Spatial-domain d<i>P/</i>d<i>V</i> calculation based photovoltaic control method

doi:10.3785/j.issn.1008-973X.2023.07.020

Journal of ZheJiang University (Engineering Science)

2023, Vol. 57

Issue (7): 1450-1459 DOI: 10.3785/j.issn.1008-973X.2023.07.020

Spatial-domain dP/dV calculation based photovoltaic control method

Jia-hua NI1(

),Ji XIANG1,*(

),Bo ZHAO2

1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
2. State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China

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Abstract

A novel approach was proposed to address the zero-denominator issue encountered in the current step calculation of dP/dV in order to eliminate steady-state oscillations in the output of photovoltaic (PV) system based on the perturbation and observation (P&O) method. dP/dV was calculated based on data from adjacent points in space, eliminating perturbation observation. The dP/dV value was directly used as the control variable. The zero-denominator issue was circumvented in the steady state, ensuring zero oscillation. The high-frequency signal updating feedback guaranteed a swift dynamic tracking process during dynamic states. The maximum power point tracking mode (dP/dV = 0) and the power standby mode (dP/dV < 0) were unified, achieving excellent output performance under various d P/dV reference values. Both Matlab/Simulink simulations and physical experiments were conducted. The superiority of the proposed algorithm in terms of maximum power tracking performance was demonstrated by comparing with traditional P&O algorithms and the latest MPPT algorithms. Further comparison with control methods based on time-domain dP/dV calculation showed the advantage of the proposed algorithm in power standby output performance.

Key words： photovoltaic (PV) maximum power point tracking (MPPT) power reserve steady state oscillation

Received: 08 July 2022 Published: 17 July 2023

CLC:

TM 91

Fund: 国家自然科学基金资助项目（62173295）

Corresponding Authors: Ji XIANG E-mail: nijiahua@zju.edu.cn;jxiang@zju.edu.cn

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Cite this article:

Jia-hua NI,Ji XIANG,Bo ZHAO. Spatial-domain dP/dV calculation based photovoltaic control method. Journal of ZheJiang University (Engineering Science), 2023, 57(7): 1450-1459.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.07.020 OR https://www.zjujournals.com/eng/Y2023/V57/I7/1450

基于空间域dP/dV计算的光伏控制方法

为了消除基于扰动观测方法下的光伏系统输出稳态振荡，针对当前步长计算中dP/dV存在的零分母问题，以空间上相邻的数据计算dP/dV，去掉扰动观测，直接以dP/dV作为控制变量. 在稳态下，避免了零分母问题，实现了稳态时无振荡；在动态下，高频的信号更新反馈保证了快速的动态跟踪过程. 统一了最大功率跟踪模式(dP/dV = 0)和功率热备模式(dP/dV < 0)，可以在不同的d P/dV参考值下实现优秀的输出性能. 在Matlab/Simulink仿真和实物实验中，通过与传统P&O算法及最新MPPT算法的对比，证明了所提算法在最大功率跟踪性能上的优势；与基于时域dP/dV计算的控制方法对比，证明了所提算法在功率热备输出性能上的优势.

关键词： 光伏（PV）, 最大功率跟踪(MPPT), 功率热备, 稳态振荡

Fig.1 Curves of KC200GT modules under different temperature and solar irradiance

Fig.2 Spatial-domian dP/dV calculation based PV control scheme

Fig.3 Definition of spatial-domain

Fig.4 Flowchart of spatial-domain dP/dV calculation

Fig.5 Accuracy of dP/dV tracking with different δ

Fig.6 Celerity of dP/dv tracking with different δ

Tab.1 PV System Parameters

Fig.7 PV output with different MPPT algorithms

Fig.8 Power reserved mode with different dP/dV calculation methods

Fig.9 PV generation experimental setup

Fig.10 Change curves of irradiance and temperature

Fig.11 PV behaviors with proposed spatial-domain dP/dv calculation method

Fig.12 PV behaviors with conventional P&O MPPT algorithm

Fig.13 PV behaviors with SOFT-MPPT algorithm

Fig.14 PV output of time-domain dP/dV calculation based control method under different dP/dV references

Fig.15 PV output of spatial-domain dP/dV calculation based control method under different dP/dV references


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