There is provided a switching valve for a voltage source converter, the switching valve including a number of modules, each module including at least one switching element and at least one energy storage device, the or each switching element and the or each energy storage device in each module arranged to be combinable to selectively provide a voltage source, the switching valve including a controller programmed to selectively control the switching of the switching elements to select one or more of the modules to contribute a or a respective voltage to a switching valve voltage.

A power supply system includes an alternating current sweep unit and a first power supply circuit, and each of a U-phase battery string, a V-phase battery string, a W-phase battery string, and a first battery string includes a plurality of battery circuit modules connected in series, and each of the battery circuit modules includes a battery, output terminals, a first switch, and a second switch.

A power supply system comprises an alternating-current sweep unit that outputs alternating-current power from a U-phase battery string, a V-phase battery string, and a W-phase battery string that are Y-connected, a first power supply circuit that converts output of a direct-current sweep unit to alternating-current power using an inverter and outputs the alternating-current power, the direct-current sweep unit including a first battery string; and a control device. An energy density of a battery included in the U-phase battery string, the V-phase battery string, and the W-phase battery string is higher than an energy density of a battery included in the first battery string.

A power conversion circuit having a solid-state circuit breaker integrated therein is disclosed. With a disconnect switch between a utility source and the power conversion apparatus described for meeting UL489, the power conversion circuit includes an input connectable to an AC source, a rectifier circuit connected to the input to convert an AC power input to a DC power, and a DC link coupled to the rectifier circuit to receive the DC power therefrom. The rectifier circuit comprises a plurality of phase legs each including thereon an upper switching unit and a lower switching unit, wherein at least one of the upper and lower switching units on each phase leg comprises a bi-directional switching unit that selectively controls current and withstands voltage in both directions, so as to provide a circuit breaking capability that selectively interrupts current flow through the rectifier circuit, while maintaining original power conversion functionalities.

A three-phase converter and a control method thereof are provided. The three-phase converter includes an AC terminal, three filter circuits, three bridge arm circuits, a capacitor module and a DC terminal connected in sequence and a controller. The midpoints of the filter circuits are connected to the midpoint of the capacitor module. The controller controls each bridge arm circuit to work in the first and second modes at different time in one line voltage cycle of the AC source. In the first mode, the bridge arm circuit works in a clamping state. In the second mode, the bridge arm circuit selectively works in a DCM mode or a TCM mode. A switching frequency is limited to be lower than a preset frequency. When the three-phase converter works with over 80% of a rated load, a time length of working in the second mode is ⅓˜⅔ of the line voltage cycle.

In brief, the invention relates in particular to a converter (100) comprising a plurality of rectifier arms (110), making it possible in particular to rectify AC electrical signals available on the electrical phases (U, V, W) of an electrical grid. To balance the electrical signals coming from the electrical phases (U, V, W) of the electrical grid, and to limit a modulation amplitude of the DC signal generated by the converter (100) between its output terminals (S1, S2), the converter (100) also comprises a correction arm (120) that determines an amplitude of electric current flowing in a neutral (N) of the electrical grid and that generates an opposing electric current of equal or if not close amplitude. The invention also relates to a two-way charger (10) comprising such a converter (100) and one or more active double bridges (200), such that an output (S3, S4) of the active double bridges (200) is electrically isolated from the converter (100).

A drive for an air conditioning system includes a converter assembly including a Vienna rectifier having a converter capacitance across a positive DC bus and a negative DC bus; and an inverter assembly including an inverter capacitance across the positive DC bus and the negative DC bus, the inverter capacitance in electrical parallel with the converter capacitance; wherein the converter assembly and the inverter assembly are physically separate assemblies.

A system including a polyphase regulator. In some embodiments, the system includes: a first magnetic element, n switching poles, n being an integer greater than 2, a first port having a first node and a second node, and a second port having a first node and a second node. The first magnetic element may include n phase ports and an averaging port, and each of the n switching poles may include a phase node.

A switching power source device includes a plurality of power source circuits including a first power source circuit corresponding to a first phase of an external power source, and a second power source circuit corresponding to a second phase of the external power source that is different from the first phase; a first switching circuit capable of switching between a plurality of connection modes including a first mode of connecting the second power source circuit to the first phase in parallel with the first power source circuit, and a second mode of connecting the second power source circuit to the second phase; a memory; and a hardware processor coupled to the memory, the hardware processor being configured to open and close a switching element included in the first power source circuit and a switching element included in the second power source circuit, in different phases in the first mode.

A method for controlling a chain-link power converter including three phase legs, each of which phase legs includes a plurality of series-connected converter cells, each of the cells including a DC capacitor, the phase legs being connected in a delta configuration. The method includes detecting an unsymmetrical voltage condition at a terminal of the converter; determining a ratio between a zero sequence and a negative sequence component of a compound current to be injected into the converter, based on the detected unsymmetrical voltage condition; calculating the compound current comprising the zero sequence component and the negative sequence component in accordance with the determined ratio; and injecting the compound current into the converter to control the converter in view of the detected unsymmetrical voltage condition.