KR101443027B1 - System and method for controlling distributed power source - Google Patents

Abstract

The distributed power supply control system and method according to the present invention sets a corresponding PCS to a master PCS as a specific power supply starts to operate among a plurality of distributed power supplies and sets a corresponding PCS to a slave PCS And controlling the operation of the slave PCS to supply power to the slave PCS and the slave PCS, so that the power supply of all the PCSs can be automatically controlled according to the control operation of the specific PCS.

Description

[0001] The present invention relates to a distributed power control system,

[0001] The present invention relates to a technique for supplying power, and more particularly, to a distributed power supply (hereinafter referred to as " distributed power supply ") in which power is supplied from a plurality of distributed power sources to a PCS Control system and method.

Interest in new and renewable energy is increasing due to the finite nature of fossil energy and the environmental pollution problems associated with its use.

These new and renewable energy sources include solar energy, bioenergy that transforms bio resources, wind power, hydro power, fuel cell, liquefied / gasified energy of coal, gasified gas of heavy residue, marine energy, waste energy, geothermal energy , And hydrogen energy.

New and Renewable Energy Development means the production of electricity by using these new and renewable energy, diversification of energy support through activation of the new and renewable industries, stable supply of energy, and environmental conservation Can be achieved.

These new and renewable energy generation is difficult to maintain the power generation over a long period of time, and it is important to secure power that can be practically used by combining multiple power generation sources.

For example, in the case of a solar cell, a solar cell is connected in series to form a string. The solar cell string is provided with a power conditioning system (PCS) and functions as a power source.

However, when a plurality of solar cell strings are connected in parallel for high output, the power supply efficiency is lowered compared to the case of supplying power using a single PCS. Accordingly, a separate PCS for controlling the power supply according to the output of each power source is required, and a scheme for efficiently operating these PCSs is required.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a distributed power control system and method capable of supplying power to a load or a system by controlling a specific PCS among a plurality of PCSs supplying power corresponding to a distributed power source, .

According to an aspect of the present invention, there is provided a distributed power supply control system comprising: a plurality of distributed power sources, each of which is connected to a power source, And a slave PCS that receives power under the control of the master PCS and supplies power corresponding to another power source that starts operation relatively late among the plurality of distributed power sources.

In the distributed power supply control system according to the present invention, the master PCS may control the slave PCS to supply power to the load, the slave PCS to control power supply to the system, or the slave PCS to shut off the power supply And a control unit.

In the distributed power control system according to the present invention, the master PCS calculates the amount of power to be supplied by each of the master PCS and the slave PCS, and calculates the amount of power to be supplied by the slave PCS to the slave PCS according to the calculated result And the master PCS and the slave PCS supply power in accordance with the calculated result.

In the distributed power supply control system according to the present invention, the slave PCS directly supplies power according to the amount of power received from the master PCS.

In the distributed power control system according to the present invention, the master PCS receives power from the slave PCS according to the calculated result, and supplies power of the specific power source and power received from the slave PCS .

In the distributed power supply control system according to the present invention, the master PCS inverts the power received from the slave PCS from AC to AC.

According to another aspect of the present invention, there is provided a distributed power control method comprising: a master setting step of setting a corresponding PCS as a master PCS as a specific power source starts operating among a plurality of distributed power sources; A slave setting step of setting a corresponding PCS as a slave PCS as the power supply starts to operate, and a control step of supplying power to the slave PCS by controlling the operation of the slave PCS by the master PCS .

In the distributed power supply control method according to the present invention, the master PCS of the control step controls the slave PCS to supply power to the load, or controls the slave PCS to supply power to the system, And controls to cut off the power supply.

In the distributed power supply control method according to the present invention, the controlling step may include a step in which the master PCS calculates an amount of power to be supplied by each of the master PCS and the slave PCS, , The master PCS and the slave PCS supplying power in accordance with the calculated result.

In the distributed power supply control method according to the present invention, the step of supplying power supplies power to the slave PCS directly or in accordance with the power amount information received from the master PCS.

In the distributed power supply control method according to the present invention, the step of supplying power may include receiving power from the slave PCS according to the calculated result, receiving power from the slave PCS, And power is supplied to the system.

In the distributed power supply control method according to the present invention, the step of supplying the power may include supplying the power received from the slave PCS by the master PCS by inverting from the DC to the AC.

In the distributed power supply control method according to the present invention, the method further includes setting a specific slave PCS among the plurality of slave PCSs as a new master PCS.

In the distributed power control method according to the present invention, the new master PCS is provided with information of other slave PCS recognized from the existing master PCS.

In order to achieve the above object, the present invention provides a computer-readable recording medium storing a program for executing the control method.

According to the distributed power control system and method according to the present invention, a specific PCS among the PCSs corresponding to the distributed power sources can function as a master for controlling other PCSs, so that the power supply of all the PCSs can be automatically controlled.

Further, it is easy to add or remove a separate power system, and adaptive power supply is possible in various situations such as power generation status, power supply status, function abnormality, and operation stop.

1 is a configuration diagram of a distributed power control system according to an embodiment of the present invention.
2 is a configuration diagram of a distributed power control system according to another embodiment of the present invention.
3 is a flowchart of a distributed power control method according to an embodiment of the present invention.

In the following description, only parts necessary for understanding the embodiments of the present invention will be described, and the description of other parts will be omitted so as not to obscure the gist of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor is not limited to the meaning of the terms in order to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

The present invention relates to a system and method for allowing a specific PCS (Power Conditioning System) to control operation of another PCS to supply power in a process of supplying power using a plurality of distributed power sources. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram of a distributed power control system 100 according to an embodiment of the present invention.

Referring to FIG. 1, the distributed power control system 100 of the present embodiment includes a plurality of distributed power sources 1, 2, and 3 and corresponding PCSs 10, 20, and 30.

At this time, the slave PCS 10 is provided corresponding to the power source 1, the master PCS 20 is provided corresponding to the power source 2, and the slave PCS 30 is provided corresponding to the power source 3.

The power supplied from the distributed power control system 100 may be delivered to the load independently, for example, without a commercial power source, where each PCS 10, 20, 30 can manage a power storage device such as a battery Charge / discharge controller (charge controller).

Also, the power supplied from the distributed power control system 100 can be supplied, for example, in such a manner that the output of the distributed power control system 100 is linked to the system. In this case, the distributed power control system 100 can supply only the remaining power supplied to the load to the grid, subtract the electricity charge corresponding to the surplus power through the reverse rotation of the integrated power meter, or supply the power supplied to the grid The user can benefit as much as the electricity bill according to the user.

The power sources 1, 2, and 3 are used for converting solar energy, bio-energy used for converting biomass, wind power, hydro power, fuel cell, energy liquefied / gasified in coal, gasified heavy gas, It can be a power generator that generates electric power by using geothermal energy or hydrogen energy.

The PCS 10, 20, and 30 are devices that can convert DC power generated from the power sources 1, 2, and 3 into AC power. When connected to the system, the PCS 10, 20, It is possible to perform a function of converting to AC power.

The PCS 10, 20 and 30 according to the present invention can perform the function of boost conversion of DC power generated from the power sources 1, 2 and 3 to DC power. At this time, the outputs of the power sources 1, 2 and 3 MPPT (Maximum Power Point Tracking) function for controlling the power to be generated at the maximum power point, and various protection functions for minimizing an electric shock or a system accident can be provided.

Generally, the power generation voltage of the power source changes every moment, and when the PCS is provided in each power source, it is advantageous in terms of expanding the power source. However, if there is a problem with a specific power source, it can be switched to a islanded operation mode where power is supplied alone. In this case, the size of the active power produced by the distributed power source and the size of the load Therefore, there is a limitation that stable power supply is difficult, and if the power supply is not cut off at the time of system restoration work, the risk of a safety accident increases.

Also, when each power source is connected in parallel and controlled by a single PCS, a voltage unbalance problem arises due to the parallel connection, and MPPT is uniformly applied to all the power sources, so that optimal MPPT control is not performed .

In this embodiment, the PCSs 10, 20 and 30 are respectively provided in the power sources 1, 2 and 3, and the specific PCS 20 becomes the master PCS 20 to control the other PCSs 10 and 30 , And a distributed power control system that can supply power through it.

In the present invention, the corresponding PCS 20 is set to the master PCS 20 as the power source 2 starts operating. At this time, when the power source 2 starts to operate, it means that the power source 2 and the PCS 20 are installed as a single power source, and that the power source 2 is firstly switched from the operation stop state or the malfunction state to the operation state .

The setting of the master PCS 20 is realized by the PCS 20 recognizing that the PCSs 10 and 30 corresponding to the other power sources 1 and 3 are not operating by transmitting and receiving information using the communication module, And the PCS 20 is set to the master PCS 20 via the equipment.

The master PCS 20 refers to the PCS 20 capable of controlling the other slave PCSs 10 and 30. The master PCS 20 inverts the DC power generated from the power source 2 with AC power It transfers to department and system. In addition, the master PCS 20 can perform a booster converter function for converting DC power into DC power, and can efficiently generate power through an MPPT algorithm using, for example, P & O (perturbation and observation).

Thereafter, as the power sources 1 and 3 start to operate, the corresponding PCSs 10 and 30 are set to the slave PCSs 10 and 30. The fact that the power sources 1 and 3 start operation relatively later than the power source 2 means that the power sources 1 and 3 and the PCSs 10 and 30 May indicate that the power source 1 or 3 is in the operating state after the power source 2 has been shut down or changed from the malfunctioning state to the operating state.

At this time, the slave PCSs 10 and 30 refer to the PCSs 10 and 30 under the control of the master PCS 20. At this time, the slave PCSs 10 and 30 are connected to the other power source 2 Recognizes that the corresponding PCS 20 is operating first, and can request registration of the slave PCS 10, 30 to the master PCS 20. Also, the slave PCS 10, 30 may be set as a slave PCS 10, 30 from a separate control device.

At this time, the slave PCS (10, 30) can perform a booster converter function between DC power and DC power by utilizing the MPPT algorithm, or perform an inverter function to convert DC power into AC power.

In this case, the master PCS 20 controls the slave PCS 10, 30 to supply power to the load, or controls the slave PCS 10, 30 to supply power to the system, or controls the slave PCS 10, A power supply is cut off, and the like. Such a control operation may be performed through information transmission / reception through a wired or wireless communication module.

The master PCS 20 of the present embodiment can calculate the amount of power to be supplied by the master PCS 20 itself and the amount of power supplied by each of the slave PCSs 10 and 30 Calculate the amount of power. Then, the master PCS 20 transmits information on the amount of power to be supplied by the slave PCS 10, 30 to the slave PCS 10, 30 according to the calculation result.

The slave PCS 10, 30, which has received the power amount information from the master PCS 20, supplies power to the load or the system in accordance with the information. In this manner, in this embodiment, the master PCS 20 is connected to the slave PCS 10, and 30 to supply electric power.

In the present embodiment, the PCS 20 is set as the master PCS 20 and controls the other slave PCSs 10 and 30. However, according to the embodiment, as the power sources 1 and 3 start to operate first, One of the PCS 10 and 30 may be set as a master, and another PCS may be operated as a slave.

In this way, in the present invention, any one of the PCS 10, 20, and 30 can be prevented from operating alone, and the entire power supply system can be controlled without adding a separate PCS.

In one embodiment of the present invention, if the master PCS 20 no longer needs to act as a master, one of the other PCS 10, 30 may be set as the master PCS to allow the control operation to be performed.

For example, when a malfunction occurs in the power source 2 or there is no power generation, the master PCS 20 can inform the other PCS 10, 30 or a separate control device through the communication module. When there is a priority to be a master in the PCS 10 because the PCS 10 starts operating relatively first among the remaining PCSs 10 and 30 or the like, the PCS 10 receives information transmitted from the PCS 20 Or may be set to the master PCS 10 by receiving setting information from a separate control device. At this time, the existing master PCS 20 can provide the information of the other slave PCS 30 previously recognized by the new master PCS 10 so that the new master PCS 10 performs the control operation.

Thereafter, the PCS 10, which is set as the master, controls the slave PCS 30 through the above operation to supply power to the load or the system.

The distributed power control system 200 for supplying power to a load or a grid according to another embodiment of the present invention will be described in detail with reference to FIG.

2 is a configuration diagram of a distributed power control system 200 according to another embodiment of the present invention.

2, the distributed power control system 200 of the present embodiment includes a plurality of distributed power sources 1, 2 and 3 and corresponding PCSs 10, 20 and 30, A master PCS 20 is provided corresponding to the power source 2 and a slave PCS 30 is provided corresponding to the power source 3. The slave PCS 10,

The functions and operations of the respective components of the distributed power control system 200 are similar to those described with reference to FIG. 1, and therefore, differences will be mainly described below.

In this embodiment, the PCSs 10, 20 and 30 are provided in the power sources 1, 2 and 3, respectively, and the specific PCS 20 becomes the master PCS 20 to control the other PCS 10 and 30, Thereby supplying power.

At this time, the corresponding PCS 20 is set to the master PCS 20 as the power source 2 starts its operation. The setting of the master PCS 20 is realized by the PCS 20 recognizing that the PCSs 10 and 30 corresponding to the other power sources 1 and 3 are not operating by transmitting and receiving information using the communication module, To the master PCS (20).

The master PCS 20 refers to the PCS 20 capable of controlling the other PCS 20. The PCS 20 inverts the DC power generated from the power source 2 with AC power and transfers the DC power to the loader and the system. In addition, the master PCS 20 can perform a booster converter function for converting DC power into DC power, and can efficiently generate electric power through the MPPT algorithm using P & O, for example.

Thereafter, the corresponding PCS 10, 30 is set to the slave PCS 10, 30 as the power source 1, 3 starts operation. In this case, the slave PCS 10, 30 means the PCS 10, 30 under the control of the master PCS 20, and the master PCS 20 corresponding to the other power source 2, The slave PCS 10 or 30 is requested to register the slave PCS 10 or 30 from the master PCS 20 or from the separate control device to the slave PCS 10 or 30, It can be the slave PCS 10, 30 which receives the control.

At this time, the slave PCS (10, 30) can perform a booster converter function between DC power and DC power using the MPPT algorithm.

The master PCS 20 of the present embodiment can calculate the amount of power to be supplied by the master PCS 20 itself and the amount of power supplied by each of the slave PCSs 10 and 30 Calculate the amount of power. Then, the master PCS 20 transmits information on the amount of power to be supplied by the slave PCS 10, 30 to the slave PCS 10, 30 according to the calculation result.

The slave PCSs 10 and 30 that have received the power amount information from the master PCS 20 transmit the DC power generated by the power sources 1 and 3 to the master PCS 20 in accordance with the power amount information received from the master PCS 20 .

The master PCS 20 receiving the power from the slave PCS 10 and 30 receives the DC power generated by the power source 1 and the DC power received from the slave PCS 10 and 30 by inverting the AC power And supplies it to the system. If it is connected to the system, the master PCS 20 can convert the AC power into a less harmonic AC power while synchronizing with the system.

In the embodiment of the present invention, when it is no longer necessary for the PCS 20 to operate as a master, such as a malfunction in the power source 2 or the master PCS 20 or a lack of power generation of the power source 2, One of the PCS 10 and 30 may be set as the master PCS so that the control operation can be performed. In this case, the PCS 10 or the PCS 30 can be set as the master PCS according to the setting using the communication between the existing master PCS 20 and the new master PCS or the setting via the separate control device, PCS can be controlled by the master PCS. At this time, the existing master PCS 20 can provide the information of the other slave PCS recognized as the new master PCS so that the new master PCS performs the control operation.

A process of supplying power to a load or a system according to an embodiment of the present invention will be described in detail with reference to FIG.

3 is a flowchart of a distributed power control method according to an embodiment of the present invention.

Referring to FIG. 3, as the specific power source among the plurality of distributed power sources starts operating, the corresponding PCS is set to the master PCS (S1).

In step S1, the master PCS means a PCS that can control the power supply situation by controlling other PCSs. At this time, when the specific power source starts to operate, it means that the specific power source and the corresponding PCS are installed before the other power source and the PCS as a single power source, and when the specific power source is operated before the other power source, It may mean that it has been switched to the operating state.

In step S1, for example, the master PCS 20 recognizes through the information exchange using the communication module that the PCS corresponding to the other power source is not operating, or communicates with another control device Can be set as the master PCS.

Thereafter, as the other power source starts operating, the corresponding other PCS is set as the slave PCS (S2).

In step S2, the slave PCS is a PCS that receives power under the control of the master PCS and supplies power to the system. Also, the fact that the other power source starts operating relatively later than the specific power source may mean that the power source and the PCS are installed after the installation of the specific power source and the PCS as the power source, It may mean that the other power source is in operation after being switched to the operating state.

In step S2, for example, the slave PCS recognizes that the master PCS corresponding to the specific power source is operating first through information exchange using the communication module, requests registration of the slave PCS, As shown in FIG.

After the master PCS is set in step S1 and the slave PCS is set in step S2, the master PCS controls the slave PCS so that power is supplied to the slave PCS (step S4).

The master PCS in step S3 calculates the amount of power to be supplied by the master PCS itself and the amount of power to be supplied by the slave PCS due to the generation of another power source and the amount of power to be supplied by the slave PCS To the slave PCS. Thereafter, the master PCS and the slave PCS in step S4 supply power according to the calculation result, so that the master PCS can control the slave PCS.

In one embodiment of the present invention, the master PCS and the slave PCS of step S4 can boost-convert DC power to DC power according to the power generation of the corresponding power source, and use the MPPT algorithm such as P & O. The master PCS and the slave PCS can directly supply power to the load and the system by inverting the DC power to the AC power.

In another embodiment of the present invention, the master PCS and the slave PCS of step S4 can perform the boost conversion of the DC power of the corresponding power source to the DC power using the MPPT algorithm such as P & At this time, the slave PCS transfers the converted DC power to the master PCS, and the master PCS converts the DC power generated from the corresponding power source and the DC power received from the slave PCS into AC power and supplies the AC power to the load and the system.

Thereafter, when a malfunction occurs in the master PCS set in step S1, or when a corresponding specific power source stops operating, a specific PCS is set as a master PCS in the existing slave PCS (S5).

In step S5, for example, the existing master PCS can inform the other PCS or another control device of the occurrence of an operation stop or a function abnormality through information exchange using the communication module. Also, a specific PCS among the existing slave PCS may be set as a new master PCS by receiving information transmitted from an existing master PCS or receiving setting information from a separate control device. At this time, the existing master PCS can provide the information of the other slave PCS recognized as the new master PCS so that the new master PCS performs the control operation.

Thereafter, the new master PCS controls another slave PCS to supply power to the load or the system (S6).

The distributed power control method according to an embodiment of the present invention may be implemented in a form of a program readable by various computer means and recorded in a computer-readable recording medium.

It should be noted that the embodiments disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein. Furthermore, although specific terms are used in this specification and the drawings, they are used in a generic sense only to facilitate the description of the invention and to facilitate understanding of the invention, and are not intended to limit the scope of the invention.

1, 2, 3: Power supply
10, 20, 30: PCS

Claims (15)

A master PCS for supplying electric power to one or a plurality of distributed power supplies corresponding to a specific power source which has first started to operate and controlling the operation of another power conditioning system (PCS); And
A slave PCS which is controlled by the master PCS and supplies electric power corresponding to another power source which starts relatively late among the plurality of distributed power sources;
Lt; / RTI >
The master PCS calculates the amount of power to be supplied by each of the master PCS and the slave PCS and transmits the amount of power to be supplied by the slave PCS to the slave PCS according to the calculated result,
Wherein the master PCS and the slave PCS supply power according to the calculated result. The method according to claim 1,
The master PCS,
Wherein the slave PCS controls the slave PCS to supply electric power to the load or controls the slave PCS to supply electric power to the syste or the slave PCS to interrupt the electric power supply. delete The method according to claim 1,
Wherein the slave PCS directly supplies power according to the amount of power received from the master PCS. The method according to claim 1,
Wherein the master PCS receives power from the slave PCS according to the calculated result, and supplies power of the specific power source and power received from the slave PCS. 6. The method of claim 5,
Wherein the master PCS inverts the power received from the slave PCS by inverting the power from the DC to the AC. A master setting step of setting a corresponding PCS to a master PCS as a specific power among a plurality of distributed power sources starts operation;
A slave setting step of setting a corresponding PCS as a slave PCS when another power among the plurality of distributed power sources starts to operate; And
A control step of the master PCS controlling operation of the slave PCS and supplying power to the slave PCS;
Lt; / RTI >
Wherein the control step comprises:
Calculating, by the master PCS, an amount of power each of the master PCS and the slave PCS to supply;
Transmitting, by the master PCS, the power amount information to be supplied by the slave PCS to the slave PCS according to the calculated result;
The master PCS and the slave PCS supplying power according to the calculated result;
And a control unit for controlling the distributed power supply. 8. The method of claim 7,
The master PCS of the control step,
Wherein the slave PCS controls the slave PCS to supply power to the load or controls the slave PCS to supply electric power to the syste or the slave PCS to stop the electric power supply. delete 8. The method of claim 7,
Wherein the step of supplying power comprises:
Wherein the slave PCS directly supplies power to the slave PCS according to the power amount information received from the master PCS. 8. The method of claim 7,
Wherein the step of supplying power comprises:
Wherein the master PCS receives power from the slave PCS according to the calculated result, and supplies the power of the specific power and the power received from the slave PCS to the subsystem or the system. 12. The method of claim 11,
Wherein the step of supplying power comprises:
Wherein the master PCS inverts the power received from the slave PCS from the DC to the AC and supplies the power. 8. The method of claim 7,
Setting a specific slave PCS among the plurality of slave PCSs as a new master PCS;
Further comprising the steps of: 14. The method of claim 13,
Wherein the new master PCS is provided with information of another slave PCS recognized from the existing master PCS. A computer-readable recording medium having recorded thereon a program for executing the control method according to any one of claims 7, 8 and 10 to 14.

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