates the extracted data with the feature amount data, and the sensor current input to the combining unit 140 is the sensor current output from the current sensor that measures the output current of the power generation device 300 or the power storage device 400. It is determined whether the sensor current is output from a current sensor that measures the output current or the sensor current output from other current sensors. The current determination unit 162 stores the determination result in the storage unit 170 (step S224).

  The current determination unit 162 determines whether any of the switches 131 to 135 has not yet been turned on (step S225). If there is a switch that has not been turned on, the process returns to step S221 (step S225: Yes). When all the switches are turned on, the process proceeds to step S226 (step S225: No).

  The setting unit 164 of the control unit 160 turns on or off the switches 131 to 135 based on the determination result determined in step S224 (step S226). In the monitoring apparatus 100 shown in FIG. 1, the switch 131, the switch 134, and the switch 135 are turned on, and the other switches are turned off. When the setting is completed, the control unit 160 ends the setting process.

  According to the present embodiment, since the monitoring apparatus 100 automatically determines the sensor current input to the combining unit 140, current information is created and stored in the storage unit 170 each time the apparatus installer installs the apparatus. No need to save.

  The above-described embodiment is an example, and various changes and applications are possible.

  For example, in the above-described embodiment, the current sensor is described as a clamp-type current sensor. However, the current sensor is not limited to a clamp-type current sensor, and may be a non-contact current sensor such as a Hall current sensor. Good. Moreover, the shunt which shunts the electric current which flows into an electric wire may be sufficient. In this case, the sensor current may be a shunt current.

  In the above-described embodiment, the power supply system 200 is described as a single-phase three-wire power supply. However, the power supply system 200 is not limited to a single-phase three-wire power supply, and may be a single-phase two-wire power supply, for example.

In the above-described embodiment, the synthesis unit 140 and the filter unit 150 are described as electric circuits.
The functions of the synthesis unit 140 and the filter unit 150 may be incorporated into the control unit 160 and the functions of the synthesis unit 140 and the filter unit 150 may be realized by digital signal processing.

  In the above-described embodiment, the control unit 160 has been described as functioning as the measurement unit 161, the current determination unit 162, the power calculation unit 163, the setting unit 164, the data extraction unit 165, and the operation state determination unit 166. These functions need not be realized by a single processor, and may be realized by a plurality of processors. Moreover, while constructing these functions in a server on the cloud, the monitoring apparatus 100 may have a network connection function, and the monitoring apparatus 100 may be configured to receive the processing results of each function from the server.

  Monitoring device 100 of the present embodiment may be realized by a dedicated system or an ordinary computer system. For example, the monitoring apparatus 100 may be configured by storing and distributing a program for executing the above-described operation in a computer-readable recording medium, installing the program in a computer, and executing the above-described processing. Good. Further, it may be stored in a disk device provided in a server device on a network such as the Internet so that it can be downloaded to a computer, for example. Further, the above-described functions may be realized by joint operation of the OS and application software. In this case, only the part other than the OS may be stored and distributed in a medium, or may be downloaded to a computer.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention and do not limit the scope of the present invention. In other words, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

  DESCRIPTION OF SYMBOLS 100 Monitoring apparatus, 110 Voltage measuring circuit, 121-125 Current measuring circuit, 121a, 121b, 122a, 123a, 124a, 124b, 125a, 125b Current sensor, 131-135 switch, 140 composition part, 150 filter part, 160 control part 161 Measurement unit 162 Current determination unit 163 Power calculation unit 164 Setting unit 165 Data extraction unit 166 Operation state determination unit 170 Storage unit 180 External interface 200 Power supply system 210 Core breaker 220-250 Branch Breaker, 300 power generation device, 400 power storage device, 500 electrical equipment.

Claims (3)

A monitoring device for determining an operating state of an electrical device connected to a power supply system to which at least one of a power generation device and a power storage device is connected,
A sensor current output from a current sensor that detects a current flowing into the power supply system from outside and a sensor current output from a current sensor that detects a current generated by at least one of the power generation device and the power storage device are combined. and synthesizing means for,
Storage means for storing a characteristic amount of current generated by at least one of the power generation device and the power storage device;
Obtaining sensor current measurement data output from a plurality of current sensors installed in a plurality of locations of the power supply system, by collating the measurement data with the feature amount, from among a plurality of sensor currents, Current discriminating means for discriminating a sensor current from a current sensor for detecting a current generated by at least one of the power generation device and the power storage device;
Setting means for inputting the sensor current output from the current sensor for detecting the current flowing into the power supply system from the outside and the sensor current determined by the current determination means to the combining means;
An operation state determination unit that determines an operation state of the electrical device based on the combined current combined by the combining unit;
Comprising
Monitoring device. A monitoring method for determining an operating state of an electrical device connected to a power supply system to which at least one of a power generation device and a power storage device is connected,
Measurement data of sensor currents output from a plurality of current sensors installed at a plurality of locations of the power supply system is acquired, and the measurement data is stored in advance as currents generated by at least one of the power generation device and the power storage device A current determination step of determining a sensor current from a current sensor that detects a current generated by at least one of the power generation device and the power storage device from among a plurality of sensor currents by collating with a feature amount that is performed;
A synthesis step of adding and synthesizing the sensor current output from a current sensor that detects a current flowing into the power supply system from the outside and the determined sensor current;
Determining an operating state of the electrical device based on the combined combined current,
Monitoring method. A computer for determining an operating state of an electric device connected to a power supply system to which at least one of a power generation device and a power storage device is connected;
Measurement data of sensor currents output from a plurality of current sensors installed at a plurality of locations of the power supply system is acquired, and the measurement data is stored in advance as currents generated by at least one of the power generation device and the power storage device A function of discriminating a sensor current from a current sensor that detects a current generated by at least one of the power generation device and the power storage device from among a plurality of sensor currents by collating with a feature amount being
A function of adding and synthesizing the sensor current output from the current sensor that detects the current flowing into the power supply system from the outside and the determined sensor current;
Realizing a function of determining an operating state of the electrical device based on the synthesized current synthesized;
program.

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