Safety evaluation method and device for access of direct current charging equipment to power grid

Abstract

The invention discloses a safety evaluation method and device for access of direct current charging equipment to a power grid. The method comprises the following steps: S1, pre-evaluation: preliminarily evaluating the technical specification and design characteristics of the charging equipment; s2, demand analysis: determining security elements needing to be monitored, and determining the category of a monitoring module; s3, distribution and debugging of the monitoring modules: reasonably distributing the monitoring modules; monitoring is carried out regularly, and data are recorded and analyzed; and S4, comprehensive evaluation: according to data monitored by each module, performing comprehensive evaluation and producing an evaluation report. According to the invention, omnibearing monitoring of the DC charging equipment can be realized, and the safety of the DC charging equipment accessing a power grid is ensured; and accurate safety evaluation can be realized through omnibearing monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of safety evaluation of charging equipment connected to a power grid, and in particular to a method and device for safety evaluation of direct current charging equipment connected to a power grid. Background Art

[0002] The increasing energy crisis and environmental pollution have accelerated the development of electric vehicles, and electric vehicles have become an extremely important load in the future power grid. With the rapid development of electric vehicles, DC charging equipment for electric vehicles has been put into operation on a large scale. The essence of DC charging equipment is a high-power power electronic converter. Electric vehicles are connected to the grid for charging, which inevitably interacts with the grid, causing safety issues for DC charging equipment. The safety issues are mainly reflected in the following two aspects: (1) The impact of DC charging equipment on the safety of the grid; (2) The impact of the grid on the safe connection of DC charging equipment. The impact of DC charging equipment on the safety of the grid is mainly the constraints of DC charging equipment on the power quality and stability of the grid; the impact of the grid on the safe connection of DC charging equipment is mainly the power quality of the grid and the constraints of the grid capacity on the safe connection of DC charging equipment.

[0003] The existing publication number CN110556855B discloses a safety evaluation method and device for DC charging equipment accessing the power grid. The method first obtains the power grid operation parameters before and after the DC charging equipment is connected to the power grid, and then determines the safety of the DC charging equipment accessing the power grid according to the evaluation indicators in the pre-constructed safety evaluation index evaluation system; the safety evaluation index evaluation system includes a target layer, a criterion layer and an indicator layer, and the evaluation indicators in the indicator layer are determined by the power grid operation parameters. The present invention improves the utilization rate of the DC charging equipment and ensures that the DC charging equipment can be safely connected to the power grid. The present invention provides specific safety evaluation indicators for determining the impact of the DC charging equipment accessing the power grid from two aspects: the impact of the DC charging equipment on the power grid safety and the impact of the power grid on the DC charging equipment safety. It is comprehensive and provides a reference basis for the safe access of DC charging facilities to the power grid. The principle is concise, the method is simple, and it has good operability and practicality.

[0004] The existing technology cannot perform all-round monitoring of DC charging equipment, which will affect the security of the power grid when it is connected to the power grid. To this end, we propose a safety evaluation method and device for DC charging equipment connected to the power grid. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for evaluating the safety of a DC charging device connected to a power grid, so as to solve the problems in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for evaluating the safety of a DC charging device connected to a power grid, comprising the following steps:

[0007] S1. Preliminary assessment: preliminary assessment of the technical specifications and design features of the charging equipment;

[0008] S2. Demand analysis: determine the security elements that need to be monitored and the types of monitoring modules;

[0009] S3. Distribution and debugging of monitoring modules: distribute each monitoring module reasonably; monitor regularly, record data and analyze;

[0010] S4. Comprehensive evaluation: Based on the data monitored by each module, conduct a comprehensive evaluation and produce an evaluation report.

[0011] Preferably, the monitoring module includes an insulation monitoring module, a grounding system monitoring module, an electromagnetic compatibility monitoring module, a power factor monitoring module, a communication interface monitoring module, a charging control monitoring module, a safety standard compliance monitoring module and an emergency measures monitoring module.

[0012] Preferably, the insulation monitoring module monitors the insulation performance of the charging equipment through an insulation resistance tester and a leakage protector;

[0013] The grounding system monitoring module uses a grounding resistance tester and a grounding continuity tester to detect whether the continuity of the grounding system and the grounding resistance meet the standards;

[0014] The electromagnetic compatibility monitoring module uses an electromagnetic field strength tester and a harmonic analyzer to evaluate the electromagnetic radiation and conducted interference generated by the charging equipment during operation;

[0015] The power factor monitoring module measures the power factor of the charging equipment through a power factor meter and a multi-function power quality analyzer to ensure that its impact on the power grid is minimized;

[0016] The communication interface monitoring module ensures that the communication protocol between the charging equipment and the power grid management system complies with the standards through network protocol analyzers and data packet capture tools;

[0017] The charging control monitoring module monitors the power regulation during the charging process through the intelligent charging management system and remote monitoring platform to ensure the correct implementation of the intelligent charging strategy;

[0018] The safety standards compliance monitoring module ensures that charging equipment complies with relevant international and national standards through standard compliance testing tools;

[0019] The emergency measures monitoring module monitors the effectiveness of the emergency power-off function and the reliability of the fire alarm system through the emergency power-off test device and the fire alarm system test tool.

[0020] Preferably, the monitoring module further comprises a user safety monitoring module, and the user safety monitoring module ensures the safety of the user-contacted part of the charging plug through an anti-electric shock testing tool.

[0021] A safety evaluation device for connecting a DC charging device to a power grid, comprising:

[0022] Insulation monitoring module: monitors the insulation performance of charging equipment through insulation resistance tester and leakage protector;

[0023] Grounding system monitoring module: Use grounding resistance tester and grounding continuity tester to detect whether the continuity and grounding resistance of the grounding system meet the standards;

[0024] Electromagnetic compatibility monitoring module: Evaluate the electromagnetic radiation and conducted interference generated by the charging equipment during operation through the electromagnetic field strength tester and harmonic analyzer;

[0025] Power factor monitoring module: Measure the power factor of the charging equipment through the power factor meter and multi-function power quality analyzer to ensure that its impact on the power grid is minimized;

[0026] Communication interface monitoring module: Ensure that the communication protocol between the charging equipment and the grid management system complies with the standards through network protocol analyzers and packet capture tools;

[0027] Charging control monitoring module: monitors the power regulation during the charging process through the intelligent charging management system and remote monitoring platform to ensure the correct implementation of the intelligent charging strategy;

[0028] Safety standards compliance monitoring module: Ensure that charging equipment complies with relevant international and national standards through standard compliance testing tools;

[0029] Emergency measures monitoring module: monitors the effectiveness of the emergency power-off function and the reliability of the fire alarm system through the emergency power-off test device and the fire alarm system test tool;

[0030] User safety monitoring module: Ensure the safety of the user-contacted part of the charging plug through an anti-electric shock test tool.

[0031] Compared with the prior art, the present invention has the following beneficial effects: the insulation monitoring module monitors the insulation performance of the charging equipment through an insulation resistance tester and a leakage protector; the grounding system monitoring module detects whether the continuity of the grounding system and the grounding resistance meet the standards through a grounding resistance tester and a grounding continuity tester; the electromagnetic compatibility monitoring module evaluates the electromagnetic radiation and conducted interference generated by the charging equipment when it is working through an electromagnetic field strength tester and a harmonic analyzer; the power factor monitoring module measures the power factor of the charging equipment through a power factor meter and a multi-function power quality analyzer to ensure that its impact on the power grid is minimized; the communication interface monitoring module ensures that the communication protocol between the charging equipment and the power grid management system meets the standards through a network protocol analyzer and a data packet capture tool; the charging control monitoring module monitors the power regulation during the charging process through an intelligent charging management system and a remote monitoring platform to ensure the correct implementation of the intelligent charging strategy; the safety standard compliance monitoring module ensures that the charging equipment complies with relevant international and national standards through a standard compliance testing tool; the emergency measures monitoring module monitors the effectiveness of the emergency power-off function and the reliability of the fire alarm system through an emergency power-off test device and a fire alarm system test tool; the present application can realize all-round monitoring of DC charging equipment to ensure the safety of its access to the power grid; and accurate safety evaluation can be achieved through all-round monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0035] See also Figure 1 In an embodiment of the present invention, a method for evaluating the safety of a DC charging device connected to a power grid includes the following steps:

[0036] S1. Preliminary assessment: preliminary assessment of the technical specifications and design features of the charging equipment;

[0037] S2. Demand analysis: determine the security elements that need to be monitored and the types of monitoring modules;

[0038] S3. Distribution and debugging of monitoring modules: distribute each monitoring module reasonably; monitor regularly, record data and analyze;

[0039] S4. Comprehensive evaluation: Based on the data monitored by each module, conduct a comprehensive evaluation and produce an evaluation report.

[0040] Preferably, the monitoring module includes an insulation monitoring module, a grounding system monitoring module, an electromagnetic compatibility monitoring module, a power factor monitoring module, a communication interface monitoring module, a charging control monitoring module, a safety standard compliance monitoring module and an emergency measures monitoring module.

[0041] Preferably, the insulation monitoring module monitors the insulation performance of the charging equipment through an insulation resistance tester and a leakage protector;

[0042] The grounding system monitoring module uses a grounding resistance tester and a grounding continuity tester to detect whether the continuity of the grounding system and the grounding resistance meet the standards;

[0043] The electromagnetic compatibility monitoring module uses an electromagnetic field strength tester and a harmonic analyzer to evaluate the electromagnetic radiation and conducted interference generated by the charging equipment during operation;

[0044] The power factor monitoring module measures the power factor of the charging equipment through a power factor meter and a multi-function power quality analyzer to ensure that its impact on the power grid is minimized;

[0045] The communication interface monitoring module ensures that the communication protocol between the charging equipment and the power grid management system complies with the standards through network protocol analyzers and data packet capture tools;

[0046] The charging control monitoring module monitors the power regulation during the charging process through the intelligent charging management system and remote monitoring platform to ensure the correct implementation of the intelligent charging strategy;

[0047] The safety standards compliance monitoring module ensures that charging equipment complies with relevant international and national standards through standard compliance testing tools;

[0048] The emergency measures monitoring module monitors the effectiveness of the emergency power-off function and the reliability of the fire alarm system through the emergency power-off test device and the fire alarm system test tool.

[0049] Preferably, the monitoring module further comprises a user safety monitoring module, and the user safety monitoring module ensures the safety of the user-contacted part of the charging plug through an anti-electric shock testing tool.

[0050] Electrical safety: Ensure that the insulation performance inside and outside the charging equipment meets relevant standards to prevent leakage; set up an overload protection device to prevent the current from exceeding the rated value of the equipment and causing damage; configure a short-circuit protection device to quickly cut off the power supply in the event of a short circuit.

[0051] Grounding system: Ensure that the grounding resistance of the charging equipment meets the standard, generally less than 4 ohms. Test the continuity of the grounding loop to ensure that the current can be quickly discharged in the event of a fault.

[0052] Electromagnetic compatibility: Evaluate whether the electromagnetic radiation generated by the charging equipment during operation will interfere with surrounding electronic equipment. Check whether the charging equipment will have adverse effects on the power grid.

[0053] Power factor correction: Optimize the power factor of the charging equipment and reduce the reactive power loss of the power grid.

[0054] Communication protocol: Ensure that the charging equipment supports the communication protocol with the power grid management system; protect the security of communication data to prevent data from being illegally accessed or tampered with.

[0055] A safety evaluation device for connecting a DC charging device to a power grid, comprising:

[0056] Insulation monitoring module: monitors the insulation performance of charging equipment through insulation resistance tester and leakage protector;

[0057] Grounding system monitoring module: Use grounding resistance tester and grounding continuity tester to detect whether the continuity and grounding resistance of the grounding system meet the standards;

[0058] Electromagnetic compatibility monitoring module: Evaluate the electromagnetic radiation and conducted interference generated by the charging equipment during operation through the electromagnetic field strength tester and harmonic analyzer;

[0059] Power factor monitoring module: Measure the power factor of the charging equipment through the power factor meter and multi-function power quality analyzer to ensure that its impact on the power grid is minimized;

[0060] Communication interface monitoring module: Ensure that the communication protocol between the charging equipment and the grid management system complies with the standards through network protocol analyzers and packet capture tools;

[0061] Charging control monitoring module: monitors the power regulation during the charging process through the intelligent charging management system and remote monitoring platform to ensure the correct implementation of the intelligent charging strategy;

[0062] Safety standards compliance monitoring module: Ensure that charging equipment complies with relevant international and national standards through standard compliance testing tools;

[0063] Emergency measures monitoring module: monitors the effectiveness of the emergency power-off function and the reliability of the fire alarm system through the emergency power-off test device and the fire alarm system test tool;

[0064] User safety monitoring module: Ensure the safety of the user-contacted part of the charging plug through an anti-electric shock test tool.

[0065] Working principle: Preliminary evaluation of the technical specifications and design features of the charging equipment; determine the safety factors that need to be monitored and the types of monitoring modules; reasonably distribute the various monitoring modules; conduct regular monitoring, record data and analyze; conduct comprehensive evaluation and produce evaluation reports based on the data monitored by each module;

[0066] The insulation monitoring module monitors the insulation performance of the charging equipment through an insulation resistance tester and a leakage protector;

[0067] The grounding system monitoring module uses a grounding resistance tester and a grounding continuity tester to detect whether the continuity of the grounding system and the grounding resistance meet the standards;

[0068] The electromagnetic compatibility monitoring module uses an electromagnetic field strength tester and a harmonic analyzer to evaluate the electromagnetic radiation and conducted interference generated by the charging equipment during operation;

[0069] The power factor monitoring module measures the power factor of the charging equipment through a power factor meter and a multi-function power quality analyzer to ensure that its impact on the power grid is minimized;

[0070] The communication interface monitoring module ensures that the communication protocol between the charging equipment and the power grid management system complies with the standards through network protocol analyzers and data packet capture tools;

[0071] The charging control monitoring module monitors the power regulation during the charging process through the intelligent charging management system and remote monitoring platform to ensure the correct implementation of the intelligent charging strategy;

[0072] The safety standards compliance monitoring module ensures that charging equipment complies with relevant international and national standards through standard compliance testing tools;

[0073] The emergency measures monitoring module monitors the effectiveness of the emergency power-off function and the reliability of the fire alarm system through the emergency power-off test device and the fire alarm system test tool.

[0074] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safety evaluation method for connecting a DC charging device to a power grid, characterized in that: The following steps are involved: S1. Preliminary assessment: preliminary assessment of the technical specifications and design features of the charging equipment; S2. Demand analysis: determine the security elements that need to be monitored and the types of monitoring modules; S3. Distribution and debugging of monitoring modules: distribute each monitoring module reasonably; monitor regularly, record data and analyze; S4. Comprehensive evaluation: Based on the data monitored by each module, conduct a comprehensive evaluation and produce an evaluation report.

2. A safety evaluation method for connecting a DC charging device to a power grid according to claim 1, characterized in that: The monitoring modules include an insulation monitoring module, a grounding system monitoring module, an electromagnetic compatibility monitoring module, a power factor monitoring module, a communication interface monitoring module, a charging control monitoring module, a safety standard compliance monitoring module and an emergency measures monitoring module.

3. A safety evaluation method for connecting a DC charging device to a power grid according to claim 2, characterized in that: The insulation monitoring module monitors the insulation performance of the charging equipment through an insulation resistance tester and a leakage protector; The grounding system monitoring module uses a grounding resistance tester and a grounding continuity tester to detect whether the continuity of the grounding system and the grounding resistance meet the standards; The electromagnetic compatibility monitoring module uses an electromagnetic field strength tester and a harmonic analyzer to evaluate the electromagnetic radiation and conducted interference generated by the charging equipment during operation; The power factor monitoring module measures the power factor of the charging equipment through a power factor meter and a multi-function power quality analyzer to ensure that its impact on the power grid is minimized; The communication interface monitoring module ensures that the communication protocol between the charging equipment and the power grid management system complies with the standards through network protocol analyzers and data packet capture tools; The charging control monitoring module monitors the power regulation during the charging process through the intelligent charging management system and remote monitoring platform to ensure the correct implementation of the intelligent charging strategy; The safety standards compliance monitoring module ensures that charging equipment complies with relevant international and national standards through standard compliance testing tools; The emergency measures monitoring module monitors the effectiveness of the emergency power-off function and the reliability of the fire alarm system through the emergency power-off test device and the fire alarm system test tool.

4. A safety evaluation method for connecting a DC charging device to a power grid according to claim 1, characterized in that: The monitoring module also includes a user safety monitoring module, which ensures the safety of the user-contacted part of the charging plug through an anti-electric shock testing tool.

5. A safety evaluation device for connecting a DC charging device to a power grid according to claim 1, characterized in that: include: Insulation monitoring module: monitors the insulation performance of charging equipment through insulation resistance tester and leakage protector; Grounding system monitoring module: Use grounding resistance tester and grounding continuity tester to detect whether the continuity and grounding resistance of the grounding system meet the standards; Electromagnetic compatibility monitoring module: Evaluate the electromagnetic radiation and conducted interference generated by the charging equipment during operation through the electromagnetic field strength tester and harmonic analyzer; Power factor monitoring module: Measure the power factor of the charging equipment through the power factor meter and multi-function power quality analyzer to ensure that its impact on the power grid is minimized; Communication interface monitoring module: Ensure that the communication protocol between the charging equipment and the grid management system complies with the standards through network protocol analyzers and packet capture tools; Charging control monitoring module: monitors the power regulation during the charging process through the intelligent charging management system and remote monitoring platform to ensure the correct implementation of the intelligent charging strategy; Safety standards compliance monitoring module: Ensure that charging equipment complies with relevant international and national standards through standard compliance testing tools; Emergency measures monitoring module: monitors the effectiveness of the emergency power-off function and the reliability of the fire alarm system through the emergency power-off test device and the fire alarm system test tool; User safety monitoring module: Ensure the safety of the user-contacted part of the charging plug through an anti-electric shock test tool.

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