However, not all operating scenarios present risk of SSO and require such a detailed investigation. The risk of unstable subsynchronous oscillations (SSO) in DFIG-based wind parks radially connected to transmission lines with series capacitive compensation is typically assessed with numerous electromagnetic transient (EMT) simulations, which is a time-consuming process. Finally, future research opportunities on new applications in wideband oscillation and power quality are highlighted. Also, the challenges in wideband phasor estimation and waveform data compression are discussed, and possible solutions are highlighted. Next, the measurements' applications on wideband oscillation identification, early warning, and mitigation, and other applications in power system operation are carefully introduced. Specifically, the synchronized wideband phasor measurement techniques and the synchronized waveform measurement techniques are first reviewed. Unlike existing review papers that concentrate on fundamental synchrophasor technology, this paper reviews the wideband monitoring technology. Wideband oscillation monitoring techniques have been emerging in recent years to identify and analyze these events. The effectiveness of the proposed pro-tection is verified with detailed electromagnetic simulations on a wind power system that had experienced actual SSCI incidents.ĭue to the interactions between the generators/power electronic devices and the grids, wideband oscillation events have occurred frequently in renewable power systems with frequencies from several Hz to several kHz.
The sensitivities are then used to determine the can-didate WFs and the number of WTGs to trip at those WFs, so as to stabilize the SSCI. These impedances are next collected by the CPC to calculate the sensitivities of tripping for each WF. Local DPRs measure the subsynchronous impedances of WFs in real time. The protection is composed of a central-ized protection coordinator (CPC) and several distributed pro-tection relays (DPRs). To fill the gap, this paper proposes a system-wide protection against unstable SSCI in wind power systems with fixed series compensations (FSCs). However, very little research has been done on the protection. Many studies have been conducted on their analysis and control. Unstable subsynchronous control interaction (SSCI) between wind farms (WFs) and series-compensated grid has posed a big threat to the safety of equipment and the stability of system.
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