12results about How to "Stabilize bus voltage" patented technology

The invention discloses a hybrid energy storage system applied to independent photovoltaic power generation. The hybrid energy storage system comprises a photovoltaic array, a load, a lithium battery and a super capacitor. The photovoltaic array is connected with the DC bus through the boost converter. The lithium battery is connected with the direct current bus through a DC / DC bidirectional converter; the super capacitor is connected with the direct current bus through the other DC / DC bidirectional converter; due to the influence of the temperature on the lithium battery, the application of the hybrid energy storage system with the lithium battery is limited, the normal operation of the lithium battery can be influenced by over-high temperature, and the stability and the safety performance of the whole independent photovoltaic power generation system can also be influenced. Through a power distribution method, when an external environment of a photovoltaic system changes and a load fluctuates, threshold limitation is carried out on charging and discharging power of a lithium battery so as to ensure long-time safe operation of the lithium battery to compensate power imbalance caused by fluctuation, and thus stability of a bus voltage is maintained; energy distribution can be effectively adjusted according to system energy changes, and system stability and safety are maintained.

The invention relates to a steering engine controller voltage control method based on a nonlinear interference predictor, and belongs to the technical field of steering engine bus voltage control. The method comprises the following steps: acquiring a steering engine control target angle position, and acquiring a direct current bus voltage of a steering engine controller through a sensor; obtaining a stable direct current bus voltage of the steering engine controller through a current feedforward nonlinear interference observation model according to the bus voltage of the steering engine controller; obtaining the steering engine angle position deviation and the steering engine angle position deviation change rate through an angle deviation analysis model according to the steering engine controller stable direct current bus voltage; and according to the steering engine angle position deviation and the steering engine angle position deviation change rate, obtaining a steering engine control correct angle position through a steering engine FA-PID model. The control of the bus voltage of the steering engine controller is realized, and the accuracy of the steering engine control angle position is improved at the same time.

The invention discloses a coordinated optimization control method based on voltage stability and multi-stack performance consistency, and the method comprises the steps: building a fuel cell voltage recession function through employing a quantitative weighted estimation method according to the influence of traction conditions of different scenes on the voltage recession of a fuel cell, and representing the recession rate of each fuel cell; according to the decline of each fuel cell, adopting an attenuation compensation distribution strategy to distribute the reference fluctuation power of each fuel cell converter in real time, and obtaining the actual output power of each fuel cell converter; based on a dynamic impedance simulation technology, the output power of each converter of a multi-stack fuel cell is coupled with a bus voltage, and the relationship between a droop coefficient and system stability is analyzed to realize autonomous balance of the system; based on the dynamic error correction principle, a multi-dimensional control regulator is adopted to control the system voltage deviation, the system bus voltage stability is ensured, the electric pile performance of the multi-pile fuel cell is kept consistent, the stable and long-life operation of the multi-pile fuel cell system under the complex working condition is met, the robustness is enhanced, and the service time is prolonged.

The application relates to a crimping IGBT three-level power unit structure based on phase change cooling, wherein a phase change cooling power assembly and a supporting capacitor assembly are arranged in sequence from front to back, a three-level valve string is horizontally placed, power devices are arranged between adjacent phase change cooling radiators, the phase change cooling radiators are vertically placed, phase change working medium connecting pipes are arranged at the upper part and the lower part of the three-level valve string, a valve string direct current connection row is arranged at the rear end of the three-level valve string, the connection terminals of the valve string direct current connection row are located above the three-level valve string and are in a leading direction, an output row is arranged at the front end of the three-level valve string, and the connection terminals of the output row are located on the side of the three-level valve string. The application has the advantages that the valve string direct current connection row and the valve string capacitor connection row of the supporting capacitor assembly are overlapped on the top between the phase change cooling power assembly and the supporting capacitor assembly, the connection terminals of the valve string capacitor connection row are in a leading direction, the phase change cooling power assembly can be disassembled on the front side of a cabinet body, and maintenance is easy.

The control circuit and control method of a bidirectional four-tube Buck-Boost converter, the converter is composed of four switch tubes and a filter inductor, the two ends of the filter inductor are respectively connected to the midpoints of the bridge arms of the switch tubes Q1, Q2 and the midpoints of the bridge arms of Q3, Q4, Q1 and Q2 are complementary conductive, Q3 and Q4 are complementary conductive, and the converter can realize bidirectional flow of energy. In order to improve the working efficiency of the converter, the four switch tubes realize ZVS while minimizing the effective value of the current, and a quadrilateral current control method is adopted for the four-tube Buck-Boost converter. The present invention proposes a control circuit and a control method for realizing stable operation and smooth switching of the converter in constant voltage mode and constant current mode, realizing natural commutation and smooth transition of the inductor current, so that the inductor current can realize smooth commutation of the current within a single switching cycle, and at the same time, it can also ensure that after the commutation signal is triggered, the switch tube does not lose the realization conditions of the soft switch, thereby improving the operating efficiency and reliability of the converter.

The invention provides an energy storage control method, device and equipment applied to a direct-current micro-grid and a medium, and belongs to the technical field of micro-grids. The energy storage system of the direct-current micro-grid comprises a plurality of energy storage units, and the method comprises the following steps: for an energy storage unit comprising a lithium battery and a direct-current converter, acquiring the output current of the lithium battery, the output current and the output voltage of the direct-current converter and the operation flag bit and the average charge state of the energy storage system at the current moment; determining a current reference signal according to the operation flag bit of the energy storage system; according to the output current of the direct current converter, the operation flag bit and the average charge state of the energy storage system and the predetermined charge state of the lithium battery at the current moment, a preset bus voltage given value is corrected; and according to the output current of the lithium battery, the output voltage of the DC converter, the current reference signal and the corrected bus voltage given value, adjusting the operation state of the DC converter. According to the invention, SOC balance among a plurality of energy storage units can be realized.

The invention relates to a photovoltaic output control method for an energy storage system, and the method comprises the steps: setting a photovoltaic panel to be connected with a load to form a power loop and connected with a battery to form a charging and discharging loop, enabling the power loop and the charging and discharging loop to be connected to a bus in parallel, obtaining the operation data of a photovoltaic energy storage off-grid system, and carrying out the control of the photovoltaic output of the photovoltaic energy storage off-grid system based on the operation data and battery parameters. And determining an expected output power upper limit, an expected output power lower limit and actual operation power of MPPT control, increasing the bus voltage by adopting a positive step length under the condition that the actual operation power is smaller than the expected output power lower limit, and reducing the bus voltage by adopting a negative step length under the condition that the actual operation power is larger than the expected output power upper limit. According to the invention, the problem of low energy utilization rate of the optical storage system is solved, the upper and lower limits of the expected output power are determined through the operation data and the battery parameters, battery overcharge is avoided, and the energy utilization rate is improved under the condition of ensuring battery safety.

This invention relates to the field of control technology for hybrid compressed air and flywheel energy storage, and particularly to a method and system for coordinated power control of impulsive loads in an islanded microgrid. The method includes the following steps: real-time monitoring of the microgrid bus power and calculation of the bus power change rate; when the bus power change rate is greater than a first preset threshold, controlling the output power of the flywheel energy storage system to smooth power fluctuations caused by impulsive loads; when the bus power change rate is less than a second preset threshold, implementing a coordinated control strategy for the compressed air energy storage system and the flywheel energy storage system; when the bus power change rate is less than the first preset threshold but greater than the second preset threshold, controlling the compressed air energy storage system to handle normal load fluctuations, and controlling the flywheel energy storage system to operate continuously. This invention achieves smooth power switching through the balanced adjustment of the compressed air energy storage system and the flywheel energy storage system, effectively maintaining the stability of the microgrid bus voltage and frequency.

The invention relates to the technical field of unmanned aerial vehicle power distribution, and particularly discloses a hybrid power unmanned aerial vehicle power distribution device and method, and the device comprises an energy management module which comprises an energy management computer, a pair of battery management units, and a pair of generator controllers; the pair of bus bars are used for collecting energy output by the pair of high-voltage battery packs and the pair of generators, the two bus bars are connected through a first contactor, and each bus bar is provided with a plurality of load interfaces; the load management module comprises a plurality of load management units, the input end of each load management unit is connected with one load interface, and the output port of each load management unit is connected with one load; and the communication module is respectively connected with the flight management computer and the electric load through a communication bus. The generator is used as a main power supply, the bus voltage is maintained through voltage stabilization control of the generator controller, and the high-voltage battery pack is used as a current following assembly, so that the stability of the bus voltage is ensured, and the quick response characteristic of the high-voltage battery pack can be reasonably utilized.

The invention discloses a bus voltage balancing circuit of an optical storage direct-flexible system and a control method. The balancing circuit designed by the invention can effectively improve the voltage stability of the system and reduce the influence caused by voltage fluctuation. By adopting the virtual capacitor controller and the current inner loop / PWM generator, the working mode of the bidirectional DC converter can be accurately controlled, so that efficient bidirectional flow of energy between the super capacitor and the DC bus is realized. Besides, according to the control method, different operation conditions can be flexibly coped with through a preset working mode and an applicable scene, and it is ensured that the bus voltage can be kept stable in various scenes.

This invention relates to a rule-based coordinated control method for wave energy independent power generation, storage, and utilization in a wave energy independent power generation system. It is applicable to the fields of wave energy power generation and electrochemical energy storage. The technical solution adopted in this invention is: a rule-based coordinated control method for wave energy independent power generation, storage, and utilization in a wave energy independent power generation system, characterized in that: the wave energy independent power generation system includes a power generation unit, an energy storage unit, an energy consumption unit, and a system coordination controller; the power generation unit includes a power generation branch, a power consumption branch, and a power generation unit controller; the energy storage unit includes an energy storage branch and an energy storage unit controller; the energy consumption unit includes a non-self-consumption AC / DC load branch and a load controller; the power generation branch of the power generation unit is connected to the power consumption branch, the energy storage branch, and the non-self-consumption AC / DC load branch via a DC bus.

An electric transmission air pump control method comprises the steps that according to a designed rotating speed-power curve of a generator and a pump motor, the matching balance relation between generated power and wind resistance loads brought by the rotating speed of the pump motor is reasonably distributed; in order to achieve the purpose that pump motors are always kept in operation during steady-state operation of a heat dissipation system and equipment overtemperature does not occur, speed regulation control over the heat dissipation air pumps is dynamically carried out in real time, and power generation operation of a power generator and speed regulation operation of a plurality of heat dissipation air pump motors can be controlled at the same time. Stable control over the electric transmission air pump is achieved without adding high-power energy storage equipment such as a super capacitor or a high-voltage power battery, the system cost is reduced, and the reliability is improved.