Node Flux-Linkage Synchronizing Control of Power Systems with 100 Power Generation Based on Capacitor Voltage Balancing Scheme
arxiv(2024)
摘要
This paper proposes a node flux-linkage synchronizing control method (NFSCM)
for power systems with 100
balancing scheme (CVBS). Different from the conventional grid-forming
controllers, NFSCM is designed to regulate inverters as virtual flux-linkage
sources. Auto-synchronization of flux-linkage vectors is achieved through the
CVBS-based NFSCM. The mismatch among the angular frequencies of flux-linkage
vectors is eliminated by regulating the tracking errors of DC-link voltages,
which establishes a negative feedback between the output frequency and active
power of the inverter. NFSCM is adaptive to weak and strong grids. It avoids
the excitation inrush currents in the step-up transformer of wind power
generators. It also eliminates the DC components of the three-phase currents,
and avoids low-frequency oscillations in active power. In order to limit the
short-circuit current of inverters, a logic-based bang-bang funnel control
(LBFC) is designed to control the switches of inverter bridges when
over-current is detected. LBFC is able to restrict various fault currents
within an acceptable range within the shortest time. LBFC and NFSCM are
designed to operate in a switched manner according to a state-dependent
switching strategy. Time-domain simulations were conducted on a 100
generation test system, and the performance of NFSCM and LBFC were
investigated.
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