8 results about "Bus voltage" patented technology

The invention relates to a DC bus voltage compensation method based on fuzzy control, mainly applied to a DC micro grid system adopting droop control. The DC bus voltage compensation method provided by the invention takes a cell average output current and average output voltage change ratio as an input quantity of a fuzzy controller by setting up the fuzzy controller, obtains a variable bus voltage set value by virtue of fuzzy reasoning and can well solve the problem that the traditional voltage compensation method still has high bus voltage drop under a heavy load condition.

The embodiment of the invention discloses an input anomaly detection method and system in a three-phase rectifier circuit and related equipment. The input anomaly detection in the three-phase rectifier circuit is realized based on a software algorithm, so that the hardware cost is saved. The method in the embodiment of the invention comprises the steps that direct current bus voltages after rectification of a three-phase alternating current power supply is periodically acquired within a current timing period; the frequency 1/p of the three-phase alternating current power source is determined;Fourier coefficients a1 and b1 corresponding to a fundamental frequency component with the frequency of 2/p in a Fourier expansion form of the direct current bus voltages are calculated; a fundamentalfrequency amplitude c1 = (a12 + b12) 1/2 corresponding to the fundamental frequency component is calculated; and if the fundamental frequency amplitude c1 is larger than a first preset value, it is determined that the input of the three-phase alternating current power supply in the current timing period is abnormal.

According to the BUCK amplitude-modulated high-frequency high-voltage electrostatic power supply and the working method thereof, after power frequency rectification filtering, BUCK chopping and high-frequency filtering are adopted, direct-current bus voltage with the amplitude modulated by the BUCK chopping is output, a series resonance inverter circuit composed of an IGBT full bridge, a capacitor and an inductor is connected, the resonance inverter circuit is controlled through pulses to work, and pulse current is output; and meanwhile, the two groups of series resonant inverter circuits work cooperatively, so that the pulse frequency of the pulse current is improved, and the amplitude-adjustable high-frequency high-voltage power supply is obtained. Through combination of the BUCK amplitude modulation technology and the high-frequency power supply technology, the power factor of a traditional silicon controlled rectifier amplitude modulation power supply is improved, the amplitude modulation range is widened, the application scene of the high-frequency power supply is further widened, and the reliability and adaptability of the high-frequency power supply to special working conditions are improved.

The embodiment of the invention discloses a voltage adjustment method, which is used for adjusting the voltage of a high-voltage side bus. The method provided by the embodiment of the invention comprises the steps of obtaining current station service power consumption and current high-voltage side bus voltage; calculating station service power consumption under different high-voltage side bus voltages; comparing the station service power consumption under different high-voltage side bus voltages to obtain a target high-voltage side bus voltage when the station service power consumption value is minimum; and adjusting the high-voltage side bus voltage value to the target high-voltage side bus voltage. According to the scheme, the station service power consumption under the current high-voltage side bus voltage and the station service power consumption of the high-voltage side bus voltages with different voltage values are acquired and compared to obtain the corresponding high-voltage side bus voltage value when the station service power consumption under the current operation environment is lowest; and the voltage value of the high-voltage side bus is correspondingly adjusted to a target value, so that the power consumption in the plant is reduced, the power plant can stably operate under the most economical condition, and the operation economy of the power plant is improved.

The invention discloses a silicon carbide transistor unmanned aerial vehicle electronic speed controller. An SBUS bus input module, an MCU master control circuit module, a three-phase gate driver module and a silicon carbide power circuit module of the silicon carbide transistor unmanned aerial vehicle electronic speed controller are connected in sequence, and the input ends of the SBUS bus input module, the MCU master control circuit module, the three-phase gate driver module and the silicon carbide power circuit module are connected with a power circuit module at the same time. The output end of the bus voltage measurement circuit module, the output end of the temperature measurement circuit module and the output end of the phase voltage acquisition circuit module are respectively connected with the MCU main control circuit module, and the brushless motor is connected with the input end of the phase voltage acquisition circuit module and the output end of the silicon carbide power circuit module. The input end of the bus voltage measuring circuit module is connected with the battery module. According to the silicon carbide transistor unmanned aerial vehicle electronic speed controller provided by the invention, the unmanned aerial vehicle can stably and reliably fly for a long time, and the risk that the electronic speed controller is damaged due to overheating is reduced.

The invention discloses a power conversion circuit, comprising a rectifier module (1), an inductor (2), a capacitor (3), and an inverter circuit (4), wherein the inverter circuit (4) is connected withthe motor (6); the motor control module (12), the current control module (13) and the PWM modulation module (14)are connected in sequence; the voltage detection module (5) is disposed on the capacitor (3), and is connected to the motor control module (12); the first current sensor (81) is connected in series with the alternating current power source (9), and connected to the motor control module(12); and the motor control module (12) determines the improved q-axis torque current reference value Iq_Ref_g according to the alternating current iac and the bus voltage udc. The invention has thebeneficial effects that the change rules of the input current and the input voltage are the same by determining the q-axis torque current reference value Iq_Ref, that is, the power factor of the powerconversion circuit is improved.