KR102265569B1 - Electric Charging Infrastructure and Renewable Energy Acceptance Expansion System and Method - Google Patents

Abstract

The present invention discloses an electric charging infrastructure and a method of expanding the acceptability of new and renewable energy for expanding the acceptability of new and renewable energy flowing into the electric charging infrastructure and system. The present invention provides power by controlling the ESS linked to the end of the power system to supply power, thereby maintaining the existing facilities as it is, and stably supplying power to heavy-duty electric chargers such as a large number of automobiles even if the transformer capacity and line capacity are exceeded. It relates to an electric charging infrastructure and a system and method for expanding the acceptability of new and renewable energy by allowing the inflow of energy to expand the acceptability.

Description

Electric Charging Infrastructure and Renewable Energy Acceptance Expansion System and Method}

The present invention relates to a system and method for expanding the acceptance of electric charging infrastructure and renewable energy, and more particularly, by linking the ESS to the end of the power system, supplying power, and charging the ESS, even when a load is applied above the maximum acceptable current of the power system line It relates to an electric charging infrastructure and a system and method for expanding the acceptability of new and renewable energy that enable stable power supply in the power system and allow the inflow of new and renewable energy.

To reduce greenhouse gas, the government is implementing policies to expand the supply of new and renewable energy and electric vehicles, and accordingly, the supply rate of slow electric chargers is rapidly increasing among consumers. However, there is a limit to the operation of an electric charger with a capacity of 7kW or more in a low-voltage system designed for the capacity of the transformer.

Currently, the number of chargers for electric vehicles that can be connected to low-voltage lines below the pole transformer is determined according to the transformer capacity, and when the load + charger (7kW/unit) exceeds the transformer capacity, the charger connection is restricted.

In order to sufficiently accommodate the high-capacity electric charger, the transformer is replaced to accommodate all electric chargers that can be connected to the corresponding line, and at the same time, the low-voltage line can also be replaced by calculating the thickness according to the capacity.

However, in order to have such a system, the transformer and the line must be continuously reinforced, and the protection system also has a problem in that it must be adjusted accordingly.

Therefore, in the current low voltage distribution system that does not have a voltage control function, the inflow ratio of high-capacity electric chargers that can cause low voltage is calculated and the connection of electric chargers connected to the low voltage distribution line is restricted.

In addition, as the number of consumers who install renewable energy generators increases, the inflow of renewable energy is also increasing, but it is necessary to expand the acceptability of the inflow of renewable energy, which is increasing due to the limitation of line capacity.

Korean Patent Registration No. 10-0397778, which is a prior invention, suggests a bypass device for continuously supplying power to a low voltage line from a pole transformer installed in a distribution line, whereas the prior invention performs uninterruptible control, whereas the present invention provides bidirectional power The purpose and configuration are different in terms of performing control.

Korean Patent No. 10-0397778

The present invention for solving the above problem controls the charging and discharging of the ESS linked to the end of the power system, so that even if a load exceeding the maximum capacity according to the capacity of the transformer included in the power system is applied, stable power supply is possible and It is an object of the present invention to provide an electric charging infrastructure and a system and method for expanding the acceptance of renewable energy that exceed the limit of the line capacity of renewable energy.

Electric charging infrastructure and renewable energy acceptance expansion system according to an embodiment of the present invention for solving the above technical problem is a load power receiver for receiving the load power applied to the power system including a transformer and a line; a transformer capacity receiving unit for receiving the supplyable capacity of the transformer; and a control unit for controlling supply of power to the power system and charging from the power system of an Energy Saving System (ESS) connected to the end of the line of the power system, wherein the control unit is the load received from the load power receiver It is characterized in that the power supply and charging of the ESS are controlled based on the power and the supplyable capacity of the transformer provided from the transformer capacity receiver.

Preferably, further comprising a line voltage receiving unit for receiving the line voltage of the power system, wherein the control unit is the load power received from the load power receiving unit, the supply available capacity of the transformer provided from the transformer capacity receiving unit and the It is to control the power supply and charging of the ESS based on the line voltage received from the line voltage receiver.

Preferably, the load power receiver receives load power for each section of the line divided according to a predetermined criterion.

Preferably, the load power receiver receives load power for each section of the line partitioned according to a predetermined standard, and the line voltage receiver receives the line voltage for each section of the line partitioned according to the predetermined standard. will do

Preferably, the control unit controls the power supply of the ESS and charging from the power system based on the load power provided from the load power receiving unit and the supplyable capacity of the transformer provided from the transformer capacity receiving unit.

In addition, the method for expanding electric charging infrastructure and renewable energy acceptability according to another embodiment of the present invention includes the steps of: receiving load power applied to a power system including a transformer and a line; receiving a supplyable capacity of the transformer; and controlling the power supply to the power system and charging from the power system of an Energy Saving System (ESS) linked to the end of the line of the power system, wherein the power supply control step is received in the load power receiving step It is characterized in that the power supply and charging of the ESS are controlled based on the load power and the supplyable capacity of the transformer received in the supplyable capacity receiving step.

Preferably, further comprising the step of receiving the line voltage of the power system,

The power supply control and charging control step is the power supply of the ESS based on the load power received in the load power receiving step, the transformer capacity received in the transformer capacity receiving step, and the line voltage received in the line voltage receiving step and to control charging.

Preferably, the step of receiving the load power is to receive the load power for each section of the line divided according to a predetermined criterion.

Preferably, the step of receiving the load power receives load power for each section of the line partitioned according to a predetermined criterion, and the step of receiving the line voltage is a line voltage for each section of the line partitioned according to the predetermined criterion. is to receive

The present invention provides power to the power system by controlling the ESS linked to the end of the power system when a load greater than or equal to the maximum acceptable power is applied to the power system, or by receiving and charging power from the power system, while maintaining the existing facilities as they are It is possible to supply stable power to heavy-duty electric chargers, etc., and has the effect of increasing the grid-connected capacity of incoming new and renewable energy.

1 shows a configuration diagram of an ESS-linked low-voltage line according to an embodiment of the present invention.
2 shows a conceptual diagram of an ESS-linked low-voltage line according to an embodiment of the present invention.
Figure 3 shows a block diagram of the electric charging infrastructure acceptance expansion system 90 according to an embodiment of the present invention.
4 shows a voltage profile graph for a charge/discharge operation method of an ESS according to an embodiment of the present invention.
5 shows a flowchart of a method for expanding electric charging infrastructure and renewable energy acceptance according to another embodiment of the present invention.
6 is a detailed flowchart of a method for expanding acceptance of electric charging infrastructure according to another embodiment of the present invention.
7 is a flowchart illustrating a charging/discharging mode operation of a more detailed method for expanding acceptance of electric charging infrastructure according to another embodiment of the present invention.
8 shows a structural diagram of the low-pressure system configuration modeled for the simulation of the present invention.
9 shows a usage load pattern assuming 24 hours in order to perform the simulation analysis according to FIG. 8 .
FIG. 10 shows a graph of section power before ESS connection in the simulation analysis according to FIGS. 8 and 9 .
FIG. 11 shows a voltage characteristic graph before ESS connection in the simulation analysis according to FIGS. 8 and 9 .
12 shows a graph of section power after ESS connection in the simulation analysis according to FIGS. 8 and 9 .
13 shows a graph of voltage characteristics after ESS connection in the simulation analysis according to FIGS. 8 and 9 .
14 shows the load current characteristics of the power system 10 when the ESS 30 is discharged according to an embodiment of the present invention.
15 shows the load current characteristics of the power system 10 when the ESS 30 is charged according to an embodiment of the present invention.

The purpose and technical configuration of the present invention, and details regarding the operational effects thereof will be more clearly understood by the following detailed description based on the accompanying drawings in the specification of the present invention. Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 shows a configuration diagram of an ESS-linked low-voltage line according to an embodiment of the present invention. The fact that data communication such as load power measured at a predetermined point of the line 40 is performed is shown by a dotted line connecting the circle and other ESS 30 components. The electric charging infrastructure and renewable energy acceptance expansion system 90 may be provided included in the ESS 30 according to an embodiment, and thus may be omitted from the drawings.

Referring to FIG. 1 , the power system 10 includes a transformer 20 for supplying power to the power system 10 , and the ESS 30 is installed in connection with the end of the line 40 of the power system 10 . has been Transformer 20 includes a delta-wye transformer with a capacity of 22.9/0.38 kV. Electric charging infrastructure and renewable energy acceptance expansion system 90 according to the present invention receives the load power or line voltage applied to the line 40 included in the power system 10, and the line 40 of the power system 10 ) to control the power supply to the power system 10 of the ESS 30 linked to the terminal.

The installed capacity of the ESS 30 connected to the end of the line 40 of the power system 10 is appropriate to be about 1.3 times the capacity of the transformer.

The line 40 has a line impedance value [ohm/km] according to the material and thickness of the line, and the line impedance is determined according to the sum of the resistance R and the reactance jX. At this time, i refers to the number of each division point of the line 40 divided by section from the transformer 20 to the end of the line 40 .

The track 40 may mean the entire track from the edge to the end, and may mean an individual track divided for each section according to a predetermined standard. The line impedance of the line 40 is selected such that the material and thickness of the line have a value of 0.248 ohm/km from, for example, the end load to the end load, and the connecting line between the end load and the ESS 30 receives more power. The material and thickness of the line can be selected to have a value of 0.129 ohm/km.

Customer represents the consumer 80 including the electric vehicle (EV) battery charger 50 to the renewable energy generator 60 such as a photovoltaic (PV) generator and other loads 70 . Each section i of the track 40 may be partitioned according to a predetermined standard, for example, it may be partitioned for each customer 80 . Customer #i represents the customer 80 included in each section i of the track 40 . In addition, it is also possible to partition the line directly under the side bar or the end load and the line connecting the ESS 30 separately from the customer.

2 shows a conceptual diagram of an ESS-linked low-voltage line according to an embodiment of the present invention. At each point of the line divided by the consumers, the load power of the line according to the operation of the electric vehicle charger and the renewable energy generator is measured, and data transmission and reception can be made through TCP/IP communication.

Figure 3 shows a block diagram of the electric charging infrastructure acceptance expansion system 90 according to an embodiment of the present invention.

The electric charging infrastructure acceptance expansion system 90 includes a load power receiver 100 , a transformer capacity receiver 200 , a line voltage receiver 300 , and a controller 400 .

The electric charging infrastructure acceptance expansion system 90 includes the load power receiver 100, the transformer capacity receiver 200, and the controller 400 of the ESS 30 connected to the end of the line 40 of the power system 10. Controls the power supply to the power system (10). The ESS 30 supplies power to the power system 10 according to the control of the electric charging infrastructure acceptance expansion system 90 , thereby stabilizing the power of the power system 10 . In addition, the electric charging infrastructure acceptance expansion system 90 may control charging from the electric power system 10 of the ESS 30 connected to the end of the line 40 of the electric power system 10, and accordingly, the line capacity is expanded Even if not, it is possible to accommodate the inflow of renewable energy that exceeds the line capacity.

The load power receiver 100 receives the load power hung on the line 40 of the power system 10 including the transformer 20 . The load power can be measured at a predetermined point on the line, and when the current flows from the transformer 20 to the line 40 in the direction of the transformer 20 from the line 40 due to a positive value, the inflow of renewable energy, etc. It can be measured as a negative value.

The load power receiver 100 may receive load power applied to each section of the line 40 divided according to a predetermined criterion.

The predetermined criterion divides the section based on the point of the track 40 connected with the consumer 80 including the individual electric vehicle battery charger 50 , the renewable energy generator 60 and other loads 70 . may be doing

At this time, the order of dividing the division of the track 40 is preferably starting from i = 0 and ascending from the line directly under the side of the side to the ESS-linked line, but is not limited to this method, and the dividing point of the line 40 is also It is not limited to the method shown in the drawings.

The load power receiver 100 may receive the measured load power from a measurement device capable of wired/wireless communication such as TCP/IP at a point where the line 40 is divided according to a predetermined criterion using wired/wireless communication.

The transformer capacity receiving unit 200 receives the supplyable capacity of the transformer 20 . The supplyable capacity of the transformer 20 may be an upper and lower limit value obtained according to a predetermined ratio from the maximum capacity to the maximum capacity of the transformer 20 . For example, the supplyable capacity of the transformer 20 may be 80% of the maximum capacity as the upper limit, and 40% of the maximum capacity as the lower limit value.

As in the example, when 80% of the maximum capacity of the transformer 20 is the upper limit of the supplyable capacity of the transformer 20 and the lower limit is 40% of the maximum capacity of the transformer 20, the control unit 400 controls the supply of the transformer 20 By controlling the supply of power to the power system 10 of the ESS 30 or charging from the power system 10 before the load power exceeding the upper and lower limits of the available capacity is applied, the fluctuation range of the current and voltage of the power system 10 is reduced and stable can be operated as

Figure 4 shows a voltage profile graph for the charging / discharging operation method of the ESS according to an embodiment of the present invention.

Referring to FIG. 4 , ESS discharging means supplying power to the power system 10 of the ESS 30 , and ESS charging represents charging from the power system 10 of the ESS 30 .

In addition, Upper limit and Lower limit represent the upper and lower limits of the voltage set as the transformer capacity receiving unit 200 sets the upper and lower limits of the supplyable capacity of the transformer 20 , and accordingly the voltage of the power system 10 is more stably shows that it can be maintained.

The line voltage receiver 300 receives the line voltage of the power system 10 . The line voltage receiving unit 300 may receive a voltage measured at a predetermined point of the line 40 .

The line voltage receiver 300 may receive the line voltage measured for each section (i) of the line 40 divided according to a predetermined criterion.

The line voltage receiving unit 300 may receive the line voltage measured from a measurement device capable of wired/wireless communication such as TCP/IP at a point where the line 40 is partitioned according to a predetermined criterion using wired/wireless communication.

Line voltage receiving unit 300 is from the line 40 of the power system 10 in order to stabilize the voltage when the voltage of the power system 10 is not stable when the maximum acceptable current allowed by the line 40 flows. Upon receiving the measured line voltage, the control unit 400 may stabilize the voltage of the line 40 based on the line voltage received from the line voltage receiving unit 300 .

The control unit 400 controls the power supply to the power system 10 of the ESS 30 linked to the end of the line of the power system.

The control unit 400 may control the power supply of the ESS 30 based on the load power provided from the load power receiving unit 100 and the supplyable capacity of the transformer 20 provided from the transformer capacity receiving unit 200 .

The control unit 400 according to the difference between the sum of the load power for each section (i) of the line 40 collected according to Equation 1 below and the supply capacity of the transformer 20 linked to the corresponding power system 10 The output capacity of the ESS 30 for the power system 10 can be calculated and controlled. In this case, P _ref is the ESS output capacity command value, P _n is the load power value of each point, and Tr _p is the supply capacity of the transformer.

The control unit 400 is the power of the ESS 30 based on the load power received from the load power receiving unit 100 , the supplyable capacity received from the transformer capacity receiving unit 200 , and the line voltage received from the line voltage receiving unit 300 . You can also control the supply. In addition, charging from the power system 10 of the ESS 30 may be controlled.

6%로 정의될 수 있다.The control unit 400 divides the load power for each section (i) of the line 40 divided according to a predetermined standard provided from the load power receiver 100 or a predetermined standard provided from the line voltage receiver 300 . Based on the line voltage for each section (i) of the line 40, the line current per section (i) of the line 40 is made to be less than or equal to the maximum accommodated current, or line voltage per section (i) of the line 40 It is desirable to keep it within this tolerance. The error range of line voltage is 220V, for example.

It can be defined as 6%.

The control unit 400 controls the charging/discharging mode of the ESS 30 linked to the end of the line 40 of the power system 10 to supply (discharge) power to the power system 10 and from the power system 10 Charging of the ESS 30 can be controlled.

_{At this time, for example, the control unit 400 may control the load power measurement values P 1} , P ₂ , for each section of the line 40 partitioned according to a predetermined criterion received by the load power receiver 100 as shown in Equation 2 below. ..., P _n is the sum of the positive and to generate a signal α to control the ESS (30) to the discharge mode, a negative value may be one that generates a signal β which controls a charging mode.

In addition, after determining the charging/discharging mode of the ESS 30 , the controller 400 may determine the operating time and operating capacity of the ESS 30 according to Equation 3 below.

를 생성할 수 있다. The operating time of the ESS 30 in the discharge mode may be determined based on the maximum capacity of the transformer. _{For example, the control unit 400 is a signal for operation so that the ESS 30 is discharged when the sum P n} of the load power received from the load power receiver 100 is greater than or equal to Tr, which is 80% of the maximum capacity of the transformer 20 .

can create

Even in the charging mode, the operating time of the ESS 30 may be determined based on the maximum capacity of the transformer. _{For example, the control unit 400 is a signal δ for operation so that the ESS 30 is charged when the sum P n} of the load power received from the load power receiver 100 is less than or equal to Tr, which is 40% of the maximum capacity of the transformer 20 . can create

The controller 400 may determine whether to continue the operation of the ESS 30 by determining the SOC of the ESS 30 . That is, when the SOC of the ESS 30 is, for example, less than 10% due to active power emission in the discharge mode, the ESS stops operating in consideration of safety. In addition, when the remaining capacity (SOC) exceeds, for example, 90% due to active power absorption in the charging mode, the ESS stops operating. Accordingly, the ESS 30 operation control signal generated by the controller 400 is summarized in a table as follows.

5 shows a flowchart of a method for expanding electric charging infrastructure and renewable energy acceptance according to another embodiment of the present invention.

First, the load power applied to the power system 10 including the transformer 20 and the line 40 is received (S100). Then, the supply available capacity of the transformer 20 is received (S200). Subsequently, the line voltage of the power system 10 may be received (S300). Then, power supply to the power system 10 of the ESS 30 connected to the end of the line of the power system 10 and charging from the power system 10 are controlled (S400).

In step S400, the power supply and charging of the ESS 30 can be controlled based on the load power received in step S100 and the transformer capacity received in step S200, and based on the line voltage received in step S300, the Power supply and charging can also be controlled.

In step S100, load power may be received for each section (i) of the line 40 partitioned according to a predetermined standard, and in step S300, the section (i) of the line 40 divided according to a predetermined standard as in step S100. ) can receive line voltage.

6 shows a detailed flowchart of a method for expanding electric charging infrastructure and renewable energy acceptance according to another embodiment of the present invention.

_{First, the load power P 1} , P ₂ , ..., Pn of the line 40 divided according to a predetermined criterion is received ( S101 ). Next, P is calculated by subtracting the capacity Tr that can be supplied from the transformer from the sum of the load power received in step S101 (S201). Next, it is determined whether P calculated according to step S201 is greater than 0 (S301). Then, if the result of step S301 is false, step S101 is performed again, and if true, the corresponding P is allocated as the output capacity of the ESS 30 (S401). Next, the line voltage of the line 40 divided according to a predetermined criterion is received and it is determined whether it is within an allowable error range (S501). If the line voltage is within the allowable error range, it is terminated, and if it is not within the allowable error range, the output capacity P of the ESS 30 is calculated again so that the line voltage is within the allowable error range (S601).

7 shows a more detailed electric charging infrastructure and a charging/discharging mode operation flowchart of a method for expanding the acceptance of new and renewable energy according to another embodiment of the present invention.

First, to receive the load power (P _L) of the ESS (30) associated around the power system a voltage value of line 40 from 0.94 (10) [PU] Line 40 is the current flowing into the load in the transformer when, When the voltage value of the line 40 is 1.06 [PU], the load power P _G is received from the line 40 through which the current flows from the load side to the transformer (S102). P _L, P _G values As a reference, when charging/discharging the ESS 30 , it can be operated so that the power of the entire section of the power system 10 does not exceed the standard. _{Then, the load power P 1} , P ₂ , ..., Pn of the line 40 divided according to a predetermined criterion is received ( S202 ). Next, _if the sum of P n is greater than 0, control is performed in the discharging mode, and when the sum of P n is less than 0, the control is performed in the charging mode (S302). Next, in the discharge mode, _{it is determined whether the sum of P n} is greater than 80% of the maximum capacity Tr of the transformer 20 (S402), and if it is large, the discharge capacity command value P _{ref_dis} of the ESS 30 is set to P _L - 0.8Tr calculated accordingly (S502), and if it is less than or equal to, the operation of the ESS 30 is stopped (S602). On the other hand, in the charging mode, _{it is determined whether the sum of P n} is less than 40% of the maximum capacity Tr of the transformer 20 (S402), and if it is smaller, the charging capacity command value P _{ref_chg} of the ESS 30 is set to PG - 0.4Tr is calculated according to (S502), and if it is abnormal, the operation of the ESS 30 is stopped (S602). Next, in the discharge mode, it is determined whether the remaining capacity (SOC) of the ESS 30 is greater than 10% (S702), and if it is large, the ESS 30 is controlled to supply power to the power system 10 (S802), and if less than The operation of the ESS 30 is stopped (S602). On the other hand, in the charging mode, it is determined whether the remaining capacity (SOC) of the ESS 30 is less than 90% (S702), and if it is smaller, the ESS 30 is controlled and charged from the power system 10 (S802), and more In this case, the operation of the ESS 30 is stopped (S602).

8 shows a structural diagram of a low-pressure system configuration modeled for simulation according to an embodiment of the present invention.

In the low voltage system configuration modeled according to FIG. 8 , the line 40 is divided into 4 sections based on the consumer 80 including the electric vehicle battery charger 50 and other loads 70 and the renewable energy generator 60 . and the capacity of the transformer 20 included in the power system 10, the line impedance of the line 40 (Line Impedance 1 from the side band to the terminal end, Line Impedance 2 from the terminal end to the ESS), the customer 80 The capacity of the included load 70 and the capacity characteristics of the ESS 30 are shown in Table 2 below. In FIG. 8 , vsc is an example of a power transmission conversion system used to link the ESS 30 power to the power system 10 .

케이블을 이용하고, 말단 부하와 ESS(5)의 연계 선로는 보다 많은 전력을 수용할 수 있는 0.129ohm/km의 선로 임피던스 값을 갖는 185mm

케이블을 사용한다), Load는 수용가(80)의 부하를 지칭한다. 전기자동차(EV) 배터리 충전기(50) 및 기타 부하 발생 장치(70)를 동시에 고려할 경우 모든 구간 전력의 합은 600kW로 가정하였고, 해당 구간의 최대 부하 전력은 구간당 200kW로 가정하였다. 여기에서 말단에 연계된 ESS(30)는 구간(i)를 구획하는 부하의 합이 이용률을 고려한 변압기(20) 용량을 초과하였을 경우 동작하도록 설정하였다.In the simulation according to the embodiment of the present invention, the Pole Transformer of Table 2 is the transformer 20, Line Impedance 1 is the line impedance of the line 40 from the bandage to the end load, and Line Impedance 2 is the connection between the end load and the ESS 30 Using the line impedance of the line 40 (that is, in the case of a low voltage distribution line, from the side end to the end load, 95 mm with a line impedance value of 0.248 ohm/km

Using a cable, the connecting line between the end load and the ESS (5) is 185 mm with a line impedance value of 0.129 ohm/km that can accommodate more power.

Use a cable), Load refers to the load of the consumer (80). When the electric vehicle (EV) battery charger 50 and other load generating devices 70 are simultaneously considered, the sum of power in all sections is assumed to be 600 kW, and the maximum load power in the section is assumed to be 200 kW per section. Here, the ESS 30 connected to the terminal is set to operate when the sum of the loads dividing the section (i) exceeds the capacity of the transformer 20 in consideration of the utilization rate.

FIG. 9 illustrates a usage load pattern assuming 24 hours (24 seconds unit in the simulation) to perform the simulation analysis according to FIG. 8 .

The minimum value of the used load pattern was 150 kW, and the maximum value was assumed to be 600 kW, which is twice the maximum allowable power of the transformer 20 according to Table 1.

10 and 11 respectively show graphs of the section power and voltage characteristics before the ESS 30 connection in the simulation analysis according to FIGS. 8 and 9 .

Referring to FIG. 10 , it can be confirmed that the maximum power in the section is generated by 570 kW or more due to the introduction of the electric charging infrastructure in the power system 10 in which the maximum accommodated power according to the capacity that the transformer 20 can supply is 300 kW. Referring to FIG. 11 , it can be seen that the voltage drops to 0.84PU.

12 and 13 respectively show graphs of section power and voltage characteristics after ESS connection in the simulation analysis according to FIGS. 8 and 9 .

12, this time, for the low voltage power system 10 to which the electric charging infrastructure is introduced, the electric charging infrastructure and the new renewable energy acceptance expansion system 90 according to the present invention controls the power supply of the ESS 30. In this case, even if the maximum power according to the load of the consumer 80 is output as 700kW, the line capacity limited to 300kW is not exceeded, and referring to FIG. 13 , it can be confirmed that the voltage of all sections is also maintained within the allowed error range.

14 shows the load current characteristics of the power system 10 when the ESS 30 is discharged according to an embodiment of the present invention. The solid line indicates the characteristic when there is no connection of the ESS 30 , and the dotted line indicates the characteristic when the connection of the ESS 30 is present. The voltage drop appears as going to the ESS 30 installation point at the end of the power system 10 . The voltage drop in the sections before the installation point of the ESS 30 is compensated according to the effective power supply of the ESS 30, and the voltage outside the lower limit is maintained within the specified range.

15 shows the load current characteristics of the power system 10 when the ESS 30 is charged according to an embodiment of the present invention. The solid line indicates the characteristic when there is no connection of the ESS 30 , and the dotted line indicates the characteristic when the connection of the ESS 30 is present. The voltage rise caused by the inflow of renewable energy is compensated for while the ESS 30 receives power from the power system 10 and is charged, and maintains the voltage out of the upper limit within the specified range.

The existing ESS (Energy Saving System) operation mainly focuses on economical operation under the assumption that all electricity is stable. However, the ESS operation strategy of the present invention focuses on power control.

That is, in the low voltage distribution system without the existing voltage control function, the inflow ratio of electric vehicle chargers that can cause low voltage must be calculated, and the connection of the electric charger connected to the low voltage distribution line must be restricted, or the power system (10) line Transformer replacements and low voltage lines are to be replaced to accommodate all electrical chargers that may be connected to (40).

However, according to the embodiment of the electric charging infrastructure and renewable energy acceptance expansion system 90 according to the present invention, by supplying power to the power system 10 from the ESS 30 connected to the end of the low voltage distribution line, the existing transformer ( 20) and line 40 facilities are maintained as they are, and power can be supplied to a load that exceeds the capacity of the transformer 20 and is twice the capacity of the transformer 20, so power can be supplied to a large number of electric chargers without expansion of transformers and line facilities. supply is possible.

6%)를 벗어날 수 있다. 그러나 본 발명과 같이 전력계통(10) 종단에 연계된 ESS(30)로부터 전력계통(10) 측에서 공급되어지는 전력을 분담하여 양방향으로 전력을 공급하여 선로(40)의 모든 구간 전력을 변압기 용량을 초과하지 않게 할 수 있고, 선로 전압을 허용치 이내로 유지할 수 있다.When all power is supplied from the same system side as the transformer 20 that supplies power to the power system 10 when operating a plurality of electric charging infrastructures linked to the consumer 70, the section power of the line 40 is the transformer ( 20) The capacity may be exceeded, and due to the voltage drop, the voltage may

6%) can be avoided. However, as in the present invention, power supplied from the power system 10 side from the ESS 30 connected to the end of the power system 10 is shared and power is supplied in both directions to convert the power in all sections of the line 40 to the transformer capacity. can not exceed, and the line voltage can be maintained within the allowable value.

In addition, the existing ESS linkage method cannot allow the inflow of new and renewable energy exceeding the line capacity, but according to the present invention, it allows the inflow of new and renewable energy that is twice the capacity of the existing line without increasing the line capacity. can expand the acceptability of

In addition, according to the present invention, when a system outage due to an accident occurs, the function of the ESS to supply power to the load through the independent microgrid function is also possible.

Those skilled in the art to which the present invention pertains should understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof, so the embodiments described above are illustrative in all respects and not restrictive. only do The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

10: power system
20: transformer
30: ESS
40: track
50: electric vehicle battery charger
60: renewable energy generator
70: other load
80: acceptor
90: Electric charging infrastructure and renewable energy acceptance expansion system
100: load power receiver
200: transformer capacity receiver
300: line voltage receiver
400: control unit

Claims (8)

a load power receiver for receiving load power applied to a power system including a transformer and a line;
a transformer capacity receiving unit for receiving the supplyable capacity of the transformer;
a line voltage receiver for receiving the line voltage of the power system; and
A control unit for controlling the supply of power to the power system and charging from the power system of an Energy Saving System (ESS) linked to the end of the line of the power system,
The power system is a low voltage distribution power system, and the control unit is based on the load power provided from the load power receiver and the supplyable capacity of the transformer provided from the transformer capacity receiver and the line voltage provided from the line voltage receiver. Electric charging infrastructure and renewable energy acceptance expansion system, characterized in that by controlling the power supply and charging of the ESS to the power system, it is possible to accommodate the load and the inflow of renewable energy in excess of the supplyable capacity of the transformer.
delete According to claim 1,
The electric charging infrastructure and renewable energy acceptance expansion system, characterized in that the load power receiver receives the load power for each section of the line divided according to a predetermined standard.
According to claim 1,
The load power receiver receives load power for each section of the line divided according to a predetermined criterion,
The electric charging infrastructure and renewable energy acceptance expansion system, characterized in that the line voltage receiving unit receives the line voltage for each section of the line divided according to the predetermined standard.
Receiving load power applied to a power system including a transformer and a line;
receiving a supplyable capacity of the transformer;
receiving a line voltage of the power system; and
Comprising the step of controlling the supply of power to the power system and charging from the power system of an Energy Saving System (ESS) linked to the end of the line of the power system,
The power system is a low voltage distribution power system, and the power supply control step includes the load power received in the load power receiving step and the supplyable capacity of the transformer received in the supplying capacity receiving step and the line voltage receiving step. Expanding electric charging infrastructure and renewable energy acceptance, characterized in that it can accommodate the inflow of load and renewable energy in excess of the supply capacity of the transformer by controlling the power supply and charging of the ESS based on the received line voltage Way.
delete ◈Claim 7 was abandoned when paying the registration fee.◈ 6. The method of claim 5,
The load power receiving step is an electric charging infrastructure and a method for expanding the acceptability of new and renewable energy, characterized in that receiving load power for each section of the line divided according to a predetermined criterion.
◈Claim 8 was abandoned when paying the registration fee.◈ 6. The method of claim 5,
The load power receiving step is to receive load power for each section of the line partitioned according to a predetermined criterion,
The line voltage receiving step is a method for expanding electric charging infrastructure and renewable energy acceptance, characterized in that receiving the line voltage for each section of the line divided according to the predetermined standard.

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