Abstract
Nowadays with the improvement in the degree of emphasis on new energy, the wind power system has developed more and more rapidly over the world. Usually the wind plants are located in the remote areas which are far from the load centers. Generally series compensated AC transmission and high voltage DC transmission are made use of to improve the transmission capacity as two main effective ways which can solve the problem of large scale wind power transmission. The paper describes the three kinds of impact varieties and impact mechanisms in the sub-synchronous oscillation phenomena of wind power system based on doubly fed induction generator (DFIG) wind generators. At last, we point out the important problem that should be stressed in the wind power system.
Highlights
Sub-synchronous oscillation phenomenon in the thermal power system is in an abnormal state that the steam turbine unit is being under special operation state after disturbance, on the running condition, electrical system and steam turbine generator set are having significant energy exchange at one or more the synchronous frequency
The paper describes the three kinds of impact varieties and impact mechanisms in the sub-synchronous oscillation phenomena of wind power system based on doubly fed induction generator (DFIG) wind generators
Sub-synchronous oscillation in a wind farm in the form of three kinds of mechanism is discussed based on the current mainstream models doubly-fed induction generator (DFIG), and we pointed out that the current problems faced
Summary
Sub-synchronous oscillation phenomenon in the thermal power system is in an abnormal state that the steam turbine unit is being under special operation state after disturbance, on the running condition, electrical system and steam turbine generator set are having significant energy exchange at one or more the synchronous frequency. The year 1970 and 1971, there is a severe large-scale turbogenerator rotor shaft damage caused by transmission series compensation capacitor[1]. After this accident, people in academic and industry began to study sub-synchronous oscillation problem hotly, and achieved remarkable results in mechanism analysis method and the restraining method. Series compensation may induce sub-synchronous oscillation problem of wind turbine, affect the safe and stable operation of wind farms as well as the transmission system [2,3]. Sub-synchronous oscillation in a wind farm in the form of three kinds of mechanism is discussed based on the current mainstream models doubly-fed induction generator (DFIG), and we pointed out that the current problems faced now. In addition to possible sub-synchronous resonance (SSR) and sub-synchronous torsional interactions (SSTI), wind turbines converter internal control may cause subsynchronous oscillation problem (SSCI). [4]
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