Modeling, Analysis, and Design of Stationary-Reference-Frame Droop-Controlled Parallel Three-Phase Voltage Source Inverters

Vasquez, Juan C.; Guerrero, Josep M.; Savaghebi, Mehdi; Eloy-García, Joaquin; Teodorescu, Remus

doi:10.1109/tie.2012.2194951

Cited by 593 publications

(282 citation statements)

References 22 publications

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“…In addition, a feedforward loop is included in order to take the small variations of dc link voltage (V dc ) into account. Details about droop controllers and voltage/current loops can be found in [9] and [11].…”

Section: Proposed Control Structurementioning

confidence: 99%

“…2 is to enhance the performance of droop controllers and to make the system more damped [6], [11]. The resistive part of resistivecapacitive sub-blocks can be included to improve the sharing of fundamental negative sequence and harmonic components of load current among inverters.…”

Section: B Adaptive Virtual Impedance Schemementioning

confidence: 99%

“…The test system parameters are listed in Table I. The details of designing primary and secondary controllers have been provided in [9] and [11].…”

Section: B Adaptive Virtual Impedance Schemementioning

confidence: 99%

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Adaptive virtual impedance scheme for selective compensation of voltage unbalance and harmonics in microgrids

Savaghebi

Shafiee

Vasquez

et al. 2015

2015 IEEE Power &Amp; Energy Society General Meeting

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Abstract-This paper presents a two-level hierarchical control approach for voltage source inverters used to interface Distributed Generators (DGs) in microgrid applications. The control structure comprises primary and secondary levels. The primary level is a local controller, which consists of voltage and current inner control loops in order to fix the filter capacitor voltage and a virtual impedance loop mainly for voltage harmonics and unbalance compensation. The virtual impedance is set by the central secondary controller to mitigate the voltage distortion at sensitive load bus (SLB). Secondary controller is connected to a measurement unit to obtain the data of voltage harmonics and unbalance at microgrid SLB and broadcasts the commands for adjusting the virtual impedance of each unit. A general case with a combined voltage harmonic and unbalance distortion is considered. In such a case, voltage distortion is mitigated by selective insertion of capacitive virtual impedances for negative sequence of fundamental component as well as positive and negative sequences of main harmonics. The values of virtual capacitances are determined based on the required voltage quality at the load bus; thus, this scheme is titled as adaptive virtual impedance. Experimental results are presented to demonstrate the effectiveness of the proposed control approach.

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Section: Proposed Control Structurementioning

confidence: 99%

Section: B Adaptive Virtual Impedance Schemementioning

confidence: 99%

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Adaptive virtual impedance scheme for selective compensation of voltage unbalance and harmonics in microgrids

Savaghebi

Shafiee

Vasquez

et al. 2015

2015 IEEE Power &Amp; Energy Society General Meeting

Self Cite

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“…Because the outputs of the PV and the battery are limited, it is not allowed that all ac and dc loads are connected. Fortunately, most residential electric appliances are re-schedulable [6].…”

Section: Fig1 Bess Structurementioning

confidence: 99%

Uninterrupted Supply and Frequency Support for Local Load in Microgrid by Battery Energy Storage System (BESS)

Aravindan¹,

G.Subbulakshmi²

2015

IJAREEIE

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Renewable energy is the most economic solution for new grid-connected capacity in areas with good resources. The RES power variation and their unpredictable nature may decrease the grids reliability. In this regard, this paper presents an enhanced control method for battery energy storage systems (BESS) to support the frequency of MG and with the ability of disconnecting from the MG to supplying in the island mode a local consumer. The combination of Battery Energy Storage Systems (BESS) with a hierarchical control of the resources provides a solution to overcome the frequency control issues within an MG. Within the BESS, a power electronics converter interfaces the energy storage unit with a single or three-phase MG. The power converters operation in two states, namely MG-tied or islanded, is an important feature to improve the MG flexibility and feasibility. The BESS may also provide voltage support in the point of common coupling with the MG. The proposed BESS may compensate the power absorbed by the local loads in order to improve the MG frequency response. When the MG power quality worsens under a certain stage, in terms of voltage and frequency, the BESS detaches from the MG and continues to operate islanded. The reconnection is accomplished a smoothly resynchronization of the local voltage with the MG, without troubling the local loads supply. In this proposed method, by proper maintenance of charging and discharging of battery, it enhances the lifetime of battery and it also provides the uninterrupted supply of load.

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“…The inverter-interfaced DGs have much smaller inertia than a synchronous generator in traditional ac grid and the RES are intermittent, which makes the frequency of an islanded MG at the risk of instability. The droop control methods, which increase virtual inertia of inverter-interfaced DGs by mimicking the governor of a synchronous generator, are widely used as the primary control [2,[4][5][6][7] of an MG. The variability of renewable power sources are compensated by droop-controlled DGs or super capacitor storage systems.…”

Section: Introductionmentioning

confidence: 99%

Agent‐based distributed and economic automatic generation control for droop‐controlled AC microgrids

Zang

Zeng

et al. 2016

IET Generation, Transmission & Distribution

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Microgrids (MGs) are presented as a cornerstone of smart grid, which can integrate renewable energy sources environmentally, friendly, and reliably. Hierarchical control strategies, i.e. primary droop control, second automatic generation control (AGC), and tertiary economic dispatch (ED), are widely used to control and optimise an MG. However, the gap between large time-scale ED and small time-scale AGC may decrease the economical efficiency of an MG. To address this problem, this study proposes a distributed economic AGC (EAGC) algorithm. The algorithm is fully distributed, as each distributed generator is assigned with an agent and the agents only require the local measurements and communication with its neighbours. Compared with centralised algorithms, the distributed control algorithm is easy to fulfil the plug-and-play requirements and reduces costs to modify the architecture of an MG. Furthermore, the proposed EAGC algorithm is suitable for all possible operation modes of an MG, i.e. islanded mode, grid-connected mode, and transition mode. To improve the robustness against agent loss or communication link fault, the topology of agents' communication network is designed to satisfy the N − 1 rule. The effectiveness of the proposed algorithm is demonstrated through the simulation tests which involve plenty of case studies.

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Modeling, Analysis, and Design of Stationary-Reference-Frame Droop-Controlled Parallel Three-Phase Voltage Source Inverters

Abstract: Modeling, analysis, and design of stationary reference frame droop controlled parallel three-phase voltage source inverters

Cited by 593 publications

References 22 publications

Adaptive virtual impedance scheme for selective compensation of voltage unbalance and harmonics in microgrids

Adaptive virtual impedance scheme for selective compensation of voltage unbalance and harmonics in microgrids

Uninterrupted Supply and Frequency Support for Local Load in Microgrid by Battery Energy Storage System (BESS)

Agent‐based distributed and economic automatic generation control for droop‐controlled AC microgrids

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