KR102192684B1 - Electric power system contol device according to output fluctuation of renewable energy source and electric power system contol method using the same - Google Patents

Abstract

The power system control method according to the output fluctuation of the renewable energy source according to the present invention is a method of controlling the power system according to the output fluctuation of the renewable energy source linked to the power system. Calculating the output variability of the energy source, estimating the amount of responsiveness of the power system using the variability of the output of the renewable energy source and the generator capacity of the power system, and of the power system based on the responsiveness of the power system. And controlling the power supply resource.

Description

Power system control device according to output fluctuation of renewable energy source and power system control method using it {ELECTRIC POWER SYSTEM CONTOL DEVICE ACCORDING TO OUTPUT FLUCTUATION OF RENEWABLE ENERGY SOURCE AND ELECTRIC POWER SYSTEM CONTOL METHOD USING THE SAME}

The present invention relates to a power system control apparatus and a power system control method using the same according to the output fluctuation of a renewable energy source.

Due to the depletion of fossil fuels and energy shortages, the share of renewable energy sources is steadily increasing worldwide. Korea is also planning to increase the number of new and renewable energy sources through the power supply and demand plan, and in particular, is promoting the new and renewable energy 3020 policy, which increases the ratio of renewable energy sources by 20% by 2030.

And, the current renewable energy sources are growing around wind energy and solar energy. In Korea, a plan to increase renewable energy sources to 58.6GW by 2031 is in progress.

However, since the renewable energy source consists of energy sources whose output of the generator is determined according to climate and weather, it is difficult to control the output of the power generation sources, and an imbalance in power supply and demand is caused due to output fluctuations that occur instantaneously.

In addition, the power generation characteristics of the new and renewable energy source are different from those of the existing generators, causing the system to reduce inertial energy and responsive resources. Since the renewable energy source is not synchronous to the power system, it replaces the existing power generation source and reduces the inertia of the system when it is put into the system. Therefore, the frequency change due to the power supply and demand imbalance in the system appears more significant. In this situation, the domestic power system has the characteristics of an electric island because it is difficult to connect the grid with other countries, and the proportion of nuclear power generation that does not operate according to frequency is high, which is disadvantageous in terms of maintaining frequency stability.

Due to the characteristics of the domestic power system, the problem of output variability of new and renewable energy sources will appear even greater. Therefore, measures for the stability of power supply and demand in future power systems are urgently needed.

The matters described in this background are prepared to enhance an understanding of the background of the invention, and may include matters not known in the prior art to those of ordinary skill in the field to which this technology belongs.

The present invention proposes a power system control device and a power system control method capable of solving the power supply and demand imbalance problem due to the output variability of a renewable energy source and minimizing the frequency change of the power system due to the output variability of a renewable energy source. I want to.

The power system control method according to the output variation of the renewable energy source of the present invention is a method of controlling the power system according to the output variation of the renewable energy source linked to the power system, and the renewable energy according to the output amount of the renewable energy source Calculating the output variability of the source, estimating the amount of responsiveness of the power system using the variability of the output of the renewable energy source and the generator capacity of the power system, and the power of the power system based on the responsiveness of the power system And controlling the supply resource.

The step of estimating the amount of response of the power system includes calculating a frequency characteristic constant of the power system using power system data, and determining the amount of response according to the output variability of the renewable energy source based on the frequency characteristic constant. It may include steps.

The frequency characteristic constant of the power system may include a generator constant of an individual generator that determines a ratio of adjusting the output of the individual generator according to the frequency change.

The step of estimating the response amount of the power system includes calculating the response amount of each individual generator using the capacity of the individual generator and the generator constant set for the individual generator, and summing the response amount of the individual generators linked to the power system. It may include the step of calculating the total applied amount of the power system.

The frequency characteristic constant of the power system includes a generator constant of the power system that determines a ratio of adjusting the output of the generators connected to the power system based on a change in the frequency of the power system, wherein the ratio is all The same can be applied to generators.

The step of estimating the amount of response of the power system may include calculating a total amount of response of the power system based on the total amount of generation of generators connected to the power system and the constant of the power system.

The step of estimating the amount of responsiveness of the power system may include calculating an amount of additional power required for the power system according to short-term output fluctuations of a new and renewable energy source, and subtracting the predicted amount of responsiveness from the additional power amount to determine the generator capacity or BESS (Battery Energy Storage System) may include the step of calculating the capacity.

In the calculating of the BESS capacity, when the predicted response amount is greater than the reserve power amount of the power system, the predicted response amount may be limited to the reserve power amount.

The calculating of the BESS capacity may include determining an equivalent BESS capacity having the same or similar frequency characteristics as when the generator capacity is put into the power system.

The controlling of the power supply resource of the power system may include controlling the operation of the BESS linked to the power system based on the BESS capacity.

Controlling the operation of the BESS may include controlling on/off of a plurality of BESSs linked to the power system.

The power system control apparatus according to the output fluctuation of the renewable energy source of the present invention includes an responsive amount predictor for predicting the responsive amount of the power system according to the variability in the output of the renewable energy source linked to the power system, and the response of the power system. It includes an operation control unit that controls the generator or BESS (Battery Energy Storage System) connected to the power system based on the same amount.

The renewable energy source may include at least one of a wind generator, a solar generator, a geothermal generator, a fuel cell, bio energy, and marine energy.

The response amount prediction unit calculates the response amount of each individual generator using the capacity of the individual generator and the generator constant set for the individual generator, and adds the response amount of individual generators connected to the power system to the total response amount of the power system. Can be calculated.

The response amount prediction unit may calculate the total amount of response of the power system based on the total generation amount of the generators connected to the power system and the generator constants of the power system that are equally applied to all the generators connected to the power system.

The response amount predicting unit may include a BESS capacity determining unit that determines a BESS capacity to respond to a change in output of the renewable energy source.

The response amount prediction unit calculates the amount of additional power required for the power system according to the short-term output fluctuations of the renewable energy source, and subtracts the predicted amount of response from the additional power amount to determine the generator capacity or the battery energy storage system (BESS) capacity. However, if the predicted response amount is greater than the reserve amount of the power system, the predicted response amount may be limited to the reserve amount.

The operation control unit includes a BESS control unit that controls the operation of the BESS linked to the power system based on the BESS capacity, and the BESS control unit can control on/off of a plurality of BESSs linked to the power system. have.

According to the present invention, by calculating the response amount of the power system according to the output variation of the renewable energy source linked to the power system, and controlling the power supply resource of the power system based on the response amount, the output of the renewable energy source It solves the problem of unbalanced power supply and demand due to volatility, and provides an environment in which the frequency of the power system can be stably maintained.

In addition, the present invention calculates the frequency characteristic constant of the power system, and calculates the BESS (Battery Energy Storage System) capacity based on the frequency characteristic constant, thereby efficiently operating the power supply resource of the power system and thus the output volatility of the renewable energy source. It provides an environment that can minimize the frequency change of the power system.

In addition, the present invention calculates the amount of additional power required for the power system according to the short-term output fluctuation of the renewable energy source, and calculates the generator capacity or the BESS capacity by subtracting the response amount from the additional power amount, but the predicted response amount of the power system If it is greater than the reserve power, the predicted response amount is limited to the reserve power amount, thereby effectively providing the power required for the power system according to the output fluctuation of the renewable energy source, providing an environment that can solve the power supply and demand imbalance problem in the power system. do.

In addition, the present invention provides an environment capable of effectively coping with instantaneous output fluctuations of a renewable energy source by predicting output fluctuations of a renewable energy source and controlling BESS based on the predicted output fluctuations.

In addition, the present invention determines the equivalent BESS capacity having the same characteristics as the input of a flexible generator, and controls the operation of the BESS linked to the power system based on the BESS capacity when it is difficult to input additional generators to the power system, It provides an environment that can minimize the frequency change of the power system due to the instantaneous output fluctuation of a renewable energy source.

1 is a schematic diagram of a power system control system according to an embodiment of the present invention.
2 is a block diagram of an apparatus for controlling a power system according to an embodiment of the present invention.
3 is a flowchart schematically illustrating a process of controlling a power supply resource of a power system in consideration of a change in output of renewable energy by the power system control apparatus according to an embodiment of the present invention.
4 is a graph showing a change in frequency when a generator is input due to fluctuations in output of a renewable energy source according to an embodiment of the present invention.
5 is a graph showing a frequency change during BESS control due to the occurrence of output variability of a renewable energy source according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the embodiments of the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated. In addition, terms such as "... unit", "... group", and "module" described in the specification mean units that process at least one function or operation, which can be implemented by hardware or software or a combination of hardware and software. have.

In this specification, the power system or system refers to electrical equipment physically interconnected to supply electricity produced by a power plant to an electric user, that is, a power generation facility, a transmission and substation facility, a distribution facility, and other auxiliary facilities.

Now, a power system control device and a power system control method according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

1 is a schematic diagram of a power system control system according to an embodiment of the present invention, and FIG. 2 is a block diagram of a power system control apparatus according to an embodiment of the present invention. At this time, the power system control apparatus 100 only shows a schematic configuration necessary for explanation according to an embodiment of the present invention, but is not limited to this configuration.

Referring to FIGS. 1 and 2, the power system control apparatus 100 according to an embodiment of the present invention includes a data collection unit 110, a response amount prediction unit 120, and a driving control unit 130.

The data collection unit 110 collects power system information and output data of a renewable energy source 40 to be linked to the power system 10 or to be linked to the power system 10, and Predict output variability. Here, the power system information includes various generator information connected to the power system 10, bus information, transformer information, power generation data, transmission and substation data, load data, and the like. And, the renewable energy source 40 includes at least one of a wind generator, a solar generator, a geothermal generator, a fuel cell, bio energy, and marine energy.

The data collection unit 110 is the data of the generator 20, the battery energy storage system (BESS) 30, the renewable energy source 40, and the load 50 connected to the power system 10 as shown in FIG. To collect. The BESS 30 serves to charge the power generated by the generator 20 or the renewable energy source 40 and supply it to the load 50.

In addition, the data collection unit 110 includes a new and renewable output fluctuation prediction unit 112 according to an embodiment of the present invention.

The new and renewable output fluctuation predictor 112 predicts the fluctuation of the output of the renewable energy source 40 based on the collected power system information. For example, the new and renewable output fluctuation predictor 112 may predict the amount of change or output fluctuation of the renewable energy source 40 for each season or time.

The output and output variability of the renewable energy source 40 is determined by the climate and weather of the region where the renewable energy source is disposed, such as air volume, solar radiation, and temperature.

For example, the output of a wind power generator is determined by the wind speed and air density in the area, and among them, the output is largely influenced by the wind speed. The calculation formula for the output of the wind generator is shown in Equation 1 below.

Here, C _P is the ratio at which wind energy is converted into electric energy (Power Coefficient), and ρ is the air density. In addition, A is the area where the blades of the wind turbine rotate, and V _i is the wind speed in the i-th area. In addition, P _i ^a is a correlation coefficient for taking into account the tower height of the wind power generator, and N _i is the number of wind power generators in the i-th area.

In addition, the output of the solar generator is determined by the amount of insolation on the surface of the solar module, the surface temperature, and the like, and the amount of insolation from the solar module has a great influence on the output of the solar generator. The output of the solar generator can be approximated as in Equation 2 below.

Here, I is the output current of the solar module, V is the output voltage of the solar module, I _L is the photocurrent, and I _O is the diode saturation current. In addition, R _S is the solar cell internal series resistance, and R _sh is the solar cell internal parallel resistance. In addition, a is a diode ideal constant, V _T is a column potential difference, and k is a Boltzmann constant.

In this way, since the renewable energy source 40 such as wind or solar power is determined by external factors such as air volume, solar radiation, and temperature, the new and renewable output fluctuation predictor 112 is a new and renewable energy source 40 By comprehensively considering external factors affecting the output of and past output data of the renewable energy source 40, it is possible to predict the variability of the output of the renewable energy source 40 by season or time.

The response amount prediction unit 120 predicts the response amount of the power system using the output variability of the renewable energy source 40 and the generator capacity of the power system 10. Here, the amount of responsiveness of the power system includes an additional amount of output that generators need to generate additionally in order to respond to fluctuations in the output of a renewable energy source linked to the power system.

The response amount predicting unit 120 calculates a frequency characteristic constant of the power system using the power system data, and determines a response amount according to the output variation of the renewable energy source based on the frequency characteristic constant.

The response amount prediction unit 120 calculates the amount of additional power required for the power system according to the short-term output fluctuation of the renewable energy source 40, and calculates the generator capacity or the BESS capacity by subtracting the amount of response from the additional power amount. In this case, when the predicted response amount is greater than the reserve force amount of the power system, the predicted response amount may be limited to the reserve force amount.

In addition, the response amount prediction unit 120 includes a frequency characteristic constant analysis unit 122, a frequency analysis unit 124, and a BESS capacity determination unit 126 according to an embodiment of the present invention.

The frequency characteristic constant analysis unit 122 calculates frequency characteristic information based on power system data, output variation data of the new and renewable energy source 40 and output variation prediction data of the new and renewable energy source 40. Here, the frequency characteristic constant of the power system includes a generator constant and an inertia constant.

The generator constant is a value that determines the rate of adjusting the output of the generator according to the frequency change, and is the reciprocal of the speed adjustment rate (Droop constant). The generator constant includes the generator constant of the individual generator and the generator constant of the power system. Here, the generator constant of the individual generator includes a value that determines the ratio of adjusting the output of the individual generator according to the frequency change.

Accordingly, the response amount prediction unit 120 calculates the response amount of each individual generator using the capacity of the individual generator and the generator constant set for the individual generator, and adds the response amount of the individual generators connected to the power system to calculate the power system. The total amount of response can be calculated. In this case, the response amount predicting unit 120 has an effect of securing the reliability of the calculation of the total amount of response of the power system as the reliability of the generator constant of the individual generator is higher.

And, the generator constant of the power system includes a value that determines the ratio of adjusting the output of the generators connected to the power system based on the frequency change of the power system, and the ratio is the same for all generators connected to the power system. Can be applied. In addition, the generator constant of the power system may be calculated as the sum of the generator constants of the generators participating in the frequency response by input of the system.

Accordingly, the response amount prediction unit 120 may calculate the total amount of response of the power system based on the total amount of power generation of the generators connected to the power system and the generator constant of the power system. In this case, since the response amount prediction unit 120 calculates the total response amount based on the past response amount performance data, the total response amount of the power system is not obtained without obtaining the generator constant of each generator or calculating the response amount of each generator. There is an effect that can be easily calculated.

The generator 20 adjusts its output in response to a change in frequency caused by an imbalance in power supply and demand, and the output of the adjusted generator 20 is proportional to the frequency. In addition, in response to a frequency change, the governors of the generators detect a change in rotation speed and open an input valve of a prime mover (turbine) to increase water or steam in order to prevent a large drop in frequency. The concept that expresses the frequency characteristics of these governors as integers is the generator constant.

The generator constant (K _G ) is defined as the amount of change in the amount of generator output according to the amount of change in frequency, and is shown in Equation 3 below.

R is the generator's speed adjustment rate (droop), ΔP represents the generator's output change, and Δw represents the amount of frequency change.

The inertia constant represents a value obtained by standardizing the energy possessed by the generator 20 as a rated capacity when the generator 20 rotates at a synchronous speed.

Equation 4 below represents the inertia constant of the generator. The generator's inertia constant H is a value obtained by standardizing the energy of the generator with the rated capacity when the generator rotates at synchronous speed.

Here, J is the rotation momentum, w is the synchronous rotation speed, and S is the rated capacity of the generator. The domestic synchronous rotation speed is 60Hz.

Equation 5 below represents the inertia constant of the system when a plurality of generators 20 are input to the system.

The frequency analysis unit 124 performs a frequency simulation of the power system 10 according to a change in the output of the renewable energy source 40 based on frequency characteristic constants such as a generator constant and an inertia constant.

The frequency analysis unit 124 performs frequency analysis of the power system 10 according to the change in the ratio of the renewable energy source 40 or analyzes the frequency of the power system 10 according to the change in the output of the renewable energy source 40 Conduct.

For example, when the ratio of the renewable energy source 40 changes, the frequency analysis unit 124 may analyze a change in system characteristics by calculating an inertia constant representing a system inertial energy and a frequency following state and a generator constant. . In addition, the frequency analysis unit 124 analyzes how the frequency change changes according to the ratio of the renewable energy source 40 when the output fluctuation of the renewable energy source 40 of the same size in the power system 10 occurs. I can.

And, the change in the rotational speed (ω _s ) of the synchronizer is calculated through the fluctuation equation shown in Equation 6 below.

Where T _a is the acceleration torque, T _m is the mechanical torque, and T _e is the electrical torque.

And, the frequency change (Δω) of the system can be derived through Equation 7 below.

Here, ΔP _L means a change in the amount of load used in real time, and ΔP _(w) means a load that changes in proportion to the load constant D due to a frequency change, like a motor load. ΔPe means the total load change of the power system 10 including ΔP _L and ΔP _(w) .

The modeling of the BESS (30) was modeled in the form of a first-order LPF. The BESS 30 can quickly provide the power charged in the BESS 30 to the system in response to a change in power supply or demand or a change in frequency of the power system 10.

The BESS capacity determination unit 126 determines a BESS capacity to respond to fluctuations in the output of the renewable energy source 40.

The BESS capacity determination unit 126 calculates the BESS capacity having the same effect as the flexible generator being input to the power system. That is, the BESS capacity determination unit 126 may determine an equivalent BESS capacity having the same or similar frequency characteristics as when the generator capacity is put into the power system 10.

For example, when it is difficult to input an additional generator into the power system 10 in order to respond to a change in the output of the renewable energy source 40, the BESS capacity determination unit 126 may input the generator 20 into the power system. An equivalent BESS capacity with the same frequency characteristics can be determined.

The operation control unit 130 controls the generator 20 or the BESS 30 connected to the power system 10 based on the response amount of the power system 10 calculated by the response amount prediction unit 120. In addition, the driving control unit 130 includes a power supply resource determination unit 132 and a BESS control unit 134 according to an embodiment of the present invention.

The power supply resource determination unit 132 determines a power supply resource to provide the calculated response amount to the power system 10 in order to prepare for fluctuations in the output of the renewable energy source 40. Here, the power supply resource includes a generator connected to the power system 10 or a BESS connected to the power system 10.

For example, the power supply resource determination unit 132 provides power in preparation for fluctuations in the output of a renewable energy source among a plurality of generators connected to the power system 10 or a plurality of BESSs connected to the power system 10. It is possible to determine the power supply resources that can provide the grid 10 with additional generating capacity or responsiveness.

The BESS control unit 134 controls the operation of the BESS 30 linked to the power system 10 based on the BESS capacity. The BESS control unit 134 may control on/off of a plurality of BESSs linked to the power system 10. In addition, the BESS control unit 134 may determine the BESS 30 to provide additional generation capacity to the power system 10 in consideration of the SOC of the BESS 30, and control the operation of the determined BESS 30.

3 is a flowchart schematically illustrating a process of controlling a power supply resource of a power system in consideration of a change in output of renewable energy by the power system control apparatus according to an embodiment of the present invention. In this case, the following flowchart will be described using the same reference numerals in connection with the configurations of FIGS. 1 to 2.

Referring to FIG. 3, the power system control apparatus 100 according to an embodiment of the present invention collects power system information and output data of a renewable energy source 40 linked to the power system 10 (S102). . Here, the power system information includes various generator information connected to the power system 10, bus information, transformer information, power generation data, transmission and substation data, load data, and the like. And, the renewable energy source 40 includes at least one of a wind generator, a solar generator, a geothermal generator, a fuel cell, bio energy, and marine energy.

In addition, the power system control device 100 monitors the output variation of the renewable energy source 40, and predicts the future output variation of the renewable energy source 40 (S104).

Then, the power system control device 100 calculates a frequency characteristic constant of the power system 10 according to the output variability of the renewable energy source 40 (S106). Here, the frequency characteristic constant includes a generator constant that determines the ratio of adjusting the output of the generator according to the frequency change, and an inertia constant representing a value obtained by standardizing the energy possessed by the generator as a rated capacity when the generator rotates at a synchronous speed. .

The power system control device 100 performs a frequency analysis through frequency simulation using the frequency characteristic constant, calculates the amount of response of the power system 10 to prepare for fluctuations in the output of the renewable energy source 40, BESS capacity is calculated (S108, S110).

For example, the power system control device 100 calculates the response amount of each individual generator using the capacity of the individual generator and the generator constant set for the individual generator, and adds the response amount of the individual generators linked to the power system. The total amount of response of the power system can be calculated. In addition, the power system control apparatus 100 may calculate the total amount of response of the power system based on the total amount of power generation of the generators connected to the power system and the generator constant of the power system.

Then, the power system control device 100 calculates the amount of additional power required for the power system according to the short-term output fluctuation of the renewable energy source, and calculates the generator capacity or the BESS capacity by subtracting the predicted response amount from the additional power amount. . In this case, when the predicted response amount is greater than the reserve force amount of the power system, the predicted response amount may be limited to the reserve force amount.

For example, if the amount of additional power required for the power system is calculated as 100 MW according to the short-term output fluctuation of the renewable energy source, and the response amount is estimated as 50 MW, the BESS capacity may be calculated as 50 MW. However, when the amount of reserve power of the power system is 30MW, since the amount of response is larger than the amount of reserve power, the amount of response is limited to 30MW, which is the reserve amount, and the BESS capacity can be calculated as 70MW.

At this time, the power system control device 100 is an equivalent BESS capacity having the same frequency characteristics as the power system input of the generator 20 when it is difficult to input an additional generator to respond to the output fluctuation of the renewable energy source 40 Can also be calculated.

Then, the power system control device 100 controls the power supply resource of the power system 10 based on the amount of response (S112). For example, the power system control apparatus 100 may control the on/off operation of the BESS 30 linked to the power system 10 based on the BESS capacity.

4 is a graph showing a change in frequency when a generator is input due to fluctuation in output of a renewable energy source according to an embodiment of the present invention.

Referring to FIG. 4, the power system control apparatus 100 according to an embodiment of the present invention additionally inputs a generator to the power system 10 in order to prepare for output variability of a renewable energy source. Increase the constant and improve the overall frequency characteristics.

In addition, the power system control apparatus 100 according to an embodiment of the present invention increases the final frequency by increasing the frequency response resource. In addition, the power system control device 100 increases the inertia of the power system 10 to suppress the frequency drop rate of the power system 10 at the beginning of occurrence of an event such as a generator dropout or excessive output fluctuation of a renewable energy source. Since the power system control device 100 supplies power required to the power system 10 through a separate generator or a power supply resource such as a BESS after the occurrence of the event as described above, the frequency characteristics of the power system may be improved.

5 is a graph showing a frequency change during BESS control due to the occurrence of output variability of a renewable energy source according to an embodiment of the present invention.

First, when the ratio of nuclear and renewable energy sources to the power system 10 is high, it is difficult to secure the number of generators participating in the frequency response, and thus additional power supply resources to replace them are required. BESS (30) is a frequency responsive resource that can be used in such a system situation.

The BESS 30 can effectively cope with an instantaneous output change such as a change in the output of the renewable energy source 40 by promptly supplying the power required to the power system 10 due to the fast frequency response characteristic. In addition, since the BESS 30 is free to set the generator constant, all of the input control capacity within the frequency maintenance range of the power system 10 can be utilized, so the efficiency is high in controlling the variability of new and renewable energy.

Therefore, the power system control device 100 according to an embodiment of the present invention calculates the equivalent BESS capacity having the same effect as that the flexible generator is input to the system, and converts the BESS 30 having the corresponding capacity into the power system ( Control to put in 10).

Referring to FIG. 5, except for the addition of the BESS capacity, there is no difference in the power configuration compared to the case of adding a generator as in FIG. 6, and thus there is no change in the inertia constant and the generator constant. In addition, even if the BESS and the flexible generator have the same output target value for frequency change, the output characteristics of BESS are better, so the lowest frequency appears higher in the case of the same capacity, and the same frequency characteristics as a general generator with less capacity than a general generator. Can have.

For example, considering that the reserve power secured by a 1,000MW generator is 50MW (based on a 5% reserve rate), the calculated equivalent BESS capacity is about 27MW. Accordingly, the present invention has a frequency characteristic effect such as inputting a generator with a BESS capacity of about 54% of the generator capacity.

As described above, the present invention calculates the amount of responsiveness of the power system according to the output variability of the renewable energy source linked to the power system, and controls the power supply resource of the power system based on the responsive amount, It solves the problem of power supply and demand imbalance due to output fluctuations and provides an environment in which the frequency of the power system can be stably maintained.

In addition, the present invention calculates the frequency characteristic constant of the power system and calculates the BESS capacity based on the frequency characteristic constant, thereby efficiently operating the power supply resource of the power system, and thus the frequency of the power system due to the output variability of the renewable energy source. It provides an environment that can minimize change.

In addition, the present invention calculates the amount of additional power required for the power system according to the short-term output fluctuation of the renewable energy source, and calculates the generator capacity or the BESS capacity by subtracting the response amount from the additional power amount, but the predicted response amount of the power system If it is greater than the reserve power, the predicted response amount is limited to the reserve power amount, thereby effectively providing the power required for the power system according to the output fluctuation of the renewable energy source, providing an environment that can solve the power supply and demand imbalance problem in the power system. do.

In addition, the present invention provides an environment capable of effectively coping with instantaneous output fluctuations of a renewable energy source by predicting output fluctuations of a renewable energy source and controlling BESS based on the predicted output fluctuations.

In addition, the present invention determines the equivalent BESS capacity having the same characteristics as the input of a flexible generator, and controls the operation of the BESS linked to the power system based on the BESS capacity when it is difficult to input additional generators to the power system, It provides an environment that can minimize the frequency change of the power system due to the instantaneous output fluctuation of a renewable energy source.

The embodiments of the present invention described above are not implemented only through an apparatus and a method, but may be implemented through a program that realizes a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Such a recording medium can be executed not only in the server but also in the user terminal.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (18)

In the method of controlling the power system according to the output fluctuation of the renewable energy source linked to the power system,
Calculating the output variability of the renewable energy source according to the output amount of the renewable energy source,
Using the output variability of the renewable energy source and the generator capacity of the power system, the response amount of the power system is predicted, but the frequency characteristic constant of the power system is calculated using the power system data, and the renewable energy source is based on the frequency characteristic constant. Determining the amount of response according to the variability in the output of the energy source,
Calculating the response amount of each individual generator using the capacity of the individual generator and the generator constant set for the individual generator, and calculating the total response amount of the power system by summing the response amount of individual generators linked to the power system, and
Controlling the operation of the BESS linked to the power system based on the total amount of the power system applied to the power system control method according to the output fluctuation of the renewable energy source. delete In claim 1,
The frequency characteristic constant of the power system is,
Generator constants of individual generators that determine the rate at which the individual generator's output is adjusted according to frequency changes.
Power system control method according to the output fluctuation of the renewable energy source comprising a. delete In claim 1,
The frequency characteristic constant of the power system is,
Including a generator constant of the power system that determines the ratio of adjusting the output of the generators linked to the power system based on the frequency change of the power system,
The ratio is equally applied to all generators connected to the power system according to the output variation of the renewable energy source power system control method. In clause 5,
The step of determining the amount of response,
The step of calculating the total amount of response of the power system based on the total power generation amount of the generators connected to the power system and the generator constant of the power system.
Power system control method according to the output fluctuation of the renewable energy source comprising a. In claim 1,
The step of determining the amount of response,
Calculating the amount of additional power required for the power system according to the short-term output fluctuation of a renewable energy source, and calculating a generator capacity or BESS (Battery Energy Storage System) capacity by subtracting the predicted response amount from the additional power amount.
Power system control method according to the output fluctuation of the renewable energy source comprising a. In clause 7,
The step of calculating the BESS capacity,
When the predicted amount of response is greater than the amount of reserve power of the power system, the predicted amount of response is limited to the amount of reserve power. In clause 7,
The step of calculating the BESS capacity,
Determining an equivalent BESS capacity having the same or similar frequency characteristics as when the generator capacity is put into the power system
Power system control method according to the output fluctuation of the renewable energy source comprising a. In clause 7,
Controlling the operation of the BESS linked to the power system,
Controlling the operation of the BESS linked to the power system based on the BESS capacity
Power system control method according to the output fluctuation of the renewable energy source comprising a. In claim 10,
Controlling the operation of the BESS,
Controlling on/off of a plurality of BESSs linked to the power system
Power system control method according to the output fluctuation of the renewable energy source comprising a. Predict the amount of response of the power system according to the output variability of the renewable energy source linked to the power system, but calculate the frequency characteristic constant of the power system using the power system data, and the renewable energy source based on the frequency characteristic constant The response amount prediction unit determining the response amount according to the output variability of, and
It includes an operation control unit for controlling a generator or BESS (Battery Energy Storage System) connected to the power system based on the amount of response of the power system,
The response amount prediction unit,
Renewable energy that calculates the total response amount of the power system by calculating the response amount of each individual generator using the capacity of the individual generator and the generator constant set for the individual generator, and summing the response amount of individual generators connected to the power system. Power system control device according to the fluctuation of the output of the source. In claim 12,
The renewable energy source,
A power system control device according to output fluctuations of a renewable energy source including at least one of a wind generator, a solar generator, a geothermal generator, a fuel cell, bio energy, and marine energy. delete In claim 12,
The response amount prediction unit,
According to the output fluctuation of a renewable energy source that calculates the total amount of reaction of the power system based on the total amount of power generation of the generators connected to the power system and the generator constant of the power system applied equally to all the generators connected to the power system. Power system control device. In claim 12,
The response amount prediction unit,
BESS capacity determination unit that determines the BESS capacity to cope with the fluctuations in the output of the renewable energy source
Power system control device according to the output fluctuation of the renewable energy source comprising a. In claim 12,
The response amount prediction unit,
Calculate the amount of additional power required for the power system according to the short-term output fluctuation of the renewable energy source, and calculate the generator capacity or the battery energy storage system (BESS) capacity by subtracting the predicted response amount from the additional power amount
When the predicted response amount is greater than the reserve power amount of the power system, the predicted response amount is the power system control device according to the output fluctuation of a renewable energy source limited to the reserve power amount. In claim 12,
The driving control unit,
It includes a BESS control unit that controls the operation of the BESS linked to the power system based on the BESS capacity,
The BESS control unit,
A power system control device according to a change in output of a renewable energy source that controls on/off of a plurality of BESSs linked to the power system.

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