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In this work, a decentralized PI passivity-based controller (PI-PBC) is applied to the Modular Multilevel Converters (MMCs) to ensure global asymptotic stability of a multiterminal MT-HVDC system. Since continuous MMC state-space models naturally have time-periodic steady-state solutions, a first step towards the derivation of the controller is the formulation of an equivalent model characterized...
Due to low inertia and constant power loads, stability is a major issue for dc distribution grids. Previous research focuses mostly on the (mathematical) analysis of the stability, but does not provide any guidelines to ensure stability. This paper presents four guidelines that ensure the existence of an appropriate equilibrium and stability around that equilibrium. From a linearized model of the...
This paper presents a Lyapunov-function based control approach with cascaded proportional-resonant (PR) controller for single-phase grid-tied LCL-filtered quasi-Z-source inverter (qZSI). The proposed control approach guarantees the global stability of the closed-loop system and zero steady-state error in the grid current. The reference values for the inverter current and capacitor voltage are generated...
Reactive power compensation devices are commonly adopted in power systems to improve voltage stability. The static synchronous compensator (STATCOM) can adjust the reactive power output quickly and smoothly, whilst the mechanically switched capacitor (MSC) is more widely applied due to its low cost. Therefore, in this paper, a new control method is proposed combining both their advantages to improve...
The unfolding-type flyback inverter operating in discontinuous conduction mode (DCM) is popular as a low-cost solution for a photovoltaic (PV) ac module application. This paper aims to improve the efficiency by using a scheme based on continuous conduction mode (CCM) for this application. Design issues, both for the power scheme and the control scheme, are identified and trade-offs investigated. An...
Decreasing stability of power system by voltage instability makes that all power system face with serious problems of stability. That is attributable to the difficulty of controlling the power system. So it is necessary to keep the voltage of load bus in range of the limited level to supply high quality of electric power. Therefore we describe and suggest on this paper that a plan for coordination...
This paper presents a method of enhancement of transmission capability limit using system damping resistor (SDR) and series - shunt capacitors (SC and ShC). The SDR is very effective for short distance transmission lines such as 50 km or so. The SDR is small in capacities for transmitted power and the durations of switching time are around 0.5 s. Experiments are carried out for the determination of...
Entergy has installed SVCs at two of its major load centers. Extensive voltage stability assessment was performed to understand any operational problems and to determine the most efficient size and location of the SVCs. This paper presents a brief summary of the planning aspect of one of the installations and provides details on one of the unique features of this SVC, which is coordinated control...
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