含DFIG风电场电-气耦合系统的概率连续混合潮流方法及其负荷裕度分析  

Probabilistic continuous hybrid flow method for electricity-gas coupling system integrated with DFIG wind farm and its load margin analysis

作　　者：马瑞[1] 秦佳倩 MA Rui;QIN Jiaqian(School of Electrical & Information Engineering,Changsha University of Science and Technology,Changsha 410007,China)

机构地区：[1]长沙理工大学电气与信息工程学院

出　　处：《电力自动化设备》2019年第8期38-46,共9页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51677007);湖南省自然科学基金资助项目(2019JJ40298)~~

摘　　要：针对含双馈感应式风机(DFIG)风电场电-气耦合多能流系统的最大负荷裕度及其耦合影响问题,考虑天然气管网的动态特性,建立考虑DFIG稳态模型和能源路由器(EH)的含参连续混合潮流模型;采用随机响应面法(SRSM)拟合DFIG出力,结合预估-校正及电-气系统耦合交替迭代获取电力系统负荷节点的有功功率-电压曲线、天然气系统流量-气压曲线及其负荷裕度期望值;定义电压-负荷、气压-流量灵敏度,可分别跟随电力系统负荷节点有功功率-电压曲线、天然系统气流量-气压曲线的获取,定义电-气耦合环节中天然气系统节点压强-EH节点注入电功率和电力系统节点电压-EH节点天然气注入流量灵敏度,从而定量评估电-气耦合下电力系统、天然气系统和电-气耦合环节的薄弱节点及EH耦合程度。含DFIG风电场的IEEE14节点电力系统和22节点天然气系统通过11个EH耦合而成的电-气系统的算例仿真结果验证了所提模型、算法和所定义负荷裕度灵敏度指标的正确性和有效性。Aiming at the problems of the maximum load margin and its coupling effect of the electricity-gas coupling multi-energy flow system integrated with DFIG(Doubly-Fed Induction Generator)-based wind farm,based on the dynamic characteristics of natural gas pipeline network,the continuous hybrid flow models with parameters are established considering DFIG steady-state model and EH(Energy Hub).The SRSM(Stochastic Response Surface Method)is used to fit the output of DFIG,combining prediction-correction and the alternate iteration of electricity-gas coupling system,the active power-voltage curves of the electric power system load nodes,the natural gas flow-gas pressure curves of natural gas system and their expected load margins are obtained.The voltage-load sensitivity and gas pressure-natural gas flow sensitivity are defined,which can be obtained with the active power-voltage curve of the electric power system load node and the natural gas system flow-gas pressure curve of natural gas system respectively.In the electricity-gas coupling link,the sensitivities of natural gas system node pressure-injection electric power of EH node and the electric power system node voltage-natural gas injection flow of EH node are defined,based on which,the EH coupling degree and the weak nodes of electric power system,natural gas system and electricitygas coupling link can be evaluated quantitatively.Simulative results of the electricity-gas coupling system,coupling with the IEEE 14-bus system with DFIG-based wind farm and the 22-node natural gas system through 11 EHs,verify the correctness and effectiveness of the proposed model,algorithm and the defined load margin sensitivity indexes.

关 键 词：电-气耦合系统 动态特性 灵敏度分析 随机响应面法 连续潮流 双馈感应式风机 负荷裕度 

分 类 号：TM761[电气工程—电力系统及自动化] TM614