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This paper deals with a windowing factor based control algorithm for a grid integrated SPV (Solar Photovoltaic) system. The proposed SPV system is able to handle the unpredictability of solar PV insolations and nonlinear loads at PCC (Point of Common). In its first stage, a DC-DC boost converter is used for extracting the maximum energy from the solar PV array. The boost converter is controlled by...
In this paper, cascaded H-bridge multilevel inverter (CHBMLI) based distribution static compensator (DSTATCOM) has been proposed. Synchronous reference frame theory (SRFT) based indirect current control is employed to extract the reference current. The instantaneous error in between the reference current and output current is processed through multiband hysteresis current controller (MHCC) for inner...
The neutral-point potential control is very difficult for the NPC three-level converter. This paper proposes an accurate model of the NPC three-level converter with parametric perturbation. The developed model mathematically describes that the basic reason for the neutral-point potential drift is the unbalanced distribution of active power caused by parametric perturbation. By injecting zero-sequence...
This paper presents a non-linear control scheme for power-factor-correction rectifiers. Based on the dynamic model of a power-factor-correction boost rectifier, a control algorithm is deduced by imposing a desired linear dynamics in the output-voltage. The proposed scheme has shown its fast dynamic response of the output-voltage, excellent voltage regulation, insensitive to load variations and the...
To interconnect solar photovoltaic (PV) with the single phase grid, DC/AC inverters are used as interface. For tracking maximum power from each solar PV string, DC/DC converters are connected between solar PV strings and inverters. This ensures each strings operates at its maximum power output irrespective of variation in solar radiation among different strings. Conventionally, DC-DC converter used...
This paper has presented the control strategy of Space Vector Pulse Width Modulation in over-modulation range by contrast. Based on the three-level inverter vector control theory, the cause of over-modulation generated is explained. Several typical over-modulation control strategies are summarized in detail, such as typical dual-mode strategy, typical single-mode strategy, the minimum phase angle...
This paper investigates the integrated 3-Phase AC-DC Buck-Boost converter designed to works with a great range of input AC voltages and produce a great range of output DC voltages which is similar to Conventional Converter with a sophisticated control in input section. The reduced switch converter with input Filter see through per phase voltage instead of Line voltage as in case of Conventional Converter...
Modular multilevel converter (MMC) is regarded as one of the most promising topologies for the high-voltage high-power applications. However, reliability is one of the most important challenges for MMC which is composed of a large number of power electronics sub-modules (SMs). In order to increase the system reliability, redundant SMs are often utilized. A strategy is proposed in this paper to implement...
An application of an input current harmonic filtering technology, namely power semiconductor filter (PSF), for conventional flyback AC/DC converter will be presented. By connecting a series-pass device (SPD) in series with the input of the flyback converter, the input current of the entire system has the waveform profiled to be in phase with the supply voltage and its magnitude adjusted to perform...
This paper presents a neutral point deviation compensating control algorithm applied to a 3-level NPC converter. The neutral point deviation is analyzed with a focus on the current flowing out of or into the neutral point of the dc-link. Based on the zero sequence components of the reference voltages, this paper analyzes the neutral point deviation and balancing control for 3-level NPC converter....
Ac transmission line emulator is the bridge to interconnect ac systems to fulfill the grid emulation function, where all the emulator elements such as generators, loads and lines are implemented by universal three-phase voltage source converters. In this paper, three design issues are addressed. First, the impact of ac voltage switching noise on the performance of a transmission line emulator in terms...
There has been a growing demand of using multi-function inverters for grid-connected systems applied to nonconventional energy sources, such as solar, wind and so on. In addition to power quality conditioning, the inverter can also be used for bidirectional active power exchange with a three-phase four-wire grid. Therefore, the inverter acts as a multi-function compensator. The functions of the proposed...
Critical conduction mode(CRM) Buck power factor correction(PFC) with peak current-controlled of currentmode control, its traditional control is constant on-time control, the switching frequency varies with the input voltage and load variations, and a relatively large frequency range, lead to a large of switching loss. This paper proposes a variable on-time control strategy for a CRM Buck PFC converter...
The single phase multilevel inverter with a battery balance unit strategy is presented. Every input of inverters which are in system is directly connected to battery. And the output of all batteries that is unification of all batteries voltage can controlled battery voltage to fulfil battery balancing intent. In this topology the inverter is design as well as fulfilled to operate as a battery balancing...
Most of the AC-DC systems include an AC DC converter for power factor correction followed by an isolated DC-DC converter. AC-DC converters will introduce harmonics to the input current waveform as it contains nonlinear elements, so a suitable control technique is required to smoothen the input current to reduce harmonics. For high power applications, Bridgeless interleaved (BLIL) AC-DC converter is...
Mechanically switched capacitors (MSC) are very well known reactive power compensation devices which are extensively in use in power transmission systems. However, during switching of MSC in a high voltage grid, significant transients are found to appear across the capacitor bank bus as well as different elements of MSC which may lead to insulation degradation affecting the long term performance of...
The article is concerned with regulating characteristics of the voltage and power solid-state regulator (VPSSR) and its electromagnetic compatibility in the medium voltage network. The paper describes VPSSR operating principle and its features. The VPSSR two-zone sequential operation with synchronization times of zero-crossing voltage method is researched. Control algorithms with power circuit compatibility...
Hybrid and Modular Multilevel converters are becoming an alternative to the conventional drive topology in industrial sector due to its reliability in operation, quality of output power, fault tolerant capability and flexibility in enhancement. However, the advancements of multilevel topologies in portable, isolated power supply electric system is immature due to the restriction of independent power...
This paper describes the closed loop space vector modulation strategy for Active Front End Converter (AFC). Low value of Power factor and excessive harmonic content are major disadvantages of conventional converter. To alleviate this problem, Carrier-Based-Sinusoidal Pulse Width Modulation (CB-SPWM) can be implemented in PWM converter; Narrow range of linear operation of converter is limitation of...
This paper presents the performance of single-phase modular cascaded H-Bridge five level inverter for grid-tie photovoltaic applications. Two H-Bridge cells are cascaded, each cell connected to a string of PV panels. The control scheme adopted maximizes the power transferred from the PV cell to the utility, via the grid, generates a sinusoidal current with minimum harmonic distortion, which is fed...
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