scholarly journals Assessment of research directions for high voltage direct current power systems. Quarterly technical progress report, January 1-March 31, 1979

1979 ◽  
Author(s):  
W Long
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Technical Progress ◽  
Direct Current ◽  
Progress Report ◽  
Research Directions ◽  
High Voltage Direct Current

scholarly journals Comparative Study of AC and Positive and Negative DC Visual Corona for Sphere-Plane Gaps in Atmospheric Air

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2671 ◽  
Author(s):  
Jordi-Roger Riba ◽  
Andrea Morosini ◽  
Francesca Capelli
Keyword(s):  
Experimental Data ◽  
Field Strength ◽  
Electric Field ◽  
Power Systems ◽  
Electric Field Strength ◽  
High Voltage ◽  
Direct Current ◽  
Complex Nature ◽  
High Voltage Direct Current ◽  
Surface Electric Field

Due to the expansion of high-voltage direct current (HVDC) power systems, manufacturers of high-voltage (HV) hardware for alternating current (ac) applications are focusing their efforts towards the HVDC market. Because of the historical preponderance of ac power systems, such manufacturers have a strong background in ac corona but they need to acquire more knowledge about direct current (dc) corona. Due to the complex nature of corona, experimental data is required to describe its behavior. This work performs an experimental comparative analysis between the inception of ac corona and positive and negative dc corona. First, the sphere-plane air gap is analyzed from experimental data, and the corona inception voltages for different geometries are measured in a high-voltage laboratory. Next, the surface electric field strength is determined from finite element method simulations, since it provides valuable information about corona inception conditions. The experimental data obtained are fitted to an equation based on Peek’s law, which allows determining the equivalence between the visual corona surface electric field strength for ac and dc supply. Finally, additional experimental results performed on substation connectors are presented to further validate the previous results by means of commercial high-voltage hardware. The results presented in this paper could be especially valuable for high-voltage hardware manufacturers, since they allow determining the dc voltage and electric field values at which their ac products can withstand free of corona when operating in dc grids.

scholarly journals Latin Hypercube Sampling Method for Location Selection of Multi-Infeed HVDC System Terminal

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1646 ◽  
Author(s):  
Xiangqi Li ◽  
Yunfeng Li ◽  
Li Liu ◽  
Weiyu Wang ◽  
Yong Li ◽  
...  
Keyword(s):  
Power Systems ◽  
High Voltage ◽  
Direct Current ◽  
Latin Hypercube Sampling ◽  
Small Signal ◽  
Small Signal Stability ◽  
High Voltage Direct Current ◽  
Signal Stability ◽  
Load Demand ◽  
Oscillation Modes

Owing to the stochastic states of power systems with large-scale renewable generation, the impact of high-voltage direct current (HVDC) systems on the stability of the power system should be examined in a probabilistic manner. A probabilistic small signal stability assessment methodology to select the best locations for multi-infeed high-voltage direct current systems in alternating current (AC) grids is proposed in this paper. The Latin hypercube sampling-based Monte Carlo simulation approach is taken to generate the stochastic operation scenarios of power systems with the consideration of several stochastic factors, i.e., load demand and power generation. The damping ratio of the critical oscillation modes and the controllability of power injection to oscillation modes are analyzed by the probabilistic small signal stability. A probabilistic index is proposed to select the best locations of high-voltage direct current systems for improving the damping of the oscillation modes. The proposed methodology is applied to an IEEE 39 bus system considering the stochastic load demand and power generation. The results of probabilistic small signal stability assessment and a time-domain simulation show that the installation of a high-voltage direct current system on the selected locations can effectively improve the system damping.

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