The Impact of High Voltage Direct Current Inverter Side on Subsynchronous Oscillation and Robust Control Design
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Based on complex torque coefficient method and eigenvalue analysis, the subsynchronous oscillation(SSO) damping characteristics of an AC/DC parallel system were studied.The result shows that both AC bus strength and the control mode of inverter side have a remarkable effect on SSO damping. H_∞ robust control theory was used to design a supplementary subsynchronous damping controller (SSDC), the variation of system magnitude-frequency characteristics caused by the variation of inverter AC short-circuit impedance and the change of inverter control modes are considered as the uncertainty of system model, and the design of SSDC can be converted to a problem of mixed sensitivity in H_∞ robust control theory. The eigenvalue analysis and time-domain simulation show that the proposed SSDC has good robust performance.