Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for obtaining a model of an electrical power system including multiple subcircuits. Assigning each of multiple subcircuits to a processing core from among multiple processing cores employed for simulation of the model; executing a simulation of electric grid behaviors of the model, where the simulation of each subcircuit can be executed by the respective processing core assigned to the subcircuit. Sending a message, from a first processing core assigned to a first subcircuit to a second processing core assigned to a second subcircuit, the message including one or more boundary conditions at an interface between the first subcircuit and the second subcircuit in the model.

Abstract: Methods, systems, and apparatus, including medium-encoded computer program products, for selecting, from a unified electrical power grid model, a first proper subset of elements of the model. A first electrical grid simulation model is selected. A second, differing proper subset of elements of the model are selected. A second electrical grid simulation model that differs from the first electrical grid simulation model is selected. A set of boundary conditions common to the first electrical grid simulation model and the second electrical grid simulation model are determined. Operation of the electrical power grid is simulated, and can include (i) simulating, using the first electrical grid simulation model, the first proper subset of elements of the unified model, and the set of boundary conditions; and (ii) simulating, using the second electrical grid simulation model and the second proper subset of elements of the unified model, and the set of boundary conditions.

Abstract: Methods, systems, and apparatus, including medium-encoded computer program products, for cloud-based electrical grid component validation can include obtaining a computer model of an electric power grid. The computer model can include asset models for individual assets connected to the electric power grid. Each asset model can be configured to replicate operation of a corresponding type of physical electric grid asset. A first asset model can include a hardware emulator configured to execute firmware specific to the corresponding type of physical electric grid asset. Altered firmware for the first asset model can be received. The computer model can be processed using a simulation engine to obtain simulation results, and the simulation engine can be configured to simulate operation of the individual assets of the computer model including operation of the first asset model according to the altered firmware associated with the first asset model. Simulation results can be provided.

Abstract: A clamping circuit employs a filter comprising two series branches of surge arresting circuits to clamp voltage spikes on equipment in series with a power transmission line. Clamping of these voltage spikes protects insulators, semiconductors, and other sensitive components within the series equipment from transient grid events. By using a predetermined frequency to control the response, the filter does not interfere with normal operation of the power system nor the operation of a power flow control module series-coupled to the transmission line through the filter. The clamping circuit employs hysteresis and imposes a shared voltage ratio between the two circuit branches, the ratio depending on frequency and voltage of the transient asserted on the transmission line, in order to provide a very sharp protection response to events within the target frequency range.

Abstract: A fault detection system has line current monitors. Each line current monitor couples to a line-phase of an electric power transmission system. Each line current monitor has a phase detector, a loop filter and a controlled oscillator, coupled as a phase locked loop. The phase detector has a rotating frame transform. The phase detector couples to a line-phase and provides in-phase and quadrature signals in a rotating frame, based on in-phase and quadrature signals proportional to current in the line-phase. One or more fault detection modules are coupled to the line current monitors through inter-phase communication of the in-phase and quadrature signals in a time frame rotating at the line frequency. The communication may have electrical isolation.

Abstract: Disclosed is a reactance-injecting module and its method of use to balance the currents among the phases of polyphase electric power transmission lines or to manage power flow among alternate paths, where the reactance-injecting module has high-speed, dedicated communication links to enable the immediate removal or reduction of injected reactance from all phases of a phase balancing cluster when a fault is detected on any one of the multiple phases. The reactance-injecting module may communicate information on a detected fault to the other reactance-injecting modules of the phase balancing cluster within 10 microseconds after the fault is detected to allow the phase balancing cluster to eliminate injected reactance from all phases within a time that is short compared to a cycle of the alternating current, such as 1 millisecond after the fault is detected. This provides extremely fast neutralization of injected reactance to minimize interference with fault localization analyses.

Abstract: A circuit comprises a power source, an Open Loop Reactance Matching Circuit Control Signal Generator (OLRMCCSG), an Open Loop Reactance Matching (OLRM) circuit, and a load. The power source supplies an input voltage and an input current used to drive the load. The load is an inductive type load or a capacitive type load. If the power source operates as a voltage source, then the OLRMCCSG uses input voltage information to control the OLRM circuit to generate a reactance matching voltage that is phase delayed with respect to the input voltage. If the power source operates as a current source, then the OLRMCCSG uses input current information to control the OLRM circuit to generate a reactance matching current that is phase delayed with respect to the input current. The reactance matching voltage or the reactance matching current causes the input voltage and the input current to be in phase.

Abstract: A filter network is insertable into a power transmission line, to handle disturbances in the power transmission line. A first circuit has an RC network in parallel with a surge arrestor, to bypass high frequency disturbances of the power transmission line. A second circuit has inductors for carrying low-frequency power to and from impedance injection units.

Abstract: The presence of injected DC has harmful consequences for a power grid system. A piecewise sinusoidal ripple voltage wave at the line-frequency that rides on the main capacitor bank of the power converter is observed. This observation leads to a new detection method and mitigation method. A two-stage control circuit is added to the operation of a power converter that controls power line impedance in order to mitigate the injected DC and to block DC circulation. This control computes a correction angle to adjust the timing of generated pulsed square waves to counter-balance the ripple. A functional solution and the results of experiments are presented. Furthermore, an extraction method and three elimination methods for this ripple component are presented to allow dissipation of DC energy through heat and/or electronic magnetic wave, or to allow transformation of this energy into usable power that is fed back into the power grid.

Abstract: A fault detection system has line current monitors. Each line current monitor couples to a line-phase of an electric power transmission system. Each line current monitor has a phase detector, a loop filter and a controlled oscillator, coupled as a phase locked loop. The phase detector has a rotating frame transform. The phase detector couples to a line-phase and provides in-phase and quadrature signals in a rotating frame, based on in-phase and quadrature signals proportional to current in the line-phase. One or more fault detection modules are coupled to the line current monitors through inter-phase communication of the in-phase and quadrature signals in a time frame rotating at the line frequency. The communication may have electrical isolation.

Abstract: The presence of injected DC has harmful consequences for a power grid system. A piecewise sinusoidal ripple voltage wave at the line-frequency that rides on the main capacitor bank of the power converter is observed. This observation leads to a new DC detection elimination method. Three DC elimination methods for this ripple component are disclosed to allow dissipation of DC energy through heat and/or electromagnetic wave, or to allow transformation of this energy into usable power that is fed back into the power grid.

Abstract: A filter network is insertable into a power transmission line, to handle disturbances in the power transmission line. A first circuit has an RC network in parallel with a surge arrestor, to bypass high frequency disturbances of the power transmission line. A second circuit has inductors for carrying low-frequency power to and from impedance injection units.

Abstract: A system includes a power source, a transmitter circuit, a conductor, and a receiver circuit. The transmitter circuit is supplied by the power source and wirelessly supplies the receiver circuit via the conductor. The conductor includes a plurality of distributed capacitances coupled in series with the conductor. The receiver circuit includes a primary coil and a secondary coil. The primary coil has at least two turns and includes a plurality of distributed capacitances. The transmitter circuit includes an Open Loop Reactance Matching (OLRM) control circuit, a first inverter, a second inverter, and a third inverter. The OLRM control circuit controls the first inverter to generate a high frequency AC voltage to be supplied to the conductor. During wireless power transfer, the OLRM control circuit performs reactance matching by controlling the second and third inverters to maintain the transmitter voltage and current in phase without requiring any feedback sensing.

Abstract: Disclosed is a reactance-injecting module and its method of use to balance the currents among the phases of polyphase electric power transmission lines or to manage power flow among alternate paths, where the reactance-injecting module has high-speed, dedicated communication links to enable the immediate removal or reduction of injected reactance from all phases of a phase balancing cluster when a fault is detected on any one of the multiple phases. The reactance-injecting module may communicate information on a detected fault to the other reactance-injecting modules of the phase balancing cluster within 10 microseconds after the fault is detected to allow the phase balancing cluster to eliminate injected reactance from all phases within a time that is short compared to a cycle of the alternating current, such as 1 millisecond after the fault is detected. This provides extremely fast neutralization of injected reactance to minimize interference with fault localization analyses.

Abstract: A system includes a power source, a transmitter circuit, a conductor, and a receiver circuit. The transmitter circuit is supplied by the power source and wirelessly supplies the receiver circuit via the conductor. The conductor includes a plurality of distributed capacitances coupled in series with the conductor. The receiver circuit includes a primary coil and a secondary coil. The primary coil has at least two turns and includes a plurality of distributed capacitances. The transmitter circuit includes an Open Loop Reactance Matching (OLRM) control circuit, a first inverter, a second inverter, and a third inverter. The OLRM control circuit controls the first inverter to generate a high frequency AC voltage to be supplied to the conductor. During wireless power transfer, the OLRM control circuit performs reactance matching by controlling the second and third inverters to maintain the transmitter voltage and current in phase without requiring any feedback sensing.

Abstract: Disclosed is a reactance-injecting module used to balance the currents among the phases of polyphase electric power transmission lines or to manage power flow among alternate paths, where the reactance-injecting module has high-speed, dedicated communication links to enable the immediate removal of injected reactance from all phases of a phase balancing cluster when a fault is detected on any one of the multiple phases. The reactance-injecting module may communicate information on a detected fault to the other reactance-injecting modules of the phase balancing cluster within 10 microseconds after the fault is detected to allow the phase balancing cluster to eliminate injected reactance from all phases within 1 millisecond after the fault is detected. This provides extremely fast neutralization of injected reactance to minimize interference with fault localization analyses.

Abstract: A system includes a power source, a transmitter circuit, a conductor, and a receiver circuit. The transmitter circuit is supplied by the power source and wirelessly supplies the receiver circuit via the conductor. The conductor includes a plurality of distributed capacitances coupled in series with the conductor. The receiver circuit includes a primary coil and a secondary coil. The primary coil has at least two turns and includes a plurality of distributed capacitances. The transmitter circuit includes an Open Loop Reactance Matching (OLRM) control circuit, a first inverter, a second inverter, and a third inverter. The OLRM control circuit controls the first inverter to generate a high frequency AC voltage to be supplied to the conductor. During wireless power transfer, the OLRM control circuit performs reactance matching by controlling the second and third inverters to maintain the transmitter voltage and current in phase without requiring any feedback sensing.

Abstract: 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.

Abstract: The presence of injected DC has harmful consequences for a power grid system. A piecewise sinusoidal ripple voltage wave at the line-frequency that rides on the main capacitor bank of the power converter is observed. This observation leads to a new detection method and mitigation method. A two-stage control circuit is added to the operation of a power converter that controls power line impedance in order to mitigate the injected DC and to block DC circulation. This control computes a correction angle to adjust the timing of generated pulsed square waves to counter-balance the ripple. A functional solution and the results of experiments are presented. Furthermore, an extraction method and three elimination methods for this ripple component are presented to allow dissipation of DC energy through heat and/or electronic magnetic wave, or to allow transformation of this energy into usable power that is fed back into the power grid.

Abstract: The presence of injected DC has harmful consequences for a power grid system. A piecewise sinusoidal ripple voltage wave at the line-frequency that rides on the main capacitor bank of the power converter is observed. This observation leads to a new DC detection elimination method. Three DC elimination methods for this ripple component are disclosed to allow dissipation of DC energy through heat and/or electromagnetic wave, or to allow transformation of this energy into usable power that is fed back into the power grid.