CAJ | 학술논문

考虑风资源的随机性和所接入电网的结构特点，针对主流的双馈机组所构成的风电场，分析了风电场接入对接入点周边地区电网电压稳定性的主要影响，详细论述了风电场接入容量与电压稳定性的关系、电网出现大扰动时的暂态稳定性以及风电场低电压穿越能力。在此基础上，提出了改善电压稳定性的相关措施，研究了静止同步补偿器（static synchronous compensator，STATCOM）接入对电压稳定性的改善效果及其接入容量的选取。在DigSILENT／Powerfactory仿真平台对上述问题进行了仿真实验。结果表明：风电场接入容量过大，不利于地区电压稳定；为防止电网扰动时的电压失稳，一般应要求风电场具有低压穿越能力；合理地进行就地无功补偿有助于提高地区电压稳定性。
고필풍자원적수궤성화소접입전망적결구특점，침대주류적쌍궤궤조소구성적풍전장，분석료풍전장접입대접입점주변지구전망전압은정성적주요영향，상세논술료풍전장접입용량여전압은정성적관계、전망출현대우동시적잠태은정성이급풍전장저전압천월능력。재차기출상，제출료개선전압은정성적상관조시，연구료정지동보보상기（static synchronous compensator，STATCOM）접입대전압은정성적개선효과급기접입용량적선취。재DigSILENT／Powerfactory방진평태대상술문제진행료방진실험。결과표명：풍전장접입용량과대，불리우지구전압은정；위방지전망우동시적전압실은，일반응요구풍전장구유저압천월능력；합리지진행취지무공보상유조우제고지구전압은정성。
Considering the randomness of wind power source and structural features of power network connected with wind farm, the main influences of connecting wind power system consisting of doubly fed induction generators （DFIG） to power grid on voltage stability of local power network neighboring to connection point are analyzed. The relationship between wind farm capacity being connected to power grid and voltage stability, transient voltage stability under large disturbance occurred in power grid and low voltage ride through of wind farm are expounded. Based on the analysis results, the measures to improve voltage stability are proposed. The improving effect of static synchronous compensator （STATCOM） on voltage stability and the selection of the capacity of STATCOM are researched. Above-mentioned issues are simulated on DigSILENT/Powerfactory platform. Simulation results show that too large capacity of wind farm being connected to power grid is adverse to voltage stability of local power network neighboring to the connection point of wind farm; to prevent voltage instability under power grid disturbance, generally wind power systems ought to possess the capability of low voltage ride through; appropriate local reactive power compensation contributes to improve voltage stability of local power network.