KR101661822B1 - System and Method for Controlling Ramp Rate of Renewable Energy Source - Google Patents

Abstract

A system for controlling the output fluctuation rate of a renewable energy source according to an aspect of the present invention, which can minimize a communication delay occurring when data is transmitted and received for controlling the output fluctuation rate of a renewable energy source, A measuring device for measuring an output voltage and a first output current; A plurality of energy storage devices for performing charge and discharge in accordance with the first output voltage and the first output current received from the measuring device so that an output variation rate of the renewable energy source is within a target variation rate; And a power management device for receiving the SOC information of each energy storage device from the plurality of energy storage devices and calculating an output sharing ratio for each of the plurality of energy storage devices according to the received SOC information, Wherein each of the energy storage devices stores a first power generation output of the renewable energy source calculated using the first output voltage and a first output current, And a controller for calculating a charge / discharge command value to be charged / discharged by each of the energy storage devices at a time point t using the output share ratio of the plurality of energy storage devices, and performing charge / discharge in accordance with the charge / discharge command value .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and a method for controlling the rate of change of renewable energy,

The present invention relates to a generator output control method, and more particularly, to a system and method for controlling the output fluctuation rate of a renewable energy source that can control an output fluctuation rate of a renewable energy source.

Interest in new renewable energy is rapidly increasing due to various reasons such as persistent high oil prices, depletion of fossil fuels such as coal and oil, or greenhouse gas emission control due to global warming.

Here, the term renewable energy is a combination of new energy and renewable energy, which refers to energy that converts existing fossil fuels, or converts sunlight, water, precipitation, biological organisms, etc. into renewable energy. New energy includes fuel cells and hydrogen energy, and renewable energy includes solar, bio, wind, tidal, hydro, or geothermal.

Worldwide, investments are focused on the expansion and dissemination of renewable energy such as wind power and solar power generation. Renewable energy sources (RES), such as wind power and solar power, which have intermittent power generation characteristics, The severe output fluctuation characteristic greatly affects the stable operation of the linkage system.

Particularly, the influence of the development of these renewable energy sources is getting larger as the proportion of the total generation amount of the renewable energy sources is increased.

Therefore, conventionally, as shown in FIG. 1, in order to stabilize the output by the renewable energy source, a separate preliminary generator is installed and the preliminary generator is always kept in the ON state to cause the output fluctuation of the renewable energy source And the total output is stabilized through the generation of the spare generator.

However, in the case of the prior art shown in FIG. 1, since the spare generator must be kept in the ON state, energy is wasted and the proportion of the total renewable energy source is increased, There is a problem that the installation and maintenance cost of the preliminary generator is increased.

SUMMARY OF THE INVENTION It is a general object of the present invention to provide a new and renewable energy source output control apparatus and method capable of stabilizing the generation output of a renewable energy source without a separate preliminary generator.

Another object of the present invention is to provide a new and renewable energy source output variation rate control system and method capable of minimizing a communication delay occurring when data is transmitted and received for controlling the output variation ratio of a renewable energy source.

Another object of the present invention is to provide a new and renewable energy source output variation rate control system and method capable of controlling the power generation output of a renewable energy source within a target variation rate.

Another object of the present invention is to provide a new and renewable energy source output variation rate control system and method capable of controlling the power variation rate of a renewable energy source using a plurality of energy storage devices.

Another object of the present invention is to provide a system and method for controlling the output fluctuation rate of a renewable energy source that can control an output fluctuation rate of a renewable energy source while maintaining SOC of a plurality of energy storage devices constant .

According to an aspect of the present invention, there is provided a system for controlling an output variation ratio of a renewable energy source, comprising: a measuring device for measuring a first output voltage and a first output current of a renewable energy source at time t; A plurality of energy storage devices for performing charge and discharge in accordance with the first output voltage and the first output current received from the measuring device so that an output variation rate of the renewable energy source is within a target variation rate; And a power management device for receiving the SOC information of each energy storage device from the plurality of energy storage devices and calculating an output sharing ratio for each of the plurality of energy storage devices according to the received SOC information, Wherein each of the energy storage devices stores a first power generation output of the renewable energy source calculated using the first output voltage and a first output current, And a controller for calculating a charge / discharge command value to be charged / discharged by each of the energy storage devices at a time point t using the output share ratio of the plurality of energy storage devices, and performing charge / discharge in accordance with the charge / discharge command value .

According to another aspect of the present invention, there is provided a system for controlling an output variation ratio of a renewable energy source, comprising: a measuring device for measuring a first output voltage and a first output current of a renewable energy source at time t; And an output limit value Ramp (Ramp), which is an output limit value for controlling the first power generation output of the renewable energy source and the second renewable energy source calculated using the first output voltage and the first output current received from the measuring device, And an energy storage device for performing a charge / discharge operation according to the charge / discharge command value to adjust an output variation rate of the renewable energy source to be within a target variation rate .

According to another aspect of the present invention, there is provided a method for controlling the rate of change of output of a renewable energy source, the method comprising the steps of: A method of controlling a power variation rate of a circle, the power management apparatus comprising: calculating an output sharing ratio of the plurality of energy storage devices according to SOC information of each energy storage device; Each of the energy storage devices receiving a first output voltage and a first output current measured at time t from a measuring device connected to an output terminal of the renewable energy source; And each of said energy storage devices includes a first power generation output of said renewable energy source calculated using said first output voltage and a first output current in digital form, And calculating a charge / discharge command value at a time point t of the energy storage device using an output sharing ratio of the plurality of energy storage devices.

According to the present invention, there is no need of a separate preliminary generator for controlling the rate of change of the output of the renewable energy source, so that there is an effect that energy waste and economic loss caused by operation and installation of the preliminary generator can be minimized.

In addition, according to the present invention, it is possible to minimize the communication delay occurring when data is transmitted / received for controlling the output fluctuation rate of the renewable energy source, thereby increasing the response speed of the system and improving the reliability of the control It is effective.

In addition, according to the present invention, it is possible to control the output fluctuation rate of the new and renewable energy source within a range desired by the system operator, so that the power can be stably supplied to the linkage system.

In addition, according to the present invention, it is possible to control the rate of change of output of a renewable energy source by using a plurality of energy storage devices, so that the system can be applied to a region having a large amount of demanded electric power, thereby expanding the application range of the system.

In addition, according to the present invention, it is possible to maintain the SOC of a plurality of energy storage devices constant when controlling the output fluctuation rate of the renewable energy source, thereby preventing the battery from overcharging or overdischarging, Can be effective.

Further, according to the present invention, since the output fluctuation rate of the renewable energy source can be controlled within a quantitative numerical value range, it is possible to control the output fluctuation rate of the renewable energy source in accordance with the grid linkage of the renewable energy source Or an international standard such as a grid code (Grid Code).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 schematically shows the construction of a general power generation system; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
3 is a block diagram schematically illustrating the configuration of the energy storage device shown in FIG. 2. FIG.
Fig. 4 is a block diagram schematically showing the configuration of the controller shown in Fig. 3; Fig.
5 is a graph for conceptually illustrating a method for setting a target output by a target output setting unit shown in FIG.
6 is a graph showing a comparison between the power generation output of the stabilized renewable energy source according to the present invention and the power generation output of the renewable energy source to which the present invention is not applied.
7 is a graph showing a comparison between the output fluctuation rate of a renewable energy source to which the present invention is applied and the output fluctuation rate of a renewable energy source to which the present invention is not applied.
FIG. 8 is a flowchart illustrating a method for controlling a renewable energy output variation rate according to an embodiment of the present invention.

The meaning of the terms described herein should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram schematically showing a configuration of a power fluctuation rate control system for a renewable energy source according to an embodiment of the present invention.

2, the system 200 for controlling the power variation of the renewable energy source according to an embodiment of the present invention includes a measuring device 210, a power management device 220, and a plurality of energy storage devices 230).

First, the measuring device 210 is connected to an output terminal of the renewable energy source 260, more specifically, a point of common coupling (PPC) connected to the power system 270 of the renewable energy source 260, And the output voltage and output current of the renewable energy source 260 are measured for each time point.

In one embodiment, the measuring apparatus 210 includes a potentiometer (PT) connected to the output terminal of the renewable energy source 260 for measuring a first output voltage at time t, and a renewable energy source 260 And a current transformer (CT) connected to an output terminal of the current transformer for measuring a first output current at time t.

Next, a power management system (PMS) 220 controls the operation of a plurality of energy storage devices 230. In particular, the power management apparatus 220 according to the present invention receives SOC (State of Charge) information of each energy storage device 230 from the energy storage device 230, 230). Here, the output sharing ratio is a ratio of the output of all the energy storage devices 260 to the total energy storage devices 230 in order to make the output variation rate of the renewable energy source 260 be within the target variation rate Ratio.

In one embodiment, the power management apparatus 220 may calculate the output sharing ratio for each energy storage device 240 using Equation (1) below.

은 n번째 에너지 저장장치(230)의 출력 분담률을 나타내고,

은 n번째 에너지 저장장치(230)의 SOC을 나타내고, n은 에너지 저장장치(230)의 개수를 나타낸다.In Equation (1)

Represents the output sharing ratio of the n-th energy storage device 230,

N represents the SOC of the n-th energy storage device 230, and n represents the number of the energy storage devices 230.

The power management device 220 transfers the output sharing ratio of each energy storage device 230 to each energy storage device 230.

In one embodiment, the power management device 220 receives feedback on the actual output according to the charge / discharge command value and the charge / discharge command value of each energy storage device 230, And determines whether or not the output of the energy storage device 230 is being generated according to the output sharing ratio based on the output sharing ratio. As a result of the determination, when no output according to the output sharing ratio of each energy storage device 230 is generated, the power management device 220 requests the energy storage device 230 to request the SOC information of each energy storage device 230 again The output sharing ratio of each energy storage device 230 can be adjusted.

The plurality of energy storage devices 230 receives the first output voltage and the first output current in analog form from the measuring device 210 and performs charging and discharging in accordance with the first output voltage and the first output current, The regeneration rate of the regenerated energy source 260 is adjusted so that the target regression rate is within the range.

The output variation ratio control system 200 of the renewable energy source according to the present invention is configured such that a plurality of energy storage devices 230 receive the first output voltage and the first output current directly from the measurement device 210 in analog form Wired wiring 280 connecting the plurality of energy storage devices 230 and the measuring device 210 to each other so as to make the power storage devices 230 and the measurement devices 210 communicate with each other.

The hard wire wiring 280 includes a first hard wire wiring 282 connecting the instrument transformer 212 and a plurality of energy storage devices 230 and a plurality of energy storage devices 230 connecting the transformer 214 and the plurality of energy storage devices 230 And a second hard wire line 284.

Thus, each energy storage device 230 receives the first output voltage from the instrument transformer 212 in an analog form via the first hard wire wiring 282 and receives the first output voltage in analog form via the second hard wire wiring 284. [ And the first output current is supplied in an analog form from the output terminal 214.

Hereinafter, the configuration of the energy storage device 230 according to the present invention will be described in more detail with reference to FIG. 3 and FIG.

3 is a block diagram schematically illustrating the configuration of an energy storage device according to an embodiment of the present invention.

3, the energy storage device 230 according to the present invention includes a controller 232, a power conversion device 234, and a battery conditioning device 236. [

First, the controller 232 calculates a first power generation output, which is a power generation output of the renewable energy source 260 at time t, using the first output voltage and the first output current received through the hard wire wiring 280 (Ramp Set), which is an output limiting value for controlling the increase and decrease of the first and second renewable energy sources 260 and 260, and the output sharing ratio of each energy storage device 230, .

Here, the power generation output means an output actually developed by the renewable energy source 260 at each time point, and the target output means the output of the renewable energy source 260 adjusted according to the target variation rate at each time point.

Hereinafter, the configuration of the controller 232 will be described in more detail with reference to FIG.

4 is a block diagram schematically illustrating a configuration of a controller according to an embodiment of the present invention.

4, the controller 232 according to an exemplary embodiment of the present invention includes a first A / D converter 410, an operation unit 420, an input unit 430, a lamp set calculation unit 440, A target output calculating section 450, and an instruction value calculating section 460. [

The first A / D converter 410 converts the first output voltage and the first output current of the analog form, which are transmitted from the measuring device 210 via the first and second hard wire lines 282 and 284, 1 output voltage and the first output current.

The operation unit 420 calculates the first power generation output by multiplying the first output voltage and the first output voltage, which are converted into digital form, by the first A / D converter 410.

The input unit 430 receives the target variation rate of the power generation output of the renewable energy source 260 from the system operator. Here, the target fluctuation rate (Ramp Rate) means a fluctuation rate limit value of the power generation output of the renewable energy source 260 for a predetermined unit time. In one embodiment, the predetermined unit time may be one minute.

Although the target variation ratio is described as being input from the system operator in the above-described embodiment, in the modified embodiment, the input unit 430 may automatically set the target variation ratio based on the past data. For example, the input unit 430 may set the variation rate matching the data having the generation output most similar to the generation output at the current time among the past date and time that is the same as the current date and time among the past data as the target variation rate .

Next, the ramp set calculator 440 calculates a ramp set for controlling the increase and decrease of the renewable energy source 260. Here, the lamp set means a limit value of the power generation output of the renewable energy source 260, which is determined for each control cycle for controlling the increase and decrease of the renewable energy source 260.

In one embodiment, the ramp set calculator 440 may calculate a ramp set for controlling the increment / decrement ratio of the renewable energy source 260 using the following equation (2).

In Equation (2), Ramp Set denotes a lamp set, Rated Power denotes a rated output of the renewable energy source 260, Ramp Rate denotes a target fluctuation rate, and Control Period denotes an output control of the renewable energy source 260 And n and m represent a time correction coefficient determined according to the unit time of the target variation rate. For example, when the target fluctuation rate is an output fluctuation rate for one minute and the control period is determined in units of milliseconds (msec), n is set to 60 and m is set to 1000. [

Next, the target output calculating unit 450 calculates the target power of the renewable energy source 260 (260) using the first power generation output, the lamp set, and the first target power, which is the target output of the renewable energy source 260 at the time t- The target output at the time t of the first target output is calculated.

More specifically, the target output calculating section 450 calculates a difference value between the first power generation output and the first target output, and compares the calculated difference value with the ramp set. As a result of the comparison, if it is determined that the difference between the first power output and the first target output is larger than the lamp set, the target output calculating unit 440 additionally compares the magnitudes of the first power output and the first target output.

As a result of comparison, if the first power generation output is larger than the first target power, the target power calculation unit 450 calculates the second target power by adding the ramp set to the first target power. This can be expressed by the following equation (3).

Further, the target output calculating section 450 calculates the second target output by subtracting the ramp set from the first target output if the first power output is not greater than the first target output. This can be expressed by the following equation (4).

In Equations (3) and (4), Target _t represents a second target output which is a target output at time t, and Target _{t- 1} represents a first target output which is a target output at a time t-1.

On the other hand, the target output calculating unit 450 sets the first power generation output to the second target power when it is determined that the difference between the first power generation output and the first target power is not greater than the lamp set. This can be expressed by the following equation (5).

In Equation (5), Target _t represents a second target output which is a target output at time _t , and WT _t represents a first generation output which is a generation output at time t.

A method of setting the second target output by the target output calculating unit 450 will be described with reference to FIG.

5, since the first power generation output, which is the power generation output at time t, is larger than the first target power, which is the target output at the time t-1, the target output calculator 450 calculates the target power (Ramp Set_1), which is a ramp set calculated at step t, to a second target output which is a target output at time t.

Since the second power generation output at the time t + 1 is not larger than the second target output, which is the target output at the time t, at the time t + 1, the target output calculating unit 450 outputs the lamp set at the time t + The resultant value obtained by subtracting the second ramp set Ramp Set_2 is calculated as the third target output which is the target output at the time point t + 1.

4, the setpoint calculation unit 460 multiplies the difference value between the first power generation output and the second target power by an output sharing ratio for each energy storage device 230 to calculate a charge / discharge instruction value (Reference ).

Specifically, when the resultant value obtained by multiplying the resultant value obtained by subtracting the first generation output from the second target output by the output sharing ratio is a positive value, the command value calculation section 460 calculates the resultant value as a discharge command value, If the result obtained by subtracting the first generation output from the output is multiplied by the output sharing ratio, and the result is negative, the result is calculated as the charge command value.

On the other hand, the setpoint calculation section 460 calculates the charge / discharge instruction value to be 0 when the second target output and the first generation output are the same, that is, when the first generation output is set as the second target output.

The command value calculation section 460 transmits the calculated charge / discharge command value to the power conversion device 234 so that the power conversion device 234 can control the charge / discharge of the battery control device 246 in accordance with the charge / discharge command value .

4, the controller 232 according to the present invention controls the SOC of the energy storage device 230, the charge / discharge set value of the energy storage device 230, and the actual output of the energy storage device 230 And an interface unit (not shown) for transmitting the generated power to the power management apparatus 220. The controller 232 receives the output sharing ratio for each energy storage device from the power management device 220 through the interface unit.

Referring again to FIG. 3, the power converter 234 serves to connect the battery controller 236 and the power system 270. More specifically, the power conversion apparatus 234 stores power in one or more battery rack groups 320 included in the battery control apparatus 236 according to the charge / discharge command transmitted from the controller 232, The power stored in the renewable energy source 320 is supplied to the power system 270 to regulate the output fluctuation rate of the renewable energy source 260 to be within the target fluctuation range.

The power converter 234 includes a switch gear (SWGR) 312, a transformer 314, and a power converter 316.

The switchgear 312 is responsible for interrupting power to the power system 270 and for inputting power supplied from the power system 270.

The transformer 314 takes charge of the step-up or step-down.

A power conversion unit (PCU) 316 is connected to the battery rack group 320 to convert the AC voltage of the power system 270 into a DC voltage or to convert the DC voltage of the battery rack group 320 into an AC voltage Conversion.

In one embodiment, when the battery conditioner 236 includes a plurality of battery rack groups 320, the power converter 234 includes a plurality of power converters 316 corresponding to each battery rack group 320 ). According to this embodiment, the power conversion unit 316 connected to each battery rack group 320 charges or discharges each battery rack group 320 according to the charge / discharge command value.

Next, the battery regulator 234 is configured with one or more battery racks (not shown) to store energy provided externally or to provide power to one or more battery racks in the event of a peak load or power system 270 event And provides the stored energy to the outside.

At this time, the battery rack may be included in the battery adjusting device 234 in the form of a battery rack group 320 in which a plurality of battery racks are connected in series or in parallel, or a plurality of battery rack groups 320 may be connected to each other May be included in the device 234.

Referring again to FIG. 2, the output variation rate control system 200 of a renewable energy source according to the present invention includes a second A / D converter 240, a gateway 242, an energy management device 250, and a hub 252 ).

The second A / D converter 240 converts the first output voltage and the first output current measured by the measuring device 210 into a digital form, and the gateway 242 converts the first output voltage and the first output current into a digital form, And transmits the first output voltage and the first output current, which have been converted into the digital form, to the power management apparatus 220.

In accordance with this embodiment, the power management device 220 uses the first output voltage and the first output current delivered from the gateway 242 to produce a first power generation output, and the first power generation output, The second target output is calculated using the first target output and the charge and discharge command value for each energy storage device 230 can be calculated using the difference value between the first and second target outputs and the output share ratio.

Thereafter, the power management device 220 can determine whether an error has occurred by comparing the charge / discharge command value for each energy storage device 230 directly calculated and the feedback charge / discharge command value from each energy storage device 230, An alarm is generated and output when an error occurs so that a system operator can check the state of the energy storage device 230.

The energy management device 250 monitors the operation state of the power system 270 to perform scheduling for power supply and monitors the operation state of the power management device 220 to control the power management device 220.

The hub 252 includes a connection between the gateway 242 and the power management device 220, a connection between the power management device 220 and the plurality of energy storage devices 230, a power management device 220 and the energy management device 250, .

As such, the present invention allows a plurality of energy storage devices 230 to directly receive the first output voltage and the first output current in analog form directly from the measuring device 210, and output the received first output voltage and the first output current It is possible to control the output fluctuation rate of the renewable energy source 260 in units of msec.

In addition, since the first output voltage and the first output current required for calculating the charge / discharge command value are directly supplied from the measuring device 210 in an analog form to the energy storage device 230, the power management device 220 The communication delay can be minimized as compared with the method of calculating the charge / discharge command value of each energy storage device 230 based on the first output voltage and the first output current and then transmitting the calculated charge / discharge set value to each energy storage device 230, The control error caused by the communication delay can also be reduced.

Meanwhile, in the above-described embodiment, the output variation rate control system 100 of the renewable energy source according to the present invention has been described as including a plurality of energy storage devices 230. However, in a modified embodiment, the output variation rate control system 200 of a renewable energy source according to the present invention may include one energy storage device 230.

According to this embodiment, since it is not necessary to calculate the output sharing ratio between the energy storage devices 230 according to the SOC of the energy storage device 230, the power management device 220 can calculate the output sharing ratio . In calculating the charge / discharge command value, the energy storage device 230 calculates the charge / discharge command value using only the difference value between the first power generation output and the second target power.

When the power generation output of the new and renewable energy source is stabilized by using the output variation rate control system 200 of the renewable energy source as described above, as shown in FIG. 6, It can be seen that the power generation output of the source is stabilized and the power generation output of the renewable energy source is stabilized within a quantitative value as shown in Fig.

In particular, FIG. 7 shows the result when the target fluctuation rate is 10%. As can be seen from the graph shown in FIG. 7, the maximum fluctuation rate is 9.8%, so that the fluctuation rate of the power generation output of the renewable energy source is the target fluctuation rate It can be seen that it is accurately controlled within 10%.

Hereinafter, a method for controlling the power variation of the renewable energy source according to the present invention will be described.

FIG. 8 is a flowchart illustrating a method of controlling an output variation rate of a renewable energy source according to an embodiment of the present invention. The output fluctuation rate control method of the renewable energy source shown in FIG. 8 can be performed by the output fluctuation rate control system of the renewable energy source having the configuration as shown in FIG.

As shown in Fig. 8, the power management apparatus receives SOC information from each energy storage device (S800). Thereafter, the power management apparatus calculates an output sharing ratio for each energy storage device according to the SOC of each energy storage device (S810). The method of calculating the output sharing ratio for each energy storage device by the power management apparatus has been described in detail with reference to Equation (1), and a detailed description thereof will be omitted.

Thereafter, the power management apparatus transfers the output sharing ratio for each energy storage device to each energy storage device (S820).

Thereafter, when the first output voltage and the first output current measured at time t are measured by the measuring device connected to the output terminal of the renewable energy source (S825), the energy storage device outputs the first output voltage and the first output The current is received in analog form (S830).

Thereafter, the energy storage device converts the analog first output voltage and the first output current into a digital first output voltage and a first output current (S840).

Thereafter, the energy storage device calculates a first power generation output at a time point t of the renewable energy source using the first output voltage and the first output current in digital form (S850).

Thereafter, the energy storage device calculates the difference between the first target output, which is the target output at the time t-1 of the first power generation output and the renewable energy source, and the result of the comparison of the lamp set, A second target output which is a target output is calculated (S860).

More specifically, the energy storage device adds the ramp set to the first target output if the difference between the first power output and the first target output is greater than the lamp set and the first power output is greater than the first target output And the resultant value is calculated as the second target output.

The energy storage device may also be configured to subtract the ramp set from the first target output if the difference between the first power output and the first target output is greater than the lamp set and the first power output is not greater than the first target output, 2 target output.

The energy storage device also produces a first power generation output to a second target power if the difference value between the first power generation output and the first target power is not greater than the lamp set.

Then, the energy storage device calculates the charge / discharge command value by multiplying the difference value between the first power generation output and the second target power by the output sharing ratio for each energy storage device (S870).

Specifically, the energy storage device calculates the charge / discharge command value by multiplying the subtraction result obtained by subtracting the first generation output at the second target output by the output sharing ratio for each energy storage device.

Accordingly, when the second target output is larger than the first generation output, the subtraction result value becomes a positive value, so that the energy storage device multiplies the difference value between the first power generation output and the second target output by the energy storage- And the resulting value is calculated as a discharge command value.

When the second target output is smaller than the first generation output, the subtraction result value becomes a negative value. Therefore, the energy storage device multiplies the difference value between the second target output and the first generation output by the output sharing ratio for each energy storage device Value is calculated as a charge command value.

Further, when the second target output and the first generation output are the same, that is, when the first generation output is set to the second target output, the energy storage device calculates the charge / discharge instruction value to be zero.

Thereafter, the energy storage device controls the operation of the energy storage device according to the charge / discharge command value calculated in S880 (S890).

That is, when the charge command value is calculated, the energy storage device charges the plurality of batteries with the energy corresponding to the charge command value to stabilize the power generation output of the renewable energy source. When the discharge command value is calculated, Thereby stabilizing the power generation output of the renewable energy source.

Also, when the energy storage device calculates 0 as the charge / discharge command value, it is determined that the power generation output of the renewable energy source is stabilized, and charging / discharging of the energy storage device is not performed.

The method for controlling the output variation ratio of the renewable energy source may be implemented in a program form that can be performed by using various computer means. The program for performing the output variation ratio control method of the renewable energy source may be a hard disk, Readable recording medium such as a CD-ROM, a DVD, a ROM, a RAM, or a flash memory.

Those skilled in the art will appreciate that the invention described above may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. 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.

200: Output change rate control system of new and renewable energy source 210: Measuring device
220: power management device 230: energy storage device
240: second A / D converter 242: gateway
250: Energy management device 252: Hub
260: New & renewable energy source 270: Power system
282: first hard wire wiring 284: second hard wire wiring

Claims (15)

a measuring device for measuring a first output voltage and a first output current of the renewable energy source at time t;
A plurality of energy storage devices for performing charge and discharge in accordance with the first output voltage and the first output current received from the measuring device so that an output variation rate of the renewable energy source is within a target variation rate; And
And a power management device for receiving the SOC information of each energy storage device from the plurality of energy storage devices and calculating an output sharing ratio for each of the plurality of energy storage devices according to the received SOC information,
Each of the energy storage devices includes:
A ramp set (Ramp Set), which is an output limit value for controlling the increase and decrease of the renewable energy source, a first set of power generation of the renewable energy source calculated using the first output voltage and the first output current, And a controller for calculating a charge / discharge command value for charging / discharging each of the energy storage devices at time t and performing charge / discharge in accordance with the charge / discharge command value using the output sharing ratio of the energy storage devices. Output variable rate control system. The method according to claim 1,
The controller comprising:
An operation unit for calculating the first power generation output using the first output voltage and the first output current;
And a second target output, which is a target output at a time point t of the renewable energy source, using a first target output, which is a target output at a t-1 time point of the first power generation output, the lamp set, A target output calculation unit for calculating a target output value; And
And a setpoint calculation unit for multiplying a difference value between the first power generation output and the second target power by an output sharing ratio of the plurality of energy storage devices to calculate a charge / discharge command value for charging / discharging each energy storage device The output variable rate control system of renewable energy sources. The method according to claim 1,
The power management apparatus includes:
A first output voltage, a first output current, and an actual output according to a charge / discharge instruction value of each energy storage device, from the plurality of energy storage devices, and outputs the first output voltage and the first output current based on Wherein the output sharing ratio of the plurality of energy storage devices is adjusted based on the SOC information of each energy storage device when the output command value of each energy storage device calculated as the difference Output variation rate control system. The method according to claim 1,
The power management apparatus includes:

Calculating a power share ratio of the plurality of energy storage devices using the energy storage device,
In the above equation

Represents the output sharing ratio of the n-th energy storage device,

And S denotes the SOC of the n-th energy storage device, and n denotes the number of energy storage devices. a measuring device for measuring a first output voltage and a first output current of the renewable energy source at time t; And
(Ramp Set), which is an output limit value for controlling the first power generation output of the renewable energy source and the second power renewal energy source, which are calculated using the first output voltage and the first output current received from the measuring device, And an energy storage device for performing a charge and discharge operation in accordance with the charge and discharge command value to adjust an output variation rate of the renewable energy source to be within a target variation rate, Control system for regulating the output power of renewable energy sources. 6. The method of claim 5,
The energy storage device includes:
An operation unit for calculating the first power generation output using the first output voltage and the first output current;
And a second target output, which is a target output at a time point t of the renewable energy source, using a first target output, which is a target output at a t-1 time point of the first power generation output, the lamp set, A target output calculation unit for calculating a target output value; And
And a setpoint value calculation unit for calculating the charge / discharge command value using a difference value between the first power generation output and the second target power. 7. The method according to claim 2 or 6,
The target output calculating unit
If the difference between the first power output and the first target output is greater than the lamp set, calculating a second target output at the time t by subtracting or adding the ramp set to the first target output,
And calculates the first power generation output as the second target power if the difference is not greater than the lamp set. 8. The method of claim 7,
The target output calculating unit calculates,
If the difference between the first power output and the first target output is greater than the lamp set and the first power output is greater than the first target output, A second target output is calculated,
If the difference between the first power output and the first target output is greater than the lamp set and the first power output is not greater than the first target output, And the second target output is calculated as the second target output. 6. The method according to claim 1 or 5,
The lamp set includes:
Equation

, ≪ / RTI >
Wherein Ramp Rate represents a target fluctuation rate of the renewable energy source output, Control Period represents an output control period of the renewable energy source, and n and and m represents a time correction coefficient determined according to a unit time of a target variation rate. 6. The method according to claim 1 or 5,
Further comprising a hard wire wiring for connecting the measuring device and the energy storage device to transmit and receive the first output voltage and the first output current in an analog form. 6. The method according to claim 1 or 5,
The measuring device includes:
A potential transformer connected to an output terminal of the renewable energy source to measure the first output voltage; And
And a current transformer connected to an output terminal of the renewable energy source and measuring the first output current. A method for controlling the output variation ratio of a renewable energy source using an output variation ratio control system of a renewable energy source composed of a power management device and a plurality of energy storage devices,
Calculating the output share ratio of the plurality of energy storage devices according to the SOC information of each energy storage device;
Each of the energy storage devices receiving a first output voltage and a first output current measured at time t from a measuring device connected to an output terminal of the renewable energy source;
And
Wherein each of the energy storage devices includes a first set of power generation outputs of the renewable energy source calculated using the first output voltage and a first output current, a lamp set which is an output limit value for controlling the increase / decrease ratio of the renewable energy source, And calculating a charge / discharge command value at a time point t of the energy storage device using an output sharing ratio of the plurality of energy storage devices. 13. The method of claim 12,
Wherein the step of calculating the charge /
Calculating the first power generation output using the first output voltage and the first output current;
The target output of the renewable energy source at the time t is calculated by using the difference between the first power generation output and the first target power, which is the target output of the renewable energy source at time t-1, A second target output; And
And calculating the charge / discharge command value by multiplying a difference value between the first power generation output and the second target power by an output sharing ratio for each energy storage device. 14. The method of claim 13,
In the step of calculating the second target output,
Sets the result of subtracting or adding the ramp set to the first target output to the second target output if the difference between the first power output and the first target output is greater than the lamp set, And if the difference between the first target output and the first target output is not greater than the lamp set, the first generator output is calculated as the second target output. 15. The method of claim 14,
In the step of calculating the target output,
If the difference between the first power output and the first target output is greater than the lamp set and the first power output is greater than the first target output, A second target output is calculated,
If the difference between the first power output and the first target output is greater than the lamp set and the first power output is not greater than the first target output, And the second target output is calculated as the second target output.

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