Combined Power Supply System Trolley and Economic Benefits From Its Use

Abstract

In this article the main types of public transport were overviewed, including buses and trolleybuses. But there is no optimal kind of transport: buses are mobile, but they generate huge amounts of gas emissions into the environment and run on expensive fuel, and trolleybuses are cheaper to operate due to cheap electricity, but because of their attachment to transmission lines, they have extremely low mobility and in the event of malfunctions on the trolleybuses themselves, accidents with contact lines or congestion, they will not be able to overcome the area where it occurred. A trade-off between using buses and regular trolleybuses operating solely from the mains is to use a high-voltage battery trolley. The article presents the advantages and disadvantages of the above-mentioned types of public transport, shows the structural diagrams of power systems conventional trolleybus and trolley with high-voltage battery, the so-called combined power system. The advantages of the combined power supply system compared to the usual ones are given. The principle of operation of the mechanism of extraction of energy from the network and from one of the key elements of the combined system - the capacitive drive is explained. Power loss estimation using the combined system is performed and afterwards it showed that losses of the ordinary power supply system are twice higher than losses of combined power supply system. The impact of traffic jams and accidents on the profit of the trolleybus route and on the profits of the passengers it transports is shown and it appeared that the more traffic jams and line voltage interruptions are the more economic losses trolleybus route will have and the less salary it’s passengers will get. The study of bus and trolleybus routes of the city of Kyiv was conducted and the corresponding map of these routes was made. The total length of the trolleybus and bus routes is estimated and the map shows the length of the common sections of the routes and the non-coincident sections. The capacity of the high-voltage battery required to cover the trolleybus with the autonomous running of part of the routes where the buses run was calculated. In addition, the total battery capacity was calculated. Considering the cost of the specific power consumption of the battery, i.e. the price of 1 kW of its energy, its cost was estimated. At the end of the article, the overall economic effect of using a trolleybus system is calculated. The common economic effect for all trolleybus passengers was calculated.