A Graph Computation based Sequential Power Flow Calculation for Large-Scale AC/DC Systems
Wei Feng,Jingjin Wu,Chen Yuan,Guangyi Liu,Renchang Dai,Qingxin Shi,Fangxing Li +6 more
- 01 Aug 2019
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TL;DR: In this paper, a graph computation based sequential power flow calculation method for Line Commutated Converter (LCC) based large-scale AC/DC systems to achieve a high computing performance is proposed.
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Abstract: This paper proposes a graph computation based sequential power flow calculation method for Line Commutated Converter (LCC) based large-scale AC/DC systems to achieve a high computing performance. Based on the graph theory, the complex AC/DC system is first converted to a graph model and stored in a graph database. Then, the hybrid system is divided into several isolated areas with graph partition algorithm by decoupling AC and DC networks. Thus, the power flow analysis can be executed in parallel for each independent area with the new selected slack buses. Furthermore, for each area, the node-based parallel computing (NPC) and hierarchical parallel computing (HPC) used in graph computation are employed to speed up fast decoupled power flow (FDPF). Comprehensive case studies on the IEEE 300-bus, polished South Carolina 12,000-bus system and a China 11,119-bus system are performed to demonstrate the accuracy and efficiency of the proposed method.
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Citations
Holomorphic Embedding Based Continuation Method for Identifying Multiple Power Flow Solutions
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- 01 Apr 2021
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Graph Computing Based Distributed Parallel Power Flow for AC/DC Systems with Improved Initial Estimate
TL;DR: A high-performance graph computing-based distributed parallel implementation of the Sequential Method with an improved initial estimate approach for hybrid AC/DC systems is developed, capable of speeding up the entire computational process without compromising result accuracy.
Transient Stability
Renchang Dai,Guangyi Liu +1 more
- 29 Sep 2023
TL;DR: Transient stability is essential for power system operation and involves studying the system's ability to maintain synchronism under disturbances. Methods like controlling unstable equilibrium point, boundary of stability-region-based controlling unstable equilibrium point, and extended equal area criterion are used to estimate stability regions. Time-domain simulation and energy function method are commonly used to study transient stability.
References
Graph-based Preconditioning Conjugate Gradient Algorithm for "N-1" Contingency Analysis
Yiting Zhao,Chen Yuan,Guangyi Liu,Ilya Grinberg +3 more
- 01 Aug 2018
TL;DR: In this article, a graph-based preconditioning conjugate gradient (GPCG) approach is proposed for the nodal parallel computing in "N-1" CA.