Charging pile system, capacity expansion method, flexible control method and flexible control system thereof

Abstract

The application discloses a charging pile system and a capacity expansion method, a flexible control method and a flexible control system thereof, and relates to the technical field of electric vehicle equipment charging, and comprises the following steps: obtaining information of an original charging pile system of a target area; wherein the information of the original charging pile system of the target area comprises a transformer and N original charging piles hung under the transformer, and input ends of the N original charging piles are respectively connected to an AC bus and the transformer; and modularly expanding the original charging pile system of the target area according to the information of the original charging pile system of the target area. The application can modularly and flexibly expand the original charging pile system of the target area according to the information of the original charging pile system of the target area while ensuring that the application of the original charging pile of the target area remains unchanged, can greatly improve the capacity of the charging pile system with minimum changes and minimum engineering quantity, and is beneficial to meeting the high-power and large-capacity charging demand of regional new energy vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging equipment, and in particular to a charging pile system and a capacity expansion method, a flexible control method, and a flexible control system thereof. Background Art

[0002] At present, the number of new energy vehicles continues to grow, and the demand for fast charging of new energy vehicles is becoming increasingly strong. The increase in charging power has resulted in the charging power and capacity of charging piles in existing areas being unable to meet charging demand. At the same time, the region is limited by the capacity of the upper-level transformer and cannot expand the charging power of the charging piles to meet the high-power and large-capacity charging needs.

[0003] The current mainstream method is to expand the capacity of the transformer or the charging pile. Expanding the transformer is time-consuming, labor-intensive and costly. However, different manufacturers have different methods for expanding the charging pile. There is no unified and effective expansion and control method, and users have difficulty expanding the charging pile. Summary of the Invention

[0004] In order to solve the technical problems existing in the background technology, the present invention proposes a charging pile system and a capacity expansion method, a flexible control method and a flexible control system.

[0005] In a first aspect, the present invention provides a method for expanding a charging pile system, comprising:

[0006] Obtaining information about an existing charging pile system in a target area; wherein the information about the existing charging pile system in the target area includes a transformer and N existing charging piles connected to the transformer, wherein input ends of the N existing charging piles are connected to an AC bus and a transformer, respectively;

[0007] According to the information of the original charging pile system in the target area, the original charging pile system in the target area is modularly expanded.

[0008] Furthermore, based on the information of the original charging pile system in the target area, the original charging pile system in the target area is modularly expanded, specifically including:

[0009] Determine whether all N existing charging piles are AC charging piles;

[0010] If yes, configure N new charging piles; wherein, the N new charging piles only support AC input;

[0011] Connect the input of each newly added charging pile to the AC bus; configure a corresponding energy storage unit under each original charging pile; connect the input of each energy storage unit to the output of the corresponding original charging pile, and connect the output of each energy storage unit to the AC bus.

[0012] Further, when judging whether the N original charging piles are all AC charging piles, further comprising:

[0013] If not, judging whether the N original charging piles are all DC charging piles;

[0014] If yes, one energy storage unit is correspondingly configured under each original charging pile, and N new charging piles are configured;

[0015] If the N new charging piles all support DC input and AC input at the same time, a first DC bus is configured; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the first DC bus; and the input end of each new charging pile is respectively connected to the first DC bus and an AC bus.

[0016] Further, if the N new charging piles all only support DC input, a second DC bus and a third DC bus are configured; the output end of each original charging pile is connected to the second DC bus; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the third DC bus; and the input end of each new charging pile is respectively connected to the second DC bus and the third DC bus.

[0017] Preferably, when judging whether the N original charging piles are all DC charging piles, further comprising:

[0018] If not, it means that there are X original DC charging piles and Y original AC charging piles in the N original charging piles, and N=X+Y;

[0019] X new charging piles are configured, and each of the X new charging piles supports AC input and DC input at the same time;

[0020] Y new charging piles are configured, and each of the Y new charging piles supports AC input and DC input at the same time;

[0021] A fourth DC bus is configured, and one energy storage unit is correspondingly configured under each original charging pile;

[0022] The input end of each energy storage unit is connected to the output end of the corresponding original charging pile, and the output end of each energy storage unit is connected to the fourth DC bus;

[0023] The input end of the X new charging piles and the Y new charging piles is respectively connected to an AC bus and the fourth DC bus.

[0024] In a second aspect, the present application further provides a charging pile system, comprising: N energy storage units, N new charging piles, a transformer, and N original charging piles hung under the transformer.

[0025] The input ends of the N original charging piles are respectively connected to an AC bus and a transformer; the N energy storage units are arranged in one-to-one correspondence with the N original charging piles;

[0026] When the N original charging piles are all AC charging piles, and the N new charging piles all support only AC input, the input end of each new charging pile is connected to the AC bus; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile, and the output end of each energy storage unit is connected to the AC bus.

[0027] Preferably, when the N original charging piles are all DC charging piles, and the N new charging piles all support DC input and AC input at the same time, the system further comprises a first DC bus;

[0028] The input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the first DC bus; and the input end of each new charging pile is respectively connected to the first DC bus and the AC bus.

[0029] Preferably, when the N original charging piles are all DC charging piles, and the N new charging piles all support only DC input, the system further comprises a second DC bus and a third DC bus;

[0030] The output end of each original charging pile is connected to the second DC bus; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the third DC bus; and the input end of each new charging pile is respectively connected to the second DC bus and the third DC bus.

[0031] Preferably, when there are X original DC charging piles and Y original AC charging piles among the N original charging piles, the N new charging piles comprise X new charging piles and Y new charging piles; wherein the X new charging piles and the Y new charging piles all support AC input and DC input at the same time; and wherein N = X + Y.

[0032] The system further comprises a fourth DC bus;

[0033] The input end of each energy storage unit is connected to the output end of the corresponding original charging pile, and the output end of each energy storage unit is connected to the fourth DC bus; and the input end of the X new charging piles and the Y new charging piles is respectively connected to the AC bus and the fourth DC bus.

[0034] In a third aspect, the present application further provides a flexible control method of a charging pile system, applied to the charging pile system of any one of the second aspect, comprising:

[0035] obtaining real-time parameters of the charging pile system; wherein, the real-time parameters include real-time power P 变 of the transformer 充i and real-time energy storage information of each energy storage unit; wherein, the real-time energy storage information includes chargeable power P 放i , dischargeable power P i and SOC 变 of each energy storage unit; wherein, i = 1, 2, …, N

[0036] judging whether the transformer has an overload risk according to the real-time power P 变th of the transformer and a preset transformer overload risk threshold P 差 ,

[0037] if yes, controlling the corresponding energy storage unit to discharge according to the real-time parameters of the charging pile system;

[0038] if no, controlling the corresponding energy storage unit to charge according to the real-time parameters of the charging pile system.

[0039] further, controlling the corresponding energy storage unit to discharge according to the real-time parameters of the charging pile system, specifically including:

[0040] obtaining a difference P 差 between the real-time power of the transformer and the transformer overload risk threshold according to the real-time power of the transformer and the transformer overload risk threshold; wherein, P 变 = P 变th -P 充KSUM ;

[0041] judging whether each energy storage unit is in a non-charging state according to the real-time energy storage information of each energy storage unit;

[0042] if no, that is, there are K energy storage units in a charging state at this time; wherein, 0 < K < N

[0043] then calculating a total charging power P 充KSUM of the K energy storage units according to the real-time energy storage information of the K energy storage units;

[0044] if P 差 , controlling the K energy storage units to stop charging; wherein,

[0045]

[0046] if P 充KSUM < P 差 , controlling the K energy storage units to stop charging and simultaneously performing power compensation; wherein, the compensated power is P 补偿 , P 补偿 = P 差 -P 充KSUM.

[0047] Further, when there are K energy storage units in the charging state, there are also N-K energy storage units that can be discharged;

[0048] According to the real-time energy storage information of the N-K energy storage units that can be discharged, the sum P of the dischargeable power of the N-K energy storage units is calculated 可放SUM ;

[0049] If P 可放SUM ≥ P 补偿 , according to the real-time energy storage information of the N-K energy storage units that can be discharged, P 补偿 is evenly distributed to the N-K energy storage units to obtain the discharge target power of each energy storage unit in the N-K energy storage units;

[0050] According to the discharge target power of each energy storage unit in the N-K energy storage units, the corresponding energy storage unit is controlled to discharge;

[0051] If P 可放SUM < P 补偿 , control the N-K energy storage units to discharge until the dischargeable power of each energy storage unit in the N-K energy storage units is 0.

[0052] Further, when judging whether the energy storage units are all in the non-charging state, it also includes:

[0053] If yes, that is, at this time N energy storage units are all in the non-charging state, according to the real-time energy storage information of each energy storage unit, P 差 is evenly distributed to each energy storage unit to obtain the discharge target power of each energy storage unit;

[0054] According to the discharge target power of each energy storage unit, each energy storage unit is controlled to discharge.

[0055] Further, according to the real-time parameters of the charging pile system, the corresponding energy storage unit is controlled to charge, specifically including:

[0056] According to the real-time energy storage information of each energy storage unit, it is judged whether each energy storage unit is all in the non-charging state;

[0057] If no, that is, at this time there are K energy storage units in the charging state, and there are N-K energy storage units in the chargeable state; Wherein, 0

[0058] According to the real-time energy storage information of the N-K energy storage units that can be charged, the total chargeable power P of the N-K energy storage units is calculated 可充SUM ; Wherein, P 可充SUM =P变th -P 变 ;

[0059] The total rechargeable power P of the NK energy storage units 可充SUM Evenly distribute the power to each of the NK energy storage units to obtain a charging target power for each of the NK energy storage units;

[0060] According to the charging target power of each energy storage unit in the NK energy storage units, the charging of the corresponding energy storage unit is controlled.

[0061] Furthermore, when determining whether all energy storage units are in a non-charging state, the method further includes:

[0062] If yes, that is, when all N energy storage units are in a non-charging state, then according to the real-time power of the transformer and the transformer overload risk threshold, the difference P between the real-time power of the transformer and the transformer overload risk threshold is obtained. 差 Among them, P 差 =P 变 -P 变th ;

[0063] According to the real-time energy storage information of each energy storage unit, P 差 Evenly distribute it to each energy storage unit to obtain the discharge target power of each energy storage unit;

[0064] The discharge of each energy storage unit is controlled according to the discharge target power of each energy storage unit.

[0065] In a fourth aspect, the present invention further proposes a flexible control system for a charging pile system, which is applied to the charging pile system described in any one of the second aspects; the flexible control system includes: a flexible management unit and an acquisition unit;

[0066] The acquisition unit is used to obtain real-time parameters of the charging pile system; wherein the real-time parameters include the real-time power of the transformer and the real-time energy storage information of each energy storage unit;

[0067] The flexible management unit is used to determine whether the transformer is at risk of overload based on the real-time power of the transformer and the preset transformer overload risk threshold; if so, the corresponding energy storage unit is controlled to discharge according to the real-time parameters of the charging pile system; if not, the corresponding energy storage unit is controlled to charge according to the real-time parameters of the charging pile system.

[0068] The charging pile system, the capacity expansion method, the flexible control method and the flexible control system provided by the present application can be used to solve the problem of difficult expansion of the charging pile system, and can be used to perform modular and flexible expansion of the original charging pile system in the target area based on the information of the original charging pile system in the target area, so that the capacity of the charging pile system can be greatly improved with minimum modification and minimum engineering quantity, and the high-power and high-capacity charging demand of the new energy vehicles in the region can be met. BRIEF DESCRIPTION OF DRAWINGS

[0069] Figure 1 The structure diagram of the charging pile system in an embodiment of the present application is shown.

[0070] Figure 2 The structure diagram of the charging pile system in another embodiment of the present application is shown.

[0071] Figure 3 The structure diagram of the charging pile system in another embodiment of the present application is shown.

[0072] Figure 4 The structure diagram of the charging pile system in another embodiment of the present application is shown. DETAILED DESCRIPTION

[0073] It should be noted that the embodiments and the features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0074] In a first aspect, the present application provides a capacity expansion method of a charging pile system, which comprises the following steps:

[0075] obtaining the information of the original charging pile system in the target area;

[0076] expanding the original charging pile system in the target area in a modular manner based on the information of the original charging pile system in the target area.

[0077] The present application can be used to solve the problem of difficult expansion of the charging pile system, and can be used to perform modular and flexible expansion of the original charging pile system in the target area based on the information of the original charging pile system in the target area, so that the capacity of the charging pile system can be greatly improved with minimum modification and minimum engineering quantity, and the high-power and high-capacity charging demand of the new energy vehicles in the region can be met.

[0078] In the embodiment, the information of the original charging pile system of the target area includes a transformer and N original charging piles OAC hung under the transformer, and the input ends of the N original charging piles are respectively connected to an AC bus and the transformer.

[0079] wherein the maximum capacity of the transformer is P 变max , and the rated power of each original charging pile OAC is P OAC , and In the formula, represents a preset dead zone value.

[0080] wherein the original charging pile system of the target area needs to support N vehicles to charge at the same time, and the maximum rated power of each vehicle is P 车 , and P 车 >P OAC .

[0081] wherein the charging pile expansion limitation condition is that the maximum power of the load hung under the transformer is P lsun , P lsun P 变max , P lsun =N×P 车 .

[0082] It should be understood that the types of the original charging piles in the original charging pile system of the target area in the embodiment include one or more of AC charging piles and DC charging piles.

[0083] In the embodiment, the original charging pile system of the target area is modularly expanded according to the information of the original charging pile system of the target area, specifically including:

[0084] determining whether the N original charging piles are all AC charging piles;

[0085] if yes, configuring N new charging piles AC; wherein the N new charging piles AC all only support AC input, that is, the N new charging piles AC are all AC charging piles;

[0086] connecting the input end of each new charging pile to the AC bus;

[0087] configuring one energy storage unit under each original charging pile; connecting the input end of each energy storage unit to the output end of the corresponding original charging pile, and connecting the output end of each energy storage unit to the AC bus.

[0088] In this way, the N energy storage units in the embodiment are charged by the original charging piles and can discharge to the AC bus, and the new charging piles are used to charge the vehicles by taking power from the AC bus. The embodiment greatly improves the capacity of the charging pile system with minimal changes, which is conducive to meeting the high-power and large-capacity charging needs of regional new energy vehicles.

[0089] It should be understood that the new charging piles in the embodiment only support AC input, but also support AC output and DC output.

[0090] It should be understood that the rated power of each new charging pile AC in the embodiment is P AC , the rated power of each energy storage unit ESS is P ESS , P ESS =P OAC , P AC =P lsun / N.

[0091] Wherein, the sum of the capacities of all N energy storage units is denoted as the total capacity of the energy storage units Q ESS , Q ESS >Q lsun , Q lsun represents the maximum capacity required when N vehicles are charging at the same time, wherein In the formula, P 实时ACi represents the real-time power of the i-th vehicle, and t 车充电持续 represents the charging timing time of the i-th vehicle.

[0092] In one more specific embodiment, the N new charging piles are arranged one-to-one with the N original charging piles, which facilitates the setting and use of the new charging piles and also simplifies the expansion process of the charging station.

[0093] In a further embodiment, when determining whether the N original charging piles are all AC charging piles, it further includes:

[0094] If not, it is determined whether the N original charging piles are all DC charging piles;

[0095] If yes, one energy storage unit is correspondingly configured under each original charging pile, and N new charging piles are configured;

[0096] If the N new charging piles are all AC-DC integrated charging piles, i.e., the N new charging piles simultaneously support DC input and AC input, a first DC bus is configured; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the first DC bus; and the input end of each new charging pile is connected to the first DC bus and the AC bus, respectively.

[0097] In this way, the N energy storage units in the embodiment are charged by the original charging pile in direct current, and can be discharged to the first direct current bus, and the new charging pile can be used to charge the automobile by taking power from the alternating current bus and the first direct current bus. The embodiment greatly improves the capacity of the charging pile system with minimal changes, which is conducive to meeting the high-power and large-capacity charging needs of regional new energy vehicles.

[0098] In this embodiment, the N new charging piles are AC / DC integrated charging piles, which support direct current input and alternating current input, and also support direct current output and alternating current output.

[0099] The rated power of each new charging pile in the embodiment is P AC , and the rated power of each energy storage unit ESS is P ESS , P ESS =P OAC , and P AC =P lsun / N-P ESS .

[0100] In a further embodiment, if the N new charging piles are all direct current charging piles, i.e., the N new charging piles only support direct current input, a second direct current bus and a third direct current bus are configured; the output end of each original charging pile is connected to the second direct current bus; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the third direct current bus; and the input end of each new charging pile is connected to the second direct current bus and the third direct current bus, respectively.

[0101] In this way, the original charging pile can be discharged to the second direct current bus; the N energy storage units can take power from the second direct current bus for charging and can be discharged to the third direct current bus; and the new charging pile can take power from the second direct current bus and the third direct current bus to charge the automobile. The embodiment greatly improves the capacity of the charging pile system with minimal changes, which is conducive to meeting the high-power and large-capacity charging needs of regional new energy vehicles.

[0102] In this embodiment, the N new charging piles are all direct current charging piles, i.e., the N new charging piles only support direct current input, but also support alternating current output and direct current output.

[0103] The rated power of each new charging pile in the embodiment is P AC , and the rated power of each energy storage unit ESS is P ESS , P ESS =P OAC , and P AC =P lsun / N.

[0104] In a further embodiment, when judging whether the N original charging piles are all direct current charging piles, further comprising:

[0105] If not, that is, there are X original direct current charging piles and Y original alternating current charging piles in the N original charging piles, and N = X + Y; X new charging piles are configured, and each of the X new charging piles simultaneously supports alternating current input and direct current input;

[0106] Y new charging piles are configured, and each of the Y new charging piles simultaneously supports alternating current input and direct current input;

[0107] A fourth direct current bus is configured, and a corresponding energy storage unit is configured under each original charging pile;

[0108] The input end of each energy storage unit is connected to the output end of the corresponding original charging pile, and the output end of each energy storage unit is connected to the fourth direct current bus;

[0109] The input ends of the X new charging piles and the Y new charging piles are respectively connected to the alternating current bus and the fourth direct current bus.

[0110] The embodiment is thus configured, each energy storage unit is charged through the corresponding original charging pile, and can be discharged to the fourth direct current bus, and each new charging pile can simultaneously take power from the alternating current bus and the direct current bus to charge the automobile.

[0111] Similarly, in order to facilitate the setting and use of new charging piles, and to simplify the expansion process of the charging station, the X new charging piles are arranged in one-to-one correspondence with the X original direct current charging piles, and the Y new charging piles are arranged in one-to-one correspondence with the Y original alternating current charging piles.

[0112] It should be noted that the N new charging piles in the embodiment simultaneously support alternating current output and direct current output. The rated power of each AC in the X new charging piles in the embodiment is P ACX , the rated power of each AC in the Y new charging piles is P ACY , and the rated power of each energy storage unit ESS is P ESS = P OAC , P ACX = P lsun / N-P ESS , P ACY = P lsun / N.

[0113] In summary, the embodiment can be applied to different original charging pile systems, and the original charging pile application in the target area is not changed, and the modular flexible expansion is carried out; and the capacity of the charging pile system can be greatly improved with minimum modification and minimum engineering quantity, which is beneficial to meet the high-power and large-capacity charging demand of regional new energy vehicles.

[0114] In a second aspect, as Figure 1 shown in the drawings, the application further provides a charging pile system obtained by using the charging pile modular expansion method in any one of the first aspect, comprising: N energy storage units, N new charging piles, a transformer and N original charging piles hung under the transformer;

[0115] The input end of each of the N original charging piles is connected to an AC bus and a transformer; the N energy storage units are arranged in one-to-one correspondence with the N original charging piles.

[0116] When the N original charging piles are all AC charging piles, and the N new charging piles all support AC input, the input end of each new charging pile is connected to the AC bus; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile, and the output end of each energy storage unit is connected to the AC bus.

[0117] It should be noted that, Figure 1 the original AC charging pile in the above means the original charging pile in the embodiment.

[0118] As Figure 2 shown in the drawings, in a further embodiment, when the N original charging piles are all DC charging piles, and the N new charging piles all support DC input and AC input at the same time, a first DC bus is further included.

[0119] The input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the first DC bus; and the input end of each new charging pile is connected to the first DC bus and the AC bus respectively.

[0120] It should be noted that, Figure 2 the original DC charging pile in the above means the original charging pile in the embodiment.

[0121] As Figure 3 shown in the drawings, in a further embodiment, when the N original charging piles are all DC charging piles, and the N new charging piles all support DC input, a second DC bus and a third DC bus are further included.

[0122] The output end of each original charging pile is connected to the second DC bus; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the third DC bus; and the input end of each new charging pile is respectively connected to the second DC bus and the third DC bus.

[0123] It should be noted that, Figure 3 The original DC charging pile in the above formula represents the original charging pile in the embodiment.

[0124] As shown in the formula, Figure 4 When there are X original DC charging piles and Y original AC charging piles in the N original charging piles, the N new charging piles include X new charging piles and Y new charging piles; each of the X new charging piles supports AC input and DC input at the same time, each of the Y new charging piles supports AC input and DC input at the same time; and N = X + Y.

[0125] Further comprising a fourth DC bus;

[0126] The input end of each energy storage unit is connected to the output end of the corresponding original charging pile, and the output end of each energy storage unit is connected to the fourth DC bus; the input end of the X new charging piles and the Y new charging piles is respectively connected to the AC bus and the fourth DC bus.

[0127] Compared with the original charging pile system of the target area, the charging pile system in the embodiment is modularly and flexibly expanded while ensuring the application of the original charging pile of the target area, which can greatly improve the capacity of the charging pile system with minimal changes and minimal engineering quantity, and is conducive to meeting the high-power and large-capacity charging needs of regional new energy vehicles.

[0128] In a third aspect, the present application further provides a flexible control method of a charging pile system, applied to the charging pile system of any one of the second aspect, comprising:

[0129] Obtaining real-time parameters of the charging pile system; wherein the real-time parameters include real-time power P 变 of the transformer and real-time energy storage information of each energy storage unit;

[0130] According to the real-time power P 变 of the transformer and the preset transformer overload risk threshold, it is judged whether the transformer has an overload risk,

[0131] If yes, according to the real-time parameters of the charging pile system, the corresponding energy storage unit is controlled to discharge;

[0132] If not, according to the real-time parameters of the charging pile system, the corresponding energy storage unit is controlled to charge.

[0133] The embodiment can obtain real-time parameters of the expanded charging pile system, and determine whether the transformer has an overload risk according to the real-time power P 变 and a preset transformer overload risk threshold, and if so, control the corresponding energy storage unit to discharge to reduce the power at the transformer end according to the real-time parameters of the charging pile system, and if not, control the corresponding energy storage unit to charge according to the real-time parameters of the charging pile system, so as to ensure that the expanded capacity can meet the real-time charging demand of the region and the upper transformer is stable and will not be overloaded, and safety is ensured.

[0134] In a further embodiment, whether the transformer has an overload risk is determined according to the real-time power P 变 and a preset transformer overload risk threshold P 变th , specifically including:

[0135] When P 变 >P 变th , it is determined that the transformer has an overload risk; wherein, represents a preset dead zone value.

[0136] Wherein, the real-time energy storage information includes chargeable power P 充i , dischargeable power P 放i and SOC i ; wherein, i=1, 2,..., N.

[0137] In order to avoid transformer overload, in a further embodiment, the corresponding energy storage unit is controlled to discharge according to the real-time parameters of the charging pile system, specifically including:

[0138] According to the real-time power of the transformer and the transformer overload risk threshold, the difference P 差 between the real-time power of the transformer and the transformer overload risk threshold is obtained; wherein, P 差 =P 变 -P 变th ;

[0139] According to the real-time energy storage information of each energy storage unit, it is determined whether each energy storage unit is in a non-charging state;

[0140] If not, that is, there are K energy storage units in a charging state at this time; wherein, 0<K<N;

[0141] Then, the total charging power P 充KSUM of the K energy storage units is calculated according to the real-time energy storage information of the K energy storage units;

[0142] If P 充KSUM ≥P 差 , the K energy storage units are controlled to stop charging; wherein,

[0143]

[0144] If P 充KSUM <P 差 , then control the K energy storage units to stop charging and perform power compensation at the same time, where the compensated power P 补偿 =P 差 -P 充KSUM .

[0145] To avoid transformer overload, in a further embodiment, when there are K energy storage units in a charging state, there are also NK dischargeable energy storage units.

[0146] According to the real-time energy storage information of NK dischargeable energy storage units, the sum of the dischargeable powers P of the NK dischargeable energy storage units is calculated. 可放SUM ;

[0147] If P 可放SUM ≥P 补偿 , then according to the real-time energy storage information of the NK dischargeable energy storage units, P 补偿 Evenly distribute the power to the NK dischargeable energy storage units to obtain a discharge target power for each of the NK dischargeable energy storage units;

[0148] According to the discharge target power of each energy storage unit among the NK dischargeable energy storage units, the corresponding energy storage unit is controlled to discharge.

[0149] The discharge target power of each of the NK dischargeable energy storage units is P ESS放目标i , i=K,K+1,...,N; where, Where, i=K,K+1,...,N.

[0150] In a further embodiment, if P 可放SUM <P 补偿 , then the NK dischargeable energy storage units are controlled to discharge until the dischargeable power of each of the NK dischargeable energy storage units is 0.

[0151] In order to avoid transformer overload, in a further embodiment, when determining whether all energy storage units are in a non-charging state, the method further includes:

[0152] If yes, that is, N energy storage units are all in a non-charging state, then according to the real-time energy storage information of each energy storage unit, P 差 Evenly distribute it to each energy storage unit to obtain the discharge target power of each energy storage unit;

[0153] According to the discharge target power of each energy storage unit, control each energy storage unit to discharge.

[0154] wherein the discharge target power of each energy storage unit is P ESS放目标i , i = 1, 2, …, N;

[0155] wherein,

[0156] In order to ensure that the capacity after expansion can meet the real-time charging demand of the region and the upper transformer is stable and will not be overloaded, in another specific embodiment, according to the real-time parameters of the charging pile system, the corresponding energy storage unit is controlled to charge, specifically including:

[0157] According to the real-time energy storage information of each energy storage unit, it is judged whether each energy storage unit is in a non-charging state;

[0158] If not, that is, at this time, there are K energy storage units in the charging state, and there are N-K energy storage units in the chargeable state; wherein, 0 < K < N;

[0159] According to the real-time energy storage information of the N-K chargeable energy storage units, the chargeable total power P 可充SUM of the N-K energy storage units is calculated; wherein, P 可充SUM = P 变th - P 变 ;

[0160] The chargeable total power P 可充SUM of the N-K energy storage units is evenly distributed to each of the N-K energy storage units, to obtain the charging target power of each of the N-K energy storage units;

[0161] According to the charging target power of each of the N-K energy storage units, the corresponding energy storage unit is controlled to charge.

[0162] wherein the charging target power of each of the N-K energy storage units is P ESS充目标i ,

[0163] In further embodiments, when judging whether each energy storage unit is in a non-charging state, it further includes:

[0164] If yes, that is, when N energy storage units are in a non-charging state, according to the real-time power of the transformer and the transformer overload risk threshold, the difference P 差 between the real-time power of the transformer and the transformer overload risk threshold is obtained; wherein, P 差 = P 变 - P 变th ;

[0165] According to the real-time energy storage information of each energy storage unit, P 差 Evenly distribute it to each energy storage unit to obtain the discharge target power of each energy storage unit;

[0166] According to the discharge target power of each energy storage unit, the discharge of each energy storage unit is controlled to avoid transformer overload.

[0167] The target discharge power of each energy storage unit in this embodiment is P ESS放目标i ,in, Where, i=1,2,...,N.

[0168] Fourthly, Figures 1-4 As shown, the present invention also proposes a flexible control system for a charging pile system, which is applied to the charging pile system described in any one of the second aspects; the flexible control system includes: a flexible management unit and an acquisition unit;

[0169] The acquisition unit is used to obtain the real-time parameters of the charging pile system; wherein the real-time parameters include the real-time power P of the transformer 变 and real-time energy storage information of each energy storage unit;

[0170] The flexible management unit is used to adjust the transformer's real-time power P 变 and the preset transformer overload risk threshold to determine whether the transformer is at risk of overload; if so, the corresponding energy storage unit is controlled to discharge according to the real-time parameters of the charging pile system;

[0171] If not, the corresponding energy storage unit is controlled to charge according to the real-time parameters of the charging pile system.

[0172] This embodiment can obtain the real-time parameters of the charging pile system after expansion, and according to the real-time power P of the transformer 变 and the preset transformer overload risk threshold to determine whether the transformer has an overload risk; if so, the corresponding energy storage unit is controlled to discharge according to the real-time parameters of the charging pile system to reduce the power at the transformer end; if not, the corresponding energy storage unit is controlled to charge according to the real-time parameters of the charging pile system, so as to ensure that the expanded capacity can meet the real-time charging needs of the region and the upper transformer is stable and will not be overloaded, ensuring safety.

[0173] The acquisition unit includes an electric energy monitoring module and N energy storage unit monitoring modules. The electric energy monitoring module is used to obtain the real-time power P of the transformer. 变 , N energy storage unit monitoring modules are used to obtain real-time energy storage information of N energy storage units in a one-to-one correspondence.

[0174] Specifically, the electric energy monitoring module and each energy storage unit monitoring module are in communication connection with the flexible management module.

[0175] In a further embodiment, according to the real-time power P 变 of the transformer and a preset transformer overload risk threshold P 变th , it is determined whether the transformer has an overload risk, specifically including:

[0176] When P 变 >P 变th , it is determined that the transformer has an overload risk; wherein P 变th represents a preset transformer overload risk threshold,

[0177] wherein the real-time energy storage information includes chargeable power P 充i , dischargeable power P 放i and SOC i ; wherein i = 1, 2,..., N.

[0178] In a further embodiment, according to the real-time parameters of the charging pile system, the corresponding energy storage unit is controlled to discharge, specifically including:

[0179] According to the real-time power of the transformer and the transformer overload risk threshold, the difference P 差 between the real-time power of the transformer and the transformer overload risk threshold is obtained; wherein P 差 =P 变 -P 变th .

[0180] According to the real-time energy storage information of each energy storage unit, it is determined whether each energy storage unit is in a non-charging state;

[0181] If not, that is, at this time there are K energy storage units in a charging state; wherein 0 < K < N;

[0182] then according to the real-time energy storage information of the K energy storage units, the total charging power P 充KSUM of the K energy storage units is calculated;

[0183] If P 充KSUM ≥ P 差 , the K energy storage units are controlled to stop charging; wherein,

[0184]

[0185] If P 充KSUM <P 差 , the K energy storage units are controlled to stop charging and simultaneously perform power compensation, wherein the compensated power P 补偿 =P 差 -P充KSUM .

[0186] In a further embodiment, when there are K energy storage units in a charging state, there are also N-K energy storage units that can be discharged;

[0187] According to the real-time energy storage information of the N-K energy storage units that can be discharged, the sum P of the dischargeable power of the N-K energy storage units that can be discharged is calculated 可放SUM ;

[0188] If P 可放SUM ≥ P 补偿 , according to the real-time energy storage information of the N-K energy storage units that can be discharged, P 补偿 is evenly distributed to the N-K energy storage units that can be discharged, to obtain the discharge target power of each of the N-K energy storage units that can be discharged;

[0189] According to the discharge target power of each of the N-K energy storage units that can be discharged, the corresponding energy storage unit is controlled to be discharged.

[0190] Wherein, the discharge target power of each of the N-K energy storage units that can be discharged is P ESS放目标i , i = K, K+1,..., N; wherein, In the formula, i = K, K+1,..., N.

[0191] In a further embodiment, if P 可放SUM < P 补偿 , the N-K energy storage units that can be discharged are controlled to be discharged until the dischargeable power of each of the N-K energy storage units that can be discharged is 0.

[0192] In a further embodiment, when judging whether the energy storage units are all in a non-charging state, it also includes:

[0193] If yes, that is, at this time, the N energy storage units are all in a non-charging state, according to the real-time energy storage information of each energy storage unit, P 差 is evenly distributed to each energy storage unit to obtain the discharge target power of each energy storage unit;

[0194] According to the discharge target power of each energy storage unit, each energy storage unit is controlled to be discharged.

[0195] Wherein, the discharge target power of each energy storage unit is P ESS放目标i , i = 1, 2,..., N;

[0196] Wherein,

[0197] In another specific embodiment, according to the real-time parameters of the charging pile system, the corresponding energy storage units are controlled to charge, specifically including:

[0198] determining whether the real-time power P of the transformer is less than a preset threshold value; wherein the preset threshold value is less than the transformer overload risk threshold value P 变 ; 变th ;

[0199] If yes, according to the real-time energy storage information of each energy storage unit, it is determined whether each energy storage unit is in a non-charging state;

[0200] If no, that is, at this time, K energy storage units are in a charging state, and N-K energy storage units are in a chargeable state; wherein 0

[0201] According to the real-time energy storage information of the N-K chargeable energy storage units, the chargeable total power P 可充SUM of the N-K chargeable energy storage units is calculated; wherein P 可充SUM = P 变th -P 变 ;

[0202] The chargeable total power P 可充SUM of the N-K chargeable energy storage units is evenly distributed to each of the N-K chargeable energy storage units to obtain the charging target power of each of the N-K chargeable energy storage units.

[0203] According to the charging target power of each of the N-K chargeable energy storage units, the corresponding energy storage unit is controlled to charge.

[0204] Wherein, the charging target power of each of the N-K chargeable energy storage units is P ESS充目标i ,

[0205] In further embodiments, when determining whether each energy storage unit is in a non-charging state, it further includes:

[0206] If yes, that is, when N energy storage units are in a non-charging state, according to the real-time power of the transformer and the transformer overload risk threshold value, the difference P 差 between the real-time power of the transformer and the transformer overload risk threshold value is obtained; wherein P 差 = P 变 -P 变th ;

[0207] According to the real-time energy storage information of each energy storage unit, P 差 is evenly distributed to each energy storage unit to obtain the discharge target power of each energy storage unit.

[0208] According to the discharge target power of each energy storage unit, control each energy storage unit to discharge.

[0209] Wherein, the discharge target power of each energy storage unit in the embodiment is P ESS放目标i Wherein, In the formula, i = 1, 2,..., N.

[0210] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art, according to the technical solution and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, should be covered within the protection scope of the present application.

Claims

1. A method for expanding the capacity of a charging pile system, characterized in that: include: Obtaining information about an existing charging pile system in a target area; wherein the information about the existing charging pile system in the target area includes a transformer and N existing charging piles connected to the transformer, wherein input ends of the N existing charging piles are connected to an AC bus and a transformer, respectively; Determine whether all N existing charging piles are AC charging piles; If yes, configure N new charging piles that only support AC input and connect their input terminals to the AC bus; configure a corresponding energy storage unit for each existing charging pile, and connect each energy storage unit between the output terminal of the corresponding existing charging pile and the AC bus; if no, determine whether the N existing charging piles are all DC charging piles; If so, configure a corresponding energy storage unit under each existing charging pile and configure N new charging piles; if the N new charging piles all support both DC and AC input, configure a first DC bus; connect each energy storage unit between the output end of the corresponding existing charging pile and the first DC bus; connect the input end of each new charging pile to the first DC bus and the AC bus respectively; If not, configure N new charging piles and a fourth DC bus that support both AC and DC inputs, and configure a corresponding energy storage unit under each original charging pile, and connect each energy storage unit between the output end of the corresponding original charging pile and the fourth DC bus; connect the input ends of the N new charging piles to the AC bus and the fourth DC bus respectively.

2. The method for expanding the charging pile system according to claim 1, characterized in that: If the N newly added charging piles only support DC input, configure the second DC bus and the third DC bus; connect the output end of each original charging pile to the second DC bus; connect the input end of each energy storage unit to the output end of the corresponding original charging pile; connect the output end of each energy storage unit to the third DC bus; and connect the input end of each newly added charging pile to the second DC bus and the third DC bus respectively.

3. A charging pile system, applied to the capacity expansion method of the charging pile system according to claim 2, characterized in that: include: N energy storage units, N new charging piles, a transformer, and N existing charging piles connected to the transformer; The input ends of the N existing charging piles are connected to the AC bus and the transformer respectively; the N energy storage units are arranged in a one-to-one correspondence with the N existing charging piles; When all N existing charging piles are AC charging piles, and the N newly added charging piles only support AC input, the input end of each newly added charging pile is connected to the AC bus; the input end of each energy storage unit is connected to the output end of the corresponding existing charging pile, and the output end of each energy storage unit is connected to the AC bus; Alternatively, when the N existing charging piles are all DC charging piles, and the N newly added charging piles all support both DC input and AC input, a first DC bus is also included; The input end of each energy storage unit is connected to the output end of the corresponding original charging pile; the output end of each energy storage unit is connected to the first DC bus; the input end of each newly added charging pile is connected to the first DC bus and the AC bus respectively; Alternatively, when the N existing charging piles are all DC charging piles and the N newly added charging piles only support DC input, a second DC bus and a third DC bus are also included; The output of each existing charging pile is connected to the second DC bus; the input of each energy storage unit is connected to the output of the corresponding existing charging pile; the output of each energy storage unit is connected to the third DC bus; the input of each newly added charging pile is connected to the second DC bus and the third DC bus respectively; Alternatively, when there are X original DC charging piles and Y original AC charging piles among the N original charging piles, the N newly added charging piles include X newly added charging piles and Y newly added charging piles; wherein the X newly added charging piles and the Y newly added charging piles both support AC input and DC input; wherein N=X+Y; The system further includes a fourth DC bus; the input end of each energy storage unit is connected to the output end of the corresponding original charging pile, and the output end of each energy storage unit is connected to the fourth DC bus; the input ends of the X newly added charging piles and the Y newly added charging piles are respectively connected to the AC bus and the fourth DC bus.

4. A flexible control method for a charging pile system, applied to the charging pile system according to claim 3, characterized in that: include: Get the real-time parameters of the charging pile system; the real-time parameters include the real-time power of the transformer and real-time energy storage information of each energy storage unit; among which, real-time energy storage information includes rechargeable power , discharge power and ;in, ; According to the real-time power of the transformer and preset transformer overload risk thresholds , determine whether the transformer has an overload risk, If so, the corresponding energy storage unit is controlled to discharge according to the real-time parameters of the charging pile system; If not, the corresponding energy storage unit is controlled to charge according to the real-time parameters of the charging pile system.

5. The flexible control method of the charging pile system according to claim 4, characterized in that: According to the real-time parameters of the charging pile system, the corresponding energy storage unit is controlled to discharge, specifically including: According to the real-time power of the transformer and the transformer overload risk threshold, the difference between the real-time power of the transformer and the transformer overload risk threshold is obtained. ;in, ; According to the real-time energy storage information of each energy storage unit, determine whether each energy storage unit is in a non-charging state; If not, that is, there are K energy storage units in the charging state at this time; among them, 0 <K<N; Then, based on the real-time energy storage information of the K energy storage units, the total charging power of the K energy storage units is calculated. ; like , then control the K energy storage units to stop charging; wherein, ; like , then the K energy storage units are controlled to stop charging and perform power replenishment at the same time; where the compensated power is , .

6. The flexible control method of the charging pile system according to claim 5, characterized in that: When there are K energy storage units in the charging state, there are NK energy storage units that can be discharged; According to the real-time energy storage information of NK dischargeable energy storage units, the sum of the dischargeable powers of the NK dischargeable energy storage units is calculated. ; like , then according to the real-time energy storage information of the NK dischargeable energy storage units, Evenly distribute the power to the NK dischargeable energy storage units to obtain a discharge target power for each of the NK dischargeable energy storage units; controlling the corresponding energy storage unit to discharge according to the discharge target power of each energy storage unit among the NK dischargeable energy storage units; like , then the NK dischargeable energy storage units are controlled to discharge until the dischargeable power of each of the NK dischargeable energy storage units is 0.

7. The flexible control method of the charging pile system according to claim 5, characterized in that: When determining whether all energy storage units are in a non-charging state, the following steps are also included: If yes, that is, at this time, N energy storage units are all in a non-charging state, then according to the real-time energy storage information of each energy storage unit, Evenly distribute it to each energy storage unit to obtain the discharge target power of each energy storage unit; According to the discharge target power of each energy storage unit, each energy storage unit is controlled to discharge.

8. The flexible control method of the charging pile system according to claim 4, characterized in that: According to the real-time parameters of the charging pile system, the corresponding energy storage unit is controlled to charge, including: According to the real-time energy storage information of each energy storage unit, determine whether each energy storage unit is in a non-charging state; If not, that is, there are K energy storage units in the charging state, and there are NK energy storage units in the rechargeable state; where 0 <K<N; According to the real-time energy storage information of the NK rechargeable energy storage units, the total rechargeable power of the NK energy storage units is calculated. ;in, ; The total rechargeable power of the NK energy storage units Evenly distribute the power to each of the NK energy storage units to obtain a charging target power for each of the NK energy storage units; According to the charging target power of each energy storage unit in the NK energy storage units, the charging of the corresponding energy storage unit is controlled.

9. The flexible control method of the charging pile system according to claim 8, characterized in that: When determining whether all energy storage units are in a non-charging state, the following steps are also included: If yes, that is, when all N energy storage units are in a non-charging state, then according to the real-time power of the transformer and the transformer overload risk threshold, the difference between the real-time power of the transformer and the transformer overload risk threshold is obtained. ;in, ; According to the real-time energy storage information of each energy storage unit, Evenly distribute it to each energy storage unit to obtain the discharge target power of each energy storage unit; The discharge of each energy storage unit is controlled according to the discharge target power of each energy storage unit.

10. A flexible control system for a charging pile system, applied to the charging pile system according to claim 3, characterized in that: include: flexible management unit and acquisition unit; The acquisition unit is used to obtain real-time parameters of the charging pile system; wherein the real-time parameters include the real-time power of the transformer and the real-time energy storage information of each energy storage unit; The flexible management unit is used to determine whether the transformer has an overload risk based on the real-time power of the transformer and the preset transformer overload risk threshold; If so, the corresponding energy storage unit is controlled to discharge according to the real-time parameters of the charging pile system; If not, the corresponding energy storage unit is controlled to charge according to the real-time parameters of the charging pile system.

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