| 引用本文: | 刘勃,陈中,王毅,周涛,谭林林.基于斜坡渐变扰动的新型电力系统等效惯量评估[J].电力自动化设备,2024,44(3):49-56 |
| LIU Bo,CHEN Zhong,WANG Yi,ZHOU Tao,TAN Linlin.Ramp gradient disturbance based equivalent inertia estimation of new type power system[J].Electric Power Automation Equipment,2024,44(3):49-56 |
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| 摘要: |
| 基于阶跃扰动的惯量评估方式依赖难以准确测量的初始频率变化率(RoCoF)与稀少的频率事件，而基于类噪声扰动的惯量评估方法无法评估电流源型虚拟惯量且对数据要求高。对此，提出基于可再生能源机组主动输出斜坡渐变扰动功率的惯量评估方法。建立含RoCoF与斜坡渐变扰动功率的等效惯量评估基础模型。考虑RoCoF噪声阶跃易导致等效惯量评估产生较大误差，推导双二阶广义积分锁相环中的q轴电压分量变化量与RoCoF的线性关系，并将其代入基础评估模型替代RoCoF。采用改进的非线性最小二乘拟合斜坡渐变扰动下q轴电压分量变化量与时间的非线性表达式，从拟合的表达式中提取系统等效惯量。在改进的EPRI-36中验证了所提评估方法相较于常规方法的优越性。 |
| 关键词: 新型电力系统 等效惯量 斜坡渐变扰动 惯量评估 q轴电压分量 频率变化率 |
| DOI：10.16081/j.epae.202312026 |
| 分类号:TM73 |
| 基金项目:智能电网保护和运行控制国家重点实验室资助项目(SGNR0000KJJS2200305) |
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| Ramp gradient disturbance based equivalent inertia estimation of new type power system |
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LIU Bo1, CHEN Zhong1, WANG Yi2, ZHOU Tao3, TAN Linlin1
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1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.State Key Laboratory of Smart Grid Protection and Control(State Grid Electric Power Research Institute Co.,Ltd.),Nanjing 211106, China;3.School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China
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| Abstract: |
| The step disturbance based inertia estimation relies on the initial rate of change of frequency (RoCoF) which is difficult to be measured accurately and rare frequency events, while the ambient perturbation-based inertia estimation method cannot estimate current-source virtual inertia and has strict requirements for the quality of measurement data. Thus, an inertia evaluation method is proposed based on renewable energy generation units actively providing output ramp gradient disturbance power. An equivalent inertia estimation basic model is established that contains RoCoF and ramp gradient perturbation power. Considering that RoCoF noise step is liable to result in a large error in the equivalent inertia estimation, the linear relationship between the q-axis voltage component variation and RoCoF in the double second-order generalized integrator phase-locked loop is derived and substituted for RoCoF in the basic estimation model. An improved nonlinear least squares method is used to fit the nonlinear expression between the q-axis voltage component variation and time under ramp gradient disturbance, from which the system equivalent inertia is extracted. The superiority of the proposed estimation method over conventional methods is verified in the improved EPRI-36. |
| Key words: new type power system equivalent inertia ramp gradient disturbance inertia estimation q-axis voltage component rate of change of frequency |
