voltage security
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2022 ◽  
Vol 203 ◽  
pp. 107674
Author(s):  
Mahmoud Roustaei ◽  
Armin Letafat ◽  
Morteza Sheikh ◽  
Alireza chabok ◽  
Ramin Sadoughi ◽  
...  

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1704
Author(s):  
Xu Luo ◽  
Fan Li ◽  
Li Fan ◽  
Tao Niu ◽  
Bo Li ◽  
...  

Considering the advantages that dynamic reactive power (var) equipment (such as synchronous condensers (SCs), which can control var independently and improve voltage stability), SCs are widely used in AC/DC hybrid power grid to provide emergency var and voltage support. In order to evaluate the dynamic var reserve capacity of SCs and analyze the influence of SCs on the operation characteristics of power system, a model with double-infeed line-commutated converter-based high-voltage direct currents (LCC-HVDCs) and SCs is established. Through theoretical derivation and PSCAD/EMTDC simulation, the effects of SCs on the operation characteristics of double-infeed LCC-HVDCs networks are studied. Then, the non-smooth voltage waveform of electromagnetic transient simulation is approximately transformed into smooth waveform by data fitting method. Finally, the processed voltage waveform is searched step by step to explore the boundary of voltage safety region to determine the dynamic var reserve capacity of SCs. The numerical results show that SCs can enlarge the voltage security region of the direct current (DC) subsystem, thus effectively improving the steady-state and transient security level of the double-infeed LCC-HVDCs networks.


2021 ◽  
Vol 9 ◽  
Author(s):  
Jidong Wang ◽  
Qiuming Xu ◽  
Huiling Su ◽  
Kaijie Fang

Increasing penetration of distributed generation (DG) has brought more uncertainty to the operation of active distribution networks (ADNs). With the reformation of the power system, increasingly more flexible loads access to distribution network through load aggregators (LAs), which becomes an effective way to solve these issues. Since LAs and ADNs are separate entities with different interests, the traditional centralized and deterministic optimization methods fail to meet the actual operational requirements of ADNs. Based on the linear power flow model, a robust optimal dispatching model of ADNs considering the influence of renewable DG’s uncertain output on voltage security constraints is established. Then, an independent optimal scheduling model for LAs is modeled based on the analysis of the composition and characteristics of flexible load in LAs. LAs and ADNs, as two different stakeholders, use a distributed modeling method to establish different economic optimization goals. The optimization problem is solved by decoupling the coupling exchanging power between LAs and ADNs into virtual controllable loads and virtual DGs. Finally, with the case study of a modified IEEE 33-bus system, the correctness and effectiveness of the proposed method are verified. The effects of the robust level and demand response incentive on the results are also analyzed.


2021 ◽  
Author(s):  
Peng Li ◽  
Yi Wang ◽  
Can Wang ◽  
Jinghang Lu ◽  
Xuewei Pan ◽  
...  

Author(s):  
Yogendra Kumar ◽  
Shweta Agrawal ◽  
Narayana Pradas Patidar ◽  
Sanjiv Kumar Jain

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