基于标准特征多项式的变电站光储直柔系统双向AC/DC变换器控制策略
Control Strategy of the Bidirectional AC/DC Converter in the Substation PEDF System Based on Standard Characteristic Polynomial
周贤富 1楼平 1陈哲 2陈家乾 3赵崇娟 3齐蓓 4柯吉5
作者信息
- 1. 国网浙江省电力有限公司湖州供电公司,浙江湖州 313000
- 2. 国网浙江省电力有限公司,浙江杭州 310000
- 3. 湖州电力设计院有限公司,浙江湖州 313000
- 4. 国网电力科学研究院武汉能效测评有限公司,湖北武汉 430000
- 5. 长安大学能源与电气工程学院,陕西西安 710018
- 折叠
摘要
为增强变电站光储直柔系统的可靠性,针对其在并网过程中会对变电站电能质量造成不良影响,以及现有设计方法难于工程化问题提出了一种面向工程化的基于标准特征多项式配置方法(SCP)的双向AC/DC变换器控制策略.通过建立变电站光储直柔(PEDF)系统变换器的数学模型,并分析控制器参数对变换器在不同运行模式下的电能质量的影响,然后采用SCP方法来配置闭环系统特征值,分析该方法对抑制并网电流谐波、改善AC/DC变换器并网电能质量的作用,最后对此进行仿真分析并和传统PI控制器效果进行比较,结果表明:所提策略降低了AC/DC变换器在谐波畸变率和并网电流不对称度,系统设计简便,且具有很好地鲁棒性,适合工程实践.
Abstract
To enhance the reliability of the PEDF(photovoltaic,energy storage,direct current,and flexibility)system in substations and restrain the adverse effects of power quality during grid connection as well as realization difficulties of the existing controller design in the actual engineering project,this paper proposes an engineering-oriented bidirectional AC/DC converter control strategy based on standard characteristic polynomial configuration method.By establishing the mathematical model of the three-phase AC/DC bidirectional converter in the PEDF system of substations,and analyzing the influence of controller parameters on the output power quality of the converter under different operating modes,the closed-loop system is designed based on the standard characteristic polynomial eigenvalue configuration method,and the parameters are designed accordingly.Furthermore,the effect of this method on suppressing grid current harmonics and improving the power quality of the AC/DC converter during grid connection is analyzed.Finally,the circuit is simulated and compared with traditional PI controllers to prove that strategy reduces the harmonic distortion rate and grid-connected current asymmetry of the AC/DC converter.In addition,the proposed system design is simple with excellent robustness,which is suitable for engineering practice.
关键词
光储直柔/变电站/AC/DC双向变换器/SCP/电压电流双环控制Key words
PEDF/substation/bidirectional AC/DC converter/standard characteristic polynomial/voltage and current double loop control引用本文复制引用
基金项目
陕西省重点研发计划(2023-YBSF-285)
国家电网浙江省电力公司湖州供电公司集体企业科技项目(CY840800JS20230018)
出版年
2024
NETL
NSTL
万方数据