scholarly journals Optimization Strategy of SVC for Eliminating Electromagnetic Oscillation in Weak Networking Power Systems

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3489
Author(s):  
Huabo Shi ◽  
Xinwei Sun ◽  
Gang Chen ◽  
Hua Zhang ◽  
Yonghong Tang ◽  
...  
Keyword(s):  
Parameter Optimization ◽  
Short Circuit ◽  
Power Grid ◽  
Oscillation Mode ◽  
Voltage Regulation ◽  
Optimization Strategy ◽  
Long Distance ◽  
Large Power ◽  
Electromagnetic Oscillation ◽  
Long Distance Transmission

The central Tibet AC interconnection project (CTAIP), which connects the Tibet power grid and the Sichuan power grid through a long distance transmission line of more than 1400 km, has a significant problem of voltage regulation. In order to improve the voltage regulation performance, six sets of ±60 Mvar static VAR compensators (SVC) were installed in the CTAIP. However, the SVCs may lead to electromagnetic oscillation below 50 Hz while improving voltage regulation capability. In this paper, the electromagnetic oscillation modes and the sensitivity of control parameters of SVC are analyzed. Then, the characteristics and influencing factors of the oscillation are discussed. It was found that there is an inherent electromagnetic oscillation mode below 50 Hz in the ultra-long distance transmission system. The employ of SVCs weaken the damping of this mode. Large proportional gain and integral gain (PI) parameters of SVCs can improve the voltage regulation performance, but weaken the electromagnetic oscillation mode damping. Therefore, a suppression method based on SVC PI parameters optimization is proposed to damp the oscillation. The essential of this method is to use the rising time of voltage response and setting time of SVCs as performance indicators of voltage regulation, and take the damping level of the electromagnetic oscillation mode as the performance index of SVC electromagnetic oscillation suppression ability. Combining the two indicators to form a comprehensive optimization index function, an intelligent optimization algorithm is applied. The process of SVC parameter optimization and the steps of multi-SVC parameter optimization in large power grids is proposed. Finally, PSCAD and real-time digital simulation (RTDS) simulation results verified the correctness of the proposed method. The optimization strategy was applied to CTAIP. The artificial grounding short circuit experimental results proved the effectiveness of the proposed strategy.

Research on Optimization Control Strategy for Limiting Short-Circuit Current Based on Fuzzy Quantitative Control

2012 ◽  
Vol 214 ◽  
pp. 527-530
Author(s):  
Guang Lei Li ◽  
Shu Min Sun ◽  
Yan Cheng ◽  
Hong Bo Li ◽  
Shuai Yuan
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Control Strategy ◽  
Short Circuit ◽  
Power Grid ◽  
Short Circuit Current ◽  
Sensitivity Index ◽  
Impedance Change ◽  
Large Power ◽  
Control Evaluation

To decrease short-circuit current, adjusting the power network operation by breaking transmission lines is the most economic and convenient measure. For large power grid, breaking transmission lines has thousands of combinations, so it's very difficult to find the best combination in a short time. Firstly, this paper formulated the sensitivity relationship between transmission line outage and impedance change. Then preliminary combinations schemes of transmission line outage were selected according to the sensitivity. Index values of factors were given using the fuzzy control evaluation. Finally, this paper determined optimal scheme from maximum priority and accomplished the accessorial intelligent optimize system of limiting short-circuit current. The rapidity and rapidity of the proposed control strategy was verified by calculating the actual power grid.

scholarly journals Electric Power Network Interconnection: A Review on Current Status, Future Prospects and Research Direction

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2179
Author(s):  
Imdadullah ◽  
Basem Alamri ◽  
Md. Alamgir Hossain ◽  
M. S. Jamil Asghar
Keyword(s):  
Renewable Energy ◽  
Smart Grid ◽  
Electric Power ◽  
Power Grid ◽  
Clean Energy ◽  
Current Status ◽  
Long Distance ◽  
Transmission Systems ◽  
Large Power ◽  
Grid Interconnection

An interconnection of electric power networks enables decarbonization of the electricity system by harnessing and sharing large amounts of renewable energy. The highest potential renewable energy areas are often far from load centers, integrated through long-distance transmission interconnections. The transmission interconnection mitigates the variability of renewable energy sources by importing and exporting electricity between neighbouring regions. This paper presents an overview of regional and global energy consumption trends by use of fuel. A large power grid interconnection, including renewable energy and its integration into the utility grid, and globally existing large power grid interconnections are also presented. The technologies used for power grid interconnections include HVAC, HVDC (including LCC, VSC comprising of MMC-VSC, HVDC light), VFT, and newly proposed FASAL are discussed with their potential projects. Future trends of grid interconnection, including clean energy initiatives and developments, UHV AC and DC transmission systems, and smart grid developments, are presented in detail. A review of regional and global initiatives in the context of a sustainable future by implementing electric energy interconnections is presented. It presents the associated challenges and benefits of globally interconnected power grids and intercontinental interconnectors. Finally, in this paper, research directions in clean and sustainable energy, smart grid, UHV transmission systems that facilitate the global future grid interconnection goal are addressed.

Research and Application of Phase-Sensitive Protection in Load Control Center

2011 ◽  
Vol 317-319 ◽  
pp. 1259-1262
Author(s):  
Chun Yu Xu ◽  
Li Jun Zheng ◽  
Jian Cheng Song ◽  
Yun Guang Gao
Keyword(s):  
Short Circuit ◽  
Signal Amplitude ◽  
Load Control ◽  
Long Distance ◽  
Large Power ◽  
Control Center ◽  
Three Phase ◽  
Phase Sensitive ◽  
Protection Circuit ◽  
Safe Load

The malfunction of short-circuit protection became increasingly serious in the fully mechanized face casused by large power equipment, more kind of loads and long distance power. According to the field requirements, the electrical characteristics between motor starting and three-phase short-circuit are compared, the phase-sensitive protection circuit combining current signal amplitude with power factor is designed, the protection data is tested and the protection characteristic is analyzed. The phase-sensitive protection circuit has been uesd in KJZ-4000-10（6）/3.3 flameproof and intrinsically safe load control center. The circuit is stable, sensitive and reliable. It has been proved that the short-circuit protection of power in underground is reliably realized.

UHV AC Placement Selection Method Based on the Short Circuit Current Coordination

2015 ◽  
Vol 738-739 ◽  
pp. 1280-1284
Author(s):  
Lin Lin Yu ◽  
Yu Fei Rao
Keyword(s):  
Computational Analysis ◽  
Short Circuit ◽  
Power Grid ◽  
Short Circuit Current ◽  
Selection Method ◽  
Impact Point ◽  
Empirical Methods ◽  
Low Loss ◽  
Long Distance ◽  
Ac Transmission

UHV AC transmission has a high transmission capacity, long distance, low loss, covers save etc. significant advantages, so it’s widely used in our country. But the placement of the UHV which was sent to select still major use projects empirical methods. This method lacks clarity and systematic. Meanwhile, it is difficult to adapt to complex changes in the overall demand for power grid. This paper developed a UHV AC placement selection method based on short-circuit current coordination. According to UHV grid and nearby 500kV grid short-circuit current coordination constraint, unreasonable impact point sent plan was excluded so that greatly unnecessary computational analysis was reduced. This can quickly determine the placement of reasonable UHV AC transmission project plan.

Research of Comprehensive Protection Device in Underground Coal Mine Lighting Power Grid

2013 ◽  
Vol 329 ◽  
pp. 304-307
Author(s):  
Xu Dan
Keyword(s):  
Real Time ◽  
Coal Mine ◽  
Short Circuit ◽  
Power Grid ◽  
Protection System ◽  
Protection Device ◽  
Long Distance ◽  
Cable Insulation ◽  
Underground Coal Mine ◽  
Existing Problems

In view of the present our country underground lighting power grid comprehensive protection device existing problems, this paper introduces a DSP-based long distance lighting comprehensive protection device. Short-circuit protection using adaptive random setting mode. Leakage protection using additional DC measurement theory.The device has the function of cable insulation level, the network current is monitored real-time and grid parameters are displayed in turn, which make the protection system more perfect and reliable.

Sign in / Sign up

Export Citation Format

Share Document