In this work, the design and implementation of a three-phase ± 100 kVAR energy quality regulator (EQR) which is capable of providing reactive power/neutral current compensation, load balancing as well as low order current harmonic mitigation is presented. The proposed EQR is based on three-leg four-wire voltage source converter topology with split capacitors in the DC link. At first, the power stage and the control system of the EQR are modelled and verified in PSCAD/EMTDC by extracting the compensation reference currents in synchronous reference frame. After that, the hardware of the EQR based on naturel air forced IGBT modules switching at 5 kHz is developed and practically implemented. The developed EQR control card is based on two Arm Cortex-M4 microprocessors © which handles all control and protection functions. Closed loop operation of the EQR is ensured with P, PI and PR type controllers due to their simplicity and reliability in practical applications. The field tests in a 50 Hz live distribution circuit are carried out by connecting the EQR to the low voltage side of a three-phase 34.5/0.4 kV 400 kVA distribution transformer. It is verified by real-time measurements that the EQR is able to perform the aforementioned compensation functions simultaneously.

在这项工作中，介绍了三相 ± 100 kVAR 能量质量调节器 (EQR) 的设计和实现，该调节器能够提供无功功率/中性线电流补偿、负载平衡以及低次电流谐波抑制。提议的 EQR 基于三腿四线电压源转换器拓扑结构，在 DC 链路中带有分离电容器。首先，通过提取同步参考系中的补偿参考电流，在 PSCAD/EMTDC 中对 EQR 的功率级和控制系统进行建模和验证。之后，开发了基于自然空气强制 IGBT 模块在 5 kHz 开关的 EQR 硬件并实际实现。开发的 EQR 控制卡基于两个 Arm Cortex-M4 微处理器 ©，可处理所有控制和保护功能。由于 P、PI 和 PR 型控制器在实际应用中的简单性和可靠性，可以确保 EQR 的闭环操作。通过将 EQR 连接到三相 34.5/0.4 kV 400 kVA 配电变压器的低压侧，可以在 50 Hz 带电配电电路中进行现场测试。通过实时测量验证 EQR 能够同时执行上述补偿功能。