（1 Zhejiang Provincial New Energy Investment Group Co., Ltd, Hangzhou 310002, China;
2 National Power Investment Group Zhejiang New Energy Co., Ltd, Hangzhou 310002, China;
3 Department of Electrical Engineering, Tsinghua University, Beijing 100084, China）
Abstract: As the operation of wind power or time-varying working condition has some effects on subsynchronous oscillation stability, the paper puts forward a SSO quantitative assessment method based on the variable condition impedance model. It expresses impedance matrix elements into the quotient of quadratic form of working conditions (i.e. fundamental voltage and current) to calculate the frequency characteristics of aggregated impedance under different operating points, analyzing SSO stability under various operating conditions. The proposed method, taking Xinjiang Hami wind power system as an example, makes quantitative analysis of oscillation stability of two typical operating conditions, and verifies them through electromagnetic transient simulation. According to the results, the change of operating conditions such as the wind turbine number and unit power output will affect the system oscillation stability. This method can effectively evaluate the system oscillation risk under different operating conditions.
Key words: subsynchronous oscillation; wind power integrated system; impedance model
參考文獻(xiàn)
[1] 王一凡，趙成勇，郭春義. 直驅(qū)風(fēng)電場(chǎng)與柔直互聯(lián)系統(tǒng)的傳遞函數(shù)模型及其低頻振蕩穩(wěn)定性分析[J].中國(guó)電機(jī)工程學(xué)報(bào)，2020，40(5)：1485-1498.
[2] 郭賢珊，李云豐，謝欣濤，等. 直驅(qū)風(fēng)電場(chǎng)經(jīng)柔直并網(wǎng)誘發(fā)的次同步振蕩特性[J] . 中國(guó)電機(jī)工程學(xué)報(bào)，2020，40(4)：1149-1160.
[3] 呂敬，董鵬，施剛，等. 大型雙饋風(fēng)電場(chǎng)經(jīng) MMC-HVDC 并網(wǎng)的次同步振蕩及其抑制[J] . 中國(guó)電機(jī)工程學(xué)報(bào)， 2015，35(19)：4852-4860.
[4] SUN Jian.Impedance-Based Stability Criterion for Grid-Connected Inverters[J].IEEE Transactions on Power Electronics，2011，26(11)：3075-3078.
[5] ZHANG Chen, CAI Xu, MOLINAS M, et al.On the Impedance Modeling and Equivalence of AC/DCSide Stability Analysis of a Grid-Tied Type-IV Wind Turbine System[J].IEEE Transactions on Energy Conversion，2019，34(2)：1000-1009.
[6] MIAO Zhixin . Impedance-model-based SSR analysis for type 3 wind generator and seriescompensated network[J].IEEE Transactions on Energy Conversion，2012，27(4)：984-991.
[7] XU Yunyang, NIAN Heng, WANG Tao, et al.Frequency coupling characteristic modeling and stability analysis of doubly fedinduction generator[J].IEEE Transactions on Energy Conversion，2018，33(3)：1475-1486.
[8] 李紹階，王瑋，唐芬，等. 基于阻抗模型的并網(wǎng)變流器低頻振蕩機(jī)理研究[J] . 電網(wǎng)技術(shù)，2018，42(9)： 2787-2798.
[9] VIETO I, SUN Jian.Small-signal impedance modelling of type-Ⅲ wind turbine[C]//IEEE Power & Energy Society General Meeting， 2015.
[10] 武相強(qiáng)，王赟程，陳新，等. 考慮頻率耦合效應(yīng)的三相并網(wǎng)逆變器序阻抗模型及其交互穩(wěn)定性研究[J].中國(guó)電機(jī)工程學(xué)報(bào)，2020，40(5)：1605-1617.
[11] BAKHSHIZADEH M, WANG Xiongfei, BLAABJERG F,et al. Couplings in phase domain impedance modeling of grid-connected converters[J].IEEE Transactions on Power Electronics，2016，31(19)：6792-6796.
[12] 劉威，謝小榮，王衡，等. 基于頻率耦合阻抗模型的并網(wǎng)變流器全工況小信號(hào)穩(wěn)定性分析[J] . 中國(guó)電機(jī)工程學(xué)報(bào)，2020，40(22)：7212-7221.
[13] 張伯明，陳壽孫，嚴(yán)正. 高等電力網(wǎng)絡(luò)分析[M] .北京：清華大學(xué)出版社，2007.
[14] 占穎，謝小榮，王艷輝，等. 計(jì)及模式可觀度的阻抗網(wǎng)絡(luò)聚合方法[J] . 電網(wǎng)技術(shù)，2021，45(6)：2328-2334.
[15] 劉華坤，謝小榮，何國(guó)慶，等. 新能源發(fā)電并網(wǎng)系統(tǒng)的同步參考坐標(biāo)系阻抗模型及其穩(wěn)定性判別方法[J]. 中國(guó)電機(jī)工程學(xué)報(bào)， 2017， 37(14)：4002-4008.
[16] 謝小榮，劉華坤，賀靜波，等. 直驅(qū)風(fēng)機(jī)風(fēng)電場(chǎng)與交流電網(wǎng)相互作用引發(fā)次同步振蕩的機(jī)理與特性分析[J] . 中國(guó)電機(jī)工程學(xué)報(bào)，2016，36(9)：2366-2372.
