SMALL DISTURBANCE STABILITY CONSTRAINED OPTIMAL POWER FLOW ALGORITHM OF PHOTOVOLTAIC GRID-CONNECTED POWER SYSTEMS WITH VIRTUAL SYNCHRONOUS GENERATOR
To improve the stability of the photovoltaic(PV)grid-connected power systems with virtual synchronous generator(VSG),and the weakly damped modes and the marginal stable modes are screened according to the eigenvalues and the damping ratios.The sensitivities of these critical modes with respect to the control parameters of the PV-SVG are derived.With the help of the Jacobian matrix of the power flow equations,the sensitivities of the critical modes with respect to the active power of the synchronous generator(SG)is proposed.With the objective function of the minimum adjustment to the control parameters and the SGs'active power,and the constraints of the criterion of the critical modes,the stability constrained optimal power flow(SC-OPF)algorithm for the PV-VSG integrated power systems is proposed.The numerical results confirm the effect of the optimized control on the critical modes,and verify the effectiveness of the proposed algorithm.
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