Abstract
Voltage sag and harmonic pollution have a serious impact on the medium-voltage premium-power-supply-required park represented by optical semiconductors, data storage, precision instruments and biopharmaceuticals. Which makes existing equipment require higher voltage capacity of power electronics, higher economic cost and compensation performance. In this paper, an Inductive Hybrid Unified Power Quality Conditioner (IH-UPQC), which is characterized as high integration, reduced DC-link voltage and satisfactory harmonic isolation of transformer, is presented to realize the bi-directional power quality improvement for medium-voltage premium-power-supply-required park. First, the three-phase equivalent circuit and mathematical model are established to reveal the mechanism of harmonic suppression and voltage regulation. Based on the theoretical analysis, the compound control strategy of series and shunt Hybrid Active Power Filter (HAPF) as well as the synchronous method sliding Goertzel discrete Fourier transformation-pre-filtering Phase Lock Loop (PLL) are designed. Then, the main circuit components design including Double Resonant Passive Filter (DRPF), L-C-R low pass filter and the special designed filtering winding for implementing inductive filtering method are described. Finally, the performance of IH-UPQC is validated in 10kV distribution network by MATLAB/Simulink. The simulation results demonstrate that the IH-UPQC is effective to perform grid voltage regulation, load harmonic current suppression and reactive power compensation.
Highlights
The extensive use of Nonlinear Load (NL) and increasing penetration of Renewable Energy Generation (REG) make the medium-voltage premium-power-supplyrequired park highly vulnerable to Power Quality (PQ) problems
Yu et al.: Inductive Hybrid Unified Power Quality Conditioner (IH-Unified Power Quality Conditioner (UPQC)) for PQ Management in Premium-Power-Supply-Required Applications in Fig.1 (a), it can be found that the load harmonic current flows into the special transformer and induces harmonic leakage flux in transformer, which inevitably causes a series of problems to the transformer, such as additional iron and copper losses, noise, vibration and temperature rise, etc
For this typical wiring scheme, the UPQC is effective in isolating harmonics away from public grid and maintaining a regulated load voltage, but it cannot mitigate the negative effects of harmonics on the transformer
Summary
The extensive use of Nonlinear Load (NL) and increasing penetration of Renewable Energy Generation (REG) make the medium-voltage premium-power-supplyrequired park highly vulnerable to Power Quality (PQ) problems. In Fig. (a), it can be found that the load harmonic current flows into the special transformer and induces harmonic leakage flux in transformer, which inevitably causes a series of problems to the transformer, such as additional iron and copper losses, noise, vibration and temperature rise, etc For this typical wiring scheme, the UPQC is effective in isolating harmonics away from public grid and maintaining a regulated load voltage, but it cannot mitigate the negative effects of harmonics on the transformer. The series APF is controlled as a non-sinusoidal voltage source to tackle all voltage-related problems for the load, such as voltage harmonics, voltage unbalance, and voltage sag/swell Benefited from this integrated configuration, the IH-UPQC inherits the advantages of traditional UPQC, i.e., it suppresses harmonics and compensates reactive power for grid (bus A), and ensure a regulated load voltage for NL/REG (bus B). The series APF utilizes voltage feedback and current feedforward scheme to regulate deviated load voltage
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