KR20160129266A - Grid connected power apparatus using solar converter, energy storage converter and wind converter - Google Patents

Abstract

Disclosed is a system link type integration device using a photovoltaic converter, an energy storage converter, and a wind converter. The photovoltaic converter includes solar cells for receiving solar light and converting the solar energy into electric energy and controls the solar cells to yield the maximum photovoltaic power generation output. The wind converter includes a wind power generation unit for converting wind energy into electric energy and controls the wind power generation unit to yield the maximum wind power generation output. The energy storage converter includes a battery and charges the battery using the photovoltaic power and the wind power. A system link type inverter converts the power from the photovoltaic converter, the wind converter, and the energy storage converter into AC and transmits the AC to the system. Each of the photovoltaic converter, the wind converter, the energy storage converter, and the system link type inverter includes a power conversion module, and each power conversion module is controlled by a plurality of CPUs. According to the present invention, by combining the photovoltaic converter, the wind converter, and the energy storage converter, the present invention links the photovoltaic power, the wind power, and the battery in one converter and accordingly can manage the photovoltaic power, the wind power, and the battery at the same time.

Description

Technical Field [0001] The present invention relates to a grid-connected power apparatus using a solar converter, an energy storage converter, and a wind-

The present invention relates to a grid-connected type integrated device using solar photovoltaic converters, energy storage converters, and wind power converters, and more particularly, to grid-connected integrated devices using solar converters, energy storage converters, Type integrated device.

As depletion of natural resources and environmental and stability problems for nuclear power generation are emerging, there is a growing interest in solar energy and small wind power, which are representative green-friendly green energy. In particular, photovoltaic power generation is widely used in a wide variety of fields such as automobiles, toys, residential generators, and street lamps. However, solar power generation and wind power generation vary in power generation depending on weather conditions, and therefore, attempts have been made to regulate the power generation using a battery for power generation control.

Patent Registration No. 10-1181403: Grid-linkage system using solar and wind power hybrid power generation and power generation system using photovoltaic and wind power hybrid grid Patent Registration No. 10-0891513: Grid-connected hybrid power generation system using photovoltaic and battery system and power generation method using the same

SUMMARY OF THE INVENTION The present invention is directed to a photovoltaic power generation system that combines a solar photovoltaic converter, an energy storage converter, and a wind power converter, Converters, energy storage converters, and wind-powered converters.

According to an aspect of the present invention, there is provided a grid-connected type integrated device using a solar photovoltaic converter, an energy storage converter, and a wind power converter, including a solar cell for converting solar energy into electric energy upon receiving sunlight, A photovoltaic converter for controlling the photovoltaic power output; A wind power converter including a wind power generator for converting wind energy into electric energy to control the maximum wind power output; An energy storage converter including a battery for charging the photovoltaic power and wind power with the battery; And a grid-connected inverter converting the power of the solar photovoltaic converter, the wind power converter, and the energy storage converter into an AC voltage and transmitting the power to the grid, wherein the solar photovoltaic converter, the wind energy converter, the energy storage converter and the grid- And a power conversion module, wherein each of the power conversion modules is controlled through a plurality of CPUs.

According to the grid-connected integrated device using the solar photovoltaic converter, the energy storage converter, and the wind power converter according to the present invention, the solar photovoltaic converter, the energy storage converter, and the wind power converter are combined, Solar power, wind power, and batteries can be managed at the same time.

FIG. 1 is a block diagram illustrating the configuration of a grid-connected integrated device using a solar photovoltaic converter, an energy storage converter, and a wind power converter according to the present invention,
2 is a block diagram illustrating a power conversion control unit for controlling a power conversion module of a grid-connected integrated device using a solar photovoltaic converter, an energy storage converter, and a wind power converter according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a grid-connected integrated device 100 using a solar photovoltaic converter, an energy storage converter, and a wind power converter according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a grid-based integrated apparatus 100 using a solar photovoltaic converter, an energy storage converter, and a wind power converter according to the present invention.

Referring to FIG. 1, a grid-based integrated apparatus 100 using a solar light converter, an energy storage converter and a wind power converter according to the present invention includes a solar light converter 200, an energy storage converter 300, a wind power converter 400, And a grid interconnected inverter (500).

The solar converter 200 includes a solar cell 210 that is irradiated with sunlight and converts solar energy into electric energy, and controls the solar battery 200 to output a maximum solar power output. In addition, since DC (direct current) voltage must be increased when DC (direct current) is converted into AC (alternating current) in the grid-connected inverter 500, the solar voltage is boosted.

The wind power converter 400 includes a wind power generator 410 for converting wind energy into electric energy to control the maximum wind power output. The wind power output is output in three-phase alternating current, but can not be connected directly to the system. Therefore, the three-phase AC (alternating current) of wind power generation is firstly converted to DC (direct current). The DC (Direct Current) voltage needs to be increased in order to convert the converted DC (direct current) into the AC (Alternating Current) of the grid interconnection inverter 500 and to link it to the system, thereby boosting the wind voltage.

The wind power converter 400 may be used for power generation such as hydroelectric power generation in a generator similar to wind power generation or biofuel generation using biodiesel.

The energy storage converter 300 boosts the battery voltage because the DC (direct current) voltage must be raised when the DC (direct current) is converted into AC (alternating current) in the grid interconnected inverter 500 when the battery 310 is discharged. Further, when the battery 310 is charged, a voltage higher than the voltage of the battery 310 is lowered to the voltage of the battery 310 to control the constant current charging.

The grid-connected inverter 500 converts the electric power of the solar photovoltaic converter 200, the wind power converter 400, and the energy storage converter 300 into alternating current and transmits the same to the grid. Also, if battery 310 needs to be charged, AC (alternating current) power of the system is converted into DC (direct current) to supply power to energy storage converter 300.

At this time, the solar power converter 200, the energy storage converter 300, the wind power converter 400, and the grid interconnected inverter 500 include power conversion modules 220, 320, 420 and 520, respectively, The conversion modules 220, 320, 420, and 520 are controlled through a plurality of CPUs. Each of the power conversion modules 220, 320, 420, and 520 will be described later.

2 is a power conversion control unit 600 for controlling each power conversion module 220, 320, 420, 520 of the grid-connected integrated device 100 using the solar photovoltaic converter, the energy storage converter and the wind power converter according to the present invention, Fig.

Referring to FIG. 2, each of the power conversion modules 220, 320, 420, and 520 includes a measurement unit 610, a control unit 620, and a monitoring unit 630.

The measuring unit 610 measures all voltages and currents for power conversion control. The information measured by the measuring unit 610 is input to the control unit 620 and the monitoring unit 630. The control unit 620 performs switching control for power conversion and performs pulse width modulation (PWM) control for power conversion based on the information measured by the measuring unit 610. At this time, the switching frequency of the pulse width modulation (PWM) control can be set in the range of 2 [kHz] to 20 [kHz].

The monitoring unit 630 monitors the occurrence of malfunctions in the pulse width modulation (PWM) control. Specifically, the monitoring unit 630 monitors the power conversion module using a sampling time higher than the pulse width modulation (PWM) control switching frequency. For example, when controlling the power conversion modules 220, 320, 420 and 520 in the controller 620, the switching frequency of the PWM control may be 5 [kHz], 10 [kHz] 15 [kHz], and 20 [kHz], the monitoring unit 630 controls the sampling frequency to be higher than the sampling frequency of the pulse width modulation (PWM) control switching frequency, for example, 20 kHz, 40 kHz, 80 [kHz] and 100 [kHz], respectively. This monitors the overcurrent and overvoltage that may occur during the switching on / off time with a sampling time higher than the switching frequency, thereby monitoring the overcurrent and overvoltage that may occur during switching to prevent burnout.

The control unit 620 and the monitoring unit 630 operate as respective CPUs, and can transmit and receive necessary data through mutual communication to proceed with the control. The communication method used at this time is SPI (serial synchronous communication) and SCI (serial asynchronous communication). The monitoring unit 630 receives a signal from the control unit 620 through a monitoring unit filter (not shown) and passes the signal if there is no abnormality. If a malfunction is monitored due to abnormal control, . When the control abnormal phenomenon disappears, the operation is restarted again to prevent malfunction and burnout due to control abnormality. At this time, the control abnormal phenomenon occurs when a voltage or current that does not match the rated capacity of each power conversion module 220, 320, 420, 520 flows, for example, an overvoltage or an overcurrent exceeding 10% 630), it is determined that the control is abnormal.

Each of the power conversion modules 220, 320, 420, 520 modularizes accessories according to functions, and each of the power conversion modules 220, 320, 420, 520 itself is modularized. The functional accessory may be at least one of an insulated gate bipolar transistor (IGBT), a heat sink, a capacitor, and a current transformer. Each of the power conversion modules 220, 320, 420, and 520 modularized as described above includes the photovoltaic converter, the energy storage converter, and the photovoltaic converter (each component of the grid- 200, an energy storage converter 300, a wind power converter 400, and a grid interconnected inverter 500.

1, a first power conversion module 220 is connected to the solar photovoltaic converter 200, a second power conversion module 320 is connected to the energy storage converter 300, The third power conversion module 420 is connected to the grid-connected inverter 500, and the third power conversion module 520 is connected to the grid-connected inverter 500. Each of the power conversion modules 220, 320, 420, and 520 may be adaptively activated / deactivated for a desired environment. Therefore, it is possible to implement the inverter for solar power generation using i) solar photovoltaic converter 200-grid interconnected inverter 500 using only adaptively required power conversion modules 220, 320, 420, 520, or ii) The energy storage inverter 300 may be implemented using the energy storage converter 300 or the grid-connected inverter 500, or iii) the wind turbine inverter may be implemented using the wind power converter 400 and the grid- Alternatively, a solar-wind-energy storage inverter may be implemented using the solar inverter 200, the energy storage converter 300, the wind power converter 400, and the grid-connected inverter 500. Accordingly, the grid-based integrated device 100 using the solar photovoltaic converter, the energy storage converter, and the wind power converter according to the present invention can implement four types of inverters.

As described above, the grid-based integrated device 100 using the solar photovoltaic converter, the energy storage converter, and the wind power converter according to the present invention can be realized as a single model through the modularization of the power conversion modules 220, 320, 420, Four types of inverters can be produced. As a result, it is possible to save space by occupying less space than installing three solar inverters, wind inverters and energy storage inverters, and it is possible to increase the energy utilization efficiency by using three units. Furthermore, since the product is manufactured using only a single module, productivity can be increased and price competitiveness can be enhanced.

In the above description, terms such as 'first', 'second', and the like are used to describe various components, but each component should not be limited by these terms. That is, the terms 'first', 'second', and the like are used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a 'first component' may be referred to as a 'second component', and similarly, a 'second component' may also be referred to as a 'first component' . Also, the term " and / or " is used in the sense of including any combination of a plurality of related listed items or any of the plurality of related listed items.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the embodiment in which said invention is directed. It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

100: Grid-connected integrated device using solar converter, energy storage converter and wind power converter
200: Solar Converter
210: Solar cell
220: first power conversion module
300: Energy storage converter
310: Battery
320: second power conversion module
400: Wind power converter
410: Wind power generation part
420: third power conversion module
500: Grid-connected inverter
510: Grid
520: fourth power conversion module
600: power conversion control section
610:
620:
630:

Claims (6)

A solar photovoltaic converter including a solar cell irradiated with sunlight and converting solar energy into electric energy to control the maximum solar power output;
A wind power converter including a wind power generator for converting wind energy into electric energy to control the maximum wind power output;
An energy storage converter including a battery for charging the photovoltaic power and wind power with the battery; And
And a grid-connected inverter for converting the power of the solar photovoltaic converter, the wind power converter, and the energy storage converter into an alternating current and transmitting the same to the grid,
Wherein the photovoltaic converter, the wind power converter, the energy storage converter, and the grid interconnected inverter each include a power conversion module, and each of the power conversion modules is controlled through a plurality of CPUs. An Integrated Grid - Type Device Using Wind - Powered Converter. The method according to claim 1,
The power conversion module includes:
A grid-based integrated device using a solar converter, an energy storage converter, and a wind power converter, characterized in that the functional accessories are modularized. 3. The method of claim 2,
Wherein the function-specific accessory is at least one of an insulated gate bipolar transistor (IGBT), a heat sink, a capacitor, and a current transformer, and a grid-connected type using an energy storage converter and a wind- Integrated device. The method according to claim 1,
The power conversion module includes:
A measuring unit for measuring voltage and current for power conversion control;
A controller for controlling pulse width modulation (PWM) for power conversion based on the information measured by the measuring unit; And
And a monitoring unit monitoring the occurrence of a malfunction in the pulse width modulation control, wherein the monitoring unit monitors the occurrence of malfunctions in the pulse width modulation control. 5. The method of claim 4,
Wherein the switching frequency of the pulse width modulation control is 2 [kHz] to 20 [kHz]. 6. The method of claim 5,
Wherein the monitoring unit monitors the power conversion module using a sampling time higher than the switching frequency of the pulse width modulation control, wherein the monitoring unit monitors the power conversion module using a sampling time higher than the switching frequency of the pulse width modulation control.

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