A control method for a new energy power supply system for urban rail traction network

Abstract

The invention discloses a new energy power supply system and a control method for urban rail traction network, including an independent energy storage system located in the middle section of the line and a wind-solar-storage combined power generation system located in the depot or parking lot at the end of the line; according to offline prediction data, Obtain load forecast power and expected peak-to-valley values ​​from historical data, and then judge whether there is a load based on urban rail traffic data; judge operating conditions based on real-time voltage, and compare the load forecast power and expected peak-to-valley values ​​at the next moment to judge whether it is load operation According to the peak and valley state, different control strategies are determined by judging the results, so as to realize effective control of the energy storage device in the independent energy storage system, the wind-solar combined power generation device and the energy storage device in the wind-solar-storage combined power generation system. The invention can not only promote the consumption of renewable energy such as local scenery, but also improve grid voltage fluctuations, effectively recycle regenerative braking energy and at the same time cut peak loads and fill valleys, reduce urban rail operating costs, and have good economic benefits.

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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