摘要
机电模式(EOM)是与同步发电机(SG)机械暂态强相关的振荡模式,对SG轴系和电网稳定影响较大。为了抑制EOM,可以调节SG出力以减小机电回路相关比(ρ),但需要以灵敏度为依据。双馈感应风电机组(DFIG)并网后,需要联立SG和DFIG以建立系统状态矩阵,增加了抑制EOM的难度。针对DFIG并网电力系统,筛选出EOM。将ρ对控制参数的灵敏度,展开为对参与因子的灵敏度。考虑参与因子由特征向量组成,补充后者幅值和相位约束,得到特征向量灵敏度的唯一解。考虑SG出力间接影响节点电压和特征值,引入潮流雅可比矩阵的逆,建立特征值和特征向量对SG出力的灵敏度。最终首次提出ρ对SG出力灵敏度的解析表达。结果验证了所提灵敏度的准确性。调节SG出力后,危险机电模式19,20的ρ减小约13%,验证了所提算法对EOM的抑制效果。
The electromechanical oscillation modes(EOMs)are the oscillations closely related to the mechanical transient of the synchronous generators(SGs),with severe impact on the shafts of SGs and system stability.The SG’s output can be adjusted to reduce the electromechanical loop participation ratio(ρ)to damp the EOM,wheras it depends on the sensitivity modelto be derived.With the doubly-fed induction generators(DFIGs)integrated,the SGs and DFIGs are included in the state matrix,thus the difficulty of damping the EOMs also increases.In this paper,the EOMs of the DFIG-integrated power system are derived.The sensitivities ofρto the control parameters are given by the sensitivities of the participation factors.The participation factor is composed of the eigenvectors,thus the constraints of the magnitude and angle of the latter are supplemented to find the unique sensitivity of the eigenvector.The SGs’outputs affect the bus voltage and the eigenvalues,but are not shown in the state matrix.Hence the inverse of the Jacobian matrix of power flow solution is applied to derive the sensitivities of the eigenvalues and eigenvectors to the SG’s output.The analytical sensitivity model ofρto the outputs of the SGs is finally proposed.After adjusting the SGs’output,theρof the serious EOM 19,20 decreases by about 13%,which verifies the damping effect of the proposed method on EOM.
作者
李生虎
方天扬
张浩
韩伟
宋闯
张奥博
LI Shenghu;FANG Tianyang;ZHANG Hao;HAN Wei;SONG Chuang;ZHANG Aobo(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2021年第10期3414-3423,共10页
High Voltage Engineering
基金
国家自然科学基金(51877061)
国家电网公司科技项目(52170221000U)。
关键词
机电模式抑制
机电回路相关比
灵敏度
同步发电机
双馈感应发电机
electromechanical mode damping
electromechanical loop participation ratio
sensitivity
synchronous generator(SG)
doubly-fed induction generation(DFIG)
