WO2012067368A2 - Procédé et dispositif de conversion de puissance mettant en oeuvre un dispositif de charge et doté d'une fonction de régulation de la puissance réactive - Google Patents

Procédé et dispositif de conversion de puissance mettant en oeuvre un dispositif de charge et doté d'une fonction de régulation de la puissance réactive Download PDF

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Publication number
WO2012067368A2
WO2012067368A2 PCT/KR2011/008391 KR2011008391W WO2012067368A2 WO 2012067368 A2 WO2012067368 A2 WO 2012067368A2 KR 2011008391 W KR2011008391 W KR 2011008391W WO 2012067368 A2 WO2012067368 A2 WO 2012067368A2
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Prior art keywords
power
reactive
grid
power supply
current
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PCT/KR2011/008391
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English (en)
Korean (ko)
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WO2012067368A3 (fr
Inventor
엄주경
최기수
배정환
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(주)인텍에프에이
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Priority claimed from KR1020110015603A external-priority patent/KR101135284B1/ko
Application filed by (주)인텍에프에이 filed Critical (주)인텍에프에이
Priority to US13/885,484 priority Critical patent/US20130234521A1/en
Publication of WO2012067368A2 publication Critical patent/WO2012067368A2/fr
Publication of WO2012067368A3 publication Critical patent/WO2012067368A3/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Definitions

  • the present invention relates to a renewable energy source and a distributed power source capable of temporarily storing power from the energy source and a power conversion system for stabilizing the power system through such a system.
  • Renewable energy sources can be connected to the power system to efficiently use the power generated from the main power source, which is the main power source.
  • a charging device such as a battery is required to properly convert power in consideration of the state of the load side.
  • the reactive power compensation is not properly performed, thereby increasing the instability of the power system. . Therefore, there is a need for an apparatus and a system capable of efficiently managing a power system operated by a main power supply or a main power supply by compensating reactive power when supplying renewable energy to a power system.
  • the power converter including a reactive power control function for solving the above problems is an alternative power input unit receiving alternative power from at least one auxiliary power supply; A power conversion switching unit converting electricity input from the alternative power input unit into alternating current; A charging power supply unit connected to the alternative power input unit and storing electricity supplied from the alternative power input unit or from a grid through the power conversion switching unit; And receiving power factor, active power, and reactive power requirements from the grid connected to the consumption load through communication, and outputting voltage and current output through the power conversion switching unit to meet power factor information, active power, and reactive power requirements received from the grid. Characterized in that it comprises a power control unit for controlling the.
  • a power conversion method including a reactive power control function, comprising: receiving, by a power controller, power factor information, active power, and reactive power requirements from a grid connected to a consumption load; Applying, by the power control unit, a voltage command to be produced in the power conversion switching unit, a current command, and a power factor command to cause a difference between voltage and current according to the power factor information, the active power, and the reactive power requirements; And supplying a voltage and a current to the consumption load from at least one power supply device of at least one auxiliary power supply device and a charging power supply device based on the voltage command, current command, and power factor command. It is done.
  • the power conversion system it is possible to stably maintain the power supply of the power system through alternative power sources such as various renewable energies, and input information of active power and reactive power of the power supply grid and consumer demand. It is possible to efficiently operate the power of the power system by compensating reactive power as well as reactive power.
  • FIG. 1 shows an overall system diagram employing a multi-function power converter in accordance with the present invention.
  • Figure 2 shows a power conversion system diagram capable of one-phase to three-phase conversion in accordance with an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating a stand-by state of a system for performing power conversion when power is supplied via a renewable energy supply power according to an embodiment of the present invention.
  • 4A is a diagram illustrating an example of an operation of a system that performs power conversion when power is supplied through a renewable energy supply power source according to an embodiment of the present invention.
  • 4B is a diagram illustrating another example of an operation of a system for performing power conversion when power is supplied through a renewable energy supply power source according to an embodiment of the present invention.
  • 4C is a diagram illustrating another example of an operation of a system for performing power conversion when power is supplied through a renewable energy supply power source according to an embodiment of the present invention.
  • 5A is a diagram illustrating an example of an operation of a system that performs power conversion together with battery charging when power is supplied through a renewable energy supply power source according to an embodiment of the present invention.
  • 5B illustrates another example of an operation of a system that performs power conversion together with battery charging when power is supplied through a renewable energy supply power according to an embodiment of the present invention.
  • FIG. 5C is a diagram illustrating another example of an operation of a system that performs power conversion together with battery charging when power is supplied through a renewable energy supply power according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating an example of an operation of a system that performs power conversion when power is supplied through a battery according to an embodiment of the present invention.
  • FIG. 7 illustrates an example of an operation of a system for performing power conversion when supplying renewable energy and power through a battery according to an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating an example of an operation of a system for performing power conversion for charging a battery with surplus energy coming from a grid side according to an embodiment of the present invention.
  • 9A is a diagram illustrating an example of an operation of a system for controlling reactive power of a power system based on power factor information on a grid and a consumption load side according to an embodiment of the present invention.
  • 9B is a diagram illustrating reactive power control through a power converter according to a power factor of a load side according to one embodiment of the present invention.
  • 9C shows a block diagram of a current controller for controlling reactive power in accordance with one embodiment of the present invention.
  • FIG. 10 is a diagram illustrating an example of a system for controlling reactive power at a load side and an example of a power conversion operation for supplying renewable energy and power from a battery, according to an embodiment of the present invention.
  • FIG. 11 is a diagram illustrating an example of a power conversion operation for supplying power by alternative energy and a battery when a grid is disconnected according to an embodiment of the present invention.
  • FIG. 12 is a block diagram of a power conversion apparatus including a reactive power control function according to an embodiment of the present invention.
  • FIG. 13 is a view illustrating a method of supplying a voltage and a current so that a power system can be stabilized by receiving power factor information, active power, and reactive power requirements from a grid to which a power consumption unit is connected, according to an embodiment of the present invention. It is a flowchart showing.
  • renewable energy sources which are individual alternative energy sources, in addition to the main source of electricity from nuclear power plants, thermal power plants, and hydro power plants.
  • the development of such alternative or renewable energy is a great help in the operation of the power system in terms of sharing the power of the main power supply or the main power supply in one large system.
  • a power system operator has a distributed power source such as a large-capacity battery or a charging device to monitor the state of the load side through communication to use renewable energy supplementally when the power demand of the load is peak, It can bring great stability.
  • the power converter can compensate not only active power at the load side but also reactive power, the stability of the power system becomes higher. This is even more necessary when the power scale of the period power supply that supplies power to the load is small. More specifically, when the power from the mains power source is operated by a small generator such as a diesel generator with a small capacity, only the active power is supplied through the renewable energy when grafting renewable energy to the power system for power assistance. The power system may become unstable. In addition to the case of small-scale power supply as well as the importance of renewable energy, as the importance of renewable energy sources produced by consumers increases, the proportion of power generated by renewable energy increases, and the stabilization of the power system It will be a more important issue.
  • the power system can be operated stably while using the renewable energy sufficiently.
  • renewable energy and alternative energy will be used interchangeably.
  • FIG. 1 shows an overall system diagram employing a multi-function power converter in accordance with the present invention.
  • a wind generator 110, a fuel cell 120, and a solar generator 130 are illustrated as various renewable energy sources.
  • Alternative energy or renewable energy source shown in Figure 1 is shown as an example, but is not limited to the above three. Includes geothermal power, bio, solar, waste, hydro, ocean (tide), hydrogen, animal and plant organics, and conventional thermal power generation.
  • the multi-function power conversion system 100 is included in the system.
  • the multi-function power conversion system 100 is an AC / DC 101 as a converter for converting AC into DC, and also a DC / DC 103 and a DC / DC battery charger 109 as a converter for converting DC into DC of different sizes.
  • a sinusoidal rectifier filter 107 including an inductor that removes harmonic noise to approximate a sine wave with a PWM output voltage output from the DC / AC 105 and an inverter converting direct current into alternating current. It is composed.
  • EMS 160 Electronicgy Management system
  • EMS 160 consumes the load from the control center 170. It receives the status and controls the multi-function power conversion system 100 according to the present invention.
  • EMS 160 may be referred to as a kind of power controller and will be used interchangeably with power controller or power controller in this specification.
  • the EMS 160 and the power control unit according to the present invention may be configured as separate devices.
  • the EMS 160 simply receives information on the grid and the consumption load, for example, power factor information, active power requirement, and reactive power demand from the control center 170, and transmits the power factor to the power control unit so that the power controller receives the power factor.
  • the switching unit of the power converter can be controlled according to information, active power requirements, and reactive power requirements to generate voltages and currents corresponding to the power factor.
  • it plays a role of controlling the magnitude and phase difference of the output voltage and current by performing a d-q conversion required for inverter (or converter) control and a controller such as a PI controller.
  • the battery bank 150 may be charged with energy, a consumption load, or surplus power from the grid 140 generated as a renewable energy source through the battery charger 109.
  • the battery charger 109 may be called a charging device or a charging power supply unit.
  • Figure 2 shows a power conversion system diagram capable of one-phase to three-phase conversion in accordance with an embodiment of the present invention.
  • DC / AC 105 in FIG. 1 is composed of three single-phase DC / AC 1051, 1052, and 1053 devices as shown in FIG. 2, each generating one AC wave and three three-phase DC / AC The devices can finally generate three-phase power by controlling them to be properly 120 degrees apart from each other.
  • FIG. 3 is a diagram illustrating a stand-by state of a system for performing power conversion when power is supplied through alternative energy supply power according to an embodiment of the present invention.
  • the grid 140 such as the main power supply
  • the grid 140 may be referred to as an ordinary power system in which power is supplied to the consumption loads 180 and 190.
  • the multi-function power conversion system 100 according to an embodiment of the present invention is connected to the grid 140 in the power system, but is not operating yet. In the current situation, the grid 140 must be able to preliminarily produce power above the power peak to fill the shortage of active power and reactive power generated in the power system.
  • 4A is a diagram illustrating an example of an operation of a system that performs power conversion when power is supplied through a renewable energy supply power source according to an embodiment of the present invention.
  • the wind generator 110 is in operation, and the alternative energy generated by the wind generator 110 is supplied to the power system through the multi-function power conversion system 100 according to the present invention.
  • the grid 140 may receive the insufficient power from the multi-function power conversion system 100 through the wind generator 110.
  • power is required beyond power supplied by the grid 140 in the power system, and may be referred to as when power generation by wind power is possible.
  • the power supplied from the grid 140 in the entire power system cannot adequately handle the consumption loads 180 and 190, power is supplied from the auxiliary power. If the solar power is not easy depending on the weather conditions and instead the wind is blowing hard, it is a situation to be supplemented with power through the wind generator 110, which is an alternative energy. Therefore, the energy generated from the wind generator 110 is not charged to a (secondary) distributed power source such as the battery bank 150, but acts as a power source of the power system. In this case, the EMS 160 receives power from the power system through communication and operates the DC / AC 105 to supply power generated through the wind generator 110 to the power system.
  • FIG. 4B illustrates an example in which the same operation is performed but the solar generator 130 instead of the wind generator 110 serves as an auxiliary power source as alternative energy.
  • the solar generator 130 instead of the wind generator 110 serves as an auxiliary power source as alternative energy.
  • the energy generated through the solar generator 130 is a DC power source, so no separate AC / DC conversion is required.
  • FIG. 4C is a diagram illustrating another example of an operation of a system for performing power conversion when power is supplied through a renewable energy supply power source according to an embodiment of the present invention.
  • the solar generator 130 also operates while the wind generator 110 operates.
  • the generated renewable energy serves to supplement the power of the grid.
  • the power system becomes unstable if one breaks the ratio of the active power and the reactive power consumed by the consumption load and unilaterally supplies the active power. If the consumption load is always a resistance component, the unilateral active power supply of renewable energy may be helpful to the power system, but there are not many cases where the consumption load is only a resistance component, and there will always be reactive power. Accordingly, the power system becomes unstable unless the voltage and current supplied from the renewable energy reflect the power factor information of the consumption load and do not assist the power supply of the grid without breaking the power factor relationship.
  • the power converter 100 may control the voltage and current to be out of phase through the DC / AC 105 switching control by reflecting the power factor information of the consumption load.
  • FIG. 5A is a diagram illustrating an example of an operation of a system that performs power conversion together with battery charging when power is supplied through an alternative energy supply power source according to an embodiment of the present invention.
  • the battery bank 150 is charged.
  • the power charged in the battery bank 150 may be temporarily stored and may be usefully used when power is not generated by the auxiliary power source later or when the power system is heavily loaded.
  • 5B illustrates another example of an operation of a system that performs power conversion together with battery charging when power is supplied through an alternative energy supply power source according to an embodiment of the present invention. It can be seen that the time for performing the operation according to FIG. 5A is sufficiently long so that a sufficient amount of electrical energy is stored in the battery bank 150.
  • FIG. 5C is a diagram illustrating another example of an operation of a system that performs power conversion together with battery charging when power is supplied through an alternative energy supply power source according to an embodiment of the present invention.
  • the battery bank 150 has already been charged and is no longer charged. Therefore, the electric energy generated from the wind power generator 110 and the solar power generator 130 as auxiliary power bypasses the battery bank 150 as distributed power and is supplied to the consumption loads 180 and 190. If the EMS 160 adjusts the power supply of the grid 140 through communication with the grid 140 side, it will be a great help in power efficiency.
  • the EMS 160 which may be referred to as a power controller, may control the power supply on the battery bank 150 and the auxiliary power and consumption load connections.
  • the switch may be mounted at the output terminal or the auxiliary power connection terminal of the battery bank 150 and controlled by the power controller, and the power output may be controlled through the switching operation of the DC / AC 105.
  • the alternative energy power such as the wind generator 110 and the solar generator 130 is consumed.
  • Switching control can be performed so that active power and reactive power can be supplied while maintaining the power factor at the load.
  • the switch semiconductor various switching semiconductors, which are usually used for power change devices, may be used. Representative examples thereof include IGBT, GTO, and POWER MOSFET.
  • FIG. 6 is a diagram illustrating an example of an operation of a system that performs power conversion when power is supplied through a battery according to an embodiment of the present invention.
  • Power is not currently produced through the wind power generator 110 or the solar generator 130, which is an auxiliary power source. However, through the grid 140, the consumption load (180, 190) of the degree that can not supply enough power to the power system is connected.
  • the EMS 160 receives this power system state by communication, and now operates the pre-charged battery bank 150 to supply power to the power system. Similarly, the power factor, the required active power, and the reactive power are received in advance through the EMS 160 to provide a voltage and current phase difference during DC / AC power conversion of the battery bank 150 to satisfy the required power factor, active power, and reactive power. Switching control is performed.
  • FIG. 7 illustrates an example of an operation of a system for performing power conversion when supplying renewable energy and power through a battery according to an embodiment of the present invention.
  • the power system needs large load loads 180 and 190 to require the power of the wind generator 110, the solar generator 130, and the battery bank 150 in addition to the main power source 140. It is a state.
  • the EMS 160 receives the load state from time to time, and considers whether to continuously supply the power of the battery bank 150 to the power system. If the wind generator 110 and the solar generator 130 consume enough loads 180 and 190, respectively. If it can handle the power supply from the battery bank 150 can be cut off.
  • FIG. 8 is a diagram illustrating an example of an operation of a system for performing power conversion for charging a battery with surplus energy coming from a grid side according to an embodiment of the present invention.
  • the current consumption load (180, 190) request is not very large state.
  • the power supplied from the grid 140 which may be referred to as a term power source, may be referred to as a case where surplus power is generated. For example, when a large amount of power is supplied during the summer day and the surplus power occurs at night, the surplus power is determined by checking the load state of the power system through the EMS 160. Power can be charged to a distributed power source such as battery bank 150. In this case, the switching element (diode) of the AC / DC 105 may act as a rectifier to charge the battery bank 150 with AC power on the grid side.
  • 9A is a diagram illustrating an example of an operation of supplying only reactive power through a power conversion device due to a power factor difference between a main power supply and a consumption load side according to an embodiment of the present invention.
  • the power factor at the current consumption loads 180, 190 is 0.7 and the power factor at the mains supply side is 0.9.
  • the multi-function power conversion system 100 may perform a function of controlling reactive power. For example, when the electric energy stored in the battery bank 150 is converted to AC through the DC / AC 105, but the 90 degree phase difference between the output current and the voltage is converted, only reactive power can be supplied and supplied. By controlling reactive power, the power factor of 0.7 at the load side can be satisfied. One example of this is when only reactive power is supplied to the side where the grid and the consumption load are connected.
  • the main power source 140 typically a KEPCO
  • the consumption load 180 has an equivalent circuit as in (a) including a resistor and an inductor
  • the current ia is the ground current with which the phase difference occurs with respect to the voltage v.
  • the power converter according to the present invention can supply the corresponding active power and the reactive power.
  • the EMS 160 receives power factor information cos ⁇ from the grid and calculates sizes of active power and reactive power to be compensated (controlled). Since the power factor, cos ⁇ , is known to the power converter, the power converter supplies power that can be supplied through the switching denial DC / AC 105, but the active power size is Pa 'and the reactive power size is Pr'.
  • the power converter compensates the power consumption required by the total consumption load to supply the power system, and balances the power factor, thereby preventing the power system from becoming unstable.
  • the power converter can stabilize the power system by producing only reactive power Pr ''.
  • 9C shows a block diagram of a current controller for controlling reactive power in accordance with one embodiment of the present invention.
  • the controller is configured in the form of converting the single-phase current into dq coordinates.
  • iq 913 is the q-axis current of the inverter output current
  • id 923 is the d-axis current of the inverter output current.
  • three-phase current can be converted to d-q current by d-q conversion, often iq is divided into torque current and id is flux current.
  • Eq 950 is a q-axis voltage input from the power system and is dq-converted
  • Ed 960 is a d-axis voltage input from the power system and is dq-converted
  • i q * 910 is the q-axis reference current for the magnitude of the phase angle w
  • i d * 920 is the d-axis reference current for the magnitude of the phase angle w
  • wL 970 is a gain value of the current controller, where w is the phase difference between the output current and the output voltage.
  • the difference between the reference values i q * (910) and i d * 920 and the actual current values i q (911) and i d (921) is determined by the PI controller (930, 940). It is input and the wL * i q * and wL * i d * values are added to and deducted from the PI controllers 930 and 940 to perform current control.
  • the rear end system 990 generates currents iq 913 and id 923 which are supplied to the system through the output voltage of the current controller.
  • the current controller 900 enables the current control in consideration of the reactive power according to the present invention, and serves to adjust the voltage and phase. This current control function may be performed by the EMS 160 of FIG. 4A as an example.
  • FIG. 10 is a diagram illustrating a system for controlling reactive power and an example of a power conversion operation for supplying renewable energy and power from a battery according to an embodiment of the present invention.
  • the EMS 160 receives the power factor of the power system to receive reactive power through the multi-function power conversion system 100. By controlling, the power system can be stabilized.
  • the stabilization method has been described with reference to FIG. 9B.
  • FIG. 11 is a diagram illustrating an example of a power conversion operation for supplying power by alternative energy and a battery when a grid is disconnected according to an embodiment of the present invention.
  • the EMS 160 receives the power disconnect and immediately controls the multi-function power conversion system 100 to control the wind generator 110.
  • the solar generator 130 and possibly battery bank 150 supply power to the load.
  • KEPCO's power supply is accidentally shut down, it can also function as a large uninterruptable power supply (UPS) system that prevents power from being temporarily cut off through these alternative energy sources.
  • UPS uninterruptable power supply
  • FIG. 12 is a block diagram of a power conversion apparatus including a reactive power control function according to an embodiment of the present invention.
  • the alternative power input unit 1210 of the power converter 1200 receives alternative power from the auxiliary power supply 1290, which is a variety of alternative energy sources mentioned above.
  • the alternative energy source thus supplied may be converted into direct current through AC / DC switching if it is produced by alternating current, or stored in a charging power supply unit 1220 such as a battery bank through direct or simple filtering if produced by direct current. .
  • the charging power supply 1220 may include a capacitance component to perform a charging function.
  • the power conversion switch 1230 may be directly connected to the consumption load.
  • the power conversion switching unit 1230 may convert DC into AC by a switching operation such as PWM and supply the power to the consumption load or the grid.
  • profits can be generated by supplying alternative energy or consumer-generated electricity to grids such as KEPCO.
  • the alternating current generated by the power conversion switching unit 1230 is filtered by the rectifying filter unit 1240 including an inductor.
  • the power controller 1250 receives a power factor, an effective power demand, and a reactive power demand calculated from the consumption load connected to the output terminal of the power converter 1200 to obtain a phase difference between the voltage and the current output through the power converter switching unit 1230. This provides the power system with power factor, active power and reactive power required by the consumption load.
  • the power converter 1200 controls power conversion switching so that the active power and the reactive power meet the demand of the consumption load by feeding back power factor information of the consumption load instead of merely supplying the effective power to the power system. Has the ability to
  • the power control unit 1250 may charge the power from the auxiliary power supply 1290 to the charging power supply 1220 when the power supply of the consumption load does not need to be supplied from the auxiliary power supply 1290 or the charging power supply 1220. do.
  • the power control unit 1250 may charge electrical energy to the charging power supply unit 1220 through the power conversion switching unit 1230 from the main power supply of the main power supply such as KEPCO supplying power to the consumption load. have.
  • the power control unit 1250 may supply alternative energy inputted through the charging power supply unit 1220 or the alternative power input unit 1210 to the period power through the power conversion switching unit 1230.
  • FIG. 13 is a view illustrating a method of supplying a voltage and a current so that a power system can be stabilized by receiving power factor information, active power, and reactive power requirements from a grid to which a power consumption unit is connected according to an embodiment of the present invention. It is a flowchart showing.
  • the power control unit of the power converter receives the power factor information, the active power and the reactive power demand from the grid to which the consumption load is connected (S1310).
  • the power control unit applies a voltage command to be produced in the power conversion switching unit, a current command, and a power factor command to cause a difference between voltage and current according to the power factor information, the active power, and the reactive power requirements (S1320). It will show the magnitude of the voltage, the current command indicates the magnitude of the current, and the power factor command controls the power conversion switching to serve as a command for controlling the phase difference between the voltage and the current. If the power converter only supplies reactive power, the phase difference between voltage and current will be 90 degrees according to the power factor command.
  • the power conversion switching unit supplies a voltage and a current to the consumption load from at least one power supply device of at least one auxiliary power supply device and a charging power supply device based on the voltage command, current command and power factor command (S1330).
  • the phase difference between the voltage and the current produced above is controlled to maintain the power factor of the power factor information provided from the grid or the consumption load, and the power control unit may control the grid and the The charging power device is charged from at least one of the auxiliary power devices.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Cette invention concerne un système de conversion de puissance multifonctionnel qui régule la puissance active et la puissance réactive en faisant intervenir la puissance distribuée. Ledit système de conversion de puissance multifonctionnel selon l'invention comprend un dispositif d'alimentation auxiliaire utilisant l'énergie éolienne et/ou solaire, relié à un système électrique ; et un dispositif de puissance distribuée, tel qu'une batterie pour stocker provisoirement l'énergie, relié à celui-ci tout en étant relié au dispositif d'alimentation auxiliaire. Un convertisseur de secteur relie au système une source d'alimentation de grande capacité, telle qu'une source d'alimentation périodique ou une source d'alimentation principale. Ainsi, le statut de consommation d'énergie électrique est vérifié de façon à permettre la régulation de la puissance active et de la puissance réactive.
PCT/KR2011/008391 2010-11-15 2011-11-04 Procédé et dispositif de conversion de puissance mettant en oeuvre un dispositif de charge et doté d'une fonction de régulation de la puissance réactive WO2012067368A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/885,484 US20130234521A1 (en) 2010-11-15 2011-11-04 Method and device for multifunctional power conversion employing a charging device and having reactive power control

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20100113183 2010-11-15
KR10-2010-0113183 2010-11-15
KR10-2011-0015603 2011-02-22
KR1020110015603A KR101135284B1 (ko) 2010-11-15 2011-02-22 충전장치를 채용하고 무효전력 제어기능을 갖는 다중기능 전력변환 장치 및 방법

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WO2012067368A3 WO2012067368A3 (fr) 2012-07-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103368441A (zh) * 2013-07-03 2013-10-23 东南大学 一种单相并网变流器的矢量控制方法
CN104283231A (zh) * 2013-08-20 2015-01-14 南通大学 实施双电池组在线运行策略的风储混合电站
US10734821B2 (en) 2018-03-08 2020-08-04 Saudi Arabian Oil Company Power control system

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JP2006060984A (ja) * 2004-08-24 2006-03-02 Matsushita Ecology Systems Co Ltd 電源装置
JP2007228737A (ja) * 2006-02-24 2007-09-06 Okinawa Electric Power Co Ltd 新エネルギー発電システム出力変動緩和装置
KR20070103854A (ko) * 2006-04-20 2007-10-25 한국전기연구원 분산발전 시스템의 전력변환장치 및 이를 이용한 절체방법
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JP2006060984A (ja) * 2004-08-24 2006-03-02 Matsushita Ecology Systems Co Ltd 電源装置
JP2007228737A (ja) * 2006-02-24 2007-09-06 Okinawa Electric Power Co Ltd 新エネルギー発電システム出力変動緩和装置
KR20070103854A (ko) * 2006-04-20 2007-10-25 한국전기연구원 분산발전 시스템의 전력변환장치 및 이를 이용한 절체방법
JP2010074989A (ja) * 2008-09-19 2010-04-02 Tokyo Gas Co Ltd 分散型電源システム及びこのシステムを用いた系統電圧安定化方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103368441A (zh) * 2013-07-03 2013-10-23 东南大学 一种单相并网变流器的矢量控制方法
CN104283231A (zh) * 2013-08-20 2015-01-14 南通大学 实施双电池组在线运行策略的风储混合电站
CN104283231B (zh) * 2013-08-20 2016-04-06 南通大学 实施双电池组在线运行策略的风储混合电站
US10734821B2 (en) 2018-03-08 2020-08-04 Saudi Arabian Oil Company Power control system

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