JP2000014167A - Inverter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily set and verify various setting values by transmitting and receiving existing setting values and new setting values of an inverter body between display units in a system interface control circuit, based on the setting values of operation unit. SOLUTION: A DC power from a solar battery 8 is converted into an AC power in a DC/AC inverter 9, and the commercial power and an output voltage from the solar battery 8 are supplied to a housing load 13, via a branching breaker of power distribution panel in the interface condition connected to the commercial power supply system 1 with an opening switch 1. System a frequency and irregularity in the voltage of discrete type power supply 7 and power failure of commercial power supply are detected with a system interface control circuit 12, using a voltage/current signal from a sensor 10c. Irregularity or no irregularity in such a rise or drop or the like of voltage and frequency is determined by an operation unit 10i or the like with reference to preset voltage and frequency ranges. When various setting values of an inverter 10a are received by a display unit 10d as the data signal, it is displayed on the display element 10h and is received by the control circuit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device, and more particularly, to an inverter device for converting a DC power supply such as a solar cell into an AC power and supplying power to a load in connection with a commercial power system. .

[0002]

2. Description of the Related Art A DC power supply such as a solar cell is converted into an AC power.
An inverter device that supplies power to a load in connection with a commercial power supply system is referred to as a grid-connected inverter device, and includes an inverter device illustrated in FIGS. 3 and 4. FIG. 3 is a schematic configuration diagram of the photovoltaic power generation system, and FIG. 4 is an explanatory diagram of a basic configuration of the photovoltaic power generation system.

In FIG. 3, reference numeral 1 denotes a power system of a commercial power supply, which includes a main power supply 2 of a power plant, a power plant 3 for reducing the power from the power plant 2 and distributing the power, and a cutoff provided on a distribution line 4. And a pole transformer 6 that steps down the supplied power and supplies it to each home.

[0004] Reference numeral 8 denotes a solar cell installed in each home.
The distributed power supply 7 includes an inverter 9 that converts a DC voltage output from the solar cell 8 into an AC voltage.

[0005] Reference numeral 12 denotes a grid connection protection circuit, which is controlled by the commercial power supply system 1 and the distributed power supply 7 at the same time as a load 13 in the house.
When power is supplied to the switch, the parallel-off switch 1
1 to disconnect the distributed power supply 7 from the commercial power supply system 1. The grid connection protection circuit 12 controls the frequency fluctuation and voltage fluctuation in the system of the distributed power supply 7 or the power system 1 of the commercial power supply.
A function of detecting the occurrence of a power failure due to the opening of the circuit breaker 5 and disconnecting the disconnection switch 11.

In the above-described solar power generation system,
When DC power is output from the solar cell 8, the inverter 9
Is converted into AC power of a predetermined frequency and the AC power is supplied to the load 13 in the house. On the other hand, the power that cannot be covered by the AC power from the distributed power source is generated by the power system 1 of the commercial power source.
Supplied from

In the basic configuration of the photovoltaic power generation system shown in FIG. 4, reference numeral 8 denotes a solar cell, and reference numeral 10 denotes a grid-connected inverter device. The system interconnection type inverter device 10 includes the inverter 9 described above, a parallel-off switch 11,
And a system interconnection protection circuit 12. Further, the inverter device 10 has a display unit 15 connected by a cable 14.

[0008] The display unit 15 is for allowing the user to easily grasp the power generation state of the distributed power supply. And by the power generation of the solar cell 8 of the distributed power supply,
In addition to displaying the amount of generated power, the integrated power, and the like, the power generation efficiency of the distributed power source is constantly monitored to detect an abnormal state such as a decrease in power generation efficiency, and to notify the user of the maintenance and inspection time.

[0009]

In the inverter device configured as described above, various setting values can be set in the inverter device 10 itself.
Thus, for example, when power having a voltage or frequency outside the set value range is supplied from the commercial power supply system 1, the inverter device is stopped, or the voltage output to the house load 13 is controlled to a certain set value. It is possible to do. Further, when the power supply from the commercial power supply system 1 is stopped due to a power distribution accident or the like, and the power supply is restarted from the commercial power supply system 1, when the power supply is started, the solar cell 1 is interconnected after a predetermined time has elapsed. It is possible to do.

However, in the conventional inverter device 10, the above-described setting must be performed by a setting switch (not shown) provided on the main body of the inverter device 10, and the like.
There is a problem that it is troublesome to set various setting values depending on a place where the inverter device 10 is installed. Similarly, in order to check how various setting values are set in the main body of the inverter device 10, it is necessary to check the scale of a setting switch at a place where the inverter device 10 is installed. There is a problem that the work of confirming the set value is also troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to easily set various set values and to set the set values. An object of the present invention is to provide an inverter device capable of easily performing confirmation.

[0012]

According to the first aspect of the present invention,
An operating device for inputting various setting values used in the inverter body, a transmitting and receiving circuit for transmitting the setting values input in the operating device to the inverter body and receiving various setting values currently used in the inverter body, A display unit having a display element for displaying set values set in the operation device and various set values used in the inverter body, and an inverter unit for converting DC power input from a DC power supply into AC and outputting the AC power When,
A system interconnection control circuit that controls the inverter unit based on the set value set, and a transmission / reception circuit that transmits an existing set value to the display unit and receives a newly set value from the display unit And an inverter main body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an explanatory diagram of the basic configuration of the inverter device. FIG. 2 is a circuit block diagram of the inverter device. Note that the same reference numerals are given to portions equivalent to those shown in the conventional embodiment, and the detailed description thereof will be omitted.

The distributed power source 7 includes a solar cell 8 and an inverter device 10 as a power converter. The inverter device 10 includes an inverter body 10a,
The display unit 10d is a display unit.

As shown in FIG. 2, the inverter body 10a includes a DC / AC inverter 9 as an inverter, a parallel-off switch 11, and a system interconnection control circuit 12. The display unit 10d includes a display control circuit 10f, a storage unit 10g, and a display element 10h that displays the operation state of the DC / AC inverter 9 of the inverter body 10a and various set values.

The DC / AC inverter 9 is an inverter unit for converting DC power input from the solar cell 8 as a DC power supply into AC and outputting the AC power. Supply AC power to

The disconnecting switch 11 is a switch for disconnecting the distributed power supply 7 from the commercial power supply system 1 at the time of interconnection, and is controlled by a system interconnection control circuit 12.

The system interconnection control circuit 12 is a signal conversion unit for converting the contents of the operation state of the DC / AC inverter 9 into a predetermined data signal. It is configured to have a CPU circuit (not shown) for controlling the inverter main body 10a by detecting the voltage fluctuation or the occurrence of the power failure of the commercial power supply system 1. The inverter body 10a is controlled based on set values such as an abnormality detection condition, a stop condition, and an output suppression condition set by an operation device 10i of a display unit 10d described later.

The system interconnection control circuit 12 includes the sensor unit 1
A signal from a voltage sensor and a current sensor provided at 0c is input, and a control signal for controlling the DC / AC inverter 9 is output. In addition, the system interconnection control circuit 12 receives the voltage signal and the current signal from the sensor unit 10c, and
The system detects the frequency abnormality and the voltage abnormality in the system or the power failure of the commercial power supply system, controls the disconnection switch 11, and disconnects the distributed power supply 7 from the commercial power supply system 1. Further, the system interconnection control circuit 12 displays the D on the display unit 10d.
Calculation of data for displaying the contents of the operation state of the C / AC inverter 9 and conversion of the calculation result into a predetermined data signal. Similarly, what kind of set value is currently operated is also converted into a data signal.

The display control circuit 10f is a signal processing circuit that outputs output data and set value data of the CPU circuit of the system interconnection control circuit 12 to the display element 10h, and controls the operation state of the inverter unit and the contents of the set values. A CPU circuit for calculating and displaying is provided, and the display content of the display element 10h is changed and displayed by a switch operation signal from the operation switch SW1 for changing the display content of the display element 10h. By the display control circuit 10f, the contents of the operation state of the DC / AC inverter 9 of the grid-connected inverter device 10 include, for example, output power, output power integrated amount, normal operation state, abnormal operation state, abnormality detection condition, stop The conditions, output suppression conditions, and the like are recognized in the arithmetic processing, and are output as display data of the display element 10h based on the operation of the operation switch SW1.

The storage circuit 10g is a circuit for temporarily storing the operation program of the CPU circuit of the display control circuit 10f and the contents of the operating state converted by the signal processing in the display control circuit 10f. RAM and EEP
This is a storage circuit composed of storage elements of a ROM.

The display element 10h includes an inverter body 10a.
This is a part for displaying the operation state and the contents of the set values of the DC / AC inverter 9 which is an inverter circuit of, for example, having a liquid crystal display element for displaying numerical data of a predetermined value. The output power, the integrated output power, various set values, and the like are sequentially displayed by the display element 10h based on the operation of the operation switch SW1.

The operation device 10i is composed of a numeric keypad or the like, and can set various set values set in the inverter device 10. The setting method is performed by first operating the operation switch SW1 to display a set value to be changed on the display element 10h, and then operating the operating device 10i to input a desired set value.

The transmission / reception circuits 10b and 10e are circuits for transmitting and receiving data signals. Transmitting and receiving circuits 10b, 10e
Data transmission and reception are performed by wire communication or wireless communication.

Next, the operation of the grid-connected inverter device 10 having the above configuration will be described. The inverter main body 10a of the system interconnection type inverter device 10 is installed, for example, in the vicinity of a distribution board such as a service opening of a kitchen in a house, and a display unit 10d is also provided on a predetermined wall surface of a kitchen or the like. It is installed at the height position. Therefore, if the display unit 10d is mounted at a position where the user can easily use it, setting and checking of various set values can be easily performed.

When DC power is output from the solar cell 8,
The DC / AC inverter 9 converts the power into AC power. Then, in a state where the solar battery 8 is connected to the commercial power system 1 by the disconnecting switch 11, that is, in a linked state, the electric power from the commercial power system 1 is supplied to the house load 13 via the branch breaker of the distribution board. The power output from is supplied.

At the same time as supplying this power, the sensor unit 10c
Frequency and voltage abnormalities in the system of the distributed power source 7 or the commercial power system 1
Is detected by the system interconnection control circuit 12. Then, it is determined whether or not there is an abnormality (a voltage rise, a voltage drop, a frequency rise, a frequency drop, etc.) based on a preset value (a predetermined voltage range and a predetermined frequency range) set using the operating device 10i or the like. Because

If it is determined that the power is normal, the DC power of the solar cell 8 is continuously converted into AC through the grid-connected inverter device 10 and supplied to the house load 13. Then, DC / A, which is the content of the operating state,
The data signal corresponding to the value of the output current and the output voltage of the C inverter 9 is transmitted.

The data signal transmitted from the system interconnection control circuit 12 is transmitted to the display element 10h via the display control circuit 10f.
Is displayed as the output power of the solar cell 8. Also,
The display control circuit 10f sequentially calculates the integrated amount of the output power from the temporal transition of the output current and the output voltage, and the storage circuit 1
0 g is stored. The integrated amount of the output power is displayed on the display element 10h by operating the operation switch SW1 of the display unit 10d as a display unit.

When it is determined that an abnormality has occurred or when a stop voltage has been detected, the system disconnection switch 11 is immediately opened by the system interconnection control circuit 12. Then, a data signal corresponding to the occurrence of the abnormality or the power failure is transmitted. This data signal is received by the display unit 10d, converted by the display control circuit 10f, and displayed by the display element 10h.

Further, various set values set in the inverter body 10a are transmitted as data signals,
When received by the display unit 10d, the display element 10h
Is displayed to that effect.

The set value set by the operation device 10i is displayed on the display element 10h and received by the system interconnection control circuit 12 via the transmission / reception circuits 10e and 10b. In the circuit 12, the set value is rewritten.

[0033]

As described above, according to the first aspect of the present invention, the operating device for inputting various setting values used in the inverter main body and the setting value input in the operating device are transmitted to the inverter main body. A transmission / reception circuit for receiving various setting values currently used in the inverter main body, and a display including a display element for displaying the setting values set in the operation device and the various setting values used in the inverter main body. A unit, an inverter unit that converts DC power input from a DC power supply into AC and outputs the converted AC power, a system interconnection control circuit that controls the inverter unit based on the set values, and a display unit that displays existing set values And a transmission / reception circuit that transmits to the display unit and receives the newly set value from the display unit. Because it was Unishi, set by the display unit attached to the operation position easy various set values,
Since the various set values that have been set can be confirmed on the display unit, various set values can be set easily, and the set values can be easily checked. This provides an effect that an inverter device can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a basic configuration of an inverter device.

FIG. 2 is a circuit block diagram of the inverter device.

FIG. 3 is a schematic configuration diagram of a solar power generation system.

FIG. 4 is an explanatory diagram of a basic configuration of a solar power generation system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial power supply system 7 Distributed power supply 8 Solar cell 9 DC / AC inverter (inverter part) 10 Inverter device 10a Inverter main body 10b Transmission / reception circuit 10d Display unit (display part) 10e Transmission / reception circuit 10g Storage part 10h Display element 10i Controller 11 Disconnection switch 12 System interconnection control circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoichi Kunimoto, Matsushita Electric Works Co., Ltd. 1048, Ojimon Kadoma, Kadoma, Osaka Pref. (72) Inventor Tadayoshi Mukai 1048 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd. (72) Inventor Hirotada Higashihama 1048 Odaka, Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd. Shinichiro 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture F-term within Matsushita Electric Works, Ltd. (reference) 5G066 HA13 HB05 5H007 AA12 AA17 BB07 DB12 DC02 DC05 FA01 FA02 GA09

Claims (1)

[Claims] An operation device for inputting various setting values used in an inverter body, a setting value input in the operation device is transmitted to the inverter body, and various setting values currently used in the inverter body are received. And a display unit having a display element for displaying a set value set in the operation device and various set values used in the inverter body, and converting DC power input from a DC power supply into AC. An output unit, a grid connection control circuit that controls the inverter unit based on the set value, and an existing set value transmitted to the display unit, and the newly set value is transmitted from the display unit. An inverter device comprising: an inverter main body including a transmission / reception circuit for receiving.