A modular power flow control system having early detection and reporting of transmission line faults is described. The response time for closing a bypass switch and reporting the fault is less than 200 microseconds for hard faults, longer for soft faults. Reprogramming of distance relays is not required. Transmission line faults are characterized using a fault detection sensor suite, normally including at least a current sensor such as a current transformer and a rate of current change sensor such as a Rogowski coil, and in some embodiments, a temperature sensor. Other embodiments are disclosed.

A method controls power flow in an electrical supply network. The method includes: providing at least one power flow control device, providing a model of the electrical supply network for estimating the distribution of the power flow in the electrical supply network in accordance with predefined network parameters, and simulating the power flow in the network using the model such that a potential congestion path in the electrical supply network is identified. As a result of the simulation, a positioning scheme for the at least one power flow control device is provided, such that congestion in the identified potential congestion path can be avoided. The at least one power flow device is configured in accordance with the positioning scheme. The power flow in the supply network is controlled by means of the at least one power flow control device.

Provided are an insulation coordination method and system for a series compensation apparatus, a storage medium and an electronic device. The method includes determining a topology of a series compensation apparatus and a system parameter and an operation mode of an access system of the series compensation apparatus; performing overvoltage partitioning on the series compensation apparatus; constructing a simulated operating condition according to a plurality of overvoltage analysis areas and an operating condition; establishing an overvoltage simulation analysis model; performing a simulating calculation for different preset fault types according to the overvoltage simulation analysis model; determining the number of lightning arresters installed in each overvoltage analysis area and a continuous operating voltage value of each lightning arrester; and determining, according to a preset insulation coordination coefficient and the continuous operating voltage value of each lightning arrester, a safe operating voltage of the series compensation apparatus.

Provided are an insulation coordination method and system for a series compensation apparatus, a storage medium and an electronic device. The method includes determining a topology of a series compensation apparatus and a system parameter and an operation mode of an access system of the series compensation apparatus; performing overvoltage partitioning on the series compensation apparatus; constructing a simulated operating condition according to a plurality of overvoltage analysis areas and an operating condition; establishing an overvoltage simulation analysis model; in each overvoltage analysis area, performing a simulating calculation for different preset fault types according to the overvoltage simulation analysis model; determining the number of lightning arresters installed in each overvoltage analysis area and a continuous operating voltage value of each lightning arrester; and determining, according to a preset insulation coordination coefficient and the continuous operating voltage value of each lightning arrester, a safe operating voltage of the series compensation apparatus.

Distributed series reactance modules and active impedance injection modules that are adapted to operating with electric power transmission lines over a wide range of transmission voltages are disclosed. Key elements include a virtual ground, an enclosure that acts as a Faraday shield, radio frequency or microwave control methods and the use of corona rings.

A method can be used to determine a fault location in a power transmission line that connects a first terminal with a second terminal. Parameters associated with travelling waves are detected from measurements carried out at the first and second terminals. The parameters include arrival times of first and second peaks of the travelling waves at the first and second terminals respectively, and rise times of the first peaks of corresponding travelling waves. A first half, a second half, or a mid-point of the power transmission line is identified as having a fault based on the parameters. The fault location can be estimated based on the arrival times of the first and second peaks of the travelling waves detected from measurements carried out at the first and second terminals, a velocity of propagation of the travelling wave in the power transmission line, and/or a length of the power transmission line.

A device for controlling a load flow in an alternating-voltage network includes first and second modular series connections of double-pole switching modules interconnected in a parallel circuit to be inserted in series into a phase line of the alternating-voltage network. At least one switching module of each connection has an energy store and semiconductor switches to be switched on and off. The semiconductor switches can be controlled in such a way that a switching module voltage can be generated at terminals of the switching module. The switching module voltage corresponds to a positive or negative storage voltage or a zero voltage. A control apparatus for controlling the switching modules is configured to generate an equalizing current between the modular series connections. A method for controlling a load flow by using the device is also provided.

Systems and methods for efficient power conversion in a power supply in a power distribution system are disclosed. In particular, a low frequency transformer having high conversion efficiency is coupled to an input from a power grid. An output from the transformer is rectified and then converted by a power factor correction (PFC) converter before passing the power to the distributed elements of the power distribution system. By placing the transformer in front of the PFC converter, overall efficiency may be improved by operating at lower frequencies while preserving a desired power factor and providing a desired voltage level. The size and cost of the cabinet containing the power conversion circuitry is minimized, and operating expenses are also reduced as less waste energy is generated.

A method for detecting a voltage disturbance in a utility having a micro-grid. The method transforms current and voltage measurements into first and second voltage values and first and second current values in a stationary reference frame, and transforms the first and second voltage values and the first and second current values to third and fourth voltage values and third and fourth current values in a rotating reference frame, where the third voltage value defines an average magnitude of the three-phase power signals. The method multiplies the third current value by the third voltage value to obtain an instantaneous power value and multiplies the fourth current value by the third voltage value to obtain an instantaneous volt-ampere reactive (VAR) value. The method opens the switch if the VAR value has a magnitude above a predetermined value and a direction indicating the fault is outside of the micro-grid in the network.

A filter circuit for reducing feedback of a consumer on an energy supply is disclosed. This filter circuit includes a multipolar input, a line choke, and a multipolar output, wherein the input is configured to receive an AC voltage from the energy supply, wherein the output is configured to be connected to the consumer, wherein the line choke includes one coil for each pole of the input, and wherein the coils of the line choke are each connected between one pole of the input and one pole of the output and energy is transferred from the input to the output and/or vice versa. A resonant current suppression (RCS) group is connected in parallel to a coil of the line choke to transmit resonant currents arising at the line choke such that voltage increases generated by the resonant currents are reduced or suppressed by the at least one RCS circuit.