9results about How to "Reduce current ripple" patented technology

The application discloses a kind of vehicle-mounted unmanned aerial vehicle charge-discharge management system and method, including the full-amount state parameter of acquisition unmanned aerial vehicle, hangar, power supply and environment, constructs system state vector, dynamically calculates charging trigger threshold and judges charging trigger condition, exports charging trigger signal or standby instruction or low-power value guard instruction;Construct reinforcement learning scheduling system and complete charging channel, power level, power supply type Dynamic decision, output optimal charging scheduling instruction;Precise regulation and control to charging voltage, charging current is realized through double closed loop artificial neural network, compensates wireless charging coupling coil offset, exports battery real-time operation data in charging process;Battery health status is analyzed, battery remaining useful life is predicted in combination with battery state parameter collected in whole process, dynamically adjusts charging trigger threshold and optimal charging scheduling instruction.

A kind of high gain magnetic integrated DC-DC converter for photovoltaic power generation system, it is characterized in that, including CDDC unit, the CDDC unit is connected with power supply V IN Connection, the CDDC unit is connected with magnetic integrated inductance unit, the magnetic integrated inductance unit is connected with fast recovery diode D3, the fast recovery diode D3 is connected with power switch tube Q1, the magnetic integrated inductance unit is connected with fast recovery diode D4, the fast recovery diode D4 is connected with output filter capacitor C3, EE magnetic core upper portion is arranged in the magnetic integrated inductance unit, EE magnetic core lower portion is arranged in the magnetic integrated inductance unit, topology structure is simple, device is less, control is convenient, especially modular design is carried out, the CDDC unit is introduced, so that system obtains higher gain, while the magnetic integrated inductance unit introduced improves the power density of converter, the application helps to promote the performance improvement of high gain magnetic integrated DC-DC converter for photovoltaic power generation system.

The embodiment of the utility model provides an inverter adopting an electromagnetic compatibility design, and the inverter comprises an input side electromagnetic interference filtering module of which the input end is connected with a DC input interface; the input end of the power supply switching unit is connected with the output end of the input side electromagnetic interference filtering module; the input end of the common mode inductor is connected with the output end of the power supply switching unit; the input end of the inversion unit is connected with the output end of the common mode inductor unit; and the input end of the alternating-current inductor-capacitor-inductor filtering module is connected with the output end of the inversion unit, and the output end of the alternating-current inductor-capacitor-inductor filtering module is connected with an alternating-current load interface.

The present application relates to the technical field of light storage hybrid power generation control, and particularly to a multi-port light storage hybrid power generation modulation method and system based on current ripple suppression. The method comprises obtaining grid-side voltage and current data; determining a space vector sector according to a reference voltage vector of the grid-side voltage and current data; constructing a clamping sequence based on a reference sector of the space vector sector; establishing a current ripple model according to the clamping sequence and selecting a minimum ripple clamping sequence; deriving a double modulation wave of the minimum ripple clamping sequence based on a volt-second balance; and performing carrier comparison and driving output based on the double modulation wave. The present application systematically gives all clamping switch sequences and determines the influence type of the clamping switch sequences on system power, so that dynamic power regulation among photovoltaic units, energy storage units and loads of a multi-port light storage hybrid power generation system can be realized on the basis of reducing switch loss and improving system efficiency.

The invention discloses a charging and discharging system and a vehicle, relates to the technical field of vehicle control, and aims to solve the problem of low charging and discharging efficiency of a battery. The charging and discharging system comprises a motor, an inverter and a controller, the motor comprises a multi-phase winding, the inverter comprises a multi-phase bridge arm, each phase bridge arm is electrically connected with one phase winding, and the controller is configured to control the bridge arm connected with a target phase winding in the multi-phase winding to be conducted so as to charge or discharge a battery electrically connected with the charging and discharging system; wherein the number of the target phase windings is determined according to the maximum charging current value allowed by the current charging state of the charging and discharging system or the maximum discharging current value allowed by the current discharging state of the charging and discharging system.

The invention relates to the technical field of grid-connected power generation, and discloses a multi-input DC-AC circuit and a control method.The multi-input DC-AC circuit comprises a plurality of sets of interleaved Boost circuits, each interleaved Boost circuit comprises a bus capacitor and a plurality of Boost circuits, the Boost circuits are interleaved in parallel, the input ends of the Boost circuits are connected with corresponding power generation assemblies, and the output ends of the Boost circuits are connected with the bus capacitor. The output ends of the Boost circuits are connected with bus capacitors in the same group of interleaved parallel Boost circuits; and the input end of any DC-AC circuit is connected with the output end of the corresponding interleaved Boost circuit, and the output end of the DC-AC circuit is connected with an AC power grid. According to the multi-input DC-AC circuit, the problem that the maximum efficiency point of the pre-stage interleaved Boost circuit is not matched with the maximum efficiency point of the post-stage DC-AC circuit is solved, and the overall efficiency of the multi-input DC-AC circuit is improved.

The invention provides a flywheel energy storage sliding mode power controller based on an improved index approaching rate, and belongs to the technical field of flywheel energy storage. A system state variable is introduced into a traditional exponential reaching rate for improvement, so that the reaching speed is associated with a system state, the reaching speed is increased when the system state is far away from a sliding mode surface, and the speed is slowed down when the system state approaches the sliding mode surface to smoothly enter the sliding mode surface; meanwhile, a sign function is replaced by a smooth and continuous hyperbolic tangent function, so that buffeting caused by discontinuity of a switching function is weakened; designing a flywheel energy storage sliding mode power controller based on the improved exponential reaching law, performing stability analysis on the flywheel energy storage sliding mode power controller by adopting a Lyapunov function, and performing simulation verification; simulation results show that the flywheel energy storage sliding mode power controller based on the improved exponential approach rate can realize power overshoot-free tracking, has higher power response speed, and weakens current buffeting while improving the dynamic response performance of the system.

The subject matter of this specification can be embodied in, among other things, a method that includes receiving a first current output setpoint, identifying a first operating condition based on the first current output setpoint, providing a first pulse width modulation (PWM) signal having a first predetermined duty cycle based on the identified first operating condition, the first PWM signal being based on the first current output setpoint and provided for a predetermined time period, receiving a second current output setpoint, identifying a second operating condition different from the first operating condition based on the second current output setpoint, and providing a second PWM signal having a second predetermined duty cycle based on the identified second operating condition, the second PWM signal being based on the second current output setpoint and provided for a predetermined multiple of the predetermined time period.

The application discloses a kind of permanent magnet synchronous motor double vector model predicted current control methods considering dead zone, it is related to motor drive control technical field, comprising the following steps: S1, establish PMSM discrete prediction model and sampling: derivation current prediction equation;S2, based on the classification strategy of cost function and torque current: voltage vector is divided into overshoot vector group and under shock vector group;S3, double vector screening strategy based on classification strategy: screening out optimal double vector candidate combination;S4, dead zone determination and beatless time synthesis: output final switch control pulse.The application adopts the above-mentioned permanent magnet synchronous motor double vector model predicted current control method considering dead zone, reduces the current distortion caused by dead zone effect, solves the local optimal problem in traditional strategy, and greatly reduces the calculation burden, provides a kind of efficient control scheme with high dynamic response, global steady-state accuracy and low harmonic characteristic for ship PMSM propulsion system.