Abstract
Renewable energy sources; which are abundant in nature and climate friendly are the only preferable choice of the world to provide green energy. The limitation of most renewable energy sources specifically wind and solar PV is its intermittent nature which are depend on wind speed and solar irradiance respectively and this leads to power fluctuations. To compensate and protect sensitive loads from being affected by the power distribution side fluctuations and faults, dynamic voltage restorer (DVR) is commonly used. This research work attempts to withstand and secure the effect of voltage fluctuation of grid connected hybrid PV-wind power system. To do so battery and super magnetic energy storage (SMES) based DVR is used as a compensating device in case of voltage sag condition. The compensation method used is a pre-sag compensation which locks the instantaneous real time three phase voltage magnitude and angle in normal condition at the point of common coupling (PCC) and stores independently so that during a disturbance it used for compensation. Symmetrical and asymmetrical voltage sags scenario are considered and compensation is carried out using Power System Computer Aided Design or Electro Magnetic Transient Design and Control (PSCAD/EMTDC) software.
Highlights
The energy demand of the world increased by 2.9% for the last year and that is almost double of the last ten years average energy demand which is 1.5% per year [1]
SIMULATION RESULTS AND DISCUSSIONS To test the performance of the proposed battery energy storage (BES)-super magnetic energy storage (SMES) based dynamic voltage restorer (DVR) system for photo voltaic (PV)-wind hybrid energy sources as shown in Fig. 4 with its parameters described in Table 2, simulation is carried out using PSCAD/ EMTDC
The proposed DVR targets to protect the sensitive load from being affected by any voltage fluctuation which arise either from fault condition or unstable power output of PV-wind system
Summary
The energy demand of the world increased by 2.9% for the last year and that is almost double of the last ten years average energy demand which is 1.5% per year [1]. When Vpu at the PCC is under the normal value (voltage sag condition), the DVR will inject and compensate the missing voltage using the HES devices and during over Vpu value (voltage swell condition), the DVR will absorb the excess voltage to be stored in its HES so that the load voltage will be constant and within the standard value Based on the status of the BES and SMES devices, the overall BES-SMES based DVR will operate in these three states
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