A Control Algorithm Based on the Conservative Power Theory for Cooperative Sharing of Imbalances in Four-Wire Systems

Burgos-Mellado, Claudio; Cárdenas, Roberto; Sáez, Doris; Costabeber, Alessandro; Sumner, Mark

doi:10.1109/tpel.2018.2869866

Cited by 31 publications

(41 citation statements)

References 30 publications

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“…The proposed small signal model is verified studying the eigenvalues of the transition matrix (45). The results are generated as follows: all the PLL designs shown in Table 2 are evaluated for each of the SCRs shown in Table 3.…”

Section: Comparison Between Model and Simulation Resultsmentioning

confidence: 99%

“…The control system and converter topology of Figure 3 has been implemented in a Triphase PM15F42C unit (5 kW) [43][44][45] (configured as a 3-leg converter) as is shown in Figure 9. This unit has the same output filter parameters as those given in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…This model is shown in (44) and the required operating point (E a 1do , E a 1qo , I a 1do , I a 1qo ) is discussed in Section 3.4. The model can be represented as shown in (45) in the Laplace domain. The stability of the system can be studied by analysing the eigenvalues of the transition matrix "A".…”

Section: Whole System Modelmentioning

confidence: 99%

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Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids

et al. 2019

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This paper proposes a low-complexity small signal model for a 3-leg converter connected to a balanced three-phase, three-wire weak grid and synchronised to this grid using a PLL implemented in a synchronous rotating d-q axis. A thorough analysis of the system stability as a function of the PLL bandwidth and the short circuit ratio (SCR) of the grid is performed based on a linearised model. By using the proposed model, an improved design process is proposed for the commonly used dq-PLL that accounts for the potential stability issues which may occur in weak grids. Using the proposed approach, it is possible to optimise the PLL design to find the fastest PLL that can operate stably considering the SCR of the grid. In addition, the proposed model is very simple, resulting in a straightforward design tool that could also be used for online stability monitoring. The method is validated through simulations and experimental results from a 5kW laboratory system.

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Section: Comparison Between Model and Simulation Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids

et al. 2019

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“…15 was used to implement a SAPF in Ref. [33,34,35] based on resonant controllers. In this case, in each phase, a PI controller and seven resonant controllers were implemented in a parallel topology.…”

Section: Discussionmentioning

confidence: 99%

Pareto-based modulated model predictive control strategy for power converter applications

Santis

Sáez

Cárdenas

et al. 2019

Electric Power Systems Research

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Modulated model predictive control (M 2 PC) allows fixed switching frequency operation of power converters, producing lower ripple and lower total harmonic distortion (THD) in the output signals than those obtained using regular model predictive control (MPC) algorithms. However, the design of the M 2 PC algorithm and its performance depend on, among other factors, the tuning of weighting factors, which are required by the cost functions typically used in predictive control algorithms. In this paper, a novel Pareto-based multi-objective M 2 PC (MO-M 2 PC) strategy is proposed. In this case, the use of weighting factors is not required, and the optimization problem is solved using a multi-objective approach. The aim of the proposed MOM 2 PC strategy is to consider practical rules, such as satisfaction of soft constraints, to calculate the control actions. The proposed Pareto-based MOM 2 PC strategy can be applied to any power converter topology. In this paper, experimental validation of the proposed methodology is pursued using a 3-phase 3 kW power converter operating as a shunt active power filter (SAPF). The proposed control is implemented in a control platform based on the dSPACE ds1103 system. The simulation and experimental results demonstrate the advantages and flexibility achieved by the proposed Pareto-based MOM 2 PC.

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“…The sharing of unbalanced currents is achieved by increasing the voltage imbalance at the output of the power converters [6] [7] [8]. The maximum unbalanced voltage allowed in the MG has to be regulated to avoid power quality issues as it is defined by the IEEE standard 1547-2018 [9].…”

Section: Introductionmentioning

confidence: 99%

Single-Phase Consensus-Based Control for Regulating Voltage and Sharing Unbalanced Currents in 3-Wire Isolated AC Microgrids

et al. 2020

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A distributed control strategy is proposed to share unbalanced currents in three-phase threewire isolated AC Microgrids (MGs). It is based on a novel approach where, rather than analysing the MG as a three-phase system, it is analysed as three single-phase subsystems. The proposal uses a modified singlephase − droop scheme where two additional secondary control actions are introduced per phase. The first control action performs voltage regulation, while the second one achieves the sharing of negative sequence current components between the 3-legs power converters located in the MG. These secondary control actions are calculated online using a consensus-based distributed control scheme to share negative sequence current components, voltage regulation, and regulating the imbalance at the converters' output voltage to meet the IEEE power quality standards. The proposed methodology has the following advantages over other distributed control solutions, such as those based on the symmetrical components or those based on the Conservative Power Theory: (i) it achieves sharing of unbalanced currents, inducing smaller imbalances in the converters' output voltages than those of other methods, and (ii) the sharing of the unbalanced currents is simultaneously realised in both the sequence domain and the a-b-c domain. The latter is difficult to achieve using other solutions, as will be demonstrated in this work. Extensive experimental validation of the proposed distributed approach is provided using a laboratory-scale 3-wire MG. INDEX TERMS Consensus algorithm, Distributed control, Microgrids, Unbalanced currents sharing.

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A Control Algorithm Based on the Conservative Power Theory for Cooperative Sharing of Imbalances in Four-Wire Systems

Cited by 31 publications

References 30 publications

Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids

Small-Signal Modelling and Stability Assessment of Phase-Locked Loops in Weak Grids

Pareto-based modulated model predictive control strategy for power converter applications

Single-Phase Consensus-Based Control for Regulating Voltage and Sharing Unbalanced Currents in 3-Wire Isolated AC Microgrids

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