Construction preparation and planning for large-scale photovoltaic grid-connected systems

Construction preparation and planning for large-scale photovoltaic grid-connected systems

(1) Personnel and equipment preparation

Once the design is complete, construction can begin. First, the project department was established, and various construction teams were established with the project manager as the team leader, and the advance team was composed of technicians, construction captains, and measurement teams. Conduct further investigations on the construction site, formulate “implementation construction organization design”, formulate construction plans and plans for equipment, personnel, and material requirements, and sign procurement contracts with relevant manufacturers for materials and equipment that need to be purchased. Complete the layout of key projects such as living camps and construction auxiliary facilities, build access roads, build access bridges and platforms, go through re-testing, raw material identification and mix selection and other pre-construction preparations to ensure that the conditions for starting construction are met, so that the project can start on time. Set up a supervision company according to needs, work under the management of the project department, and perform the supervision and management of the progress, quality, safety and cost of the project construction in the supervision contract.

Organize equipment and personnel to enter the site step by step according to the plan, and initially consider the construction teams entering the site in batches according to the construction organization design: first, preparatory work for personnel such as roadbed excavation, filling, fixed support foundation construction and mechanical operators; then there are the builders who install the component brackets, components, combiner boxes, cables and electricals. Construction machinery and equipment, such as excavators, bulldozers, pile drivers, road rollers and other equipment that are inconvenient to travel on the road, can be directly transported to the construction site by other vehicles, and other equipment that is convenient to travel directly from the company to the construction site.

(2) Preparation for construction water and electricity and other conditions

The construction water of photovoltaic power station consists of construction water, construction machinery water, and domestic water. The water source can be brought in from nearby, or it can be solved by drilling a well. The management, operation and maintenance of construction water shall be entrusted by the project management department of the engineering project department to the construction team in accordance with its planning and unified responsibility. Each group shall install water meters on the branch pipes before taking water, and each construction contractor shall obey the unified planning of water consumption and pay the water fee on time. During construction, construction water should be allocated reasonably to avoid the concentration of water consumption during peak construction.

Electricity is drawn from nearby lines, and the power distribution and transformation project builds an appropriate power distribution station area at the design position of the photovoltaic power station, and the construction lines are laid by buried cables. The main materials required for the project are sand and gravel, cement, steel, wood, oil and pyrotechnic materials, etc., which can be purchased nearby according to the situation.

(3) Specific construction plan

The construction principle requires that the ground is first, then the ground, and the depth is first and then the shallow. Construction sequence and construction drainage: According to the general deployment principle, the underground works will be constructed first, and then the above-ground works will be constructed.

The general layout of the construction shall be carried out according to the following basic principles: ①The layout of the construction site and temporary construction facilities should be compact and reasonable, in line with the technological process, convenient for installation, ensure convenient transportation, minimize secondary transportation, fully consider the construction process at each stage, and take care of the front and rear, and both left and right, so as to achieve the purpose of rational land use and land saving. ② Road access is the first. First, open the main road from the photovoltaic power station to the outside world, and then build the internal road of the power station according to the order of project construction. ③ The arrangement of construction machinery is reasonable, the load capacity of the construction electricity is fully considered, and its service scope is reasonably determined, so as to meet the construction needs without generating waste of machinery. ④The general layout should be as permanent and temporary as possible to save investment and reduce construction cost. ⑤ Partition scribing. According to the principle of point-to-surface, from near to far, the entire photovoltaic power station is divided into a comprehensive production area and a photovoltaic power generation area; the photovoltaic power generation area is divided into two batches for installation, commissioning and operation. This can not only improve construction efficiency, but also ensure that photovoltaic power plants are put into commercial operation in batches in advance. The wastewater generated during construction requires the construction unit to build a concentrated wastewater pool on site, and it can be discharged after sedimentation. At the same time, the construction unit is required to set up a mobile toilet on site to avoid the discharge of domestic sewage.

According to the overall layout of the photovoltaic power station, the road in the field should pass next to the photovoltaic cell modules to meet the needs of one-time transportation of equipment and installation of brackets and photovoltaic cell modules. In the power station transportation, the inverters, transformers, high-voltage switch cabinets, etc. of large equipment are placed at the designated location at one time according to the designated route, and the secondary transfer is minimized.

According to the general construction plan and the arrangement of each stage, the purpose is to fully ensure the key points of the staged construction and ensure the smooth implementation of the progress plan. Before the implementation of the project, formulate detailed plans for the use, entry and exit of large-scale machinery and tools, production, processing, stacking, and transportation plans for main materials and revolving materials, as well as adjustment plans for the advance and retreat of construction teams of various types, and network plans to ensure the progress of the project. Implement scientific and civilized management on the construction plane.

According to the implementation and adjustment of the project plan, the implementation plan is released in stages, including the adoption of the periodic schedule, the person in charge, the implementation standards, the reward and punishment standards, etc. During the implementation, according to each sub-item approach and operation plan, the regular construction site meeting and the project scheduling meeting are used to fully coordinate and negotiate, to issue the plan adjustment letter in time, and to conduct regular inspection and supervision.

Whether the construction plan is reasonable or not will directly affect the safety, quality, duration and cost of construction. Starting from the actual situation of the project, combined with its own characteristics, using scientific methods, comprehensively analyze and compare various factors, and formulate scientific, reasonable and economical construction plans.

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