Marcin Jarnut

AC/DC/DC Interfaces for V2G Applications—EMC Issues

Presented in this paper are the results of research connected with common mode (CM) interference generated by ac/dc/dc power electronic interfaces, which will very probably be commonly used in the future vehicle-to-grid systems. The results obtained show that the conducted CM interference generated by these converters in a low-voltage grid can be coupled to a medium-voltage (MV) network and observed at distant points under overhead MV lines. The developed passive CM voltage compensator dedicated for ac/dc/dc interfaces is recommended as an effective method for conducted interference reduction, preventing both aggregation and flow of interference in distant circuits.

Hybrid Voltage Sag\/Swell Compensators: A Review of Hybrid AC\/AC Converters

The parameters of electrical energy, such as supply voltage amplitude, are very important, especially from the viewpoint of the final consumer with respect to sensitive loads connected to the grid. Dynamic states in the power grid-voltage sags and swells-might cause faults and defects to develop in sensitive loads. To mitigate unwanted effects, many topologies of ac/ac converters are implemented as voltage compensators. This article presents a review of hybrid ac/ac converters designed to compensate voltage sags and swells with the aim of protecting sensitive loads against sudden and severe changes in supply voltage amplitude. In this article, only solutions without galvanic separation between source and load are described. To assess the properties and to compare different topologies of voltage compensators, some common parameters, such as range of voltage sag and swell compensation, reliability, quantity of switches and transformers, and required power ratings of power electronic units in relation to power of load, are introduced. In addition, we discuss possibilities for compensation of voltage interruption, time of compensation, the efficiency, and the effect on the supply network of the described circuits. The results of the analysis have been collected and compared in tabular form and represented in graphical form. Furthermore, we show potential areas of application for particular solutions of ac voltage compensators.

Compensation of CM voltage in interfaces for LV distributed generation

In this paper the results of research connected with common mode (CM) interference generated by four-quadrant frequency converters and effective methods of CM voltage compensation will be presented. The results obtained show that conducted CM interference generated by these converters in a low voltage (LV) grid can be transferred by means of parasitic couplings into a medium voltage (MV) network and can be observed at distant points under overhead MV lines.

Power quality conditioners with minimum number of current sensor requirement

The paper introduces power quality conditioners with minimum number of current sensors. The power balance method for active conditioners control is introduced as well. Some investigation results of implemented solution are depicted to prove effectiveness of proposed arrangements.

Exercise bike powered electric generator for fitness club appliances

A generator powered by a stationary bicycle for the purposes of generating electricity for fitness club appliances is considered. A generator is connected to a stationary bicycle in such a way as the circular rotation of the front wheel rotates the coils of wires inside the generator between the poles of the magnets inside the generator. The resulting Direct Current is channeled to the attached battery bank and converted into different usable DC voltage levels as well as AC voltage, just to increase the number of electrical appliances possible to connect.

Power electronics interfaces for low voltage distribution generation — EMC issues

In recent years there is observed an intensive growth of activities in matter of bidirectional electrical energy distribution systems. In situation of fast industrial progress the Electrical Power System (EPS) has to be developed to meet energy demand. This development in accordance to new environmental requirements [1] should be managed very cleaver. Because of these the participation of small renewable and clean energy sources in over all Energy Mix is still growing and is restricted by national and international legislations [2, 3]. These small electrical energy sources dispersed in EPS called as Distributed Generation (DG) are the one of most significant part of the future grids — Smart Grids [4]. Although many issues have been widely discussed and solved [5–6] the number of tasks for consideration has not been reduced. This paper introduces some investigation results of DG interfacing with Low Voltage Distribution System (LVDS) using Power Electronics Interfaces (PEI). The EMC phenomena generated by power electronics inverters has been especially considered.

Transformerless 1-phase active power line conditioners

Paper proposes based on inverse /spl Gamma/ topology transformerless 1-phase active power line conditioners (APLC), the multiple capabilities of which include current conditioning and voltage restoring. The effectiveness of the 1-phase APLC is carefully outlined, while the systems general performance and flexibility are intensively investigated. Experimental results of a prototypes are presented to validate proposed approach.

Application of Stochastic Decentralized Active Demand Response (DADR) System for Load Frequency Control

The basic idea of decentralized demand response systems is not new, however, material presented in the subject matter literature is usually limited to general ideas and possible system services. In this paper, the original stochastic decentralized active demand response (DADR) system is presented in the form of an application-ready control algorithm. The results of simulation investigations have confirmed that the proposed stochastic DADR solution, because of its high dynamic response in dealing with disturbance phenomena, might be used as part of both the primary and the secondary load frequency control in electrical power systems. The applicability of the proposed algorithm for control of refrigerators has been numerically tested for various system parameters. Fulfillment of all assumed DADR system requirements concerning high dynamic, “soft” operation, fair share in service as well as minimization of degradation in comfort of use of DADR controlled devices have been confirmed in numerical evaluations.

Properties, simulation and experimental investigation of the series-parallel active power filters

In this paper introduced calculate method of active power filters passive components, simulation and experimental researches results of the series-parallel active power filter. Authors especially occupy oneself with analysis power flow between both active filters in UPQC system and nonlinear load. This problem is according to authors very important, because it makes possible to find optimum configuration of the hybrid UPFC and power of the additional sources elements

CM voltage compensator for DC/DC converters

DC/DC converters provide important services, however pulse mode operation introduces high frequency currents to the system that might cause electromagnetic compatibility (EMC) related problems. Moreover, as is shown in the paper, connection of the DC/DC converters can bring about aggregation of the resulting electromagnetic interference (EMI) currents. The main goal of the paper is to present a novel method to enable compensation of the voltage source of interference, reducing amplitude of EMI current and preventing aggregation of EMI currents produced by a group of converters.