Technical Services/Products

Rail transit consumes huge amount of electricity, using urban rail transit parking lots, vehicle sections owned by the vehicle base building roofs and elevated stations, laying and installing solar photovoltaic systems, combining solar photovoltaic power generation systems and urban rail transit construction, and using solar energy to provide clean electricity to urban rail transit itself and even to the society, is not only of great significance in terms of energy saving, but also of great reference significance in terms of guiding the construction of newly-built rail transit projects. It is of great significance not only in saving energy, but also in guiding new rail transit projects.

Aiming at the capacity and characteristics of electricity load of different types of urban rail transit projects, combined with the power supply capacity and project cost of solar photovoltaic power generation and energy storage system, it puts forward a reasonable and feasible solution of general application of solar photovoltaic power generation and energy storage system suitable for urban rail transit projects, and provides technical support and safeguard measures for further improving energy conservation and emission reduction, reducing operation cost and improving power supply reliability of enterprises. This technology has been authorized two invention patents and one utility model.

Technical Features and Advantages/Innovation Points

(1) Optimized configuration of capacity of urban rail transit photovoltaic power generation system: Combined with the actual operating characteristics of rail transit power loads, the operation strategy is formulated, and an optimization model is established with voltage fluctuation and economy as the objective function to obtain the optimal configuration of capacity of photovoltaic power generation system, which is conducive to enhancing the matching between photovoltaic system and rail transit power supply system;

(2) PV short-term power generation prediction method and system based on model parameter optimization: Aiming at the randomness, volatility, and intermittency characteristics of PV power generation, it solves the problems of complex modeling, low prediction accuracy, and security risks in short-term power generation prediction;

(3) Design of photovoltaic power generation system based on distributed renewable energy sources: for the expanding scale of rail transit line network and the construction of photovoltaic power generation system by using large area of unused roofs, a series of measures such as intelligent anti-islanding protection and low-voltage ride-through protection are designed to solve the problems such as higher operation cost, unreasonable energy structure, non-advanced management mode, and difficult to configure the protection scheme;

(4) Create a green near-zero carbon field section with a high-density photovoltaic power generation system as the core: realize regional green energy substitution by creating a high-density photovoltaic power generation system; make every effort to create a green star field section through the exploration and innovation of green construction technology, and reduce the intensity of carbon emissions during the construction period of the field section; and construct a green and low-carbon operation and maintenance mode for the field section, effectively reducing the intensity of carbon emissions during the operation and maintenance period.

Applications/Scenarios

Vehicle base/unused land: there are few obstructions around, easy to capture sunlight, and the area is sizable. For example, the Guangzhou Metro Yuzhu Vehicle Section PV project project occupies a roof area of about 70,000 square meters, with a total installed capacity of 5MWp, and was officially put into operation in 2019, which is the first urban rail transit vehicle maintenance base PV power generation project in Guangdong Province, and is also the largest distributed PV power station combining with urban rail transit in Guangdong, Hong Kong and Macao Greater Bay Area. During the operation period, the average annual power generation capacity is 4.5 million kW-h, which can replace about 1,215t of standard coal per year. the PV power generation system is integrated into the 33kV medium-voltage power supply ring network, and in addition to providing high-quality and green power for the operation and maintenance of the vehicle section itself, it can transmit the remaining power to the main line of Line 5, which will provide green power for the traction of main line trains and station lighting, and will save more than 400,000 RMB of electricity cost per year.

Elevated stations: PV modules are set up on the roofs of elevated stations. For example, Guangzhou Metro Line 14 and Line 21 set up PV power generation systems in six elevated stations, with an installed capacity of 1.326MWp. The PV power generation system is connected to the 400V bus of the traction mixing house or bucking house, realizing that the PV power generation is completely self-generated and self-consumed, and providing high-quality green power for the rail transit.

Demonstration project of creating green near-zero carbon field section: the demonstration project of green near-zero carbon field section of Shitang South Vehicle Base of Nanjing Line 11 explores the green near-zero carbon field section with high-density photovoltaic power generation system as the core, and makes every effort to push forward the low-carbon, energy-saving and environmental protection of the urban rail industry chain, and provides the engineering case of the construction of new-generation green near-zero carbon field section for the whole country.

Elevated section: The outer area of the girder wing of the elevated section is wide enough to hang solar panels. It can be used for interval lighting and interval maintenance load.

Road lighting: the field section of the road is more, road lighting can be used independent photovoltaic power supply system pole lighting. Municipal engineering has been commonly used, the subway project also has application cases.

Bus station: set photovoltaic station, energy storage station, electric vehicle charging and discharging station as one station. Utilizing photovoltaic and peak and valley electricity price income.