Closed-loop stability-enhancing control of shunt FACTS devices using phasor measurements

Abstract

This paper addresses the problem of closed-loop stability-enhancing control of shunt FACTS devices. As the feedback signals, rotor angles and speed deviations of the generators have been used as supplied by a wide-area phasor measurement system. Control laws have been derived for nonlinear multi-machine system model using direct Lyapunov method with the aim to enforce the fastest possible decay of total system energy and therefore the fastest possible return to a steady-state equilibrium point. Validity and robustness of the proposed state-variable control has been confirmed by computer simulation for a multi-machine test system.

Multi-Objective Optimization of Back-to-Back Starting for Pumped Storage Plants under Low Water Head Conditions Based on the Refined Model

“…Since it is very difficult to gain an accurate value of the original parameters of the synchronous machine through analysis and calculation, 18 original parameters of a synchronous machine are usually converted into 11 machine parameters composed of steadystate, transient, and sub-transient parameters in engineering, which can be obtained directly through experiments. The mathematical model of a synchronous machine expressed by 11 machine parameters includes voltage balance equations of stator winding (8), excitation equations of stator winding (9), voltage balance equations of rotor winding (10), and a rotor motion Equation (11) [27].…”

Simulação de Transitórios Eletromecânicos e Análise da Estabilidade a Pequenas Perturbações através de ferramentas desenvolvidas em Python

“…A barra fictícia inserida no modelo é considerada ao montar a matriz admitância, e dessa forma, a equação matricial que relaciona correntes e tensões da rede pode ser vista em (15), em que 𝐸 representa o vetor de todas as fem´s sub-transitórias de todos os geradores, 𝑉 é a tensão nos nós em que não há injeção de corrente, 𝐼 é a corrente injetada nos nós de geração e 𝑌 , 𝑌 , 𝑌 e 𝑌 são submatrizes da matriz admitância. Para as simulações desenvolvidas nesse trabalho, as cargas são transformadas em admitâncias constantes, dessa forma, não há injeção de corrente nas barras de carga (Machowski et al, 2008).…”

Transient stability of induction generators in wind farm applications

“…Disturbances might be small and la dramatic are large disturbances such as sh tripping [3]. Availability of the dynamic determining the impact turbines will have o stability.…”