The present invention discloses a harmonic filter (1,2) for single-phase and three-phase alternating current installations using two coils (10, 11) arranged in series, each of which is helically wound around the same ferromagnetic core (9,9'), but in opposite winding directions, to filter the…
Some aspects of the present disclosure provide a harmonic reduce control system for controlling an inverter, including a phase-locked loop controller, a voltage sum loop controller, a repeative controller, a current loop controller, and a harmonic obtaining module. The harmonic obtaining module…
This document describes systems for and techniques of alternating-current (AC) power harmonic-based circuit state detection. In various aspects, a system includes a component, a bypass circuit for the component, and a controller with an AC power harmonic-based circuit state detector that can…
A power distribution system includes a variable frequency alternating current (AC) generator, an active rectifier electrically connected to the variable frequency AC generator such that AC power output from the variable frequency AC generator is rectified by the active rectifier, and a switching…
A controller system reduces destructive harmonic content within a power network system, the power network system comprising one or more distributed energy resources, one or more distributed inverter systems, one or more nonlinear loads, and a bus coupling the one or more distributed energy…
Disclosed are an electric power quality control method and device for an oil production platform, and a storage medium. The method includes: obtaining test data of electrical loads of power distribution rooms of an oil production platform, and determining electric power quality index data of each…
The disclosure relates to a power electronics device having at least two inverters and a transformer apparatus having a core arrangement, at least one primary winding and at least one secondary winding that wind around the core arrangement at least in sections.
A power conversion device includes a major circuit part converting a power of a distributed power source into AC power corresponding to a power system, and a controller controlling an operation of the major circuit part; the controller includes an estimated value calculation part and a reactive…
A ripple control method for a modular cascaded power conversion device is provided. The method obtains, according to a grid voltage vector of three-phase AC power, a second-order fluctuating voltage superposition vector representing the total amount of second-order fluctuating voltages on…
Systems and methods are described for active harmonics cancellation. A wireless charging apparatus includes a wireless-power transfer circuit comprising a wireless-power transfer coil configured to generate or couple to a magnetic field to transfer or receive power and a plurality of tuning…
[Problem to be solved] To achieve adjustment of an electric line based on indexes set separately for harmonic components having different orders in a current in the electric line. [Solution] A power control system causes a device to adjust apparent power in an electric line, and the power control…
A peer-to-peer power compensation architecture for utility power systems has a “ring-pathed” power transmission supply line with legs connecting a utility power source to a utility customer load, to a secondary power source, and to the utility customer load. A sinusoidal signal is injected on the…
Embodiments to systems and methods for tuning the control of a shunt active power filter over a variable frequency. In aspects, a shunt active power filter is provided to filter current harmonics from the output delivered to a dc load via a recitifier. The shunt active power filter control can be…
The photovoltaic power plant has photovoltaic modules (1) that are configured to generate an electric power. The photovoltaic modules are connected together to form several strands (2). A central converter (5) converts generated electric power into electrical energy whose voltage waveform…
An UPS system and a method of supplying power to a non-linear load are provided. The UPS system may include a bypass module (100) configured to supply a fundamental wave current to a non-linear load of the UPS system; and a power module (200) configured to supply a harmonic current to the…
The apparatus (400) for applying a torsional electromagnetic wave to a power line (300) is electrically isolated from a power source unit providing power to a load. The apparatus can be used regardless of the power supply system such as a single-phase electric system or a tri-phase electric system…
Control method for converting power in which a DC voltage is converted into alternating voltage, a first alternating voltage (AC1) and a second alternating voltage (AC2) being obtained by means of a first inverter (1) and a second inverter (2) respectively. Said alternating voltages (AC1, AC2) are…
The power filter module has an input unit that receives reference load currents and phase voltages of three-phase supply network (1) corresponding to a non-linear load (2). A transformation unit transforms the load currents and phase voltages in alpha-beta coordinate system. A control module…
Disclosed is a method for the improvement of the line quality in a system, in which a common feeding (1), via at least one distribution transformer (3), feeds at least two non-linear loads (11) drawing non-sinusoidal currents from the common feeding (1), wherein between the common feeding (1) and…
A system and method for managing power uses a power meter that is electronically connected to a first point on a multiphase power distribution system to measure power information at that point. It determines harmonic distortion and true power factor correction based on the power information, and…
A power supply device adapted for supplying electrical power to a load, comprises a first electrical generator (201) adapted for providing a first output current (301) having a first phase angle; at least a second electrical generator (202) adapted for providing a second output current (302) having…
A method of controlling the grid-side current of a single-phase grid-connected converter having an LCL filter connected between the output of the converter and the grid, the method comprising the steps of measuring a grid voltage (½ S ) and at least one signal in a group of signals comprising a…
A method for determining a fault in a power filter of a wind turbine generator, the method including the steps of: calculating a reactive power consumed by the power filter; and comparing the calculated reactive power to a predefined threshold reactive power to determine the fault. A system for…
EMCfilter, for connection between a supply network and a electric-operated appliance to reduce conduction noise between said supply network and said appliance, comprising virtual shunt nodes inductively coupled to the power line. Thisdisposition allows the realization of multi-stage filters without…
The reactive power regulation method uses a reactive power compensation device inserted between a generator driven by a wind-turbine and the electrical energy network and regulated for supplying electrical power to a load which has a reactive load component matched in phase, amplitude and/or…
A method in connection with a network inverter, an LCL network filter (3) being connected between the network inverter (1) and network (2), and the network inverter being arranged to operate as an active converter of harmonic components of electricity, and the method comprises the steps of forming…
The invention provides techniques for reducing or altering the magnetic noise of an AC rotary electric machine. A magnetic noise reducing harmonic current of order n, whose frequency is n times the frequency of the fundamental frequency component of a polyphase AC current fed to an armature of a…
The device has a drive unit coupled to a generator and connected via a rectifier to a d.c. intermediate circuit, a static converter connected to the intermediate circuit with multiple a.c. output connections and a filter arrangement connected to the a.c. output connections. The filter arrangement…
A power converter circuit for voltage maintenance in an alternating voltage supply network (1) is specified, wherein the alternating voltage supply network (1) has for each phase (R; S; T) an associated voltage source (UR; US; UT) for supplying an electrical load (2), wherein the power converter…
The circuit has a capacitance in parallel with the load, a single- or multi-phase transformer with a secondary in series with the capacitance and a main inductance selected to form a passive filter circuit for at least one harmonic, a current regulated single- or multi-phase converter supplying the…