KR101556893B1 - Wind power generator type energy storage system and method thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for supplying a large amount of starting power for a short time required for starting a wind turbine generator through a converter (MSC) and a charge / discharge type battery in a microgrid environment in a micro grid environment, The present invention relates to an energy storage system and method for a wind turbine generator that can prevent a flicker, a voltage drop or a power outage that can occur, and can operate a stable micro grid by supplying wind turbine power through a grid side converter (GSC) will be. The energy storage system for a wind turbine according to the present invention includes: a wind turbine generator for generating electric power by wind power; A load that consumes the generated power; A grid for controlling power generated from the wind power generator to be supplied to the load; A charge / discharge type battery for supplying power required for initial operation of the wind power generator and for charging electric power generated from the driven wind power generator; A machine side converter (MSC) for converting direct current (DC) power supplied from the charge / discharge type battery to AC power and supplying the alternating current (AC) power to the wind power generator at an initial operation of the wind power generator; And a grid side converter (GSC: Grid Side Converter) for constantly supplying power required for the system from the charge / discharge type battery to the load.

Description

Technical Field [0001] The present invention relates to an energy storage system for a wind power generator,

The present invention relates to an energy storage system and method for a wind power generator, and more particularly, to a power storage system and method for a wind power generator, in which a large amount of starting power required for starting a wind power generator in a small scale micro grid environment, (GSC: Grid Side Converter), it is possible to prevent the flicker, voltage drop or electrostatic discharge which may occur in the micro grid by supplying power from the MSC (Machine Side Converter) And more particularly, to an energy storage system and method for a wind turbine generator capable of supplying a generated power and operating a stable micro grid.

Conventional squirrel-cage induction wind turbine generators have no problem because they use the power required for initial drive from a large scale system, but they can not supply the power required for initial drive as shown in FIG. 1 in a small scale system. In order to connect such a direct-start-driven wind power generator to a small scale grid or a microphone grid, a device capable of solving the initial drive current problem is needed.

That is, in a conventional small-scale wind turbine generator, the grid and the generator are directly connected to each other. In order to drive the generator at the beginning, the starting power is consumed as shown in FIG. 1 and the generator is driven, When it is generated, it has a structure to be transmitted to the load. Thus, there is a need for a device that will initially supply the power required to drive the generator.

In addition, if irregular wind power generation is connected to the micro grid, the equilibrium between demand and supply is not smooth, so there is no wind power generation when necessary and power is left when power demand is low do. Therefore, a device capable of supplying a desired amount of power at a desired time is needed.

On the other hand, there is an increasing trend to supply power by combining renewable energy and energy storage system (ESS) instead of diesel generators in small and medium-sized islands powered by diesel generators.

In addition, it is more economical to build a standalone power system than to connect grassland, desert, jungle, and islands to a large scale system using a long-distance transmission line.

Therefore, in order to realize a direct-start-type wind turbine in a microgrid environment in an area where power supply is needed in a remote place such as Indonesia, a device for supplying power necessary for initial drive and a device for storing energy generated after the power generation, As shown in Fig.

Korean Patent Laid-Open Publication No. 2011-0063378 (Published on June 10, 2011)

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems and provide a method of operating a wind turbine generator in a small micro grid environment, in which a large amount of starting power required for starting a wind turbine generator is supplied to a converter It is possible to prevent flicker, voltage drop or power outage that may occur in the micro grid by supplying it through a discharge type battery. Also, it is possible to supply the wind power generation power through the grid side converter (GSC) And an energy storage system and method for a wind power generator.

According to an aspect of the present invention, there is provided a wind power generator for generating electric power by wind power; A load that consumes the generated power; A grid for controlling power generated from the wind power generator to be supplied to the load; A charge / discharge type battery for supplying power required for initial operation of the wind power generator and for charging electric power generated from the driven wind power generator; A machine side converter (MSC) for converting direct current (DC) power supplied from the charge / discharge type battery to AC power and supplying the alternating current (AC) power to the wind power generator at an initial operation of the wind power generator; And a grid side converter (GSC: Grid Side Converter) for constantly supplying power to the load from the charge / discharge type battery to the load.

In addition, the charge / discharge type battery may be configured such that when the state of charge (SOC) of the charge / discharge type battery is low and power required for initial operation of the wind turbine generator is insufficient, power required for initial operation of the wind turbine generator A certain amount of electric power is charged until it is filled.

Also, the generator-side converter MSC is connected between the charge / discharge type battery and the wind power generator so as to execute a CVCF (Constant Voltage Constant Frequency) control operation, and the power generated from the wind power generator is supplied to the charge / And stored in the battery.

In addition, the generator-side converter MSC supplies the charge / discharge type battery so as to be charged from the wind power generator without supplying power to the system differently depending on weather condition and time.

In addition, the grid-side converter GSC is connected between the grid and the charge / discharge type battery, and performs power quality (PQ) control operation so that power is not applied from the grid to the wind turbine during operation .

Also, the grid-side converter GSC constantly supplies electric power required for the system from the charge / discharge type battery to the load in accordance with a power command from the energy management system (EMS).

When the grid-side converter GSC does not operate, the voltage of the charge / discharge type battery becomes larger than the peak of the voltage of the grid, and the power of the grid is transmitted to the charge / discharge type battery So as to act as a diode rectifier.

In addition, the generator-side converter MSC may include a high-output inverter operating with a capacity capable of handling the driving power of the wind power generator.

In addition, the grid-side converter GSC operates at a capacity corresponding to the average power generation amount in order to supply power to the system at an average power generation amount rather than an instantaneous peak power of the wind power generator.

The generator side converter MSC or the grid side converter GSC may include a three-phase switching semiconductor element and a diode.

According to another aspect of the present invention, there is provided a wind power generator for a system including a wind power generator and a load, a grid, a charge / discharge type battery, a generator side converter (MSC), and a grid side converter (GSC) (A) supplying power required for initial drive from the charge / discharge type battery to the generator side converter (MSC); (b) converting the DC power required for the initial drive by the generator side converter (MSC) into AC power and supplying the AC power to the wind power generator; (c) the wind power generator is initially driven by the AC power supplied from the generator side converter (MSC); (d) generating electric power by wind power after the wind turbine is driven; (e) charging the charge / discharge type battery by converting power generated in the wind power generator into DC power by the generator side converter (MSC); And (f) the grid-side converter (GSC) constantly supplying power to the load from the charge / discharge type battery to the system.

In the step (b), the generator-side converter MSC operates at a capacity capable of handling the driving power of the wind turbine generator through a high-output inverter, and sequentially supplies driving power when the wind turbine generator .

In the step (e), when the charge / discharge type battery is low in state of charge (SOC) and the power required for the initial operation of the wind turbine is insufficient, power is supplied from the system to the wind turbine A certain amount of electric power is charged until the electric power necessary for the initial drive of the electric motor is filled.

In the step (e), the generator-side converter MSC is connected between the charge / discharge type battery and the wind power generator to execute a CVCF (Constant Voltage Constant Frequency) control operation, And the electric power is stored in the charge / discharge type battery.

Also, in the step (e), the generator-side converter MSC charges the charge / discharge type battery without supplying it to the system for power generated differently according to climatic conditions and time from the wind power generator .

In the step (f), the grid-side converter GSC is connected between the grid and the chargeable / dischargeable battery, and the power quality is adjusted so that power is not applied from the grid to the wind turbine during operation. , PQ) control operation.

In the step (f), the grid-side converter GSC constantly supplies electric power required for the system from the charge / discharge type battery to the load in accordance with a power command from the energy management system (EMS).

In the step (f), when the grid-side converter GSC does not operate, the voltage of the charge / discharge type battery becomes larger than the peak of the voltage of the grid, And acts as a diode rectifier so as not to be transmitted to the discharge type battery side.

In the step (f), the grid-side converter (GSC) operates at a capacity corresponding to the average power generation amount in order to supply power to the grid at an average power generation amount, not an instantaneous peak power of the wind power generator.

According to the present invention, a large amount of starting power for a short time required for starting a wind turbine generator is supplied through a generator-side converter (MSC) and a charge / discharge type battery so that a flicker, a voltage drop, And can supply a required amount of power through the grid side converter (GSC) to operate a stable microgrid.

In addition, it is possible to provide an energy storage system (ESS) suitable for a small-scale system satisfying both a power company operating a small-scale grid and a power user.

Also, since the controller is configured to remove the current controller to fit the small system and supply the constant voltage to the load, the voltage fluctuation is smaller, so a separate device and controller are required to keep the system voltage constant The system cost can be reduced.

1 is a diagram showing an example of the configuration of a conventional small scale wind turbine generator.
2 is a block diagram showing functional blocks of an energy storage system for a wind power generator according to an embodiment of the present invention.
3 is a flowchart illustrating an energy storage method for a wind turbine according to an embodiment of the present invention.
4 is a diagram illustrating an example of a circuit configuration of an MSC and a GSC according to an embodiment of the present invention.
5 is a diagram illustrating an example of a circuit configuration for supplying power required for initial operation of a wind turbine according to an embodiment of the present invention.
6 is a diagram illustrating an example of a voltage drop occurring during initial operation of the wind turbine according to the embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that it is not intended to be limited to the particular embodiments of the invention but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Embodiments of an energy storage system and method for a wind power generator according to the present invention will be described in detail with reference to the accompanying drawings. In the following description with reference to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, and a redundant description thereof will be omitted.

2 is a block diagram showing functional blocks of an energy storage system for a wind power generator according to an embodiment of the present invention.

2, an energy storage system 200 for a wind power generator according to an embodiment of the present invention includes a wind power generator 210, a load 220, a grid 230, a charge / discharge type battery 240, Side converter (MSC) 250 and a grid side converter (GSC)

The wind power generator 210 generates electric power by wind power.

The load 220 consumes the power generated by the wind power generator 210.

The grid 230 controls the power generated from the wind power generator 210 to be supplied to the load 220.

The charge / discharge type battery 240 supplies power required for initial operation of the wind power generator 210, and then charges the power generated from the driven wind power generator 210.

When the state of charge (SOC) of the charge / discharge type battery 240 is low and the power required for the initial operation of the wind power generator 210 is insufficient, the charge / discharge type battery 240 receives power from the system, A certain amount of electric power is charged until the electric power required for the initial driving is filled.

The MSC 250 converts the DC power supplied from the charge / discharge type battery 240 to AC power during the initial operation of the wind power generator 210 and supplies the AC power to the wind power generator 210.

In addition, the MSC 250 may include a high-power inverter operating at a capacity capable of handling the driving power of the wind power generator 210.

The GSC 260 constantly supplies power to the load 220 from the charge / discharge type battery 240.

In addition, the MSC 250 and the GSC 260 may include a three-phase switching semiconductor device and a diode as shown in FIG. 4 is a diagram illustrating an example of a circuit configuration of an MSC and a GSC according to an embodiment of the present invention. As shown in FIG. 4, the three-phase switching semiconductor device can be formed of, for example, an insulated gate bipolar transistor (IGBT) or an IBFT device.

The GSC 260 is connected between the chargeable and dischargeable battery 240 and the wind power generator 210 so as to execute a CVCF (Constant Voltage Constant Frequency) control operation and supplies the power generated from the wind power generator 210 to a rechargeable battery (240).

The GSC 260 also supplies to the chargeable and dischargeable battery 240 from the wind turbine 210 to be charged without supplying power to the system differently depending on weather conditions and time.

The GSC 260 is connected between the grid 230 and the chargeable and dischargeable battery 240 and controls the power quality such that power is not applied from the grid 230 to the wind turbine 210 during operation. PQ) control operation.

The GSC 260 also supplies the power required for the system from the chargeable and dischargeable battery 240 constantly to the load 220 in accordance with the power command from the power management system (PMS) or the energy management system (EMS) do.

When the GSC 260 does not operate, the voltage of the chargeable and dischargeable battery 240 is larger than the peak of the voltage of the grid 230 so that the electric power of the grid 230 is supplied to the chargeable and dischargeable battery 240 as a diode rectifier.

The GSC 260 operates at a capacity corresponding to the average power generation amount in order to supply electric power to the system at an average power generation amount rather than the instantaneous peak power of the wind power generator 9210. [

3 is a flowchart illustrating an energy storage method for a wind turbine according to an embodiment of the present invention.

3, in the energy storage system 200 for a wind turbine according to an embodiment of the present invention, the power required for initial drive from the charge / discharge type battery 240 is first supplied to the MSC 250 (S310 ).

Next, the MSC 250 converts the DC power required for initial driving into AC power and supplies the AC power to the wind power generator 210 (S320).

At this time, the MSC 250 operates at a capacity capable of handling the driving power of the wind power generator 210 through the high-output inverter, and sequentially supplies driving power when there are several wind power generators.

Next, the wind power generator 210 is initially driven by the AC power supplied from the MSC 250 (S330).

At this time, when the wind turbine generator 210 corresponds to the farm-type induction wind turbine generator, the power required for the initial drive is used through the circuit configuration as shown in FIG. 5 is a diagram illustrating an example of a circuit configuration for supplying power required for initial operation of a wind turbine according to an embodiment of the present invention. 5, the maximum value after the 0.2-second current limitation through the soft-starter at the initial operation of the 250 kW class induction induction wind turbine is 1100 A, and the required apparent power can be obtained as shown in the following Equation 1.

On the other hand, when the wind turbine generator 210 is a farm type induction wind turbine generator used in a small scale micro grid, a voltage drop occurs as shown in FIG. 6 is a diagram illustrating an example of a voltage drop occurring during initial operation of the wind turbine according to the embodiment of the present invention. As shown in FIG. 6, at the time of 2.2 seconds, the voltage drop of the wind power generator 210 at the time of initial operation is maximum 55%, which also affects the voltage supplied to the load 220 side. However, as the charge / discharge type battery 240, the MSC 250, and the GSC 260 are constructed as in the embodiment of the present invention, a voltage drop of 55% occurs between the wind power generator 210 and the MSC 250 , And the voltage drop between the GSC 260 and the load 220 side is 0%.

Next, after the wind power generator 210 is driven, power is generated by the wind power (S340).

Then, the MSC 250 converts the power generated from the wind power generator 210 into DC power and charges the chargeable and dischargeable battery 240 (S350).

When the state of charge (SOC) of the charge / discharge type battery 240 is low and the power required for the initial operation of the wind power generator 210 is insufficient, the charge / discharge type battery 240 receives power from the system, A certain amount of electric power is charged until the electric power required for driving is filled.

The MSC 250 is connected between the chargeable and dischargeable battery 240 and the wind power generator 210 so as to execute a CVCF (Constant Voltage Constant Frequency) control operation, And stored in the dischargeable battery 240.

In addition, the MSC 250 charges the chargeable and dischargeable battery 240 without supplying it to the system for power generated differently depending on weather conditions and time from the wind power generator.

Then, the GSC 260 constantly supplies power to the load 220 from the charge / discharge type battery 240 (S360).

At this time, the GSC 260 is connected between the grid 230 and the chargeable / dischargeable battery 240, and controls the power quality (PQ) so that power is not applied from the grid 230 to the wind power generator 210 ) Control operation.

The GSC 260 also constantly supplies the power required for the system from the chargeable and dischargeable battery 240 to the load 220 in accordance with the power command from the power management system (PMS) or the energy management system (EMS) .

When the GSC 260 does not operate, the voltage of the chargeable and dischargeable battery 240 is larger than the peak of the voltage of the grid 230 so that the electric power of the grid 230 is supplied to the chargeable and dischargeable battery 240 (Not shown) of the diode rectifier.

The GSC 260 operates at a capacity corresponding to the average power generation amount in order to supply electric power to the system at an average power generation amount rather than an instantaneous peak power of the wind power generator 210.

As described above, according to the present invention, when a cage-type induction wind power generator is used in a small-scale micro grid environment, a large amount of starting power required for starting the wind power generator is supplied to a converter (MSC) (GSC) to supply the wind power generation power and to operate the stable micro grid, it is possible to supply the power for the wind power generator A storage system and method can be realized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

The present invention relates to a method and apparatus for supplying a large amount of starting power for a short time required for starting a wind turbine generator through a converter (MSC) and a charge / discharge type battery in a microgrid environment in a micro grid environment, Applicable to energy storage system and method for wind turbine generator that can prevent flicker, voltage drop or power outage that can occur, and can operate stable micro grid by supplying wind power generator power through grid side converter (GSC) can do.

200: Energy storage system for wind power generator 210: Wind power generator
220: load 230: grid
240: charge / discharge type battery 250: MSC
260: GSC

Claims (19)

A wind turbine generating electric power by wind power;
A load that consumes the generated power;
A grid for controlling power generated from the wind power generator to be supplied to the load;
A charge / discharge type battery for supplying power required for initial operation of the wind power generator and for charging electric power generated from the driven wind power generator;
A machine side converter (MSC) for converting direct current (DC) power supplied from the charge / discharge type battery to AC power and supplying the alternating current (AC) power to the wind power generator at an initial operation of the wind power generator; And
Wherein a voltage of the charge / discharge type battery is greater than a peak of a voltage of the grid when the load is not actuated, A grid side converter (GSC) functioning as a diode rectifier so as not to be transmitted to the charge / discharge type battery;
And an energy storage system for a wind power generator.
The method according to claim 1,
When the state of charge (SOC) of the charge / discharge type battery is low and the power required for the initial operation of the wind turbine is insufficient, the charge / discharge type battery is supplied with electric power from the system to fill the power required for initial operation of the wind turbine The energy storage system for a wind power generator is charged with a predetermined amount of power until a predetermined time elapses.
The method according to claim 1,
The generator-side converter MSC is connected between the charge / discharge type battery and the wind power generator so as to perform a CVCF (Constant Voltage Constant Frequency) control operation. The power generated from the wind power generator is supplied to the charge / And the energy storage system for the wind turbine.
The method according to claim 1,
Wherein the generator-side converter (MSC) is supplied to the charge / discharge type battery so as to be charged from the wind power generator to the system in a manner that does not supply power differently generated according to climatic conditions and time. system.
The method according to claim 1,
The grid-side converter GSC is connected between the grid and the charge / discharge type battery, and performs a power quality (PQ) control operation so that power is not applied from the grid to the wind turbine during operation And the energy storage system for a wind power generator.
The method according to claim 1,
The grid-side converter (GSC) constantly supplies electric power required for the system from the charge / discharge type battery to the load in accordance with a power command from a power management system or an energy management system (EMS) Energy storage systems for energy use.
delete The method according to claim 1,
Wherein the generator-side converter MSC includes a high-output inverter that operates with a capacity to sustain the driving power of the wind power generator.
The method according to claim 1,
Wherein the grid-side converter (GSC) operates at a capacity corresponding to an average power generation amount in order to supply power to the grid at an average power generation amount rather than an instantaneous peak power of the wind power generator.
The method according to claim 1,
Wherein the generator side converter (MSC) or the grid side converter (GSC) comprises a three-phase switching semiconductor device and a diode.
A method of energy storage for a wind turbine in a system comprising a wind power generator and a load, a grid, a charge and discharge battery, a generator side converter (MSC) and a grid side converter (GSC)
(a) supplying power to the generator-side converter (MSC) necessary for initial driving from the charge / discharge type battery;
(b) converting the DC power required for the initial drive by the generator side converter (MSC) into AC power and supplying the AC power to the wind power generator;
(c) the wind power generator is initially driven by the AC power supplied from the generator side converter (MSC);
(d) generating electric power by wind power after the wind turbine is driven;
(e) charging the charge / discharge type battery by converting power generated in the wind power generator into DC power by the generator side converter (MSC); And
(f) The grid-side converter GSC constantly supplies power to the load from the charge / discharge type battery to the load, and when the grid-side converter GSC does not operate, Acting as a diode rectifier such that the voltage is greater than a peak of the voltage of the grid so that power of the grid is not delivered to the charge / discharge battery side;
Wherein the energy storage method comprises the steps of:
The method of claim 11,
Wherein the step (e) includes the steps of: when the charge / discharge type battery is in a low state of charge (SOC) and the power required for initial operation of the wind turbine is insufficient, And a predetermined amount of electric power is charged until the electric power required for driving is filled.
The method of claim 11,
In the step (e), the generator-side converter MSC is connected between the charge / discharge type battery and the wind power generator so as to execute a CVCF (Constant Voltage Constant Frequency) control operation, and the power generated from the wind power generator And storing the energy in the charge / discharge type battery.
The method of claim 11,
The step (e) is characterized in that the generator-side converter (MSC) is charged into the charge / discharge type battery without supplying it to the system for power generated differently according to weather conditions and time from the wind power generator Energy storage method for a wind power generator.
The method of claim 11,
In the step (f), the grid-side converter GSC is connected between the grid and the chargeable and dischargeable battery, and power quality (PQ) is adjusted so that power is not applied from the grid to the wind turbine during operation. ) Control operation is executed.
The method of claim 11,
Wherein the step (f) includes the steps of: determining whether the grid-side converter (GSC) supplies the power required for the grid from the charge / discharge type battery to the load according to a power command from a power management system (PMS) or an energy management system Wherein the energy of the energy stored in the energy storage device is supplied to the energy storage device.
delete The method of claim 11,
In the step (b), the generator-side converter (MSC) operates at a capacity capable of handling the driving power of the wind turbine generator through a high-output inverter, and sequentially supplies driving power when the plurality of wind turbine generators A method of storing energy for a wind power generator.
The method of claim 11,
Wherein the step (f) comprises operating the grid-side converter (GSC) at a capacity corresponding to an average power generation amount in order to supply power to the grid at an average power generation amount, not an instantaneous peak power of the wind power generator Energy storage method.

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