Emergency Power Support and Voltage Stability Analysis of the AC/DC Hybrid Transmission System

2012 ◽  
Vol 614-615 ◽  
pp. 1033-1037
Author(s):  
Yuan Xin Hong ◽  
Guang Qing Bao
Keyword(s):  
Voltage Stability ◽  
Transmission System ◽  
Obvious Effect ◽  
Parallel Transmission ◽  
Hvdc Transmission ◽  
System A ◽  
Ac Power ◽  
Hybrid Transmission ◽  
Emergency Power ◽  
The Stability

With the completion of Three Gorges Project, the power system in China is forming a huge AC/DC network. In the hybrid AC/DC parallel transmission system, a line fault will cause fluctuations even crash of the system. The HVDC transmission system based on the emergency DC power support (EDCPS) can provide a fast emergency power support for the interconnected AC power grid flexibly and improve the stability of AC power. A model of AC/DC hybrid transmission system is established in the PSCAD/EMTDC simulation environment. An improved PID controller is firstly introduced to the hybrid AC/DC transmission system. The simulation result shows the EDCPS has an obvious effect on keeping the voltage stability of the system.

scholarly journals Research on Applicability of the Practical Transient Voltage Stability Criterion Based on Voltage Magnitude and Sag Duration

2021 ◽  
Vol 11 (10) ◽  
pp. 4569
Author(s):  
Guoteng Wang ◽  
Zheng Xu ◽  
Zheren Zhang
Keyword(s):  
Power Systems ◽  
Voltage Stability ◽  
Stability Boundary ◽  
Theoretical Derivation ◽  
System A ◽  
Transient Voltage Stability ◽  
Practical Engineering ◽  
Transient Voltage ◽  
The Stability ◽  
Application Scope

Voltage sags threaten the transient voltage stability of power systems. To evaluate the transient voltage stability, practical criteria based on voltage magnitude and sag duration are widely used in practical engineering. However, the applicability of practical criteria needs to be studied. In this paper, in a single-load system, a theoretical derivation was first made to obtain the transient voltage stability boundary. Then, by studying the relationship between the practical criteria and the stability boundary, the application scope of the practical criteria was determined. The application scope described in this paper can guide operators to use the practical criteria correctly and avoid misjudgment of the transient voltage stability as much as possible. Finally, a case study based on PSCAD/EMTDC is presented, and the simulation results verified the conclusions proposed in this paper.

scholarly journals Voltage Stability Analysis and Stability Improvement of Power System

2015 ◽  
Vol 5 (2) ◽  
pp. 189 ◽  
Author(s):  
Pavithren Pavithren ◽  
Raman Raghu Raman ◽  
Pratap Nair ◽  
K. Nithiyananthan
Keyword(s):  
Stability Analysis ◽  
Power Systems ◽  
Power System ◽  
Voltage Stability ◽  
Research Work ◽  
Voltage Collapse ◽  
Interconnected System ◽  
Voltage Instability ◽  
System A ◽  
The Stability

<p>The main objective of this research work is to analysis the voltage stability of the power system network and its improvement in the network.voltage stability of a power system. A system enters a state of voltage instability when a disturbance, increase in load demand, or change in system condition causes a progressive and an uncontrollable drop in voltage or voltage collapse. The continuing increase in demand for electric power has resulted in an increasingly complex, interconnected system, forced to operate closer to the limits of the stability. This has necessitated the implementation of techniques for analyzing and detecting voltage collapse in bus bar or lines prior to its occurrence. Simple Newton Raphson algorithm based voltage stability analysis has been carried out. Matlab based simulations for all the factors that causes voltage instability has been implemented and analyzed for an IEEE 30 bus system. The proposed model is able to identify the behavior of the power systems, network under various voltage stability conditions and its possibility of recovery/stability improvement of the power system network has been discussed.</p>

VSC Controllers for Multiterminal HVDC Transmission System: A Comparative Study

2020 ◽  
Vol 45 (8) ◽  
pp. 6411-6422 ◽  
Author(s):  
Md. Ismail Hossain ◽  
Md. Shafiullah ◽  
Mohammad Abido
Keyword(s):  
Comparative Study ◽  
Transmission System ◽  
Hvdc Transmission ◽  
System A

Research on Load Modeling Stability Control Based on AC/DC Hybrid Transmission System

2013 ◽  
Vol 380-384 ◽  
pp. 3271-3274
Author(s):  
Ying Liu ◽  
Li Jie Ding ◽  
Jun Wang ◽  
Zhou Jing Zhang
Keyword(s):  
Coupling Effect ◽  
Stability Control ◽  
Transmission System ◽  
Control Technique ◽  
System Matrix ◽  
Load Modeling ◽  
Hvdc System ◽  
System A ◽  
Hybrid Transmission ◽  
Synthesis Procedure

A stability control technique for load modeling is proposed in AC/DC hybrid transmission system. A frequency-dependent mult-infeed HVDC system matrix is obtained accurately via the complex curve fitting technique. With the mult-infeed HVDC system matrix the mutual coupling effect is included in the synthesis procedure automatically, resulting in a great effect on improving load model precision and adaptability.

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