Islanded AC Microgrid Stability and Feasibility Analysis on V-P Control with Estimation at Constant Frequency

Tang, Xiuhui; Zhang, Daming

doi:10.1109/icpes47639.2019.9105595

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…This is similar to the stability analysis by using eigenvalue approach for the synchronous generators as described in [18,19]. The method proposed by the authors in [17] for the constant frequency method is suitable for the system with resistive loads and resistance dominant lines. This is not realistic for a practical autonomous microgrid.…”

Section: Introductionmentioning

confidence: 89%

“…In the autonomous microgrid operated by each method, stability analysis is indispensable for ensuring its safe operation. Therefore, it is necessary to build state-space equation for the microgrid system under study in order to work out the eigenvalues for stability analysis [12][13][14][15][16][17]. This is similar to the stability analysis by using eigenvalue approach for the synchronous generators as described in [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Stability Analysis of Autonomous Microgrid Operated at Constant-Frequency with the Consideration of Reactive Power Balance

Zhang,

Tang

2023

J Energ Power Technol

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Large-scale autonomous microgrids have potential application values as they can increase renewable energy penetration level without compromising the stability of the existing large power systems. Before their widespread implementation, critical issues like stability analysis etc need to be solved. This paper analyses the stability in an autonomous microgrid operated at constant frequency with the consideration of reactive power balance. Difference equations of reactive power for the grid-forming generator are constructed separately from those for the grid-supporting and grid-feeding generators while the difference equations of the real power for all the generators are the same. For the voltage source inverter with its current controlled by proportional resonant controller, at the fundamental frequency, its output current is disentangled from its terminal voltage and is controlled to trace its reference accurately, namely . Therefore, each inverter can be modelled as an equivalent current source and the equivalent circuits for d-component and q-component can be separated from each other. Then, the nodal equations in matrix form for the microgrid system can be established readily. With these, the system level state-space equations are built to study the distribution of eigenvalues. By choosing proper coefficients for real power and reactive power reference generations and controller’s parameters, one can make all the eigenvalues falling in the left-hand-side of the complex plane. Therefore, the system is stable. Such a research paves the way for systematically searching good sets of coefficients and controller’s parameters which make system operate safely away from unstable region with necessary margin.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Autonomous Microgrid Operated at Constant-Frequency with the Consideration of Reactive Power Balance

Zhang,

Tang

2023

J Energ Power Technol

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“…Power flow analysis is necessary to investigate the voltage profiles in a power system [22]. For this study, a differential evolution-based method is adopted to carry out the power flow analysis in the autonomous microgrid system in Figure 4b.…”

Section: Power Flow Analysis For the Autonomous Microgridmentioning

confidence: 99%

Modeling of Autonomous Microgrid Operated at Medium-Voltage Level and at Constant Frequency and Study of Its Voltage Profile

Zhang¹

2023

J Energ Power Technol

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To increase power level in an autonomous microgrid, higher voltage is necessary. In this paper, detailed Matlab/Simulink modeling of a microgrid operated at medium-voltage level and at constant frequency has been conducted. Modified boost converter and medium-frequency transformer isolated DC/DC converter are adopted for both solar energy and wind energy harnessing in order for them to be connected with the microgrid. This paper further adopted a differential evolution (DE)-based method to carry out load flow analysis to work out the voltage at each bus. Results obtained from the DE method are nearly the same at some nodes or buses as those from Matlab/Simulink platform-based time-domain fixed-step modeling, while at other nodes they are very close to each other. Then DE method can be used to carry out load flow analysis in more complex microgrids with more nodes to overcome the limited modelling capability of Matlab/Simulink and other tools. Moreover, this new research effort also paves the way for the stability analysis of large-scale microgrids.

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“…At the same time, it ensures the effective search of resonant frequency, the maximum weakening of the resonance peak at the frequency, the use of small damping elements, and also small energy loss. For high frequency band, the attenuation is dramatically restrained at the same time [24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Synthetical Optimal Design for Passive-Damped LCL Filters in Islanded AC Microgrid

Tang¹,

Zhang²,

Chai³

2021

JEPT

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In AC microgrid systems, technical issues resulting from the power control effect are the power control method efficiency and the filter resonance since voltage-frequency interference and filtering resonance may cause significant control input reduction and oscillation. A simple and robust solution is to regulate active power flow by adding an optimal passive damping resistor. The optimal LCL filter parameterization process in this paper provides an innovative approach to obtain the optimal quality factor and the optimal damping resistor. The amplitude responses of resonant frequency and high frequency are involved in the cost function. Simulations of various cases are conducted in MATLAB/Simulink. The key advantages of this procedure include flattened admittance peak, weakened high frequency decay, and less damping loss. Through the method in this paper, the optimal passive-damped filter parameters can be calculated in an efficient manner, while the power can be regulated and tracked in a simplified way, and the performance of the control strategy is improved.

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Islanded AC Microgrid Stability and Feasibility Analysis on V-P Control with Estimation at Constant Frequency

Cited by 7 publications

References 10 publications

Stability Analysis of Autonomous Microgrid Operated at Constant-Frequency with the Consideration of Reactive Power Balance

Stability Analysis of Autonomous Microgrid Operated at Constant-Frequency with the Consideration of Reactive Power Balance

Modeling of Autonomous Microgrid Operated at Medium-Voltage Level and at Constant Frequency and Study of Its Voltage Profile

Synthetical Optimal Design for Passive-Damped LCL Filters in Islanded AC Microgrid

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