首页|改进下垂控制下的中压直流配电系统双时间尺度分层调控方法

改进下垂控制下的中压直流配电系统双时间尺度分层调控方法

扫码查看
原文链接
  • 万方数据
  • 维普
针对中压直流配电系统，在负荷激增、可再生能源出力突变等特殊工况下，传统优化调度方案与协调控制策略存在系统运行经济性有待提升、直流母线电压易越限的问题。为此，提出一种基于改进下垂控制的中压直流配电系统双时间尺度分层调控方法。首先，构建一种具备直流故障穿越能力的 3 端混合型模块化多电平换流器(modular multilevel converter，MMC)环状±10 kV中压直流配电系统，该系统含电动汽车充电站、储能系统、分布式光伏与风电等灵活性资源。其次，制定各单元协调控制策略，并采用tan函数改进传统下垂控制，以提高系统应对大幅功率波动的能力。然后，基于改进控制策略提出一种双时间尺度分层优化调控方法:在长时间尺度的系统调度层，以运行总成本最小为优化目标，确定各换流器参考功率;在短时间尺度的换流器间协调控制层，改进下垂曲线，并优化控制系数，以兼顾系统运行经济性与电能质量。最后，以典型算例验证该文所提优化调度方案及协调控制策略的有效性:通过灵活调度多种柔性资源，系统运行总成本可降低约 11%;在某数据中心负荷激增 100%的工况下，各直流母线电压波动仍能维持在±3%UN(额定电压)的允许范围内。
Dual-time-scale Hierarchical Regulation and Control for Medium-voltage DC Distribution System Under Improved Droop Control
In the medium-voltage DC distribution system(MVDC-DS),there are some moments when the loads surge or the renewable energy sources(RESs)fluctuate greatly.Under these conditions,the conventional regulation and control strategies have the problems that the scheduling plan is not economically optimal and the DC bus voltages are easy to violate.To solve these issues,a dual-time-scale hierarchical regulation and control method based on the improved droop control is proposed for the MVDC-DS in this paper.First,a±10 kV three-terminal hybrid modular multilevel converter(MMC)-based ring MVDC-DS is constructed with DC fault ride-through capability.This system integrates electric vehicle(EV)charging stations,energy storage system(ESS),distributed photovoltaic and wind turbines.Next,in order to improve the system stability under load surging,this paper improves the conventional droop control based on the tan-function.Then,a dual-time-scale hierarchical regulation and control method is proposed.In the long time-scale scheduling layer,the reference power of MMC is optimized to minimize the total operating cost.In the short time-scale control layer between converters,the droop control is improved and the control parameters are optimized to make a compromise between the economy and voltage quality.Finally,a case verifying the effectiveness of the proposed method is given as follows:By optimizing the scheduling of flexible resources,the total operating cost can be reduced by about 11%;when the load of a data center increases by 100%,all DC bus voltages can be bounded within the allowable range of±3%UN(rated voltage).

medium-voltage DC distribution system(MVDC-DS)hierarchical regulation and controldual-time-scale optimizationimproved droop controlparameter optimization

肖迁、陆文标、贾宏杰、穆云飞、余晓丹

展开 >

智能电网教育部重点实验室(天津大学),天津市 南开区 300072

中压直流配电系统 分层协调控制 双时间尺度优化 改进下垂控制 系数优化

国家自然科学基金国家自然科学基金国家自然科学基金

5210712152222704U2066213

2024

10.13334/j.0258-8013.pcsee.222632

中国电机工程学报
中国电机工程学会

中国电机工程学报

CSTPCD北大核心
影响因子：2.712
ISSN：0258-8013
年,卷(期)：2024.44(7)
  • 29