Five-zone theory is of voltage and reactive power control (VQC), different from the classic nine-zone theory in control target.
五區圖控制理論是一種控制對象與傳統九區圖完全不同的電壓無功綜合控制(VQC)原理。
The Self-adjusting Limits and Harmony Control of Multi-VQC in Yibin Power System;
Distribution Transformer-Capacitor unit Micro-impact VQC