New energy grid-connected stability analysis method based on closed-loop transfer function

• Main Authors: WANG YIFEI, DUAN TAO, HUANG CANCAN, YAN WENHAI, ZHANG XIAN, YE LEI, CHENG ZHUANG, CHEN BAISEN, SHEN RUIXIN
• Format: Patent
• Language: Chinese; English
• Published: 09.05.2023
• Subjects: CALCULATING; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; COMPUTING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; GENERATION; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a new energy grid-connected stability analysis method based on a closed-loop transfer function, and the method comprises the steps: firstly obtaining the related parameters of a new energy related power electronic device and a grid side; secondly, respectively establishing impedance models of a fan side and a grid side; secondly, substituting an impedance model into the proposed closed-loop transfer function; and finally, calculating the pole of the closed-loop transfer function, and obtaining the damping and oscillation frequency of the system according to the subsynchronous stability criterion. According to the analysis method, the criterion has strict physical significance, the form is simple, the advantages of being low in order and relatively independent from the system relative to a state equation and an impedance method are combined, and the stability of the system can be accurately judged. 本发明公开一种基于闭环传递函数的新能源并网稳定性分析方法，首先，获取新能源相关电力电子器件与网侧的相关参数；其次，分别建立风机侧与网侧的阻抗模型；然后，将阻抗模型带入所提出的闭环