A control method and system for dynamically adjusting charging according to power grid load

Abstract

The application provides a control method and system for dynamically adjusting charging according to power grid load, and relates to the technical field of intelligent charging of new energy vehicles, wherein the method comprises the following steps: receiving a charging instruction; detecting a power grid voltage value and judging whether the power grid voltage value reaches a normal threshold value; if it is detected that the power grid voltage does not continuously reach the normal threshold value within a first set time length, storing the charging instruction and suspending execution of the charging instruction within a second set time length; repeating the above two steps, and if it is detected that the power grid voltage continuously reaches the normal threshold value within the first set time length or the cumulative length of suspension of execution of the charging instruction reaches a third set time length, executing the charging instruction. The technical scheme solves the technical problem of energy waste caused by low charging power and prolonged charging time under the working condition of low power grid voltage in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent charging of new energy vehicles, and in particular to a control method and system for dynamically adjusting charging according to power grid load. BACKGROUND

[0002] With the penetration of electric vehicles, the public power grid has shown an abnormal "zero peak" phenomenon; the reason is that the power grid has introduced a preferential electricity price period to regulate the power of the peak and valley; electric vehicles will start charging only in the preferential electricity price period; but the current power grid capacity cannot meet the demand of a large number of electric vehicles starting charging at the same time in time, resulting in a short power peak in the preferential electricity price starting period, which will cause the voltage to drop for a period of time; and the voltage drop will result in low OBC charging power, thereby resulting in long charging time, so the energy consumed during the charging process increases with the extension of the charging time, resulting in low charging efficiency and energy waste. SUMMARY

[0003] The purpose of the present application is to provide a control method and system for dynamically adjusting charging according to power grid load, to solve the technical problem of energy waste caused by low charging power and long charging time in the working condition of low power grid voltage in the prior art. The preferred technical solutions in the technical solutions provided by the present application can produce the technical effects described below.

[0004] To achieve the above-mentioned purpose, on the one hand, the present application provides a control method for dynamically adjusting charging according to power grid load, comprising:

[0005] receiving a charging instruction;

[0006] detecting a power grid voltage value and determining whether the power grid voltage value reaches a normal threshold value;

[0007] if it is detected that the power grid voltage does not continuously reach the normal threshold value within a first set time period, storing the charging instruction and suspending execution of the charging instruction within a second set time period;

[0008] determining whether the power grid voltage value reaches the normal threshold value, if it is detected that the power grid voltage continuously reaches the normal threshold value within the first set time period or the cumulative time length of suspending execution of the charging instruction reaches a third set time length, executing the charging instruction.

[0009] In some embodiments, the first set time period is set to between 5 seconds and 10 seconds.

[0010] In some embodiments, the normal threshold value of the power grid voltage is set to 215V.

[0011] In some embodiments, the second set time period is set to between 25 minutes and 30 minutes.

[0012] In some embodiments, the third set duration is set between 1.5 hours and 2.5 hours.

[0013] In another aspect, the present application provides a control system for dynamically adjusting charging according to power grid load, comprising:

[0014] an instruction module for receiving a charging instruction;

[0015] a voltage value acquisition module for detecting a power grid voltage value and determining whether the power grid voltage value reaches a normal threshold value;

[0016] an execution module for, if it is determined that the power grid voltage does not continuously reach the normal threshold value within a first set duration, storing the charging instruction and suspending execution of the charging instruction within a second set duration; and,

[0017] if it is determined that the power grid voltage continuously reaches the normal threshold value within the first set duration or the cumulative duration of suspending execution of the charging instruction reaches a third set duration, executing the charging instruction.

[0018] In some embodiments, the first set duration is set between 5 seconds and 10 seconds.

[0019] In some embodiments, the normal threshold value of the power grid voltage is set as 215V.

[0020] In some embodiments, the second set duration is set between 25 minutes and 30 minutes.

[0021] In some embodiments, the third set duration is set between 1.5 hours and 2.5 hours.

[0022] The technical solution of the present application can include the following beneficial effects:

[0023] The control method and system for dynamically adjusting charging according to power grid load provided by the present application, in the charging process, according to the formula T=Q / (Pη), the charging current value is constant, the lower the charging voltage, the longer the time, and the more energy consumed. In the present scheme, different strategies are processed according to the detected alternating voltage; when the power grid voltage is lower than a certain value, the charging is actively suspended; after a certain time interval, it is automatically woken up and the power grid voltage is re-detected, if the power grid voltage is stable and higher than a certain value, it re-enters the charging process; otherwise, continue to charge, and set the cumulative suspension time not to exceed a certain value, so that the actual charging time will not be too long and cause energy waste. As can be seen, the technical solution solves the technical problem of energy waste caused by low charging power and prolonged charging time in the existing technology under the condition of low power grid voltage. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated into and constitute a part of this specification. The embodiments of the application, and their

[0025] Figure 1 A flowchart of a control method for dynamically adjusting charging according to power grid load for an embodiment of the application;

[0026] Figure 2 Another flowchart of a control method for dynamically adjusting charging according to power grid load for an embodiment of the application;

[0027] Figure 3 A structural diagram of a control system for dynamically adjusting charging according to power grid load for an embodiment of the application. DETAILED DESCRIPTION

[0028] The application will be described in greater detail with reference to the drawings, in which embodiments of the application are shown. It should be kept in mind that the application can claim multiple embodiments and that combinations of features of embodiments of the application can be combined with each other.

[0029] The following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the example embodiments of the application.

[0030] The application solves the problem of energy waste caused by low charging power and prolonged charging time under the condition of low grid voltage. For a certain on-board charger OBC, the output power is closely related to the AC voltage provided by the grid.

[0031] For example, using a common AC charging control strategy on the market, when charging is started, the charging pile is started, the whole vehicle is woken up, the vehicle controller VCU sends a working instruction to the OBC, and at the same time the VCU sends a charging current request and a charging voltage request. The OBC judges the AC voltage and its own fault to meet the working conditions, and after entering the working state, the OBC outputs the required voltage and current according to the VCU request value. When the OBC is working, the vehicle obviously needs to be in working mode, and each high-voltage power module of the whole vehicle needs to work, the controller needs to communicate, the cooling system needs to operate, and in extreme cases, the electronic fan or compressor cooling parts need to be started. It is generally considered that the power consumed in the charging mode is about 400-500W.

[0032] According to the parameters of a certain vehicle, it is configured with an 82kWh battery and a 6.6kW OBC, and the OBC charging efficiency is 94%.

[0033] Charging from SOC=0 to SOC=100, the charging time is calculated according to the formula T=Q / (Peta), which takes about 14 hours;

[0034] If the grid voltage is lower than the standard 220V voltage, the output power of the OBC will inevitably decrease due to the current value being limited to 32A. If the grid voltage is 200V, the charging time will increase by 1.1 times, to 15.4 hours, and the additional waste of energy will be 1.4*0.5=0.9kWh; if the grid voltage is 180V, the charging time will increase by 1.22 times, to 17.1 hours, and the additional waste of energy will be 3.1*0.5=1.55kWh; thus, the lower the grid voltage, the longer the charging time, and the more energy wasted.

[0035] In the process of solving the above technical problems, the application proposes that the OBC processes different strategies according to the detected alternating voltage during the charging process; when the grid voltage is lower than a certain value, the OBC actively suspends charging; after a certain interval of time, the OBC wakes up by itself, re-detects the grid voltage, and if the grid voltage is stably higher than a certain value, it re-enters the charging process; otherwise, it continues charging, and the cumulative suspension time does not exceed 2h.

[0036] As shown in Figure 1 The application provides a control method for dynamically adjusting charging according to grid load, which comprises:

[0037] S110: receiving a charging instruction;

[0038] S120: detecting a grid voltage value and judging whether the grid voltage value reaches a normal threshold value;

[0039] S130: if it is detected that the grid voltage does not continuously reach the normal threshold value within a first set time length, storing the charging instruction and suspending execution of the charging instruction within a second set time length;

[0040] S140: judging whether the grid voltage value reaches the normal threshold value, if it is detected that the grid voltage continuously reaches the normal threshold value within the first set time length or the cumulative length of suspension of execution of the charging instruction reaches a third set time length, executing the charging instruction; if it is detected that the grid voltage does not continuously reach the normal threshold value within the first set time length, storing the charging instruction and re-performing the judgment of whether the grid voltage value reaches the normal threshold value after suspending execution of the charging instruction within the second set time length.

[0041] In some embodiments, the first set time length is set between 5 seconds and 10 seconds.

[0042] In some embodiments, the normal threshold value of the grid voltage is set to 215V.

[0043] In some embodiments, the second set duration is set between 25 minutes and 30 minutes.

[0044] In some embodiments, the third set duration is set between 1.5 hours and 2.5 hours.

[0045] Specifically, as shown in Figure 2 the user plugs in the gun, the vehicle starts charging, the VCU 3 sends a charging instruction to the OBC 2; the charging pile 1 closes the relay and outputs an AC voltage to the OBC 2; the OBC 2 judges whether the AC voltage is normal in real time, and the judgment condition for judging whether the grid voltage is normal can be set as: the L-phase voltage is greater than or equal to 215V and lasts for 5s; if it is normal, the charging process is executed according to the charging process.

[0046] If it is not normal, the charging instruction is stored; the OBC 2 suspends charging for 30min; the whole vehicle enters a dormant state; after the timing ends, the OBC 2 is awakened by the RTC; the grid voltage is re-detected to determine whether it is a normal voltage; if the grid voltage meets the judgment condition of the normal voltage, the charging process is executed according to the charging process; if the grid voltage does not meet the judgment condition of the normal voltage, and the cumulative suspension time within the current plug-in period is less than 2h, the OBC 2 repeats the above steps of judging whether the AC voltage is normal in real time until the cumulative suspension time within the current plug-in period is less than 2h, and then the charging process is executed according to the flow.

[0047] On the other hand, as shown in Figure 3 the application provides a control system for dynamically adjusting charging according to grid load, comprising:

[0048] an instruction module 10 for receiving a charging instruction;

[0049] a voltage value acquisition module 20 for detecting a grid voltage value and judging whether the grid voltage value reaches a normal threshold;

[0050] an execution module 30 for storing the charging instruction and suspending execution of the charging instruction within a second set duration when it is judged that the grid voltage does not continuously reach the normal threshold within a first set duration; and

[0051] executing the charging instruction when it is judged that the grid voltage continuously reaches the normal threshold within the first set duration or the cumulative duration of suspending execution of the charging instruction reaches a third set duration.

[0052] In some embodiments, the first set duration is set between 5 seconds and 10 seconds.

[0053] In some embodiments, the normal threshold of the grid voltage is set to 215 V.

[0054] In some embodiments, the second set duration is set between 25 minutes and 30 minutes.

[0055] In some embodiments, the third set duration is set between 1.5 hours and 2.5 hours.

[0056] It is apparent that for the present application a large number of variations can be made while the features and technical concepts of the application remain unchanged. As is readily apparent, the embodiments described above as examples are only some of the infinite possibilities for realising the present application, and therefore they must be considered as illustrative and not restrictive. Any alterations and / or additions to, or omissions from, the method and apparatus described herein which are obvious

[0057] As will be appreciated by one skilled in the art, embodiments of the present application can be comprised of a method, a system, or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.

[0058] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It is understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams block or blocks. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 means for (an apparatus with) one or more functions specified in one or more of the flowchart illustrations and / or block diagrams.

[0059] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart illustrations and / or block diagrams block or blocks. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1 means for (an apparatus with) one or more functions specified in one or more of the flowchart illustrations and / or block diagrams.

[0060] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart illustrations and / or block diagrams block or blocks. Figure 1 one or more functions specified in one or more of the flowchart illustrations and / or block diagrams. Figure 1steps of the functions specified in the one or more blocks.

[0061] It should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or equivalent replaced without departing from the spirit and scope of the present application, and any modification or equivalent replacement should be covered in the protection scope of the claims of the present application.

Claims

1. A control method of dynamically adjusting charging according to power grid load, characterized by, Comprising: receiving a charging instruction; detecting a grid voltage value and determining whether the grid voltage value reaches a normal threshold value; if it is detected that the grid voltage does not continuously reach the normal threshold value within a first set time length, storing the charging instruction and suspending execution of the charging instruction within a second set time length; determining whether the grid voltage value reaches the normal threshold value, and if it is detected that the grid voltage continuously reaches the normal threshold value within the first set time length or the cumulative length of suspending execution of the charging instruction reaches a third set time length, executing the charging instruction; the first set time length is set between 5 seconds and 10 seconds; the normal threshold value of the grid voltage is set to 215V; the second set time length is set between 25 minutes and 30 minutes; the third set time length is set between 1.5 hours and 2.5 hours.

2. A control system for dynamically adjusting charging according to grid load, characterized by, Comprising: an instruction module for receiving a charging instruction; a voltage value acquisition module for detecting a grid voltage value and determining whether the grid voltage value reaches a normal threshold value; an execution module for storing the charging instruction and suspending execution of the charging instruction within a second set time length if it is determined that the grid voltage does not continuously reach the normal threshold value within a first set time length; and, executing the charging instruction if it is determined that the grid voltage continuously reaches the normal threshold value within the first set time length or the cumulative length of suspending execution of the charging instruction reaches a third set time length; the first set time length is set between 5 seconds and 10 seconds; the normal threshold value of the grid voltage is set to 215V; the second set time length is set between 25 minutes and 30 minutes; the third set time length is set between 1.5 hours and 2.5 hours.

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