Identifying and Ranking Sources of SSR Based on the Concept of Subsynchronous Power

Abstract

This paper presents a measurement-based method for real-time determination of the wind farms or wind turbines that contribute most significantly to a subsynchronous resonance (SSR) event. The method is based on the concept of subsynchronous power (SSP). This paper has shown it is the SSP that drives the SSR. By monitoring the direction and amount of SSPs produced by different wind farms or turbines, the most critical wind farms or turbines can be identified and quantified. A dq0 transform based algorithm is developed to calculate the SSP in real time. The method overcomes the interference of fundamental frequency components and non-steady-state SSR components on the extraction of the SSP component. Several test cases have demonstrated the usefulness of the proposed concept and method.

Synchronized Waveforms – A Frontier of Data-Based Power System and Apparatus Monitoring, Protection, and Control

“…Another support evidence is to view an oscillation phenomenon as the presence of non-stationary interharmonics in the system. The direction of interharmonic power has been proposed to detect SSR-contributing DFIGs [32] and to trace sources causing voltage flicker [33].…”

Defining SSO Power and Characterizing SSO Propagation in Power System With Wind Farms Integration

“…Existing literature on the SSO propagation generally concentrates on i) studying the propagation mechanism of SSO [14], ii) defining the concept of subsynchronous power [15][16][17][18], iii) identifying the influencing elements of SSO propagation [19] and iv) determining the propagation path of SSO [20]. Gong Y et al find that the oscillating current propagates along the weakly damped channel in the synchronous generator-based system [14].…”

“…Gong Y et al find that the oscillating current propagates along the weakly damped channel in the synchronous generator-based system [14]. The concept of subsynchronous power using conventional power theory based on the average value is proposed in [15]. The defined subsynchronous power is applied to the real-time determination of wind farms contributing to SSO.…”

“…Because SSO has a great impact on the stable operation of wind integrated power systems, further research on SSO propagation mechanism is required. The concept of subsynchronous power proposed by [15] is applied to SSO source detection. This method is easy to implement and requires limited computational burden.…”

“…In SSO events, long-distance and cross-voltagelevel propagation of SSO is obviously beyond traditional cognition, which thinks SSO propagation is a local issue. Besides, oscillation propagation has been previously analyzed only in single oscillation frequency source systems [14][15][19][20]. The propagation mechanism of multiple oscillation sources considering the coupling effects of different frequency components has not yet been studied.…”