提出了新能源直流汇集系统分群综合协调控制策略,该策略分为功率控制和电压控制两部分。功率控制包括系统各分群内的计划功率及分群间的联络线功率控制,分群内的计划功率考虑了电网分时电价及储能的运行状态,可提高系统运行的经济性;分...提出了新能源直流汇集系统分群综合协调控制策略,该策略分为功率控制和电压控制两部分。功率控制包括系统各分群内的计划功率及分群间的联络线功率控制,分群内的计划功率考虑了电网分时电价及储能的运行状态,可提高系统运行的经济性;分群间的联络线功率控制采用基于直流分群控制误差(DC group control error, DGCE)的传输功率控制,既保证了分群间的功率互济,也尽可能实现分群运行的独立性。电压控制采用基于一致性算法的电压二次控制结合下垂控制,使直流汇集系统运行在较好的电压水平。最后通过MATLAB/Simulink仿真软件对直流汇集系统在单位工作日下的运行状态进行仿真验证,结果表明采用控制策略后系统的经济性与电压水平均提高,且功率流动更加合理。展开更多
The full-bridge converters usually use transformer leakage inductance and parallel resonant capacitors to achieve smooth current commutation and soft switching functions,which can easily cause problems such as energy ...The full-bridge converters usually use transformer leakage inductance and parallel resonant capacitors to achieve smooth current commutation and soft switching functions,which can easily cause problems such as energy leakage and significant duty cycle loss.This paper designs a novel full-bridge zero-current(FB-ZCS)converter with series resonant capacitors and proposes a frequency and phase-shift synthesis modulation(FPSSM)control strategy based on this topology.Compared with the traditional parallel resonant capacitor circuit,the passive components used are significantly reduced,the structure is simple,and there is only a slight energy loss.By controlling the charging time of the capacitor,it can be achieved without additional switches or auxiliary circuits.The automatic control of capacitor energy based on input current addresses the low efficiency of the traditional control strategies.This paper introduces its principle in detail and verifies it through simulation.Finally,an experimental prototype was built further to demonstrate the feasibility of the theory through experiments.The module can be applied to a photovoltaic DC collection system using input parallel output series(IPOS)cascade to provide a new topology for large-scale,long-distance DC transmission.展开更多
文摘提出了新能源直流汇集系统分群综合协调控制策略,该策略分为功率控制和电压控制两部分。功率控制包括系统各分群内的计划功率及分群间的联络线功率控制,分群内的计划功率考虑了电网分时电价及储能的运行状态,可提高系统运行的经济性;分群间的联络线功率控制采用基于直流分群控制误差(DC group control error, DGCE)的传输功率控制,既保证了分群间的功率互济,也尽可能实现分群运行的独立性。电压控制采用基于一致性算法的电压二次控制结合下垂控制,使直流汇集系统运行在较好的电压水平。最后通过MATLAB/Simulink仿真软件对直流汇集系统在单位工作日下的运行状态进行仿真验证,结果表明采用控制策略后系统的经济性与电压水平均提高,且功率流动更加合理。
基金This work was supported by the Key R&D Program of Tianjin(No.20YFYSGX00060).
文摘The full-bridge converters usually use transformer leakage inductance and parallel resonant capacitors to achieve smooth current commutation and soft switching functions,which can easily cause problems such as energy leakage and significant duty cycle loss.This paper designs a novel full-bridge zero-current(FB-ZCS)converter with series resonant capacitors and proposes a frequency and phase-shift synthesis modulation(FPSSM)control strategy based on this topology.Compared with the traditional parallel resonant capacitor circuit,the passive components used are significantly reduced,the structure is simple,and there is only a slight energy loss.By controlling the charging time of the capacitor,it can be achieved without additional switches or auxiliary circuits.The automatic control of capacitor energy based on input current addresses the low efficiency of the traditional control strategies.This paper introduces its principle in detail and verifies it through simulation.Finally,an experimental prototype was built further to demonstrate the feasibility of the theory through experiments.The module can be applied to a photovoltaic DC collection system using input parallel output series(IPOS)cascade to provide a new topology for large-scale,long-distance DC transmission.
