Feedback type load

Abstract

A feedback type load comprises a load control unit and m groups of feedback load power units, and m is larger than or equal to 2. Each group of feedback load power units comprises a PDU control unit, n DC + switches and n DC-switches, n is greater than or equal to 2, and the PDU control units in each group of feedback load power units are respectively connected with the n DC + switches and the n DC-switches in the same group of feedback load power units; each PDU control unit is connected with a load control unit through a CAN1 bus; the n DC + switches and the n DC-switches in each group of feedback load power units are connected with the DC / AC modules in the n load modules in a one-to-one correspondence manner to form n channels; and each load module is connected with the load control unit through a CAN2 bus. According to the utility model, the defects in the prior art are overcome, dynamic distribution of multi-channel load power can be effectively realized, and the utilization rate is improved. And the test energy consumption is reduced, and the device is more energy-saving and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, and in particular to a feedback type load. Background Art

[0002] As the construction of electric vehicle charging facilities continues to intensify, in order to reduce the intensity of operation and maintenance work, it is urgent to carry out full inspection of charging piles connected to the network. In order to ensure the smooth implementation of the full inspection work, it is necessary to build an automated testing platform for charging facilities to replace the manual operation part and increase the inspection speed.

[0003] The load is a very important device used to simulate the power battery load of electric vehicles in the charging pile test. During the charging pile test, the load needs to be set to different working states and parameters according to different test items. Some test items do not require the load to participate, and the load is in an idle state. During the entire test process, the actual working time of the load is not long.

[0004] At present, in the production and testing process of many charging piles and switching power supplies, most of them use heat-consuming electronic loads for aging testing, which will increase the user's usage cost, lead to a large amount of carbon emissions and carbon accumulation, and the utilization rate of load power is low. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a feedback load, which overcomes the shortcomings of the prior art, can effectively realize the dynamic distribution of multi-channel load power, improve the utilization rate, and also reduce the test energy consumption, which is more energy-saving and environmentally friendly.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A regenerative load and a load power distribution method thereof, comprising a load control unit and m groups of regenerative load power units, m≥2; each group of regenerative load power units comprises a PDU control unit, n DC+ switches and n DC- switches, n≥2, wherein the PDU control unit in each group of regenerative load power units is respectively connected to the n DC+ switches and n DC- switches in the same group of regenerative load power units;

[0008] Each of the PDU control units is connected to the load control unit via the CAN1 bus; the n DC+ switches and n DC- switches in each group of feedback load power units are respectively connected to the DC / AC modules in the n load modules in a one-to-one correspondence to form n channels; each load module is respectively connected to the load control unit via the CAN2 bus.

[0009] The utility model also discloses a load power distribution method using the above-mentioned feedback load, which is used for power distribution to each load module, including a simple mode distribution method and a custom mode distribution method.

[0010] Preferably, the simple mode allocation method comprises the following steps:

[0011] Step S11: Read the charging parameter and set it to P s ;

[0012] Step S12: power distribution;

[0013] Step S13: power loading; switch the internal switch of each channel PDU to the set load; after the charging voltage reaches the set value, gradually load the current from 0 to the set value;

[0014] Step S14: power unloading, when the load operation time of the n channels reaches the set value, the current is stepped down to 0 within the specified time, and finally the internal switches of the PDU of the n channels are disconnected.

[0015] Preferably, the power allocation in step S12 specifically includes the following steps:

[0016] Step S121: According to the number m of the feedback load power units, the number n of the channels, and the maximum power P supported by each power unit m , calculate the maximum power that can be evenly distributed in each channel: P a =(P m ·m) / n, where: m≥n;

[0017] Step S122: If P s ≤P m , the load control unit directly sets the parameter P s Send to the 0th to mth feedback load power units via CAN2 bus;

[0018] Step S123: If P m <P s ≤P a , each channel requires x power units, which must satisfy Ps≤(Pm·x). Then the load control unit configures x power units into a group through the CAN2 bus and sends parameters P according to the group. s ;

[0019] Step S124: If P s >P a ,Each channel requires x power units, which must satisfy Ps≤(Pm·x), and is allocated on a first-come, first-served basis. The priority is arranged according to the channel number. The smaller the channel number, the higher the priority.

[0020] Preferably, the step S13 of power loading specifically includes the following steps:

[0021] Step S131: During initial allocation, the load is set to zero voltage and zero current; the DC+ switch and DC- switch corresponding to each channel are directly switched to the set load;

[0022] Step S132: After the charging voltage reaches the set value, the current is gradually loaded from 0 to the set value.

[0023] Preferably, the custom mode allocation method comprises the following steps:

[0024] Step S21: Read charging parameter settings of all channels;

[0025] Step S22: power distribution;

[0026] Step S23: power loading; switching the switches of each channel to the set load; after the charging voltage reaches the set value, gradually loading the current from 0 to the set value;

[0027] Step S24: power unloading, when the load operation time of the n channels reaches the set value, the current is stepped down to 0 within the specified time, and finally the internal switches of the PDU of the n channels are disconnected.

[0028] Preferably, the S22 power allocation specifically includes the following steps:

[0029] Step S221: Calculate the number of power units required for all channels;

[0030] Step S222: The allocation is performed on a first-come, first-served basis, with priorities arranged according to channel numbers. The smaller the channel number, the higher the priority.

[0031] Preferably, the step S23 of power loading specifically includes the following steps:

[0032] Step S231: During initial allocation, the load is set to zero voltage and zero current; the DC+ switch and DC- switch corresponding to each channel are directly switched to the set load;

[0033] Step S232: After the charging voltage reaches the set value, the current is gradually loaded from 0 to the set value.

[0034] The utility model provides a feedback load and a load power distribution method thereof. The utility model has the following beneficial effects: the dynamic distribution of multi-channel load power can be effectively realized, the utilization rate can be improved, and the test energy consumption can be reduced, which is more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings required for describing the prior art are briefly introduced below.

[0036] Figure 1 The electrical connection diagram of the utility model;

[0037] Figure 2 Flow chart of the steps of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0039] Embodiment 1

[0040] like Figure 1 As shown, a regenerative load includes a load control unit and m groups of regenerative load power units, m≥2; each group of regenerative load power units includes a PDU control unit, n DC+ switches Km_n+ and n DC- switches Km_n- (m represents the regenerative load power unit number, n represents the channel number), n≥2, wherein the PDU control unit in each group of regenerative load power units is respectively connected to the n DC+ switches and n DC- switches in the same group of regenerative load power units;

[0041] Each PDU control unit is connected to the load control unit through the CAN1 bus; the n DC+ switches Km_n+ and n DC- switches Km_n- in each group of feedback load power units are respectively connected to the DC / AC modules in the n load modules in a one-to-one correspondence to form n channels; each load module is respectively connected to the load control unit through the CAN2 bus.

[0042] Working principle:

[0043] For example: Basic configuration: m=8, n=12, that is, 8 groups of PDU control units, 12 groups of power units, each power unit is 40kW, and the system has a total load power of 480kW.

[0044] S1: Set the power of each gun on the test software, from gun 1 to gun 8, in order: 10kW, 30kW, 50kW, 70kW, 90kW, 110kW, 130kW, 150kW, with a total demand of 640kW;

[0045] S2: Calculate the power units that need to be allocated to guns 1 to 6 in sequence: channel 1 occupies unit 1, channel 2 occupies unit 2, channel 3 occupies units 3-4, channel 4 occupies units 5-6, channel 5 occupies units 7-9, channel 6 occupies units 10-12. According to the first-come-first-served principle, 12 groups of loads have been allocated, and guns 7 and 8 are in no-load charging state.

[0046] S3: Start charging, guns 1 to 6 are in a loaded charging state, and guns 7 and 8 are in a no-load charging state.

[0047] S4: Gun 1-Gun 6 reaches the set charging time, and load groups 1-12 are all unloaded to zero current. All contactors inside the PDU are in the disconnected state.

[0048] S5: Testing completed.

[0049] The above method can effectively realize the dynamic distribution of multi-channel load power and improve the utilization rate. It also reduces the test energy consumption and is more energy-saving and environmentally friendly.

[0050] Embodiment 2

[0051] like Figure 2 As shown, the utility model also discloses a load power distribution method using the above-mentioned feedback load, which is used to distribute power to each load module, including a simple mode distribution method and a custom mode distribution method. In both distribution methods, each power unit can only be distributed to one channel at the same time.

[0052] The simple mode allocation method requires setting a set of charging parameters, and all channels are load-distributed according to the parameters, which specifically includes the following steps:

[0053] Step S11: Read the charging parameter and set it to P s ;

[0054] Step S12: power distribution;

[0055] Step S121: According to the number m of the feedback load power units, the number n of the channels, and the maximum power P supported by each power unit m , calculate the maximum power that can be evenly distributed in each channel: P a =(P m ·m) / n, where: m≥n;

[0056] Step S122: If P s ≤P m , the load control unit directly sets the parameter P s Send to the 0th to mth feedback load power units via CAN2 bus;

[0057] Step S123: If P m <P s ≤P a , each channel requires x power units, which must satisfy Ps≤(Pm·x). Then the load control unit configures x power units into a group through the CAN2 bus and sends parameters P according to the group. s ;

[0058] Step S124: If P s >P a ,Each channel requires x power units, which must satisfy Ps≤(Pm·x), and is allocated on a first-come, first-served basis. The priority is arranged according to the channel number. The smaller the channel number, the higher the priority.

[0059] Step S13: power loading;

[0060] Step S131: During initial allocation, the load is set to zero voltage and zero current; the DC+ switch and DC- switch corresponding to each channel are directly switched to the set load;

[0061] Step S132: After the charging voltage reaches the set value, the current is gradually loaded from 0 to the set value.

[0062] Step S14: power unloading, when the load operation time of the n channels reaches the set value, the current is stepped down to 0 within the specified time, and finally the internal switches of the PDU of the n channels are disconnected.

[0063] The custom mode allocation method requires configuring the charging parameters of each channel separately. It includes the following steps:

[0064] Step S21: Read charging parameter settings of all channels;

[0065] Step S22: power distribution;

[0066] Step S221: Calculate the number of power units required for all channels;

[0067] Step S222: The allocation is performed on a first-come, first-served basis, with priorities arranged according to channel numbers. The smaller the channel number, the higher the priority.

[0068] Step S23: power loading;

[0069] Step S231: During initial allocation, the load is set to zero voltage and zero current; the DC+ switch and DC- switch corresponding to each channel are directly switched to the set load;

[0070] Step S232: after the charging voltage reaches the set value, gradually load the current from 0 to the set value;

[0071] Step S24: power unloading, when the load operation time of the n channels reaches the set value, the current is stepped down to 0 within the specified time, and finally the internal switches of the PDU of the n channels are disconnected.

[0072] The above method can realize the dynamic allocation of multi-channel load power, thereby effectively improving the utilization rate, and reducing the test energy consumption, which is more energy-saving and environmentally friendly.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A feedback load, characterized in that: It includes a load control unit and m groups of regenerative load power units, where m≥2; each group of regenerative load power units includes a PDU control unit, n DC+ switches and n DC- switches, where n≥2, wherein the PDU control unit in each group of regenerative load power units is respectively connected to the n DC+ switches and n DC- switches in the same group of regenerative load power units; Each of the PDU control units is connected to the load control unit via the CAN1 bus; the n DC+ switches and n DC- switches in each group of feedback load power units are respectively connected to the DC / AC modules in the n load modules in a one-to-one correspondence to form n channels; each load module is respectively connected to the load control unit via the CAN2 bus.

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