The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In paper, a solution for the integration of a home energy management system (HEMS) to be a part of an utility LVDC distribution system is introduced. The considered LVDC network comprise network-level battery energy storage system (BESS), public DC distribution system with a single connection point to medium-voltage AC network and multiple prosumer customers. The usage of the BESS is multi-objective...
It has been shown that high-frequency (HF) band power line communication (PLC), that is, the HomePlug 1.0 specification, is feasible for a low-voltage direct current (LVDC) smart grid (SG) system, where power electronics and low-voltage DC are applied to the electricity distribution. In this paper, the applicability of the latest HomePlug specification, Green PHY (GP), is studied within the LVDC PLC...
This paper concentrates on the effects of d.c. mains voltage level selection on earthing and protection of the low voltage direct current (LVDC) distribution systems. Among the low voltage range the possibilities are to go up to 1500 VDC in unipolar and ±750 VDC in bipolar LVDC system. Voltage level selection is one of the main tasks in LVDC system design process as it directly affects the electric...
The paper focuses on developing the control for directly connected battery energy storage system (BESS) in low voltage direct current (LVDC) distribution systems. The main purpose of the control is to provide essential connection/disconnection and charge/discharge functions. Additionally, due to direct connection, it is necessary to implement control functions for management of the power flows in...
Communication is needed in modern smart grids (SGs) for instance in load control, automatic metering infrastructure (AMI), and grid monitoring and protection. Power line communication (PLC) is studied as the data transmission solution for a low-voltage direct current (LVDC) electricity distribution system in the DC grid; channel analysis, noise in the channel, and the performance of both the narrowband...
In this paper the implementation of the galvanic isolation in the low voltage direct current (LVDC) network is discussed. The galvanic isolation can be implemented either with a 50 Hz transformer located at the customer AC output of the customer-end inverter (CEI) or with an isolated DC-DC converter at the input DC network side of the CEI. However, the former solution results in a significant increase...
It has been shown that high-frequency (HF) band power line communication (PLC) is a feasible data transmission method for a smart grid concept, namely for a low-voltage direct current (LVDC) electricity distribution system. However, because of the signal attenuation, the communication distances in the LVDC grid are limited with the HF band PLC. Hence, the new narrowband (NB) PLC should also be tested...
<?Pub Dtl?>In this paper the need for a better design of the galvanic isolation and the output filter inductor in the customer-end inverter (CEI) of the low voltage DC (LVDC) network is discussed. The galvanic isolation can be implemented either with a 50 Hz transformer after the CEI or with an isolated DC-DC converter between the DC network and the CEI. However, the 50 Hz transformer solution...
It has been shown that high-frequency (HF) band power-line communication (PLC) is a suitable data transmission method for the smart grid concept, namely a low-voltage direct current (LVDC) distribution system. In this paper, the PLC channel analysis in the LVDC system is continued with a detailed noise analysis. Noise signals from the terminals of PLC couplers are measured in the time domain. Noise...
Low-Voltage Direct Current (LVDC) distribution network is a novel approach to the LV distribution. The system greatly differs from the AC solutions used today and therefore, a laboratory platform of the LVDC distribution system has to be implemented. The system is designed to provide testing and measuring platform for the LVDC distribution technology. This paper presents the implementation of the...
In this paper we investigate the effect of the number and delays of discrete channel impulse response components on the accuracy of wireless system simulations. The subject is relevant in considering large systems such as wireless networks, where realistic results are required, but it is also necessary to apply models that are simple enough to enable practically realizable simulation times. We present...
Pan-European project B21C (broadcasting for the 21st century) aims to develop technology for DVB-T2 (digital video broadcasting, terrestrial), which is a spectrum efficient broadcasting system for future. The evaluated technologies include MIMO, which has been widely studied in perspective of B3G (beyond 3rd generation) systems, but never for any UHF band systems. In addition, the latest decision...
Capacitor voltage oriented PI control is implemented to control the phase voltage of a customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. Synchronous dq-frame is used to control the phase voltage to avoid the drawbacks of the PI control, such as possible steady-state error. In the paper the controller equations are derived from the system equations and then the controllers...
An LVDC (low voltage DC) distribution system is a promising technology to be used in future smart distribution system having high level cost-efficiency and reliability. Protection of an LVDC distribution system differs from the traditional 20/0.4 kV AC distribution network; direct current and IT network complicates the customer-end protection. This paper describes practical protection solutions for...
Linear quadratic Gaussian (LQG) based phase voltage control is implemented. The regulation performance, estimation accuracy and interference sensitivity of different LQG control schemes is evaluated and compared. Paper reveals that it is possible to make the control system more insensitive to EMI when compared to dual-loop PI control and that the synchronous co-ordinate control scheme's all-around...
Short-circuit protection devices applied to customer-end network protection today require multiple times the nominal current to operate within the required time limits. A three-phase 400 VAC distribution network supplies sufficient short-circuit current in customer-end faults, and reaching the required protection time poses no problems. When a Low-Voltage Direct Current (LVDC) network is used to supply...
Proportional-integration (PI) controller scheme is implemented to control the phase voltage of the customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. In the inverter output, the LC-filter is used. In order to avoid resonances caused by the filter, the feedback and the feedforward filteration is used. It is shown that basic PI control system cannot drive the steady-state...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.