KR20210007527A - Surge voltage supply device and method for controlling surge voltage supply device - Google Patents

Abstract

According to an embodiment of the present invention, provided is an energy storage system (ESS) which more efficiently provides a surge voltage. The ESS comprises: a plurality of battery modules; a control unit controlling the plurality of battery modules; and a storage element in which a reference voltage which is a rated output voltage of an ESS, a first reference time which is the maximum time allowing an ESS to continuously supply a surge voltage to a load, and a second reference time which is the minimum time limiting output to be less than the rated output voltage after the ESS supplies the surge voltage are stored. The control unit can control an output voltage of the ESS by counting a first accumulated time which is an accumulated time supplying the surge voltage from the ESS to the load.

Description

Surge voltage supply device and method for controlling surge voltage supply device

The present invention relates to an apparatus for providing a surge voltage and a method for controlling the apparatus for providing a surge voltage.

Specifically, it relates to a surge voltage providing device and a method of controlling the surge voltage providing device by controlling the output voltage according to the time to provide the surge voltage to more efficiently provide the surge voltage.

Electric energy is widely used because it is easy to convert and transmit. In order to efficiently use such electric energy, an energy storage system (ESS) is used. The energy storage system is charged by receiving power from the outside. In addition, the energy storage system supplies power to the load by discharging the charged power when the load requires power.

On the other hand, in the energy storage system, there are cases where a large surge voltage must be supplied to the load. For example, an instantaneous power failure or an instantaneous large surge voltage is required when a load is turned on.

Since such a large surge voltage may exceed the design specifications of the energy storage system, if a large surge voltage is supplied to a load for a long time, there is a problem that the performance of the energy storage system may be deteriorated.

Conventionally, in order to solve this problem, a large surge voltage is supplied to the load only for a short period of time, and after the large surge voltage is supplied to the load once, a method of restraining for a predetermined time has been used.

However, the conventional method has a disadvantage in that it cannot cope with a large surge voltage during the rest time, since it must be rested even when a large surge voltage is supplied to the load for a very short time that does not actually burden the energy storage system.

In order to solve the shortcomings of this conventional method, in the present invention, the time to supply a large surge voltage is checked, and when the time to supply the large surge voltage is less than a predetermined reference time, the rest is not performed. Also, we propose a device and method that can supply a surge voltage to a load.

Korean Patent Application Publication KR 1684500 B1

The present invention provides a surge voltage providing apparatus and a method of controlling the surge voltage providing apparatus that more efficiently provide a surge voltage by controlling an output voltage according to a time for providing the surge voltage.

The ESS according to an embodiment of the present invention includes a plurality of battery modules, a control unit that controls the plurality of battery modules, a reference voltage that is the rated output voltage of the ESS, and the maximum time that the ESS can continuously supply a surge voltage to a load. 1 reference time, after the ESS supplies the surge voltage, it is configured to include a storage device that stores the second reference time, which is the minimum time to limit the output to less than the rated output voltage, and the control unit By detecting the accumulated time supplying the surge voltage, the output voltage of the ESS can be controlled.

The control unit determines that a surge voltage is required when the required voltage from the load exceeds the reference voltage, the first time that is the time when the ESS supplies the surge voltage to the load and the ESS supplies the surge voltage to the load. Is counted, and when the accumulated first time, which is the accumulated counted time, is equal to or greater than the first reference time, the output of the ESS is limited to less than or equal to the reference voltage for at least a second reference time or longer, and the accumulated first time If it is less than the first reference time, when a surge voltage request signal is transmitted from the load, the ESS may supply the surge voltage to the load.

The control unit may initialize the accumulated first time when limiting the output of the ESS to less than the reference voltage for at least the second reference time or longer, or when there is no request to supply a surge voltage from the load during the second reference time. .

A method of controlling an output voltage of an ESS (Energy Storage System) providing a surge voltage according to an embodiment of the present invention includes the step of checking whether a surge voltage is required to check whether a surge voltage needs to be supplied to a load by a controller of the ESS, the When it is determined that surge voltage supply to the load is necessary in the step of checking whether a surge voltage is needed, the first time, which is the time when the surge voltage is supplied to the load in the surge voltage supply step and the surge voltage supply step, is accumulated. The accumulated first time count step, a second time count step of counting a second time that is a time after the supply of the surge voltage to the load is stopped, limiting the counted second time or the output of the ESS to less than the reference voltage And an initialization determination step of determining whether or not one hour is equal to or greater than the second reference time and determining whether the time at which the first time is accumulated and counted is initialized, and the time at which the first time is accumulated and counted is a first reference time. If it is longer than the time, if the output of the ESS is limited to less than the reference voltage for at least the second reference time or longer, and if the accumulated count time of the first time is less than the first reference time, it is determined that supply of the surge voltage to the load is necessary. Surge voltage can be supplied to the load.

In the step of determining whether a surge voltage is required, the voltage required by the load is measured to determine whether it exceeds the reference voltage, and if the voltage required by the load is higher than the reference voltage, it is determined that a surge voltage is required, and the load requests it. When the applied voltage is less than or equal to the reference voltage, it may be determined that the surge voltage is not required.

The reference voltage may be a rated output voltage preset according to the specification of the ESS.

The first reference time may be a maximum time during which the ESS can continuously supply a surge voltage to a load.

The second reference time may be a minimum time when the ESS supplies the surge voltage and then limits the output to a rated output voltage or less.

On the other hand, while the cumulative counting time of the first time is greater than or equal to the first reference time, and the output of the ESS is limited to less than or equal to the reference voltage for at least the second reference time, the reference Only voltages below the voltage can be supplied to the load.

In the initializing determination step, when the counted second time or a time limiting the output of the ESS to a reference voltage or less is greater than or equal to a second reference time, the accumulated counted time of the first time is initialized, and the counted When the second time and the time limiting the output voltage of the ESS to the reference voltage or less are less than the second reference time, the time at which the first time is accumulated and counted may not be initialized.

In the present invention, the surge voltage can be efficiently supplied by measuring the time for supplying the surge voltage to the load and controlling the output voltage of the ESS according to the time for supplying the measured surge voltage to the load.

In addition, according to the present invention, by measuring the time for supplying the surge voltage to the load and controlling the output voltage of the ESS according to the time for supplying the measured surge voltage to the load, it is possible to prevent damage to the energy storage system.

1 is a diagram showing the configuration of an ESS that supplies a surge voltage according to an embodiment of the present invention.
2 is a diagram showing a relationship between a supply time of a surge voltage and an output voltage of an ESS.
3 is a flowchart illustrating a method of controlling an output voltage of an ESS 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 may easily implement the present invention. However, the present invention may be implemented in various 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 attached to similar parts throughout the specification.

Terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The terms used in the present application are used only to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Throughout the specification, when a part is said to be “connected” to another part, this includes not only the case that it is “directly connected”, but also the case that it is “electrically connected” with another element in between. . In addition, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. As used throughout the specification of the present application, the term "step (to)" or "step of" does not mean "step for".

The terms used in the present invention have been selected from general terms that are currently widely used while considering functions in the present invention, but this may vary depending on the intention or precedent of a technician working in the field, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

1. An ESS that supplies a surge voltage according to an embodiment of the present invention.

1 is a diagram showing the configuration of an ESS that supplies a surge voltage according to an embodiment of the present invention.

Hereinafter, an ESS for supplying a surge voltage according to an embodiment of the present invention will be described with reference to FIG. 1.

The ESS 100 for supplying a surge voltage according to an embodiment of the present invention includes a plurality of battery modules 110, a control unit 120 controlling the plurality of battery modules 110, and a reference voltage that is the rated output voltage of the ESS. , The first reference time, which is the maximum time that the ESS can continuously supply the surge voltage to the load, and the second reference time, which is the minimum time to limit the output to below the rated output voltage after the ESS supplies the surge voltage, are stored. The storage device 130 is configured, and when a voltage higher than the reference voltage is required from the load, a surge voltage greater than the reference voltage may be applied to the load.

Specifically, when the required voltage from the load exceeds the reference voltage, the controller 120 determines that a surge voltage is necessary, supplies a surge voltage from the ESS to the load, and surges from the ESS 100 to the load. When the first time, which is the time when the voltage is supplied, is counted, and when the accumulated first time, which is the time when the first time is accumulated and counted, is equal to or greater than the first reference time, the output of the ESS is equal to or less than the reference voltage for at least a second reference time or longer. Can be limited to

For example, in the case of an ESS with a second reference time of 10 minutes, if the first accumulated time supplying the surge voltage is greater than or equal to the first reference time, the output of the ESS is limited to less than the reference voltage for at least 10 minutes, and Even if there is a surge voltage request from the load, the surge voltage may not be supplied.

Meanwhile, when the accumulated first time is less than the first reference time, when it is determined that a surge voltage is required from the load, the control unit 120 supplies the surge voltage from the ESS to the load.

That is, even if the surge voltage is supplied once, the output voltage of the ESS is not immediately limited to the reference voltage or less, but the output voltage of the ESS is adjusted to the reference voltage or less according to the accumulated first time accumulated the first time supplying the surge voltage. Limit.

Meanwhile, FIG. 2 is a diagram showing a relationship between a supply time of a surge voltage and an output voltage of an ESS.

For example, 10 seconds in which the surge voltage is supplied to the load for 3 seconds in the ESS with the first reference time of 10 seconds and the second reference time of 10 minutes (a), and the supply of the surge voltage for 3 seconds ends. In the case of supplying the surge voltage for 5 seconds later (b) again, in the conventional ESS, the surge voltage supply (a) for the first 3 seconds as shown in FIG. 2(a) can be normally performed, but for 3 seconds Immediately after performing the surge voltage supply, the output voltage of the ESS is limited to below the reference voltage for at least 10 minutes (during the second reference time), so the supply (b) of the surge voltage for the next 5 seconds cannot be performed. .

However, in the present invention, when a surge voltage is supplied to the load for 3 seconds as shown in FIG. 2(b), the surge voltage is supplied for 3 seconds, and the first accumulated time after supplying the surge voltage is 3 seconds. Since the output voltage of is not limited to less than the reference voltage, the surge voltage (b) can be supplied for 5 seconds after 10 seconds after the supply of the surge voltage for 3 seconds is terminated. In addition, the first accumulated time may be counted as 8 seconds (a+b). Meanwhile, after the first accumulated time is counted as 8 seconds, the surge voltage for 2 seconds may be supplied to the load again after 2 seconds (c). In this case, since the ESS supplies the surge voltage for 2 seconds and then the first accumulated time becomes 10 seconds (a+b+c), the output voltage of the ESS is at least 10 minutes (during the second reference time). ) It can be limited to below the reference voltage.

Meanwhile, the control unit may initialize the first accumulated time when limiting the output of the ESS to less than the reference voltage for at least the second reference time or longer, or when there is no request to supply a surge voltage from the load during the second reference time. I can.

In other words, when the cumulative first time accumulating the first time is greater than or equal to the first reference time, the control unit limits the output voltage of the ESS to the reference voltage or less for at least the second reference time or longer, and then accumulates the first time. One accumulated first time may be initialized to 0, and the accumulated first time may be counted again from 0 when the next surge voltage is supplied.

In addition, even if the accumulated first time accumulating the first time is not equal to or greater than the first reference time as shown in (c) of FIG. 2, when there is no surge voltage request from the load for the second reference time, the ESS is It is regarded as one and the first accumulated time can be initialized.

For example, when the second reference time is 10 minutes (600 seconds), after supplying the surge voltage for 5 seconds to the load as shown in Fig. 2(c), the surge voltage is supplied for 10 minutes (600 seconds) Otherwise, the first accumulated time can be initialized.

Meanwhile, when the first accumulated time becomes more than the first reference time in the middle of supplying the surge voltage to the load, the controller may immediately limit the output voltage of the ESS to less than the reference voltage. This is to prevent safety accidents such as sudden deterioration, ignition, and explosion of ESS.

2. A method of controlling the output voltage of an ESS according to an embodiment of the present invention.

In general, it is desirable to output the ESS below the rated output voltage, but in order to prepare for a situation where the load requests an output voltage that exceeds the specification of the ESS momentarily, a voltage above the rated output voltage of the ESS is used as the load for a short predetermined period of time. Can be designed to supply. When an output voltage that is instantaneously exceeding the ESS specification is requested by a load, for example, a power outage occurs or the load is momentarily turned on.

On the other hand, after the ESS instantaneously supplies a voltage higher than the rated output voltage of the ESS to the load, the ESS can be safely used only when a predetermined rest time is provided.

In the case of continuously supplying a voltage higher than the rated output voltage to the load without rest time, the battery cells rapidly deteriorate, and safety problems such as ignition, explosion, and electric leakage may occur.

For this reason, conventionally, when the ESS supplies a voltage higher than the rated output voltage to the load, the rest time is immediately set regardless of the time the voltage higher than the rated output voltage is supplied.

For this reason, the conventional method has a problem that cannot be coped with at all when a voltage higher than the rated output voltage is supplied during the rest time after supplying a voltage higher than the rated output voltage.

Accordingly, the present invention proposes a method of efficiently controlling an ESS output voltage providing a surge voltage.

3 is a flowchart showing a method of controlling an output voltage of an ESS according to an embodiment of the present invention.

Hereinafter, a method of controlling an output voltage of an ESS according to an embodiment of the present invention will be described with reference to FIG. 3.

The method for controlling the output voltage of an ESS according to an embodiment of the present invention includes a step of checking whether a surge voltage is required (S100) for checking whether a surge voltage is required to be supplied from a BMS of the ESS to a load (S100), and a step (S100). ), when it is determined that the surge voltage supply to the load is necessary, the surge voltage supply step (S200) of supplying the surge voltage, and the first time, which is the time when the surge voltage is supplied to the load in the surge voltage supply step (S200), are accumulated Accumulated first time counting step (S300) of counting, a second time counting step (S600) of counting a second time that is a time after the supply of the surge voltage to the load is stopped, the counted second time or the ESS And an initialization determination step (S700) of determining whether or not the time at which the first time was accumulated and counted is initialized by checking whether the time limiting the output of the output to less than the reference voltage is greater than or equal to the second reference time. 1 The accumulated time and the first reference time are compared (S400), and when the accumulated counted time of the first time is greater than or equal to the first reference time, the output of the ESS is limited to less than or equal to the reference voltage for at least the second reference time or longer (S500 ), and when the accumulated count time of the first time is less than the first reference time, when it is determined that supply of the surge voltage to the load is necessary, the surge voltage is supplied to the load.

Meanwhile, the first reference time is a maximum time during which the ESS can continuously supply a surge voltage to a load. The first reference time is a value preset according to the specification of the ESS, and if the first reference time is exceeded in the process of supplying the surge voltage, the supply of the surge voltage is immediately stopped and the output voltage of the ESS falls below the reference voltage. limit? I can.

On the other hand, the second reference time is the minimum time when the ESS should limit the output to less than the rated output voltage after supplying the surge voltage. The second reference time is a value preset according to the specification of the ESS, and may be the same as the minimum time to keep the output voltage of the ESS below the reference voltage after the ESS applies a voltage to the load above the rated output voltage. have.

On the other hand, in the step (S100) of determining whether a surge voltage is required, the voltage required by the load is measured, and it is checked whether the voltage required by the load exceeds the reference voltage, and if the voltage required by the load exceeds the reference voltage, it is determined that a surge voltage is required. If the voltage required by the load is less than or equal to the reference voltage, it is determined that the surge voltage is not required.

For example, the reference voltage may be a rated output voltage of the ESS that is preset according to the specification of the ESS.

On the other hand, while the cumulative count of the first time is greater than or equal to the first reference time and the output voltage of the ESS is limited to less than the reference voltage, even when it is determined that a surge voltage is required from the load, the load is limited to the reference voltage or less. Apply voltage to

As described above, if there is no time to limit the output voltage of the ESS to below the reference voltage, and if a voltage that exceeds the rated output voltage is continuously applied to the load, the cell of the ESS will rapidly deteriorate, or the ESS will ignite, explode, Since a safety problem such as a short circuit may occur, in the present invention, a voltage is applied to the load only below the rated output voltage for at least the second reference time or longer.

For example, in the case of an ESS with a second reference time of 10 minutes, if the first accumulated time supplying the surge voltage is greater than or equal to the first reference time, the output of the ESS is limited to less than the reference voltage for at least 10 minutes, and Even if there is a surge voltage request from the load, the surge voltage may not be supplied.

That is, even if the surge voltage is supplied once, the output voltage of the ESS is not immediately limited to the reference voltage or less, and the first time that is the time the surge voltage was supplied is accumulated, and the accumulated first time is more than the first reference time, The output voltage of ESS can be limited below the reference voltage.

Specifically, a method of controlling an output voltage of an ESS according to an embodiment of the present invention in an ESS in which the first reference time is 10 seconds and the second reference time is 10 minutes will be described with reference to FIG. 2B.

First, in the step (S100) of determining whether a surge voltage is required, if it is determined that the surge voltage is required to be supplied to the load, the surge voltage is supplied for 3 seconds, and the accumulated first time is counted as 3 seconds in the first time accumulation count step (S300). do.

After the supply of the surge voltage for 3 seconds is completed, a second time counting step S600 of measuring a second time may be performed. When the surge voltage is again supplied to the load for 5 seconds while the second time counting step S600 is performed, the accumulated first time may be counted as 8 seconds in the first time accumulated counting step S300. Thereafter, the second time count step S600 of measuring the second time may be performed again.

Meanwhile, during the second time measurement step (S600), if it is determined that the surge voltage supply to the load is required again, the surge voltage is supplied for 2 seconds, and the accumulated first time is counted as 10 seconds in the accumulated first time counting step. I can.

As described above, when the accumulated first time reaches 10 seconds, it becomes more than the first reference time, and thus the output voltage of the ESS can be limited to less than the reference voltage.

Meanwhile, in the step of determining whether to initialize, the accumulated first time may be initialized when the counted second time or a time limiting the output voltage of the ESS to a reference voltage or less is greater than or equal to a second reference time.

Meanwhile, when the accumulated first time and the time limiting the output of the ESS to the reference voltage or less are less than the second reference time, the first accumulated time may not be initialized.

Specifically, when the output voltage of the ESS is limited to less than or equal to the reference voltage for more than the second reference time, it is determined that there will be no problem even if the ESS supplies the surge voltage again, and the first accumulated time can be initialized.

Meanwhile, as shown in FIG. 2C, even when the time measured in the second time measurement step S600 is equal to or greater than the second reference time, the accumulated first time may be initialized to zero.

The reason is that the ESS did not forcibly limit the output voltage of the ESS to less than the reference voltage, but it did not output the surge voltage (voltage exceeding the reference voltage) for a time longer than the second reference time. This is because the same effect as limiting the voltage to below the reference voltage can be obtained.

On the other hand, although the technical idea of the present invention has been described in detail according to the above embodiment, it should be noted that the above embodiment is for the purpose of explanation and not for the limitation thereof. In addition, those skilled in the art in the technical field of the present invention will be able to understand that various embodiments are possible within the scope of the spirit of the present invention.

100: ESS (Energy Storage System)
110: a plurality of battery modules
120: control unit
130: Repository

Claims (10)

A plurality of battery modules;
A control unit for controlling the plurality of battery modules; And
The reference voltage, which is the rated output voltage of the ESS, the first reference time, which is the maximum time that the ESS can continuously supply the surge voltage to the load, and the minimum that the output should be limited to less than the rated output voltage after the ESS supplies the surge voltage. A storage device in which a second reference time which is a time is stored;
Consists of including,
The control unit,
ESS, characterized in that it controls the output voltage of the ESS by detecting the accumulated time supplying the surge voltage from the ESS to the load.
The method according to claim 1,
The control unit,
When the required voltage from the load exceeds the reference voltage, it is determined that a surge voltage is necessary, and the surge voltage is supplied from the ESS to the load,
Count the first time, which is the time the surge voltage was supplied from the ESS to the load,
When the accumulated first time, which is the accumulated counted time of the first time, is greater than or equal to the first reference time, limiting the output of the ESS to less than or equal to the reference voltage for at least a second reference time or longer,
When the accumulated first time is less than the first reference time, when it is determined that a surge voltage is required from the load, the ESS supplies the surge voltage to the load.
The method according to claim 2,
The control unit,
When the output of the ESS is limited to less than the reference voltage for at least the second reference time or longer, or there is no request to supply a surge voltage from the load during the second reference time,
ESS, characterized in that initializing the accumulated first time.
In the method of controlling the output voltage of an ESS (Energy Storage System) providing a surge voltage,
A step of checking whether a surge voltage is needed in which the control unit of the ESS checks whether a surge voltage needs to be supplied to the load;
A surge voltage supply step of supplying a surge voltage when it is determined that supply of a surge voltage to a load is necessary in the step of determining whether a surge voltage is required;
An accumulated first time counting step of accumulating and counting a first time, which is a time when the surge voltage is supplied to the load in the surge voltage supply step; A second time counting step of counting a second time, which is a time after the supply of the surge voltage to the load is stopped;
A step of determining whether to initialize the counted second time or whether a time limiting the output of the ESS to less than a reference voltage is greater than or equal to a second reference time to determine whether to initialize the accumulated counted time of the first time;
Consists of including,
When the cumulative count time of the first time is greater than or equal to the first reference time, the output of the ESS is limited to less than or equal to the reference voltage for at least the second reference time or longer, and the cumulative counting time of the first time is less than the first reference time. In case, when it is determined that the supply of the surge voltage to the load is necessary, the surge voltage is supplied to the load.
The method of claim 4,
The step of checking whether the surge voltage is required,
Measure the voltage required from the load, check whether it exceeds the reference voltage, and determine that a surge voltage is necessary if the voltage required from the load exceeds the reference voltage,
When the voltage required by the load is less than or equal to a reference voltage, it is determined that a surge voltage is not required.
The method of claim 5,
The reference voltage is,
The output voltage control method of an ESS, characterized in that the rated output voltage is preset according to the specification of the ESS.
The method of claim 4,
The first reference time is,
The ESS output voltage control method, characterized in that the maximum time that the ESS can continuously supply a surge voltage to a load.
The method of claim 4,
The second reference time is,
After the ESS supplies the surge voltage, the output voltage control method of the ESS, characterized in that the minimum time to limit the output voltage below the rated output voltage.
The method of claim 4,
While the cumulative counting time of the first time is greater than or equal to the first reference time, and the output of the ESS is limited to less than or equal to the reference voltage for at least the second reference time or longer, even if it is determined that the supply of a surge voltage to the load is necessary, it is less than or equal to the reference voltage. Output voltage control method of ESS, characterized in that supplying only the voltage of the load to the load.
The method of claim 4,
The step of determining whether to initialize,
When the counted second time or the time limiting the output of the ESS to the reference voltage or less is greater than or equal to the second reference time, the accumulated counted time of the first time is initialized,
When the counted second time and the time limiting the output voltage of the ESS to less than the reference voltage is less than the second reference time, the accumulated counted time of the first time is not initialized. Way.

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