Solution existence of the optimization problem of truss structures with frequency constraints

2000 ◽  
Vol 37 (30) ◽  
pp. 4043-4060 ◽  
Author(s):  
W.H. Tong ◽  
J.S. Jiang ◽  
G.R. Liu
Keyword(s):  
Optimization Problem ◽  
Truss Structures ◽  
Solution Existence ◽  
Frequency Constraints

scholarly journals Existence of Polynomial Combinatorics Graph Solution

2020 ◽  
Vol 2 (1) ◽  
pp. 7-13
Author(s):  
Mardiningsih ◽  
Saib Suwilo ◽  
Ihda Hasbiyati
Keyword(s):  
Integer Programming ◽  
Optimization Problem ◽  
Feasible Solution ◽  
Solution Set ◽  
Decision Variable ◽  
Solution Existence

The Polynomial Combinatorics comes from optimization problem combinatorial in form the nonlinear and integer programming. This paper present a condition such that the polynomial combinatorics has solution. Existence of optimum value will be found by restriction of decision variable and properties of feasible solution set or polyhedra.

scholarly journals Optimal Operation of Isolated Microgrids Considering Frequency Constraints

2019 ◽  
Vol 9 (2) ◽  
pp. 223 ◽  
Author(s):  
Josep-Andreu Vidal-Clos ◽  
Eduard Bullich-Massagué ◽  
Mònica Aragüés-Peñalba ◽  
Guillem Vinyals-Canal ◽  
Cristian Chillón-Antón ◽  
...  
Keyword(s):  
Optimization Problem ◽  
Maximum Load ◽  
Optimization Method ◽  
Optimal Operation ◽  
System Operation ◽  
Frequency Constraints ◽  
Autonomous Operation ◽  
Frequency Constraint ◽  
Photovoltaic Power ◽  
Pv Generation

Isolated microgrids must be able to perform autonomous operation without external grid support. This leads to a challenge when non-dispatchable generators are installed because power imbalances can produce frequency excursions compromising the system operation. This paper addresses the optimal operation of PV–battery–diesel-based microgrids taking into account the frequency constraints. Particularly, a new stochastic optimization method to maximize the PV generation while ensuring the grid frequency limits is proposed. The optimization problem was formulated including a minimum frequency constraint, which was obtained from a dynamic study considering maximum load and photovoltaic power variations. Once the optimization problem was formulated, three complete days were simulated to verify the proper behavior. Finally, the system was validated in a laboratory-scaled microgrid.

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