Optimal third harmonic injection based nearest level control of large-scale solar photovoltaic multilevel converter

Shivam Kumar Yadav, Nidhi Mishra, Bhim Singh
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引用次数: 2

Abstract

This paper presents a new control approach with an optimal third harmonic injection-based nearest level modulation (OTHI-NLM) technique for a large-scale solar photovoltaic (SPV) system. This system uses a single-source multilevel converter to feed solar power into the grid. The merits of the optimal third harmonic injection (OTHI) and nearest level modulation (NLM) are considered for switching the SPV converter. A unique analysis to have an adaptive optimal injection with varying solar irradiance is conducted and compared with the well-known carrier-based high-frequency switching technique. The variations of harmonics for OTHI-NLM, an optimal third harmonic pulse width modulation (OTHI-PWM), and a constant third harmonic injection method are analysed at different irradiance levels. This optimal injection provides benefits such as enhanced DC bus utilization (DBU), better harmonics performance at different solar irradiance levels. The detailed methodology of the OTHI algorithm, nearest level modulation (NLM) technique with an optimal quotient calculation, and an instantaneous optimal third harmonic injection (THI) in closed-loop are presented. The comparative analysis shows the effectiveness of the SPV grid-tied structure over well-known ones. The power quality of the renewable energy system is investigated in dynamic solar irradiations. Moreover, simulation results are presented and validated in a real-time test bench.

Abstract Image

基于近电平控制的大型太阳能光伏多电平变流器最优三次谐波注入
针对大型太阳能光伏系统,提出了一种基于最优三次谐波注入的最近邻调制(OTHI-NLM)控制方法。该系统使用一个单源多电平转换器将太阳能输入电网。考虑了最优三次谐波注入(OTHI)和最近电平调制(NLM)的优点来切换SPV变换器。对太阳辐照度变化下的自适应最优注入进行了独特的分析,并与众所周知的基于载流子的高频开关技术进行了比较。分析了在不同辐照度下,优化三次谐波脉宽调制(OTHI-PWM)和恒定三次谐波注入方法的谐波变化。这种最佳注入提供了诸如提高直流母线利用率(DBU),在不同太阳辐照水平下更好的谐波性能等优点。详细介绍了OTHI算法、最优商计算的最近电平调制(NLM)技术和闭环瞬时最优三次谐波注入(THI)的方法。对比分析表明,SPV并网结构优于常用并网结构。研究了动态太阳辐射下可再生能源系统的电能质量。给出了仿真结果,并在实时试验台上进行了验证。
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