Abstract
Due to the increased environmental and economic challenges, in recent years, renewable based distribution generation has been developed. More penetrations from the side of consumers caused a new concept called microgrids which are able to stand with or without connection to the bulk power system. Control of microgrids in islanded mode is very crucial for decreasing the amplitude of frequency deviations as well as damping speed. This chapter aims to propose an optimal combination of FOPD and fuzzy pre-compensated FOPI approach for load-frequency control of microgrids in islanded mode. The optimization parameter of the control scheme is designed by the differential evolution (DE) algorithm which has been improved by a fuzzy approach. In the optimization, control effort is considered as a constraint. Due to the robustness and flexibility of the proposed method, the simulation results have been improved substantially. Robust performance of the proposed control method is examined through sensitivity analysis.
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Abbreviations
- K BESS :
-
BESS gain
- G BESS(s):
-
BESS Linear Transfer Function
- T BESS :
-
BESS time constant
- u :
-
Control effort
- G DEG(s):
-
DEG Linear Transfer Function
- T T :
-
DEG time constant
- K D :
-
Derivative gain of FOPD
- P DEG :
-
Electrical power of DEG
- G FC(s):
-
FC Linear Transfer Function
- T IN :
-
FC time constant
- T IC :
-
FC time constant
- T G :
-
FC time constant
- T FC :
-
FC time constant
- K FESS :
-
FESS gain
- G FESS(s):
-
FESS Linear Transfer Function
- T FESS :
-
FESS time constant
- K p2 :
-
FOPI proportional gain
- β :
-
Fractional order of Integral
- α :
-
Fractional order of the derivative
- K I :
-
Integral gain of FOPI
- P L :
-
Load power
- Δf :
-
Microgrid frequency deviations
- P BESS :
-
Output electrical power of BESS
- P FC :
-
Output electrical power of FC
- P FESS :
-
Output electrical power of FESS
- P PV :
-
Output electrical power of PV
- K p1 :
-
Proportional gain of FOPD
- G PV(s):
-
PV Linear Transfer Function
- P sol :
-
The solar heat power (light intensity)
- G load(s):
-
Transfer function of the model of load disturbance
- G sol(s):
-
Transfer function of solar power generation model
- G wind(s):
-
Transfer function of wind power generation model
- P W :
-
Wind mechanical power
- P WTG :
-
WTG electrical power
- K W :
-
WTG Gain
- G WTG(s):
-
WTG Linear Transfer Function
- T W :
-
WTG time constant
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Jamshidi, F., Salehizadeh, M.R., Gholami, F., Shafie-khah, M. (2020). An Optimal Approach for Load-Frequency Control of Islanded Microgrids Based on Nonlinear Model. In: Amini, M. (eds) Optimization, Learning, and Control for Interdependent Complex Networks. Advances in Intelligent Systems and Computing, vol 1123. Springer, Cham. https://doi.org/10.1007/978-3-030-34094-0_11
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