JPH1141816A - Solar generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control respective solar cell power supplies most favorably in view of system management, etc., by a method wherein an upper hierarchy controller for centralized control is provided and lower hierarchy controllers to which control information is given individually by the upper hierarchy controller are provided to control the operations of the respective solar cell power supplies. SOLUTION: A plurality of solar cell power supplies 1 and a slave main controller 2 which is a lower hierarchy controller which controls the power supplies 1 together are provided for each one of certain zones #1...#N. Further, a master main controller 3 which is a higher hirarchy controller is provided in a power plant, etc. The inverters 5 of the respective solar cell power supplies 1 of each one of the zones #1-#N are operated together by the slave main controller 2 of each zone. Further, the operations of the inverters 5 by the slave main controllers of the respective zones #1-#N are managed and controlled concentratively by the upper hierarchy master main controller 3. With this constitution, coordination between the slave main controllers 2 can be achieved and the solar cell power supplies can be controlled most favorably in view of system management, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed device formed by combining a solar cell and an inverter through a control device provided for each unit such as a fixed area such as a village or a town or a large-scale factory or building. The present invention relates to a large-scale solar power generation device that controls one or a plurality of solar cell power supplies of each unit as a power supply.

[0002]

2. Description of the Related Art Conventionally, a solar cell power supply as a so-called distributed power supply is formed by combining a solar cell and an inverter (AC array), and usually has a function of an interconnection operation and an independent operation.

[0003] Interconnection operation, depending on the state of the system, etc.
The mode is controlled to a self-sustained operation or an operation stop mode. In the interconnected operation and the self-sustained operation, the DC power of the solar cell is converted into AC power to supply power to a system load.

The interconnection operation mode is a normal operation mode of the system power supply. In this mode, the inverter is connected to the system power supply, and the system power supply and the AC power supply of the inverter synchronized with the power supply are connected to the system power supply. Power to the load.

In addition, the self-sustaining operation mode is an operation mode when a power failure occurs due to a disaster or the like. In this operation mode, the load is disconnected from the system power supply, and the inverter of the solar cell power supply operates. Driven independently,
The AC power is supplied to the load.

[0006] Conventionally, the operation of each inverter of each solar cell power supply is controlled independently and independently, and each solar cell power supply is individually operated.

[0007]

From the viewpoint of system management and the like, it is preferable to control each solar cell power supply in a factory, a building, a house, or the like, rather than individually.

In consideration of the number of controllable units and the control distance of one control unit, a control unit is provided for each fixed area such as a village or a town, or for each large factory or building. By region or its factory or building,
It is conceivable to control each solar cell power supply collectively.

However, even if collective control is performed for each region or each large-scale building such as a factory or a building, from the viewpoint of the entire system, each solar cell power supply is operated independently for each unit. Will be.

In this case, for example, even if the power supply of the system is interrupted due to the construction of the system or the like, there is a possibility that a solar cell power supply that switches from the interconnection operation to the self-sustained operation may be generated due to the interruption of the electric power, and the construction section can be reliably performed. There is a problem that the safety of the construction is not guaranteed.

In addition, since there is no coordination between the control devices, for example, the system voltage rises due to reactive power generated by a load, or an accident occurs in any section of the system, resulting in a system blackout. In such a case, there is a problem that the operation of each solar cell power supply cannot be controlled so as to be most convenient from the viewpoint of the entire system, and the system management cannot be improved.

According to the present invention, a control device is provided for each fixed area such as a village or a town, or for each large-scale factory or building, and when the solar cell power supplies in the area or the like are controlled collectively through this control device. Another object of the present invention is to control each solar cell power supply most conveniently in terms of system management and the like.

[0013]

In order to solve the above-mentioned problems, a photovoltaic power generator according to the present invention is provided with a higher-level control device for centralized control provided in a sales office, a power plant or the like of a power company. A plurality of lower-level control devices to which control information is individually given from the higher-level control device, and one or more distributed power sources provided for each of the lower-level control devices, each of which converts the DC power of the solar cell into AC power by an inverter. A plurality of solar cell power supplies for converting and supplying power to the load of the system are provided, and each lower-level control device controls the operation of the inverter of each solar cell power supply according to the given control information.

Therefore, each lower-level control device forms a control device for each fixed area such as a village or a town, or for each large-scale factory or building. In accordance with the respective control information provided from the higher-level control device provided in the above-mentioned or the like, the operation of the inverter of each solar cell power supply is controlled for each of these areas.

In this case, each solar cell power supply is centrally controlled by a higher-level control device via each lower-level control device. With this centralized control, for example, all solar cell power supplies are stopped when performing a system construction or the like. Power can be cut off in the construction section.

Further, based on individual control information given to each lower-level control device, the operation of the inverter of each solar cell power supply is collectively controlled by the higher-level control device in accordance with the state of the system load, accident power failure and the like. In this case, the control can be performed in units of lower or lower control devices, and appropriate reactive power compensation and power failure compensation can be performed.

Therefore, each of the solar cell power supplies can be most conveniently controlled by a higher-level control device via each lower-level control device in terms of system management and the like.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows, for example, a plurality of solar cell power supplies 1 as a distributed power supply and a child main controller as a lower-level control device that controls these collectively for each of certain areas # 1,. 2 shows a case where a parent main controller 3 as a higher-level control device is provided in a sales office or a power plant of a power company.

Each of the solar cell power supplies 1 has a function of interconnected operation and independent operation, and converts the DC power of the solar cell 4 provided on the roof of a building such as a factory, a building or a house into an inverter 5.
The AC power is supplied to the load 7 of each building via the interconnection switch 6.

These loads 7 are connected to respective sections of the system 10 divided by the division switch 11 via the disconnection switch 8 and the transformer 9, and are disconnected when the respective solar cell power supplies 1 are connected to each other. System power is supplied simultaneously via the switch 8.

The inverter 5 of each solar cell power supply 1 has an IG
An inverter unit including a bridge circuit of a semiconductor element such as a BT, and a driving unit that drives the inverter unit;
The child main controllers 2 of the respective regions # 1 to #N operate collectively in units of the regions # 1 to #N.

That is, the child main controllers 2 of the respective regions # 1 to #N each comprising a microcomputer or the like execute respective operation control programs, and set the operation mode setting signals and timings of the inverters 5 of the respective regions # 1 to #N. A driving signal such as a signal is formed.

[0023] Then, the region # 1 these signals from the transducer 12 _T for transmission of the modem 12 of the slave controller side
To #N are supplied as down signals to the respective inverters 5 via the receiving converters 13 _R of the modem 13 on the distributed power source side provided in the respective solar cell power sources 1 to #N. Control is performed collectively in units of # 1 to #N.

Further, the operation of the inverter 5 by the child main controllers 2 in each of the regions # 1 to #N is centrally managed and controlled by the parent main controller 3 such as a sales office or power plant of an upstream power company. The parent main controller 3 including a microcomputer executes a centralized control program.

The operator's operation command and system 1
0 and the contact information of the switchgear 11 and each area # 1
Based on the status monitoring information such as the #N system voltage, the parent main controller 3 forms a signal of control information for each of the child main controllers 2 in each of the regions # 1 to #N, and transmits a signal of each control device to the parent controller. Converter 14 _T for transmission of modem 14
To the child controller-side modems 12 of each region # 1 to #N
Giving individually to each child main controller 2 via the converter 12 _R for the reception.

The signals of the individual control information include an operation mode switching command and a phase leading operation command. When a power failure (work power failure) occurs in the system 10, an operation stop command is issued at the same time. In the event of a power outage, commands are separately issued for switching from interconnected operation to independent operation or operation stop according to the location of the accident, etc., and when the system voltage in each region # 1 to #N rises according to the load condition, The phase-advance operation is individually commanded according to the system voltages of the regions # 1 to #N.

Each child main controller 2 operates in accordance with the command of the given control information, and forms the operation mode setting signal and the drive signal in accordance with the content of the command.

Therefore, when constructing the system 10, etc.,
Main controller 3 to each child main controller 2
At the same time, the operation of the inverters 5 of all the photovoltaic power supplies 1 in the respective areas # 1 to #N is stopped by the child main controllers 2, and the circuit breakers of the power plants and the like are opened to open the system power supply. Even if the power supply disappears, the inverter 5 of each solar cell power supply 1 does not operate independently, and the construction section of the system 10 is reliably powered down, and the safety of the construction is ensured.

For example, when the system voltage in the area # 1 abnormally rises due to a load condition or the like during the interconnection operation, as shown in FIG. 2, the parent main controller 3 sends the signal to the child main controller 2 in the area # 1. Only the signal of the control information of the leading phase operation command is given, the inverter 5 of each solar cell power supply 1 in this region # 1 is operated in the leading phase, the reactive power is compensated by injecting the AC power, and the system voltage rises. Is suppressed.

In FIG. 2, reference numeral 15 denotes a system power supply, and reference numeral 16 denotes a circuit breaker of a power plant or the like. Furthermore, an accidental power failure occurs in the system 10, and the respective section switches 11 are opened, and the respective areas # 1 to #N
When the power supply goes out of service, each region # 1 to #
When the operation of the inverters 5 of all the solar cell power supplies 1 is uniformly stopped by instructing the child main controller 2 of N to stop the operation, the solar cells are also supplied to the respective loads 7 in the area to which power is supplied from a healthy section other than the accident section. Power failure compensation cannot be performed by the independent operation output of the power supply 1.

Then, the system 10 is out of service due to an accident. At this time, for example, as shown in FIG.
If the system power supply point is located in the accident section, the parent main controller 3 specifies the accident section based on the state monitoring information of the system 10 or the like, and automatically or manually operates the area #.
The self-sustaining operation is commanded to the child main controllers 2 of # 1 and # 2, and the operation stop is commanded to the child main controllers 2 of region # 3.

On the basis of these commands, the main controllers 2 of the areas # 1 and # 2 immediately set the respective areas # 1 and # 2.
Independently operates the inverter 5 of each of the solar cell power supplies 1 and 2 and supplies the independent operation output of each of the solar cell power supplies 1 to the loads 7 in the areas # 1 and # 2.

Further, the child main controller 2 of the area # 3
Stops the operation of the inverter 3 of each solar cell power supply 1 in the area # 3 in order to prevent erroneous charging or the like in the accident section of the system 10 due to independent operation.

Therefore, when a power failure or the like of the system 10 occurs, an appropriate operation mode or the like of each of the regions # 1 to #N is individually commanded to the child main controllers of each of the regions # 1 to #N. Each of the solar cell power supplies 1 of # 1 to #N can be operated in an appropriate mode for each of the regions # 1 to #N to reduce damage caused by a power failure.

Then, the parent main controller 3 (upper control device) provided at the sales office or power plant of the electric power company supplies the lower control devices via the child main controllers 2 of the respective regions # 1 to #N. Since the operation of the inverters 5 of the respective solar cell power supplies 1 is centrally controlled, the respective solar cell power supplies can be most conveniently controlled from the viewpoint of system management and the like by coordinating the child main controllers 2.

Incidentally, the inverter 5 of each solar cell power supply
A so-called state signal such as start / stop and power generation is transmitted from each inverter 5 to the modem 13 as a signal of operation monitoring information.
Are transmitted to the child main controllers 2 of each of the regions # 1 to #N via the transmission converter 13 _{T of the above-mentioned} and the reception converter 12 _R of the modem 12.

Furthermore, state signals of the solar battery power supply 1 for each region #. 1 to # N each child main controller 2 is received by the conversion from the transducer 12 _T for transmission modem 12 for reception of the modem 14 It is sent to the parent main controller 3 through the vessel 14 _R.

Therefore, in this embodiment, the power generation amount and the like in each of the areas # 1 to #N can be centrally monitored by the parent main controller 3.

Then, the modems 12 in each of the regions # 1 to #N,
A communication system between the modem 13 and the modems 12 and 14 includes a wired communication system using a dedicated electric signal cable and an optical signal cable, a distribution line transport system using a distribution line (power line) such as the system 10, a spread spectrum communication system. Alternatively, various methods such as a wireless communication method may be used.

The parent main controller 3 may have at least a function of individually giving control information signals to each child main controller 2.
Are the respective regions # 1 to # 3 according to the received control information.
It is only necessary to have a function of controlling the operation of the inverter 5 of each solar cell power supply 1 of #N, and the configuration of those control programs may be any.

The present invention can, of course, be similarly applied to a case where each child main controller 2 is provided for each large-scale factory or building, and the parent main controller 3 is a power company. May be provided in places other than the business offices.

[0042]

The present invention has the following effects. Each lower-level control device (child main controller 2) forms a control device for each fixed area such as a village or a town or for each large-scale factory or building. The operation of the inverter 5 of each solar cell power supply 1 for each region or the like can be controlled in accordance with each control information provided from a higher-level control device (parent main controller 3) provided at a place or the like.

In this case, each solar cell power supply 1 is centrally controlled by a higher-level control device via each lower-level control device. With this centralized control, all solar cell power supplies 1 Can be stopped to ensure power outage in the construction section.

Also, based on individual control information given to each lower-level control device, the inverter 5 of each solar cell power supply 1
Operation can be controlled collectively or in units of lower-level control devices by the higher-level control device according to the state of the load 7 or the state of a system power outage, etc. Reactive power compensation and power failure compensation can be performed.

Therefore, each of the solar cell power supplies 1 can be most conveniently controlled by a higher-level control apparatus via each lower-level control apparatus in terms of system management and the like. 1 has a remarkable effect when applied to a large-scale photovoltaic power generation device constructed according to 1.

[Brief description of the drawings]

FIG. 1 is a connection diagram of one embodiment of the present invention.

FIG. 2 is a connection diagram illustrating an example of the control of FIG. 1;

FIG. 3 is a connection diagram illustrating another example of the control of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 solar cell power supply 2 child main controller as lower-level control device 3 parent main controller as upper-level control device 4 solar cell 5 inverter 7 load 10 systems

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norio Sakae 47, Takaunecho Umezu, Ukyo-ku, Kyoto

Claims (1)

[Claims] An upper-level control device for centralized control provided at a sales office, a power plant, or the like of a power company; a plurality of lower-level control devices to which control information is individually given from the higher-level control device; One or more distributed power supplies are provided for each of the lower-level control devices, and a plurality of solar cell power supplies are provided, each of which converts DC power of the solar cell into AC power by an inverter and supplies power to a system load. A photovoltaic power generator, wherein a control device controls operation of the inverter of each of the solar cell power supplies according to the provided control information.