Adaptive Virtual Capacitor Control for MTDC System With Deloaded Wind Power Plants

Zhong, Cheng; Zhang, Jialong; Zhou, Yang

doi:10.1109/access.2020.3032284

Cited by 7 publications

(10 citation statements)

References 26 publications

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“…In reality, capacitor current is constrained by ESR. Therefore, in the design of CBs for power compensation applications, ESR must be considered to ensure the CB aligns with network requirements [12][13][14].…”

Section: Aproblem Background and The Current Research Gapmentioning

confidence: 99%

Reliability Calculation Improvement of Electrolytic Capacitor Banks Used in Energy Storage Applications Based on Internal Capacitor Faults and Degradation

Rezaei,

Fathollahi,

Akbari

et al. 2024

IEEE Access

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Capacitor banks (CBs) play a crucial role in energy storage and frequency control within autonomous microgrids. However, the impact of internal capacitor configurations, varying in terms of equivalent series resistance (ESR), capacitance, and rated voltage, on CB degradation, reliability, and peak current remains an understudied aspect. Moreover, the absence of a capacitance degradation coefficient in the standard MIL-HDBK-217 equations for predicting the reliability of electrolytic capacitors poses a significant challenge. To address these issues, this study examines a microgrid composed of diverse renewable energy systems, featuring nine distinct CB arrangements. The design of CBs considers both capacitance and peak output current individually. An evaluation is conducted to compare construction costs, lifetimes, and peak output currents across all layouts. Additionally, a novel formula is introduced to estimate the reliability and lifetime of CBs, while an existing formula for calculating CB peak output current is enhanced. The research explores the impact of ambient temperature and capacitor voltage on the reliability of various capacitor designs, proposing a novel framework for assessing CB reliability based on MIL-HDBK-338B, which accounts for both short-circuit and open-circuit faults. The practicality of these findings is confirmed through a comparison of experimental and simulation results. The inverter operation video, simulation, and all production data including PCB and processor codes are also attached. INDEX TERMSPower Electronics; Renewable Energy; Capacitor Bank; Degradation Modeling; ESR; Reliability Analysis. NOMENCLATURE A1-A6 Area (mm 2 ). Req,PCB PCB Equivalent resistor (Ω). C Capacitance (F). Rij ESR of capacitor in column i and row j of CB. Cini Initial capacitance (F). RpcbInterconnection resistor of the PCB between two capacitors.

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Section: Aproblem Background and The Current Research Gapmentioning

confidence: 99%

Reliability Calculation Improvement of Electrolytic Capacitor Banks Used in Energy Storage Applications Based on Internal Capacitor Faults and Degradation

Rezaei,

Fathollahi,

Akbari

et al. 2024

IEEE Access

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show abstract

“…Thus, the line and transformer equivalent impedances have only imaginary parts. Linear modal analysis is conducted by linearizing the nonlinear differential-algebraic equations of the power system given in ( 14) and (15). In small-signal stability analysis, the change in electrical power output following a perturbation can be resolved into two components, namely, synchronizing and damping power.…”

Section: Dynamic Modeling Of An Smib Withmentioning

confidence: 99%

“…This section describes how the modified Heffron-Phillips model is evaluated under the joint VIC-PLL effect for EMI λ c . To incorporate the effects of the WES, the power balance expressed in (15) can be augmented to:…”

Section: Dynamic Modeling Of An Smib Withmentioning

confidence: 99%

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Design of Power System Stabilizer for DFIG-based Wind Energy Integrated Power Systems Under Combined Influence of PLL and Virtual Inertia Controller

Sahu,

Prasad Padhy

2024

Journal of Modern Power Systems and Clean Energy

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Wind energy systems (WESs) based on doubly-fed induction generators (DFIGs) have enormous potential for meeting the future demands related to clean energy. Due to the low inertia and intermittency of power injection, a WES is equipped with a virtual inertial controller (VIC) to support the system during a frequency deviation event. The frequency deviation measured by a phase locked loop (PLL) installed on a point of common coupling (PCC) bus is the input signal to the VIC. However, a VIC with an improper inertial gain could deteriorate the damping of the power system, which may lead to instability. To address this issue, a mathematical formulation for calculating the synchronizing and damping torque coefficients of a WES-integrated single-machine infinite bus (SMIB) system while considering PLL and VIC dynamics is proposed in this paper. In addition, a power system stabilizer (PSS) is designed for wind energy integrated power systems to enhance electromechanical oscillation damping. A small-signal stability assessment is performed using the infinite bus connected to a synchronous generator of higher-order dynamics integrated with a VICequipped WES. Finally, the performance and robustness of the proposed PSS is demonstrated through time-domain simulation in SMIB and nine-bus test systems integrated with WES under several case studies.

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“…Compared to synchronous generators with the same capacity, the H dc is small. However, this value can be increased by increasing the capacitance of the DC link capacitor, but this increases the cost and short circuit level and reduces the dynamic characteristics of the DC bus [19].…”

Section: Virtual Capacitor Controlmentioning

confidence: 99%

A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

Azizi

CheshmehBeigi

Rouzbehi

2022

IET Generation Trans & Dist

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With increasing energy demand, the use of renewable energy resources is increasing. Renewable energy sources require power electronic converters to get integrated into power grids. Multi‐terminal high voltage direct current (MT‐HVDC) systems are a promising solution for their grid integration. Using droop‐based controller strategies in power converter stations of MT‐HVDC grid, in addition, to providing power‐sharing, can support the frequency of the connected AC grids. However, power changes lead to direct voltage deviations, thereby disrupting the stability of the MT‐HVDC system. Here, a new control structure for the droop controller of the voltage source converter (VSC) controller is proposed which is named modified droop controller (M‐Droop). This method, in addition to power‐sharing, uses an appropriate control action to provide the required voltage stability. Here, analytical studies of the modified control strategy are reported. Moreover, through a developed MATLAB Simulink platform, its performance is verified in the events of transients, consisting of fault, variable load, and change in power generation.

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Adaptive Virtual Capacitor Control for MTDC System With Deloaded Wind Power Plants

Cited by 7 publications

References 26 publications

Reliability Calculation Improvement of Electrolytic Capacitor Banks Used in Energy Storage Applications Based on Internal Capacitor Faults and Degradation

Reliability Calculation Improvement of Electrolytic Capacitor Banks Used in Energy Storage Applications Based on Internal Capacitor Faults and Degradation

Design of Power System Stabilizer for DFIG-based Wind Energy Integrated Power Systems Under Combined Influence of PLL and Virtual Inertia Controller

A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

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