A method for providing grid-forming control of an inverter-based resource includes monitoring the electrical grid for one or more grid events. The method also includes controlling, via a power regulator of a controller, an active power of the inverter-based resource based on whether the one or more grid events is indicative of a severe grid event. In particular, when the one or more grid events are below a severe grid event threshold, thereby indicating the one or more grid events is not a severe grid event, the method includes controlling, via the power regulator, the active power according to a normal operating mode. Further, when the one or more grid events exceed the severe grid event threshold, thereby indicating the one or more grid events is a severe grid event, the method includes controlling, via the power regulator, the active power according to a modified operating mode. Moreover, the modified operating mode includes temporarily re-configuring the power regulator to reduce or eliminate power overloads induced by the severe grid event for as long as the one or more grid events exceed the severe grid event threshold.

A system may be provided that may include a first battery, and an inverter coupled to the battery. The system may also include a first active filter including a first switch element, second switch element, third switch element, and fourth switch element. Each switch element may be coupled to the first battery or the inverter. The first, second, third, and fourth switch elements may be configured to increase or decrease an applied voltage or current of the first battery.

A frequency converter, includes: a DC link, wherein the DC link has a first connection pole at which a positive link potential is present during operation of the frequency converter, and a second connection pole at which a negative link potential is present during operation of the frequency converter; an inverter, wherein the inverter has a first connection pole at which a positive inverter potential is present during operation of the frequency converter, and a second connection pole at which a negative inverter potential is present during operation of the frequency converter; a resistive shunt which is looped in between the first connection pole of the DC link and the first connection pole of the inverter; a differential amplifier which is designed to generate a test voltage from a potential difference across the resistive shunt; and an evaluation unit which is designed to detect a ground fault based on the test voltage.

An electrical power converter (1, 1′, 1″) includes a DC link capacitor (3, 3′, 3″) configured for connection to a DC power source to provide an input load, at least one pair of semiconductor switches (2a, 2b, 2c, 2a′, 2b′, 2a″, 2b″) connected in parallel with the DC link capacitor (3, 3′, 3″) and positioned on either side of an output load terminal (10a, 10b, 10c, 10a′, 10b′, 10a″, 10b″). The electrical power converter (1, 1′, 1″) further includes an inductive current sensor (12, 12′, 12″), arranged to sense a primary current from a terminal of the DC link capacitor (3, 3′, 3″), and a detection circuit (14), connected to the inductive current sensor (12, 12′, 12″) and arranged to monitor for an over-current condition, and to produce an output which causes at least one of the pair of semiconductor switches (2a, 2b, 2c, 2a′, 2b′, 2a″, 2b″) to be switched to a non-conducting state when an over-current condition is detected.

A method performed by a control system of a power electronics converter. A first part of a grid-side current controller runs a first feedback control algorithm having a first control cycle time and includes at least proportional control using a proportional gain. A third part of the controller runs a third feedback control algorithm having the first control cycle time and acting on an output from the first control algorithm after SOA limits have been applied and includes counteracting the proportional control of the first feedback control algorithm. A second part of the controller runs a second feedback control algorithm having a second control cycle time, less than the first control cycle time, and acting on an output from the third control algorithm with the same polarity as the first control algorithm and includes proportional control using the proportional gain.

A power converter is configured to measure an output current and to determine a multi-phase voltage reference as a function of the output current. Within the same switching period the voltage reference is determined, a modulation routine determines a modulation index for each phase of the output voltage. In some instances, one or more phases must start modulation during the switching period before the new modulation index is determined. The modulation routine stores the value of the modulation index generated from the prior switching period and uses the stored value when a new value is not yet ready. An offset value for the phase voltage which used a modulation index from the prior switching period is determined in order to compensate the phase voltages of the other phases and to maintain a desired line-to-line voltage output from the power converter.

A motor drive control device controls driving of a motor by performing PWM control of turning on-off of an arm switching element of a PWM inverter outputting a three-phase AC voltage to the motor, and detects current values of respective phases of the three-phase AC voltage. The motor drive control device turns off a lower arm switching element for a largest phase by causing a first PWM pulse based on a largest phase voltage command and a carrier signal throughout an entire first period during which the carrier signal rises or falls to be at a low level. The motor drive control device turns on a lower arm switching element for a smallest phase by causing a second PWM pulse based on a smallest phase voltage command and the carrier signal throughout an entire second period during which the carrier signal rises or falls to be at a high level.

A basic unit for a power converter, a power converter, and a universal power interface are disclosed. The basic unit includes an inductor, a power half-bridge, a first terminal, a second terminal, a third terminal, and a fourth terminal, where an end of the inductor is connected to a midpoint of the power half-bridge, and the other end of the inductor is connected to the first terminal; a source terminal of a lower bridge arm of the power half-bridge is connected to the second terminal and the fourth terminal; and a drain terminal of an upper bridge arm of the power half-bridge is connected to the third terminal. The manufacturing costs of a microgrid system and the difficulty of later maintenance can be reduced.

A semiconductor module may include a plurality of semiconductor elements; and a first power terminal, a second power terminal and a third power terminal electrically connected to the plurality of semiconductor elements. The plurality of semiconductor elements may include at least one upper arm switching element electrically connected between the first power terminal and the second power terminal; and at least one lower arm switching element electrically connected between the second power terminal and the third power terminal. A number of the at least one upper arm switching element may be different from a number of the at least one lower arm switching element.

This multi-phase converter control device performs PWM control on driving of a multi-phase converter. The multi-phase converter is configured such that a plurality of converters connected to each other in parallel have reactors, and the reactors are magnetically coupled with each other and step up an input voltage to generate a step-up voltage. This multi-phase converter control device includes a feedback control unit configured to perform feedback control such that the step-up voltage is a target voltage, a PWM control unit configured to generate a PWM signal on the basis of a voltage command value output from the feedback control unit, and a drive unit configured to drive the multi-phase converter on the basis of the PWM signal. The feedback control unit calculates a step-up ratio of the multi-phase converter and changes a control gain in the feedback control on the basis of the step-up ratio.