In the post-industrial digital-economy, motors powering manufacturing have been replaced by computers powering ecommerce - with significant financial losses attributable to poor power quality (PQ). At the same time, increasing penetration of distributed generation and constant power loads complicate the job for the electric utilities to deliver high-quality electrical power. Traditionally, voltage source converters provide PQ compensation; the backbone of these converters, however, are large electrolytic capacitors (e-caps), which have well-known failure rates. A D-STATCOM that does not use e-caps was shown to increase the converter service life and increase the reliability of the power system; finite control set model predictive control (MPC) was shown to achieve high fidelity tracking for multi-objective cost functions. However, high fidelity (to achieve low total harmonic distortion) results in high switching frequency, which increases losses and device stresses, and reduces the overall converter reliability. This paper improves the capacitorless D-STATCOM by investigating an adaptive MPC that trades-off high-fidelity performance and switching frequency, subject to IEEE 519 THD standards, to achieve good-enough performance. The method is verified experimentally in a 7.5 kVA D-STATCOM hardware prototype. The results show a reduction in switching frequency by over 30% compared with the MPC methods that prioritize high-fidelity alone.

中文翻译：

---

自适应模型预测控制器，可减少无电容D-STATCOM的开关损耗

在后工业数字经济中，为制造业提供动力的电动机已被为电子商务提供动力的计算机所取代-由于不良的电能质量（PQ）而造成了可观的财务损失。同时，不断增加的分布式发电渗透率和恒定功率负载使电力公司交付高质量电力的工作变得复杂。传统上，电压源转换器提供PQ补偿。但是，这些转换器的主干是大型电解电容器（e-caps），其故障率众所周知。不使用e-caps的D-STATCOM被证明可以延长转换器的使用寿命并提高电力系统的可靠性。结果表明，有限控制集模型预测控制（MPC）可以实现多目标成本函数的高保真跟踪。然而，高保真度（以实现较低的总谐波失真）导致较高的开关频率，这会增加损耗和器件应力，并降低转换器的整体可靠性。本文通过研究一种自适应MPC来改进无电容器D-STATCOM，该MPC在符合IEEE 519 THD标准的前提下，要在高保真性能和开关频率之间进行权衡，以获得足够好的性能。该方法已在7.5 kVA D-STATCOM硬件原型中进行了实验验证。结果表明，与仅优先考虑高保真度的MPC方法相比，开关频率降低了30％以上。本文通过研究一种自适应MPC来改进无电容器D-STATCOM，该MPC在符合IEEE 519 THD标准的前提下，要在高保真性能和开关频率之间进行权衡，以获得足够好的性能。该方法已在7.5 kVA D-STATCOM硬件原型中进行了实验验证。结果表明，与仅优先考虑高保真度的MPC方法相比，开关频率降低了30％以上。本文通过研究一种自适应MPC来改进无电容器D-STATCOM，该MPC在符合IEEE 519 THD标准的前提下，要在高保真性能和开关频率之间进行权衡，以获得足够好的性能。该方法已在7.5 kVA D-STATCOM硬件原型中进行了实验验证。结果表明，与仅优先考虑高保真度的MPC方法相比，开关频率降低了30％以上。