Coordinated frequency control of thermal units with DC system in a wind-thermal-bundled system transmitted by High Voltage Direct Current (HVDC) line

2015 ◽  
pp. 7-12
Author(s):  
Jie Dang ◽  
Yi Tang ◽  
Mengchen Song ◽  
Jia Ning ◽  
Xiangyun Fu
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Frequency Control ◽  
Dc System ◽  
High Voltage Direct Current ◽  
Hvdc Line

scholarly journals Heuristic remedial actions in the reliability assessment of high voltage direct current networks

2021 ◽  
Vol 11 (6) ◽  
pp. 4622
Author(s):  
Mario A. Rios ◽  
Maria F. Perez
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Reliability Assessment ◽  
Test System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Dc System ◽  
High Voltage Direct Current ◽  
Operating Limits ◽  
Remedial Actions

<p>Planning of high voltage direct current (HVDC) grids requires inclusion of reliability assessment of alternatives under study. This paper proposes a methodology to evaluate the adequacy of voltage source converter/VSC-HVDC networks. The methodology analyses the performance of the system using N-1 and N-2 contingencies in order to detect weaknesses in the DC network and evaluates two types of remedial actions to keep the entire system under the acceptable operating limits. The remedial actions are applied when a violation of these limits on the DC system occurs; those include topology changes in the network and adjustments of power settings of VSC converter stations. The CIGRE B4 DC grid test system is used for evaluating the reliability/adequacy performance by means of the proposed methodology in this paper. The proposed remedial actions are effective for all contingencies; then, numerical results are as expected. This work is useful for planning and operation of grids based on VSC-HVDC technology.</p>

scholarly journals A Frequency–Power Droop Coefficient Determination Method of Mixed Line-Commutated and Voltage-Sourced Converter Multi-Infeed, High-Voltage, Direct Current Systems: An Actual Case Study in Korea

2019 ◽  
Vol 9 (3) ◽  
pp. 606 ◽  
Author(s):  
Gyusub Lee ◽  
Seungil Moon ◽  
Pyeongik Hwang
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Frequency Control ◽  
Reducing Power ◽  
Determination Method ◽  
Actual Case ◽  
High Voltage Direct Current ◽  
Voltage Sourced Converter ◽  
Mixed Line ◽  
Frequency Power

Among the grid service applications of high-voltage direct current (HVDC) systems, frequency–power droop control for islanded networks is one of the most widely used schemes. In this paper, a new frequency-power droop coefficient determination method for a mixed line-commutated converter (LCC) and voltage-sourced converter (VSC)-based multi-infeed HVDC (MIDC) system is proposed. The proposed method is designed for the minimization of power loss. An interior-point method is used as an optimization algorithm to implement the proposed scheduling method, and the droop coefficients of the HVDCs are determined graphically using the Monte Carlo sampling method. Two test systems—the modified Institute of Electrical and Electronics Engineers (IEEE) 14-bus system and an actual Jeju Island network in Korea—were utilized for MATLAB simulation case studies, to demonstrate that the proposed method is effective for reducing power system loss during frequency control.

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