Control of parallel connected inverters in standalone AC supply systems

Chandorkar, Mukul C.; Divan, Deepak; Adapa, R.

doi:10.1109/28.195899

Cited by 1,528 publications

(860 citation statements)

References 5 publications

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“…Since performance under droop control is satisfactory for large SG-based systems, this technique has been adapted to inverter-based grids [3,4,40,1].…”

Section: Introductionmentioning

confidence: 99%

Conditions for stability of droop-controlled inverter-based microgrids

Schiffer¹,

Ortega²,

Astolfi³

et al. 2014

Automatica

384

367

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We consider the problem of stability analysis for droop-controlled inverter-based microgrids with meshed topologies. The inverter models include variable frequencies as well as voltage amplitudes. Conditions on the tuning gains and setpoints for frequency and voltage stability, together with desired active power sharing, are derived in the paper. First, we prove that for all practical choices of these parameters global boundedness of trajectories is ensured. Subsequently, assuming the microgrid is lossless, a port-Hamiltonian description is derived, from which sufficient conditions for stability are given. Finally, we propose for generic lossy microgrids a design criterion for the controller gains and setpoints such that a desired steady-state active power distribution is achieved. The analysis is validated via simulation on a microgrid based on the CIGRE (Conseil International des Grands Réseaux Electriques) benchmark medium voltage distribution network.

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“…Since performance under droop control is satisfactory for large SG-based systems, this technique has been adapted to inverter-based grids [3,4,40,1].…”

Section: Introductionmentioning

confidence: 99%

Conditions for stability of droop-controlled inverter-based microgrids

Schiffer¹,

Ortega²,

Astolfi³

et al. 2014

Automatica

384

367

View full text Add to dashboard Cite

show abstract

“…In islanded microgrid, droop control is generally used to achieve proper power sharing between DG units 6 . With this control method, the DG's can meet the load requirements in a manner pre-determined by its voltage and frequency droop relations.…”

Section: Generalized Droop Controlmentioning

confidence: 99%

“…The "plug and play" feature can be realized using communication/noncommunication based control techniques. Among them, a popular non-communication based technique is the frequency and voltage droop control 6 . In Refs.…”

Section: Introductionmentioning

confidence: 99%

Artificial Neural Network Based Droop-Control Technique for Accurate Power Sharing in an Islanded Microgrid

Vigneysh¹,

Kumarappan²

2016

IJCIS

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In an islanded microgrid, while considering the complex nature of line impedance, the generalized droop control fails to share the actual real/reactive power between the distributed generation (DG) units. To overcome this power sharing issue, in this paper a new approach based on feed forward neural network (FFNN) is proposed. Also, the proposed FFNN based droop control method simultaneously controls the microgrid voltage and frequency within the limits. The proposed microgrid consists of combination of photovoltaic (PV) system and battery energy storage system (BESS) as the first DG unit and solid oxide fuel cell (SOFC) as the second DG unit. The simulation of the proposed microgrid is carried out in Matlab/Simulink environment and necessary results are compared to show the effectiveness of the proposed method.

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“…Through droop control, emulating synchronous generators, sharing powers between inverter-based DGs was firstly proposed [6]. Droop control schemes with many advantages such as flexibility, redundancy, and expandability can be categorized for four main groups: (1) conventional and variants of the droop control [6,13]; (2) virtual framework structure-based method [14,15]; (3) "construct and compensate" based methods [16,17]; and (4) the hybrid droop/signal injection method [18,19]. The details and characters of various control schemes were illustrated in [5].…”

Section: Introductionmentioning

confidence: 99%

“…To operate a microgrid at the distribution level, constant impedance loads (CILs) and constant power loads (CPLs) are connected with DGs [2][3][4][5][6][7][8][9][10][11][12][13][14]. For inverter-based microgrids, stability analysis is one of the most important concerns [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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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Control of parallel connected inverters in standalone AC supply systems

Cited by 1,528 publications

References 5 publications

Conditions for stability of droop-controlled inverter-based microgrids

Conditions for stability of droop-controlled inverter-based microgrids

Artificial Neural Network Based Droop-Control Technique for Accurate Power Sharing in an Islanded Microgrid

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

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