三相不平衡電網下雙饋感應發電機系統研製

Development of the DFIG system in the unbalanced three-phase grid

陳宗柏(Tsung-Po Chen)

雙饋感應發電機 ； 背對背換流器 ； 三相不平衡 ； DFIG ； back-to-back converter ； three-phase unbalance

亞東學報

36期（2016 / 12 / 31）

181 - 191

繁體中文

本文完成雙饋感應發電系統的轉子側雙頻率換流器正、負相序激磁電流控制，藉以控制雙饋感應發電定子正、負相序電壓與電流。本文提出的雙饋感應發電系統可以選擇不同的控制模式：‧三相平衡定子電壓輸出模式：在此控制模式之下，若匯流排電壓有不平衡，則定子輸出功率也將受外界影響而不平衡，不需要負相序電流控制系統。若定子輸出三相不平衡功率，發電機轉軸將會有轉矩漣波。‧三相平衡定子電流輸出模式：在此控制模式之下，將定子三相平衡電流電能饋入電網。‧匯流排負相序電流補償模式：以指定包含雙饋感應發電系統匯流排無負相序電流為標的，定子可以輸出三相不平衡電流、電壓，轉子電流也是三相不平衡，而受控匯流排饋線為三相平衡電流。本論文也提供實驗系統描述以及實驗結果，以驗證所提出控制方法的效能。

The doubly-fed induction generator systems transfer the main part of electric power to the three-phase ac lines via the stator, and do the control at the rotor. Via the back-to-back converter, the rotor-side-converter and the grid-side-converter with common dc link, connecting the rotor and the grid, the functions of back-to-back converter are controlling the stator complex power and transferring minor part of wind power. For unbalanced three-phase grid, the DFIG can be controlled for two different ways, fed power in balanced stator three-phase voltage, or fed power in balanced stator three-phase current. The consequences of previous two methods are the rippled torque and the unbalanced three-phase stator current, respectively. The rotor-side-converter feeds the exciting current to the rotor of DFIG, and thus to manipulate the stator current control. The control modes of the proposed control system are: ‧Three-phase balanced stator voltage mode, three-phase unbalance power may occur either the grid or load is unbalanced. ‧Three-phase balanced stator current mode, the three-phase stator currents are balanced, and the three-phase rotor currents are unbalanced. ‧Three-phase balanced bus current compensation mode, the DFIG will compensate the unbalance current of the load on the bus, and the total bus current is three-phase balanced. Both the three-phase stator currents and the three-phase rotor currents are unbalanced. Experimental results are provided to validate the performance of the proposed DFIG unbalanced control system.

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1. (2018)。雙饋感應發電機之諧波電流與不平衡電流整合控制系統研製。臺灣能源期刊，5(2)，97-111。