1. Optimal DG Allocation and Volt–Var Dispatch for a Droop-Based Microgrid
- Author
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Suryanarayana Doolla, Bikash C. Pal, Yusuf Gupta, Kishore Chatterjee, and Engineering & Physical Science Research Council (E
- Subjects
Optimization ,Technology ,Droop control ,General Computer Science ,Linear programming ,NETWORK RECONFIGURATION ,Computer science ,020209 energy ,Reactive power ,POWER ,02 engineering and technology ,DISTRIBUTION-SYSTEMS ,0915 Interdisciplinary Engineering ,Load profile ,Bus network ,Engineering ,MILP optimisation ,reactive power sharing ,volt– ,Control theory ,OPTIMAL OPERATION ,0202 electrical engineering, electronic engineering, information engineering ,Voltage droop ,Microgrids ,var ,loss minimisation ,INTEGER LP MODEL ,VIRTUAL IMPEDANCE ,Science & Technology ,reconfiguration ,Resource management ,020208 electrical & electronic engineering ,DISTRIBUTED GENERATION ,Impedance ,Engineering, Electrical & Electronic ,sizing siting ,AC power ,Sizing ,Planning ,microgrid ,0906 Electrical and Electronic Engineering ,Nonlinear system ,Voltage control ,MINIMIZATION ,Microgrid ,COEFFICIENTS - Abstract
Unequal reactive power sharing amongst distributed generators (DG) is a significant concern while operating a droop based microgrid. The reasons for this unequal reactive power sharing include the difference in feeder impedances, uneven distribution of loads and DGs in terms of size and locations. In this article, a mixed-integer linear programming (MILP) problem applicable for a droop based microgrid has been proposed to achieve proportional reactive power sharing amongst DGs while maintaining very low line losses. Firstly, the optimal sizing and placement of DGs are investigated. This includes a detailed discussion on the linearisation of various nonlinear terms involved in the formulation. Subsequently, a day–ahead dispatch is generated for these DGs for a given load profile. Additionally, network reconfiguration has been incorporated for further improvement in performance. The effect of considering a practical constant impedance-current-power (ZIP) load model, instead of simply considering constant impedance loads, has also been assessed. The proposed formulation has been tested on a 33 bus network which has been modified to represent an islanded microgrid. The results obtained validate the accuracy of the proposed planning and dispatch method and demonstrate its utility in achieving proportional reactive power sharing amongst the DGs while incurring very low line losses.
- Published
- 2021