On July 28, the National Energy Administration issued the Guiding Opinions on the Implementation of the 13th Five-Year Plan for Renewable Energy Development, which plans the scale of PV development from 2017 to 2020 during the 13th Five-Year Plan period. According to the document, a new construction index is proposed for the next four years (2017-2020), that is, the capacity of PV Forerunner Projects is required to reach 8GW per year, with a total of 32GW in four years.
The purpose of the PV "Forerunner" Program is to promote the application of advanced technology and products and industrial upgrading by building PV power generation demonstration bases that apply advanced technology, and new technology application demonstration projects. This is consistent with the initial intention of CYG SUNRI Co., Ltd.
Tackle Difficulties in Coal Mining Subsidence Areas
Since the launch of the "Forerunner" Program, CYG SUNRI has won the bids for two Forerunner projects in Datong and Yangquan in succession. At the beginning of the project construction, in view of the poor natural conditions, short construction period and large project scale in subsidence areas, CYG SUNRI proposed to build modular substations. Based on modular design and prefabricated structure, equipment production, installation and commissioning can be done in the factory. The prefabricated substations can be delivered to the project site and then installed. This scheme sped up the construction progress, improved the project quality, optimized land use and reduced the construction cost. Based on the experience of Datong Forerunner Project, CYG SUNRI made a project summary, further optimized the scheme and the project management to further enhance project construction quality and reduce the overall project cost.
The Datong Forerunner Project is the first national advanced technology PV demonstration base in China, and it is also the first Forerunner project implemented by CYG SUNRI, so it attached great importance to the implementation of the project. Feng Liang, as the project manager, felt under stress due to the requirements of technical application innovation and the tight delivery schedule of the project. To this end:
◆In terms of technology , CYG SUNRI set up an inter-departmental research team. In order to play a demonstration role in the application of new technologies, the company combined modular design with integrated design. It not only considered the independence and integration of each functional module, but also took the rational cabin layout into account, so as to achieve the goals of rapid installation and commissioning, and easy operation and maintenance.
◆In terms of information network optimization of the booster station , on the premise of ensuring network security and reliability, CYG SUNRI established an integrated high-speed information platform, trying to break the secondary professional barriers for realizing information sharing and providing technical support for unattended and remote operation and maintenance of the power station.
◆In terms of the project schedule , the company established the project manager responsibility system and developed a project management plan to control the project progress and reduce project changes. It also established the weekly project report system for the factory and the daily project report system for the project site, and improved the project communication management system. Finally, with the support of the overall platform of the company and the joint efforts of the members of the project department, the project was successfully put into operation.
Most of the Forerunner Projects are in mountainous areas or coal mining subsidence areas, where the terrain is complex and ground sinks to a lower level. Due to the influence of mined-out subsidence areas on surface buildings, it is necessary to consider the optimal design of prefabricated cabins in addition to flexible foundation and rigid foundation.
When designing prefabricated cabins in the mined-out subsidence areas, CYG SUNRI simulated the influence of surface subsidence on the cabins with the finite element analysis software, and took reinforcement measures for vulnerable parts of the cabins. Moreover, it adjusted the load distribution of all parts in the cabins to reduce base pressure.
◆ In terms of cabin unit design: The length of each unit should be controlled at about 15m, and the facade form of the building should be simpler. Light structure should be selected to reduce the dead weight of the walls. CYG SUNRI installed a settlement meter in each prefabricated cabin to monitor the settlement change, and adjusted or reinforced the cabins or equipment installation structure in time; Moreover, it applied shock absorption devices with adjustable height to the bottoms of the cabins. It used steel wire shock absorbers at the bottoms of the cabins. The main functions of this technology are as follows: Firstly, like the traditional steel wire shock absorption stands, the steel wire shock absorbers can greatly reduce the seismic action transmitted from the ground to the superstructure; Secondly, if the foundation subsidence of soft soil layer, coal mining subsidence and earthquake fault lead to the relative drop of foundation, the height of the lower shock absorber can be adjusted to restore the flatness of the superstructure.
In addition, CYG SUNRI is excel at designing prefabricated cabins that can adapt to different regional environments. Across China, CYG SUNRI’s prefabricated cabins protect the safety of power grids in the cold and dry northeast region, the windy and dusty northwest region, and the extremely hot and humid east region.
The “Model Projects of CYG” Set Good Examples for New “Forerunner” Projects
During the "Thirteenth Five-Year Plan" period, wind power generation and solar power generation will see a rapid growth. As for the existing Forerunner Projects, the technical threshold is too low, and the orientation is shifted. The purpose of the Forerunner Projects is to promote the technological progress of the PV industry. However, the technical indicators are very each to reach, leading to price competition instead of technological competition among enterprises. On the basis of summarizing the implementation experience of the existing PV Forerunner Program, the National Energy Administration plans to launch Super Forerunner Projects. It is believed that the technical threshold for the projects will be raised, and patented technology and application performance will be new scoring indicators. Since 2013, the construction scale of PV power stations in China has been expanding. Many projects have the problems of tight schedule of product delivery and short construction period. In order to ensure that the PV power station projects can be replicated and maintained, promote the improvement of engineering construction technology, and ensure the safety and reliability of PV power station construction, the design standardization of the industry is in urgent need of improvement, which is also conducive to further reducing the cost throughout the life cycle.
At the 2nd China PV + Innovation and Development Forum and Forerunner Base Experience Exchange Meeting, the Datong PV Power Generation "Forerunner" Base Project implemented by CYG SUNRI officially passed the acceptance inspection by the experts with 100% of the indicators meeting the requirements. The project promotes advanced technology and speeds up cost reduction, and its operation is good. In addition to promoting the application of new products, improving power generation efficiency and reducing costs, the standardized design of PV booster stations and PV zones can be promoted to realize rapid replication of batch projects. Through the transformation from factory processing to factory commissioning, the scope of on-site construction and operations can be further reduced. On-site operation and maintenance personnel should be minimized by intelligent management. With the unattended and remotely operated and maintained dispatching management system, the operation status of substation equipment can be accurately monitored. Once a fault is found, the fault can be accurately located, and solutions and suggestions will be given, thus shortening the time of inspection and making operation and maintenance easier.
In the field of new energy and PV, CYG SUNRI can provide customers with the most comprehensive power solutions, including power generation unit monitoring system, booster unit monitoring system, grid-connected access system, remote monitoring, operation and maintenance system, etc. CYG SUNRI is a leading company in China and even in the world in the above fields, because it has long focused on major grid and distribution network business, and it’s natural for it to expand its business to the energy field.
In terms of microgrid energy storage, CYG SUNRI successfully delivered the first microgrid construction project in Tibet and completed the first demonstration project of PV, energy storage and charging microgrid in Shenzhen. The Coqen Independent Microgrid Project in Tibet is 4,700 meters above sea level, with an MW-level wind/PV/diesel/lead acid battery/lithium battery/hydroenergy independent power supply system. So far, it is one of the microgrid projects with largest number of energy types and the highest system complexity.
In the PV, Energy Storage and Charging Microgrid Demonstration Project in Shenzhen, the resources on the roof of the charging station are used to build a distributed PV power station. With the supporting energy storage system, users can obtain income from PV power generation and the peak-valley electricity price difference. In addition, CYG SUNRI helps users solve the problem that stations cannot be built due to insufficient distribution capacity, so that important loads in power stations will not be affected when large power grids fail. In the future, CYG SUNRI will give full play to its strong technical strength and rich project experience in microgrids and energy storage based on the highly flexible “multiple types of distributed clean energy in the PV, energy storage and combined power supply system” to achieve the goal of "regional coordination and interconnection, global optimization and control”. It will try to realize the complementation among multiple types of energy, use various energy sources in a green and efficient manner, and create more value for customers and even for the social economy.
