混合式配电变压器功角优化控制  

Power Angle Optimization Control of Hybrid Distribution Transformer

作　　者：柳轶彬 栗世超 梁得亮[1,2] 孔子涵 薛彦廷 LIU Yibin;LI Shichao;LIANG Deliang;KONG Zihan;XUE Yanting(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;Shaanxi Key Laboratory of Smart Grid,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电工材料电气绝缘全国重点实验室,西安710049 [2]陕西省智能电网重点实验室,西安710049

出　　处：《西安交通大学学报》2024年第7期116-128,共13页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(52207065);陕西省重点研发计划资助项目(2022GXLH-01-10)。

摘　　要：针对现有同相位控制无法使混合式配电变压器(HDT)损耗达到最小的问题,提出了HDT的最小损耗模式,以实现功角优化控制,从而降低其运行损耗。首先,建立HDT的相量关系,导出可变损耗与负荷、功率因数角、网侧电压波动系数、功角之间的函数关系;然后,导出最优功角的解析公式,据此建立最小损耗模式的计算流程,从而提出HDT功角优化控制策略。该策略的突出特点在于实时检测电网及负荷工况,进而在线算出实现最小损耗的最优功角;理论分析指出,负荷越轻、越接近纯阻性,电压同相位模式更接近最小损耗模式;反之,电流同相位模式更接近最小损耗模式。仿真及实验结果表明:在网侧电压波动及负载电流畸变工况下,所提出的功角优化控制策略能在实现网侧电流正弦单位功率因数控制及负载电压正弦稳定控制的前提下,有效减小HDT的损耗;轻载工况下,相比电流同相位模式,仿真和实验最小损耗模式能减小可变损耗的60%和42%;在额定负载下,相比电压同相位模式,仿真和实验最小损耗模式能减小可变损耗的46%和37%。To address the issue that the existing in-phase control strategy is ineffective in minimizing the loss in hybrid distribution transformers(HDTs),this paper introduces HDTs’minimum loss mode and power angle optimization control to reduce HDT operating loss.Specifically,an HDT phasors diagram is established,and the relationship between the HDT loss and the load value,power factor angle,grid voltage fluctuation coefficient,and power angle is derived.Subsequently,an analytical formula to calculate the optimal power angle is derived,along with the establishment of the calculation process for the minimum loss mode,and thus a power angle optimization control strategy for HDTs is formulated.The key feature of this strategy involves assessing both the grid and load conditions in real time to calculate the optimal power angle contributing to the minimum HDT loss.Theoretical analyses show that with lighter or more resistive loads,the in-phase voltage mode aligns better with the minimum loss mode;otherwise,the in-phase current mode aligns better with the minimum loss mode.Simulation and experimental results validate the effectiveness of the proposed power angle optimization control strategy in reducing the HDT loss,with the precondition of realizing sinusoidal unit power factor control of grid currents and sinusoidal stability control of load voltages in scenarios involving grid voltage fluctuations and load currents distortions.Specifically,simulation and experimental results show that under light load conditions,the minimum loss mode reduces the variable loss by 60%and 42%compared with the in-phase current mode.Similarly,in rated load scenarios,the minimum loss mode reduces the variable loss by 46%and 37%compared with the in-phase voltage mode.

关 键 词：混合式配电变压器 相量关系 功角优化 最小损耗 

分 类 号：TM421[电气工程—电器]