A first swing stability improvement approach in microgrids with synchronous distributed generators

Fayazi, Hassan; Moazzami, Majid; Fani, Bahador; Shahgholian, Ghazanfar

doi:10.1002/2050-7038.12816

Cited by 8 publications

(6 citation statements)

References 45 publications

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“…Te diferential load fow approach has shown that this method is efective in solving transient stability simulation [7,25]. Te researchers in [7] have further shown that the nonlinear AC power fow can be transformed into a set of equivalent linear equations that does not need any iteration.…”

Section: Overview Of Atc Available Transmission Capacitymentioning

confidence: 99%

An Effective Method to Determine the Available Transmission Capacity with Variable Frequency Transformer

Eidiani

Zeynal

2023

International Transactions on Electrical Energy Systems

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Available transmission capacity (ATC) is a top priority and lucrative solution for electricity market players. Fast and accurate ATC solutions enable participants to gain a competitive advantage in the marketplace. In order to procure a competitive solution, we propose the differential power flow equation-based static ATC. Using the proposed method, the entire time-domain trajectory of a dynamic system can be solved along with a differential equation based on a fictional time. In this paper, a variable frequency transformer (VFT) was used to control and increase the transmission power, which made the calculations more complex. In addition, the proposed method was used in seven different systems and 50% of the time was saved on small systems. It also enjoyed a much better performance (up to 90%) on large systems. It can be concluded that the proposed static ATC introduces promising results and is suitable for online applications.

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Section: Overview Of Atc Available Transmission Capacitymentioning

confidence: 99%

An Effective Method to Determine the Available Transmission Capacity with Variable Frequency Transformer

Eidiani

Zeynal

2023

International Transactions on Electrical Energy Systems

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“…Considering the nonlinearity of the model in (25) and the advantage of the direct optimization, the interior point method is introduced, which requires the frst-order and second-order gradient information of the objective function. By accumulating the TS of the objective function J to a, the frst-order gradient is obtained by (26), where NUM ste is the number of the simulation steps and S δ j (t m ),a is the TS of the power angle of the #j SG to a at the m th step.…”

Section: Multiparameter Coordinated Optimization Considering the Opti...mentioning

confidence: 99%

“…Considering that the frst-order gradient in (26) is not suitable for diference periods of multiple parameters, this paper proposes the extended frst-order gradient with the improved TS in ( 28) and (29).…”

Section: Multiparameter Coordinated Optimization Considering the Opti...mentioning

confidence: 99%

“…Te eigensensitivity model [23,24] based on the linearized system model at a given operating point is not suitable for large disturbances, followed by a dynamic process lasting for several seconds. Te trajectory sensitivity (TS) quantifes the relationship between the dynamic response and faults or large disturbances [25,26]. In [27], the optimization to the PSS is proposed with the trajectory sensitivity and the conjugate gradient method.…”

Section: Introductionmentioning

confidence: 99%

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Suppression to Angular Oscillation among Synchronous Generators by Optimizing Parameters and Set-Points of Synchronous Condenser and High-Voltage DC

Tao

et al. 2022

International Transactions on Electrical Energy Systems

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After losing one or two poles of the high-voltage DC (HVDC) line, power systems may experience angular oscillations among the synchronous generators (SGs), possibly followed by tripping of the SGs and blackouts of the loads. To suppress the oscillations, the difficulty lies in the optimization methods and the countermeasures. For the former, parameter optimization based on the eigen-analysis for a given scenario is not suitable for angular oscillation after a large disturbance lasting for several seconds or longer. For the latter, adjusting the active power of the SGs is effective but responds slowly. Adjusting the excitation system of the synchronous condensers (SCs) is seldom studied since the relation of the power angle with the reactive power is not clearly described. Adjusting the control parameters of the remaining HVDC has limited effect and is not enough. The set-points for the controller of the HVDC are adjusted to suppress the oscillation but are to be restored after the oscillation, which is different from optimization of the control parameters. In this paper, coordinated optimization of the control parameters and the set-points of the SC and the HVDC is proposed to suppress the angular oscillations among the SGs. At first, the relation of the reactive power of the SC with the power angles is validated to provide the basis for optimizing the control parameters and the set-points of the SC. Since the analytical expression between the power angle and the control parameters or the set-points related to the reactive power is not explicit and the optimization periods of different parameters are different, an improved analytical model of the trajectory sensitivity (TS) is proposed. Based on the indication indices, the control parameters and the set-points of the constant current controller and the excitation system to be optimized are decided. The gradients of the objective function are extended to derive a coordinated multiparameter optimization model to suppress the angular oscillation among the SGs. The numerical results validate the accuracy of the improved TS by comparing it with the perturbation method. The time-domain analysis in different scenarios shows that the angular oscillations in the AC/HVDC system are effectively suppressed with the proposed optimization model.

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“…There may be a chance of power swing following the fault in islanded microgrid with multiple synchronous-based DGs [40].…”

Section: Performance During Power Swingmentioning

confidence: 99%

Protection of converter dominated MV microgrid using changes in current's phase angle

Mohanty

Chen

Tuấn

2021

IET Generation Trans & Dist

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Converter interfaced distributed generations in a microgrid feed the modulated current of limited magnitude during fault conditions. The protection design and its operation are thus challenging due to limited fault current which is further reduced by Petersen coil grounding in medium-voltage (MV) level. This paper aims to address this challenge by developing a current-only directional relay algorithm for the protection of converter dominated MV microgrid with Petersen coil grounding. The relay's operating principle is based on the sign of the change in phase angle of the fault current with respect to the prefault which indicates the direction of fault. The negative and positive changes in current's phase angle determine the fault in forward and reverse direction, respectively. The tripping decision is derived by comparing the binary output of the relay at both ends of the line segment under protection. This requires a simple, flexible and low bandwidth communication channel. Both theoretical analyses and simulation studies have been performed on a typical distribution grid intended to be operated as microgrid. The proposed protection method is suitable for microgrid having the converters with and without reactive power support. Various operating conditions are evaluated, including bidirectional power flow, high resistance fault, different fault types, loading conditions and signals with noise.

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A first swing stability improvement approach in microgrids with synchronous distributed generators

Cited by 8 publications

References 45 publications

An Effective Method to Determine the Available Transmission Capacity with Variable Frequency Transformer

An Effective Method to Determine the Available Transmission Capacity with Variable Frequency Transformer

Suppression to Angular Oscillation among Synchronous Generators by Optimizing Parameters and Set-Points of Synchronous Condenser and High-Voltage DC

Protection of converter dominated MV microgrid using changes in current's phase angle

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