North China Electric Power University

Jiaming Zhang

Jing Yan Ma

Min Zhang

Chen Liu

Zhenmiao Yang

The disclosure relates to a method, system and storage medium for suppressing sub/super-synchronous oscillation for direct-drive wind turbine based on energy compensation. The method comprises: real-time collecting the bus voltage and the node injection current, obtaining the transient energy of direct-drive wind turbine; collecting the dynamic angle of PLL when the variation rate of the transient energy is positive, calculating the compensation energy and the increments of fundamental-frequency voltage of several supplementary energy branches based on the bus voltage and the node injection current and the dynamic angle of PLL; with the compensation energy of supplementary branches reaching the maximum and the increment of fundamental-frequency voltage being the minimum as the objective, and with the frequency-domain characteristic and fundamental-frequency voltage characteristic of control links being satisfied as the constraints, determining the compensation coefficients of supplementary energy branches, and then enabling the supplementary energy branches.

Method, system and storage medium for suppressing sub/super-synchronous oscillation for direct-drive wind turbine based on energy compensation

The present disclosure is directed to a single-phase reclosing method, device and storage medium for AC/DC system. The method comprises: acquiring three-phase voltages at inverter-side AC bus close to the transformer, three-phase currents measured at the outlet of inverter-side AC line and three-phase voltages at inverter-side AC bus far from the transformer; calculating the energy calculation value and energy operation value of the fault line; identifying the fault nature of fault line within the maximum time delay, according to the energy calculation value and energy operation value of fault line and an energy criterion of transient/permanent fault; issuing a reclosing control signal based on the fault nature of fault line to realize effective reclosing of the fault line.

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Beijing, China

Jiaming Zhang