New energy power supply system for urban rail traction network and control method thereof

Abstract

The invention discloses a new energy power supply system for an urban rail traction network and a control method. The system comprises an independent energy storage system located in a middle sectionof a line and a wind-photovoltaic-energy storage hybrid power generation system located at a car depot or a parking lot at an end of the line. The method comprises a step of obtaining a load predictedpower and an expected peak-valley value according to offline prediction data and historical data and judging whether there is a load based on urban rail running data, and a step of judging an operating condition based on a real-time voltage, comparing a predicted load power at a next moment and the expected peak-valley value and judging whether a state is a load running peak-valley state, and determining different control strategies through a judgment result to realize the effective control of an energy storage device in an independent energy storage system and a wind-photovoltaic-energy storage hybrid power generation device and an energy storage device in the wind-photovoltaic-energy storage hybrid power generation system. According to the invention, the consumption of renewable energysources such as local wind and light can be promoted, the grid pressure fluctuation is improved, the peak-load shifting is carried out for the load while the regenerative braking energy is effectivelyrecycled, the operating cost of urban rails is reduced, and the economic benefits are good.

Description

technical field [0001] The invention belongs to the technical field of urban rail traction power supply, in particular to a new energy power supply system and control method for urban rail traction network. Background technique [0002] With the acceleration of urbanization in my country, urban rail transit has developed rapidly and comprehensively in large and medium-sized cities. As of the end of 2017, a total of 34 cities in mainland China have opened urban rail transit and put it into operation. It is estimated that by 2020, more than 50 cities in my country will be open for operation, and the length of operating lines will exceed 6,000km. At the same time, urban rail is a major energy-consuming household in the city, and the energy-saving and environmental protection issues brought about by its rapid development cannot be underestimated. Among them, traction load energy consumption accounts for about 55% of the total energy consumption of urban rail. In order to save ...

AI Technical Summary

Problems solved by technology

However, the violent fluctuation of urban rail load will directly impact the system. New energy power generation is uncertain, and the control is relatively complicated. Whether both parties can adapt well is facing challenges.

[0005] Some scholars have conducted preliminary research on the integration of photovoltaic / energy storage into the traction network, but no wind-solar-storage multi-energy complementary structure has been connected to the urban rail power supply system; existing research focuses on the topology of the system under a single substation and control strategies, etc., the energy flow of the entire line was not considered in the analysis process, and the structure of the new energy power generation system for the entire line was rarely mentioned in the literature; in the existing research, the use of energy storage to recover regenerative braking energy while simultaneously Shaving peaks and filling valleys for morning and evening peak loads

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