KR20160067581A - System and Method for Controlling Ramp Rate of New Renewable Generator - Google Patents

Abstract

The present invention relates to a system and a method for controlling an output change rate of a renewable generator, capable of stabilizing power of the renewable generator without a separate standby generator. The system for controlling the output change rate of the renewable generator comprises: a reference ramp set calculating unit; an upper/lower ramp set setting unit; and a target output calculating unit. The reference ramp set calculating unit calculates a reference ramp set which is an output limit value of the renewable generator by using a target change rate of the output of the renewable generator, and the rated output of the renewable generator. The upper/lower ramp set setting unit sets an upper ramp set which is an output limit value to control an evaporation rate of the renewable generator, and a lower ramp set, which is the output limit value to control a decreased evaporation rate, by using the reference ramp set and a state of charge (SOC) of an energy storage system (ESS). The target output calculating unit calculates a first output of the renewable generator at a t time point; a first target output which is a target output of the renewable generator at a t-1 time point; and a second target output which is the target output at the t time point to enable the output change rate of the renewable generator to be within the target change rate when a first result value calculated by consumption power of the ESS is bigger than the reference ramp set at the t time point.

Description

TECHNICAL FIELD [0001] The present invention relates to a system and a method for controlling the rate of change of a renewable generator,

More particularly, the present invention relates to a system and a method for controlling the rate of change of output of a new / renewable generator.

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.

Although investment in the expansion and dissemination of renewable energy such as wind power and photovoltaic power generation is concentrated worldwide, the development of new and renewable generators that use renewable energy sources such as wind power and solar power having intermittent power generation characteristics is difficult to predict The severe output fluctuation characteristic greatly affects the stable operation of the linkage system.

Particularly, the influence of the power generation of such a new generation generator is getting larger as the ratio of power generation by the renewable generator is increased.

Therefore, as shown in FIG. 1, a separate preliminary generator is provided for stabilizing the output of the new-renewable generator, and when the output fluctuation of the new-generation generator is maintained by keeping the preliminary generator always on, A method of stabilizing the total output through the generation of the generator was used.

However, in the case of the prior art shown in FIG. 1, since the spare generator must be kept in the on state at all times, energy is wasted, and as the ratio of the total amount of power generation of the new generator increases, 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 system and method for controlling the output fluctuation rate of a new and renewable generator that can stabilize the power generation output of a new and renewable generator even without a separate preliminary generator.

It is another object of the present invention to provide a system and method for controlling the output fluctuation rate of a new and renewable generator that can control the power generation output of a new and renewable generator within a target fluctuation rate while maintaining SOC of the energy storage device constant.

It is another object of the present invention to provide a system and method for controlling the output fluctuation rate of a new and renewable generator that can control the power generation output of a new and renewable generator within a target fluctuation rate while compensating power consumption of the energy storage device.

It is another object of the present invention to provide a system and method for controlling the output fluctuation rate of a renewable generator capable of maintaining the SOC of the energy storage device constant even when the generation output of the renewable generator does not deviate from the target fluctuation rate limit. .

According to an aspect of the present invention, there is provided a system for controlling the rate of change of output of a new-and-renewable generator. The system includes a variable regenerative- A reference lamp set calculation unit for calculating a reference lamp set Ramp Set, (SOC) of an energy storage system (ESS) and an upper limit lamp set as an output limit value for controlling the evaporation rate of the renewable generator using the reference lamp set and a lower limit An upper / lower limit lamp set setting unit for setting a lamp set; a first target output which is a target output of the renewable generator at a time point t-1, and a first target output which is a target output of the renewable generator at a time point t-1 and a first power output of the energy storage device at time t And a target output calculating unit for calculating a second target output that is a target output at the time point t when the result is a value larger than the reference lamp set so that an output fluctuation rate of the renewable generator becomes within the target fluctuation rate do.

(

는 t시점에서 신재생 발전기의 발전출력인 제1 발전출력이고, t-1시점에서

는 신재생 발전기의 타겟출력인 제1 타겟출력이며,

는 t시점에서 상기 에너지 저장장치의 소비전력임)를 연산한 제1 결과값을 상기 기준 램프 셋과 비교하는 단계; 상기 제1 결과값이 상기 기준 램프셋 보다 크면, 제1 발전출력에 상기 상한 램프 셋을 가산하거나 상기 하한 램프 셋을 감산하여 상기 t시점에서의 타겟출력인 제2 타겟출력을 산출하는 단계; 및 수학식

를 이용하여 산출되는 상기 t시점에서 에너지 저장장치의 충방전 지령치(

)에 따라 상기 에너지 저장 장치를 충방전 시키는 단계를 포함하는 것을 특징으로 한다.According to another aspect of the present invention, there is provided a method for controlling the rate of change of output of a new / renewable generator, comprising the steps of: Calculating a reference ramp set; Setting an upper limit ramp set as an output limit value for controlling the evaporation rate of the new and renewable generator and a lower limit ramp set as an output limit value for controlling the rate of decay using the SOC of the energy storage device and the reference ramp set; Equation

(

Is the first power generation output that is the power generation output of the new and renewable power generator at time t, and at the time t-1

Is a first target output which is a target output of the renewable generator,

Is the power consumption of the energy storage device at time t), and comparing the first result with the reference ramp set; Calculating a second target output that is a target output at the time t by adding the upper ramp set to the first power generation output or subtracting the lower ramp set if the first result value is greater than the reference ramp set; And Equation

The charge / discharge instruction value of the energy storage device at the time point t

And charging / discharging the energy storage device.

According to the present invention, there is no need of a separate preliminary generator for stabilizing the power generation output of the new-renewable generator, so that there is an effect that energy waste and economic loss caused by the operation and installation of the preliminary generator can be minimized.

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

In addition, according to the present invention, it is possible not only to maintain the SOC of the energy storage device constant when controlling the rate of change of the power generation output of the new and renewable generator, but also to improve the SOC of the energy storage device even when the power generation output of the new & The battery can be prevented from being overcharged or overdischarged, so that the life of the battery can be prolonged.

In addition, according to the present invention, there is an effect that the control accuracy can be improved by compensating for the error generated due to the power consumption of the energy storage device when controlling the power generation output of the new and renewable generator.

Further, according to the present invention, it is possible to control the fluctuation of the power generation output of the new and renewable generators within a quantitative numerical value range. Therefore, it is possible to control the power generation output of the new and renewable generators, It is possible to satisfy 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]
FIG. 3 conceptually illustrates a method of setting a target output of the target output calculator shown in FIG. 2 when the SOC of the energy storage device is smaller than a lower limit;
FIG. 4 conceptually illustrates a method of setting the target output of the target output calculator shown in FIG. 2 when the SOC of the energy storage device is larger than the upper limit;
FIG. 5 conceptually illustrates a method of setting a target output of the target output calculator shown in FIG. 2 when the SOC of the energy storage device is equal to or more than the lower limit and is equal to or less than the upper limit;
6A is a graph showing a result of controlling the power generation output of the new and renewable generator in consideration of the target fluctuation rate only when the SOC of the energy storage device is lower than the lower limit value.
FIG. 6B is a graph showing the result of controlling the power generation output of the new and renewable generator in consideration of the SOC and the target fluctuation rate of the energy storage device when the SOC of the energy storage device is smaller than the lower limit value.
FIG. 7A is a graph showing a result of controlling the power generation output of the new-generation generator in consideration of the target variation only when the SOC of the energy storage device is greater than the upper limit value.
FIG. 7B is a graph showing a result of controlling the power generation output of the new and renewable generator in consideration of both the SOC and the target variation of the energy storage device according to the present invention when the SOC of the energy storage device is greater than the upper limit value.
FIG. 8 is a flowchart illustrating a method of controlling the output fluctuation rate of the renewable generator 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.

In the following description, it is assumed that the renewable energy source is a wind power generation for convenience of explanation. However, the present invention can be applied to various kinds of renewable energy sources besides wind power generation.

FIG. 2 is a block diagram schematically showing a configuration of an output variation rate control system of a new and renewable generator according to an embodiment of the present invention.

2, the output variation rate control system 200 of the new and renewable generator according to an embodiment of the present invention includes an input unit 210, a reference lamp set calculation unit 220, an upper / A target power calculating unit 240, a power consumption measuring unit 245, a command value generating unit 250, and an energy storage system (ESS) 260.

First, the input unit 210 receives the target variation rate of the renewable generator power generation output from the system operator. Here, the target fluctuation rate (Ramp Rate) of the power generation output of the renewable generator means the power generation fluctuation rate limit value of the renewable generator during a predetermined unit time. In one embodiment, the predetermined unit time may be one minute.

In the above-described embodiment, although the target variation ratio is described as being input from the system operator, in a modified embodiment, the input unit 210 may automatically set the target variation ratio based on past data. For example, the input unit 210 may set a rate of change, which is matched with 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 rate of change.

Next, the reference lamp set calculation unit 220 calculates a reference lamp set (Ramp Set) for controlling the increase and decrease of the renewable generator. Here, the reference lamp set means a limit value of the power generation output of the new and renewable generator determined for each control cycle for controlling the increase and decrease of the renewable generator.

In one embodiment, the reference lamp set calculator 220 may calculate a reference lamp set using Equation 1 below.

In Equation (1), Ramp Set represents a reference ramp set, Rated Power represents a rated output of the renewable generator, Ramp Rate represents a target fluctuation rate of the renewable generator power output, and Control Period represents the output control cycle of the renewable generator , And n and m represent time correction coefficients that are 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. [

The upper and lower limit ramp set setting unit 230 sets the upper and lower limit ramp sets of the new and renewable generators 220 and 230 using the SOC (state of charge) of the energy storage unit 260 and the reference ramp set calculated by the reference lamp set calculation unit 220. [ Set the upper limit ramp set, which is the output limit value for evaporation rate control, and the lower limit ramp set, which is the output limit value for the rate control.

In one embodiment, the upper / lower limit ramp setter 230 determines the SOC of the energy storage device 260 at each point in time, and determines the SOC of the energy storage device 260 based on the range of the SOC of the energy storage device 260 Set or adjust the set to set the upper or lower lamp set.

Specifically, when the SOC of the energy storage device 260 is less than a predetermined lower limit at a time t, the upper / lower limit ramp setter 230 sets a value obtained by reducing the reference ramp set by 1 / N times to the upper limit lamp set , The reference ramp set is set to the lower ramp set.

Here, when the SOC of the energy storage device 260 is lower than the lower limit value at the time t, the upper / lower limit ramp setter 230 sets the value of the reference ramp set to 1 / N times the upper limit lamp set, And the upper limit lamp set, which is an output limit value for controlling the evaporation rate of the renewable generator, is reduced so that more power is charged in the energy storage device 260, thereby preventing over discharge of the battery.

If the SOC of the energy storage device 260 is greater than the predetermined upper limit value at the time t, the upper / lower limit lamp set setting unit 230 sets the reference lamp set as the upper limit lamp set and decreases the reference lamp set by 1 / N Set the value to the lower limit ramp set.

Here, when the SOC of the energy storage device 260 is greater than the upper limit value at the time t, the upper / lower limit ramp setter 230 sets the value obtained by reducing the reference ramp set by 1 / N times to the lower limit ramp set, The lower limit lamp set, which is an output limiting value for controlling the rate of the generator of the new generator, is discharged to discharge more power from the energy storage device 260, thereby preventing overcharging of the battery.

If the SOC of the energy storage device 260 is lower than the lower limit and lower than the upper limit, the upper / lower limit lamp set setting unit 230 sets the reference lamp set to the upper lamp set and the lower lamp set do.

Next, the target output calculating unit 240 calculates the target output of the new-and-renewable generator at the point in time using either the upper limit ramp set or the lower limit ramp set and the power generation output of the renewable generator at each time point.

Specifically, the target output calculating unit 240 calculates the target power of the first power generation output at time t, the first target output at the time t-1, which is immediately before the time t, and the first target output, 260) to the following equation (2) to calculate a first result value, and compares the first result value with a basic lamp set calculated by the basic lamp set calculation unit 220. [ Here, the power generation output means an output actually developed by the new and renewable generator at each time point, and the target output means the output of the new and renewable generator controlled according to the target change rate at each time point.

는 t시점에서 신재생 발전기의 발전출력인 제1 발전출력이고,

는 t-1시점에서 신재생 발전기의 타겟출력인 제1 타겟출력이며,

는 t시점에서 상기 에너지 저장장치의 소비전력을 나타낸다.In Equation 2,

Is a first power generation output that is the power generation output of the new and renewable generator at time t,

Is a first target output which is a target output of the new-renewable generator at time t-1,

Represents the power consumption of the energy storage device at time t.

If it is determined that the first resultant value is larger than the basic ramp set, the target output calculating unit 240 calculates the target output value at the time t by adding the upper limit ramp set to the first target output or subtracting the lower limit ramp set from the first target output. Which is a target output of the first target output.

To be more specific, the target output calculating unit 240 calculates a second resultant value that is a difference between the first power generation output and the power consumption of the energy storage device at the time t when the first resultant value is larger than the basic lamp set And compares the second result value with the first target output.

As a result of the comparison, if the second resultant value is larger than the first target output, the target output calculating section 240 calculates the second target output by adding the upper limit ramp set to the first target output. This can be expressed by the following equation (3).

As a result of the comparison, if the second result value is not larger than the first target output, the target output calculating unit 240 calculates the second target output by subtracting the lower limit ramp set from 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.

A method of setting the second target output by the target output calculating unit 240 will be described with reference to FIGS. 3 to 5. FIG.

3 is a diagram showing a method of setting a target output when the SOC of the energy storage device is smaller than a lower limit value. 3, since the SOC of the energy storage device is smaller than the lower limit at time t and time t + 1, the upper limit ramp set is set to a value reduced by 1 / N times the reference ramp set, .

As shown in FIG. 3, the target output calculator 240 sets the first target output at the time point t because the second resultant value at the time t is larger than the first target output, which is the target output at the time t-1 The resultant value obtained by adding the upper limit ramp set (Ramp Set _UP ) which is obtained by decreasing the reference ramp set by 1 / N times is set to the second target output which is the target output at time t.

Also, since the second output value at the time t + 1 is not larger than the second target output, which is the target output at the time t, the target output calculator 240 outputs the reference lamp set The Ramp Set _DOWN is set to the third target output, which is the target output at the time t + 1.

4 is a diagram illustrating a method for setting a target output when the SOC of the energy storage device is greater than an upper limit value. 4, since the SOC of the energy storage device is greater than the upper limit value at time t and time t + 1, the upper limit ramp set is set equal to the reference ramp set, and the lower limit ramp set is reduced by 1 / N Lt; / RTI >

4, since the second resultant value at the time t is not larger than the first target output which is the target output at the time t-1, the target output calculating unit 240 outputs the first target output at the time point t The resultant value obtained by subtracting the lower limit ramp set (Ramp Set _DOWN ) which is set by 1 / N times the set reference ramp set is set to the second target output which is the target output at time t.

In addition, the target output calculating section 240 calculates the target output value at the time t + 1 in the second target output because the second resultant value at the time t + 1 is larger than the second target output, which is the target output at the time t. (Ramp Set _UP ), which is the same as the first target output, is set as the third target output, which is the target output at the time t + 1.

5 is a diagram illustrating a method of setting a target output when the SOC of the energy storage device is equal to or greater than a lower limit and equal to or less than an upper limit; 5, since the SOC of the energy storage device is equal to or greater than the lower limit value and less than the upper limit value at the time t and the time t + 1, both the upper limit lamp set and the lower limit lamp set are set equal to the reference lamp set.

5, since the second resultant value at the time t is not greater than the first target output which is the target output at the time t-1, the target output calculating unit 240 outputs the first target output at the time point t And a resultant value obtained by subtracting a lower limit ramp set (Ramp Set _DOWN ) which is the same as the calculated reference ramp set is set as a second target output which is a target output at time t.

In addition, the target output calculating section 240 calculates the target output value at the time t + 1 in the second target output because the second resultant value at the time t + 1 is larger than the second target output, which is the target output at the time t. (Ramp Set _UP ), which is the same as the first target output, is set as the third target output, which is the target output at the time t + 1.

Meanwhile, when the first resultant value is not greater than the reference lamp set as a result of the comparison between the first resultant value and the reference ramp set, the target output calculating unit 240 determines that the SOC of the energy storage device 260 is less than the lower limit And if it exceeds the upper limit value, the power consumption at the time t of the first power generation output and the value obtained by subtracting the reference ramp set are calculated as the second target power. This can be expressed by the following equation (5).

When the SOC of the energy storage device 260 is equal to or greater than the lower limit value and equal to or less than the upper limit value at the time point t when the first result value is not greater than the reference lamp set, Compare the three further. As a result of the comparison, if the power consumption at the time t is not larger than the reference lamp set, the target output calculating section 240 calculates the first power generation output as the second target power. This can be expressed by the following equation (6).

If the first output value is not larger than the reference lamp set and the SOC of the energy storage device 260 is equal to or lower than the lower limit value at the time t and the power consumption at time t is lower than the reference lamp set A value obtained by subtracting the power consumption at time t from the result obtained by adding the first generation output and the reference ramp set is calculated as the second target output. This can be expressed by the following equation (7).

Referring again to FIG. 2, the power consumption measuring unit 245 measures the power consumption of the energy storage device 260 at predetermined time intervals. In one embodiment, the power consumption measuring unit 245 may be implemented using a watt-hour meter, or may be implemented using an ammeter and a voltmeter. The power consumption measuring unit 245 transmits the measured power consumption to the target output calculating unit 240. [

The command value generation unit 250 generates the command value of the energy storage device 260 based on the second target output calculated by the target output calculation unit 240, the power consumption of the energy storage device 260 at time t, Charge / discharge command value to be transmitted to the battery.

In one embodiment, the command value generator 250 calculates the difference between the second target output and the first generator output, and calculates the charge / discharge command value by summing the calculated difference value with the power consumption at the time t. This can be expressed by the following equation (8).

는 t시점에서의 충방전 지령치를 나타낸다.In Equation (8)

Indicates a charge / discharge command value at time t.

Specifically, when the third resultant value obtained by adding the second target output and the power consumption at the time t is greater than the first generation output, the calculation result of Equation (8) becomes a positive value, The operation result value of Equation (8) is generated as a discharge command value.

When the third resultant value is smaller than the first power generation output, the calculation result of Equation (8) becomes a negative value, so that the command value generator 250 generates the calculation result value of Equation (8) as a charge command value.

On the other hand, when the third resultant value obtained by summing the second target output and the power consumption at the time t is equal to the first generation output, the command value generator 250 determines the charge / discharge command value to be zero.

The command value generator 250 transmits the generated charge / discharge command value to the energy storage device 260.

The energy storage unit 260 includes a plurality of batteries. The energy storage unit 260 provides the SOC of the plurality of batteries included in each time point to the upper / lower limit lamp set setting unit 230.

In addition, the energy storage device 260 charges or discharges a plurality of batteries included therein according to the charge / discharge command value generated by the command value generator 250, thereby stabilizing the power generation output of the new / renewable generator.

That is, when the charge command value is transmitted by the command value generator 250, the energy storage device 260 charges the plurality of batteries with the energy corresponding to the charge command value. When the discharge command value is transmitted by the command value generator 250, The energy corresponding to the set value is discharged from the plurality of batteries to stabilize the power generation output of the new-generation generator.

Hereinafter, with reference to FIG. 6 and FIG. 7, the output variation rate control result of the renewable generator according to the present invention will be briefly described.

6A is a graph showing a result of controlling the power generation output of the new and renewable generator when the SOC of the energy storage device is lower than the lower limit. FIG. 6A is a graph showing a result of stabilizing the output of the new & FIG. 6B is a graph showing a result of stabilizing the output of the new-regenerative power generator in consideration of the SOC and target variation of the energy storage device according to the present invention.

In the case of FIG. 6A, the SOC of the energy storage device 260 continuously decreases due to the output of the irregular renewable generator, the charge / discharge efficiency of the energy storage device 260, and the natural discharge of the battery. Was reduced by more than 5% from the initial value of 50% to less than 45%.

On the other hand, in FIG. 6B, it can be seen that the SOC of the energy storage device 260 increases and converges to a constant value even after a lapse of time in the same environment as FIG. 6A.

7A is a graph showing a result of controlling the output fluctuation rate of the new regenerative power generator when the SOC of the energy storage device is greater than the upper limit value. FIG. 7A is a graph showing a result of stabilizing the output of the renewable & FIG. 7B is a graph showing a result of stabilizing the output of the new / renewable generator in consideration of the SOC and the target variation of the energy storage device according to the present invention.

In the case of FIG. 7A, since the energy storage device 260 maintains a high SOC for a long time due to insufficient reduction rate of the SOC over time of the energy storage device 260, when the output of the renewable generator 260 increases, 260 may be overcharged.

7B, the SOC of the energy storage device 260 rapidly decreases over time in the same environment as that of FIG. 7A, and the SOC of the energy storage device 260 converges to a constant value within a short period of time. Can be done.

In the above-described embodiment, the output variation rate control system of the new-generation generator is described as being implemented by a plurality of components that perform the respective functions. However, this is only one example, And may be implemented as a single component that can be integrated.

In this embodiment, the input unit 210, the reference ramp set calculator 220, the upper / lower limit ramp setter 230, the tar output calculator 240, And the power consumption measuring unit 245 may be included in the energy storage unit 260. The power consumption measuring unit 245 may be included in the power storage unit 260,

Hereinafter, a method of controlling the output fluctuation rate of the new-renewable generator according to the present invention will be described.

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

As shown in FIG. 8, the output variation rate control system of the new and renewable generator calculates a reference lamp set Ramp Set for controlling the increase and decrease of the renewable generator using Equation (1) (S800). As described above, the reference lamp set means a limit value of the power generation output of the new and renewable generator determined for each control cycle for controlling the increase and decrease of the renewable generator.

Next, the output fluctuation rate control system of the new-renewable generator calculates the first target output, which is the target output at the time point t-1, and the second target output, which is the energy at the time point t, according to the above- The first result value obtained by subtracting the power consumption of the storage device is calculated (S810), and the calculated difference value is compared with the reference lamp set calculated in S800 (S820).

If the first resultant value is larger than the reference lamp set as a result of the comparison at S820, the output fluctuation rate control system of the new and renewable generator compares the SOC (SOC _t ) of the energy storage device at a time _t with a predetermined upper limit value (S835) If the SOC (SOC _t ) of the energy storage device is greater than the upper limit value at time _t , the reference ramp set is reduced by 1 / N times to a lower ramp set (Ramp Set _DOWN ) (Ramp Set _UP ) (S840). Herein, the lower limit lamp set means the output limit value of the new regenerative power generator for controlling the deceleration rate of the renewable generator, and the upper limit lamp set means the output limit value of the renewable generator for controlling the evaporation rate of the renewable generator.

On the other hand, if it is determined in step S835 that the SOC (SOC _t ) of the energy storage device is not greater than the upper limit value at time t, the output variation rate control system of the new and renewable generator sets the SOC (SOC _t ) If the SOC (SOC _t ) of the energy storage device is less than the lower limit value at step S850, a value obtained by reducing the reference ramp set by 1 / N times is set as the upper limit ramp set, To a lower limit lamp set (S860).

If the SOC (SOC _t ) of the energy storage device is not less than the lower limit value at the time t as a result of the comparison at S850, the output variation rate control system of the renewable generator sets the same value as the upper limit lamp set and lower limit ramp set (S870).

Thereafter, the output variation rate control system of the new and renewable generator compares the second output value, which is the difference between the first power generation output and the power consumption of the energy storage device at time t, with the first target output (S880). As a result of the comparison, if the second result value is larger than the first target output, the output variation rate control system of the renewable generator calculates the result of adding the upper limit ramp set to the first target output to the second target output which is the target output at the time t (S890).

As a result of the comparison at S880, if the second result value is not larger than the first target output, the output variation rate control system of the new and renewable generator subtracts the lower limit ramp set from the first target output, (S900).

On the other hand, if it is determined in step S820 that the first resultant value is not greater than the reference ramp set, the output fluctuation rate control system of the new and renewable generator determines whether the SOC (SOC _t ) of the energy storage device is equal to or more than the lower limit value and less than the upper limit value (S910). As a result of the determination, if the SOC (SOC _t ) of the energy storage device is less than the lower limit value or exceeds the upper limit value at the time _t , the output change rate control system of the new and renewable generator subtracts the power consumption at the time t and the reference lamp set Value to the second target output (S920).

If it is determined in step S910 that the SOC (SOC _t ) of the energy storage device is lower than the lower limit and lower than the upper limit, the output variation rate control system of the new and renewable generator determines whether the power consumption at the time t is greater than the reference lamp set S930). As a result of the determination, if the power consumption at the time t is not larger than the reference lamp set, the output variation rate control system of the new and renewable generator calculates the first power generation output as the second target power (S940).

If it is determined in step S930 that the power consumption at the time t is greater than the reference lamp set, the output fluctuation rate control system of the new and renewable generator subtracts the power consumption at time t from the result obtained by adding the first power generation output and the reference lamp set Value to the second target output (S950).

When the second target output is calculated through the execution of S890, S900, S920, S940, and S950, the output fluctuation rate control system of the new and renewable generator uses the second target output, the power consumption at time t, And generates a charge / discharge instruction value of the energy storage device (S960).

In one embodiment, the output fluctuation rate control system of the new and renewable generator calculates a value obtained by subtracting the first generation output from a third result value obtained by adding the second target output and the power consumption at the time t according to Equation (8) Charge / discharge command value.

Specifically, when the third resultant value obtained by adding the second target output and the power consumption at the time point t is larger than the first power generation output, the calculation result of the expression (8) is positive The output fluctuation rate control system of the new and renewable generator generates the calculation result value of Equation (8) as a discharge command value.

When the third result value is smaller than the first generation output, the operation result of Equation (8) becomes a negative value, so that the output change rate control system of the new and renewable generator generates the operation result value of Equation (8) as the charge command value.

On the other hand, when the third output value obtained by summing the second target output and the power consumption at the time t is equal to the first generation output, the output fluctuation rate control system of the new and renewable generator determines the charge / discharge command value to be zero.

Thereafter, the output variation rate control system of the new and renewable generator controls the operation of the energy storage device in accordance with the charge / discharge command value generated in S960 (S970). That is, when the charge command value is generated, the output variation rate control system of the new and renewable generator charges the plurality of batteries with energy corresponding to the command value to stabilize the power generation output of the new and renewable generator.

In addition, when the discharge command value is generated, the output fluctuation rate control system of the new and renewable generator discharges energy corresponding to the command value from a plurality of batteries to stabilize the generation output of the new and renewable generator.

Also, when the output variation rate control system of the new / renewable generator is calculated as a charge / discharge command value of the energy storage device, it is determined that the power generation output of the new / renewable generator is in a stabilized state, and charging / discharging of the energy storage device is not performed.

The output variation rate control method of the above-described new and renewable generator may be implemented in a form of a program that can be executed using various computer means. The program for performing the output variation rate control method of the new- Readable recording medium such as a 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 the renewable generator 210:
220: reference lamp set calculation unit 230: upper / lower limit lamp set setting unit
240: target output calculating section 245: power consumption measuring section
250: setpoint generator 260: energy storage device

Claims (15)

A reference lamp set calculation unit for calculating a reference lamp set (Ramp Set), which is a power generation output limit value of the new and renewable generator, using the target variation rate of the power generation output of the new and renewable generator and the rated output of the new &
(SOC) of an energy storage system (ESS) and an upper limit lamp set as an output limit value for controlling the evaporation rate of the renewable generator using the reference lamp set and a lower limit An upper / lower limit lamp set setting unit for setting a lamp set; And
a first target output which is a target output of the renewable generator at a time point t-1, and a first target output which is a target output of the renewable generator at a time point t-1 and a first power output of the energy storage device at time t And a target output calculating unit for calculating a second target output that is a target output at the time point t when the result is a value larger than the reference lamp set so that an output fluctuation rate of the renewable generator becomes within the target fluctuation rate Control system of power regeneration of renewable generator. The method according to claim 1,
The target output calculating unit calculates,
Comparing the first generated output and a second result that is a difference between the power consumption of the energy storage device at the time point t and the first target output,
If the second result value is greater than the first target output, calculating a result value obtained by adding the upper limit ramp set to the first target output to the second target output, and if the second result value is greater than the first target output The second target output is a result obtained by subtracting the lower limit ramp set from the first target output. The method according to claim 1,
If the third resultant value obtained by adding the second target output and the power consumption of the energy storage device at the time point t is smaller than the first generation output, charges corresponding to the charge / discharge instruction value are charged in the battery, Discharging command value is discharged from the battery when the third resultant value is greater than the first target output so that the first power generation output is the second target output; Wherein the control unit is further operable to control the output fluctuation rate of the renewable generator. The method according to claim 1,
Wherein when the first resultant value is not greater than the reference lamp set,
When the SOC of the energy storage device is equal to or greater than a lower limit value and less than an upper limit value at the time point t, if the power consumption of the energy storage device at the time t is greater than the reference lamp set, Wherein the power consumption of the energy storage device at the time t is calculated by subtracting the power consumption of the energy storage device at the time t from the value of the first target output, Calculates a power generation output as the second target output,
If the SOC of the energy storage device is less than a lower limit value or exceeds an upper limit value at the time point t, a value obtained by subtracting the power consumption of the energy storage device at the time point t and the reference ramp set from the first power generation output, And the output variation rate control system of the new and renewable generator. The method according to claim 1,
The reference lamp set calculator calculates,
Equation

(Wherein the rated power is a rated output of the renewable generator, the ramp rate is the target fluctuation rate, the control period is a power generation output control period of the renewable generator, and n and m are a time correction coefficient Wherein the reference lamp set is calculated using the reference lamp set. The method according to claim 1,
Wherein the upper / lower limit lamp set setting unit comprises:
If the SOC of the energy storage device is less than a predetermined lower limit, the reference lamp set is set to the upper limit ramp set and the reference ramp set is set to the lower limit ramp set,
If the SOC of the energy storage device is greater than a predetermined upper limit value, the reference ramp set is set to the upper limit ramp set and the reference ramp set is set to the lower limit ramp set by 1 / N times,
Wherein the reference lamp set is set to the upper limit ramp set and the lower limit ramp set when the SOC of the energy storage device is equal to or higher than the lower limit value and lower than the upper limit value at the time point t. Calculating a reference lamp set which is a power generation output limit value of the new and renewable generator using the target variation rate of the power generation output of the new and renewable generator and the rated output of the new and renewable generator;
Setting an upper limit ramp set as an output limit value for controlling the evaporation rate of the new and renewable generator and a lower limit ramp set as an output limit value for controlling the rate of decay using the SOC of the energy storage device and the reference ramp set;
Equation

(

Is a first power generation output that is the power generation output of the new and renewable generator at time t,

Is a first target output which is a target output of the renewable generator at time t-1,

Is the power consumption of the energy storage device at time t), and comparing the first result with the reference ramp set;
Calculating a second target output that is a target output at the time t by adding the upper ramp set to the first power generation output or subtracting the lower ramp set if the first result value is greater than the reference ramp set; And
Equation

The charge / discharge instruction value of the energy storage device at the time point t

And a step of charging / discharging the energy storage device according to the control signal. 8. The method of claim 7,
In the setting step,
If the SOC of the energy storage device is less than a predetermined lower limit, the reference lamp set is set to the upper limit ramp set and the reference ramp set is set to the lower limit ramp set,
If the SOC of the energy storage device is greater than a predetermined upper limit value, the reference ramp set is set to the upper limit ramp set and the reference ramp set is set to the lower limit ramp set by 1 / N times,
Wherein the reference ramp set is set to the upper limit ramp set and the lower limit ramp set when the SOC of the energy storage device is equal to or greater than the lower limit and less than the upper limit. 8. The method of claim 7,
In the step of calculating the second target output,
If the first resultant value is greater than the reference lamp set and the second resultant value being a difference between the first power generation output and the power consumption of the energy storage device at the time t is greater than the first target power, And calculating a result of adding the upper limit ramp set to an output as the second target output. 8. The method of claim 7,
In the step of calculating the second target output,
When the first resultant value is greater than the reference lamp set and the second resultant value being a difference between the first power generation output and the power consumption of the energy storage device at the time t is not greater than the first target power, Wherein the second target output is obtained by subtracting the lower limit ramp set from the target output. 8. The method of claim 7,
In the step of calculating the second target output,
When the SOC of the energy storage device is less than a lower limit value or exceeds an upper limit value at the time point t, the power consumption of the energy storage device at the time t is shorter than the reference lamp And the second target output is a value obtained by subtracting the power consumption of the energy storage device at the time t from a result obtained by adding the first generation output and the reference ramp set to the second target output, A method for controlling the output fluctuation rate of a generator. 8. The method of claim 7,
In the step of calculating the second target output,
When the SOC of the energy storage device is less than a lower limit value or exceeds an upper limit value at the time point t, the power consumption of the energy storage device at the time t is shorter than the reference lamp And if it is not greater than three, the first generation output is calculated as the second target output. 8. The method of claim 7,
In the step of calculating the second target output,
The power consumption of the energy storage device at the time point t in the first generation output and the power consumption of the energy storage device at the time t when the SOC of the energy storage device is lower than the lower limit value and lower than the upper limit value, And a value obtained by subtracting the reference ramp set is calculated as the second target output. 8. The method of claim 7,
In the charging / discharging step,
If the third resultant value obtained by summing the second target output and the power consumption of the energy storage device at the time point t is smaller than the first generation output, charges corresponding to the charge / discharge instruction value are charged in the battery, Discharging command value is discharged from the battery if the third resultant value is greater than the first target output so that the first generation output is controlled to be the second target output, And a control unit for controlling the output fluctuation rate of the generator. 8. The method of claim 7,
In the step of calculating the reference ramp set,
Equation

(Wherein the rated power is a rated output of the renewable generator, the ramp rate is the target fluctuation rate, the control period is a power generation output control period of the renewable generator, and n and m are a time correction coefficient Wherein the reference lamp set is calculated using the reference lamp set.

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