44results about How to "Eliminate Harmonic Interference" patented technology

The invention relates to an energy storage converter and a battery energy storage system of the energy storage converter. The energy storage converter comprises an AC / DC module, an LCL filter, a main contactor, an alternating current EMI filter, an alternating current side pre-charging circuit, a main circuit breaker, a CL filter, a direct current EMI filter, a direct current side pre-charging circuit and a direct current side circuit breaker, wherein the alternating current side of the AC / DC module is sequentially connected with the LCL filter, the main contactor, the alternating current EMI filter and the main circuit breaker, the alternating current side pre-charging circuit is connected to the two ends of the main contactor in parallel, the direct current side of the AC / DC module is sequentially connected with the CL filter, the direct current EMI filter and the direct current side circuit breaker, and the direct current side pre-charging circuit is connected to the two ends of the direct current side circuit breaker in parallel. According to the energy storage converter and the battery energy storage system, the problem of power fluctuation in a micro-grid is solved, and the running reliability of the micro-grid is improved.

The invention claims a method for eliminating harmonic interference of earthquake data, comprising the following steps: according to the original waveform data in the earthquake data, determining the initial frequency of harmonic interference through the oscillation period of the original data and the maximum position of the amplitude spectrum; calculating the amplitude of the harmonic interference cosine function; and according to the earthquake data vector, the amplitude of harmonic interference cosine function, the harmonic interference cosine function vector and the target function derivative, the harmonic interference frequency amendment quantity and the time delay amendment quantity, adopting a frequency modifier formula to determine the harmonic interference frequency; and calculating the effective signal of earthquake. The method overcomes the disadvantage that the frequency domain suppresses the harmonic interference, and is quicker in speed than the time domain harmonic interference suppressing method, thereby improving the signal-to-noise ratio, and being capable of eliminating the harmonic interference in the earthquake data generated by high voltage transmission line and also eliminating the harmonic interference in the earthquake data generated by periodic vibration.

The invention discloses a circuit capable of realizing harmonic power conversion. The circuit comprises a resonance type harmonic current converter, wherein the input end of the resonance type harmonic current converter is connected with a power grid; in addition, the output end of the resonance type harmonic current converter is electrically connected with a user load. An LC high-power tuning method is used; the harmonic wave ingredients and the energy of the harmonic wave ingredients are independently extracted from the power grid; the effective power is output; the efficiency is highest; the loss is lowest; the principle is simplest; convenience and high speed are realized. The harmonic interference is eliminated; meanwhile, the harmonic power is changed from waste materials into valuable materials; the method belongs to novel application with the practical value in the field of current electric power energy saving fields.

The invention provides a method and a system for eliminating a harmonic interference digital domain in a 5G terminal based on NSA architecture, and aims to solve the problem of self-interference caused by the same frequency of an LTE uplink harmonic signal and an NR downlink received signal in the 5G terminal under the NSA architecture when LTE and NR are in dual connection. The method for eliminating the harmonic interference digital domain in the 5G terminal based on the NSA architecture comprises two stages of digital domain interference elimination, wherein the first stage uses an extra feedback channel of the transmitting end to feed back a radio frequency signal of a transmitting link to the receiving end for self-interference elimination, and the second stage models a harmonic signal according to the broadband multi-carrier frequency domain harmonic model provided by the invention and performs interference elimination in the frequency domain. Harmonic self-interference generatedby high-power and large-bandwidth signals can be well eliminated so that the 5G terminal is enabled to work more stably when using the interference spectrum, and the spectrum utilization rate can beenhanced.

The invention discloses an electricity saving device, comprising a system control module, a main loop control module and a chopper, wherein the main loop control module is respectively connected with the system control module and the chopper. The system control module is used for receiving the working condition data of a power grid, sent by the main loop control module, and setting the voltage reduction parameters of the main loop control module; the main loop control module is used for generating four groups of pulse width modulation signals according to the voltage reduction parameters and outputting the four groups of pulse width modulation signals to the chopper; and the chopper is used for receiving the voltage of the power grid, completing voltage reduction according to the four groups of pulse width modulation signals and outputting the voltage to loads. Based on the technical scheme, the automatic voltage stabilization type electricity saving device is provided, and by means of the technical scheme, harmonic interference is eliminated and voltage-stabilizing output is realized. In addition, according to the technical scheme, when the voltage of the power grid is lower thana preset low-voltage threshold, the power grid automatically quits an electricity-saving working state and the voltage of the power grid is directly transmitted to the loads.

In this invention, the electric control energy-saving device for oil-pumping motor comprises: (1). the variable voltage-dropping inductors, composed of main-loop induction coils (L1, L3, L5) and auxiliary induction coils (L2, L4, L6), said main-loop induction coils being connected to the power lines of the three phases of the oil-pumping motor; (2) the bidirectional silicon control, which being series connected to said auxiliary induction coils; (3). power induction devices, being equipped to the power lines of three phase of the motor; and (4). a controller, which signal input end being conencted to the output end of the power induction device, while which signal output end being connected to the control pole of the bidirectional silicon control. This invention product has advantages of: saving energy and lowering consumption of unavilable power, and eliminating the impact of resonance wave against electric network.

The invention relates to a multifunctional harmonic wave optimizing intelligent controller and a control method thereof. According to the controller, an electricity collecting unit receives voltage and current sampling signals of a pumping unit power supply and distribution system, the current sampling signals are output to an electricity measuring unit, and then the electricity measuring unit inputs measuring data into a diagnosis unit; the diagnosis unit and a harmonic wave optimizing unit are in communication connection through a communication unit; and the diagnosis unit inputs switching value signals through an input unit, and control signals are output to an external protection executing element through an output unit. According to the method, after a system is electrified, multitask threads are started; and each thread is subjected to function processing, and the threads comprise an electricity collecting task thread, a displaying task thread, a harmonic wave diagnosis thread, a switching value input and output management thread, a communication management thread, a protection processing thread and a shunt measuring protection control management thread. The controller and the control method are widely used in related industries, the reliability of power supply and distribution protection is effectively improved, harmonic interference is removed, power factors are improved, measuring is accurate, and equipment damage is lowered.