光伏电池是一种非线性电源,随外界环境的变化而变化,为了提高光伏阵列的利用率,光伏系统中需采用最大功率跟踪(maximum power point tracking,MPPT)。近年的研究中,提出了许多跟踪算法,其中应用最为广泛的是扰动观察法和电导增量法。在...光伏电池是一种非线性电源,随外界环境的变化而变化,为了提高光伏阵列的利用率,光伏系统中需采用最大功率跟踪(maximum power point tracking,MPPT)。近年的研究中,提出了许多跟踪算法,其中应用最为广泛的是扰动观察法和电导增量法。在分析扰动观察法的基础上,进行优化提出了一种改进的变步长算法,它有效提高了最大功率点跟踪过程中的跟踪速率,克服了扰动方向的误判问题,消除了在最大功率点的振荡现象。仿真与实验结果证明了该方法的有效性。展开更多
For a standalone PV (photovoltaic) power generation system, the author previously proposed a new MPPT (maximum power point tracking) control method in which the I-V characteristics are scanned with a detection int...For a standalone PV (photovoltaic) power generation system, the author previously proposed a new MPPT (maximum power point tracking) control method in which the I-V characteristics are scanned with a detection interval control that operates at specified intervals and monitors the maximum power point. The author has obtained satisfactory results using this new MPPT control method. This paper investigates the application of the new MPPT control method for a PCS (power conditioning system) in a grid-connected type PV power generation system. The experimental results clearly demonstrate that the developed PCS offers outstanding effectiveness in tracking the maximum power point in partially shaded environments.展开更多
Nowadays, in a household PV (photovoltaic) generation system, it is generally connecting PV modules in series and then output to the power-conditioner. However, when PV modules are mismatched, it will lead to a wron...Nowadays, in a household PV (photovoltaic) generation system, it is generally connecting PV modules in series and then output to the power-conditioner. However, when PV modules are mismatched, it will lead to a wrong MPPT (maximum power point tracking) to all modules and a power decreasing of the whole system. Aiming at this problem, this paper presents the idea which improves the MPPT without changing the conventional power-conditioner, by adding a Buck type DC-DC (direct current) converter behind each module. Simulations of PSIM (power simulation) and experiments are taken to prove this theory. The result shows that, by this idea, the generated power of the conventional PV generation system can be greatly increased under the condition of mismatch.展开更多
文摘光伏电池是一种非线性电源,随外界环境的变化而变化,为了提高光伏阵列的利用率,光伏系统中需采用最大功率跟踪(maximum power point tracking,MPPT)。近年的研究中,提出了许多跟踪算法,其中应用最为广泛的是扰动观察法和电导增量法。在分析扰动观察法的基础上,进行优化提出了一种改进的变步长算法,它有效提高了最大功率点跟踪过程中的跟踪速率,克服了扰动方向的误判问题,消除了在最大功率点的振荡现象。仿真与实验结果证明了该方法的有效性。
文摘For a standalone PV (photovoltaic) power generation system, the author previously proposed a new MPPT (maximum power point tracking) control method in which the I-V characteristics are scanned with a detection interval control that operates at specified intervals and monitors the maximum power point. The author has obtained satisfactory results using this new MPPT control method. This paper investigates the application of the new MPPT control method for a PCS (power conditioning system) in a grid-connected type PV power generation system. The experimental results clearly demonstrate that the developed PCS offers outstanding effectiveness in tracking the maximum power point in partially shaded environments.
文摘Nowadays, in a household PV (photovoltaic) generation system, it is generally connecting PV modules in series and then output to the power-conditioner. However, when PV modules are mismatched, it will lead to a wrong MPPT (maximum power point tracking) to all modules and a power decreasing of the whole system. Aiming at this problem, this paper presents the idea which improves the MPPT without changing the conventional power-conditioner, by adding a Buck type DC-DC (direct current) converter behind each module. Simulations of PSIM (power simulation) and experiments are taken to prove this theory. The result shows that, by this idea, the generated power of the conventional PV generation system can be greatly increased under the condition of mismatch.