电力系统自动化2025，Vol.49Issue(7)：80-90,11.DOI:10.7500/AEPS20240301001
并网换流器控制参数安全域构建方法及控制交互作用分析
Construction Method and Control-interaction Analysis of Security Region for Control Parameters of Grid-connected Converter
摘要
Abstract
The interaction between the phase-locked loop(PLL)and the DC voltage control loop of a power electronic converter under weak grid conditions may trigger oscillations.In order to reduce the risk of oscillation caused by the grid-connected converters,a method for determining the boundary of the security region for the control parameter is proposed.By studying the relative constraint relationship of the control bandwidth,the influence law of each control parameter on the interaction between the main control links of the grid-connected converter and between the controller and the weak grid is quantitatively analyzed.First,from the perspective that the dynamic response characteristics of the overlapped region of the controller bandwidth are similar,a mathematical analytical expression model of the closed-loop transfer function of the outer DC voltage loop covering the grid strength and each control link is established.Then,based on the analytical expression of this transfer function,the boundary of the security region for the control bandwidth ratio is solved by using the Nyquist stability criterion and stability margin constraints.The result can guide the design of the PLL and DC voltage control bandwidths under weak grid conditions and map it to the security region for each control parameter.In addition,the security region for control parameters intuitively reflects the influence of differences in parameter settings of the grid-connected converter on system stability,thereby guiding the adjustment direction of control parameters.Finally,the effectiveness and accuracy of the proposed method are verified through PSCAD/EMTDC simulations.关键词
并网换流器/安全域/控制参数/稳定性/交互/锁相环/直流电压控制Key words
grid-connected converter/security region/control parameter/stability/interaction/phase-locked loop/DC voltage control引用本文复制引用
王瑾媛,刘崇茹,苏晨博,吴文传,房佳姝..并网换流器控制参数安全域构建方法及控制交互作用分析[J].电力系统自动化,2025,49(7):80-90,11.基金项目
国家重点研发计划资助项目(2022YFB2402704) （2022YFB2402704）
国家电网公司科技项目(52272222001J). This work is supported by National Key R&D Program of China(No.2022YFB2402704)and State Grid Corporation of China(No.52272222001J). （52272222001J）
