What causes low-frequency oscillations in electric power systems?
Malkova The development of electric power systems determines the growing probability of low-frequency oscillations, which can be reason of system faults. Traditionally, the task of damping low-frequency oscillations is assigned to synchronous generators, by appropriate setting of the automatic voltage regulator parameters.
Does positive feedback aggravate low-frequency oscillation induced by a control loop?
However, the potential positive feedback aggravates low-frequency oscillation induced by the interaction insides control loops, which is explained and solved in this paper. The multi-timescale impedance modelling framework is established to clarify stability mechanism of VIDC and the low-frequency oscillation of VIDC controlled DC-MG.
How can a low frequency oscillation be rapidly attenuated?
The root locus curve and simulation results illustrates that the ultra-low frequency oscillation can be rapidly attenuated by increasing the proportion parameter; the integral link can reduce the steady-state error; the differential link can improve the dynamic performance and damping characteristics of the system.
Can a photovoltaic station damp a power oscillation?
This paper presents an analysis of renewable energy plants, in particular photovoltaic stations, on damping of these power oscillations. Achieving such damping function is possible via upgrading the automatic control system of photovoltaic stations by using a synthetic inertia block and the possibilities of the “underload” mode.
What causes poor damping against voltage oscillation?
The potential instability factors, resulting in poor damping against voltage oscillation, are also revealed. Thus, dynamic stability enhancement method is further proposed to compensate for the negative damping caused by positive feedbacks of VIDC and CPL, and super-capacitor is added to alleviate rapid voltage changes.
Does LC impedance interact with voltage and inertia-loop?
The low-frequency oscillation (LC impedance interaction) in voltage- and inertia-loop is elaborated by RLC circuits of LVIs. The potential instability factors, resulting in poor damping against voltage oscillation, are also revealed.
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Analysis of low-frequency oscillation mechanism and …
Aiming at the low-frequency oscillation of bus voltage on the DC side of the two-stage power conversion system caused by modules cascading, this paper proposes an active …
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V dc is the dc bus voltage and is considered a constant in this paper. The control part consists of the power, voltage, and current loops. The low-pass filter (LPF) is used to attenuate the double-line-frequency ripple in the frequency and amplitude of …
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Virtual synchronous machine (VSM) based high voltage dc systems enhance the inertia of the power system. However, the dynamic interactions between the VSM-based rectifier station, the inverter station, and the grid could induce the system oscillation, which has been investigated in this article. At first, the hybrid ac–dc impedance models of the VSMs …
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Analysis and mitigation of low-frequency oscillations in hybrid AC/DC microgrids with dynamic loads. Authors: Moudud Ahmed ... ''Design and analysis of the droop control method for parallel inverters considering the impact of the complex impedance on the power sharing'', IEEE Trans. Ind. Electron., 2011, 58, (2), pp. 576–588.
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One such topology is the Differential Boost Inverter, proposed in [58], which involves connecting two DC-DC boost converters in parallel to the DC source and load, as shown in Fig. 10. Note that the output voltage of both converters is modulated with a 180 0 phase shift, generating a unipolar sinusoidal output voltage waveform.
Get Price →Low-Frequency Resonances in Grid-Forming Converters
Grid-forming voltage-source converter (GFM-VSC) may experience low-frequency resonances, such as synchronous resonance (SR) and subsynchronous resonance (SSR), in the output power. This article provides a comprehensive study on the low-frequency resonances with GFM-VSC systems and damping control methods. First, the causes of SR and SSR are discussed, …
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This paper proposes two novel power stabilizers for damping low-frequency oscillations (LFOs) in the power system. The first power stabilizer provides power oscillation damping through active power (POD-P), and it is implemented in a grid-forming converter, using the active power synchronization loop to damp system oscillations by acting on the ...
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The study is structured as follows: Section 2 analyses the low-frequency oscillation mechanism in VSG. The VPSS2A is studied in Section 3. The results and discussion are shown in Section 4. Section 5 provides the conclusion. 2 ANALYSIS OF THE LOW-FREQUENCY OSCILLATION MECHANISM IN VSG 2.1 Topology structure of VSG grid-connected system
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The issue of low-frequency oscillation (LFO) becomes more prominent when considering the phase-locked loop (PLL) impact of grid-connected inverter (GCI) under weak grid. ... (SVPWM) control section with high utilization of the dc bus, generates the drive signal to control the inverter. v dc is the dc-side voltage. L 1, C f, and L 2 denote the ...
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To date, scholars have proposed various low-frequency oscillation suppression methods for VSC-HVDC systems. One study [9] reported that energy drainage resistors can be integrated into wind farms through a VSC-HVDC system, which suppresses grid oscillations by applying different switching strategies. In another study [10], a linearized model of an AC/DC …
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The beat phenomenon is an important issue in the reduced DC-link capacitance motor drive system and other power electronic converters, including the resonant switching converter, the inverter with low switching frequency, the distributed power systems, and the matrix converter [1,2,3].The beat phenomenon is caused by the interaction of signals with different …
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This transformation from DC to AC is facilitated by inverters, an integral component of SPV systems. In the study, SPV system design is a comprehensive process that considers factors such as solar panel selection, site-specific conditions, inverter technology, safety measures, and sometimes battery storage to ensure a reliable and sustainable ...
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High penetration of renewable sources into conventional power systems results in reduction of system inertia and noticeable low-frequency oscillations (LFOs) in the rotor speed of synchronous generators. In this paper, we propose effective damping of LFOs by incorporating a supplementary damping controller with a photovoltaic (PV) generating station, where the …
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Similar to synchronous generators (SGs), the phenomenon of low-frequency oscillation (LFO) may occur when virtual synchronous generator (VSG) is involved in power grid, thereby negatively affecting the stability of the power system. In this paper, the oscillation mechanism of the power system composed of a VSG and infinite grid (single-VSG infinite-bus …
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For high-speed brushless DC (BLDC) drives, the influence of insufficient F ratio are primarily on two aspects: low-frequency current oscillations and the instability of sensorless operation.
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wind, and battery systems and inverter-based trans- mission, distribution, and load technologies—has led to oscillations with a wider range of characteristics and root causes. These raise new issues and risks for power system operation and planning, since oscillations can lead to unwanted equipment disconnections, supply
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In this paper it is proposed a new control-based strategy for clear the oscillations of the DC link voltage controller output, generating a harmonic free current reference signal, …
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In order to study the stability of high-penetration wind power connected to AC-DC hybrid power transmission system, the low-frequency oscillation analysis model of DFIG with inertia control connected to FLC AC-DC hybrid power transmission system is firstly established. Then, the influence of DFIG with inertia control on the inter-area oscillation mode of AC-DC hybrid …
Get Price →Impact of DC Voltage Reference on Subsynchronous …
Through theoretical analysis, it demonstrates that the use of nominal dc voltage introduces unique low-frequency dynamics, leading to a previously unreported kind of subsynchronous oscillation. These oscillations, rooted in the interaction between dc-side dynamics and grid-forming control, pose potential challenges for system stability.
Get Price →(PDF) Damping Low-Frequency Oscillations in Power
D amping of Low-Frequency Oscillations in Power Systems using Grid-Forming Converters 8 VOLUME XX, 20 21 For the baseline case, the electr omechanical mode is
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Based on further investigation of the ultra-low frequency oscillation phenomena in dc asynchronous networking with considerable hydropower, this paper analyzes the …
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In the low-voltage islanded multi-bus microgrid (LVIMB-MG), the virtual synchronous generators'' (VSGs'') inertia constant and damping coefficient play an important role in low-frequency oscillations (LFOs). However, existing LFO analyses lack the consideration of microgrids'' required rate of change of frequency (RoCoF) and steady-state active power-frequency (P-f) …
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To further improve the adaptive principle, both ac- and dc-side dynamics of VSG were considered jointly in [19] and smooth control parameters adaptive method was proposed for low-frequency oscillation damping in VSC-MTDC (VSC-based Multiterminal Direct Current) Systems. Shuai further explored the internal and external excitations for power ...
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Compared with the current source control strategy, the grid-connected inverter with voltage source control strategy has better stability at low grid strength and high new energy penetration rate and is less prone to wide-frequency oscillations, which is more suitable as the control strategy of grid-connected inverter in this scenario.
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The dc-link voltage dynamics can be directly used to synchronize grid-forming (GFM) converters with ac grids. However, such control scheme is prone to unstable low-frequency oscillations (LFO), owing to the constant-power dynamics at the dc link. This article analyzes first the small-signal stability of dc-link voltage-synchronized GFM converters, and proposes a control …
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The existing low-frequency oscillation analysis method of a multi-grid-forming-VSC (voltage source converter) is greatly affected by modeling accuracy, and its oscillation mode can only be determined by acquiring the control parameters of the system. Therefore, a method of identifying low-frequency oscillation characteristics of multi-VSC based on VMD (variational …
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The development of electric power systems determines the growing probability of low-frequency oscillations, which can be reason of system faults. Traditionally, the task of …
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Request PDF | Filter-based perturbation control of low-frequency oscillation in voltage-mode H-bridge DC–AC inverter | SUMMARY This paper presents a new additional perturbation control method ...
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This book presents the research and development results on power systems oscillations in three categories of analytical methods. First is damping torque analysis which was proposed in 1960''s, further developed …
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This article analyzes the low-frequency oscillations of dc-link voltage-synchronized VSCs, which is due to the impact of constant-power load/source (CPL/CPS) in the dc link. An …
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Benchmarking of the RCG based power control strategies are examined in terms of elimination of the power oscillations, reducing DC-link voltage oscillations, avoiding DC-side overvoltage and preventing AC-side overcurrent. Compared to the existing strategies, controlling reference active power is provided with a closed-loop control system.
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Inverter''s performance and operating mode may be negatively affected by inverter input (dc-link) current and voltage ripple. It is a common experience that even theoretically balanced loads with perfectly balanced supply voltages, such as multiphase ac motors supplied by pulse-width modulation (PWM) inverters, in practice show a certain degree of current …
Get Price →A low frequency oscillation suppression method for grid …
A low frequency oscillation suppression method for grid-connected DFIG with virtual inertia ... the frequency response characteristic of inverter control was improved by introducing virtual inertia to the voltage control link and current ... the time scale of the DC regulation within the DFIG converter is much smaller than the electromechanical ...
Get Price →Low-Frequency Oscillation Analysis of Virtual-Inertia-Controlled DC ...
Virtual inertia and damping control (VIDC) improves the stability of DC microgrid (DC-MG). However, the potential positive feedback aggravates low-frequency oscillation induced by the interaction insides control loops, which is explained and solved in this paper. The multi-timescale impedance modelling framework is established to clarify stability mechanism of VIDC and the …
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Abstract: Virtual inertia and damping control (VIDC) improves the stability of DC microgrid (DC-MG). However, the potential positive feedback aggravates low-frequency oscillation induced …
Get Price →Analysis and mitigation of low-frequency oscillations in hybrid AC/DC ...
Thus, a supplementary power oscillation damping (POD) controller is proposed in this paper for the ESS to damp low-frequency oscillations (LFOs) in the hybrid AC/DC …
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