针对超级储能制动电容(Super-energy Storage and Brake Capacitor,SSBC)的结构电路图,通过公式推导和dq坐标变换得到SSBC的二阶时域数学模型。建立无励磁系统与SSBC的非线性控制模型,利用微分代数模型多指标非线性(Differential Algebr...针对超级储能制动电容(Super-energy Storage and Brake Capacitor,SSBC)的结构电路图,通过公式推导和dq坐标变换得到SSBC的二阶时域数学模型。建立无励磁系统与SSBC的非线性控制模型,利用微分代数模型多指标非线性(Differential Algebraic model Multi-index Nonlinear Control,DAMNC)方法来设计SSBC控制器,并与传统PID方法进行对比来验证DAMNC方法的优越性。仿真结果表明:该方法设计的SSBC控制器能很好地改善系统的动、静性能。展开更多
This paper presents a novel inter-cluster direct current(DC)capacitor voltage balancing control scheme for the single-star configured modular multilevel cascaded converter(MMCC)-based static synchronous compensator(ST...This paper presents a novel inter-cluster direct current(DC)capacitor voltage balancing control scheme for the single-star configured modular multilevel cascaded converter(MMCC)-based static synchronous compensator(STATCOM)under unbalanced grid voltage.The negative-sequence component of grid voltage at the point of common connection(PCC)causes unbalanced active power flow in the phase limbs of converter.This leads to the imbalance of DC voltages of the sub-module capacitors across the MMCC phases,and consequently,the malfunction of converter.The proposed solution is to inject both negative-sequence current(NSC)and zero-sequence voltage(ZSV)into the phase limbs of MMCC.A quantification factor Qf is used to achieve the sharing of inter-cluster active pow-er between the NSC and ZSV injection methods.Accurate determination of the quantification factor has been presented.In addition to maintaining the DC voltages of sub-module capacitor across the MMCC phases balanced,it also prevents the overcurrent and overvoltage of converter by injecting NSC and ZSV with the right proportion.The control scheme is validated on a 3.54 kV 1.2 MVA power system using MMCC-based STATCOM with 3-level bridge cells as sub-modules.The results show that the proposed scheme provides superior effectiveness in eliminating the voltage imbalance of DC capacitor in the phase limb while maintaining low voltage and current ratings.展开更多
文摘针对超级储能制动电容(Super-energy Storage and Brake Capacitor,SSBC)的结构电路图,通过公式推导和dq坐标变换得到SSBC的二阶时域数学模型。建立无励磁系统与SSBC的非线性控制模型,利用微分代数模型多指标非线性(Differential Algebraic model Multi-index Nonlinear Control,DAMNC)方法来设计SSBC控制器,并与传统PID方法进行对比来验证DAMNC方法的优越性。仿真结果表明:该方法设计的SSBC控制器能很好地改善系统的动、静性能。
文摘This paper presents a novel inter-cluster direct current(DC)capacitor voltage balancing control scheme for the single-star configured modular multilevel cascaded converter(MMCC)-based static synchronous compensator(STATCOM)under unbalanced grid voltage.The negative-sequence component of grid voltage at the point of common connection(PCC)causes unbalanced active power flow in the phase limbs of converter.This leads to the imbalance of DC voltages of the sub-module capacitors across the MMCC phases,and consequently,the malfunction of converter.The proposed solution is to inject both negative-sequence current(NSC)and zero-sequence voltage(ZSV)into the phase limbs of MMCC.A quantification factor Qf is used to achieve the sharing of inter-cluster active pow-er between the NSC and ZSV injection methods.Accurate determination of the quantification factor has been presented.In addition to maintaining the DC voltages of sub-module capacitor across the MMCC phases balanced,it also prevents the overcurrent and overvoltage of converter by injecting NSC and ZSV with the right proportion.The control scheme is validated on a 3.54 kV 1.2 MVA power system using MMCC-based STATCOM with 3-level bridge cells as sub-modules.The results show that the proposed scheme provides superior effectiveness in eliminating the voltage imbalance of DC capacitor in the phase limb while maintaining low voltage and current ratings.
