A simple and accurate approach to solve the power flow for balanced islanded microgrids

Mumtaz, Faisal; Syed, Mazheruddin H.; Hosani, Mohamed Al; Zeineldin, H. H.

doi:10.1109/eeeic.2015.7165454

Cited by 36 publications

(40 citation statements)

References 17 publications

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“…If the fault generated is so small and cannot be detected by the relay, flywheel inverter will be used, which allows the increase in the value of the fault current [49,50]. As a result, fault current can easily be detected by the relay module and circuit can be kept safe [51,52,53].…”

Section: Protectionmentioning

confidence: 99%

Comprehensive Analysis of Planning Operation and Protection of Microgrid Systems

Muzzammel

2020

JENRR

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Microgrid is a decentralized system in which electrical sources and loads are connected in a way that operates normally in connection with and in synchronous with conventional grid. This system has the ability to work autonomously by disconnecting from conventional grid in island mode. Microgrid offers large number of advantages in power system. Among them, integration of renewable energy sources, reliability, two-way power flow and cost effectiveness are the significant merits of microgrids. Besides its advantages, different challenges are associated with the planning, operation and protection of microgrid systems. Safe two-way power flow, reliable switching of renewable energy, optimal power flow, quick isolation of faulty part from healthy system and incorporation of energy mix modeling are the major challenges behind its real time implementation. In this research, comprehensive analysis is carried out on the planning, operation and protection of microgrid model. A test system is developed in Matlab/ Simulink in which solar power source, wind power source and diesel power source are modelled and connected to residential, commercial and industrial loads. Optimal power flow is achieved through Newton’s method. In addition to this, operation of microgrid test system is ensured by the observation of voltage, current and power under steady state and transient conditions of wind based power generation, DC and AC parameters for solar power generation and generation and demand of power in the case of diesel based power generation within acceptable limits. Circuit breakers are installed to ensure protection against faults. Priority is made on the basis of promotion of renewable energy sources. Moreover, realization of microgrid is depicted with its hardware prototype.

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Section: Protectionmentioning

confidence: 99%

Comprehensive Analysis of Planning Operation and Protection of Microgrid Systems

Muzzammel

2020

JENRR

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“…where I SC i is the Norton equivalent current source; and Z c (ω) is the coupling impedance as shown in Fig. 2 Step 3: the bus voltages can be calculated from the injected currents as shown in (12).…”

Section: A Problem Formulationmentioning

confidence: 99%

“…Considering steady-state system frequency as one of the power flow variables, a three-phase power flow method was proposed in [6] using the Newton-trust region method considering decentralized droop control schemes for the DERs. A modified version of the conventional Gauss-Seidel method was used in [12], where load demands were shared by the DGs, keeping the system frequency and voltage within specified limits. Modified Newton-Raphson method was used in [13], where generator bus was formulated as droop bus considering the absence of the slack bus for an islanded microgrid.…”

Section: Introductionmentioning

confidence: 99%

Nature-inspired Hybrid Optimization Algorithms for Load Flow Analysis of Islanded Microgrids

Abdullah

Ahmed

Islam

2020

Journal of Modern Power Systems and Clean Energy

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Load flow analysis is a significant tool for proper planning, operation, and dynamic analysis of a power system that provides the steady-state values of voltage magnitudes and angles at the fundamental frequency. However, due to the absence of a slack bus in an islanded microgrid, modified load flow algorithms should be adopted considering the system frequency as one of the solution variables. This paper proposes the application of nature-inspired hybrid optimization algorithms for solving the load flow problem of islanded microgrids. Several nature-inspired algorithms such as genetic algorithm (GA), differential evolution (DE), flower pollination algorithm (FPA), and grasshopper optimization algorithm (GOA) are separately merged with imperialistic competitive algorithm (ICA) to form four hybrid algorithms named as ICGA, ICDE, ICFPA, and IC-GOA. Performances of these algorithms are tested on the 6-bus test system and the modified IEEE 37-bus test system. A comparison among the proposed algorithms is carried out in terms of statistical analysis conducted using SPSS statistics software. From the statistical analysis, it is identified that on an average, ICDE takes less number of iterations and consequently needs less execution time compared with other algorithms in solving the load flow problem of islanded microgrids.

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“…[1], [2] report the application of the forward-backward sweep power flow to island microgrids with radial structure, however [2] notes that the simulation of the Q-V droop control is very much dependent on the initial choice of the reactive power. The use of the classical transmission network power flow in island networks has been recently discussed [3]- [5]. Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Ref. [3] used a Gauss-Seidel approach, but it is expected to scale poorly on large networks; [5] proposed a Trust-Region Newton-Raphson solver to alleviate ill conditioning that is attributed to the narrow region of convergence in island mode. The islanded operation poses special challenges to conventional distribution power flow solvers, mainly the operation without a slack node and the simulation of droop control.…”

Section: Introductionmentioning

confidence: 99%

Compensation in Complex Variables for Microgrid Power Flow

Jabr

Džafić

Pal

2018

IEEE Trans. Power Syst.

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Abstract-The solution of the distribution network power flow in practical applications is based either on the forwardbackward sweep method for radial networks, or the current injection method for meshed networks. While the power flow in microgrids that operate in grid-connected mode could be resolved using the above approaches, their operation in island mode would require simulating local generation droop controllers for sharing the complex power load and network loss amongst the generators. This letter proposes a complex power compensation approach, which is based on Wirtinger calculus, for extending the applicability of practical distribution power flow methods to microgrids operating in island mode. Supporting numerical results are reported on microgrids with up to 3139 nodes.

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A simple and accurate approach to solve the power flow for balanced islanded microgrids

Cited by 36 publications

References 17 publications

Comprehensive Analysis of Planning Operation and Protection of Microgrid Systems

Comprehensive Analysis of Planning Operation and Protection of Microgrid Systems

Nature-inspired Hybrid Optimization Algorithms for Load Flow Analysis of Islanded Microgrids

Compensation in Complex Variables for Microgrid Power Flow

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