KR102333046B1 - Charge-discharge amount control device of energy storage system and control method - Google Patents

Abstract

Disclosed are a method and a control device for controlling the amount of charge and discharge of an ESS that can stably receive solar power generation power to a power system by predicting the amount of generation of a photovoltaic power generation complex, which is a generator, and controlling the charge/discharge amount of the ESS.
The device for controlling the amount of charge/discharge of an ESS according to the present invention includes: an energy storage device (ESS) for storing power output from a generator and supplying the stored power to various facilities and industrial complexes; and a control unit for controlling the charge/discharge amount of the electric power of the energy storage device (ESS), wherein the control unit includes a predictor for predicting the amount of power generation of the generator, and a value predicted by the prediction unit. and a preset reference value, charging the energy storage device (ESS) when the predicted value is greater than the reference value, and discharging the energy storage device (ESS) when the predicted value is less than the reference value. .

Description

CHARGE-DISCHARGE AMOUNT CONTROL DEVICE OF ENERGY STORAGE SYSTEM AND CONTROL METHOD

The present invention relates to an apparatus and a control method for controlling the amount of charge and discharge of an energy storage system (ESS) for stably receiving electric power to an electric power system.

The power system refers to a system from generation to consumption by connecting a power plant, a substation, and a load with a transmission line in response to electricity demand. Since generation and consumption of electricity occur at the same time in such a power system, supply and demand must be balanced. Accordingly, the power system is required to continuously monitor the balance of supply and demand.

However, the power system was easy to monitor when it was small, but as the demand for power gradually increased due to the advancement of industry and informatization, power facilities were also enlarged and complicated, so it was difficult to effectively operate the power system through the artificially performed method so far. reached

As the energy storage system (hereinafter referred to as “ESS”) is researching on increasing the capacity and longevity of lithium-ion batteries, mainly in the transportation energy fields such as hybrid electric vehicles (HEV) and electric vehicles (EV), It is a technology necessary for the commercialization of large-sized lithium-ion batteries.

Recently, in relation to ESS, the commercialization of domestic power grid input is being actively carried out, and a system for revitalizing the market is being prepared. As one of these, renewable energy, especially solar power generation facilities, are rapidly spreading.

Although the acceptability of renewable electricity generated by the power system is limited, renewable energy generation facilities are unilaterally supplying power to the power system without considering the acceptability of the power system. In a situation where large-scale renewable power generation facilities are being built, this can cause serious problems in the power system. In addition, in an environment where photovoltaic power generation facilities are built on a large scale, while supplying power to the power system during the day, solar power cannot be generated during the evening or shadows caused by clouds, which greatly affects the power system.

Accordingly, in order to minimize the adverse effect on the power system, it is necessary to predict the amount of power generation through the prediction of the amount of solar power generation and to control the charge/discharge amount of the ESS to stably supply power to the power system.

An object of the present invention is to provide an apparatus for controlling the amount of charge/discharge of an energy storage system (ESS) in which an electric power system can receive power stably.

Another object of the present invention is to provide a control method using a charge/discharge amount control device of an energy storage system (ESS).

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The device for controlling the amount of charge and discharge of an ESS according to the present invention includes: an energy storage device (ESS) for storing power output from a generator and supplying the stored power to various facilities and industrial complexes; and a control unit for controlling the charge/discharge amount of the electric power of the energy storage device (ESS), wherein the control unit includes a predictor for predicting the amount of power generation of the generator, and a value predicted by the prediction unit. and a preset reference value, and if the predicted value is greater than the reference value, the energy storage device (ESS) is charged, and when the predicted value is less than the reference value, the control unit for discharging the energy storage device (ESS) may be included. .

The method for controlling the amount of charge and discharge of an ESS according to the present invention comprises the steps of: (a) storing the power output from the generator in an energy storage device (ESS), and supplying the stored power to various facilities and industrial complexes; and (b) controlling the charge/discharge amount of the electric power of the energy storage device (ESS) by the controller; in which the controller predicts the amount of power generation of the generator, and compares the predicted value with a preset reference value, the If the predicted value is greater than the reference value, the energy storage device (ESS) may be charged, and if the predicted value is less than the reference value, the energy storage device (ESS) may be discharged.

The charging/discharging amount control technology of the ESS according to the present invention predicts the generation amount of the solar power generation complex, which is a generator, and controls the charge/discharge amount of the ESS, so that the power system can receive solar power generation power stably.

In addition, the charging/discharging amount control technology of the ESS of the present invention can check whether the ESS is charged in real time according to the amount of solar power generation.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 is a schematic diagram of an apparatus for controlling the amount of charge/discharge of an ESS according to the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

In the following, that an arbitrary component is disposed on the "upper (or lower)" of a component or "upper (or below)" of a component means that any component is disposed in contact with the upper surface (or lower surface) of the component. Furthermore, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Also, when it is described that a component is "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that “or, each component may be “connected,” “coupled,” or “connected” through another component.

Hereinafter, an apparatus and a control method for controlling the amount of charge/discharge of an ESS according to an embodiment of the present invention will be described.

In the present invention, the generator may be a solar power module generated by solar power or a solar power module generated by solar heat. Generators that produce energy generally produce DC power in most cases.

An object of the present invention is to provide a control technology that enables the power system to receive power stably by determining whether to charge or discharge the ESS by predicting the amount of power generation using the power generation history and weather information of the generator.

As shown in FIG. 1 , the device for controlling the amount of charge/discharge of an ESS according to the present invention includes an energy storage device (ESS) 10 and a control unit 20 .

The ESS 10 is one of the power systems, and supplies power within the allowable power or maximum power range to various facilities and industrial complexes. The ESS 10 stores the power output from the generator, and supplies the stored power to various facilities and industrial complexes.

Various facilities and industrial complexes refer to power generation sources capable of generating electricity such as private hotels, resorts, aquaculture farms, greenhouse facilities, buildings, self-used renewable energy industrial complexes, motors in homes or factories, and heat exchangers.

These places generally consume energy in the form of alternating current power. Therefore, in order to deliver the energy produced by the generator to various facilities and industrial complexes, a means of converting it into AC power is required.

The ESS 10 may include a converter (not shown) that converts DC power among power output from the generator into AC power. The AC power converted through the converter can be stored in the ESS, and the stored power can be supplied to various facilities and industrial complexes.

When the power system is operated in a normal state, components such as generators, lines, and loads are electrically balanced with each other. However, when a disturbance or disturbance such as loss of power generation, line failure, load fluctuation, etc. occurs, the system may be disturbed. Depending on the degree of disturbance or the state of the system, the disturbance may soon recover and maintain a new normal state, or if severe, the connection of each component may be continuously disconnected and the power system may collapse. In other words, disturbance or disturbance of the power system may lead to instability of the power system and cause a large-scale blackout.

In order to prevent such a problem, the present invention includes a control unit 20 for controlling the amount of charging and discharging power of the ESS in order to maintain a stable power supply of the power system. It is possible to control whether the ESS is being charged in real time through the control unit.

The control unit 20 includes a prediction unit 21 and an adjustment unit 22 .

The prediction unit 21 serves to predict the amount of power generation of the generator. In this case, the amount of power generation of the generator can be predicted by collecting information such as the amount of history information, weather information, solar radiation, and solar time of the solar power generator.

The control unit 22 compares the value predicted by the prediction unit with a preset reference value, and serves to charge or discharge. Here, the preset reference value is a reference value preset by the control unit and means an average value of the amount of power generation.

The control unit 22 charges the energy storage device (ESS) when the predicted value is greater than the reference value. And the amount of electricity supplied to various facilities and industrial complexes is reduced.

That is, if the amount of power generated by the generator is predicted to increase, the ESS can be charged in advance. This is because it is more efficient to store energy in the ESS, take out the stored energy when necessary, and supply and deliver it to various facilities and industrial complexes rather than selling or consuming electricity.

Conversely, if the predicted value is less than the reference value, the energy storage device (ESS) is discharged. Increase the amount of electricity supplied to various facilities and industrial complexes. That is, if the amount of power generated by the generator is predicted to decrease, the ESS can be discharged.

For example, the prediction unit 21 may predict the power generation amount of the generator and store the predicted value as about 1000 kW. When the preset reference value is 800kW, the controller charges the ESS because the predicted value is larger than the reference value, and reduces the amount of electricity supplied to various facilities and industrial complexes. In this case, reducing the amount of power means reducing the amount of power actually being supplied.

When the predicted value is stored as about 750 kW, the ESS is discharged because the predicted value is smaller than the reference value, and the amount of power supplied to various facilities and industrial complexes is increased. In this case, increasing the amount of power means increasing the amount of power actually being supplied.

In addition, the charge/discharge amount control device of the ESS further includes a signal unit (not shown). The signal unit displays a signal in color or sound so that a user or manager can recognize when the amount of power remaining in the ESS is less than the reference value. For example, assuming that the standard value of the amount of power accommodated in the ESS is 500 kW, when the residual power of the ESS is gradually consumed and reaches 490 kW, a signal is displayed in the signal unit. The user who confirms the signal unit supplies power to the ESS to charge it. Therefore, when the amount of power accommodated in the ESS is less than the reference value during charging or discharging, charging may be performed by the notification of the signal unit.

The control method using the charging/discharging amount control device of the ESS of the present invention includes the steps of storing the power output from the generator in an energy storage device (ESS), and supplying the stored power to various facilities and industrial complexes, and the energy storage device (ESS) ) and controlling the charge/discharge amount of power in the control unit. The details of the ESS and the control unit are the same as described above.

The control unit predicts the amount of power generation of the generator, compares the predicted value with a preset reference value, and charges the ESS if the predicted value is greater than the reference value. And the amount of electricity supplied to various facilities and industrial complexes is reduced.

Conversely, if the predicted value is less than the reference value, the energy storage device (ESS) is discharged. And the amount of electricity supplied to various facilities and industrial complexes is increased.

The ESS may include a converter that converts DC power among power output from the generator into AC power. The details of the conversion unit are the same as described above.

As such, the ESS charge/discharge control technology according to the present invention predicts the amount of generation of a solar power generation complex, which is a generator, and controls the charge/discharge amount of the ESS, so that the power system can receive solar power stably. In addition, the charging/discharging amount control technology of the ESS of the present invention has an effect of checking whether the ESS is charged in real time according to the amount of solar power generation.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention are not explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

10: ESS
20: control unit
21: prediction unit
22: control unit

Claims (6)

The charge/discharge amount control device of the energy storage system (ESS) is
an energy storage system (ESS) that stores the power output from the generator and supplies the stored power to various facilities and industrial complexes; and
A control unit for controlling the charge/discharge amount of power of the energy storage device (ESS); includes,
Further comprising a signal unit indicating a color or sound so that a user or an administrator recognizes when the amount of residual power of the energy storage device (ESS) is less than a reference value,
The energy storage device (ESS) includes a converter for converting DC power among the power output from the generator into AC power,
the control unit
And a prediction unit for predicting the amount of power generation of the generator;
The prediction unit compares the predicted value with a preset reference value, and if the predicted value is greater than the reference value, the energy storage device (ESS) is charged, and if the predicted value is less than the reference value, the energy storage device (ESS) is discharged It includes a control unit that
When the predicted value is greater than the reference value, the amount of power supplied to various facilities and industrial complexes is reduced, and when the predicted value is less than the reference value, the amount of power supplied to various facilities and industrial complexes is increased.
delete delete (a) storing the power output from the generator in an energy storage system (ESS), and supplying the stored power to various facilities and industrial complexes; and
(b) controlling the charging/discharging amount of power of the energy storage device (ESS) by a control unit;
When the amount of power remaining in the energy storage device (ESS) is less than the reference value, the signal unit displays a color or sound so that the user or manager can recognize it,
The conversion unit included in the energy storage device (ESS) converts DC power among the power output from the generator into AC power,
Predicting the amount of power generation of the generator in the prediction unit included in the control unit,
By comparing the value predicted by the control unit included in the control unit with a preset reference value, if the predicted value is greater than the reference value, the energy storage device (ESS) is charged, and if the predicted value is less than the reference value, the energy storage device ( ESS) is discharged,
When the predicted value is greater than the reference value, the amount of power supplied to various facilities and industrial complexes is reduced, and when the predicted value is less than the reference value, the amount of power supplied to various facilities and industrial complexes is increased.
delete delete

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