Semimonthly

ISSN 1000-1026

CN 32-1180/TP

+Advanced Search 中文版
Optimal Combination of Operation Strategy for Power Electronic Transformer Based on Generalized Droop Control
Author:
Affiliation:

1.School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China;2.China Electric Power Research Institute, Beijing 100192, China;3.State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2017YFB0903300) and National Natural Science Foundation of China (No. 51777065).

  • Article
  • |
  • Figures
  • |
  • Metrics
  • |
  • Reference
  • |
  • Related
  • |
  • Cited by
  • |
  • Materials
    Abstract:

    For the complexity of operation mode of the power electronic transformer (PET) ports and their multiple combinations in hybrid AC/DC grid composed of several PETs, an optimal combination method of operation strategy for PETs based on generalized AC/DC droop control (GADDC) is proposed, the objective of which is to fully utilize the renewable energy while maintaining the stability operation of power system. The switching between different control modes of PET ports could be approximated by adjusting the coefficients of GADDC, which avoids importing integer variables in the non-linear programming model, thus effectively reducing the complexity of the proposed model. Based on this, a robust combined optimization model of PET operation strategy considering the uncertainty of renewable energy is established. Furthermore, a bi-level optimization method is adopted to solve the proposed model. Simulation results verify the effectiveness and feasibility of the proposed method.

    表 5 不同方案下从主网购电量Table 5 Electricity purchasing from power grid in different schemes
    表 12 Table 12
    表 8 Table 8
    表 10 Table 10
    表 7 交流端口控制模式及系数Table 7 Control modes and coefficients of AC ports
    表 9 Table 9
    表 2 交流端口控制系数Table 2 Control coefficients of AC ports
    表 3 预测误差改变后直流端口控制系数Table 3 Control coefficients of DC ports after prediction error change
    表 11 Table 11
    图1 模型求解流程图Fig.1 Flow chart of model solution
    图2 PV接入位置对直流端口调控比的影响Fig.2 Impact of PV position on regulation ratio of DC port
    图3 直流电压最低节点电压对比Fig.3 Voltage comparison of nodes with the lowest DC voltage
    图4 交流网络频率对比Fig.4 Comparison of AC network frequencies
    图5 示范工程拓扑图Fig.5 Topology of demonstration project
    图1 模型求解流程图Fig.1 Flow chart of model solution
    图2 PV接入位置对直流端口调控比的影响Fig.2 Impact of PV position on regulation ratio of DC port
    图3 直流电压最低节点电压对比Fig.3 Voltage comparison of nodes with the lowest DC voltage
    图4 交流网络频率对比Fig.4 Comparison of AC network frequencies
    图5 示范工程拓扑图Fig.5 Topology of demonstration project
    图 广义交直流下垂控制原理图Fig. Schematic of generalized AC-DC droop control
    图 2台四端口PET连接的仿真算例系统Fig. Simulation system connected by two four- port PETs
    图 光伏、风电预测出力曲线及误差区间Fig. Prediction curve and bias interval of PV and wind power
    图 节点负荷功率曲线Fig. The prediction load curve
    表 6 直流端口控制模式及系数Table 6 Control modes and coefficients of DC ports
    表 1 直流端口控制系数Table 1 Control coefficients of DC ports
    表 4 预测误差改变后交流端口控制系数Table 4 Control coefficients of AC ports after prediction error change
    Reference
    Related
    Cited by
Get Citation

HU Liping,SUN Yingyun,WANG Chunfei,et al.Optimal Combination of Operation Strategy for Power Electronic Transformer Based on Generalized Droop Control[J].Automation of Electric Power Systems,2020,44(3):40-48.DOI:10.7500/AEPS20190319005

Copy
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:March 19,2019
  • Revised:July 22,2019
  • Adopted:
  • Online: February 14,2020
  • Published: