9results about How to "Improve voltage utilization" patented technology

The invention belongs to the technical field of power electronics, and relates to a hybrid device common bridge arm three-level split output inverter modulation method and system, and the method comprises the steps: obtaining a mapping phase angle, a modulation degree and a region number according to a reference voltage vector generated by a three-phase original modulation wave; mapping the phase angle, the modulation degree and the switching period according to the size of the modulation degree to obtain two kinds of vector action time; generating two modulation waves according to the area number and the action time of the two vectors; generating a first pulse driving signal according to the area number, the first modulation wave and the forward and reverse carrier waves; generating a final carrier according to the area number and the forward and reverse carriers, and generating a second pulse driving signal according to the second modulated wave, the forward carrier, the forward carrier of the previous period and the final carrier; and selecting a driving signal from the two pulse driving signals according to the area number. The modulation degree can be maximized, driving pulses are respectively generated in different modulation degree ranges, the output current quality is high, and the total harmonic distortion rate is low.

The embodiment of the invention provides a double-voltage three-level inverter circuit and a control method and a control system of the double-voltage three-level inverter circuit. The circuit comprises a direct-current power supply, a voltage-multiplying module and a three-level inverter which are connected in sequence, the voltage-multiplying module comprises two driving loops, and each driving loop comprises a power switch, a diode, a direct current link capacitor and a resonant inductor which are connected in sequence. According to the embodiment of the invention, the voltage-multiplying module is added to be combined with a traditional diode clamping type three-level inverter, and the power switches are alternately conducted in the voltage-multiplying module to carry out complementary half-wave resonant charging control on the two direct-current link capacitors, so that time-sharing multiplexing of the direct-current power supply is realized; the two capacitor voltages are charged to be the same as the direct-current power supply voltage, so that the inverter obtains double voltage gain on the direct-current side, and the voltage utilization rate is improved; meanwhile, the neutral point of the inverter is connected between the two direct-current link capacitors with the same voltage, the voltage of the neutral point of the inverter is automatically balanced, and the control difficulty of the inverter is reduced.

This utility model discloses a control device for a dual-winding stepper motor, relating to the field of stepper motor drive technology. It includes: a first winding control device and a second winding control device for controlling the two winding coils of a dual-winding stepper motor. Both the first and second winding control devices include a data acquisition and output unit and connected to it a main control unit, an operation display unit, a drive unit, and a power supply unit. They also include a maintenance unit connected to the main control unit and the drive unit. The output terminal of the drive unit is connected to the winding coils, and the main control unit, data acquisition and output unit, and drive unit are all connected to the power supply unit. The two drive units are interconnected. This utility model utilizes digital technology and modular design, making the system's control and monitoring more precise and flexible. Furthermore, each module can be independently designed, tested, and maintained.

The invention belongs to the technical field of nuclear power, and particularly relates to a high-voltage frequency converter harmonic control method and a filter. According to the method, the harmonic component in the output voltage of the frequency converter can be effectively reduced. According to the method disclosed by the invention, a relatively high fundamental frequency is obtained through modulation, and the voltage utilization rate is improved, so that the torque ripple of the motor is remarkably reduced. Under the same switching frequency, the method disclosed by the invention can generate the optimal output waveform. While the waveform quality is ensured, the switching frequency and the switching loss are reduced, and the overall efficiency of the system is improved.

The application discloses a three-phase E-type hybrid level double-output integrated converter and a carrier PWM modulation method thereof, and belongs to the technical field of power electronic conversion devices. The three-phase E-type hybrid level double-output integrated converter comprises one DC input power supply, two capacitors on the DC input side, 15 switch modules, and one set of three-phase inductive load on each output end of the bridge arm of each phase. The carrier PWM modulation method with added DC offset and zero sequence component is given for the proposed converter. Two sets of modulation waves with added DC offset and zero sequence component are compared with anti-phase stacked carriers respectively. According to the switch state and the comparison result, the logic operation for generating the driving signals of each switch module is derived. One set of DC input voltage is converted into three-level AC voltage on the upper end and two-level AC voltage on the lower end through the inverter circuit, and the frequency and amplitude of the three-phase AC voltage can be adjusted. The three-phase E-type hybrid level double-output integrated converter can be widely applied to the double-motor driving application scene of one master and one slave, and has the advantages of reasonable structure, scientific modulation method, outstanding performance and the like.

The invention relates to the technical field of motor control, and provides a motor control method and device and electronic equipment, and the motor control method comprises the steps: judging whether a vector control motor is in a driving state or a power generation state, and obtaining a first judgment result; judging whether the vector control motor is in a deep flux weakening state to obtain a second judgment result; according to the first judgment result and the second judgment result, a voltage limiting strategy is selected, and the voltage limiting strategy comprises a voltage limiting strategy preferentially meeting the q-axis voltage or a voltage limiting strategy preferentially meeting the d-axis voltage; generating a limited d-axis voltage instruction and a limited q-axis voltage instruction according to the selected voltage limiting strategy; and controlling the vector control motor based on the limited d-axis voltage command and the limited q-axis voltage command. According to the method, the voltage utilization rate of the bus can be improved while the current control stability is ensured, so that the system efficiency is improved.

The invention discloses a direct current chain voltage control method for a permanent magnet synchronous motor system without an electrolytic capacitor, and the method comprises the steps: constructing a minimum bus voltage based on an expected voltage vector angle in real time according to the maximum output capability of a space vector modulation link and an output expected voltage vector; when the output voltage of the rectifier is lower than the minimum bus voltage, the power switch device in the direct-current chain is switched on immediately, so that the thin-film capacitor is switched into the direct-current chain, the insufficient output voltage of the rectifier is compensated by utilizing the voltage of the thin-film capacitor, and the direct-current chain voltage is always higher than the minimum bus voltage. The contradiction between reduction of the capacitance value of the direct-current chain thin-film capacitor and high-performance control of the driving system is effectively solved; under the condition that the space vector modulation technology is applied, the direct current link voltage stability of the permanent magnet synchronous motor system without the electrolytic capacitor in high-performance operation can be ensured, and therefore efficient and reliable control over the driving system is achieved.

The invention belongs to but is not limited to the technical field of alternating current motors and driving control, and discloses a series winding motor winding phase sequence switching topological system, a modulation method and an inverter, the series winding motor winding phase sequence switching topological system comprises a first bridge arm L1, a second bridge arm L2, a third bridge arm L3, a fourth bridge arm L4 and bipolar diodes TR1, TR2, TR3 and TR4, the four bipolar diodes are turned on or turned off, and the series winding motor winding phase sequence switching topological system is formed. And the phase sequence of the series winding motor can be changed. And then, a corresponding modulation strategy is switched to realize that the three-phase series winding motor uses a torque output topological structure at low speed and heavy load and uses a rotating speed output topological structure at high speed and light load. By means of switching of the topological structure of the series winding motor, the working interval and efficiency of the series winding motor can be optimized so as to adapt to different operation conditions, and the torque-rotating speed operation domain of the three-phase series winding motor is effectively expanded.

The invention discloses a photovoltaic power generation system optimization method based on dynamic reactive power margin management, and relates to the technical field of new energy power generation, and the method comprises the steps: obtaining first parameters of a photovoltaic power generation system, the first parameters comprising photovoltaic array output power, inverter operation parameters and power grid operation parameters; calculating the current reactive power margin of the system based on the first parameter to obtain a reactive power margin parameter; according to the reactive power margin parameter, setting a dynamic threshold identification system reactive power optimization space to obtain a second parameter which represents the adjustable reactive power capacity of the system; and inputting the reactive power margin parameter and the adjusted reactive power into a particle swarm optimization algorithm, and searching an optimal reactive power distribution scheme which enables the system voltage stability margin to be maximum through the particle swarm optimization algorithm. And the robustness and reliability of the system are improved.