CAJ | 학술논문

针对含双馈机组风电场通过串联补偿外送功率时产生的次同步振荡(sub-synchronous oscillations，SSO)问题，建立了包含两质量块轴系、d-q解耦控制回路等的详细模型。采用测试信号法绘制分析阻尼曲线。该曲线显示，串联补偿的加入改变了电气阻尼特性。如果控制器参数不合理，较低串补度下也有发生振荡的风险；随着串补度的加大，电气谐振点的负阻尼越大，对应于转子侧的电气谐振频率越低。当轴系参数耦合时会发生轴系扭振。针对双馈机组转子变换器控制回路的特点，在转子侧注入次同步电流，以激发次同步电磁转矩阻尼振荡，设计附加功率控制的次同步阻尼控制器(sub-synchronous damping controller，SSDC)对次同步振荡予以抑制，并给出了控制器参数的整定方法。时域仿真结果表明：采用该 SSDC 方案，能够有效抑制串补引发的风电场SSO问题。
침대함쌍궤궤조풍전장통과천련보상외송공솔시산생적차동보진탕(sub-synchronous oscillations，SSO)문제，건립료포함량질량괴축계、d-q해우공제회로등적상세모형。채용측시신호법회제분석조니곡선。해곡선현시，천련보상적가입개변료전기조니특성。여과공제기삼수불합리，교저천보도하야유발생진탕적풍험；수착천보도적가대，전기해진점적부조니월대，대응우전자측적전기해진빈솔월저。당축계삼수우합시회발생축계뉴진。침대쌍궤궤조전자변환기공제회로적특점，재전자측주입차동보전류，이격발차동보전자전구조니진탕，설계부가공솔공제적차동보조니공제기(sub-synchronous damping controller，SSDC)대차동보진탕여이억제，병급출료공제기삼수적정정방법。시역방진결과표명：채용해 SSDC 방안，능구유효억제천보인발적풍전장SSO문제。
In allusion to sub-synchronous oscillations (SSO) occurred in wind farm composed of doubly fed induction generators (DFIG) while the wind power is transmitted to power gird via the series compensation, a detailed wind farm model including two mass block shaftings and d-q decoupling control circuit is built. The damping curve is plotted by test signal method and analyzed. The damping curve shows that the addition of series compensation changes the electrical damping characteristics. When the parameters of the controller is not reasonable, there is the risk of occurrence of SSO under a lower series compensation degree; along with the increase of series compensation degree, the negative damping at electric resonance point increases, so the corresponding electric resonance frequency at the rotor side decreases. When the parameters of the shaftings are coupled, the torsional vibration of shaft system occurs. According to the features of the rotor converter control circuit of DFIG, the sub-synchronous current is injected in at rotor side to energize damping oscillation by sub-synchronous electromagnetic torque, meanwhile a sub-synchronous damping controller (SSDC) based on additional active power control is designed to suppress the SSO and the setting method of the parameter of the controller is given. Results of time-domain simulation show that using the designed SSDC the SSO in wind farm caused by series compensation can be effectively suppressed.