scholarly journals A Novel Receiving End Grid Planning Method with Mutually Exclusive Constraints in Alternating Current/Direct Current Lines

2021 ◽  
Vol 13 (13) ◽  
pp. 7141
Author(s):  
Yi Luo ◽  
Yin Zhang ◽  
Muyi Tang ◽  
Youbin Zhou ◽  
Ying Wang ◽  
...  
Keyword(s):  
Direct Current ◽  
Constraint Satisfaction Problem ◽  
Short Circuit ◽  
Power Grid ◽  
Alternating Current ◽  
Planning Method ◽  
System Stability ◽  
Planning Model ◽  
Power Grid Planning ◽  
Grid Planning

The large-scale application of high-voltage direct current (HVDC) transmission technology introduces mutually exclusive constraints (MEC) into the power grid planning, which deepens the complexity of power grid planning. The MECs decrease the planning efficiency and effectiveness of the conventional method. This paper proposes a novel hybrid alternating current (AC)/direct current (DC) receiving end grid planning method with MECs in AC/DC lines. The constraint satisfaction problem (CSP) is utilized to model the MECs in candidate lines and then the detailed planning model, in which mutually exclusive candidate lines are described by mutually exclusive variable and constraint sets. Additionally, the proposed planning model takes the hybrid AC/DC power system stability into consideration by introducing the multi-infeed short circuit ratio (MISCR). After establishing the hybrid AC/DC receiving end grid planning model with MECs, the backtracking search algorithm (BSA) is used to solve the optimal planning. The effectiveness of the proposed hybrid AC/DC grid planning method with MECs is verified by case studies.

scholarly journals A Planning Method of Hybrid AC/DC Receiving End Grid with Mutually Exclusive Constraints

2021 ◽  
Vol 256 ◽  
pp. 01036
Author(s):  
Yi Luo ◽  
Yin Zhang ◽  
Muyi Tang ◽  
Youbin Zhou ◽  
Ying Wang ◽  
...  
Keyword(s):  
Power Systems ◽  
Transmission Lines ◽  
Large Scale ◽  
Search Algorithm ◽  
Constraint Satisfaction Problem ◽  
Power Grid ◽  
Planning Method ◽  
Optimal Planning ◽  
Planning Model ◽  
Grid Planning

With the large-scale application of LCC-HVDC and VSC-HVDC in power systems, the mutually exclusive constraints (MES) appear in the optimal planning of hybrid AC/DC receiving end power grid. The MES increase the scale of the construction set of substations and the transmission lines and decrease the planning efficiency and effectiveness of the conventional method. This paper proposes a novel hybrid AC/DC receiving end grid planning method with MES. Constraint satisfaction problem (CSP) is utilized to model the set of mutually exclusive selected lines, in which mutually exclusive candidate lines are converted to mutually exclusive variables and then introduced into the planning model as constraints. After establishing the hybrid AC/DC receiving end grid planning model with MES, the backtracking search algorithm (BSA) is used to solve the optimal planning. The effectiveness of the proposed hybrid AC/DC power grid planning method with MES is verified by case studies.

scholarly journals Research on Improved Fault Current Analysis Method for Flexible Direct Current Power Grid Considering Alternating Current Feed

2021 ◽  
Vol 9 ◽  
Author(s):  
Yinfeng Sun ◽  
Xin Xiong ◽  
Zhenhao Wang ◽  
Guoqing Li ◽  
Xueguang Wu ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Direct Current ◽  
Large Scale ◽  
Short Circuit ◽  
Power Grid ◽  
Equivalent Circuit Model ◽  
Alternating Current ◽  
Fault Current ◽  
Dc Line ◽  
Selection Of

Flexible direct current (DC) grid can realize large-scale renewable energy, wide-area coordinated complementation, and reliable power transmission. It is an important development that can be used to support high-voltage and large-capacity flexible DC transmission in the future. The short-circuit current of the DC line is one of the important bases for the selection of key main equipment parameters such as converter valves, DC circuit breakers, and reactors in the flexible DC grid. In this paper, a flexible DC grid equivalent circuit network model with alternating current (AC) feed-in is established. Aiming at the monopolar ground fault of the flexible DC grid grounded through the metal loop, an optimized traditional matrix calculation method is proposed to obtain the accurate line fault current value. On this basis, with an actual engineering background, the equivalent circuit model of the four-terminal bipolar flexible DC power grid is established, and the influence of grounding position, grounding parameters, and current-limiting reactor on the fault current of the DC line is analyzed. Finally, simulation using the PSCAD software verifies the effectiveness and accuracy of the proposed method. The method proposed in this paper can provide the necessary bases and references for the selection of flexible DC grid equipment.

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