62 results about "Diode rectifier" patented technology

The invention discloses a hybrid direct current transmission power coordination control device and a control method and equipment thereof, and relates to the technical field of offshore power generation, and the hybrid direct current transmission power coordination control device comprises a diode rectifier unit and a first modular multilevel converter which are connected with an offshore wind plant, the sending-end converter station is used for converting alternating current generated by an offshore wind plant into direct current and outputting the direct current; the second modularized multi-level current converter is connected with the diode rectifier unit and the land power grid and is used for restoring the direct current into the alternating current and transmitting the alternating current to the land power grid; and the control module is connected with the first modular multilevel converter and is used for controlling the DC voltage of the first modular multilevel converter based on the fluctuation power according to the transfer relation between the active power and the DC voltage of the sending end converter station, so that the higher requirement of the rated capacity of the MMC in the related technology is met, and the reliability of the MMC is improved. And the engineering construction cost is increased.

The utility model discloses a generator control device, a gas generator system and an aircraft, the generator control device comprises an automatic control unit, a sensing unit and a rectification unit, the generator is connected with a turbine of a turbojet engine through a main shaft, and the generator is connected with electric equipment. The automatic control unit is connected with an oil pump of the turbojet engine, electric equipment, the sensing unit and the rectifying unit, the sensing unit comprises a rotating speed sensor connected with a main shaft, the rectifying unit comprises a diode rectifier bridge and a buck-boost converter, the generator is connected with the diode rectifier bridge, and the diode rectifier bridge is connected with the buck-boost converter. And the buck-boost converter is connected with electric equipment. The power supply can stably output electric energy according to the requirements of electric equipment, ensures that the output voltage is stable, and meets the requirements of the electric equipment.

This invention belongs to the field of high-voltage direct current (HVDC) transmission in power systems, specifically relating to a method, equipment, and medium for AC fault ride-through control at the sending end of a new energy source transmission system via a DRU-HVDC. When an AC fault occurs at the sending end, the grid-side converter of the new energy power station exits the active, reactive, and voltage loops, retains the inner current loop, and switches to maximum current output mode, locking the frequency to the rated value. Simultaneously, the receiving-end converter station exits the DC voltage outer loop, retains the inner current loop, and controls the DC current according to preset commands. During the fault duration, the diode rectifier station remains on and transmits maximum active power. After the fault is cleared, the output current of the new energy power station is reduced to the rated value, and then the power and voltage control loops are restored; the receiving-end converter station resumes constant DC voltage operation. This invention achieves maximum power control through preset commands. By controlling and switching between the new energy power station and the receiving-end converter station, the DRU is effectively maintained on, improving the active power transmission capacity and system recovery speed during faults.

The invention discloses a rectifier-diode-free single-inductor boost energy recovery circuit and a control method thereof, and relates to the technical field of electric energy conversion circuits. The circuit topology comprises a switching tube S1, a switching tube S2, an inductor L, a diode D1, a diode D2 and an output capacitor Co. One end of the alternating current input side is connected with the drain electrode of the switching tube S1, the positive electrode of the output capacitor Co and one end of the load RL; the source electrode of the switching tube S1 is connected with one end of the inductor L and the cathode of the diode D1; the negative electrode of the output capacitor Co is connected with the positive electrode of the diode D1, the other end of the load RL and the positive electrode of the diode D2; the other end of the AC input side is connected with the drain electrode of the switch tube S2, and the source electrode of the switch tube S2 is connected with the other end of the inductor L and the cathode of the diode D2. According to the rectifier-diode-free single-inductor boost energy recovery circuit, by completely eliminating a diode rectifier bridge, energy loss is reduced, and the circuit structure is simplified.

The application discloses a high-voltage direct-current converter topology and a control method thereof, and belongs to the technical field of power generation, power transformation or power distribution. The topology is composed of a high-voltage side filter inductor, a three-phase MMC inverter circuit, a three-phase leakage inductor, a three-phase transformer, a three-phase diode rectifier circuit, a medium-voltage side filter inductor and a medium-voltage side filter capacitor. The topology structure of the application can realize higher reliability, lower cost and smaller size by the relatively mature high-voltage side modular structure and the medium-voltage side diode series connection technology. By precisely controlling the three-phase current to be a positive-negative half-cycle symmetrical trapezoidal current, reliable commutation of the three-phase rectifier diode is realized, and meanwhile, smooth direct-current is synthesized on the high-voltage side and the medium-voltage side, so that the operation efficiency of the converter and the port power quality are significantly improved, and the filter size is reduced.

This invention relates to a triple-multiplier auxiliary circuit for a series-type 12-pulse rectifier, belonging to the field of power electronics technology. It solves the problems of existing pulse multiplier circuits used in the DC side of series-type 12-pulse rectifiers, which suffer from large turns ratios in the primary and secondary windings of the auxiliary transformer, resulting in significant leakage inductance and poor harmonic suppression. Furthermore, the large turns ratio and the presence of numerous diodes in the multiplier circuit also contribute to its complex structure and increased manufacturing difficulty. This invention's triple-multiplier auxiliary circuit, by adjusting the turns ratio of the primary and secondary windings of each auxiliary transformer, allows the auxiliary diodes D... f1 and auxiliary diode D f2 The conduction times of the two diodes are 1 / 3 or 1 / 4 of their respective input voltage cycles, enabling the first diode rectifier bridge and / or the second diode rectifier bridge to operate simultaneously or alternately, thereby achieving a pulse multiplication of 3 times. This invention is mainly used to achieve pulse multiplication.

The application provides a DRU-LFAC system and a wind turbine generator network type control and black start control method, and relates to the technical field of wind power generation. The offshore wind farm is a permanent magnet direct drive full power wind turbine generator, low frequency alternating current is sent to the onshore back-to-back converter through a low frequency side subsystem, the onshore back-to-back converter converts the low frequency alternating current into high frequency alternating current and sends the high frequency alternating current into an onshore power grid, the onshore back-to-back converter comprises a twelve-pulse diode rectifier unit and a modular multilevel converter, and a filter is used for reactive power compensation. The DRU-LFAC system has active power-voltage coupling characteristics and reactive power-frequency coupling characteristics. The application solves the problems that the low frequency side power characteristics of the current DRU-LFAC system are different from those of the traditional power system and cannot be effectively analyzed, the current traditional wind turbine generator control strategy is not applicable to the DRU-LFAC system, and the offshore wind farm cannot be started through a conventional process due to the unidirectional conduction characteristics of the DRU.

The invention discloses an offshore wind power DR-MMC direct current sending-out converter and a control method thereof, and efficient wind power direct current sending-out is realized through a structure that a diode rectifier (DR) is connected with a direct current side of an auxiliary converter in parallel and an alternating current side is connected with a grid through a transformer. The auxiliary converter is composed of a high-voltage series submodule branch (HVSB), a low-voltage three-phase series modular multilevel converter (LV-SC-MMC) and an LC filter, the LV-SC-MMC adopts a three-phase modular full-bridge series structure, each phase comprises four bridge arms, and the alternating current side is in triangular connection through three single-phase transformers. According to the control method, variable-amplitude high-frequency voltage (the amplitude is dynamically adjusted along with a fundamental component) is injected into an LV-SC-MMC bridge arm, on the premise that the number of sub-modules is not increased, the peak value / valley value of the bridge arm voltage is not changed, and meanwhile power balance control is completed by using the superposition characteristic of the high-frequency voltage on the direct current side and combining HVSB voltage adjustment. The device effectively reduces the number of sub-modules, guarantees the quality of AC-side electric energy, and is suitable for offshore wind power low-cost and compact DC transmission scenes.

The invention discloses a hybrid offshore wind plant black-start method based on a DRU-HVDC sending-out system, and belongs to the technology of a power transmission system due to the economical efficiency and the reliability of the power transmission system. In order to solve the problem that a control strategy of a DRU-HVDC power transmission system based on a diode rectifier unit is still challenged in the black-start process of an offshore wind plant, the invention aims to solve the black-start problem of an offshore wind plant low-frequency alternating current collection and direct current sending-out system adopting the DRU-HVDC and realize stable grid connection and mixed operation of wind turbine generators after starting. The control method comprises the steps that a switchable control strategy is provided, undisturbed switching between a GFM operation mode and a GFL operation mode is supported, after starting, the system can stably operate in the mixed mode of the GFM operation mode and the GFL operation mode, and a reliable black-start and mixed operation solution is provided for an open-sea wind power plant without synchronous power supply support.

The application discloses a topology structure and a control method of a bipolar composite offshore converter station, belongs to the technical field of offshore power transmission and distribution, and aims at solving the problems of large volume, complex structure and poor system reliability of the existing offshore wind power. The bipolar composite offshore converter station comprises a positive pole and a negative pole; the positive pole adopts a half-bridge modular multilevel converter topology structure, the negative pole adopts a diode rectifier topology structure, the two topology structures are connected in parallel at an alternating current side and are connected in series at a direct current side, and a direct current connection point is used as a grounding pole to form a symmetric bipolar structure. The topology structure of a shore converter station comprises: the positive pole and the negative pole both adopt a half-bridge modular multilevel converter topology structure. The control method comprises the following steps: when a direct current of the grounding pole increases from zero, an alternating current voltage rated value of the offshore converter station is added with a fine adjustment amount, the added value is used as a given value of a d-axis voltage ring of a wind turbine, the direct current of the grounding pole is kept as zero, power balance control of the positive pole and the negative pole is realized, and the application is used for the offshore converter station.

The application discloses a kind of hybrid offshore wind power bipolar flexible transmission system power coordination control methods.For sending end negative converter adopts diode rectifier hybrid offshore wind power bipolar flexible transmission system, by adjusting the active power flexible distribution between bipolar by negative MMC DC bus voltage of receiving end.Compared with the existing method, the scheme can coordinate the power distribution between bipolar, maintain the stable operation of offshore ac grid, and has good application prospect.

The invention provides a partial-capacity medium-voltage flexible interconnection device and a fault current-limiting control method, and belongs to the technical field of medium-voltage power distribution network flexible interconnection, and the device comprises a power frequency isolation transformer, a power flow transfer module, a fault protection module, and a fault current-limiting module formed by connecting a diode rectifier bridge and a thyristor in parallel. During normal operation, the power frequency isolation transformer provides isolation to ensure that the power flow transfer module does not cause loss due to generation of leakage current, and meanwhile, a thyristor SCR1A of the fault protection module is turned off to ensure normal power flow adjustment of the series converter module; when a power grid line breaks down, devices of the series module are all locked, meanwhile, the thyristor SCR1A is rapidly switched on so as to bypass the series module, the thyristor SCR2A of the fault current limiting module is switched off, and the diode rectifier bridge is connected to the line in series and blocks fault current. The device overcomes the defects that a traditional device is high in cost and needs complex protection, gives consideration to efficiency and compactness, and is suitable for low-cost flexible power flow control of the medium-voltage power distribution network.

The utility model belongs to the field of detection devices, and discloses switch machine diode rectifier stack detection equipment which comprises a base and an adjusting assembly, a placing frame is fixedly connected to the base, a plurality of placing grooves arranged at equal intervals are formed in the top end of the placing frame, an installation block is arranged on the upper side of the placing frame, and an electric push rod is fixedly connected to the top end of the base. The output end of the electric push rod is connected with the mounting block, the interior of the mounting block is fixedly connected with a power source, the two ends of the mounting block are fixedly connected with a plurality of conducting rods, and the conducting rods are connected with the power source. According to the invention, the plurality of detection blocks are in butt joint with the two ends of the diode automatically, and voltage is applied to detect the diode, so that unified fixation and unified detection of the plurality of diodes can be realized quickly, tedious steps are not needed, manual interference is reduced, and the detection efficiency is improved while the detection accuracy is improved.

The utility model discloses a frequency conversion inverter power supply for a subway and subway power supply equipment. The frequency conversion inverter power supply comprises an alternating current power supply circuit, a direct current power supply circuit, a first capacitor and a first inverter circuit, the AC power supply circuit comprises a first diode rectification circuit. The direct-current power supply circuit comprises a second inverter circuit and a second diode rectifying circuit; the input end of the first diode rectifying circuit is connected with the alternating current output end; the input end of the second inverter circuit is connected with the direct current output end, and the output end of the second inverter circuit is connected with the input end of the second diode rectifying circuit; the output end of the first diode rectification circuit and the output end of the second diode rectification circuit are connected with the first capacitor and output direct current to the first capacitor. The first capacitor is connected with the input end of the first inverter circuit and discharges to the first inverter circuit; and the output end of the first inverter circuit is connected with a load. Through reverse cut-off of the diode, smooth switching of power supply from alternating current and direct current to a load is realized, the overall cost is reduced, and the service life of the circuit is prolonged.

The application relates to the field of wind power generation and direct current transmission technology, in particular to an offshore wind power direct current transmission system and a starting method thereof. The starting method comprises the following steps: using a negative voltage output function of an offshore direct current voltage variable type conversion module and a shore direct current voltage variable type converter to complete black start of a first offshore wind turbine set; using an alternating current output voltage controllable function of the offshore direct current voltage variable type conversion module and a low voltage ride through function of an offshore wind turbine to make a diode rectifier module access an offshore alternating current power grid in a mode of starting from an initial voltage and rising at a preset rising rate; and connecting offshore wind turbines in an offshore wind farm except the first offshore wind turbine set to the offshore alternating current power grid by controlling the offshore direct current voltage variable type conversion module and the shore direct current voltage variable type converter. The application can complete starting of the offshore wind power direct current transmission system, and the starting process is stable and free of impact.

The application discloses a diamond high-heat-conductivity substrate self-aligned anode ultra-wide band gap semiconductor diode rectifier device and a preparation method thereof. The device comprises a gallium oxide epitaxial wafer on a diamond substrate, an ion implantation area is arranged at an upper end of the gallium oxide epitaxial wafer, a cathode electrode is prepared on the ion implantation area, an anode electrode is prepared at another upper end of the gallium oxide epitaxial wafer on the diamond substrate, the ion implantation area reduces the ohmic contact resistance between the cathode electrode and the gallium oxide epitaxial wafer on the diamond substrate, and the anode electrode forms a Schottky contact with the gallium oxide epitaxial wafer on the diamond substrate. The preparation method comprises the following steps: pretreating the gallium oxide epitaxial wafer on the diamond substrate; ion implantation; preparing the cathode electrode and the anode electrode; self-aligned anode etching and in-situ annealing; and finally forming the gallium oxide self-aligned anode diode on the diamond. The application simplifies the device preparation process steps and improves the breakdown voltage of the device.

This invention belongs to the field of rectifier technology and proposes a ripple suppression compensation controller and its control method for diode rectifier bridges. It mainly includes: a voltage sampling module for acquiring input and output voltages; a hybrid main controller module, including an RC controller, a PI controller, and a PR controller. The input of the RC controller is connected to a voltage deviation, which is then processed and input to the parallel PI and PR controllers. After processing by the PI and PR controllers, a control signal is generated, and the phase shift angle in the control signal is adjusted; a duty cycle compensator module is used to receive the acquired input voltage and reference voltage, calculate the compensation duty cycle, and take its negative value; and a PWM generator module is used to phase-shift the drive signal between the two half-bridges in the phase-shifted full-bridge according to the adjusted phase shift angle and the negative compensation duty cycle, generating a phase-shifted drive signal, which is then input to the two half-bridges in the phase-shifted full-bridge.

The invention discloses an offshore wind power direct current sending-out system and a black start method based on the offshore wind power direct current sending-out system, and belongs to the field of offshore wind power. The system comprises an offshore wind power plant, a diode rectification unit, a second modular multilevel converter, a first modular multilevel converter, a step-down transformer and an alternating current power grid; the first modularized multi-level converter reduces the valve side voltage through a small-capacity step-down transformer, low direct-current side voltage is established, and after the diode rectification unit is bypassed, the second modularized multi-level converter obtains energy and charges through the low-voltage direct-current side. After the second modular multilevel converter is put into use, the system is gradually boosted and is finally stabilized at the rated voltage, all the fans are successfully connected and stably run, and black start is completed. By implementing the application, the problem of complex structure of the offshore wind power direct current sending-out system in the black start function in the prior art can be solved.

The utility model discloses a three-phase balanced safe heating system. The system comprises a three-phase power supply, an inlet wire contactor, a three-phase diode rectifier bridge, a choking coil, a silicon controlled rectifier, a temperature controller, a thermocouple and a heating rod. When the inlet wire contactor is closed, the three-phase power supply supplies power to the three-phase diode rectifier bridge, three-phase alternating current is rectified into direct current through the three-phase rectifier bridge, and the direct current is limited by the choking coil and then supplies power to the heating rod through the silicon controlled rectifier. The thermocouple measures the temperature of the heated pipe in real time and transmits a temperature signal to the temperature controller; the temperature controller compares the set temperature with the temperature measured by the thermocouple and outputs a corresponding adjusting signal, the adjusting signal is applied to the control electrode of the silicon controlled rectifier to control the magnitude of the output current of the silicon controlled rectifier, and the output current of the silicon controlled rectifier acts and heats after flowing through the heating rod. According to the utility model, equipotential matching can be realized, safety risks are reduced, three-phase power utilization balance is realized, and harmonic interference to a power grid is avoided, so that the quality and the yield of the geothermal heat insulation pipe are improved.

The invention provides a power factor correction circuit, a redundancy protection method thereof and a terminal. The circuit comprises a diode rectifier bridge, a power inductor, a first switch tube, a second switch tube, a fifth diode, a sixth diode, a first direct current support capacitor, a second direct current support capacitor, a first resistor and a second resistor. The power inductor is respectively connected with the diode rectifier bridge and the first switch tube; the first switch tube and the second switch tube are connected in series, the first direct-current support capacitor and the second direct-current support capacitor are connected in series, the first resistor and the second resistor are connected in series, and the switch tubes, the direct-current support capacitors and the resistors which are connected in series are connected in parallel. The redundancy protection method comprises the steps of sampling circuit current and judging whether the circuit is cut off or not according to the magnitude of the current. According to the invention, through the arrangement of the double switch tubes and the double diodes and cooperative control thereof, more efficient and more working types of switching modes are realized, so that the voltage stress of the switch tubes and current ripples during switching are reduced.

This application provides a DC transmission system and its fault protection method, relating to the field of flexible DC transmission technology. The system includes a renewable energy power station and energy storage system on the generation side, a diode rectifier unit, and a modular multilevel converter. The diode rectifier unit is connected to the generation side via an AC transmission line and to the modular multilevel converter via a DC transmission line. The modular multilevel converter is connected to the power grid. The method includes: detecting that the current in the DC transmission line exceeds a threshold, determining that a system fault has occurred; controlling the modular multilevel converter to reduce the voltage of the DC transmission line, blocking the energy feed from the grid to the DC transmission line; controlling the energy storage system to adjust the voltage of the AC transmission line, reducing the current fed from the generation side to the diode rectifier unit; and controlling the DC transmission system to restart after a first preset time, restoring energy transmission. This application effectively protects the system during faults without significantly increasing costs.

The invention relates to an offshore wind power hybrid direct current sending-out system based on reconfigurable topology and a control method. The system comprises a diode rectification unit, a modular multilevel converter unit, a direct current bus, a topology reconfiguration router and a controller. The topology reconstruction router comprises first to fifth switches, and the controller is configured to control the on-off states of the first to fifth switches, so as to change the connection topology formed by the diode rectification unit, the modular multilevel converter unit and the DC bus. And the system is switched among an MMC independent operation mode, a parallel operation mode or a series operation mode. According to the invention, the economical efficiency of the diode rectification unit and the controllability of the modular multilevel converter can be taken into consideration, and the operation efficiency and flexibility of the system in a full power range are remarkably improved.

The application provides a low-voltage-drop rectifier bridge circuit with a wide voltage input range, comprising a diode rectifier circuit, a low-voltage-drop auxiliary structure and other load circuits; the input end of the diode rectifier circuit is connected with an AC input signal, and the output end outputs a rectified positive power rail and a reference ground; the input end of the low-voltage-drop auxiliary structure is connected in parallel with the input end of the diode rectifier circuit to the AC input signal, the output end is connected to the positive power rail and the reference ground, and the control signal input end receives a high-side control signal and a low-side control signal; the input end of the other load circuits is connected to the output end of the diode rectifier circuit and the low-voltage-drop auxiliary structure, and the output end outputs the high-side control signal and the low-side control signal to the control signal input end of the low-voltage-drop auxiliary structure. The application clamps the AC signal with a wide voltage input range to a low-voltage domain by using a high-voltage MOS, and selects the corresponding side channel through a cross-coupled circuit structure, so as to reduce the forward voltage drop when the diode is turned on.

The invention provides a low-voltage-drop rectifier bridge circuit with a wide voltage input range. The low-voltage-drop rectifier bridge circuit comprises a diode rectifier circuit, a low-voltage-drop auxiliary structure and other load circuits, the input end of the diode rectification circuit is connected with an AC input signal, and the output end outputs a rectified positive power rail and a reference ground. The input end of the low-voltage-drop auxiliary structure and the input end of the diode rectifying circuit are connected in parallel to an alternating current input signal, the output end is connected to a positive power rail and a reference ground, and the control signal input end receives a high-side control signal and a low-side control signal; the input ends of other load circuits are connected to the output ends of the diode rectification circuit and the low-voltage-drop auxiliary structure, and the output ends of the other load circuits output high-side control signals and low-side control signals to the control signal input end of the low-voltage-drop auxiliary structure. The high-voltage MOS is used for clamping an alternating current signal in a wide voltage input range to a low-voltage domain, and a channel on the corresponding side is gated through a cross-coupled circuit structure, so that the forward voltage drop when the diode is conducted is reduced.

The application discloses an LED lamp panel with a built-in rectifier bridge, comprising a lamp panel body, a light emitting diode rectifier circuit connected with a power port is arranged in the lamp panel body, the light emitting diode rectifier circuit is provided with a first input branch, a second input branch, an intermediate branch, a positive output branch and a negative output branch, the output end of the first input branch and the output end of the second input branch are connected with the input end of the intermediate branch respectively, the output end of the intermediate branch is connected with the input end of the positive output branch and the negative output branch respectively, and the output end of the positive output branch and the output end of the negative output branch are used for outputting a rectified current. The LED lamp panel of the application is provided with the light emitting diode rectifier circuit, without an external rectifier bridge stack or other rectifier devices, so that rectification can be realized, compared with a traditional LED lamp panel with an external rectifier bridge stack, the number of flying wires is reduced, the process of manual welding of the flying wires is saved, and the safety hazard of poor contact caused by virtual welding or welding separation during manual welding of the flying wires is avoided.

Disclosed in the embodiments of the present disclosure are a power-asymmetric bidirectional direct-current converter, and a direct-current power transmission system. The power-asymmetric bidirectional direct-current converter comprises: a first fully controlled circuit, a transformer, a diode rectifier circuit and a second fully controlled circuit, wherein the first fully controlled circuit is used for converting a first direct-current voltage into a first alternating-current voltage or converting the first alternating-current voltage into the first direct-current voltage and outputting same; the transformer is used for transforming the voltage level of the first alternating-current voltage or transforming the voltage level of a second alternating-current voltage; the diode rectifier circuit is used for converting the second alternating-current voltage obtained by means of transformation into a second direct-current voltage and outputting same; and the second fully controlled circuit is used for converting the second direct-current voltage into a second alternating-current voltage and transmitting same to the transformer.

This invention discloses a hybrid converter valve topology and control method suitable for DC transmission from offshore wind power, belonging to the field of new energy power generation and DC transmission technology. This topology connects a three-phase adjustable reverse voltage cascaded bridge arm in series with a three-phase diode rectifier bridge arm. This invention employs a half-cycle energy balance overmodulation control strategy, enabling the system to operate stably at unity power factor and eliminating voltage ripple on the DC side. The topology is simple in structure, requires no additional filtering stage, and significantly improves power density and semiconductor device utilization while reducing engineering implementation difficulty.

The application discloses a kind of excitation system multi-mode starting control loop and method, the control loop includes: synchronous generator G, electric brake circuit, excitation starting circuit, the electric brake circuit includes electric brake power supply, electric brake transformer ZDB, electric brake alternating current circuit breaker S103, rectifier bridge SCR and direct current magnetic field circuit breaker S101, the electric brake power supply is connected to electric brake alternating current circuit breaker S103 by electric brake transformer ZDB, then to rectifier bridge SCR;The direct current that the rectifier bridge SCR rectifies after output is connected to the rotor of synchronous generator G through direct current magnetic field circuit breaker S101;The excitation starting circuit includes AC excitation power supply, diode rectifier bridge, excitation contactor K1, fuse F01 and F02;The application guarantees the success rate of each mode starting for the first time, and eliminates the hidden trouble brought by temporary change of external loop for test under test mode.

This invention relates to the field of thermoacoustic linear generators, and provides a thermoacoustic engine-driven turbine expansion power generation system. The thermoacoustic engine-driven turbine expansion power generation system includes a thermoacoustic engine unit, an acoustic diode rectifier unit, and a turbine expansion power generation unit. This thermoacoustic engine-driven turbine expansion power generation system combines the advantages of high efficiency and no moving parts in thermoacoustic engines with the mature technology and high power density of turbine expansion power generation, constructing a novel thermoacoustic-electric conversion technology solution. It breaks through the technological path dependence of existing reciprocating linear generators, effectively solving the problem that existing thermoacoustic linear generators cannot meet the demand for high-power generation, reducing technical difficulty and manufacturing costs, and has a wide range of applications, with good environmental benefits and economic value.

A residual voltage detection circuit, mainly suitable for residual voltage detection of terminal feeder, comprising a transformer for transforming voltage of the terminal feeder and receiving a residual voltage signal; a diode rectifier circuit for rectifying current processed by the transformer; a transistor control circuit for controlling a switch of a latching relay circuit; the latching relay circuit for realizing control of the transistor control circuit, an output end of the latching relay circuit being connected to a processor; an optocoupler circuit for controlling charging of the relay control circuit; a transformer for collecting a first signal of the terminal feeder; an analog-to-digital conversion chip for analog-to-digital conversion of the signal; a driving circuit for driving the optocoupler circuit to switch; the processor for controlling the driving circuit; beneficial effects: the residual voltage detection circuit can work normally in both cases of power loss of the terminal feeder and normal operation of the terminal feeder, the reliability of residual voltage detection is improved, and the hardware circuit is simplified.