Verification of a novel method of detecting faults in medium-voltage systems with covered conductors

This paper describes the use of new methods of detecting faults in medium-voltage overhead lines built of covered conductors. The methods mainly address such faults as falling of a conductor, contacting a conductor with a tree branch, or falling a tree branch across three phases of a medium-voltage conductor. These faults cannot be detected by current digital relay protection systems. Therefore, a new system that can detect the above mentioned faults was developed. After having tested its operation, the system has already been implemented to protect medium-voltage overhead lines built of covered conductors.Web of Science24228827

Energy savings by application of supercapacitor storage in trolleybus supplying station – analysis of experimental results

In 2011–2013, stationary supercapacitor storage developed by the Electrotechnical Institute in Warsaw was put into trial operation in the trolleybus substation “Północna” (North) located in Gdynia. The article presents the results recorded during supercapacitor storage operation and discusses the impact of the storage on energy consumption savings. Guidelines for selecting a location for stationary supercapacitor storage were carried out based on exploitation experience

MODELING OF TROLLEYBUS TRANSPORT SUPPLY SYSTEM

Článek se zabývá simulací napájecího systému pro trolejbusy s využitím statistického modelování pomocí metody Monte Carlo. Ověření modelu bylo provedeno na základě výsledků měření napětí a proudů v trolejbusovém systému v městě Gdyni. V článku je prezentován případ studie využití metody Monte Carlo pro analýzu snížení požadavku na energii v trolejbusové dopravě s využitím superkapacitorových stanic nebo změnou konfigurace napájecího systému.The article demonstrates simulation of trolleybus transport supply system using the Monte Carlo statistical modeling. Verification of this model was implemented by com-parison with the results of measure currents and voltages in Gdynia trolleybus network. In article is presented the case study of using Monthe Carlo methods for analysis of increasing energy recovering in trolleybus transport by installing supercapacitors stations or reconfiguration of supply system topology in case of trolleybus network in Gdynia city

The impact of the overhead line's power supply system spatial differentiation on the energy consumption of trolleybus transport: planning and economic aspects

Nowadays the issue of electric energy saving in public transport is becoming a key area of interest, which is connected both with a growth in environmental awareness of the society and an increase in the prices of fuel and electricity. It can be achieved by reducing of the transmission losses in supply system or by the improving of the usage of the regenerative breaking. The spatial differentiation of the energy supply system of public transport is one of the elements, which has significant impact on the energy consumption. Paper presents the theoretical analysis of the impact of supply system topology on the energy consumption and extensive measurement analysis realized in Gdynia (Poland) trolleybus system. First published online: 13 Oct 201

Innovative bidirectional isolated high-power density on-board charge for vehicle-to-grid

This paper deals with developing and implementing a bidirectional galvanically isolated on-board charger of a high-power density. The power density of the new charger was 4 kW/kg and 2.46 kW/dm(3), and the maximum efficiency was 96.4% at 3.4 kW. Due to the requirement to achieve a high-power density, a single-stage inverter topology was used. Regarding switching losses, due to the topology of the circuit with so-called hard switching, the switching frequency was set to 150 kHz. A laboratory prototype was built to verify the properties and operating principles of the described charger topology. The on-board charger has been tested in a microgrid test platform. Due to the parasitic properties of the transformer and other electronic components, overvoltage with subsequent oscillations occurred on the primary side of the transformer and damped resonance on its secondary side. These parasitic properties caused interference and especially voltage stress on the semiconductor elements. These undesirable phenomena have been eliminated by adding an active element to the charger topology and a new transistor control strategy. This new switching control strategy of transistors has been patented.Web of Science2221art. no. 847

Smart grid technologies in electric power supply systems of public transport

Nowadays the issue of electric energy saving in public transport is becoming a key area of interest which is connected both with a growth in environmental awareness of the society and an increase in the prices of fuel and electricity. It can be achieved by improving the usage of regenerative breaking. In 2016 the Przedsiębiorstwo Komunikacji Trolejbusowej (PKT, Trolleybus Transport Company) in Gdynia began practical implementation of Smart Grid solutions within its trolleybus network. These activities constitute an element of the project ELIPTIC, realised by PKT within the scientific research fund Horizon 2020. The first stage of implementing intelligent network solutions was completed in 2016, and further activities are planned for the next few years. This paper presents a review of Smart Grid solutions which can be implemented in urban traction supply systems, describes the PKT experience concerning the implementation of Smart Grid solutions in trolleybus network supply system to date

Limiting energy consumption of the electric public transport: review of methods and operational experience

Transport jest jednym z głównych konsumentów energii. Rosnące ceny nośników energii oraz wzrost zagrożeń ekologicznych czynią coraz bardziej istotnym ograniczanie zużycia energii w sektorze transportowym. W artykule przedstawiono do- świadczenia w redukcji zużycia energii Przedsiębiorstwa Komunikacji Trolejbusowej w Gdyni.Transport is one of the main energy consumers. Increasing prices of energy products along with the rise of environmental hazards, make it even more important to limit the energy consumption in the transport sector. This article presents experiences in the reduction of energy consumption of the Trolleybus Communication Enterprise in Gdynia

Bilateral power supply of the traction network as a first stage of Smart Grid technology implementation in electric traction

Since 2001, trolleybus system in Gdynia has been involved in many activities related to the reduction of power consumption, both in terms of implementation and research and development. In PKT, in cooperation with SESTO company, started applications of Smart Grid technologies in supply network: the bilateral supply. The paper presents results of this this novel investment

Potential Application of Solar Energy Systems for Electrified Urban Transportation Systems

The paper presents a novel approach toward the use of solar energy systems in public transportation. The concept of energy generation in PV systems for supplying a trolleybus transportation system is proposed for the city of Gdynia (Poland). The suggested way of energy production allows reducing the environmental harm impact of the municipal transportation system. Moreover, the proposed way of green energy use can be a more profitable alternative for selling transport items (trolleybuses) to the public energy grid. The presented analysis is based on the Monte Carlo Model method of stochastic simulation. It allows taking in consideration the random nature of the vehicle movement caused by road congestion and the uncertainty of the solar radiation. Several localisations of the PV system and the different structures of traction supply systems were analysed. The results of the analyses showed that despite of the uneven load in the traction power supply, it is possible to use 80% of the generated solar system energy