Control method and device for accessing energy-storage photovoltaic system into urban rail traction network

Abstract

The invention relates to a control method and a control device for accessing an energy-storage photovoltaic system into an urban rail traction network, wherein the method comprises the following steps that: 1) whether a photovoltaic battery has energy output or not is judged; if so, the photovoltaic battery has the energy output, a first direct current / direct current (DC / DC) converter and a second DC / DC converter connected with the photovoltaic battery are turned on, the photovoltaic battery starts to work, and then, the operation returns to step 2); if the judgment result shows that the photovoltaic battery does not have the energy output, the photovoltaic battery does not have energy to output, the first DC / DC converter and a second DC / DC converter connected with the photovoltaic battery are turned off, the operation returns to the step 1), whether the photovoltaic battery has the energy output or not is continuously judged, after the operation is repeated for n times, the photovoltaic battery stops working, and the operation returns to the step 2) and other steps. The device comprises the photovoltaic battery, the first DC / DC converter, the second DC / DC converter, a bidirectional DC / DC converter and energy storage equipment. Compared with the prior art, the control method and the control device have the advantages that the energy loss is low, the work efficiency is high, the stability is high, and the like.

Description

Technical field [0001] The invention relates to a control method and device for connecting a photovoltaic system to an urban rail traction network, in particular to a control method and device for connecting a photovoltaic system containing energy storage to an urban rail traction network. Background technique [0002] Urban rail transit has become the first choice for solving traffic congestion in large and medium cities due to its characteristics of fast, safe, punctual, large passenger capacity and light pollution. Urban rail vehicles are high-power DC impulsive loads and have the characteristics of rapid changes in time and space. Especially with the continuous increase of operation density and passenger capacity, as a large energy consumer, the problems of power supply safety and energy saving are becoming increasingly prominent. Therefore, it is necessary to carry out research on energy flow management of urban rail transit traction network and renewable energy access relat...

AI Technical Summary

Problems solved by technology

[0004] Within the scope of published documents at home and abroad, although the application of photovoltaic power generation is a current research hotspot, it mainly focuses on AC grid connection, involving the connection of distributed photovoltaic power generation systems with energy storage equipment to urban rail transit DC traction. The network topology and its control strategies are rarely reported in the literature

Images