提供一种低成本的三相四开关并联型有源滤波器(Three-phase Four-switch Shunt Active Power Filter,简称TFS-APF),将其用于中、低压系统,可同时实现谐波电流抑制和无功功率补偿。采用直接将期望得到的电网正序基波电流作为TFSAPF指令...提供一种低成本的三相四开关并联型有源滤波器(Three-phase Four-switch Shunt Active Power Filter,简称TFS-APF),将其用于中、低压系统,可同时实现谐波电流抑制和无功功率补偿。采用直接将期望得到的电网正序基波电流作为TFSAPF指令电流信号的控制方法。为进一步提高检测算法的响应速度和自适应能力,引入模糊PI控制器。仿真与实验结果均证明TFSAPF及其指令电流检测算法的可行性和有效性。展开更多
For three phase four-wire active power filters （APFs）, several typical power theories and corresponding current reference generation strategies are induced, p-q, d-q, unify power factor （UPF） and instantaneous act...For three phase four-wire active power filters （APFs）, several typical power theories and corresponding current reference generation strategies are induced, p-q, d-q, unify power factor （UPF） and instantaneous active current （IAC） methods are analyzed and compared with each other. The interpretation of active and reactive currents in non-sinusoidal and unbalanced three-phase four-wire systems is given based on the generalized instantaneous reactive power theory. The performance and the characteristic are evaluated, and the application conditions of current reference generation strategies are concluded. Simulation results under different source voltages and loads verify the evaluation result.展开更多
A novel control strategy for three-phase shunt active power filter (SAPF) was proposed to improve its performance under non-ideal mains voltages. The approach was inspired by our finding that the classic instantaneous...A novel control strategy for three-phase shunt active power filter (SAPF) was proposed to improve its performance under non-ideal mains voltages. The approach was inspired by our finding that the classic instantaneous reactive power theory based algorithm was unsatisfactory in terms of isolating positive sequence fundamental active components exactly under non-ideal mains voltages. So, a modified ip-iq reference current calculation method was presented. With usage of the new method, not only the positive sequence but also the fundamental active current components can be accurately isolated from load current. A deadbeat closed-loop control model is built in order to eliminate both delay error and tracking error between reference voltages and compensation voltages under unbalanced and distorted mains voltages. Computer simulation results show that the proposed strategy is effective with better tracking ability and lower total harmonic distortion (THD). The strategy is also applied to a 10 kV substation with a local electrolysis manganese plant injecting a large amount of harmonics into the power system, and is proved to be more practical and efficient.展开更多
Power quality is a complex term that is defined by the legislation, but also as an obligation of the supplier and customer. The customer must return the negative effects of its consumers （taking reactive power, harmo...Power quality is a complex term that is defined by the legislation, but also as an obligation of the supplier and customer. The customer must return the negative effects of its consumers （taking reactive power, harmonic generation, phase unbalance） down to the prescribed limits. This primarily refers to the presence of non-linear consumers, leading to distortion of the basic parameters of voltage and current, in steady or transient conditions, and therefore the deformation of waveform. One way to reduce the negative feedback effects, especially with inductive loads, is the reactive energy compensation. The paper presents one of the solution for reactive power compensation, applied on the pumping station of public company ＂Waterworks and Sewerage---Bar＂, Bar.展开更多
文摘提供一种低成本的三相四开关并联型有源滤波器(Three-phase Four-switch Shunt Active Power Filter,简称TFS-APF),将其用于中、低压系统,可同时实现谐波电流抑制和无功功率补偿。采用直接将期望得到的电网正序基波电流作为TFSAPF指令电流信号的控制方法。为进一步提高检测算法的响应速度和自适应能力,引入模糊PI控制器。仿真与实验结果均证明TFSAPF及其指令电流检测算法的可行性和有效性。
文摘For three phase four-wire active power filters （APFs）, several typical power theories and corresponding current reference generation strategies are induced, p-q, d-q, unify power factor （UPF） and instantaneous active current （IAC） methods are analyzed and compared with each other. The interpretation of active and reactive currents in non-sinusoidal and unbalanced three-phase four-wire systems is given based on the generalized instantaneous reactive power theory. The performance and the characteristic are evaluated, and the application conditions of current reference generation strategies are concluded. Simulation results under different source voltages and loads verify the evaluation result.
基金Project(JC200903180555A) supported by Shenzhen City Science and Technology Plan, China
文摘A novel control strategy for three-phase shunt active power filter (SAPF) was proposed to improve its performance under non-ideal mains voltages. The approach was inspired by our finding that the classic instantaneous reactive power theory based algorithm was unsatisfactory in terms of isolating positive sequence fundamental active components exactly under non-ideal mains voltages. So, a modified ip-iq reference current calculation method was presented. With usage of the new method, not only the positive sequence but also the fundamental active current components can be accurately isolated from load current. A deadbeat closed-loop control model is built in order to eliminate both delay error and tracking error between reference voltages and compensation voltages under unbalanced and distorted mains voltages. Computer simulation results show that the proposed strategy is effective with better tracking ability and lower total harmonic distortion (THD). The strategy is also applied to a 10 kV substation with a local electrolysis manganese plant injecting a large amount of harmonics into the power system, and is proved to be more practical and efficient.
文摘Power quality is a complex term that is defined by the legislation, but also as an obligation of the supplier and customer. The customer must return the negative effects of its consumers （taking reactive power, harmonic generation, phase unbalance） down to the prescribed limits. This primarily refers to the presence of non-linear consumers, leading to distortion of the basic parameters of voltage and current, in steady or transient conditions, and therefore the deformation of waveform. One way to reduce the negative feedback effects, especially with inductive loads, is the reactive energy compensation. The paper presents one of the solution for reactive power compensation, applied on the pumping station of public company ＂Waterworks and Sewerage---Bar＂, Bar.
