41results about How to "Solve voltage fluctuations" patented technology

The invention relates to a direct-driving wave power-generating and energy-storing device and a control method. The direct-driving wave power-generating and energy-storing device is characterized by comprising a direct-driving wave generator, an AC/DC (Alternating Current or Direct Current) converter, a DC/AC (Direct Current or Alternating Current) converter, a plurality of loads, two DC/DC (Direct Current or Direct Current) converters, a mixed energy storing system and a controller, wherein the mixed energy storing system comprises an ultra-capacitor bank and a storage battery pack; the direct-driving wave generator is used for converting the kinetic energy of waves to a low frequency alternating current and sending to the AC/DC converter; the AC/DC converter is used for converting the low frequency alternating current to a direct current and connect and connected with the input end of the DC/AC converter through a direct current bus; the output end of the DC/AC converter is connected with the loads; the direct current bus is respectively connected with one ends of the two DC/DC converters, the other end of one of the two DC/DC converters is connected with the capacitor bank, and the other end of the other of the two DC/DC converters is connected with the storage battery pack; and the controller is used for controlling the ultra-capacitor bank and the storage battery pack to regulate power flow so as to keep the balance between the output power of the direct-driving wave generator and the power of the loads. The invention can be widely applied to the process of converting the kinetic energy of sea water fluctuation to the electric energy.

The invention discloses a method and a system for the dynamic optimization control of an electric power system, which relates to the technical field of the planning and the control of the electric power system. The method comprises the following steps of: (1) sectionalizing a load curve, minimizing the sum of the load variances in all the periods of time, maximizing the differences between the load averages of all the adjacent periods of time; and (2) supplying power to a load according to the sectionalization result in step 1. The invention ensures that the sum of the load variances in all the periods of time is minimized and the differences between the load averages of all the adjacent periods of time are maximized when the load curve is sectionalized so as to solve the problem of larger voltage fluctuation and electric energy loss caused by unreasonable optimization in the prior art.

The invention discloses a direct hanging type large-capacity electric energy quality comprehensive managing device for an electrified railway. The direct hanging type large-capacity electric energy quality comprehensive managing device comprises an active compensation system and a passive compensation system. The passive compensation system comprises two passive high-pass filters for filtering higher harmonics out and providing partial capacitive reactive power, and the active compensation system is formed by connecting a plurality of active compensation units in parallel. The direct hanging type large-capacity electric energy quality comprehensive managing device has the advantages of being simple in structure, low in cost, good in reliability, capable of solving various electric energy quality problems and the like.

The invention discloses a novel system and method for managing electrification railway electric energy quality, wherein the system comprises a traction transformer with a filter winding, a sensing filter circuit, an MMC compensation system, an MMC controller, a voltage and electric current measuring apparatus; the traction transformer high voltage side is connected to electric network; a traction side is connected to a traction arm of an electric locomotive for providing electric power for the electric locomotive; and a low voltage compensation side is connected to the sensing filter circuit and the MMC compensation system. The MMC compensation system is constituted by two connected to single-phase MMC traction arm groups; direct current sides of the two MMC traction arm groups are connected together through a serial capacitor; and a grounding point of the MMC compensation system is led out in the geometric midpoint of the serial capacitor. With the method, harmonic waves are dynamically tracked and suppressed through the MMC technology and the sensing filter technology; active power balance and reactive power adjustment are performed to the load at two traction sides, thereby achieving the purposes of managing the harmonic waves, reactive power and negative sequence of the traction transformer high-voltage side of the electrification railway.

A method and a device for control a self-energy storage multi-end flexible system are disclosed, Based on the mathematical model of self-energy storage multi-terminal flexible system, a coordinated control strategy based on voltage margin control is proposed. The control strategy is designed for the typical operating mode of the system, and the working principle of the system is analyzed in detail, so that the system can run stably under different operating conditions. A command filter backstepping voltage controller is designed to solve the problem of power oscillation and voltage fluctuationcaused by system mode switching and to improve the robustness and dynamic response performance of the system. Simulation results verify the feasibility and effectiveness of the proposed method, whichprovides theoretical basis and technical support for coordinated control of self-energy storage multi-terminal flexible system.

The invention relates to a high voltage ride-through control method for a double-fed fan after considering a power constraint of a converter. When a doubly-fed wind turbine encounters a high voltage of a system, the main control gives control of the wind turbine power to a converter, the controller performs control, and a DC unloading Chopper circuit connected on a DC bus in parallel is input to develop the high-through control; after the high voltage is over, the main control restores control of the wind turbine power. The high voltage ride-through control method solves the problems of DC busvoltage fluctuation and grid side current distortion due to the overvoltage in the transient process, and ensures the safe operation of the wind power system during the fault ride-through.

The invention relates to an acquisition terminal mainly applied to monitoring a power transformer in real time, in particular to a wireless acquisition terminal based on solar energy and RF (Radio Frequency) technology. The wireless acquisition terminal comprises a power supply, a plurality of branch controllers with sensors used for measuring data of the power transformer, and a main controller used for processing the data. The branch controllers are provided with an RF transmission terminal respectively; the main controller is provided with an RF receiving terminal and a GSM communication module capable of sending signals to a dispatching center or a mobile phone; and the power supply is a storage battery which is connected with a solar charger and a solar polar plate. The acquisition terminal has the advantages of stable systematic operation, less investment, convenient equipment installation, low cost, and energy conservation and environmental protection.

The invention relates to a wide-stop-band noise suppression structure applied to a power distribution network in system-in-package and an intelligent optimization design method thereof. Compared withthe prior art, the defects that the noise suppression structure is low in efficiency, long in design period and difficult to optimize the design are overcome. According to the invention, a rectangulararea is divided on a device bearing copper plate; wherein the four sides of the rectangular area are composed of 72 rectangular blocks, the areas of the 72 rectangular blocks are the same, the transverse side of the rectangular area is formed by 20 rectangular blocks which are regularly arranged in two rows, the vertical side of the rectangular area is formed by 16 rectangular blocks which are regularly arranged in two columns, and a plurality of rectangular blocks are etched into a hollow structure. The shape of the electromagnetic band gap structure is designed on the power layer of the power distribution network, so that the noise suppression low-frequency cut-off frequency is reduced, and the noise suppression frequency bandwidth range is increased; the size of the distribution network is automatically optimized through an automatic optimization method, and the noise suppression depth is increased.

The invention provides a short-time-delay circuit breaker and its opening circuit and operating mechanism. The operating mechanism includes an opening circuit. There is a first current-limiting resistor used to reduce the working current of the opening electromagnetic coil; the first current-limiting resistor is connected in parallel with an auxiliary switch that is closed when the circuit breaker is in the opening action and is turned off after the opening action is completed. In the technical solution provided by the present invention, the auxiliary switch is connected in parallel with the first current-limiting resistor. When the circuit breaker opens, the auxiliary switch is controlled to close. At this time, the voltage at both ends of the circuit breaker electromagnetic coil is higher than its rated voltage, and the circuit breaker can Quickly act to complete the opening; then turn off the auxiliary switch, at this time the first current limiting resistor is connected to the opening circuit to reduce the current in the circuit. Since both the first current-limiting resistor and the auxiliary switch are non-energy storage components, voltage fluctuations in the opening circuit will not be caused during switching.

The invention discloses a multifunctional three-phase voltage regulation device, which comprises an A phase voltage regulator, a B phase voltage regulator, a C phase voltage regulator, an A phase current transformer, a B phase current transformer, a C phase current transformer, a control unit, and a three-phase linkage and single-control knob, wherein a three-phase circuit is independently connected with the control unit through the A phase voltage regulator, the B phase voltage regulator, the C phase voltage regulator, the A phase current transformer, the B phase current transformer and the Cphase current transformer, and the three-phase linkage and single-control knob is connected with the control unit for switching between the three-phase linkage knob and a split-phase knob. By use ofthe device, three-phase synchronous voltage regulation can be realized, three-phase independent voltage regulation also can be carried out, a regulation way is flexible, the problem of terminal low voltage caused by an overlong courts power supply radius can be effectively solved, the problem of voltage fluctuation caused by peak and valley periods and seasonal electricity utilization can be solved, and practical application requirements are met.

The invention discloses a low-voltage power distribution network real-time voltage control method based on user side flexible resources. The method comprises the following steps: S10, establishing a voltage demand response model of the user side flexible resources; S20, carrying out user side edge node distributed real-time voltage control; and S30, optimizing an edge node voltage control rule based on reinforcement learning. According to the edge node distributed real-time voltage control method based on the artificial intelligence technology, the problems that voltage fluctuation is aggravated and overvoltage is caused by inverse power flow due to the fact that photovoltaic power generation output has the characteristics of intermittency and volatility are solved.

The invention discloses a ultra-wideband plane electromagnetic band-gap structure for suppressing high-speed circuit ground bounce noise. The structure comprises a power supply layer, a high-speed microwave dielectric layer and a ground layer which are connected from top to bottom in sequence; the power supply layer comprises a plurality of basic cyclic units which are connected by a plurality of resonators through a connecting bridge. According to the technical scheme, the structure has the beneficial effects that the problem of voltage fluctuation caused by the transient current change in a high-speed hybrid circuit system can be effectively solved; the synchronous switching noise produced in the power distribution network can be obviously suppressed; the interference to a radio frequency/ analog circuit in the hybrid circuit system can be reduced, and the resulting misoperation of a chip is avoided; a complementary split ring resonator is used to form the basic unit of the electromagnetic band-gap structure; therefore, the size of the unit structure can be reduced while the expected noise suppressing performance is reached; a cross connecting bridge is introduced, which can change the suppression depth, and thus the noise suppressing frequency band range can be expanded.

The invention discloses a subway train voltage fluctuation prevention device. The voltage fluctuation prevention device comprises a voltage transformer 1, a voltage detection module 2, a memristor control module 3, a memristor driving module 4 and a memristor Rm. When the voltage of the pantograph passes through the main transformer, the input voltage is changed, the voltage transformer 1 convertsa voltage signal into a numerical signal through the voltage detection module 2 and sends the numerical signal to the memristor control module 3, and the memristor control module 3 changes the memristor value of the memristor Rm through the memristor driving module 4, so that the stability of the input voltage is realized. The subway train voltage fluctuation prevention device provided can effectively solve the problem of voltage fluctuation existing in contact network power supply, improve the running stability of the subway train and improve the riding comfort of a subway.

The invention belongs to the technical field of power distribution, and discloses a direct-current micro-grid control system, a control method, a storage medium, equipment and application. According to the method, after rectifiers are connected in parallel, power values transmitted by lines can present economically distributed rectifier parallel modules in the lines with different parameters; rectified output direct-current sides of frequency converters are connected in parallel to form a direct-current bus, and the direct-current bus is connected to a direct-current bus module of a photovoltaic and energy storage link; and the direct currents rectified and output by the frequency converters are output to a parallel inverter module at a load side in a parallel inversion manner. According to the invention, the voltage fluctuation of the direct-current side is reduced, the power supply reliability is improved, the power can be economically distributed in lines with different parameters, the economy of an oil well power supply system is improved, the unified formulation of a voltage sag and short-time interruption treatment scheme is facilitated, the problem of low voltage caused by a long line and a heavy load is solved, load reverse power generation and unified energy feedback of photovoltaic subunits are facilitated, and the system is suitable for oil well power supply systems, port ship crane systems and other scenes.

The invention discloses a super-conduction and normal-conduction compound flat-wave current limiting reactor. The reactor mainly comprises a super-conduction inductance coil, a super-conduction switch combination, a forward wound normal-conduction inductance coil, a reverse wound normal-conduction inductance coil and a normal-conduction switch combination. A first super-conduction non-resistance switch in the super-conduction switch combination is connected in parallel with the super-conduction inductance coil. A second super-conduction non-resistance switch is connected in parallel with a super-conduction current limiting switch and then connected in series with the super-conduction inductance coil. The super-conduction switch combination and the normal-conduction switch combination are switched through the connection state of an inner switch to achieve combined serial and parallel connections among the super-conduction inductance coil, the super-conduction switch combination, the normal-conduction inductance coil and the normal-conduction switch combination, and accordingly, the super-conduction and normal-conduction compound flat-wave current limiting reactor with variable inductance values and variable resistance values is achieved. Application characteristics of single super-conduction reactors and single normal-conduction reactors are combined, efficient direct-current power grid smoothing and current limiting functions are provided, and the super-conduction reactor operation efficiency and the reactor economy are improved.

The invention discloses a sensor exciting circuit based on a D-type power amplifier, and the D-type power amplifier is applied to an inductive displacement sensor exciting circuit, so that the circuit loss is greatly reduced, and the efficiency is improved. Through the design of the amplitude stabilizing circuit with closed-loop control, the problem of voltage fluctuation after the D power amplifier is loaded is solved. And self-excitation generated by the circuit after closed-loop control is introduced into the amplitude stabilizing circuit is eliminated through a phase-leading correction link. For an inductive sensor system which has a high-power requirement or is sensitive to power consumption, the inductive sensor excitation circuit based on the D-type power amplifier can greatly reduce the measurement loss of the inductive sensor and improve the working performance of the inductive sensor.