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Parallel multi-inverter modules are characterised by expandable output power and improved reliability. A current-sharing control scheme has to be employed to achieve equally load current sharing of paralleled inverters. At present, circulating active/reactive power are applied to control the voltage in some current-sharing control schemes; however, the size and weight are increased owing to the extra...
Three-phase shunt active power filter (APF) is often used to compensate the harmonic and reactive current derived from non-linear load. But many non-ideal factors, such as the limited bandwidth of output current loop and the time lag of signal sensing circuit and reference current generation etc, will deteriorate the compensation effect. Proportion-Integral (PI) controller cannot be used simply to...
With development of modern industry, more and more non-linear loads are used in power system, resulting in increasingly severe harmonic pollution. Harmonic becomes main factors affecting power quality. Active power filter, as the most effective method to eliminate harmonic, has been paid more and more attention recently. The current compensation performance of active power filter depends on the controller...
Compensating effect of three-phase shunt active power filters (APF) is totally decided by the design of controller. But many non-ideal factors, such as limited bandwidth of output current loop, the time lag of signal sensing circuit and generation of reference current etc, will deteriorate the compensation effect. Proportion-integral (PI) controller cannot be used simply to control the output current...
Active Power Filter (APF) is useful device to compensate the harmonics which are caused by the nonlinear load, and its performance index mainly depends on the parameter design and structure of controller. In order to solve this problem, new Hamilton model of active power filter is introduced and the Energy Shaping Control Principle is used to design controller which corrects the output current waveform...
Three-phase shunt active power filter (APF) is often used to compensate the harmonics and reactive current derived from nonlinear loads. But many non-ideal factors, such as the limited bandwidth of current control loop and the time lag of signal acquisition and reference current generation etc, will deteriorate the compensation effect. The traditional proportion-integral (PI) controller cannot be...
Active power filter (APF) is usually used to compensate the harmonic and reactive currents which are generated by the nonlinear load, and its compensation performance mainly depends on the design of controller. This paper mainly analyzes that the compensation ability of digital PI control is limited, and a multiple control system based on digital PI control and digital repetitive control is proposed...
This paper first established a mathematical model for the split-capacitor three-phase active power filter. Based on the precise mathematical model, it then proposed a control strategy under dq0 coordinate for the DC voltage control of APF, to control the d axis current for DC total voltage stability, to control the q axis current for DC voltage balance. Finally, simulation and experiment result proved...
In practical industry fields, harmonic, negative sequence current and reactive current need to be restrained to meet the requirements of consumers. The active power filter is a new brand power electronics device. In the three-phase unbalanced circuit, it can restrain the negative sequence fundamental current except for restraining harmonic. In order to restrain harmonic and negative sequence fundamental...
The islanding effect of utility-interactive photovoltaic (UIPV) system may cause hazards for the grid equipment, and even danger to grid personnel. Therefore, reliable islanding detection is one of the crucial factors to connect grid for UIPV system. Over the years, a number of research works have been concentrated on the techniques of non-detection zones (NDZ's), which determines the relative effectiveness...
This paper presents three models for the induction voltage adder (IVA) from a novel perspective. Firstly, it proposes a specific model based on the concept of transformer from analyzing the principle of the IVA injector. In a certain condition, the specific model can be predigested to a lumped element model. When the electrical transit time of the IVA is comparable to, or even longer than the pulse...
Three-phase shunt active power filter (APF) are often used to compensate the harmonic and reactive current derived from non-linear load. But many non-ideal factors, such as the limited bandwidth of output current loop and the time lag of signal sensing circuit and reference current generation etc, will deteriorate the compensation effect. Proportion-integral (PI) controller cannot be used simply to...
In this paper, a new DC current measuring method using current transformer is put forward in this design, which can both reducing the cost of current sensor component and fulfilling the requirement of current detecting, simply adding a diode and a resister. A digital controlled battery charger based on microprocessor for high power UPS application is also presented. A two-stage charging strategy along...
A three-phase three-wire shunt active power filter (APF) suitable for parallel operation is proposed in this paper to overcome difficulties in the field of high power applications. This APF can operate independently and compensate the load harmonic current according to its own capacity-limitation. Furthermore, the output current of each APF is optimized so that the APF with large capacity compensates...
In this paper, a digital controlled battery charger based on microprocessor for high power UPS application is presented. A two-stage charging strategy along with the control method is analyzed. A new DC current measuring method using current transformer is put forward in this design, which can both reducing the cost of current sensor component and fulfilling the requirement of current detecting, simply...
In this paper, a digital controlled battery charger based on microprocessor for high power UPS application is presented. A two-stage charging strategy along with the control method is analyzed. A new DC current measuring method using current transformer is put forward in this design, which can both reducing the cost of current sensor component and fulfilling the requirement of current detecting, simply...
A three-phase three-wire shunt active power filter (APF) suitable for parallel operation is proposed in this paper to overcome difficulties in the field of high power applications. This APF can operate independently and compensate the load harmonic current according to its own capacity-limitation. Furthermore, the output current of each APF is optimized so that the APF with large capacity compensates...
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