KR102453046B1 - Voltage control device for conservation voltage reduction through voltage optimization control based on Electric Vehicle charging station load prediction model - Google Patents

Abstract

According to the present invention, power supplied from the power system of a voltage control device can be distributed to a plurality of power receiving system nodes. The voltage control device comprises: a management server including a predicted voltage calculation unit which receives continuous power data from power receiving system nodes in real time and calculates the predicted voltage of the power receiving system nodes, or an adjusted voltage calculation unit for calculating an adjusted voltage for conservation voltage reduction (CVR); and a voltage adjustment unit for receiving the adjusted voltage and controlling the voltage of the power receiving system nodes. The power receiving system nodes of the voltage control device may include at least one among an electric vehicle charger, a switchboard for controlling the voltage of the electric vehicle charger, or a charging station equipped with a plurality of electric vehicle chargers. Therefore, the voltage control device can predict the charge amount of an electric vehicle charging state or power usage thereof and adjust the voltage to stabilize the voltage of the electric vehicle charging station that varies according to customer distribution or over time and to obtain a CVR effect.

Description

Voltage control device for conservation voltage reduction through voltage optimization control based on Electric Vehicle charging station load prediction model}

The present invention relates to a voltage control device for maintaining voltage drop through voltage optimization control based on a load prediction model including an electric vehicle charger or a charging station as a load of a power receiving system node.

Voltage reduction may include CVR (conservation voltage reduction), EVR (emergency voltage reduction), and RVR (routine voltage reduction) depending on the implementation purpose, and CVR can be mainly used in terms of reducing load demand by reducing voltage.

Conservation voltage drop (CVR) may be used as one of energy reduction technologies including energy consumption reduction and peak load reduction for efficient and stable power supply, and the maintenance voltage drop may be to reduce power consumption by reducing the feeder voltage. have. In other words, the CVR for stably and efficiently supplying power to the power distribution network can be used in emergencies such as supply-demand imbalance by reducing the size of the load by lowering the voltage to reduce the power consumption.

In the past, most of the unilateral maintenance voltage drop was implemented for reasons such as power peaks at consumers at power exchanges or power plants that supply or control power to the power system. With the advent of supply sources, the need to implement a maintenance voltage drop near the nodes of the power receiving system is increasing.

The electric vehicle charger or charging station may be included in the load of the power receiving system node, and the power demand varies in real time according to the amount of charging the electric vehicle by the customer, thereby affecting the maintenance voltage drop (CVR) near the receiving system node.

Therefore, even when the load is an electric vehicle charger or charging station, there is a need for a method of stabilizing the voltage or operating the voltage in the lowest voltage section within the allowable range to obtain the effect of enhancing the conservation voltage.

The voltage control device of the present invention may adjust the voltage by predicting the electric vehicle charging amount or power consumption of the electric vehicle charging station in order to stabilize the voltage of the electric vehicle charging station, which varies according to customer distribution or time, and to obtain a conservation voltage drop effect.

The present invention can generate a load prediction model using machine learning for the maintenance voltage drop implemented at the node of the power receiving system, and control the voltage to the lowest section within the allowable range based on the load prediction model.

The present invention economically and efficiently collects high-speed facility data required for machine learning-based CVR (conservation voltage reduction) that reduces electricity bills by reducing power consumption and improving power factor through voltage management of power consumer facilities at the same time as desired We want to provide a system that can do this.

The voltage control device of the present invention includes a second voltage regulator capable of individually controlling the voltage of each power receiving system node in addition to the first voltage adjusting unit included in the power distribution board or disposed nearby, and has a more precise and safe two-step structure. Conservative voltage drop (CVR) can be performed.

Power supplied from the power system of the voltage control device of the present invention may be distributed to a plurality of power receiving system nodes,

The voltage control device of the present invention receives continuous power data from the power receiving system node in real time, and a predicted voltage calculator that calculates the predicted voltage of the power receiving system node, or adjusts for conservation voltage reduction (CVR) A management server including a regulated voltage calculator for calculating a voltage may include a voltage regulating unit for receiving the regulated voltage and controlling the voltage of the power receiving system node,

The power receiving system node of the voltage control device of the present invention may include at least one of an electric vehicle charger, a power distribution panel controlling the voltage of the electric vehicle charger, or a charging station provided with a plurality of electric vehicle chargers.

The voltage control device of the present invention may adjust the voltage by predicting the electric vehicle charge amount of the charging station or electric vehicle charger in order to stabilize the voltage of the charging station or electric vehicle charger that varies according to customer distribution or time and to obtain a conservation voltage drop effect.

The voltage control device of the present invention can utilize the battery of an electric vehicle like an energy storage system (ESS), and is used as a storage device for surplus power when the power demand is low and the power supply is excessive. Deductions or benefits may be obtained.

Therefore, the voltage control device of the present invention operates the voltage of the charging station or the electric vehicle charger in the optimal voltage section corresponding to the lowest voltage section within the allowable range, so that when the real-time voltage changes, the life span of the charger including the shortening of the overvoltage or the undervoltage condition. problems can be prevented.

The voltage control device of the present invention predicts the voltage of the power receiving system node based on the prediction information of the electric vehicle surplus power stored in the node including the charging station or the electric vehicle charger and the electric vehicle charging amount consumed at the node, thereby the voltage of the electric power receiving system node It can be operated stably in the optimal operating period for this maintenance voltage drop (CVR).

The voltage control device of the present invention may predict in real time the voltage fluctuations of the power receiving system nodes connected to the power system so that the voltages of the nodes are within the allowable range and operated in the lowest section.

By predicting the voltage of the load, the voltage control device of the present invention can stably operate the voltage within the optimal operating period in consideration of the future voltage distribution.

The voltage control device of the present invention promotes voltage stabilization by using a method of predicting future voltage to minimize losses due to undervoltage and overvoltage caused by voltage regulation based on the current voltage, and maintains the lowest voltage within the allowable range. A conservation voltage drop effect can be obtained.

The voltage control device of the present invention includes a second voltage regulator capable of individually controlling the voltage of each power receiving system node in addition to the first voltage adjusting unit included in the power distribution board or disposed nearby, and has a more precise and safe two-step structure. Conservative voltage drop (CVR) can be performed.

1 is a configuration diagram of an embodiment of a voltage adjusting unit of a first stage of a voltage control device of the present invention.
2 is a configuration diagram of an embodiment of a voltage regulator of two stages of the voltage control device of the present invention.
3 is an embodiment of a power receiving system node including a charging station of the present invention.
4 is another embodiment of a power receiving system node including a charging station of the present invention.
5 is an explanatory diagram for the direction or tendency between the electric vehicle charge amount and the predicted voltage of the present invention.
6 is an explanatory diagram including specific values for the electric vehicle charging amount and predicted voltage of the present invention.
7 is an exemplary embodiment of calculating a predicted voltage according to the present invention.
FIG. 8 is another embodiment of FIG. 7 .
9 is an explanatory diagram of a data flow of the present invention.
10 is a partial configuration diagram of the present invention.
11 is an operation explanatory diagram of the voltage control device of the present invention.
12 is an explanatory diagram for an embodiment of a two-stage voltage regulator of the present invention.
13 is an explanatory diagram for another embodiment of a two-stage voltage regulator of the present invention.

Conservation voltage reduction (CVR) may be to reduce the power consumed by the load by lowering the voltage supplied to the load.

Conservation voltage drop (CVR) may be used as one of energy reduction technologies including energy consumption reduction and peak load reduction for efficient and stable power supply, and the maintenance voltage drop may be to reduce power consumption by reducing the feeder voltage. have. That is, the maintenance voltage drop (CVR) for stably and efficiently supplying power to the power distribution network can be used in an emergency such as supply-demand imbalance by lowering the voltage to reduce the size of the load, thereby reducing power consumption.

In the past, maintenance voltage drop (CVR) was mainly operated in a way that the power supply side unilaterally reduces the power consumed by consumers when peak demand occurs. However, in recent years, a new power supply source to the system including solar power or V2G has appeared, and accordingly, the load of the customer receives power from the previous power system and does not simply consume it, but energy produced or stored in the power system. can function to supply Therefore, there is a growing need to implement a voltage drop in the vicinity of the node of the power receiving system.

The voltage control device of the present invention may predict in real time the voltage fluctuations of various loads L1 to Ln connected to the power system 10 so that the voltages of the loads are within the allowable range and operated in the lowest section.

The power data or power value D30 mentioned below may mean the electric vehicle charge amount D20 when the electric vehicles EV1 and EV2 are charged (power consumption) through the electric vehicle chargers C1 and C2, and the electric vehicle EV1 When EV2) not only charges (power consumption) through the electric vehicle chargers (C1, C2) but also transmits (power supply) the electric vehicle surplus storage amount (D10) stored in the electric vehicle battery back to the electric power system 10 (power supply), the electric vehicle surplus storage capacity (D10) ) or the electric vehicle charging amount (D20).

The node including the loads L1 to Ln of the present invention may function as a power source that receives and consumes electricity from the power system 10 or, conversely, supplies electricity to the power system 10 . An embodiment of the loads L1 to Ln of the present invention may be the charging station 1000 or the electric vehicle chargers C1 and C2. A plurality of electric vehicle chargers may be provided in the charging station 1000 .

3 and 4 may be an embodiment of a power receiving system node including the charging station 1000 or the electric vehicle chargers C1 and C2 of the present invention.

Referring to FIG. 3 , the charging station 1000 may include the switchboard 100 or may serve as the switchboard 100 according to an embodiment. In this case, the loads L1001 and L1002 at the end of the power receiving system may include the electric vehicle chargers C1 and C2 disposed in the charging station 1000 .

Accordingly, the charging station 1000 and the switchboard 100 or the loads L1001 and L1002 and the electric vehicle chargers C1 and C2 mentioned below may be used interchangeably with the same meaning or embodiment.

The electric vehicle chargers C1 and C2 may be provided in a plurality of group charging places in a specific area in the form of a charging station 1000, and may be provided in a building including a company or a parking lot of a collective building, including a house It can be arranged at each customer's home. The owner of the electric vehicle chargers C1 and C2 may be a manager, and may be an individual, a corporation, an electric vehicle (EV) rental company, or a customer including an electric taxi. Accordingly, the electric vehicle chargers C1 and C2 may include a private non-public charger or a public charger.

The manager may be an operating subject of the management server 400 , and may be a subject controlling the electric vehicle chargers C1 and C2 , and the manager may be a charging station 1000 or electric vehicle charger in each region through the management server 400 . (C1, C2) can be managed.

Referring to FIG. 4 , the node of the power receiving system in which the management server 400 controls the voltage of the power system 10 may include, for example, a switchgear or a charging station. In FIG. 4 , the configuration of one electric vehicle charger connected to the first voltage adjusting unit provided in the switchgear may mean a non-public charger installed in each individual customer's house.

Hereinafter, an example of issuing a voltage control command to the voltage control unit included in the charging station 1000 will be described, but this may be extended to include a switchboard connected to a home of a private customer.

The predicted voltage calculator 420 of the present invention may calculate the predicted voltage based on the predicted electric vehicle charging amount D20 of the charging station 1000 or the electric vehicle chargers C1 and C2, and adjust using the predicted voltage. The voltage calculator 440 may calculate an adjustment voltage, and the controller 460 may control the voltage of the charging station 1000 to be operated as a recommended voltage included in an optimal voltage range.

The predicted voltage or the adjustment voltage may be calculated as a direction or tendency including voltage drop, voltage maintenance, and voltage rise, or may be calculated as a specific value.

That is, the control voltage that the controller 460 lowers to the voltage adjusters 210 and 220 indicates the direction or tendency of a voltage including a voltage drop, voltage maintenance, or voltage rise, or a voltage drop, voltage maintenance, or voltage rise. It may include specific values.

The direction of the regulating voltage can be determined by comparing the predicted voltage with the optimal operating interval for the maintenance voltage drop (CVR). The predicted voltage can be expressed in a direction including voltage drop, voltage maintenance, or voltage rise compared to the optimal operating section, and the adjustment voltage includes voltage drop, voltage maintenance, or voltage rise to the recommended voltage included in the optimal operating section. It can be expressed in the direction of

When the predicted voltage is calculated as a voltage drop, the adjustment voltage may be controlled by increasing the voltage, if the predicted voltage is calculated by maintaining the voltage, the adjustment voltage may be controlled by maintaining the voltage, and when the predicted voltage is calculated as the voltage drop, the adjustment voltage The voltage can be controlled by increasing the voltage.

5 and 6 may illustrate a case in which electric power is consumed in the loads L1001 and L1002 through charging of the electric vehicles without considering the back-transmission by the electric vehicles EV1 and EV2. 5 may show the predicted voltage or the adjustment voltage in the direction, and FIG. 6 may show the predicted voltage or the adjustment voltage as a specific numerical example.

The electric vehicle charging amount D20 may be calculated as one of more, normal, and small compared to the reference value. The reference value of the electric vehicle charging amount D20 may be an average charging amount, and may be set by the controller 460 . Also, an optimal operating period serving as a reference for voltage drop, voltage maintenance, or voltage rise of the predicted voltage may be set by the controller 460 .

The control unit 460 may generate a load prediction model that calculates a recommended voltage within an optimal operating period for a maintenance voltage drop (CVR) using past power data of the loads L1001 and L1002 included in the power receiving system node ( S200). The load prediction model of the present invention may include all a series of processes from past power data to recommended voltage calculation. That is, the load prediction model is the electric vehicle surplus storage amount D10 of each load L1001 and L1002 stored in the data storage unit 600 or collected in the data collection unit 500, or past power including the electric vehicle charge amount D20. The data can be used to calculate future power data.

Accordingly, the high, normal, or small amount of electric vehicle charge D20 may be a prediction result or calculation result of the future electric vehicle charge amount D20 predicted by the load prediction model from the past electric vehicle charge amount D20.

When the electric vehicle charge amount D20 is calculated to be greater than a reference value such as an average charge amount, the predicted voltage may be calculated as a voltage drop or voltage maintenance, and the adjustment voltage may be controlled by a voltage increase or voltage maintenance.

When the electric vehicle charge amount D20 is calculated to be less than a reference value such as an average charge amount, the predicted voltage may be calculated by increasing the voltage or maintaining the voltage, and the adjustment voltage may be controlled by decreasing the voltage or maintaining the voltage.

Accordingly, when the power consumption in the loads L1001 and L1002 due to charging of the electric vehicle increases, the voltage of the charging station 1000 may decrease. That is, the predicted electric vehicle charging amount D20 and the predicted voltage may tend to be inversely proportional.

When the electric vehicle charge amount D20 is calculated as normal, which is the same as or close to the reference value such as the average charge amount, the predicted voltage may be calculated by maintaining the voltage, and the adjustment voltage may also be controlled by maintaining the voltage.

The voltage maintenance is performed when the predicted voltage of the charging station 1000 included in the power receiving system node falls or rises, but there is no need to adjust the voltage due to the low degree of fall or rise, or when the lowered or raised predicted voltage is the maintenance voltage drop ( It may include a case included in the optimal operating period for CVR).

Hereinafter, a case in which the load (L1001, L1002) at the end of the power receiving system node can transmit power to the power system 10 will be described with reference to FIGS. 7 and 8 .

The voltage control device of the present invention can utilize the batteries of electric vehicles (EV1, EV2) like an energy storage system (ESS), and is used as a storage device for surplus power when the power demand is low and the power supply is excessive. In spite of this, you can get the effect of deducting or receiving expenses on the contrary.

Referring to FIG. 3 , loads L1001 and 1002 may include electric vehicle chargers C1 and C2 as well as electric vehicles EV1 and EV2 of customers using electric vehicle chargers. In this case, the electric vehicle (EV1, EV2) from the load (L1001, L1002) to the charging station 1000 including the voltage adjustment unit (210, 220) commanded to be controlled by the control unit 460 of the management server 400 to the adjustment voltage or recommended voltage (EV1, EV2) The electric vehicle surplus storage amount D10 stored in may be transmitted.

In this case, there may be a problem in each customer's choice as to whether or not to return the electric vehicle surplus storage amount (D10). It is assumed that the situation is freely supplied to the electrical system (10).

When the load (L1001, L1002) returns the electric vehicle surplus storage amount (D10), the voltage of the power receiving system node may increase, and the manager of the charging station 100 or electric vehicle charger (C1, C2) maintains the voltage drop (CVR) It is necessary to consider the electric vehicle surplus storage amount (D10) of these loads (L1001, L1002) for management or operation using

Accordingly, in the past power data D30 collected from the loads L1001 and L1002 of the present invention, the electric vehicle surplus storage D10 produced by the loads L1001 and L1002, or the electric vehicle charge amount consumed by the loads L1001 and L1002 (D20) may be included.

Accordingly, the recommended voltage at which the voltage adjuster 210 of the charging station 1000 is controlled may be determined by reflecting the electric vehicle surplus storage amount D10 and the electric vehicle charging amount D20 .

The predicted voltage of the charging station 1000 may be obtained by the predicted voltage calculator 420 , and the predicted voltage may be a future surplus storage amount predicted from the electric vehicle surplus storage amount D10 , or a future predicted from the electric vehicle charge amount D20 . It can be calculated from the electric vehicle charging amount.

When generating the load prediction model of the present invention (S200), which will be described later, the voltage change for each load reflected includes the surplus storage amount of the future electric vehicle or the charge amount of the future electric vehicle, so that the predicted voltage or the adjusted voltage may be calculated.

The present invention provides a univariate prediction method for predicting future power data using past power data (D30) as an input value, or multivariate prediction for predicting future power data including factors such as time and customer arrival rate in addition to past power data (D30) method is available.

The predicted voltage calculator 420 may calculate the predicted voltage using the surplus storage amount of the future electric vehicle or the charge amount of the electric vehicle in the future. The adjustment voltage calculator 440 may calculate the adjustment voltage to be a recommended voltage included in the optimal operating period for the maintenance voltage drop (CVR).

The adjustment voltage applied by the controller 460 to the voltage adjustment unit of the charging station 1000 may indicate a direction or tendency of a voltage including a voltage drop, a voltage maintenance, or a voltage increase.

FIG. 7 may be an embodiment showing the direction or tendency of the adjustment voltage, and FIG. 8 may be another simplified embodiment of FIG. 7 .

Referring to FIG. 7 , the direction or tendency of the future electric vehicle surplus storage amount and the future electric vehicle charge amount may be indicated by at least one of very low, low, maintenance, high, or very high, respectively, with respect to a reference value. As an example of the reference value, an average surplus storage amount that is a reference value compared to a future electric vehicle surplus storage amount, or an average charge amount that is a reference value of a future electric vehicle charge amount may be set by the controller 460 .

For example, if the electric vehicle surplus storage is predicted to be higher than the average surplus storage and the electric vehicle's charge is low compared to the average charge, additional power is supplied to the grid, which may cause overvoltage, so voltage adjustment may be required. This corresponds to a case where the surplus storage amount of the future electric vehicle is high and the charge amount of the future electric vehicle is low, and the predicted voltage may be a voltage increase, and the adjustment voltage may be a voltage decrease.

The remaining cases will be described in this way.

When the surplus storage amount of the future electric vehicle is low and the charge amount of the future electric vehicle is high, the predicted voltage may be a voltage drop, and the adjustment voltage may be a voltage increase.

Accordingly, when the predicted surplus storage amount of the electric vehicle and the predicted electric vehicle charge amount have opposite directions to either low or high as in the above two cases, the predicted voltage may be a voltage drop or a voltage increase. In addition, when the predicted electric vehicle surplus storage amount and the predicted electric vehicle charge amount have opposite directions to either low or high, the direction of the predicted voltage may be determined in proportion to the direction of the electric vehicle surplus storage.

When the surplus storage amount of the future electric vehicle is low and the charge amount of the future electric vehicle is maintained, the predicted voltage may be a voltage drop or a voltage maintenance, and the adjustment voltage may be a voltage increase or a voltage maintenance. In this case, the voltage maintenance may include a case in which voltage adjustment is not necessary due to a drop in voltage, but the degree of the drop is small, or a case in which a lowered predicted voltage is included in the optimal operating period.

When the surplus storage amount of the future electric vehicle is high and the charge amount of the future electric vehicle is maintained, the predicted voltage may be a voltage increase or a voltage maintenance, and the adjustment voltage may be a voltage decrease or a voltage maintenance. In this case, the voltage maintenance may include a case in which voltage adjustment is not necessary because the voltage is increased but the degree of increase is small, or a case in which the increased predicted voltage is included in the optimal operating period.

Accordingly, as in the above two cases, when one of the predicted electric vehicle surplus storage amount or the predicted electric vehicle charge amount is low or high and the other is maintained, the predicted voltage is proportional to the calculated low or high It can be determined by or .

When the surplus storage amount of the future electric vehicle is low and the charge amount of the future electric vehicle is low, the predicted voltage may be a voltage drop, a voltage maintenance, or a voltage increase, and the adjustment voltage may be a voltage increase, a voltage maintenance, or a voltage drop.

When the future electric vehicle surplus storage amount is high and the future electric vehicle charge amount is high, the predicted voltage may be a voltage drop, a voltage maintenance, or a voltage increase, and the adjustment voltage may be a voltage increase, a voltage maintenance, or a voltage drop.

Therefore, when the predicted surplus storage amount of the electric vehicle and the predicted electric vehicle charge amount have the same direction as described above, the voltage drop, voltage maintenance, or voltage increase are all possible by the relative comparison of the predicted electric vehicle surplus storage amount and the predicted electric vehicle charge amount. can In this case, high may be further subdivided and displayed as very high and high, and low may be further subdivided and displayed as very low and low.

For example, when the surplus storage amount of the future electric vehicle is very high and the charge amount of the future electric vehicle is high, the predicted voltage may be a voltage increase and the adjustment voltage may be a voltage decrease.

When the surplus storage amount of the future electric vehicle is high and the charge amount of the future electric vehicle is very high, the predicted voltage may be a voltage drop. When the surplus storage amount of the future electric vehicle is low and the charge amount of the future electric vehicle is very low, the predicted voltage may be a voltage increase.

When the surplus storage amount of the future electric vehicle is very low and the charge amount of the future electric vehicle is low, the predicted voltage may be a voltage rise, and the adjustment voltage may be controlled by a voltage drop. This may be because, when the amount of surplus storage of electric vehicles is low, the voltage change due to the change in the amount of electric vehicle charge itself may appear larger than the relationship between electric vehicle surplus storage and electric vehicle charge. Also, the direction of voltage change and the amount of electric vehicle charge may tend to move in opposite directions. Therefore, when the surplus storage amount of the electric vehicle is very low and the electric vehicle charge amount is low, the probability that the predicted voltage becomes a voltage increase may increase.

FIG. 5 may further simplify FIG. 4 to determine the tendency of the predicted voltage in comparison with each other without setting reference values for each of the surplus storage amount of the future electric vehicle and the charge amount of the future electric vehicle.

When the predicted electric vehicle surplus storage amount is lower than the predicted electric vehicle charge amount, the predicted voltage may be a voltage rise, a voltage hold, or a voltage drop, and the adjustment voltage may be controlled by a voltage drop, a voltage hold, or a voltage rise. In this case, the voltage maintenance may include a case in which voltage adjustment is not necessary due to a drop in voltage, but the degree of the drop is small, or a case in which a lowered predicted voltage is included in the optimal operating period.

When the predicted surplus storage amount of the electric vehicle is the same as the predicted electric vehicle charge amount, the predicted voltage may be voltage maintenance.

When the predicted electric vehicle surplus storage amount is higher than the predicted electric vehicle charge amount, the predicted voltage may be voltage maintenance or voltage increase. In this case, the voltage maintenance may include a case in which voltage adjustment is not necessary because the voltage is increased but the degree of increase is small, or a case in which the increased predicted voltage is included in the optimal operating period.

Hereinafter, the remainder of the present invention will be described.

The power supplied from the power system 10 may be distributed to each node of the power receiving system including the loads L1 to Ln through the power distribution panel 100 through the power line 30 .

The power distribution panel 100 may distribute the power supplied from the power system 10 to nodes of the power reception system including the loads L1 to Ln. The main measurement device 300 may measure the power status of the switchboard 100 and the individual power status of nodes connected to the switchboard 100 . The first voltage adjusting unit 210 receives the recommended voltage for the maintenance voltage drop (CVR) from the control unit 460 of the management server 400 and adjusts the voltage of the switchboard 100 or the voltage of the power receiving system nodes L1 to Ln. can be controlled

1 and 2, in the structure of the voltage regulator of the voltage control device of the present invention, a plurality of individual loads are connected to one power receiving system node, and the first voltage adjusting unit 210 is disposed at the common power receiving system node. , or a case in which a second voltage adjuster 220 is disposed for each of the plurality of individual loads in addition to the first voltage adjuster 210 .

In the former structure of the first-stage voltage adjuster 210, the first voltage adjuster 210 exists above the loads L1 to Ln, so when the voltage is adjusted, the voltages of all loads may fluctuate at the same rate at the same time. have. Each of the load nodes L1 to Ln may have different voltage distributions due to a distance from the first voltage adjusting unit 210 and characteristics of the device. Accordingly, the control command issued by the controller 460 to the first voltage adjuster 210 may reflect all the power conditions of the power receiving system node connected to the first voltage adjusting unit 210 . For example, when it is determined that the first load L1 is a voltage drop and it is determined that the second load L2 is a voltage increase, the controller 460 may lower the voltage maintenance to the first voltage adjuster 210 .

In addition, the voltage control device of the present invention can induce a more stable voltage distribution by controlling the voltage fluctuations in the future rather than adjusting the voltage only with the current power state.

Therefore, the voltage control device of the present invention predicts the voltage of each node, looks at the future voltage pattern, estimates the adjustable voltage, and finally the controller 46 applies the recommended voltage to the first voltage adjuster 210 . can send The recommended voltage may be within the allowable range for facility operation of each node. If the equipment of the node including each load (L1 ~ Ln) is operated outside the allowable voltage range, the life of the equipment may be shortened or the possibility of failure may increase.

In the latter two-stage structure of the voltage adjusting units 210 and 220 , the management server 400 may include at least one of the predicted voltage calculating unit 420 , the adjusted voltage calculating unit 440 , and the controlling unit 460 . The voltage control device of the power receiving system node of the present invention may include at least one of the switchgear 100 , the first voltage adjusting unit 210 , the second voltage adjusting unit 220 , and the main measuring device 300 .

Although there are several loads L1 to Ln having different voltage distributions, the voltage adjusting unit 210, which is a voltage adjusting device capable of adjusting them, may exist only in the upper stage. When each of the loads (L1 ~ Ln) is viewed as a child, the voltage regulator may exist in the parent's position. In this case, one load has to drop the voltage for high voltage and the other load needs to increase the load for low voltage, but controlling with the voltage regulator present at the parent location will cause the problem that the two loads cannot be adjusted to the optimum range. can

In order to prevent this problem, the voltage control device of the present invention separately controls the voltage of each of the power receiving system nodes L1 to Ln in addition to the first voltage adjusting unit 210 included in the power distribution panel 100 or disposed nearby. It is possible to perform a more precise and safe preservation voltage drop (CVR) with a two-step structure including the second voltage adjusting units 220 , 221 , 222 that can do it.

Accordingly, the second voltage adjusters 220 , 221 , and 222 may be located at the end of the power receiving system than the first voltage adjusting unit 210 , and may be closer to the receiving system node. That is, the first voltage adjusting unit 210 may be located at one of the parent nodes of the power receiving system than the second voltage adjusting unit 220 , 221 , and 222 , and the second voltage adjusting unit 220 , 221 , 222 of the power receiving system than the first voltage adjusting unit 210 . It can be located on one of the child nodes.

The voltage control device of the present invention may predict voltage fluctuations of individual loads L1 to Ln and calculate a voltage or direction to be adjusted in order to operate at an optimal voltage.

The high voltage or low voltage of the load in the following embodiment is the optimal operating period calculated by determining the optimum to perform the predicted voltage by machine learning of each load (L1 to Ln) and the maintenance voltage drop (CVR) of the power receiving system node facility It may be due to comparison with

For example, when there are two loads, the first load L1 is predicted to have a high voltage of 220V, and the second load L2 is the first load L1 that adjusts the first load L1 when a low voltage (compared to the optimal voltage) of 208V is predicted. The 2-1 voltage adjuster 221 lowers the voltage of the first load L1 , and the 2-2 voltage adjuster 222 adjusts the second load L2 increases the voltage of the second load L2 . can be controlled to do so. Such voltage adjustment may be performed with only a direction or trend, such as rising and falling, or specific values such as 8V falling and 3V rising.

As an embodiment of the predicted voltage and the adjusted voltage of the present invention, FIG. 12 may show the adjustment voltage of the voltage adjusters 210 and 220 in a direction or tendency including a drop, a maintenance, or a rise, and FIG. 13 shows the predicted voltage and The adjustment voltage may be expressed as a specific numerical value. 13 may be a case in which the load of the power receiving system node is a nominal voltage of 220V for home use, and may be a case in which the optimal operating period of the node is set to 210~213V. 12 and 13 , the switchgear 100 , the first load L1 , and the second load L2 may be included in a node of a customer or a location.

A relationship between the predicted voltage and the adjustment voltage will be described in detail with reference to FIGS. 12 and 13 . 12 and 13 are examples of a case in which there are two loads, but the discussion may be extended to a case in which there are three or more loads.

The control unit 460 may lower the recommended voltage to the control adjustment units 210 and 220 for the maintenance voltage drop (CVR). The recommended voltage may be included in the optimal operating period, and the difference between the predicted voltage and the recommended voltage may be the adjustment voltage.

The recommended voltage may be expressed as a direction or tendency of a voltage change including voltage drop, voltage maintenance, or voltage rise, or the recommended voltage may be expressed as a specific value including 12V drop, voltage hold, or 9V rise.

The node of the upper layer may be the switchgear 100 , and the voltage of the node of the upper layer may be controlled by the first voltage adjusting unit 210 . The node of the lower layer may be the first load L1 and the second load L2 , and the voltage of the node of the lower layer may be controlled by the second voltage adjuster 220 , and the voltage of the first load L1 . The voltage of the second-first voltage adjuster 221 and the second load L2 may be controlled by the second-second voltage adjuster 222 .

First, consider the case in which the recommended voltage is expressed as the direction or tendency of the voltage change of the power receiving system node.

Examples of recommended voltages may be classified according to predicted voltages of nodes of all lower layers connected to nodes of higher layers. For example, in the first case where the predicted voltages of the first load L1 and the second load L2 both have the same tendency as low voltage or high voltage, the predicted voltages of the first load L1 and the second load L2 One of them is a high voltage and the other is a low voltage. In the second case having different tendencies, or one of the predicted voltages of the first load L1 and the second load L2 is a voltage maintenance and the other is a high voltage or a low voltage A third case can be distinguished.

In the first case, the first voltage adjuster 210 may be controlled to have a tendency opposite to the predicted voltages of the first load L1 and the second load L2, and the 2-1 voltage adjuster 221 and the second The 2-2 voltage adjusting unit 222 may be controlled by maintaining the voltage.

For example, when the predicted voltages of the first load L1 and the second load L2 are both low voltages, both the 2-1 voltage adjuster 221 and the 2-2 voltage adjuster 222 operate to operate the first The voltages of the load L1 and the second load L2 can be controlled, but the first load L1 and the second load L2 are controlled at the same time by controlling the first voltage adjuster 210 of the parent node. could be more efficient. Accordingly, the first voltage adjuster 210 may be controlled by increasing the voltage, and the 2-1 voltage adjusting unit 221 and the 2-2 voltage adjusting unit 222 may be controlled by maintaining the voltage.

In the second case, the first voltage adjuster 210 may be controlled by maintaining the voltage, and the first load L1 to which the 2-1 voltage adjuster 221 and the 2-2 voltage adjuster 222 are respectively connected; It may be controlled to have a tendency opposite to that of the second load L2.

For example, when the first load L1 has a high voltage compared to the optimal operating period and the second load L2 has a low voltage compared to the optimal operating period, the first voltage adjuster 210 may be controlled to maintain the voltage, The 2-1 voltage adjuster 221 may be controlled by a voltage drop, and the 2-2 voltage adjuster 222 may be controlled by a voltage rise.

In the third case, the first voltage adjusting unit 210 may be controlled to maintain a voltage, and the second voltage adjusting unit 220 connected to the voltage maintaining side among the first load L1 and the second load L2 is the voltage The maintenance may be controlled, and the second voltage adjusting unit 220 connected to the high voltage or low voltage of the first load L1 and the second load L2 may be controlled to have an opposite tendency to the connected load.

For example, when the first load L1 is a low voltage and the second load L2 is a voltage maintained, the first voltage adjuster 210 may be controlled to maintain the voltage, and the 2-1 adjustment voltage unit 221 ) may be controlled by increasing the voltage, and the 2-2 regulating voltage unit 222 may be controlled by maintaining the voltage.

When the recommended voltage is displayed as a specific value of the voltage change of the power receiving system node, the voltage adjustment of the voltage adjusters 210 and 220 including voltage drop, voltage maintenance, or voltage rise compared to the case where the recommended voltage is displayed as the direction or tendency of the voltage change The direction may be the same.

There may be no difference between the numerical display and the trend display when determining whether to maintain the voltage, and a specific adjustment value may be presented when the voltage is lowered or the voltage is increased.

The controller 460 may transmit a voltage control command such that the recommended voltage is included within the optimal operating period when the voltage adjusting unit for voltage drop or voltage rise is determined by the determination of the first to third cases.

Specifically, when the voltage rise or the voltage drop of the second voltage adjusters 221 and 222 is determined, the controller 460 specifically controls the recommended voltage of each of the loads L1 and L2 for which the voltage rise or voltage drop is determined to be included within the optimal operating period. The predicted voltage and the regulated voltage can be calculated for each load, respectively.

For example, when the optimal operating period is 210 to 213V, the first load L1 is a high voltage with a predicted voltage of 220V, and the second load L2 has a low voltage with a predicted voltage of 220V, the first voltage adjuster 210 is controlled by maintaining the voltage The 2-1 voltage adjusting unit 221 may be set to be included in the optimal operating period with a recommended voltage of 212V by controlling the voltage drop to the adjustment voltage -8V, and the 2-2 voltage adjusting unit 222 may be adjusted It can be set to be included in the optimal operating period with a recommended voltage of 211V by controlling the voltage rise to +3V.

As in the first case, when the first voltage adjuster 210 is controlled to drop or rise in voltage, the first load L1 and the second load that are all lower nodes connected to the first voltage adjuster 210 as the upper node. The first voltage adjusting unit 210 may be controlled so that all of the recommended voltages of L2 are included in the optimal operating period.

For example, when the optimal operating period is 210 to 213V, the predicted voltage of the first load L1 is 225V, and the predicted voltage of the second load L2 is 223V, the high voltage, the second voltage adjusting unit 220 is The voltage may be controlled by maintaining the voltage, and the first voltage adjusting unit 210 may be controlled by the voltage dropping. In this case, the adjustment voltage of the first load L1 may be preferably determined within 12 to 15V, and the adjustment voltage of the second load L2 may preferably be determined within 10 to 13V. Therefore, it may be desirable to control the voltage of the first voltage adjuster 210 to drop within 12 to 13V in which the adjustment voltage ranges of the two loads L1 and L2 overlap.

An optimal operating period for the maintenance voltage drop (CVR) may be set ( S100 ), and the recommended voltage may be included in the optimal operating period. Accordingly, the recommended voltage may be a value or a section within the optimal operating section. The first voltage adjusting unit 210 may adjust the system voltage with the received recommended voltage.

The lowest voltage within the allowable range may be included in the optimal operation section, and if the equipment of each node is operated with the lowest voltage within the allowable voltage range, a conservation voltage drop (CVR) effect can be obtained.

On the power supply side that supplies or distributes power to the power system 10, like KEPCO, it supplies power to the power system or when necessary, a power exchange that can issue a demand response (DR, demand request), or a power exchange produced by A power plant that supplies power may be included.

The side receiving or receiving power from the power system 10 can perform real-time reduction control and remote management in relation to the power consumer or the consumer, and recruit, register, or manage demand resources in relation to the power exchange. A demand management business operator with The consumer may be the subject of power consumption and may be the subject of a new supply source that supplies power to a system including solar power or electric vehicles. A consumer may be an owner or a user of each load L1 to Ln of the present invention, and may belong to an individual consumer in a group unit including a plurality of loads. The demand management business operator is located between the power supply side and the consumer based on the power system 10 , and can control the power supplied by the consumer through the power system 10 .

The voltage control device of the present invention may be to control the node of the power receiving system by the demand management company. The node of the power receiving system is the switchgear 100, the voltage adjusting unit 210,220, the main measuring device 300, the data collecting unit 500, the data storage unit 600, or a measuring device equipped with each load (L1 to Ln) ( L1a to Lna) may mean at least one.

It is important to accurately calculate the voltage of the node for each load of the power consumer. The power consumer may mean a subject that receives the power distributed from the switchboard, and the location may mean a place that receives the power distributed from the switchboard, but the power consumer and the location may be used interchangeably.

The power consumer may send and receive electricity from the power system 10 , and the power consumer may receive electricity from the power system 10 through the power distribution panel. The electricity distributed from the switchgear may be distributed to the loads L1 to Ln of each location.

The number of switchgear may increase according to the complexity of the loads L1 to Ln, and the switchboard 100 may include a first switchboard or a second switchboard. The first switchgear may be provided before being distributed from the power system 10 to each location. The drawing may show only the first switchboard among the switchboards.

The first switchgear may be the first switchboard encountered among the power paths from the power system 10 to the loads L1 to Ln, and the second switchboard is from the power system 10 to the loads L1 to Ln among the power paths. It may be a switchgear that directly distributes power to the loads (L1 to Ln).

In the first switchgear or the second switchgear, ACB (Air Circuit Breaker), which is a power breaker using air of a low-voltage power circuit, VCB (Vacuum Circuit Breaker), which is a power breaker using vacuum of a high-voltage power circuit, A Potential Transformer (PT) capable of measuring various electrical data by lowering it, or a Current Transformer (CT) capable of measuring current data by converting a current of a large current circuit into a small current may be included.

When the first switchgear is a higher layer closer to the power system than the second switchgear, the first switchgear may include a VCB and the second switchboard may include an ACB. That is, both VCB and ACB are breaker, VCB can use vacuum as the internal medium of the breaker, can be used on the high-voltage side that is the primary side of the transformer, ACB can use air as the internal medium of the transformer, and the secondary side of the transformer Or it can be used on the large load (L1 ~ Ln) side.

Therefore, the demand management business operator can control the power through the first switchgear and the second switchgear, and can manage the total demand of the target power consumers by grasping the power status of the load in real time.

When the complexity of the loads L1 to Ln is increased, a third switchboard may be provided between the first switchboard and the second switchboard. A transformer may be provided between the power system 10 and the third switchboard, and a separate transformer may be provided between the second switchboard and the third switchboard. The transformer 50 may be provided between the power system 10 and the first switchboard or between the first switchboard and the third switchboard. In order to reduce power loss due to low voltage transmission, the second transformer formed between the third switchgear and the second switchgear may be installed close to the second switchgear.

For example, if the transformer 50 is installed before being connected to a node located at the end of the system and the node is for an industrial factory, the transformer 50 receives a primary input of 6.6KV and converts the secondary output to 380V. . In addition, when the transformer 50 is a higher layer than the system terminal, the transformer 50 may receive a primary input of 22.9KV and convert the secondary output to 6.6KV. As such, the transformer 50 may refer to one of the transformer facilities installed before the switchboard 100 for distributing power.

In Embodiment 1 of the present invention, power data for each load L1 to Ln may be transmitted to the switchboard 100 . The transmitted power data of each load (L1 to Ln) is to be transmitted to the management server 400 through the communication line 40 together with the power data of the main measurement device 300 for measuring the overall power condition of the switchgear 100. can

Installing one expensive power analyzer at each location can be expensive, so install inexpensive measuring devices (L1a to Lna) in all places where measurements such as loads (L1 to Ln) and switchboards are required to collect power data Costs can be reduced to collect and analyze. The present invention can provide a method for collecting data without affecting the operation by employing sensors capable of uninterrupted operation in installing the measurement devices L1a to Lna.

Therefore, according to the second embodiment of the present invention, the measuring devices L1a to Lna may be installed in all the loads L1 to Ln in each location and in all the switchgears. Since power data can be collected at high speed using real-time measurement information in seconds or minutes of these measuring devices L1a to Lna, the present invention can simultaneously grasp demand resources including real-time voltage conditions of each location, and Through this, it is possible to accurately analyze the total demand resource status of the targeted electricity consumers.

Power data of the node including the switchgear 100 and the loads L1 to Ln may be collected by the data collection unit 500 through the communication line 40 . For example, power may be supplied to each of the loads L1 to Ln through the switchboard 100 , and all of the measuring devices L1a to Lna may be provided in each of the loads L1 to Ln. The power data of the measuring devices (L1a to Lna) connected to the switchboard 100 and the power data of the measuring devices (L1a to Lna) connected to the loads (L1 to Ln) supplied with electricity from the switchboard 100 are data collection unit ( 500) can be sent.

The power data collected by the data collection unit 500 may be transmitted to the management server 400 through wireless communication through a communication modem. Accordingly, all power data of each load L1 to Ln may be transmitted to the management server 400 .

A data storage unit 600 capable of storing past power data collected by the data collection unit 500 may be provided. The load prediction model of the present invention may calculate future power prediction data using past power data of each load L1 to Ln stored in the data storage unit 600 .

When the management server 400 continuously receives power data from a node of the power reception system in real time, the data collection unit 500 and the data storage unit 600 may be included in the management server 400 . When the management server 400 intermittently receives power data from the node of the power receiving system only when the maintenance voltage drop is required, the data collection unit 500 and the data storage unit 600 may be included in the power consumer or location.

In the case of the first embodiment disclosed in FIG. 1 , the data collection unit 500 and the data storage unit 600 may be included in the management server 400 , and in the case of the second embodiment disclosed in FIG. 2 , the data collection unit 500 and the data storage unit 500 . The storage unit 600 may be included in a power consumer or location separately from the management server 400 .

In the case of Embodiment 1, the consumer can simplify data management by simply performing and measuring the voltage control command and transmitting all continuously generated power data to the management server 400 . In the case of Embodiment 2, if the power data transmitted to the management server 400 is too large depending on the number of loads, traffic induction or delay problems may occur. ) and the data storage unit 600 , and transmit power data to the management server 400 when a necessary event such as a voltage drop for maintenance occurs to dualize data management.

When controlling the nodes of the power receiving system based on only the current voltage without knowing how the future voltage distribution will be distributed, the current voltage of each node is higher than the optimal operating section, so the voltage is adjusted. Doing so may result in lower than optimal operating intervals and pose a low voltage hazard.

That is, a situation may arise in which optimal control cannot be performed because the aspect of the future voltage cannot be grasped. In this case, maintaining may be an optimal control method that can extend the lifespan of the voltage regulating device as well as the voltage stabilization effect.

Therefore, the voltage control device of the present invention can stably operate the voltage within the optimal operating period in consideration of the future voltage distribution by predicting the voltage of the loads L1 to Ln. In other words, in order to minimize losses due to undervoltage and overvoltage caused by voltage regulation based on the current voltage, voltage stabilization is achieved using a method of predicting future voltage, and the conservation voltage drop (CVR) is maintained by maintaining the lowest voltage within the allowable range. ) can be obtained.

The voltage control device of the present invention may include a management server 400 that receives power data of a power receiving system node and transmits a recommended voltage to the first voltage adjuster 210 capable of controlling the voltage of each node.

Since the voltage or power of each node in the power receiving system fluctuates in real time, adjusting the voltage based on the present may cause problems in the future. It was determined that the voltage should be raised based on the current, and the voltage was raised. If the voltage rises due to a change in power usage, the voltage may need to be lowered again. In this case, it may cause overvoltage due to voltage regulation. In other words, it may not operate optimally if future power conditions are not taken into account.

The controller 460 may generate a load prediction model that calculates a recommended voltage for the maintenance voltage drop CVR by using the past power data of the loads L1 to Ln ( S200 ). The load prediction model may include all a series of processes from the past power data to the recommended voltage calculation.

When several loads exist in the power system 10 , the voltage may be different for each load due to the characteristics and distance of the load. And the node of the power receiving system including the load may have a condition to be operated in an allowable voltage range. Operating outside the permissible voltage range may shorten the life of the node equipment and increase the likelihood of failure.

The present invention can obtain a conservation voltage drop effect when operated at the lowest voltage within the allowable voltage range. Even if the voltage of the node is lowered by the reduced recommended voltage, the operation of the equipment of the node may not be affected. Consumers or consumers can save on electricity bills by reducing the power by lowering the voltage.

If you know the future voltage in order to maintain the voltage of the facility in the low-voltage section, you can respond in advance so that it can be operated stably in the low-voltage section. If the voltage is adjusted based on the current, an overvoltage or undervoltage that would not have occurred without the adjustment may occur. Therefore, the predicted voltage calculator 420 calculates the voltage fluctuation of the load in consideration of the future voltage to adjust the voltage. can be predicted in real time (S220).

Each past power data of the node may be transmitted from the data collection unit 500 or the data storage unit 600 to the predicted voltage calculation unit 420 .

In order to predict or estimate the maintenance voltage drop (CVR) from the power data measured in the past, appropriate maintenance voltage drop data may be required. The data for the maintenance voltage drop (CVR) may provide information including at least one of a voltage, an active power, a reactive power, and a tap position for each predetermined time unit. Data measured by load has a small amount of data and is relatively easy to process, and data reconstruction can be minimized by providing data for each time period, so it can be data suitable for estimating the maintenance voltage drop (CVR) in terms of data accuracy and program efficiency. Due to the characteristics of measurement data, partial data correction may be required in case of data leakage.

The controller 460 may set an allowable voltage range suitable for the operation of the node facility, and the controller 460 may set an optimal operating section included in the allowable voltage range (S100). Since the optimal operation section is for power consumption reduction, it may be included in a lower section of the allowable voltage range.

The machine learning method used by the prediction voltage calculator 420 to predict the voltage of the loads L1 to Ln includes a kernel regression, an autoregressive model (AR), or a moving average model (MA). ) may be included.

Hereinafter, in machine learning, a current value or a current voltage value may mean a value that can be calculated or predicted through machine learning from past power data.

Kernel regression may be a non-parametric technique for estimating conditional expectations of a random variable, and the goal may be to find a non-linear relationship between a pair of random variables X and Y. Kernel regression may be to find the conditional expected value of variable Y with respect to variable X in nonparametric regression.

This can be expressed by Equation 1 as follows.

X may be an input value and Y may be a target value. In the time series prediction, X may be a voltage value included in the past power data as a past history of a node including a load, and Y may be a current voltage or a future predicted voltage of the node. E may be a symbol representing an expected value, and | may indicate a condition. That is, E(Y|X=x) may represent an expected value of Y when X=x.

m is a function representing a non-linear relationship between X and Y, and may be a value that should be estimated through past power data. An embodiment of a method for estimating the function m is as follows.

은 데이터를 통해 추정된 함수 m을 의미할 수 있고, x에 근접한 데이터를 이용한 가중 평균을 의미할 수 있다. K(x-xi)=wi라고 생각하면 수학식 2는 다음과 같이 생각될 수 있다. Wi는 가중치를 의미할 수 있고, (xi,yi)는 입력값(X), 목표값(Y)에 포함되는 샘플을 의미할 수 있다. 여기서는 x_i는 과거 전압값, yi는 현재 전압값(시간적으로 xi이후에 나타나는 값)이라 할 수 있다.

may mean a function m estimated through data, and may mean a weighted average using data close to x. Considering that K(x-xi)=wi, Equation 2 can be considered as follows. Wi may mean a weight, and (xi,yi) may mean a sample included in the input value (X) and the target value (Y). Here, x _i is a past voltage value, and yi is a current voltage value (a value that appears after xi in time).

을 wi의 함수로 표현하면, 수학식 3으로 표현될 수 있다.therefore,

Expressing as a function of wi, it can be expressed by Equation (3).

When a weight for yi exists, the weighted average of yi can be obtained through Equation (3). In kernel regression, the weight may be a kernel function K having a bandwidth (bandwith, h). The kernel function may typically be a Gaussian kernel.

Autoregressive (AR) can refer to a model in which the present value linearly depends on its past value in univariate time series analysis and has an error term. Therefore, among autoregressive models, the AR(p) model refers to a model that affects the current voltage value up to the voltage value of the past time point p, and can be expressed as follows.

Zt is a current time series value, and Zt-n is a time series value prior to n time points, and may be a past voltage value or a past power value. φp may be an error term. φp may be a coefficient of a past time series value (Zt-p), and may represent an influence on Zt. The simplest form of the AR model may be the AR(1) model, and the AR(1) model may represent the present value as a value and an error term before a point in the past. The AR(1) model can be expressed as Equation 5.

A moving average model (MA) may be a model in which the present value linearly depends on its past error value in univariate time series analysis and has an error term. Among the moving average models, the MA(p) model refers to a model that affects the present value up to the error value of the past time point p, and can be expressed as Equation (6).

에 미치는 영향력을 나타낼 수 있다. MA 모형의 가장 간단한 형태는 MA(1) 모형일 수 있고, MA(1) 모형은 과거 한 시점 전의 오차값과 현재 오차값으로 나타낼 수 있다. MA(1)은 다음의 수학식 7과 같이 표현될 수 있다. Zt may be a current time series value, and αt-n may be an error value before n time points. θp is the coefficient of the past error value (αt-p)

influence can be shown. The simplest form of the MA model may be the MA(1) model, and the MA(1) model can be expressed as an error value of one time in the past and a current error value. MA(1) can be expressed as in Equation 7 below.

The adjusted voltage calculator 440 may calculate an adjustment voltage, which is a voltage value to be adjusted, based on the predicted voltage calculated by the predicted voltage calculator 420 ( S240 ). The predicted voltage may be calculated as a value having a time interval of a preset interval, or may be calculated as an interval for a predetermined time interval.

The controller 460 may control the first voltage adjusting unit 210 to operate the node facility with the calculated recommended voltage, and the controller 460 may use the voltage adjusting units 210 and 220 to determine the recommended voltage for which the system voltage is calculated. It can be controlled remotely as much as possible.

The voltage regulators 210 and 220 may be devices provided for system voltage control or reactive power control, and may include an On-Load Tap Changer (OLTC), a Step Voltage Regulator (SVR), and a V It may include at least one of a voltage regulator, an inverter, and a (power) capacitor (SC). For example, the voltage of the power line may be raised or lowered by adjusting the on-load tap changer, and reactive power may be controlled through the input or open command to the ancestor facility of the capacitor.

For example, if the power consumer is an industrial plant, the nominal voltage may be about 380V, and in the case of a household, it may be about 220V. Hereinafter, a case where the power consumer is a household will be described as an example.

The control unit 460 may set an optimal operation period based on the equipment state of the node or past power data of the node, and the optimal operation period may be set to 210 ~ 213V. If the currently measured voltage of the node is 218V, it may be desirable to adjust it to 210~213V, which is the optimal operating period. However, the voltage adjusted according to the predicted voltage calculated by the predicted voltage calculator 420 may be determined differently.

For example, when the predicted voltage is about 218V that is the same as or close to the current voltage, the controller 460 may determine the voltage drop, and if the predicted voltage is about 213V lower than the current voltage, the controller 460 determines that the voltage is maintained. If the predicted voltage is lower than the current voltage and is about 208V, which is less than or equal to the optimal operating period, the controller 460 may determine that the voltage rises.

The controller 460 may compare the current voltage, the predicted voltage, and the optimal operating period with each other to calculate a voltage control tendency including voltage drop, voltage maintenance, and voltage rise. When calculating the voltage control tendency, the controller 460 may instruct the first voltage adjuster 210 or the second voltage adjuster 220 to operate with the recommended voltage ( S300 ). The recommended voltage may be a value included in the optimal operating period or may be calculated as a period.

10... power system 30... power line
40... Telecommunication line 50... Transformer
100... Switchboard 210... First voltage regulator
220,221,222... Second voltage regulator 300... Main measuring device
400... management server 420... predictive voltage calculator
440... Regulated voltage calculation unit 460... Control unit
500... data collection unit 600... data storage unit
L1... First load L1a... First measuring device
L2... Second load L2a... Second measuring device
Ln... n-th load Lna... n-th instrument
D10... Electric vehicle surplus storage D20... Electric vehicle charge
D30... Historical power data 1000... Charging station
L1001... First load L1002... Second load
C1... Charger for the first electric vehicle C2... Charger for the second electric vehicle
EV1... First electric vehicle EV2... Second electric vehicle

Claims (10)

The power supplied from the power system is distributed to a plurality of power receiving system nodes,
A predicted voltage calculator that receives continuous power data from the power receiving system node in real time, and calculates a predicted voltage of the power receiving system node, or an regulated voltage for calculating an regulated voltage for conservation voltage reduction (CVR) a management server including a calculator;
a voltage adjustment unit receiving the adjustment voltage and controlling the voltage of the power receiving system node; including,
The power receiving system node includes at least one of an electric vehicle charger, a switchboard controlling the voltage of the electric vehicle charger, or a charging station provided with a plurality of electric vehicle chargers,
The charging station or the electric vehicle charger can reversely transmit the electric vehicle surplus electric power stored in the electric vehicle battery to the electric power system,
In the past power data used to calculate the predicted voltage or the adjusted voltage of the charging station, the amount of electric vehicle charge consumed in the electric vehicle charger or the electric vehicle surplus storage amount that can be supplied to the electric power system through the electric vehicle charger is the electric power stored in the electric vehicle. included,
When the future electric vehicle surplus storage is lower than the future electric vehicle charge, the predicted voltage is calculated as one of voltage rise, voltage maintenance, or voltage drop,
If the future electric vehicle surplus storage is equal to the future electric vehicle charge, the predicted voltage is calculated by maintaining the voltage,
When the surplus storage amount of the future electric vehicle is higher than that of the future electric vehicle, the predicted voltage is calculated by maintaining the voltage or increasing the voltage.
The method of claim 1,
The predicted voltage calculator calculates a predicted voltage based on the predicted electric vehicle charging amount of the charging station or the electric vehicle charger,
The adjustment voltage calculator calculates an adjustment voltage using the predicted voltage,
A voltage control device provided with a controller for controlling the voltage of the charging station or the electric vehicle charger to be operated as a recommended voltage within an optimal voltage range for a maintenance voltage drop (CVR).
The method of claim 1,
A control unit for setting an optimal operating period for the maintenance voltage drop (CVR) of the charging station or the electric vehicle charger is included in the management server,
The direction of the adjustment voltage is determined by comparing the predicted voltage and the optimal operating period,
When the predicted voltage is calculated as a voltage drop, the adjustment voltage is controlled by a voltage increase, when the predicted voltage is calculated as a voltage maintenance, the adjustment voltage is controlled by a voltage maintenance, and when the predicted voltage is calculated as a voltage drop A voltage control device in which the adjustment voltage is controlled by a voltage rise.
The method of claim 1,
When the power consumption in the electric vehicle charger increases due to the electric vehicle charging, the voltage of the charging station decreases, and thus the electric vehicle charging amount and the predicted voltage have a tendency to be inversely proportional.
The method of claim 1,
The electric vehicle charging amount is calculated in one direction or tendency among many, normal, and small compared to the reference value including the average charging amount,
When it is calculated that the electric vehicle charge amount is greater than the reference value, the predicted voltage is calculated as a voltage drop or voltage maintenance, and the adjustment voltage is controlled by a voltage increase or voltage maintenance,
When the electric vehicle charge amount is calculated to be less than the reference value, the predicted voltage is calculated as a voltage increase or voltage maintenance, and the adjustment voltage is controlled by a voltage drop or voltage maintenance,
When the electric vehicle charge amount is calculated to be normal compared to the reference value, the predicted voltage is calculated by maintaining the voltage, and the adjustment voltage is controlled by maintaining the voltage.
The method of claim 1,
When calculating the predicted voltage or the adjusted voltage, the predicted voltage calculator or the adjusted voltage calculator uses the electric vehicle charge amount and the electric vehicle surplus storage amount.
The method of claim 1,
The predicted future electric vehicle surplus storage amount and the predicted future electric vehicle charge amount of the charging station or electric vehicle charger are at least one of very low, low, maintained, high, or very high compared to each reference value.
When one of the future electric vehicle surplus storage amount and the future electric vehicle charge amount is low or high, and the other is voltage maintenance, the predicted voltage is calculated as a voltage drop or a voltage increase or is calculated as a voltage maintenance according to the low or high value calculated voltage control unit.
The method of claim 1,
The predicted future electric vehicle surplus storage amount and the predicted future electric vehicle charge amount of the charging station or electric vehicle charger are at least one of very low, low, maintained, high, or very high compared to each reference value.
When the future electric vehicle surplus storage amount and the future electric vehicle charge amount have the same direction, the predicted voltage is calculated as one of a voltage drop, a voltage maintenance, or a voltage rise by a relative comparison between the future electric vehicle surplus storage amount and the future electric vehicle charge amount .
delete 9. The method of at least any one of claims 3, 5, 7, or 8, wherein
In maintaining the voltage of the predicted voltage, when the predicted voltage of the charging station or the electric vehicle charger falls or rises, but there is no need for voltage adjustment because the degree of the fall or rise is small, or the lowered or raised predicted voltage is the maintenance voltage drop ( A voltage control device that is included in the case of being included within the optimal operating period for CVR).

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