一种用于非平衡分布式微网的双重灵活模型预测功率控制方法  

A dual flexible model predictive power control method for unbalanced distributed microgrids

作　　者：郭敬梅 盛超 余超耘 汤清岚 曾有芝 苏秦 GUO Jingmei;SHENG Chao;YU Chaoyun;TANG Qingan;ZENG Youzhi;SU Qin(Guangdong Provincial Key Laboratory of New Technology for Smart Grid,Guangzhou 510080,China;China Southern Power Grid Technology Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]广东省智能电网新技术企业重点实验室,广东广州510080 [2]南方电网电力科技股份有限公司,广东广州510000

出　　处：《电力系统保护与控制》2024年第23期107-118,共12页Power System Protection and Control

基　　金：中国南方电网有限责任公司科技项目资助(GDKJXM20240547)。

摘　　要：分布式微网(比如车载微网)的电能质量受到不平衡负载的严重影响,单相负载(不平衡负载)的运行会导致这类系统出现不平衡的系列问题,危及系统的可靠性并缩短其使用寿命。现有控制策略通常局限于抑制功率波动,并未充分考虑电流畸变、公共连接点(point of common coupling, PCC)电压不平衡等问题。针对功率波动问题,基于传统灵活功率控制,对模型预测控制(model predictive control, MPC)的控制层进行了优化,改进了自适应系数的计算方式。在此基础上,设计了双重灵活模型预测控制(dual-flexible model predictive control, DF-MPC),采用新型双层灵活计算结构,优先选择电压平衡效果最佳的控制矢量。该方法在额定功率为10 kW的原型硬件平台上进行了测试。实验结果表明,所提出的DF-MPC方法能够有效抑制功率波动、降低PCC电压的不平衡程度、同时保持较高的电能质量。The power quality of distributed microgrid(e.g.,on-board microgrids)is severely affected by unbalanced loads,and the operation of single-phase loads(unbalanced loads)can lead to a series of imbalance issues in such systems,endangering system reliability and shortening lifespan.Existing control strategies are typically limited to suppressing power fluctuations and do not adequately address issues such as current distortion and point of common coupling(PCC)voltage imbalance.Addressing power fluctuations,this paper optimizes the control layer of the model predictive control(MPC)based on traditional flexible power control,improving the calculation of adaptive coefficients.Building upon this,a dual-flexible model predictive control(DF-MPC)is designed,employing a novel dual-layer flexible computational structure that prioritizes the selection of control vectors with the best voltage balancing effect.This method is tested on a prototype hardware platform with a rated power of 10 kW.Experimental results demonstrate that the proposed DF-MPC method can effectively suppress power fluctuations,reduce the degree of PCC voltage imbalance,and maintain high power quality.

关 键 词：模型预测控制 功率控制 不平衡微网 T型三电平变换器 

分 类 号：TM73[电气工程—电力系统及自动化]