103results about How to "Oscillation suppression" patented technology

The invention provides a broadband self-adaptive impedance remodeling method based on energy storage, which comprises the following steps of: dividing an impedance frequency band of an energy storage system according to analysis on a PLL (Phase Locked Loop), a voltage loop, a current loop and a filter, and constructing an improved self-adaptive impedance remodeling control strategy based on combination of active damping and virtual admittance based on the divided frequency band; according to the impedance remodeling control strategy, establishing an energy storage inverter system impedance model considering impedance remodeling; based on an impedance model, the frequency band overlapping effect between different frequency bands and between different control links is comprehensively considered, and the impedance near a system oscillation frequency point is remodeled through sequential optimization design of PLL control, virtual admittance control and active damping control. The purposes of broadband oscillation suppression of the diversified new energy cluster sending-out system and safe and stable operation of a power system are achieved.

The invention discloses a parameter value estimation method for xPos relative position coding and a multi-level relative position coding method and system, relates to the technical field of deep learning, solves the technical problem that a Transform model is relatively weak in robustness and relatively low in accuracy when processing a long sequence, and is characterized in that an exponential decay factor is introduced into xPos relative position coding, so that the robustness of the xPos relative position coding is improved. According to the method, exponential decay is used for adjusting the encoding mode of query and key vectors, oscillation of high-frequency components is restrained, the capturing capacity of the model for long-distance dependence is enhanced, and the length extrapolation capacity of the model in a non-length sequence task is further improved. Meanwhile, xPos relative position coding is used for intra-segment coding and inter-segment coding of a text sequence, double-layer coding is achieved, hierarchical structure information in the text sequence is captured by combining intra-segment coding and inter-segment coding, long sequences which are not seen in the training period can be processed more effectively, and the length extrapolation capacity of the model is improved.

The invention relates to an energy storage valve sub-module and a high-voltage direct-hanging energy storage system, a suppression circuit of underdamped oscillation is added in the energy storage valve sub-module, the suppression circuit is connected in series with a direct-current support capacitor, and a resistance-capacitance branch formed by connecting the suppression circuit and the direct-current support capacitor in series is connected in parallel with a power conversion unit and an energy storage unit. The suppression circuit can suppress the under-damped oscillation current generated by the energy storage valve sub-module at the switching state switching moment by adjusting the resistance value of the impedance in the energy storage valve sub-module, so that the under-damped oscillation current generated by the energy storage valve sub-module at the switching state switching moment is reduced; therefore, the damage of the underdamped oscillation current to the energy storage valve sub-module is reduced, and the reliability of the energy storage valve sub-module is improved.

The invention discloses a high-voltage direct-current power transmission grid-connected system stability control method and system, and relates to the technical field of power system control, and the method comprises the following steps: collecting the numerical information of a high-voltage direct-current power transmission system, and calculating the numerical information to obtain a receiving end output d-axis current reference value and a receiving end output q-axis current reference value; calculating a d-axis current control value through the d-axis current reference value, and then obtaining a d-axis modulation signal; calculating a q-axis current control value through the q-axis current reference value, and then obtaining a q-axis modulation signal; and performing grid-connected current control according to the d-axis modulation signal and the q-axis modulation signal, and driving a receiving-end converter of the high-voltage direct-current power transmission grid-connected system. According to the method, the new energy side output impedance remodeling can be realized without introducing an additional device, the dynamic performance of the high-voltage direct-current power transmission system is not influenced, and the stability of the high-voltage direct-current power transmission grid-connected system is improved.

The invention discloses an oscillation suppression method for grid connection of a wind power plant through a modular multilevel converter. The method comprises the following steps: introducing a harmonic component of an output current of a wind field side MMC converter as an additional control quantity into voltage control of the wind field side MMC converter, controlling the output current of the wind field side MMC converter to generate an output voltage, and suppressing oscillation when a wind power plant is connected to a grid through the MMC converter. According to the method, the oscillation of the output current of the wind power plant, namely the input current of the MMC at the wind field side, can be suppressed, and the control complexity is reduced.

The present invention relates to the field of information processing technology, and discloses a power regulation method and system for parallel modules of flexible equipment. The method and system analyze and process the real-time power data of each parallel module in the flexible equipment to obtain the power regulation target value and power curve of each parallel module. The power state of the parallel module to which it belongs is evaluated based on the power curve to determine the first parallel module, and the first parallel module is controlled to generate a power regulation instruction to send to the second parallel module adjacent to it, so that each second parallel module performs power regulation according to the power regulation instruction and in combination with its own corresponding power regulation target value to obtain a power regulation amount. A power regulation strategy based on predictive control is introduced according to the historical power data of each parallel module to predict the future power change trend of each parallel module, and the power regulation amount is corrected in advance to suppress oscillation in the power climbing process, so as to realize accurate power dynamic regulation of each parallel module in the flexible equipment.

The invention discloses a converter feedforward decoupling control method and system for improving low voltage ride through capability, and the method comprises the steps: firstly carrying out the dynamic lead compensation of a measurement voltage after d-q conversion, so as to actively offset the amplitude attenuation and phase delay introduced by hardware links, such as a low-pass filter, in a measurement link, and restore a real power grid voltage dynamic state; and based on the accurately compensated and corrected voltage signal, positive and negative sequence separation and feed-forward quantity calculation are carried out, and finally a reference voltage instruction is generated. In this way, it can be ensured that the input signal of feedforward control accurately reflects the instantaneous change of the power grid voltage, the dynamic response speed and precision of a control system are greatly improved, current overshoot and oscillation in the voltage drop period are effectively restrained, the low-voltage ride-through capacity of a converter is remarkably enhanced, and the stability of new energy grid connection is guaranteed.

The invention relates to the technical field of reactor cooling, and provides a cooling circulation loop and a marine natural circulation cooling system. The cooling circulation loop comprises a first cooling pipe, a second cooling pipe, a heat pipe, a heat exchanger and a storage chamber; phase change heat storage particles with the density smaller than that of seawater are arranged in the material storage chamber; the heat exchanger is provided with an ascending pipe, one end of the first cooling pipe is connected with the inlet end of the ascending pipe, the other end of the first cooling pipe is used for being connected with hot hydrazine seawater, one end of the second cooling pipe is connected with the storage chamber, the other end of the second cooling pipe is used for being connected with the hot hydrazine seawater, and the storage chamber is provided with a discharging port which is connected with the inlet end of the ascending pipe. One end of the heat pipe is connected with the outlet end of the ascending pipe, and the other end of the heat pipe is used for being connected with hot hydrazine seawater. According to the cooling circulation loop and the marine natural circulation cooling system, the defect that in the prior art, the natural circulation heat transfer capacity cannot be greatly enhanced in the mode that a bubble lifting device is additionally arranged in the ascending section of a natural circulation system is overcome.

The invention relates to the technical field of optical fiber wireless communication and mobile forward transmission, in particular to a digital analog optical fiber wireless forward transmission transmitting end parameter self-adaptive optimization method and system based on reinforcement learning. Decomposing the normalized wireless signal into digital parts of all levels and a final analog residual error part through multi-level modulation, and transmitting the digital parts and the final analog residual error part in a time division multiplexing manner; a receiving end represents inter-symbol interference caused by link nonlinear distortion and bandwidth limitation, and the signal-to-noise ratio of a recovery signal is calculated based on the error vector amplitude. Parameters of a transmitting end are optimized and modeled into a Markov decision process, states comprise rounding factors, scaling factors, constellation forming factors and pre-equalization filter tap coefficients of all levels, and actions are discrete increments of the parameters; a reinforcement learning agent is constructed by using a dual deep action value network, and training is updated in combination with experience playback and a target network. The reward function comprises a threshold satisfaction item and a signal-to-noise ratio change item; parameters are interactively updated in the training stage, and online self-adaptive adjustment is performed in the reasoning stage.

The invention relates to the technical field of power grid safety, in particular to a photovoltaic vector margin method active control parameter setting oscillation suppression method and system. Selecting a rotor loop as a forward channel link to obtain a compact form Heffron-Phillips model of a system considering photovoltaic grid connection; the method comprises the following steps: carrying out order reduction simplification on a compact form Heffron-Phillips model of a system considering photovoltaic grid connection at an ultra-low frequency oscillation frequency point; applying a vector margin method to give a frequency domain stability margin of the system; establishing a photovoltaic active power control link parameter setting optimization model; and solving the optimization model to obtain a designed active control link parameter value. According to the method, the frequency domain stability margin of the multi-input-multi-output photovoltaic grid-connected power system under the ultralow frequency oscillation can be given, the mathematical relationship of the stability margin is simple, and the effect of suppressing the ultralow frequency oscillation by carrying out optimization design on photovoltaic power generation active control link parameters is given.

The application belongs to the field of shaft coupling alignment technology, in particular to a shaft coupling alignment intelligent auxiliary system based on double laser displacement and MEMS gyroscopes, which adopts a mode of cooperative work of an active stable attitude measurement module and a space reference beacon module to establish a dynamic stable measurement reference unaffected by turning operation and environmental disturbance. The system can perceive and actively compensate for the slight attitude change of the measurement device in real time during the measurement process, ensure that the laser displacement data under all angles are collected under the same absolute space coordinate system, ensure the high consistency and accuracy of the multi-point measurement data, then use an intelligent calculation module to fuse the attitude feedback signal and the attitude reference signal to generate an attitude control instruction, and process the displacement measurement data collected by the double laser displacement sensors after the attitude is stabilized to calculate the centering deviation parameters, which helps to improve the efficiency, accuracy and automation level of the shaft coupling alignment work.

The utility model discloses a direct-drive electro-magnetic annular synchronous motor, and belongs to the technical field of large-scale synchronous motors. The motor comprises a split stator which is formed by splicing and fixing a plurality of stator petals along the circumferential direction; the block magnetic poles form a motor rotor, a plurality of independently-formed magnetic pole units are arranged at intervals in the circumferential direction, and each magnetic pole unit is directly and fixedly installed on the outer wall of the load rotating cylinder; the supporting and sealing structure is arranged at the axial end part between the split stator and the block magnetic pole and is used for sealing a gap between the split stator and the block magnetic pole; and the collector ring and brush carrier system is arranged at one axial end of the motor, and the output end of the collector ring and brush carrier system is electrically connected with the excitation windings of the block magnetic poles. According to the utility model, the split stator and the block magnetic pole structure are adopted, so that the transportation and field installation of the ultra-large motor are facilitated; the rotor is directly mounted on the outer wall of the milling cylinder to realize direct drive, a gear transmission link is omitted, the transmission efficiency is high, and operation is stable; a multi-layer sealing structure adapts to a high-dust environment, and the reliability is high; the speed regulation performance is good and the maintenance is convenient.

The application belongs to the technical field of robots, and discloses a three-dimensional force sensing-based detection and balance control method and system for a legged robot. The method comprises the following steps: determining the number of the leg of the multi-legged robot that slips according to a three-dimensional force signal of the multi-legged robot in contact with the ground; and adjusting the multi-legged robot in the following manner when slipping occurs: (1) adjusting the height of the center of mass of the multi-legged robot; (2) for the leg that slips, actively adjusting the joint stiffness and joint damping of the leg to relieve instantaneous impact; applying foot end acceleration and adjusting normal support force to suppress slipping; and adjusting the target foot landing point at the next time. Through the application, the balance of the robot can be quickly restored after slipping occurs, the risk of instability is reduced, and the stability of the robot in a complex environment is ensured.

The present invention discloses a method for suppressing motor oscillation of an asynchronous motor VF control, comprising the following steps: a frequency converter samples three-phase output current, obtains instantaneous reactive current of the asynchronous motor, extracts reactive current oscillation components, outputs an oscillation suppression calculation angle, and then outputs an oscillation suppression adjustment angle; at the same time, the frequency converter samples bus voltage, obtains bus voltage variation, and then outputs an oscillation suppression adjustment voltage; finally, the oscillation suppression adjustment angle and the frequency instruction are calculated by a second angle integrator to obtain an angle, and the oscillation suppression adjustment voltage and the frequency instruction are calculated by a VF curve calculation unit to obtain an output voltage, which is used for SVPWM modulation output. The present invention simultaneously detects the output current and bus voltage, adds an adjustment angle output controller and a universal adjustment unit, effectively speeds up the control response, realizes the optimal control adjustment output, and has an obvious suppression effect, which can meet the needs of parameter consistency for asynchronous motors of different capacities.

The utility model provides a kind of motor rotor of permanent magnet auxiliary reluctance synchronization belongs to motor rotor technical field, including rotor core, the shaft hole for connecting rotating shaft is opened in rotor core, multiple permanent magnets are equipped on rotor core, multiple magnetic barriers are equipped on rotor core, both ends of rotor core are equipped with end plate, multiple permanent magnets and multiple magnetic barriers are equipped with magnetic separation strip between, multiple damping grooves are opened in rotor core outer wall, multiple damping grooves are equipped with damping block, multiple end plates are equipped with balance block, multiple damping blocks are equipped with heat dissipation plate between, both sides of rotor core are equipped with magnetic conducting ring, both ends of rotor core and end plate outer wall junction are equipped with sealing pad.The device is by setting magnetic separation strip between permanent magnet and magnetic barrier, so that user can prevent the magnetic flux leakage between permanent magnet and magnetic barrier;After motor operation, the distribution of internal magnetic field of motor can be optimized by the effect of magnetic separation strip, so that user can obtain more stable motor operating condition.

The invention relates to the technical field of chargers, and discloses a high-efficiency charger based on NCP1342 and NV6136C. The high-efficiency charger comprises an input circuit, an RCD absorption circuit, a control and power conversion circuit, an output circuit and a feedback circuit. According to the invention, the input circuit, the RCD absorption circuit, the control and power conversion circuit, the output circuit and the feedback circuit work cooperatively to realize an efficient, stable and safe charging process; the input circuit guarantees the stability and safety of an input power supply based on an NTC thermistor, a fuse and a low-pass filtering network; peak and oscillation of power conversion are effectively suppressed based on the RCD absorption circuit, and circuit elements are protected; an NCP1342 chip is used for driving an NV6136C based on a control and power conversion circuit, efficient electric energy conversion and voltage regulation are achieved by means of a transformer, and meanwhile the safety of the protection function is enhanced; the output circuit ensures the quality of output electric energy through diode rectification and capacitor filtering; the feedback circuit accurately adjusts output, and the performance of the charger is comprehensively improved.

The invention discloses an adaptive sliding mode fault-tolerant control method and device for broadband oscillation of a new energy grid-connected system, and the method comprises the steps: obtaining a state variable matrix of the new energy grid-connected system, obtaining a sliding mode surface of a controller of the new energy grid-connected system according to the state variable matrix, and obtaining a sliding mode fault-tolerant controller if the sliding mode surface is stable. Through the adaptive sliding mode fault-tolerant control method and device for broadband oscillation of the new energy grid-connected system provided by the embodiment of the invention, effective suppression of broadband oscillation of the new energy grid-connected system can be realized.

This invention relates to a constant pressure control system for an optical cavity based on pump-valve coordination and water immersion sensing, and its active protection method. Belonging to the fields of precision instrument control and industrial automation, the system integrates an electronically controlled proportional valve and an air pump through a pump-valve coordinated pressure control unit. It dynamically adjusts the intake and exhaust flow rates based on an adaptive PID algorithm and a coordinated allocation function, achieving high-precision, rapid, bidirectional adjustment of the optical cavity pressure. Simultaneously, it employs a dual environmental sensing unit including visual perception and capacitive liquid level sensing, which executes constant pressure control and active anti-intrusion monitoring in parallel through an intelligent coordinated control unit. When visual detection identifies a risk of water intrusion, the system proactively limits the pump speed; when the capacitive sensor detects liquid water intrusion, it immediately executes an emergency shutdown. This solves the problem of difficulty in coordinating pressure control and safety assurance in traditional technologies, achieving a unified approach of long-term precise constant pressure and active contamination protection, significantly improving the system's reliability, safety, and intelligence level under complex operating conditions.

The invention discloses a hybrid photomultiplier coaxial output structure based on a microstrip line. The hybrid photomultiplier coaxial output structure comprises a semiconductor detector, a bonding wire, the microstrip line, a ground electrode, a lead pin, a medium, an outer conductor base and a detector lead pin. The semiconductor detector is used for receiving the photoelectrons converted by the photoelectric cathode and generating a current signal; the bonding wire is used for electrically connecting the semiconductor detector and the microstrip structure; the microstrip line and the ground electrode adopt gold-plated kovar alloy parts to form an in-tube microstrip structure; the guide pin and the detector guide pin are kovar alloy guide pins and form an inner conductor with a coaxial structure; the outer conductor base is a kovar alloy disc and forms an outer conductor with a coaxial structure; the medium is glass or ceramic. According to the coaxial output structure, a vacuum tube is of a 50-ohm microstrip structure, the exterior of the vacuum tube is of a 50-ohm SMA coaxial structure, and a complete 50-ohm coaxial line is formed by connecting a microstrip line and a guide pin together. The structure provided by the invention has the advantages of high transmission speed, small signal reflection and oscillation and the like, and is more beneficial to detection of ultrafast optical pulse signals.

The invention discloses a virtual synchronous generator control method based on angular acceleration in an island mode, which is suitable for an inverter for supplying power to an alternating current system, a direct current power supply supplies power to the inverter controlled by a VSG through a voltage stabilizing capacitor, and alternating current output by the inverter supplies power to the alternating current system after passing through an LCL filter; the VSG control method comprises transient damping control and angular acceleration feedback control and is used for restraining active power oscillation among the multiple VSGs connected in parallel, the frequency change rate of the system is effectively reduced, and therefore the problem that the system collapses due to the fact that electrical equipment is damaged due to the large frequency change rate is avoided. And particularly, an effect of suppressing an oscillation aggravation phenomenon caused by a constant-power load in an electric power system is achieved.

The utility model discloses a novel gear group formula absolute value encoder, including the shell, the four -around of shell left surface all welds have threaded hole post, and have the mounting seat of threaded hole post left side bolt fixing, the shell inside is connected with input shaft structure, and input shaft structure left side and mounting seat are inserted and connected, the right side fixed in the shell inside has the barrier disc structure, the right -hand member of shell can bolt connection has the maintenance cover and carries out the sealing, the surface bolt fixing of maintenance cover has the circuit board, and can electrically connected with magnetic rotation angle sensor on the circuit board. The utility model discloses through the setting of barrier disc structure, cooperation shell to the filling damping lubricating grease between first drive gear, second drive gear, third drive gear and fourth drive gear, absorbs and dissipates vibration energy like this, inhibits the oscillation and noise of gear under the impact and avoids being worn and torn and influences the detection precision.

This invention discloses an inverter control method for suppressing switching oscillations. The method includes: acquiring the inverter's port voltage signal; extracting a high-frequency oscillation signal representing the switching oscillation from the port voltage signal, and determining a target oscillation signal based on the high-frequency oscillation signal; integrating the voltage range of the target oscillation signal and the port voltage signal to obtain the inverter's reactive current increment; and controlling the inverter to output a corresponding reactive current based on the reactive current increment. This invention processes the input signal of the integral controller to output the required reactive current support current, thereby adjusting the inverter's reactive current output based on the reactive current support current, thus maintaining the inverter in stable operation within the non-VRT mode (normal operating mode) range and effectively suppressing switching oscillations.

The application discloses a kind of based on data-driven adaptive cycle engine multivariable sliding mode control method, belong to aero-engine control technical field, this method is based on a certain type of adaptive cycle engine, considering the influence of actuator, based on input, output data, the dynamic linearization data model of engine is established online;Three-variable model-free adaptive sliding mode controller based on sliding mode control algorithm is designed;Adaptive weight factor is introduced, the control conservative problem of controller when the controlled object parameter occurs large-scale change is solved, and the control effect is optimized;Finally, the algorithm designed is used to realize the multivariable steady control of adaptive cycle engine under different modes.The application can solve the problem that traditional sliding mode control of aero-engine depends on accurate mathematical model, ensure the control effect while having good real-time performance.

The embodiment of the invention provides a robot control method and device, electronic equipment and a storage medium, and relates to the technical field of robots. The robot control method comprises the steps that in response to collision of a robot, an expected joint angle is selected from joint angles of all joints of the robot at multiple historical moments, based on the current expected joint angle, according to a first determination mode, the impedance torque of the robot is determined, and according to the impedance torque of the robot, the robot is controlled. And calculating the output torque of the robot, controlling the robot to move according to the output torque of the robot, and returning to the step of selecting the expected joint angle from the joint angles of the joints of the robot at the plurality of historical moments. Therefore, according to the scheme, the robot can be effectively protected after collision happens to the robot.

The application discloses a kind of discrete series low distributed capacitance liquid cooling heat dissipation device and method, it belongs to electronic device heat dissipation technical field, heat dissipation device includes several heat dissipation units, the top of each heat dissipation unit is used to set power device, and two adjacent heat dissipation units are connected by cooling liquid pipeline;Each heat dissipation unit includes matrix and radiator, cooling liquid pipeline is through the inside of matrix, the top center of matrix is equipped with mounting hole, and mounting hole is equipped with radiator, and the lower half of radiator is inserted into the inside flow channel of cooling liquid pipeline, and the top of radiator is used to place power device.The application adopts discrete series heat dissipation unit structure, cooling liquid pipeline is through each unit matrix, and the lower half of radiator is inserted into the inside flow channel of pipeline, and each unit independently corresponds a power device.Solve the parasitic distributed capacitance problem caused by shared metal radiator, eliminate resonance loop, inhibit switching oscillation, reduce loss, ensure that heat dissipation is uniform and dynamic equalization, improve the stability and service life of high-voltage series module.

The present disclosure relates to the technical field of vehicle intelligent driving, and provides a vehicle torque control method and a vehicle. When it is detected that a gear position of a vehicle changes and an accelerator pedal opening degree changes, a first engine request torque at a current moment and a second engine request torque at a previous moment of the current moment are acquired. A remaining power of the vehicle is acquired, a target change gradient is determined according to the first engine request torque, the second engine request torque and the remaining power of the vehicle, and the engine request torque of the vehicle is controlled based on the target change gradient. When the driver performs a throttle opening or throttle closing operation during the gear shifting process, the present disclosure adjusts the change gradient of the engine request torque correspondingly, provides a buffer time for the engine response, effectively suppresses the mutation and oscillation of the driving force, guarantees the smoothness of the vehicle torque, and further improves the user's vehicle experience.

The invention belongs to the technical field of electric power engineering. The invention provides a voltage source type new energy power generation broadband oscillation suppression method and system. A phase-locked loop (PLL) and a power grid voltage vector are kept synchronous; obtaining a voltage d-axis component and a voltage q-axis component of a grid-connected port of a grid-connected inverter of a voltage source converter in a two-phase synchronous rotating coordinate system by combining a power grid voltage phase angle theta obtained by a phase-locked loop (PLL), and calculating a d-axis output voltage and a q-axis output voltage of a current regulator; obtaining a three-phase voltage modulation wave of the voltage source converter according to the power grid voltage phase angle theta, the voltage d-axis component, the voltage q-axis component, the d-axis output voltage and the q-axis output voltage; according to the invention, the grid-connected stability is improved, and effective suppression of broadband oscillation of voltage source new energy power generation is realized.

This invention discloses a high-voltage nanosecond pulse shaping device and method based on magnetic devices. The device includes: a first magnetic transmission line and a second magnetic transmission line, with their input ends connected in parallel and connected to an initial pulse source; the output end of the first magnetic transmission line is connected to a load terminal; the output end of the second magnetic transmission line is short-circuited to ground; the first magnetic transmission line includes a first magnetic ring arranged along the axial direction and an outer magnetic field coil; the second magnetic transmission line includes a second magnetic ring arranged along the axial direction. Based on the current-dependent nonlinear permeability effect of the magnetic ring, this device simultaneously achieves pulse rise time compression, fall time truncation, pulse width shortening, and suppression of pre-pulse and tail oscillations through the rising sharpening effect of the first magnetic transmission line and the falling truncation effect of the second magnetic transmission line. This overcomes the limitation of single nonlinear transmission line or magnetic switching technology, which can only optimize single pulse parameters, and can obtain high-quality pulse waveforms at the load terminal.

This invention discloses a method for suppressing current imbalance and power oscillations based on a virtual synchronous generator (VSG). First, a traditional VSG loop model is established and its parameters are tuned. Then, the positive and negative sequence components of the grid-connected voltage, filter capacitor terminal voltage, and grid-connected current are extracted using a time-delay cancellation method and transformed to a synchronous rotating coordinate system. An equivalent VSG grid-connected loop model is added to the traditional VSG model. The traditional active power and extended reactive power calculation methods are transformed to the synchronous rotating coordinate system, and a reference value for the grid-connected current that suppresses the second harmonic component of the power is derived. A PI controller is used to make the actual grid-connected current track the reference value, and the output modulated wave drives the inverter. This invention can simultaneously suppress the second harmonic oscillations of active and reactive power, improve grid-connected current imbalance and distortion problems, while retaining the active power frequency regulation, reactive power voltage regulation, and inertial support characteristics of the VSG, thus improving the stability and power quality of the new energy grid-connected system.

Provided is a technique capable of suppressing oscillation noise of a semiconductor device and suppressing mirror noise. Included are: a switching device configured to conduct or open a state between a drain terminal and a source terminal based on a voltage applied between a gate terminal and the source terminal; a drive circuit including a first switch element and a second switch element, the drive circuit being configured to open and close the first switch element and the second switch element in accordance with a predetermined control signal, and output a drive voltage for driving the switching device to the gate terminal via an output end; a clamp circuit including a third switch element configured to conduct between a reference potential of the drive circuit and a connection point of a path connecting the output end of the drive circuit and the gate terminal based on a comparison result between a threshold potential generated based on the reference potential of the drive circuit and a potential at the connection point; and a ferrite inductor provided immediately near the output end of the drive circuit, and having one end connected to the output end and the other end connected to the connection point.