Fast-Slow-Scale Interaction Induced Parallel Resonance and its Suppression in Voltage Source Converters

Ma, Rui; Qiu, Qi; Kurths, Jürgen; Zhan, Meng

doi:10.1109/access.2021.3091510

Cited by 11 publications

(4 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These could be obtained by evaluating the nonlinear state-space model or conducting simulations, which were more accurate but more time-consuming. This subsection presents a simple algorithm to calculate the operating point condition based on the mathematical model and Figure 5, as shown in (3).…”

Section: Operating Point Calculation Of the Grid-connected Three-phas...mentioning

confidence: 99%

A Probabilistic Framework for the Robust Stability and Performance Analysis of Grid-Tied Voltage Source Converters

2022

View full text Add to dashboard Cite

This paper proposed a probabilistic framework that could be used for the sensitivity assessment of grid-connected voltage source converters (VSCs), where uncertainties in the grid short circuit ratio (SCR) and operating point conditions, as well as control-loop interactions, were considered. The proposed method tried to broaden the available knowledge on the small-signal stability analysis of VSCs and provide a probabilistic point of view of this subject. It considered the probability of different operational conditions in order to obtain less conservatism and more accurate results. Based on uncertain inputs and the employed stability model, the proposed model produced statistical distributions of the critical mode and its damping factor and ratio, which were not accessible by existing deterministic methods. Crucial statistical information measures how much system stability and performance are maintained or changed over the system uncertainties and disturbances, as well as provides a clear insight into the system stability problem. For instance, as concluded in this paper, for the conventional control system design, fast dynamic parts of a VSC, such as the current controller and control delay, significantly impact the minimum damping ratio. Furthermore, slow dynamic parts, such as outer voltage control loops and the synchronization block, influence the maximum damping factor. For strong grids, the AC voltage magnitude controller (AVC) significantly impacts the maximum damping factor due to its lower bandwidth among all control loops. For weak grids, the damping factor of the critical mode is highly affected by interactions between the VSC, the power grid, and different control loops due to the synchronization mechanism. The other contributions of this paper were the introduction of robust stability and performance definitions and indices; explanations of the pros and cons of probabilistic assessment methods and their applicability; interpretation of the obtained results; and, finally, a link was provided between system stability and reliability, which will be crucial for future power system design.

show abstract

Section: Operating Point Calculation Of the Grid-connected Three-phas...mentioning

confidence: 99%

A Probabilistic Framework for the Robust Stability and Performance Analysis of Grid-Tied Voltage Source Converters

2022

View full text Add to dashboard Cite

show abstract

“…The two-level, three-phase, three-leg (3P3L) BADC topology based on pulse width modulation (PWM) shown in Figure 2 has great scope in MG systems as it ensures BPT [19]. The voltage source converter (VSC), which is frequently used as a crucial PE component for MG systems, possesses the inherent nonlinear dynamics and multi-timescale interactions of its outer and inner controllers [20]. The structure of the VSC is straightforward and flexible for a wide input and output voltage range [21].…”

Section: Introductionmentioning

confidence: 99%

Voltage-Oriented Control-Based Three-Phase, Three-Leg Bidirectional AC–DC Converter with Improved Power Quality for Microgrids

Tasnim,

Ahmed,

Dorothi

et al. 2023

Energies

View full text Add to dashboard Cite

Renewable energy sources (RESs) and energy storage schemes (ESSs) integrated into a microgrid (MG) system have been widely used in power generation and distribution to provide a constant supply of electricity. The power electronics converters, particularly the bidirectional power converters (BPCs), are promising interfaces for MG infrastructure because they control the power management of the whole MG system. The controller of BPCs can be designed using several different control strategies. However, all the existing controllers have system stability, dynamics, and power quality issues. Therefore, this study demonstrates the development of an LCL-filtered grid-connected bidirectional AC–DC converter’s (BADC) control strategy based on voltage-oriented control (VOC) to overcome these issues. The proposed VOC-based inner current control loop (ICCL) is implemented in synchronous -coordinate with the help of proportional-integral (PI) controllers. An observer-based active damping (AD) is also developed in order to estimate the filter capacitor current from the capacitor voltage instead of directly measuring it. This developed AD system helps to damp the resonance effect of the LCL filter, improves system stability, and also eliminates the practical challenges of measuring capacitor current. The proposed controller with AD is able to realize bidirectional power transfer (BPT) with reduced power losses due to the elimination of passive damping and improved power quality, system dynamics, and stability. The mathematical modeling of the suggested system was developed, and the structure of the system model was established in the MATLAB/Simulink environment. The performance of the proposed system was validated with real-time software-in-the-loop (RT-SIL) simulation using the OPAL-RT simulator for a 16 kVA converter system. The real-time (RT) simulation results show that the BADC with the proposed control scheme can provide better dynamic performance and operate with tolerable total harmonic distortion (THD) of 2.62% and 2.71% for inverter and rectifier modes of operation, respectively.

show abstract

“…The traditional synchronous machines are being gradually replaced by power electronic devices. This great revolution in the source side has been substantially changing the dynamical performance of the power systems and bringing many new stability and oscillation problems [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Origin of anomalous instability of grid‐forming converters tied to stiff grid

Hong

Hou

et al. 2023

IET Renewable Power Gen

Self Cite

View full text Add to dashboard Cite

Grid‐forming (GFM) converter is believed to be highly promising in the future power systems, due to its ability of providing voltage and frequency support. However, some recent studies have shown that the GFM converter may suffer from instability in stiff grids, which seriously hampers its application. In this paper, the mechanism of this anomalous effect is studied by using the small‐signal stability analysis in detail. First, a detailed state‐space model of a single converter grid‐tied system is established from the first principle, and by using the participation factor analysis, the interaction between the terminal voltage loop and the power synchronization loop is identified as the major cause for the system instability. Then relying on a reduced‐order model containing only these two controls and using two classical analytical methods including the Routh criterion analysis and the Phillips– Heffron model of complex torque analysis, the origin of this anomalous instability of GFM converters tied to stiff grid coming from the negative damping provided by the terminal voltage loop is well uncovered and the critical grid strength is well predicted. In addition, these results may provide ideas for subsequent control optimization and stability improvement of GFM converters under various situations.

show abstract

Fast-Slow-Scale Interaction Induced Parallel Resonance and its Suppression in Voltage Source Converters

Cited by 11 publications

References 38 publications

A Probabilistic Framework for the Robust Stability and Performance Analysis of Grid-Tied Voltage Source Converters

A Probabilistic Framework for the Robust Stability and Performance Analysis of Grid-Tied Voltage Source Converters

Voltage-Oriented Control-Based Three-Phase, Three-Leg Bidirectional AC–DC Converter with Improved Power Quality for Microgrids

Origin of anomalous instability of grid‐forming converters tied to stiff grid

Contact Info

Product

Resources

About