Abstract
Large-scale photovoltaic (PV) power plant has witnessed a dramatic increase in the integration into transmission and distribution network, manifesting subsynchronous control interaction (SSCI) when the host grid is weak. In this work, the oscillation modes of a typical PV network are analyzed, and a faster-than-real-time (FTRT) emulation is proposed for predicting the SSCI and consequently mitigating its impacts on AC grid by taking the effective active/reactive power control action. The electromagnetic transient (EMT) simulation is utilized to model the PV panels and converter stations to reflect the actual dynamic process. Meanwhile, the AC grid undergoes transient stability (TS) simulation to obtain a high speed up over real-time, and consequently, a power-voltage interface is adopted for the coexistence of different simulation methods. The reconfigurability and parallelism of the field-programmable gate arrays (FPGAs) enable the EMT-TS co-emulation strategy to run concurrently. With a remarkable 122 FTRT ratio, the proposed hardware emulation can provide an effective solution before the SSCI causes serious disruption following its detection. The hardware emulation results are validated by the off-line simulation tool Matlab/Simulink® and TSAT® in the DSATools™ suite.
Highlights
D UE to enhanced environmental standards, worldwide renewable energy installation has witnessed a dramatic increase
The integrated AC/DC grid with PV farm is given in Fig. 7, where the four-terminal (4-T) HVDC system is connected with IEEE 39-bus system at Bus 20 and Bus 39 for delivering extra active or reactive power to the AC grid, while the PV farm with a capacity of 400 M W is connected directly to the AC grid at Bus 39 through a long transmission line, which is represented as the blue circle in Fig. 7 (a)
FTRT EMULATION RESULTS AND VALIDATION The subsynchronous oscillation and its mitigation strategy are emulated in the FTRT platform, and the results are validated by the Matlab/Simulink® and the off-line transient stability simulation tool TSAT® in the DSAToolsTM suite
Summary
D UE to enhanced environmental standards, worldwide renewable energy installation has witnessed a dramatic increase. Traditional SSR mitigation strategies can be classified as: 1) Apply bypass filter [19]; 2) Trip the oscillating lines [20]; 3) Utilize flexible AC transmission systems (FACTS) devices, such as static var compensator (SVC) [21], [22], static synchronous compensator (STATCOM) [23], [24], unified power flow controller (UPFC) [25], and gate-controlled series capacitor (GCSC) [26], [27]; 4) Add a supplementary damping controller in either rotor-side converter (RSC) or grid-side converter (GSC) control loops [28], [29]. The utilization of FACTS devices or converter-based damping controllers is not an economical solution to mitigate the SSCI in the real-world.
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