85-87 BIPV system design requirements
Author: Source: Datetime: 2016-12-30 17:00:50
4.2.2 BIPV system design requirements
BIPV system design generally has the following provisions.
(1) Industrial and civil buildings Photovoltaic systems should be specially designed or part of the building electrical engineering design.
② The selection and design of PV modules or square arrays should be combined with the building, in the comprehensive consideration of power generation efficiency, power generation, electrical and structural safety, suitable for aesthetic premise, the rational use of building components and building materials type PV modules, Number of coordination, full
Foot installation, cleaning, maintenance and local replacement requirements.
③ PV system transmission and distribution and control cables should be arranged in co-ordination with other pipelines, safe, hidden, centralized layout, to meet
Installation and maintenance requirements.
④ PV modules or square array connecting cables and their output cables should be consistent with the "PV (PV) component safety appraisal of the first
Points: the structural requirements "GB / T 20047. 1 of the relevant provisions.
⑤ In the personnel may have access to or close to the location of photovoltaic systems, anti-electric shock warning signs should be set.
⑥ grid-connected PV system should have the corresponding network protection.
⑦ PV system should be installed metering device, and should be set aside detection interface.
⑧ PV system should meet the requirements of "GB / T 19939" for power quality indicators such as voltage deviation, flicker, frequency deviation, harmonics, three-phase unbalance and power factor.
⑨ off-grid independent photovoltaic system should meet the "domestic solar photovoltaic power system technical conditions and test methods" (GB / T 19064) of the relevant requirements.
① should be based on the use of new buildings or existing buildings function, power grid conditions, the nature of the load and system operation mode and other factors to determine the photovoltaic system for building materials, component type or installation type.
② PV systems are generally composed of photovoltaic arrays, PV junction boxes, inverters (limited to AC line systems), batteries and their charge control devices (limited to with energy storage system), energy meter and display of electrical energy related parameters instrumentation .
③ The performance of the components of the PV system should meet the relevant requirements of the national or industry standards, and should obtain the relevant certification.
④ PV square design should follow the following principles.
A. Determine the type, specification, installation location and installable site area of the PV module in accordance with the architectural design and its electrical load.
B. According to the best use of the best angle and easy to remove dust, to ensure good ventilation components to determine the principles of the safety of photovoltaic components Installed.
C. Determine the number of PV modules connected in series (or string of PV modules or strings) based on the rated DC voltage of the inverter, the maximum power tracking control range, the maximum output operating voltage of the PV module and its temperature coefficient.
D. Determine the number of parallel connections of PV modules based on the total installed capacity and the capacity of PV modules.
E. The same group of strings and the same sub-array, the electrical parameters of the components should be as consistent as possible, in which the maximum output power Pm, the maximum operating current Im dispersion should be less than ± 3%.
F. Building materials type photovoltaic system and component type in the design of the building system, you need to take into account the overall arrangement of electrical wiring, and to ensure that each piece of building materials, photovoltaic modules and components of the metal frame of the reliable grounding. .
⑤ PV junction box settings should follow the following principles.
A• Busway busbars or terminals should be installed in the PV junction box.
B. Each PV module string should be led to the busbar by the cable, respectively, before the busbar set DC sub-switch, and set the DC main switch.
C • Lightning protection devices shall be provided in the PV junction box.
D • The location of the PV junction box should be convenient for operation and maintenance, should choose indoor dry place. The PV junction box installed outdoors shall be waterproof and anticorrosive, and the degree of protection shall be IP65 or above.
⑥ independent photovoltaic system inverter rated capacity of the total load side should be based on the maximum power and load load characteristics of choice.
⑦ The total rated capacity of grid-connected PV system inverter shall be determined according to the installed capacity of PV system. The number of grid-connected inverter shall be determined according to the installed capacity of PV system and the rated capacity of single grid-connected inverter. Grid-connected inverter selection should follow the following principles.
A • Grid-connected inverters should have automatic run and stop functions, maximum power tracking control function and anti-islanding function.
B • Grid-connected inverters without power frequency isolation transformers shall have DC detection capability.
C • Grid-connected inverters without isolation transformers shall have DC ground fault detection.
D. Equipped with the same voltage, phase, phase, harmonics, frequency and wiring mode as the power system.
E • Meet the requirements of high efficiency, energy saving and environmental protection.
⑧ DC line selection should follow the following principles.
A • The voltage rating should be 1.25 times higher than the voltage of the photovoltaic array.
B • The rated current capacity should be higher than the short-circuit protection appliance setting value, the short-circuit protection appliance setting value should be higher than 1.25 times of the nominal short-circuit current of the photovoltaic array.
C • Line voltage loss should be within 3% of full load.
⑨ PV system lightning protection and grounding protection should meet the following requirements.
A • Measures to prevent lightning and lightning electromagnetic pulse of photovoltaic system should strictly abide by the relevant provisions of "Design Code for Lightning Protection of Buildings" (GB 50057).
B • The lightning protection and earthing measures for PV system and grid-connected equipment shall comply with the relevant provisions of "Guideline for over-voltage protection of photovoltaic (PV) power generation systems" (SJ / T 11127).
® 10 building material type photovoltaic system should follow the following principles.
A) Building materials PV modules must have the inherent function of building materials, and have no effect on the original function of building materials.
B • Building materials PV modules must be structured in accordance with the Technical Regulations for the Integration of Photovoltaic and Building Applications (hereinafter referred to as "Procedures", Section 4.4).
⑩ Component-based photovoltaic systems should follow the following principles.
A • PV modules must have the functions inherent in the building components and have no effect on the original function.
B • Component-type PV systems are required to be isolated by blocking diodes or to use a single controller or inverter for each string of components, in order to preserve the uniformity of the solar radiation received by the component in order to preserve the inherent functionality of the building component itself.
C • The structure of a component-type PV system must comply with the requirements of Section 4. 4 of the Rules.
1. Grid-connected PV system shall not only conform to the "Rules", but also conform to the "Design Code for Substation of 10kV and Substation",
2. Pre-volt system should be based on PV power distribution between the square and the scale of the building form of centralized or decentralized arrangement.
3. PV system transformers should use dry-type transformers
① PV system and public power grid and the local power supply network should meet the relevant provisions and requirements.
② When the PV system is connected to the public power grid in low voltage mode, it shall comply with the relevant provisions of the Technical Requirements for Grid-Connected Photovoltaic System (GB / T 19939).
(3) For photovoltaic systems connected to the public grid in the medium voltage or high voltage mode (10kV and above), the relevant part of the power quality shall refer to the Technical Requirements for Grid Connection of Photovoltaic Systems (GB / T 19939) and shall meet the following requirements.
A. The PV system should be able to operate normally when the operating voltage of PV system is 90% ~ 110% of the rated voltage.
B. The PV system shall provide the power supply organization with the test reports on the operation characteristics of the PV system within 6 months after the grid-connection operation,
To show that the PV system complies with the relevant regulations of the access system.
④ PV system and public power grid should be installed between the isolation device, and should meet the following requirements.
Between the photovoltaic array and the inverter, the inverter and the public power grid should be installed between the isolation device.
B • PV systems should be provided with grid-connected low-voltage switch cabinets (cabinet) at the grid-connected sites. Special signs and warning characters and symbols such as "warning" and "dual power supply" shall be provided.
⑤ The requirements for the safety and protection of grid-connected PV system can refer to the Technical Requirements for Grid-Connected Photovoltaic System (GB / T 19939) and shall meet the following requirements.
A. Grid-connected PV system should have automatic detection function and cut off the protection function.
B. The PV system shall be installed and connected according to the system access conditions and the requirements of the power supply department, and shall comply with the relevant provisions of the "PV system power interface characteristics" (GB / T 20046) and the "relay protection and safety Automatic Device Technical Specification "(GB / T 14285) functional requirements.
When the power quality of the public grid exceeds the limit, the PV system shall automatically stop supplying power to the public grid, and the PV system shall not supply power to the grid for a period of time after the power quality of the public grid is restored. The time delay for the resumption of grid connection is determined by the power supply department according to the local conditions. 6:
⑥ The control and communication of grid-connected PV system should meet the following requirements
A. According to the requirements of the local power supply department, configure the corresponding automation terminal equipment and communication devices, collecting photovoltaic system devices and grid lines of telemetry, remote data, and real-time data transmission to the corresponding dispatching master station.
B. In the grid-connected PV system grid connection point, the power quality real-time on-line monitoring device shall be configured and all measurable power quality parameters (voltage, frequency, harmonics, power factor, etc.) shall be transmitted to the corresponding dispatching master station .
⑦ PV grid-connected system should be based on the local power supply point of the principle of measurement points set to determine the energy metering points, and should meet the following requirements.
A. The PV system is equipped with a special energy metering device at the energy metering point.
B. The energy metering device shall comply with the relevant provisions of Technical Regulation for Design of Electrical Measurement and Energy Metering Device (DL / T 5137) and Technical Regulation of Energy Metering Device (DL / T 448).
⑧ as an emergency power supply of photovoltaic systems should meet the following requirements.
A • The PV system should be disconnected from the public grid in case of emergency and the unspecified load on the PV system should be cut off.
B. Switchgear (box) in the emergency circuit should be set to the corresponding emergency signs and warning signs.
C. The automatic switch between the PV system and the grid should be selected from the non-recovery mode.
① electric energy storage system should choose long life, high charge and discharge efficiency, self-discharge and other properties of superior battery.
② The energy storage system shall comply with the relevant requirements of the Technical Regulation for Design of DC System for Power Engineering (DL / T 5044) and the Technical Conditions and Test Methods for Domestic Solar PV Power System (GB / T 19064).
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