Abstract
Active power outputs of a wind farm connected to a weak power grid greatly affect the stability of grid-connected voltage source converter (VSC) systems. This paper studies the impact of active power outputs and control parameters on the subsynchronous oscillation characteristics of full-converter wind farms connected weak power grids. Eigenvalue and participation factor analysis was performed to identify the dominant oscillation modes of the system under consideration. The impact of active power output and control parameters on the damping characteristics of subsynchronous oscillation is analysed with the eigenvalue method. The analysis shows that when the phase-locked loop (PLL) proportional gain is high, the subsynchronous oscillation damping characteristics are worsened as the active power output increases. On the contrary, when the PLL proportional gain is small, the subsynchronous oscillation damping characteristics are improved as the active power output increases. By adjusting the control parameters in the PLL and DC link voltage controllers, system stability can be improved. Time-domain results verify the analysis and the findings.
Highlights
In recent years, as a clean, renewable and relatively proven technology, wind power generation has grown significantly in order to tackle the climate change and replace fossil fuels generators.By the end of 2019, the cumulative installed capacity of wind power worldwide reached 650 GW, of which 60.4 GW was newly added [1]
When the value of Kppll is large, the eigenvalues move toward the right half plane (RHP) with the increase of the active power output, the mode damping decreases, and the system stability decreases
The closer Kppll is to the critical value, the less the system stability is affected by the active power output
Summary
As a clean, renewable and relatively proven technology, wind power generation has grown significantly in order to tackle the climate change and replace fossil fuels generators. A doubly fed induction generator (DFIG)-based wind farm was integrated into the grids via a high-series compensation transmission line This caused a subsynchronous control interaction, resulting in a large number of wind turbine trips [3,4]. References [7,8,9] established DFIG-based wind farms interconnected with the grids and analysed the influence of the number of wind turbine generators (WTGs), wind speed, series compensation, line resistance, and outer and inner loop control parameters on subsynchronous interaction. The correlation between the active power output and the damping of the SSO mode with different control parameters is analysed through dynamic modelling and linear system analysis. The correlation between the active power output and damping the SSO calculation of participation factors are carried to study the impact of the active powerofoutput onmode is analysed with different between control parameters and output the critical that affect characteristics.
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