The traditional black-box Thevenin equivalent method cannot analyze the influence mechanism of wind power integration on parameters. With increase in penetration, it will be difficult to accurately assess voltage stability systems with power. Therefore, a analytical is proposed system This adopts model based current source model. It establishes for by dividing node types. Then, expressions para...

In this paper, new mathematical formulas for the computation of the apparent power, the active power, and the reactive power are given, together with equations for the power factor and the distortion factor. These formulas are applicable for all four operational states, in which electric power networks can be. The given results remain valid also in the difficult case of nonlinear AC generators ...

Battery energy storage management for electric vehicles (EV) and hybrid EV is the most critical and enabling technology since the dawn of electric vehicle commercialization. A battery system is a complex electrochemical phenomenon whose performance degrades with age and the existence of varying material design. Moreover, it is very tedious and computationally very complex to monitor and control...

In order to improve the estimation accuracy of battery state charge (SOC) based on equivalent circuit model, a lithium-ion SOC method adaptive forgetting factor least squares and unscented Kalman filtering is proposed. The Thevenin model established. Through simulated annealing optimization algorithm, adaptively changed in real-time according demand, realized by combining least-squares online i...

This paper studies the definition and calculation method of power grid strength in environment high-proportion nonsynchronous-machine sources, focusing on effect sources voltage support frequency strength. By dividing into four types, equivalent circuits each type under normal state fault are derived, respectively. Based Thevenin impedance connected device, is given, new meaning single-infeed s...

This article deals with circuit modeling of power systems and more particularly DC–AC converters used for controlling electric motors. The objective the model is to be able assess conducted emission currents at both inputs outputs fixed operating in order apply appropriate mitigation design rules, such as filtering. First, we propose a linear Thevenin block converter considering it five-port bl...

This paper presents an improved method for determining the contribution of harmonic distortion generated by utility and customer at the Point of Common Coupling (PCC) in a distorted power system. For this purpose, first the magnitude and phase of voltage and current at the PCC in each frequency are estimated by adaptive Kalman filter. Then the parameters of Thevenin equivalent circuits of load ...

This paper proposes an efficient approach for the computation of voltage stability margin (VSM) in a large-scale power grid. The objective is to accurately and rapidly determine the load power margin which corresponds to voltage collapse phenomena. The proposed approach is based on the impedance match-based technique and the model-based technique. It combines the Thevenin equivalent (TE) networ...

This paper presents the explicit electromagnetic transient model of a Doubly Fed Induction Generator (DFIG), that includes its coupling with the back-to-back converter, when the generator/converter set is connected to the wind farm’s Thevenin equivalent, as seen from DFIG’s terminals. Besides that, DFIG’s grid side converter control system is defined in detail, so that expressions for the direc...