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Application scenarios of photovoltaic grid-connected cabinets

Release time:

2025-05-22

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Abstract

As a core equipment for distributed and centralized photovoltaic power stations, PV grid-tied cabinets have wide and diverse application scenarios, capable of meeting power demands in various scales and environments. The following are the main application scenarios and characteristics of PV grid-tied cabinets, organized based on knowledge base information:

I. Commercial and Industrial Rooftop PV Grid Connection

PV Grid-tied Cabinet Scenario Requirements:
Rooftop spaces of commercial and industrial buildings such as industrial parks, logistics centers, and large factories have high utilization rates, requiring efficient energy management to achieve self-consumption and surplus power fed into the grid.
Grid-tied Cabinet Functions ：

Large Capacity Access : Supports system expansion from 100kW to 1MW (e.g., a 1.2MW distributed power station at a certain automobile factory uses a dual-circuit grid-tied cabinet).
Smart Monitoring : Integrated 5G communication module, real-time uploading of power generation data to the cloud platform, automatic alarming for abnormal conditions.
Anti-reverse Current Control : Prevents power backflow from causing grid fluctuations through linkage between bi-directional metering electricity meters and PLC combinations with the power grid system.
Case Study : After a certain industrial park adopted customized grid-tied cabinets, the system conversion efficiency increased to 98.5%, saving over 1.2 million yuan in electricity bills annually.

II. Agri-photovoltaic and Fishery-photovoltaic Projects

PV Grid-tied Cabinet Scenario Requirements ：
Agricultural greenhouses and fishery-photovoltaic projects need to adapt to harsh environments such as high humidity, dust, and salt spray, while also addressing shading issues.
Grid-tied Cabinet Functions ：

High Protection Rating : IP65 waterproof and dustproof design, salt spray test reaches 720 hours (e.g., BWG series).
Dual MPPT Input : Compatible with modules of different tilt angles, effectively solving shading issues.
Dynamic Voltage Regulation : Maintains grid-connected operation even when grid voltage drops by 30% (e.g., a village-level power station in Shandong configured with DVR).
Case Study : After a certain 200MW agri-photovoltaic project adopted modular grid-tied cabinets, the fault rate decreased by 40%, and operation and maintenance costs saved 35%.

III. Safe Grid Connection for Household PV Systems

PV Grid-tied Cabinet Scenario Requirements ：
Household users need to ensure electricity safety while achieving power generation data monitoring and remote management.
Grid-tied Cabinet Functions ：

Compact Design : Adapts to villa and flat roof spaces (e.g., a household project in Jiangsu, dimensions 800×600×220mm).
Integrated Three Major Protections : Leakage protection, lightning protection, remote monitoring, users can view power generation data in real-time via mobile APP.
Zero Damage Record : A certain household project has been running for 3 years, cumulatively blocking 6 abnormal current surges.

IV. Off-grid Power Supply in Remote Areas

PV Grid-tied Cabinet Scenario Requirements ：
Areas without grid coverage (e.g., islands, remote mountainous areas) need to achieve intelligent switching between PV power generation and diesel generator/energy storage systems.
Grid-tied Cabinet Functions ：

Energy Storage Management : Equipped with Battery Management System (BMS) to achieve intelligent switching between PV power generation and diesel generators.
Dual-mode Operation : Supports off-grid/grid-tied dual modes, providing reliable power supply for critical loads such as hospitals and communication base stations.
Low Energy Consumption Operation : In a case study of an off-grid power station in Tibet, the system's continuous power supply stability reached 99.9%, and diesel consumption decreased by 72%.

V. Clustered Grid Connection for Large Ground-mounted Power Stations

PV Grid-tied Cabinet Scenario Requirements ：
Hundred-megawatt scale ground-mounted power stations need to achieve efficient grid connection, power prediction, and reactive power compensation.
Grid-tied Cabinet Functions ：

High Capacity Access : Single cabinet maximum 1.6MW capacity access (e.g., Western PV Base case).
Fiber Optic Communication Interface : Linked with SCADA system to achieve functions such as power prediction and reactive power compensation.
Multi-machine Parallel Technology : Curtailment rate reduced to below 2%, grid connection efficiency increased by 18%.

VI. Microgrid Energy Storage and PV-Storage Integration

PV Grid-tied Cabinet Scenario Requirements ：
Microgrid and PV-storage-charging integrated scenarios require autonomous energy management and optimized dispatch.
Grid-tied Cabinet Functions ：

Peak Shaving and Valley Filling : Stores surplus electricity during the day, supplies power to air conditioning systems at night (e.g., a commercial complex in Zhejiang case, annual electricity savings exceed 180,000 yuan).
Fast Off-grid Switching : Switches to energy storage power supply within 0.2 seconds during grid failure (e.g., ensuring power for hospitals, data centers).
Smart Dispatch : YH-ESC-230 energy storage system supports collaborative operation with PV and diesel generators to reduce carbon emissions.

VII. Special Environments and High Protection Requirement Scenarios

PV Grid-tied Cabinet Scenario Requirements ：
Harsh environments such as coastal high humidity, sand and dust, and extreme temperatures require ensuring long-term stable operation of equipment.
Grid-tied Cabinet Functions ：

IP65 Protection : Fearless of coastal high humidity and sand/dust (e.g., BWG grid-tied cabinet salt spray test for 720 hours).
Wide Voltage Adaptability : Supports a wide voltage range environment from 380V-690V (e.g., commercial and industrial rooftops, ground-mounted power stations).
Corrosion-resistant Design : Cold-rolled steel plate frame + electrostatic powder coating process, cabinet lifespan exceeds 10 years.

8. Power Quality Optimization and Grid Interaction

PV Grid-tied Cabinet Scenario Requirements ：
Solve problems such as grid fluctuations and harmonic interference, and improve power quality.
Grid-tied Cabinet Functions ：

Dynamic Reactive Power Compensation : The power factor of industrial park projects is increased to over 0.95.
Harmonic Suppression : Built-in filtering device to maintain grid voltage stability.
Anti-Islanding Protection : Avoid danger caused by continuous power supply from the photovoltaic system during grid failure.

The PV grid-tied cabinet adapts to diverse needs from household to hundred-megawatt power stations through modular design, international-grade component configuration, and intelligent monitoring. Its core value lies in:

Full-Scenario Coverage : Applicable to industrial and commercial, agricultural, household, off-grid, ground power stations, etc.
Efficiency and Safety : Ensuring power generation efficiency and safety through technologies such as MPPT tracking, over-voltage/under-voltage protection, and lightning protection design.
Flexible Expansion : The 25mm module hole design supports future expansion, and modular units improve operation and maintenance efficiency.

Whether it's industrial and commercial users pursuing economic benefits or remote areas focusing on energy self-sufficiency, the PV grid-tied cabinet can provide a "one-stop" solution, contributing to the efficient utilization of renewable energy and stable grid operation.

Key words:

Application of surface-mounted base cabinets

Selection and Installation Essentials of Household Distribution Box

Hunan Chengyuan Electrical CO.,LTD