A New Droop Control Method for the Autonomous Operation of Distributed Energy Resource Interface Converters

Lee, Chia-Tse; Chu, Chia-Chi; Cheng, Po-Tai

doi:10.1109/tpel.2012.2205944

Cited by 346 publications

(52 citation statements)

References 20 publications

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“…This study presents a simple method in Equations (31), (35) and (36) to guarantee accurate reactive power sharing based on the known line resistance. There are also some other measures to improve the reactive power sharing, such as adaptive voltage droop control [34,35], synchronized reactive power compensation [36],  Q V droop control [37], droop control based synchronized operation [38], virtual impedance method [39,40], and hierarchical droop control [41]. Then, the In Figure 4, once the virtual resistance takes effect, the equivalent reference resistance of DG units will become matched to each other as in Equation (36).…”

Section: Steady State Analysismentioning

confidence: 99%

“…There are also some other measures to improve the reactive power sharing, such as adaptive voltage droop control [34,35], synchronized reactive power compensation [36], Q-. V droop control [37], droop control based synchronized operation [38], virtual impedance method [39,40], and hierarchical droop control [41]. Then, the methods in [34][35][36][37][38][39][40][41] can also be extended to the resistive lines of low voltage microgrid.…”

Section: Steady State Analysismentioning

confidence: 99%

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Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

et al. 2016

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Abstract:In low-voltage converter-based alternating current (AC) microgrids with resistive distribution lines, the P-V droop with Q-f boost (VPD/FQB) is the most common method for load sharing. However, it cannot achieve the active power sharing proportionally. To overcome this drawback, the conventional P-ω/Q-V droop control is adopted in the low-voltage AC microgrid. As a result, the active power sharing among the distributed generators (DGs) is easily obtained without communication. More importantly, this study clears up the previous misunderstanding that conventional P-ω/Q-V droop control is only applicable to microgrids with highly inductive lines, and lays a foundation for the application of conventional droop control under different line impedances. Moreover, in order to guarantee the accurate reactive power sharing, a guide for designing Q-V droop gains is given, and virtual resistance is adopted to shape the desired output impedance. Finally, the effects of power sharing and transient response are verified through simulations and experiments in converter-based AC Microgrid.

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Section: Steady State Analysismentioning

confidence: 99%

Section: Steady State Analysismentioning

confidence: 99%

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

et al. 2016

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“…It has historically been applied to control paralleled synchronous generators in a conventional power system [28,29]. In MGs, the droop control schemes are used to control multiple DGs for proportional power sharing [30][31][32][33]. However, the economic operation of MGs is usually not guaranteed under the traditional droop scheme.…”

Section: Introductionmentioning

confidence: 99%

A Novel Decentralized Economic Operation in Islanded AC Microgrids

Han

Wang

et al. 2017

Energies

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Droop schemes are usually applied to the control of distributed generators (DGs) in microgrids (MGs) to realize proportional power sharing. The objective might, however, not suit MGs well for economic reasons. Addressing that issue, this paper proposes an alternative droop scheme for reducing the total active generation costs (TAGC). Optimal economic operation, DGs' capacity limitations and system stability are fully considered basing on DGs' generation costs. The proposed scheme utilizes the frequency as a carrier to realize the decentralized economic operation of MGs without communication links. Moreover, a fitting method is applied to balance DGs' synchronous operation and economy. The effectiveness and performance of the proposed scheme are verified through simulations and experiments.

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“…With the help of droop control active power sharing can be achieved among these DGs units. However, reactive power sharing is highly dependent on a DG unit's output filter and feeder impedances [11,[14][15][16]. The identical feeder impedance could be unequal as various DG units and load are located at different distances to each other.…”

mentioning

confidence: 99%

An Improved Control Strategy for Three-Phase Power Inverters in Islanded AC Microgrids

Khan

Huawei

et al. 2018

Inventions

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Microgrids (MGs) are composed of multiple distributed generators (DGs) interfaced to micronetwork through paralleled connected power inverters (PIs). Load sharing among multiple DG units is an important task for autonomous operation of microgrids. In order to realize satisfactory power sharing and voltage regulation between DG units, different voltage droop control strategies have been reported in the literature. In the medium voltage (MV) microgrids, power sharing, and voltage regulation often deteriorate due to dependence on nontrivial feeder impedances. The conventional control strategies are subject to steady-state active and reactive power-sharing errors along with system voltage and frequency deviations. Furthermore, complex microgrid configurations either in looped or meshed networks often make power balancing and voltage regulations more challenging. This paper presents an improved control strategy that can be extended for radial networks in order to enhance the accuracy of power sharing and voltage regulation. The proposed control strategy considers load voltage magnitude regulation as opposed the voltage regulation at inverters terminals. At the same time, a supervisory control loop is added to observe and correct system frequency deviations. This proposed method is aimed at replacing paralleled inverter control methods hitherto used. Simulation studies of the proposed scheme in comparison with the conventional control strategy in MATLAB/Simulink validate the effectiveness of the proposed strategy.Inventions 2018, 3, 47 2 of 14 mode, the distributed power inverters interfaces (DPIs) between load and microsource are governed by the droop control algorithm, which are responsible for the voltage regulation and power sharing in accordance with their ratings and corresponding energy source power. Hence, the control of paralleled connected power inverters has been investigated in recent years [11][12][13].Conventionally, the frequency and voltage magnitude droop are used as decentralized control schemes among DG units [11,12]. It can be seen as primary control of a synchronous machine. With the help of droop control active power sharing can be achieved among these DGs units. However, reactive power sharing is highly dependent on a DG unit's output filter and feeder impedances [11,[14][15][16]. The identical feeder impedance could be unequal as various DG units and load are located at different distances to each other. The unequal LCL-filter's impedance among various DGs units are due to different design considerations and system conditions [15]. In addition, configuration of microgrid network and existence of local loads often aggravate the power balancing problem. Therefore, power sharing of conventional droop control can be affected by mismatch of feeder impedances and make islanded microgrids less flexible and reliable [11,15].To solve the power control issue, a considerable number of control schemes based on droop concept have been proposed, which are classified into four main categories: (1) virtual fram...

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A New Droop Control Method for the Autonomous Operation of Distributed Energy Resource Interface Converters

Cited by 346 publications

References 20 publications

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

Conventional P-ω/Q-V Droop Control in Highly Resistive Line of Low-Voltage Converter-Based AC Microgrid

A Novel Decentralized Economic Operation in Islanded AC Microgrids

An Improved Control Strategy for Three-Phase Power Inverters in Islanded AC Microgrids

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