A new linear model for active loads in islanded inverter-based microgrids

Mahmoudi, Abdullah; Hosseinian, Seyed Hossein; Kosari, M.; Zarabadipour, Hassan

doi:10.1016/j.ijepes.2016.01.053

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…The problem constraints are the parameter bounds. Therefore, the design problem can be formulated as the following optimization problem (27) Subject to {K min ≤ K ≤ K max , m p min ≤ m p ≤ m p max , and n q min ≤ n q ≤ n q max } (28) where…”

Section: Objective Function and Problem Constraintsmentioning

confidence: 99%

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Optimal Design and Real Time Implementation of Autonomous Microgrid Including Active Load

2018

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Abstract:Controller gains and power-sharing parameters are the main parameters affect the dynamic performance of the microgrid. Considering an active load to the autonomous microgrid, the stability problem will be more involved. In this paper, the active load effect on microgrid dynamic stability is explored. An autonomous microgrid including three inverter-based distributed generations (DGs) with an active load is modeled and the associated controllers are designed. Controller gains of the inverters and active load as well as Phase Locked Loop (PLL) parameters are optimally tuned to guarantee overall system stability. A weighted objective function is proposed to minimize the error in both measured active power and DC voltage based on time-domain simulations. Different AC and DC disturbances are applied to verify and assess the effectiveness of the proposed control strategy. The results demonstrate the potential of the proposed controller to enhance the microgrid stability and to provide efficient damping characteristics. Additionally, the proposed controller is compared with the literature to demonstrate its superiority. Finally, the microgrid considered has been established and implemented on real time digital simulator (RTDS). The experimental results validate the simulation results and approve the effectiveness of the proposed controllers to enrich the stability of the considered microgrid.

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Section: Objective Function and Problem Constraintsmentioning

confidence: 99%

“…Moreover, the coupling effect and interactions between the PLL itself and the system impedance lead to a potential instability issue [25]. Therefore, studying microgrid stability considering CPLs is very important [26][27][28][29][30][31]. Large-signal study is used to explore the microgrid stability with CPL [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design and Real Time Implementation of Autonomous Microgrid Including Active Load

2018

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“…In [18][19][20], models for MG subsystems such as photovoltaic, micro-turbine and wind turbine resources, and ESS are introduced and utilised for control and energy management. A new linear state-space model for inverter-based MGs and active loads is proposed in [21] and then the model is corrected using a time-step simulation. A survey on modelling of MGs is given in [22].…”

Section: Introductionmentioning

confidence: 99%

Reduced‐order dynamic model for droop‐controlled inverter/converter‐based low‐voltage hybrid AC/DC microgrids – part 1: AC sub‐microgrid

Rasoolzadeh

Salmasi

2018

IET Smart Grid

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This study focuses on reduced-order dynamical modelling of droop-controlled inverter-based low-voltage AC submicrogrid in a hybrid AC/DC microgrid. The authors aim to develop a comprehensive reduced-order model for the low-voltage AC side in this part. The reduced-order models are preferred in real-time calculations. In hybrid microgrids, electrical power is exchanged between the AC and DC sub-microgrids by a bidirectional AC/DC converter. The distributed energy resources are connected to the main AC bus through power inverters. Voltage and frequency commands are generated by droop controllers for each inverter. For the main AC bus, equations describing voltage magnitude and frequency are derived. Steady-state values of the phase angles and injected power of the inverters are calculated. The overall non-linear dynamical and algebraic equations are derived for the low-voltage AC side, and then linearised around the operating point. To validate the developed model, a hybrid microgrid is implemented in PSCAD. Then, the proposed model for the case study is implemented in Matlab/ Simulink and the results are compared with PSCAD outputs. The comparative results show the validity of the developed comprehensive reduced-order model which can be used in fault detection approaches. P ex exchanging power from DC to the AC sub-microgrids at DC side K PF ratio of reactive power to active power for the main converter at AC side small signal variations of variables, inputs, outputs and disturbances steady-state values of variables, inputs, outputs and disturbances p = (d/dt) derivative operator

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