Safety risk assessment method and system for photovoltaic-charging pile-variable frequency load system

Abstract

The invention discloses a safety risk assessment method and system for a photovoltaic-charging pile-frequency conversion load system, and the method comprises the steps: determining the safety risk type and risk initiation factors of the photovoltaic-charging pile-frequency conversion load system, and also comprises the steps: determining safety standards and specifications, determining the subsequent detection and maintenance of the equipment according to the safety standards and specifications, and carrying out the maintenance of the equipment. And circuit lightning protection and grounding protection are adopted. According to the safety risk assessment method and system for the photovoltaic-charging pile-variable frequency load system, common safety risk types and risk initiation factors of the photovoltaic-charging pile-variable frequency load system are determined and understood, so that before the safety risk occurs, a part of risk generation factors can be avoided, and compared with a traditional technology, the safety risk assessment method and system for the photovoltaic-charging pile-variable frequency load system have the advantage that the safety risk assessment efficiency is improved. The photovoltaic-charging pile-variable frequency load system has the advantages that the generation probability of the safety risk of the photovoltaic-charging pile-variable frequency load system is reduced, and meanwhile, the service life of the photovoltaic-charging pile-variable frequency load system is effectively prolonged through the safety risk assessment of the photovoltaic-charging pile-variable frequency load system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic-charging pile-variable frequency load system, in particular to a safety risk assessment method and system for photovoltaic-charging pile-variable frequency load system. BACKGROUND

[0002] The photovoltaic-charging pile-variable frequency load system is a new energy system that uses light energy to generate electricity, stores the electricity in the battery through the charging pile, and supplies the electricity to the electric vehicles and other loads through the variable frequency load system. With the increasing proportion of customer-side photovoltaic, electric vehicle charging pile, and variable frequency load access, related customer-side safety hazards occur frequently. The problems such as aging of photovoltaic grid-connected inverter components, cable rupture, and loose contacts are prone to cause fault arcs and trigger serious fire accidents. The problems such as overhigh temperature of charging circuit of the charging pile and short circuit of the external DC system of the battery lead to frequent spontaneous combustion accidents during the charging process of the electric vehicle. The power quality problems such as voltage fluctuation and current out-of-limit will cause abnormal off-grid of the load equipment, affect the normal life needs and economic production behavior of the customers, and cause frequent safety hazard accidents, which seriously affect the power supply reliability of the power grid and threaten the personal safety of the power customers, causing huge losses to the power customers and the power grid. This system uses renewable energy, but also has some safety risks. In order to ensure the normal use of the system in the future, it needs to be evaluated and controlled. Therefore, it is very important to design a safety risk assessment method and system for a new photovoltaic-charging pile-variable frequency load system, such as:

[0003] A photovoltaic DC charging pile system disclosed in Chinese patent authorization publication No. CN106627202B includes a charging pile, a display setting unit, and a charging output plug. The charging pile is provided with a DC voltage transformation controlled circuit, a DC bus, an MPPT controller, a power grid switch circuit, a grid-connected switch circuit, a voltage and current acquisition circuit, a CAN communication circuit, a main control unit, and a routing unit. The input end of the DC voltage transformation controlled circuit is connected to the DC bus, and the output end is connected to the charging output plug. The DC bus is connected to the solar cell panel through the MPPT controller, and is connected to the power grid through the power grid switch circuit and the grid-connected switch circuit, respectively. The voltage and current acquisition circuit is connected to the charging output plug and the automobile charging input plug, respectively.

[0004] The patent authorization publication number CN116278885B of China is a kind of parallel off-grid photovoltaic energy storage charging pile system and its control method, belong to parallel off-grid power generation technical field, including photovoltaic power generation module;Energy storage module;Control adjustment module, for unified control adjustment entire parallel off-grid photovoltaic energy storage charging pile system, the generated electric energy is reasonably controlled and adjusted to charging pile use;Public power grid module, for transporting and distributing electric energy, change voltage, and input electric energy into charging pile;Charging pile module, for making charging pile normal use. To solve the problems that the existing photovoltaic energy storage system cannot realize the functions of photovoltaic self-generation charging pile charging and surplus electricity storage, and cannot effectively buffer the load impact of power grid, the parallel off-grid photovoltaic energy storage charging pile system and its control method can fully guarantee that the charging pile is fully charged, can realize the functions of photovoltaic self-generation charging pile charging and surplus electricity storage, can effectively buffer the load impact of power grid, and improve the use experience of charging pile.

[0005] However, the prior art has the following defects: it is inconvenient to avoid some risk factors before the safety risk occurs, it is difficult to reduce the probability of safety risk of photovoltaic-charging pile-variable frequency load system, it is difficult to improve the protection of personnel safety and the safety of electrical equipment, and it is difficult to improve the service life of photovoltaic-charging pile-variable frequency load system, and it is difficult to avoid the risk caused by external control failure, therefore, the present application provides a safety risk assessment method and system for photovoltaic-charging pile-variable frequency load system to solve the problems mentioned above. SUMMARY

[0006] The present application aims to provide a safety risk assessment method and system for photovoltaic-charging pile-variable frequency load system to solve the problems mentioned in the background art, such as inconvenience in avoiding some risk factors before the safety risk occurs, difficulty in reducing the probability of safety risk of photovoltaic-charging pile-variable frequency load system, difficulty in improving the protection of personnel safety and the safety of electrical equipment, and difficulty in improving the service life of photovoltaic-charging pile-variable frequency load system, and difficulty in avoiding the risk caused by external control failure.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a safety risk assessment method and system for photovoltaic-charging pile-variable frequency load system, including determining the safety risk types and risk causing factors of photovoltaic-charging pile-variable frequency load system, and further including determining safety standards and specifications, and subsequently detecting and maintaining the equipment after determining the safety standards and specifications, and installing electrical safety protection parts after detecting and maintaining the equipment;

[0008] The circuit lightning protection and grounding protection is taken, and after the electrical safety protection parts are installed and the circuit lightning protection and grounding protection is completed, the monitoring and warning device needs to be installed, and after the monitoring and warning device is installed, the system failure emergency plan needs to be made and regular maintenance is needed.

[0009] Preferably, the safety risk categories of the photovoltaic-charging pile-variable frequency load system include electrical safety risks and fire safety risks.

[0010] Preferably, the electrical safety risks come from electrical components in the system, mainly photovoltaic panels, charging piles, and inverters.

[0011] Preferably, the electrical safety risk triggers are mainly excessive voltage, excessive current, short circuit, and poor wiring.

[0012] Preferably, the fire safety risks come from electronic components and line faults in the system, and the fire safety risk triggers are mainly wire aging and electrical equipment overload.

[0013] Preferably, the safety standards and specifications are developed based on national standards, industry standards, and technical standards, and the development of safety standards and specifications is conducive to the design, construction, and maintenance of the system to meet relevant requirements.

[0014] Preferably, the installation of electrical safety protection devices mainly adds short circuit protectors and leakage protectors, and the main function of the installation of electrical safety protection devices is to discover and isolate electrical faults to prevent electric shock and fire.

[0015] Preferably, the main purpose of installing system monitoring equipment and warning devices is to monitor the power generation of photovoltaic power, the power supply of charging piles, and the power consumption of variable frequency loads in real time.

[0016] Preferably, the safety risk assessment method includes the following steps:

[0017] Step 1: Determine the safety risk categories and risk triggers of the photovoltaic-charging pile-variable frequency load system;

[0018] Step 2: Determine the safety standards and specifications;

[0019] Step 3: Detect and maintain the equipment;

[0020] Step 4: Install electrical safety protection parts;

[0021] Step 5: Take circuit lightning protection and grounding protection;

[0022] Step 6: Install monitoring and warning devices;

[0023] Step 7: Develop a system failure emergency plan;

[0024] Step eight: regular maintenance.

[0025] Compared with the prior art, the photovoltaic-charging pile-variable frequency load system safety risk assessment method and system of the application determines and understands the common safety risk types and risk causing factors of the photovoltaic-charging pile-variable frequency load system, so that some risk causing factors can be avoided before the safety risk occurs, which helps the system operator to timely formulate a scheme to respond to the risk when the risk occurs, improves the safety practical performance of the photovoltaic-charging pile-variable frequency load system, reduces the probability of safety risk of the photovoltaic-charging pile-variable frequency load system, and effectively improves the service life of the photovoltaic-charging pile-variable frequency load system through safety risk assessment of the photovoltaic-charging pile-variable frequency load system.

[0026] 1. By determining and understanding the common safety risk types and risk causing factors of the photovoltaic-charging pile-variable frequency load system before safety risk assessment of the photovoltaic-charging pile-variable frequency load system, some risk causing factors can be avoided before the safety risk occurs, the probability of safety risk of the photovoltaic-charging pile-variable frequency load system is reduced, the protection of personnel safety and the safety protection of electrical equipment are improved, the safety risks of the photovoltaic-charging pile-variable frequency load system are classified, which helps the system operator to timely formulate a scheme to respond to the risk when the risk occurs, and improves the safety practical performance of the photovoltaic-charging pile-variable frequency load system.

[0027] 2. By formulating safety standards and specifications for use when assessing the safety risk of the photovoltaic-charging pile-variable frequency load system, the design, construction, operation and maintenance of the system meet the relevant requirements, unqualified photovoltaic-charging pile-variable frequency load systems are avoided from flowing into the market, the standard range of qualified products is improved before production, and the photovoltaic-charging pile-variable frequency load system can meet the safety standards.

[0028] Further, by regularly detecting and maintaining the photovoltaic panels, charging piles, inverters and other equipment, the normal operation and safety performance are ensured, by installing system monitoring equipment and alarm devices, by installing electrical safety protection parts in the circuit, electrical faults are found in time, the occurrence of electric shock and fire is prevented, lightning protection and grounding protection measures are increased, the risk of lightning and induction is reduced, the safe operation of the system is ensured, the influence of natural disasters on the photovoltaic-charging pile-variable frequency load system is reduced, system monitoring equipment and alarm devices are installed, the power generation of photovoltaic power, the power supply of charging piles and the power consumption of variable frequency load are compared and monitored in time, and abnormal conditions are found and handled in time. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the safety risk assessment method flow chart of the photovoltaic-charging pile-variable frequency load system of the application;

[0030] Figure 2 It is the safety risk type composition diagram of the photovoltaic-charging pile-variable frequency load system of the application;

[0031] Figure 3 It is the safety standard and specification development basis source diagram of the application;

[0032] Figure 4 It is the installation electrical safety protection purpose diagram of the application;

[0033] Figure 5 It is the installation system monitoring equipment and alarm device purpose diagram of the application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0035] Please refer to Figures 1-5 The application provides a technical solution: a safety risk assessment method and system for a photovoltaic-charging pile-variable frequency load system, which comprises determining the safety risk types and risk causing factors of the photovoltaic-charging pile-variable frequency load system, and further comprises determining safety standards and specifications, determining that the equipment needs to be detected and maintained after the safety standards and specifications, and installing electrical safety protection parts after the detection and maintenance of the equipment. The protection is installed in the circuit used in the photovoltaic-charging pile-variable frequency load system to avoid the occurrence of voltage and current abnormalities in the circuit, thereby protecting the photovoltaic-charging pile-variable frequency load system from the root.

[0036] After the installation of the electrical safety protection parts and the completion of the circuit lightning protection and grounding protection, the monitoring and warning devices need to be installed, and after the installation of the monitoring and warning devices, the system failure emergency plan needs to be developed and regular maintenance and repair need to be performed.

[0037] The safety risk assessment method comprises the following steps:

[0038] Firstly, the types of safety risks and risk factors of the photovoltaic-charging pile-variable frequency load system are determined, and the sources of each safety risk are understood; then the safety standards and specifications are determined, so that the photovoltaic-charging pile-variable frequency load system is formulated to meet the safety standards; then the equipment is detected and maintained to ensure its normal operation and safety performance; at the same time, electrical safety protection parts are installed and circuit lightning protection and grounding protection circuits are adopted to ensure the normal work of the system; monitoring and warning devices are installed to monitor the internal operation state of the system in real time; then the emergency plan for system failure is formulated to avoid the occurrence of unexpected situations; finally, regular maintenance is carried out to ensure the safe use of the system and reduce the occurrence of risks.

[0039] As shown in Figure 2 , the types of safety risks of the photovoltaic-charging pile-variable frequency load system include electrical safety risks and fire safety risks, the electrical safety risks come from the electrical components in the system, mainly photovoltaic panels, charging piles and inverters, and the main factors of electrical safety risks are excessive voltage and current, short circuit and poor wiring, etc., the fire safety risks come from the electronic components and circuit faults in the system, and the main factors of fire safety risks are aging of electrical wires and overload of electrical equipment, etc., before the safety risk assessment of the photovoltaic-charging pile-variable frequency load system, the common types of safety risks and risk factors of the photovoltaic-charging pile-variable frequency load system are determined and understood, so that some risk factors can be avoided before the occurrence of safety risks, the probability of safety risks of the photovoltaic-charging pile-variable frequency load system is reduced, the protection of personnel safety and the safety of electrical equipment are improved, the classification of safety risks of the photovoltaic-charging pile-variable frequency load system helps the system operators to formulate solutions to deal with risks in time when risks occur, and improves the safety and practical performance of the photovoltaic-charging pile-variable frequency load system.

[0040] As shown in Figure 3 , Figure 4 and Figure 5 , the safety standards and specifications are formulated based on national standards, industry standards and technical standards, and the formulation of safety standards and specifications is conducive to the design, construction and maintenance of the system to meet the relevant requirements, the installation of electrical safety protection devices mainly through the installation of short circuit protector and leakage protector, and the main function of the installation of electrical safety protection devices is to find and isolate electrical faults to prevent electric shock and fire, by installing protection in the circuit used in the photovoltaic-charging pile-variable frequency load system, the risk caused by abnormal voltage and current in the circuit is avoided, the photovoltaic-charging pile-variable frequency load system is protected from the root cause, and the main purpose of installing system monitoring equipment and alarm devices is to monitor the power generation of photovoltaic power, the power supply of charging pile and the power consumption of variable frequency load in real time;

[0041] In the assessment of photovoltaic-charging pile-variable frequency load system safety risk, first of all, the safety standards and specifications used are formulated, so that the design, construction, operation and maintenance of the system meet the relevant requirements, avoid unqualified photovoltaic-charging pile-variable frequency load systems from flowing into the market, improve the standard range of qualified products before production, regularly detect and maintain photovoltaic panels, charging piles, inverters and other equipment to ensure their normal operation and safety performance, install electrical safety protection parts such as short circuit protector and leakage protector in the circuit, timely detect and isolate electrical faults, prevent electric shock and fire, at the same time, increase the lightning protection and grounding protection measures of the system, reduce the risk of lightning and induction, reduce the impact of natural disasters on photovoltaic-charging pile-variable frequency load system, and ensure the safe operation of the system;

[0042] By installing system monitoring equipment and alarm devices, the power generation of photovoltaic power, the power supply of charging piles and the power consumption of variable frequency load are compared and monitored in time, and abnormal conditions are found and handled in time, so that the system operator can control the operation state of the photovoltaic-charging pile-variable frequency load system from data comparison, and ensure that the internal energy of the photovoltaic-charging pile-variable frequency load system is fully converted when it is running, so that the converted renewable resources can be fully utilized, and the conversion rate of the photovoltaic-charging pile-variable frequency load system to renewable resources is improved.

[0043] After the safety risk assessment of the equipment, in order to ensure the normal follow-up of the equipment, a system failure emergency plan needs to be developed to reduce the sudden occurrence of safety risks, at the same time, the system operator needs to be trained to improve safety awareness and operation skills, regular safety propaganda and education activities are carried out to enhance the safety responsibility and risk awareness of all personnel, the system operator's proficiency in the operation mode of the photovoltaic-charging pile-variable frequency load system and the full understanding of various indicators are improved, the service life of the photovoltaic-charging pile-variable frequency load system is effectively improved, and the risk caused by external control failure is avoided, which is the safety risk assessment method and use method of the photovoltaic-charging pile-variable frequency load system.

[0044] The standard parts used in the application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings, and the specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art, the mechanical parts and equipment adopt the conventional type in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here, and the contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0045] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A safety risk assessment system for a photovoltaic-charging pile-inverter load system, comprising determining the types of safety risks and risk-inducing factors of the photovoltaic-charging pile-inverter load system, characterized in that: This also includes determining safety standards and specifications, followed by equipment testing and maintenance, and the installation of electrical safety protection components after equipment testing and maintenance. The operation of circuit lightning protection and grounding protection should be carried out after the installation of electrical safety protection components. After the circuit lightning protection and grounding protection are completed, monitoring and alarm devices should be installed. After the installation of monitoring and alarm devices is completed, emergency plans for system failures should be formulated and regular inspections and maintenance should be carried out.

2. The safety risk assessment system for a photovoltaic-charging pile-frequency conversion load system according to claim 1, characterized in that: The safety risks of the photovoltaic-charging pile-frequency conversion load system include electrical safety risks and fire safety risks.

3. The safety risk assessment system for a photovoltaic-charging pile-frequency conversion load system according to claim 2, characterized in that: The electrical safety risks originate from electrical components in the system, primarily photovoltaic panels, charging piles, and inverters.

4. The safety risk assessment system for a photovoltaic-charging pile-frequency conversion load system according to claim 2, characterized in that: The main factors causing electrical safety risks are excessive voltage and current, short circuits, and poor wiring.

5. The safety risk assessment system for a photovoltaic-charging pile-frequency conversion load system according to claim 2, characterized in that: The fire safety risks originate from electronic component and circuit failures in the system, and the main contributing factors to these risks are aging wires and overloaded electrical equipment.

6. The safety risk assessment system for a photovoltaic-charging pile-frequency conversion load system according to claim 1, characterized in that: The safety standards and specifications are based on national standards, industry standards, and technical standards, and the formulation of safety standards and specifications is conducive to ensuring that the system design, construction, and maintenance meet relevant requirements.

7. The safety risk assessment system for a photovoltaic-charging pile-frequency conversion load system according to claim 1, characterized in that: The installation of electrical safety protection devices mainly involves adding short-circuit protectors and leakage current protectors. The main function of these devices is to detect and isolate electrical faults, and to prevent electric shock and fire.

8. The safety risk assessment system for a photovoltaic-charging pile-frequency conversion load system according to claim 1, characterized in that: The main purpose of the installation system monitoring equipment and alarm device is to monitor the photovoltaic power generation, the power supply of the charging pile, and the power consumption of the frequency conversion load in real time.

9. The safety risk assessment method for a photovoltaic-charging pile-frequency conversion load system according to claim 1, wherein the safety risk assessment method includes the following steps: Step 1: Determine the types of safety risks and risk-inducing factors of the photovoltaic-charging pile-inverter load system; Step Two: Determine safety standards and regulations; Step 3: Inspect and maintain the equipment; Step 4: Install electrical safety protection components; Step 5: Implement circuit lightning protection and grounding protection; Step Six: Install monitoring and alarm devices; Step 7: Develop a system failure contingency plan; Step 8: Conduct regular inspections and maintenance.

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