Electric vehicle charging system, corresponding power regulation and control method and power supply information collector

Abstract

The invention discloses an electric vehicle charging system and a corresponding power regulation and control method and a power supply information acquirer, the electric vehicle charging system comprises an electric energy meter, controlled electric equipment and uncontrolled electric equipment, and each controlled electric equipment is provided with a corresponding energy management terminal. The electric energy meter is connected with the first energy management terminal through the power supply information collector. The power supply information collector is configured to obtain the current instantaneous total active power of the power supply point from the electric energy meter, and calculate the actual operation power of the power supply point based on the current instantaneous total active power of the power supply point and the determined metering multiplying power. Determining the residual power of the current uncontrolled electric equipment based on the maximum output power of the uncontrolled electric equipment configured by the power supply point and the actual operation power of the power supply point, and synchronizing the residual power of the current uncontrolled electric equipment to an energy management terminal network; and each energy management terminal determines the current available active power of the networking based on the residual power of the current uncontrolled electric equipment. The utilization efficiency of the power distribution equipment can be improved.

Description

Technical Field

[0001] The present application relates to the field of electric vehicle charging stations, and in particular to an electric vehicle charging system and a corresponding power control method and a power supply information collector. Background Art

[0002] At present, there are a large number of power points in the market that are connected to controlled and uncontrolled power devices at the same time. However, since the power consumption period and power consumption of uncontrolled power devices are not fixed, in order to ensure the safe operation of the power points, the configuration of controlled power devices can only be limited, that is, the total available power of the power point is determined to be = the maximum operating power of uncontrolled power devices + the maximum operating power of controlled power devices. Although such power device configuration can ensure the safe operation of the power point, it has the following obvious defects:

[0003] 1) The maximum power operation time of uncontrolled electrical equipment is short, resulting in low overall utilization of power points;

[0004] 2) When the total capacity of the power supply point remains unchanged, the number of controlled power-consuming devices is small; and

[0005] 3) When the power factor of the power supply point decreases, the actual active power output efficiency of the power supply point is low.

[0006] When selecting the existing power distribution equipment for construction, the overall power load is evaluated and a portion of the margin is designed to carry out the selection of the power distribution equipment.

[0007] In addition, it is difficult to network the controlled power equipment in the existing power equipment construction. Most of them are realized through wireless networks. Communications are obviously affected by signals, and the power calculation and control delays of equipment are high, which poses great risks.

[0008] Therefore, a system and method for improving the overall utilization efficiency of power distribution equipment is needed. Summary of the invention

[0009] The present invention provides an electric vehicle charging system and a corresponding power control method and a power supply information collector, which can dynamically control the charging power of the electric vehicle charging system, improve the utilization efficiency of the power distribution equipment, and reduce the impact on the power distribution equipment when the equipment uses electricity at the same time.

[0010] In a first aspect of the present invention, an electric vehicle charging system is provided, the electric vehicle charging system comprising an electric energy meter, a controlled electric device and an uncontrolled electric device, each controlled electric device having a corresponding energy management terminal, the electric energy meter is connected to the first energy management terminal via a power supply information collector, each controlled electric device and the uncontrolled electric device are respectively connected to the electric energy meter, wherein the controlled electric device refers to a device whose power can be dynamically adjusted through a data bus, and the uncontrolled electric device refers to a device whose power cannot be dynamically adjusted through a data bus, wherein the power supply information collector is configured as follows:

[0011] - Periodically obtain the current instantaneous total active power P of the power source point from the electric energy meter t ;

[0012] -Based on the current instantaneous total active power P of the power supply point t The actual operating power P of the power supply point is calculated based on the determined metering multiple C, where P = C × P t ;

[0013] - Maximum output power P of uncontrolled electrical equipment based on power point configuration max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power source point. sur , where P sur =P max –P;

[0014] -Synchronize the remaining power of the current uncontrolled electrical equipment to the energy management terminal network through the CAN bus;

[0015] Among them, each energy management terminal determines the currently available active power of the network based on the currently remaining power of the uncontrolled electrical equipment, wherein the currently available active power of the network = the configured total network power + the currently remaining power of the uncontrolled electrical equipment - the real-time total power of all energy management terminals.

[0016] In a second aspect of the present invention, a power control method for an electric vehicle charging system is provided, wherein the electric vehicle charging system comprises an electric energy meter, a controlled electric device and an uncontrolled electric device, each controlled electric device has a corresponding energy management terminal, the electric energy meter is connected to the first energy management terminal via a power supply information collector, and each controlled electric device and uncontrolled electric device is connected to the electric energy meter, respectively, wherein the controlled electric device refers to a device whose power can be dynamically adjusted through a data bus, and the uncontrolled electric device refers to a device whose power cannot be dynamically adjusted through a data bus, wherein the method comprises:

[0017] The power information collector periodically obtains the current instantaneous total active power P of the power point from the electric energy meter. t ;

[0018] The power information collector is used to collect the current instantaneous total active power P of the power source point. t And the determined metering multiple C calculates the actual operating power P of the power supply point, where P = C × P t ;

[0019] The maximum output power P of uncontrolled electrical equipment configured based on the power point through the power information collector max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power source point. sur , where Psur =P max –P;

[0020] The remaining power of the current uncontrolled electrical equipment is synchronized to the energy management terminal network through the CAN bus through the power information collector;

[0021] Each energy management terminal determines the currently available active power of the network based on the currently remaining power of the uncontrolled electrical equipment, wherein the currently available active power of the network = the configured total network power + the currently remaining power of the uncontrolled electrical equipment - the real-time total power of all energy management terminals.

[0022] In a third aspect of the present invention, a power information collector for use in an electric vehicle charging system is provided, wherein the electric vehicle charging system comprises an electric energy meter, a controlled electric device and an uncontrolled electric device, each controlled electric device has a corresponding energy management terminal, the electric energy meter is connected to the first energy management terminal via the power information collector, and each controlled electric device and uncontrolled electric device is connected to the electric energy meter, respectively, wherein the controlled electric device refers to a device whose power can be dynamically adjusted through a data bus, and the uncontrolled electric device refers to a device whose power cannot be dynamically adjusted through a data bus, wherein the power information collector is configured as follows:

[0023] - Periodically obtain the current instantaneous total active power P of the power source point from the electric energy meter t ;

[0024] -Based on the current instantaneous total active power P of the power supply point t The actual operating power P of the power supply point is calculated based on the determined metering multiple C, where P = C × P t ;

[0025] - Maximum output power P of uncontrolled electrical equipment based on power point configuration max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power source point. sur , where P sur =P max –P;

[0026] -Synchronize the remaining power of the current uncontrolled electrical equipment to the energy management terminal network through the CAN bus to regulate the current available active power of the network.

[0027] Through the present invention, when the current residual power of the uncontrolled electrical equipment is positive, the controlled electrical equipment can use this part of the residual power, and when the current residual power of the uncontrolled electrical equipment is zero or negative, since the uncontrolled electrical equipment cannot be adjusted, in order to ensure the normal operation of the distribution equipment, it is necessary to reduce the available distribution capacity of the controlled electrical equipment to ensure that all equipment under the power supply point can operate normally, thereby realizing dynamic regulation of the charging power based on the data collected by the electric energy meter, realizing the compensation and exchange of distribution capacity between different electrical equipment, effectively improving the overall utilization efficiency of the distribution equipment, and realizing the reuse of the residual distribution capacity of the power supply, such as outputting the residual capacity of the charging station to the energy storage or battery swap station for use.

[0028] In addition, when all devices are used at the same time, the capacity obtained by each electrical device from the transformer is random, and the total capacity of all electrical devices added up to the instantaneous capacity may exceed the total distribution capacity for a short time. The present invention controls all electrical devices as a whole to ensure that the total capacity does not exceed the system limit capacity (the system limit capacity is less than the transformer distribution capacity) at any time, thereby reducing the impact on the distribution equipment when the devices are using electricity at the same time, and making the output of the distribution equipment more stable.

[0029] In addition, the present invention can reflect the comprehensive indicators of power consumption of controlled power equipment and uncontrolled power equipment. By comparing the power curves of controlled power equipment and uncontrolled power equipment, the operation status of the entire power distribution equipment can be effectively understood, which is convenient for better optimization of power equipment configuration in the later stage.

[0030] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. 4 is a schematic block diagram of an electric vehicle charging system according to the present invention.

[0032] The figures are schematic and simplified for the sake of clarity, and they merely show details which are essential to the understanding of the invention, while other details are left out. DETAILED DESCRIPTION

[0033] The following describes in detail the embodiments and examples of the present invention with reference to the accompanying drawings.

[0034] The scope of applicability of the present invention will become apparent from the detailed description given below. However, it should be understood that while the detailed description and specific examples indicate preferred embodiments of the present invention, they are given for illustrative purposes only.

[0035] Figure 1A schematic block diagram of an electric vehicle charging system according to the present invention is shown. The electric vehicle charging system includes a transformer, an electric energy meter such as a smart meter, a controlled electric device and an uncontrolled electric device. A controlled electric device refers to a device whose power can be dynamically adjusted through a data bus, and an uncontrolled electric device refers to a device whose power cannot be dynamically adjusted through a data bus. Controlled electric devices include energy storage devices and / or DC charging piles. Uncontrolled electric devices include air conditioners, monitoring equipment, lighting equipment, and / or AC charging piles. The electric devices are divided into controlled electric devices and uncontrolled electric devices, which simplifies the classification management of different power loads under the same power supply point. Each controlled electric device has a corresponding energy management terminal PCM, and the electric energy meter is connected to the first energy management terminal PCM through a signal line via a power supply information collector PSM. Each controlled electric device and uncontrolled electric device is connected to the electric energy meter through an energy line respectively, and each energy management terminal PCM is connected to each other through a signal line, and the signal line is also connected to a communication host.

[0036] The power information collector may include, for example, an MCU and a (e.g., 4G) communication module, using 220V AC power supply, and having an RS485 interface, a CAN interface, and an infrared interface. The power information collector reads the electric energy meter data through the RS485 bus, and then uploads the data to the control platform through the 4G module. At the same time, the power information collector also communicates the sampled data with the energy management terminal through the CAN bus.

[0037] The power information collector is configured to periodically obtain the current instantaneous total active power P of the power point from the power meter through a signal line such as an RS485 bus. t According to the multi-function electric energy meter communication protocol (DL / T 645-1997, DL / T 645-2007), the power information collector can actively read the current real-time data of the electric energy meter. The specific indicators are as follows:

[0038] Serial number Indicator name unit Remark 1 Combined active total energy kWh 2 Active energy during peak hours kWh 3 Active energy during peak hours kWh 4 Active energy in normal period kWh 5 Off-peak active energy kWh 6 Total forward active energy kWh 7 Total reverse active energy kWh 8 Phase A voltage V 9 Phase B voltage V 10 Phase C voltage V 11 Phase A current A 12 Phase B current A 13 Phase C current A 14 Instantaneous total active power kW 15 Instantaneous total reactive power kvar 16 Instantaneous total apparent power kVA

[0039] The power information collector is also configured to obtain the current instantaneous total active power P of the power point based on the acquired t And the determined metering multiple C calculates the actual operating power P of the power supply point, where P = C × P t. The metering multiplier reflects the degree of response of the metering device to changes in the input quantity. The higher the multiplier, the more sensitive the device is to small changes in the measured physical quantity. Within a certain measurement range, the metering multiplier determines the resolution of the measurement. For example, a sensor with a range of 100 units and a metering multiplier of 10 has a resolution of 10 units, which means that the smallest change that the sensor can distinguish is 10 units. The metering multiplier C is determined based on the parameters of the voltage transformer and / or current transformer connected to the electric energy meter, such as the voltage transformation ratio and / or current transformation ratio marked on the nameplate of the voltage transformer and / or current transformer. In the case where both voltage transformers and current transformers exist, the corresponding voltage transformation ratio and current transformation ratio can be multiplied together as the metering multiplier.

[0040] The power information collector is also configured to calculate the maximum output power P of the uncontrolled power-consuming device based on the power point configuration. max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power point calculated sur , where P sur =P max –P. The maximum output power of the configured uncontrolled power-consuming device is the sum of the maximum output powers of all uncontrolled power-consuming devices.

[0041] The power information collector is also configured to synchronize the remaining power of the current uncontrolled electrical equipment to the energy management terminal network through the CAN bus. The power information collector simulates itself as an energy management terminal and performs data communication according to the "Energy Management Terminal Communication Protocol" in the electric vehicle charging system. sur Synchronize to the energy management terminal network via the CAN bus.

[0042] Each energy management terminal in the electric vehicle charging system receives the remaining power P of the current uncontrolled power consumption equipment. sur When obtaining data, the currently available active power of the network is recalculated based on the remaining power of the current uncontrolled electrical equipment. According to the electric vehicle charging system standards (GB / T 27930-2011, GB / T 27930-2015, T / GAEPA 002-2023), the energy management terminal can obtain electric vehicle charging-related data in real time during the charging process. Among them, DC charging is based on the "Communication Protocol between Off-board Conductive Chargers and Battery Management Systems for Electric Vehicles", which can obtain data such as voltage demand Vneed, current demand Ineed, charger output voltage Vout, charger output current Iout, battery state of charge SOC (%), charging time t, etc. The currently available active power of the network = the configured total network power + the currently remaining power P of uncontrolled electrical equipment. sur- Real-time total power of all energy management terminals. The configured total network power is the maximum power configured according to the actual networking situation. The real-time total power of all energy management terminals is calculated by periodically (e.g., 250ms / time) adding up the loads of all current power-consuming devices on the data bus. Depending on the specific situation, the current remaining power P of the uncontrolled power-consuming device sur It can be positive or negative. sur >0, it means that there is surplus power distribution capacity allocated to uncontrolled power-consuming equipment, and other controlled power-consuming equipment can use this surplus capacity. sur When ≤0, it means that there is no remaining distribution capacity allocated to uncontrolled power consumers. Since uncontrolled power consumers cannot be adjusted, in order to ensure the normal operation of the distribution equipment, it is necessary to reduce the available distribution capacity of the controlled power consumers to ensure the normal operation of all equipment under the power point.

[0043] The present invention realizes dynamic control of charging power based on data collected by electric energy meters, such as the cross-use of distribution capacity by charging piles in residential garages and residents' daily electrical appliances. At the same time, it realizes the compensation exchange of distribution capacity between different electrical appliances, effectively improves the overall utilization efficiency of distribution equipment, and realizes the reuse of surplus distribution capacity of power supply, such as outputting the surplus capacity of charging stations to energy storage or battery swap stations.

[0044] Furthermore, unlike the prior art which selects the type of power distribution equipment by evaluating the overall power-consuming equipment and designing a portion of margin, the present invention enables the selection of the type of power distribution equipment to be performed according to the full power.

[0045] In another embodiment, the present invention provides a power control method for an electric vehicle charging system, wherein the electric vehicle charging system includes an electric energy meter, a controlled electric device and an uncontrolled electric device, each controlled electric device has a corresponding energy management terminal, the electric energy meter is connected to the first energy management terminal via a power information collector, and each controlled electric device and uncontrolled electric device is connected to the electric energy meter, respectively, wherein the controlled electric device refers to a device whose power can be dynamically adjusted through a data bus, and the uncontrolled electric device refers to a device whose power cannot be dynamically adjusted through a data bus, wherein the method includes:

[0046] The power information collector periodically obtains the current instantaneous total active power P of the power point from the electric energy meter. t ;

[0047] The power information collector is used to collect the current instantaneous total active power P of the power source point. t And the determined metering multiple C calculates the actual operating power P of the power supply point, where P = C × P t ;

[0048] The maximum output power P of uncontrolled electrical equipment configured based on the power point through the power information collector max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power source point. sur , where P sur =P max –P;

[0049] The remaining power of the current uncontrolled electrical equipment is synchronized to the energy management terminal network through the CAN bus through the power information collector;

[0050] Each energy management terminal determines the currently available active power of the network based on the currently remaining power of the uncontrolled electrical equipment, wherein the currently available active power of the network = the configured total network power + the currently remaining power of the uncontrolled electrical equipment - the real-time total power of all energy management terminals.

[0051] When appropriately replaced by corresponding processes, some or all structural features of the electric vehicle charging system described above can be combined with the implementation of the method of the present invention, and vice versa. The implementation of the method has the same advantages as the corresponding system.

[0052] In another embodiment, the present invention provides a power information collector used in an electric vehicle charging system, wherein the electric vehicle charging system includes an electric energy meter, a controlled electric device and an uncontrolled electric device, each controlled electric device has a corresponding energy management terminal, the electric energy meter is connected to the first energy management terminal via the power information collector, and each controlled electric device and uncontrolled electric device is connected to the electric energy meter, wherein the controlled electric device refers to a device whose power can be dynamically adjusted through a data bus, and the uncontrolled electric device refers to a device whose power cannot be dynamically adjusted through a data bus, wherein the power information collector is configured as follows:

[0053] - Periodically obtain the current instantaneous total active power P of the power source point from the electric energy meter t ;

[0054] -Based on the current instantaneous total active power P of the power supply point t And the determined metering multiple C calculates the actual operating power P of the power supply point, where P = C × P t ;

[0055] - Maximum output power P of uncontrolled electrical equipment based on power point configuration max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power source point. sur , where P sur =P max –P;

[0056] -Synchronize the remaining power of the current uncontrolled electrical equipment to the energy management terminal network through the CAN bus to regulate the current available active power of the network.

[0057] The multiple different embodiments described herein or their specific features, structures or characteristics may be appropriately combined in one or more embodiments of the present invention. In addition, in some cases, as long as appropriate, the order of steps in the flow chart and / or the pipeline process description may be modified and does not have to be performed in the exact order described. In addition, multiple different aspects of the present invention may be implemented using software, hardware, firmware or a combination thereof and / or other computer-implemented modules or devices that perform the functions described. The software implementation of the present invention may include executable code stored in a computer-readable medium and executed by one or more processors. The computer-readable medium may include a computer hard drive, ROM, RAM, flash memory, portable computer storage media such as CD-ROM, DVD-ROM, flash drive and / or other devices with a universal serial bus (USB) interface, and / or any other suitable tangible or non-transient computer-readable medium or executable code may be stored on it and executed by a processor. The present invention may be used in conjunction with any suitable operating system.

[0058] Unless explicitly stated, the singular forms "a", "the" and "the" used herein include the plural meaning (i.e., have the meaning of "at least one"). It should be further understood that the terms "having", "including" and / or "comprising" used in the specification indicate the presence of the described features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or their combinations. The term "and / or" as used herein includes any and all combinations of one or more of the listed related items.

[0059] Some preferred embodiments of the present invention have been described above, but it should be emphasized that the present invention is not limited to these embodiments, but can be implemented in other ways within the scope of the subject matter of the present invention. Those skilled in the art can make various variations and modifications to the present invention based on the inspiration of the technical concept of the present invention and without departing from the content of the present invention, and these variations or modifications still fall within the protection scope of the present invention.

Claims

1. An electric vehicle charging system, comprising an electric energy meter, a controlled electric device and an uncontrolled electric device, each controlled electric device having a corresponding energy management terminal, the electric energy meter being connected to a first energy management terminal via a power information collector, each controlled electric device and uncontrolled electric device being connected to the electric energy meter, wherein the controlled electric device refers to a device whose power can be dynamically adjusted via a data bus, and the uncontrolled electric device refers to a device whose power cannot be dynamically adjusted via a data bus, wherein the power information collector is configured as follows: - Periodically obtain the current instantaneous total active power P of the power source point from the electric energy meter t ; -Based on the current instantaneous total active power P of the power supply point t The actual operating power P of the power supply point is calculated based on the determined metering multiple C, where P = C × P t ; - Maximum output power P of uncontrolled electrical equipment based on power point configuration max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power source point. sur , where P sur =P max –P; -Synchronize the remaining power of the current uncontrolled electrical equipment to the energy management terminal network through the CAN bus; in, Each energy management terminal determines the currently available active power of the network based on the currently remaining power of the uncontrolled electrical equipment, where the currently available active power of the network = the configured total network power + the currently remaining power of the uncontrolled electrical equipment - the real-time total power of all energy management terminals.

2. The electric vehicle charging system according to claim 1, characterized in that: The metering multiplier is determined according to the voltage and current transformer parameters connected to the electric energy meter.

3. The electric vehicle charging system according to claim 1, characterized in that: The power information collector performs data communication according to the "Energy Management Terminal Communication Protocol" in the electric vehicle charging system.

4. The electric vehicle charging system according to claim 1, characterized in that: The uncontrolled electrical equipment includes air conditioners, monitoring equipment, lighting equipment, and / or AC charging piles.

5. The electric vehicle charging system according to claim 1, characterized in that: The controlled electrical equipment includes energy storage equipment and / or a DC charging pile.

6. A power control method for an electric vehicle charging system, wherein the electric vehicle charging system comprises an electric energy meter, a controlled electric device and an uncontrolled electric device, each controlled electric device has a corresponding energy management terminal, the electric energy meter is connected to the first energy management terminal via a power information collector, and each controlled electric device and uncontrolled electric device is connected to the electric energy meter, wherein the controlled electric device refers to a device whose power can be dynamically adjusted through a data bus, and the uncontrolled electric device refers to a device whose power cannot be dynamically adjusted through a data bus, wherein the method comprises: The power information collector periodically obtains the current instantaneous total active power P of the power point from the electric energy meter. t ; The power information collector is used to collect the current instantaneous total active power P of the power source point. t The actual operating power P of the power supply point is calculated based on the determined metering multiple C, where P = C × P t ; The maximum output power P of uncontrolled electrical equipment configured based on the power point through the power information collector max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power source point. sur , where P sur =P max –P; The remaining power of the current uncontrolled electrical equipment is synchronized to the energy management terminal network through the CAN bus through the power information collector; Each energy management terminal determines the currently available active power of the network based on the currently remaining power of the uncontrolled electrical equipment, wherein the currently available active power of the network = the configured total network power + the currently remaining power of the uncontrolled electrical equipment - the real-time total power of all energy management terminals.

7. The power control method according to claim 6, characterized in that: The metering multiplier is determined according to the voltage and current transformer parameters connected to the electric energy meter.

8. The power control method according to claim 6, characterized in that: The power information collector performs data communication according to the "Energy Management Terminal Communication Protocol" in the electric vehicle charging system.

9. A power information collector used in an electric vehicle charging system, wherein the electric vehicle charging system includes an electric energy meter, a controlled electric device and an uncontrolled electric device, each controlled electric device has a corresponding energy management terminal, the electric energy meter is connected to the first energy management terminal via the power information collector, and each controlled electric device and uncontrolled electric device is connected to the electric energy meter, wherein the controlled electric device refers to a device whose power can be dynamically adjusted through a data bus, and the uncontrolled electric device refers to a device whose power cannot be dynamically adjusted through a data bus, wherein the power information collector is configured as follows: - Periodically obtain the current instantaneous total active power P of the power source point from the electric energy meter t ; -Based on the current instantaneous total active power P of the power supply point t The actual operating power P of the power supply point is calculated based on the determined metering multiple C, where P = C × P t ; - Maximum output power P of uncontrolled electrical equipment based on power point configuration max The remaining power P of the current uncontrolled electrical equipment is determined by the actual operating power P of the power source point. sur , where P sur =P max –P; -Synchronize the remaining power of the current uncontrolled electrical equipment to the energy management terminal network through the CAN bus to regulate the current available active power of the network.

10. The power supply information collector according to claim 9, characterized in that: The power information collector performs data communication according to the "Energy Management Terminal Communication Protocol" in the electric vehicle charging system.

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