The communication of power line carrier (PLC) in the frequency of 20-500 kHz in the ultra-high voltage direct current (UHVDC) transmission line with ±800 V rated voltage and the radio communication range from 500...
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The communication of power line carrier (PLC) in the frequency of 20-500 kHz in the ultra-high voltage direct current (UHVDC) transmission line with ±800 V rated voltage and the radio communication range from 500 kHz-20 MHz near the converter substation and along the ultra-high voltage direct current transmission line are interfered strongly by high order harmonics from converters and direct current transmission line and neutral line of ultra-high voltage direct current transmission system. It's a virtual way to reduce power line carrier interference (PLCI) and radio interference (RI) to install PLC/RI filters at the terminals of the polar line and neutral line at the direct current side of converter substation. The power line carrier interference and radio interference from the ultrahigh voltage direct current transmission system with two series of 12 pulse converters in a pole line are produced by the chopping of valve voltage of converters and the discharging of electric corona and insulators. The limitation values for power line carrier interference and radio interference from the converter substation of ultra-high voltage direct current transmission system are analyzed in the paper. After calculating the total power line carrier interference and radio interference at the terminal of the direct current pole line and neutral line in the circumstance of PLC/RI filter schemes with a harmonic analysis program, a economical and practical PLC/RI filter scheme for limiting power line carrier interference and radio interference at the direct current side of ultra-high voltage direct current converter substation is produced.
The paper proposed a novel decentralized approach for congestion management via Optimal Resource Allocation (ORA) for the forward markets. The available capacities of possible congested transmission lines are consider...
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The paper proposed a novel decentralized approach for congestion management via Optimal Resource Allocation (ORA) for the forward markets. The available capacities of possible congested transmission lines are considered as commonly shared resources for bilateral and multilateral transactions in the market. Each transaction maximizes its profit using limited capacity of transmission line allocated by the ISO. Through the proposed decentralized optimization algorithms, the ISO searches the optimal allocation of the capacities of congested transmission lines to the individual transactions and finally the same market efficiency (social welfare) as centralized optimization is achieved. This decentralized approach is more suitable for power market environment since it does not require private and sensitive information submission from individual transactions to the ISO and the resource allocation decision is always feasible during iterations. The mathematical model, calculation procedure and relevant proof are presented. The computer test results from the IEEE 30 bus system show clearly the effectiveness of the approach and its consistency with the centralized optimization.
This paper focuses on the research on the DC bias due to magnetic storm and HVDC. In the paper, we introduce the DC bias problem of Jiangsu Yang-Huai transmit electric system and Southern power Grids, discuss the harm...
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The multi-objective fuzzy optimal method based on the fuzzified optimal solutions of single objectives need not list all non-inferior solution sets, which can optimize directly objectives in value area of variables. T...
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Harmonic pollution and reactive power compensation are the important power quality problems. This paper proposes a combined power filter system consisting of the parallel operation of a hybrid active power filter (HAP...
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A new method, which integrates the virtue of the probability and mathematical statistics with that of the fuzzy mathematics for power quality assessment, is proposed in this paper. The index showing an aspect of power...
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This paper puts forward a novel topology of controllable reactor, the structure is based on many small capacity thyristor controlled reactor (TCR) modules and a three-windings transformer connecting to system. The tra...
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This paper presents an identification method based on the iterative Prony to identify transfer function and configure PSS parameters using residue way. The iterative Prony is a very useful method to acquire power syst...
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This paper presents a theoretically analytical technique for determining the spectral components of high-power multilevel voltage source converters. The technique uses Double Fourier Series to analyze the output wavef...
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High current of HVDC grounding electrode will induce a high potential in the nearby substation ground grid if the soil resistivity is high. Once there are potential differences among the ground grids, direct current w...
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