scholarly journals PLL wrap function for synchronization in phase jump disturbances

2021 ◽  
Vol 41 (1) ◽  
pp. e84955
Author(s):  
Clementina Rueda Germán ◽  
Iván de Jesús Rivas Cambero ◽  
Hossam A. Gabbar ◽  
José Humberto Arroyo Núñez
Keyword(s):  
Phase Error ◽  
Reference Signal ◽  
Generation System ◽  
Phase Tracking ◽  
Electrical Grid ◽  
Abrupt Changes ◽  
The Time Domain ◽  
Electric Power Generation Systems ◽  
Power Generation Systems ◽  
Sync Pulse

Synchrony plays a major role in the interconnection process between local electric power generation systems and the electrical grid. Grid phase disturbances prevent the generation system from maintaining synchrony. Therefore, an efficient phase tracking method is necessary in order to detect phase jumps and abrupt changes in amplitude. In this paper, we propose a software-designed method to strengthen phase tracking based on the wrap process of a second-level Phase Locked Loop (PLL). The term ‘wrap’ means establishing the phase values of the reference signal in intervals of π to match it with the values obtained from the PLL output (sync pulse). To quantify phase error, a mathematical transformation of the time domain to the frequency domain is implemented. The validity of the proposed wrap function is verified using electrical disturbances.

scholarly journals Phase Tracking Sequences for 5G NR in 52.6-71 GHz Band: Design and Analysis

2021 ◽  
Author(s):  
Alexander Maltsev ◽  
Andrey Pudeev ◽  
Seonwook Kim ◽  
Suckchel Yang ◽  
Seunghwan Choi ◽  
...  
Keyword(s):  
Phase Noise ◽  
Time Domain ◽  
Communication Systems ◽  
Phase Error ◽  
Reference Signal ◽  
Phase Tracking ◽  
Noise Compensation ◽  
Novel Approach ◽  
Filter Size ◽  
Training Resources

This paper presents a novel approach to the phase tracking reference signal (PTRS) design for phase noise impact compensation in the 5G NR communication systems intended to work in a new 52.6 GHz to 71 GHz frequency band. For detailed problem illustration, the phase noise compensation algorithms are discussed and explained, from the basic common phase error (CPE) compensation to the MMSE-base inter-carrier interference (ICI) filtering. Performance of the different phase noise compensation algorithms is investigated for the baseline PTRS accepted in the current 5G NR specification and compared with the newly proposed approach to the PTRS design. This approach is based on nulling the subcarriers adjacent to the reference signals to minimize influence of the ICI on the estimation process. It was shown that new nulling PTRS design outperforms currently used distributed PTRS structure. In addition, numerical results represent a trade-off between the filter size and the amount of the allocated training resources to achieve better performance. It was shown that proposed PTRS structures and processing algorithms give ICI compensation level very close to optimal scheme and thus, different approaches (such as time domain compensation) may be required for further progress.

An Adaptive Phase Tracking Scheme of OFDM Wireless Communication System

2013 ◽  
Vol 336-338 ◽  
pp. 1798-1803
Author(s):  
Qian Du ◽  
Wen Wu Xie
Keyword(s):  
Kalman Filter ◽  
Wireless Communication ◽  
Channel Estimation ◽  
Error Estimation ◽  
Communication System ◽  
Phase Error ◽  
Basic Structure ◽  
Adaptive Kalman Filter ◽  
Phase Tracking ◽  
New Phase

This paper proposes a new phase tracking algorithm for the 802.11a system. Since this system illuminates the basic structure of 802.11a system, and introduces the OFDM frame generation principle based the transmitter, phase error estimation and channel estimation. On the basis of this, this paper presents a phase tracking scheme based on adaptive Kalman filter, and then simulates the process based on 802.11a system. The result indicates that the BER has been improved because of this adaptive phase tracking scheme.

scholarly journals Development of a Low-NOx LBG Combustor for Coal Gasification Combined Cycle Power Generation Systems

1989 ◽  
Author(s):  
M. Sato ◽  
T. Abe ◽  
T. Ninomiya ◽  
T. Nakata ◽  
T. Yoshine ◽  
...  
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Coal Gasification ◽  
Combined Cycle ◽  
Generation System ◽  
Combustion Technology ◽  
Power Generation System ◽  
Combustion Tests ◽  
Power Generation Systems

From the view point of future coal utilization technology for the thermal power generation systems, the coal gasification combined cycle system has drawn special interest recently. In the coal gasification combined cycle power generation system, it is necessary to develop a high temperature gas turbine combustor using a low-BTU gas (LBG) which has high thermal efficiency and low emissions. In Japan a development program of the coal gasification combined cycle power generation system has started in 1985 by the national government and Japanese electric companies. In this program, 1300°C class gas turbines will be developed. If the fuel gas cleaning system is a hot type, the coal gaseous fuel to be supplied to gas turbines will contain ammonia. Ammonia will be converted to nitric oxides in the combustion process in gas turbines. Therefore, low fuel-NOx combustion technology will be one of the most important research subjects. This paper describes low fuel-NOx combustion technology for 1300°C class gas turbine combustors using coal gaseous low-BTU fuel as well as combustion characteristics and carbon monoxide emission characteristics. Combustion tests were conducted using a full-scale combustor used for the 150 MW gas turbine at the atmospheric pressure. Furthermore, high pressure combustion tests were conducted using a half-scale combustor used for the 1 50 MW gas turbine.

scholarly journals On the Phase Tracking Reference Signal (PT-RS) Design for 5G New Radio (NR)

2018 ◽  
Author(s):  
Yinan Qi ◽  
Mythri Hunukumbure ◽  
Hyungju Nam ◽  
Hyunil Yoo ◽  
Saidhiraj Amuru
Keyword(s):  
Reference Signal ◽  
Phase Tracking ◽  
New Radio

NEW DEVELOPMENT OF ANALYSIS TOOL FOR OPTIMIZING GENERATION COST WITH GAS EMISSION VIA AN ELECTROMAGNETISM LIKE ALGORITHM

2016 ◽  
Vol 78 (6-3) ◽  
Author(s):  
F.Y.C. Albert ◽  
S.P. Koh ◽  
C. P. Chen ◽  
S. K. Tiong
Keyword(s):  
Power Generation ◽  
Objective Function ◽  
Environmental Concern ◽  
Economic Dispatch ◽  
Complex Problem ◽  
Analysis Tool ◽  
New Development ◽  
Generation Cost ◽  
Electric Power Generation Systems ◽  
Power Generation Systems

This paper addresses the preliminary new development results of the evolutionary algorithm technique to optimize the formulated problems incorporating the generation cost with emission gas as objective function or constraints. The power generation cost with emission gas are a complex problem which also the major concerns in electric power generation systems in the Environmental or Economic Dispatch Problems (EDP). Thus, due to environmental concern the electrical utilities required to minimize the emission level while optimizing the thermal generating units at a minimum generating cost and hence, satisfying the load demand and the emissions. In this work the electromagnetism-Like algorithm (EML) has been employed for optimizing generation cost and emission constraints economic dispatch problem. The proposed decision analysis tool software in this work will optimize the generation cost with emission gas objective function. The best generation cost with emission gas solution are obtained from different fuel technology via the developed software. 

New Type Hydroelectric Units to Coexist With Natural Ecosystem

2007 ◽  
Author(s):  
Akira Inagaki ◽  
Daisuke Tanaka ◽  
Toshiaki Kanemoto
Keyword(s):  
Turbine Unit ◽  
Global Environment ◽  
Natural Ecosystem ◽  
Hydroelectric Power ◽  
Natural Ecosystems ◽  
Hydroelectric Unit ◽  
New Type ◽  
Electric Power Generation Systems ◽  
Power Generation Systems ◽  
Water Drain

To prevent the warming global environment, the hydropower should occupy the attention of the electric power generation systems as clean and cool energy sources with the highest density. For the next leap in the hydroelectric power developments, however, we are under obligations to conserve natural ecosystems and/or to coexist with natures. To meet such circumstances, this paper proposes two kinds of the new type hydroelectric unit applicable to tidal currents, mountain torrents, rivers and/or water drain systems, and discusses the characteristics of the model turbine/unit.

Preliminary Research of a Zero CO2 Emission Power Generation System

2010 ◽  
Author(s):  
Jing-yu Ran ◽  
Chang-lei Qin
Keyword(s):  
Power Generation ◽  
Co2 Emission ◽  
Generation System ◽  
Emission Power ◽  
Generation Efficiency ◽  
Technical Problems ◽  
The Earth ◽  
Emission System ◽  
Power Generation System ◽  
Power Generation Systems

CO2 is a main greenhouse gas fazing the Earth. So countries around the world are actively studying the methods of capturing CO2 to reduce emission. In this paper, firstly a brief review was carried out on the research development and technical problems of three typical near-zero CO2 emission power generation systems. Focus was made on the construction of one possible commercially applied zero emission system, which has new principle but relatively conservative sections. Preliminary analysis and calculation of energy and mass flow have been finished to evaluate its performance. The results showed that apart from zero CO2 emission, a relatively tempting efficiency could be sustained. Theoretically, higher than 90% purity of CO2 and 63% generation efficiency of the whole system can be achieved.

scholarly journals Design of an All-Digital Synchronized Frequency Multiplier Based on a Dual-Loop (D/FLL) Architecture

VLSI Design ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Maher Assaad ◽  
Mohammed H. Alser
Keyword(s):  
Integrated Circuit ◽  
Reference Signal ◽  
Digital Processing ◽  
System On Chip ◽  
Frequency Multiplier ◽  
Experimental Results ◽  
Clock Signal ◽  
Phase Tracking ◽  
Frequency Locked Loops ◽  
On Chip

This paper presents a new architecture for a synchronized frequency multiplier circuit. The proposed architecture is an all-digital dual-loop delay- and frequency-locked loops circuit, which has several advantages, namely, it does not have the jitter accumulation issue that is normally encountered in PLL and can be adapted easily for different FPGA families as well as implemented as an integrated circuit. Moreover, it can be used in supplying a clock reference for distributed digital processing systems as well as intra/interchip communication in system-on-chip (SoC). The proposed architecture is designed using the Verilog language and synthesized for the Altera DE2-70 development board. The experimental results validate the expected phase tracking as well as the synthesizing properties. For the measurement and validation purpose, an input reference signal in the range of 1.94–2.62 MHz was injected; the generated clock signal has a higher frequency, and it is in the range of 124.2–167.9 MHz with a frequency step (i.e., resolution) of 0.168 MHz. The synthesized design requires 330 logic elements using the above Altera board.

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