5results about How to "Reduce voltage deviation" patented technology

The application provides a static SVG device suitable for heavy load of a locomotive, relates to the field of railway power supply, and comprises a three-phase MMC converter, the three-phase MMC converter comprises three-phase bridge arms, each phase bridge arm is composed of an upper bridge arm and a lower bridge arm, the upper bridge arm comprises a plurality of cascaded half-bridge sub-modules, and the lower bridge arm comprises a plurality of cascaded half-bridge sub-modules, wherein the energy storage elements of the half-bridge sub-modules at least comprise super capacitors; further comprising: a voltage balancing module, which is used for determining the number of real-time input half-bridge sub-modules of the upper bridge arm and the lower bridge arm of each phase bridge arm, and determining the real-time input half-bridge sub-modules of the upper bridge arm and the lower bridge arm of each phase bridge arm based on the number of real-time input half-bridge sub-modules of the upper bridge arm and the lower bridge arm of each phase bridge arm; a network-forming voltage source control module, which is used for active control, reactive control and virtual impedance control, has the advantages of adapting to heavy load of a locomotive and improving the stability of power system operation.

An isolated bipolar output self-voltage balancing DC-DC converter, the converter comprising a forward converter, a bipolar voltage balancing unit; the forward converter comprises a DC input source u in , a power switch S1, a reset inductor L p1 , a transformer T, a reset diode D p1 , a rectifier diode D1, a freewheeling diode D2, an inductor L 1, an output capacitor C 1; the bipolar voltage balancing unit comprises a rectifier diode D3, a freewheeling diode D4, an inductor L 2, an inductor L 3, an output capacitor C 2, a voltage balancing capacitor C p The application can effectively reduce the voltage imbalance problem caused by cross regulation ratio of the traditional forward converter in bipolar output, reduce voltage deviation, and the circuit control is simple, the automatic voltage balancing of the bipolar output is realized through the bipolar voltage balancing unit, without complex sampling and control algorithm, the control system design and implementation difficulty is low, and the application is suitable for the occasions requiring bipolar voltage power supply.

The application discloses a voltage regulation method and device for a distributed photovoltaic power distribution network. The method comprises the following steps: calculating the modulation voltage of a series converter based on a set reference voltage, an end node voltage, an input end voltage and an output end voltage of an end voltage regulator; calculating the regulation amount of an on-load voltage regulating transformer based on the reference voltage, the output end voltage of the on-load voltage regulating transformer and the input end voltage of the end voltage regulator; calculating the number of switched groups of a parallel capacitor bank in response to the absolute value of the difference between the output end voltage of the on-load voltage regulating transformer and the input end voltage of the end voltage regulator being greater than a set voltage regulating threshold; and calculating the active power reduction value of the distributed photovoltaic in response to the on-load voltage regulating transformer and the parallel capacitor bank exceeding the regulation range and still having an out-of-limit node voltage. The application can simultaneously consider the head node voltage and the end node voltage of the power distribution network and prevent voltage out-of-limit.

The invention relates to the technical field of power system automation, and discloses a multi-energy power distribution network intelligent switching method, system, equipment and medium based on adaptive control, and the method comprises the steps: collecting the multi-source heterogeneous data of power grid operation data, meteorological information, load characteristics and the like in real time through constructing a multi-dimensional state sensing network; an intelligent decision-making model is established based on the deep Q network, and autonomous learning and dynamic optimization of a switching strategy are realized; a multi-time-scale coordination control framework is designed, fault detection is completed at the microsecond level, switching decision is completed at the millisecond level, and system stable adjustment is completed at the second level; a hybrid energy storage buffer technology is developed, and switching transient impact is effectively inhibited; and a multi-objective optimization function considering equipment life and economic cost is established, and comprehensive balance of power supply reliability, economy and equipment health management is realized.

According to one aspect of the disclosure, a display device includes a substrate in which a plurality of sub-pixels having different areas are defined, a light emitting element disposed on each of the plurality of sub-pixels and including an anode and a cathode, a first anode reset line connected to some of the plurality of sub-pixels and outputting a first anode reset voltage to the anode, and a second anode reset line connected to the remaining sub-pixels of the plurality of sub-pixels and outputting a second anode reset voltage to the anode. Accordingly, according to the disclosure, different anode reset voltages are applied according to the areas of the plurality of sub-pixels, so that a voltage deviation of the anode and a color variation according to the areas of the plurality of sub-pixels can be reduced.