31 results about "Three phase rectifier" patented technology

The invention provides an impedance scanning device based on network side voltage dynamic compensation under a three-phase voltage imbalance working condition, and relates to the technical field of new energy station power electronic converter topology and control, the device comprises a three-phase rectifier, a direct current bus capacitor, an inverter, a voltage compensation device, a frequency sweeping device, a circuit breaker and a series transformer part, the three-phase rectifier is connected in series with inverters of the voltage compensation device and the frequency sweep device, a secondary side of a series transformer of the voltage compensation device is connected in series with a network side, a secondary side of a series transformer of the frequency sweep device is connected in series with a grid-connected point, and a primary side of the series transformer is connected to the inverters and is coupled to a secondary side of the series transformer; according to the device, the power grid side voltage is rectified through the voltage compensation unit and is compensated to the grid side after being subjected to single-stage inversion transformation, voltage compensation is achieved through the energy of a power grid when the voltage is unbalanced, and an external energy source or an interference source does not need to be introduced. After compensation, the accuracy of the frequency sweeping result is obviously improved.

A DFIG wind power facility configured to be operated during grid faults is provided. The wind power facility includes a Doubly-Fed Induction Generator, a control system, an electric converter, a short-circuit controlled switch to selectively short-circuit the stator and a Stator Neutral Brake Chopper coupled to the stator. The DFIG includes a rotor and a stator, the stator including at least one three-phase winding. The electric converter includes a Machine Side Converter, a Grid Side Converter and a DC link connected therebetween. The SNBC includes a three-phase rectifier including three inputs, an impedance and an active high-frequency switch configured to vary the average value of the impedance by adjusting its duty cycle; each of the three inputs of the rectifier is connected to a phase of the at least one three-phase winding of the stator. Methods for operating a DFIG wind power facility during grid faults are also provided.

The application provides a non-continuous three-phase rectifier adjustable power decoupling method, and relates to the field of power electronics. The method is characterized in that a capacitor equivalent circuit is connected in parallel to the DC side of a three-phase PWM rectifier, the capacitor equivalent circuit is composed of a first capacitor connected in series with an active negative capacitor circuit, and a digital signal controller is used to sample the relevant voltage and current signals of the AC side and the DC side, and the active negative capacitor capacitance is adjusted by controlling the switching tube, so that the equivalent capacitor circuit can be flexibly adjusted. The application does not require an additional DC power supply, the capacitance and inductance of the passive device used are small, and the volume advantage is significant. The closed-loop control has high precision and equivalent inhibition effect as the traditional large capacitor. The equivalent capacitance is adjusted only by software, the external physical structure does not need to be changed, and the adjustment range is wide. The preset DC side voltage fluctuation amplitude can be calculated and adjusted automatically, different unbalanced working conditions can be adapted, the fluctuation suppression demand can be met, different working modes can be switched according to the AC side working condition, and the application is not continuously operated, so that the switching loss is lower.

The application discloses a parallel power supply current estimation method based on an instantaneous power integration method and relates to the technical field of power electronics and power supply control. The method collects electrical signals on the AC side of a three-phase PWM rectifier in front of each power supply module, calculates the instantaneous power input of the module, and integrates the input power and the voltage on the load side with the switching period of a DC-DC converter in back as an integration window to obtain the single-period energy and voltage integration value, so as to weaken the influence of the energy of energy storage elements such as inductors and capacitors in the circuit on the estimation result, thereby obtaining the preliminary estimation value of the output current of the module. Meanwhile, an independent equivalent loss resistor is introduced for each power supply module to describe the loss in the power supply, and the equivalent loss resistor is estimated in a longer time scale through an offline polling mode, so as to obtain the output current estimation result of each parallel power supply module.

The application discloses a kind of three-phase rectifier multiple switch tube open-circuit fault diagnosis methods based on voltage deviation, belong to power electronic converter fault diagnosis technical field.Method includes: obtaining relevant signal for diagnosis;According to three-phase voltage, three-phase current, three-phase inductance value, three-phase equivalent resistance value and switching period, the actual value of three-phase line voltage is calculated;According to DC voltage and the duty cycle of switch tube on three-phase bridge arm, the expected value of three-phase line voltage is calculated;Difference is obtained between the expected value and actual value of three-phase line voltage;The deviation value of three-phase line voltage is compared with first preset threshold and second preset threshold, to determine the polarity of the deviation value of three-phase line voltage;Wherein, first preset threshold is less than second preset threshold;The polarity of the deviation value of three-phase line voltage is combined with voltage phase, to determine fault switch tube.The application can quickly diagnose for various situations of multiple switch tube fault, including single switch fault, two switch tubes in succession fault, two switch tubes simultaneous fault.

The invention discloses a three-phase voltage type PWM rectifier switch tube open-circuit fault diagnosis method, which comprises the steps of 1, implementing three-layer wavelet decomposition on an input side three-phase current historical database after a three-phase voltage type PWM rectifier power switch tube open-circuit fault by adopting a wavelet decomposition method, extracting a characteristic value corresponding to the switch tube fault and finishing normalization; and 2, performing parameter optimization on the support vector machine through an improved mouse group search algorithm, and determining an optimal penalty factor and a kernel parameter so as to carry out data training and fault diagnosis. The invention aims to analyze the waveform distortion condition of the three-phase current at the input side after the open-circuit fault of the three-phase rectifier switch tube, so as to optimize the fault characteristic quantity and realize the accurate diagnosis of the open-circuit fault of the power switch tube. According to the invention, the fault identification capability of the rectifier system under the abnormal working condition can be effectively improved, so that safe and stable operation of power electronic equipment is ensured.

The application provides a kind of hybrid vector variable frequency control method based on three-phase rectifier, it is related to power electronic electric energy conversion technical field;Current three-phase PWM rectification technology is important front-stage equipment, and the current of switch tube is large, and the loss of switch tube is composed of turn-on loss and conduction loss, and conduction loss cannot be avoided in high-power state, and switch loss is related to frequency, if switch tube loss is not controlled, switch tube loss will accumulate in the form of heat, when temperature exceeds the limit of switch tube, it often causes irreversible damage to switch tube, therefore, on the basis of considering the power quality of DC side, the action frequency of switch tube of three-phase PWM rectifier is dynamically controlled to realize the continuous operation of three-phase PWM system under high power, and the method considers the stability of DC side voltage and the temperature characteristics of IGBT to carry out frequency modulation.

The invention relates to the technical field of power systems, and provides a negative sequence and reactive power comprehensive compensation treatment system and method.The system comprises a three-phase step-down transformer, a single-phase transformer, a single-phase transformer, a three-phase rectifier, a single-phase inverter and a single-phase inverter; the three-phase step-down transformer is a three-phase double-winding step-down transformer; the single-phase transformer is a single-phase double-winding boosting transformer; the single-phase transformer is a single-phase double-winding boosting transformer; the three-phase rectifier is composed of a connection reactor, a DC support capacitor, a DC bus and a three-phase voltage source converter. The single-phase inverter is composed of a direct-current supporting capacitor, a direct-current bus and a single-phase voltage source converter composed of four sets of turn-off devices. The single-phase inverter is composed of a direct-current supporting capacitor, a direct-current bus and a single-phase voltage source converter composed of four sets of turn-off devices. The method can adapt to various locomotive load combinations of the two power supply arms of the traction station, and the negative sequence of the wire inlet side of the traction station can be effectively treated under various working conditions.

This invention relates to a method for suppressing DC voltage ripple in a high-gain proportional resonant PWM rectifier, belonging to the field of rectifier control technology in power electronics. In existing technologies, when the three-phase voltage and current sampling of a three-phase PWM rectifier is inaccurate, the secondary ripple in the DC bus voltage and the harmonics of the grid-side current cannot be effectively suppressed. The method proposed in this invention establishes a transfer function between the negative-sequence current and the secondary ripple of the DC voltage based on the power conservation relationship between the AC and DC sides. It adjusts the negative-sequence current through negative feedback of the secondary ripple of the DC voltage to achieve voltage ripple suppression. Using the method described in this invention, rapid and accurate suppression of the secondary ripple of the DC voltage and the harmonics of the grid-side current can be achieved, avoiding reliance on mathematical models and complex calculations. It is not affected by sampling errors and inaccurate system parameters, and exhibits better robustness to system parameters and sampling accuracy.

The application particularly relates to a control method and system of a three-phase rectifier, and belongs to the technical field of power electronic rectifier control. The application determines the maximum amplitude phase voltage of three-phase voltage amplitudes by acquiring the three-phase voltage input of the three-phase rectifier, reconstructs the voltage into two-phase voltage with the same maximum amplitude phase voltage and keeps the phase unchanged under the shaft, converts the reconstructed two-phase voltage under the shaft into three-phase reconstructed voltage, balances and adjusts the three-phase reference current on the alternating current side based on the reconstructed three-phase voltage, obtains the approximately balanced three-phase reference current, improves the voltage imbalance state, carries out current loop control to determine the control signal of the three-phase rectifier and control the three-phase rectifier, makes the direct current side stably output the expected voltage under the input unbalanced phase voltage working condition, and improves the performance and stability of the three-phase rectifier.

Embodiments of the present application provide a modulation wave generation method, device, system, equipment, medium and product. The method comprises: receiving an intermediate voltage under three phases output by a three-phase rectifier; if the input source is a three-phase four-wire system, taking the intermediate voltage under each phase as the modulation wave of the phase; if the input source is a three-phase three-wire system, determining a harmonic component according to the intermediate voltage under three phases, and determining the modulation wave of the phase based on the harmonic component and the intermediate voltage under each phase. When the three-phase four-wire system input source is converted, the sinusoidal pulse width modulation can be directly based on the intermediate voltage under each phase. When the three-phase three-wire system input source is converted, the modulation wave equivalent to the space vector pulse width modulation can be obtained after the harmonic component injection on the intermediate voltage under each phase, and the pulse width modulation can also be realized, thereby improving the compatibility of the rectifier.

The utility model relates to the technical field of rectifiers, in particular to a three-phase rectifier with low ripple waves and a wide output voltage range. The utility model discloses a three-phase rectifier based on low ripple and a wide output voltage range. The three-phase rectifier comprises an AC voltage source module, a Y-type rectification module, an interleaved Boost module, an MOSFET control module, a Boost control module and a load. The DC / DC converter has the characteristics of low ripple and wide output voltage range output, and is very wide in application prospect. Compared with the traditional rectifier, the Y-shaped rectifier structure is adopted, and wide-range voltage output is obtained, so that the rectifier has better performance in the field of electric automobiles, the rectifier can be compatible with voltage levels of various nominal batteries, meanwhile, ripples of output current are reduced through interleaving Boost modules in parallel, and the output current is more stable. And the output waveform is smoother, the ripple is smaller, and the device is safer, more stable and more practical and has a very wide application prospect.

Disclosed in the present invention is a single-phase and three-phase compatible onboard charger, comprising an AC power supply input end, an EMC filter device, a three-phase rectifier, a controller, a first switch K 1 connected in series between the EMC filter device and an AC power supply, and a second switch K 2 connected in series between the EMC filter device and the three-phase rectifier. The present invention controls the opening and closing of the two switches, thereby achieving the single-phase and three-phase compatible operation. In addition, a unified filter circuit is used during the single-phase and three-phase operation, thereby reducing the number of filter devices and the number of switching devices, and further reducing the size and cost of a system. In the present invention, the working principle of a circuit is simple, the cost of controlling the system is low, and the single-phase and three-phase compatible operation is achieved simply by means of switching of relay switches; moreover, the design of an input filter is simplified, and the same filter device is used during the single-phase and three-phase operation, without adding an additional component, thereby reducing the cost and size of the system.

The invention discloses an inter-line power flow transfer topology and method considering photovoltaic output, and the topology comprises two three-phase rectifiers, a common DC bus, two distributed photovoltaics and three three-phase inverters, the two rectifiers are respectively connected with two low-voltage AC feeder lines in parallel, and are used as the input ends of a first transfer path; the two inverters which are respectively connected in series with the two low-voltage alternating-current feeder lines through the series transformers are used as the output end of the first transfer path, the inverter which is connected in series between the two low-voltage alternating-current feeder lines is used as the channel of the second transfer path, and the two distributed photovoltaics cooperate with the two alternating-current power supplies to provide output for power flow transfer and line loads. According to the invention, five three-phase current converters are used and a direct current bus is reserved, so that the power flow direction and the transfer power can be controlled through the current converters.

This invention discloses a control method for a Vienna rectifier topology based on SiC power devices. First, a mathematical model of a three-phase Vienna rectifier is established; then, the expressions for the Vienna rectifier's midpoint voltage and current are derived; an inner current loop is designed; an outer voltage loop is designed; and finally, midpoint potential balance control is performed. This invention can reduce the size of the Vienna rectifier system, improve the power factor, and reduce system losses.

The invention discloses a parallel power supply current estimation method based on an instantaneous power integration method, and relates to the technical field of power electronics and power supply control. According to the method, electric signals of the alternating current side of a preceding-stage three-phase PWM rectifier of each power module are collected, module input instantaneous power is calculated, integration is carried out on the input power and load side voltage by taking the switching period of a backward-stage DC-DC converter as an integration window, and single-period energy and a voltage integration value are obtained; the influence of energy round-trip of energy storage elements such as an inductor and a capacitor in the circuit on an estimation result is weakened, so that a preliminary estimation value of module output current is obtained; meanwhile, an independent equivalent loss resistor is introduced for each power supply module to describe loss in the power supply, setting is carried out in an off-line polling mode, and the equivalent loss resistor is estimated in a longer time scale by an integration method, so that an output current estimation result of each parallel power supply module is obtained.

The invention discloses a PWM rectifier fixed frequency prediction control method and system under three-phase imbalance, and relates to the technical field of power electronic control, and the method comprises the steps: building a three-phase PWM rectifier current prediction model under the three-phase imbalance state; predicting the active power of the next control period and the dynamic change of the d-axis positive-negative sequence current and the q-axis positive-negative sequence current based on the prediction model; based on the dynamic change, constructing a combined value function containing d-axis and q-axis positive and negative sequence current errors and active power errors, and obtaining an optimal modulation action time distribution strategy by minimizing the combined value function; generating a control signal according to an optimization result by adopting a space vector pulse width modulation technology; according to the method, independent adjustment of positive and negative sequence current is effectively realized by comprehensively considering a value function which takes d and q axis positive and negative sequence current errors and active power errors as targets under the condition of three-phase power grid voltage imbalance, and high-precision tracking and optimal scheduling of the active power of the system are ensured.

A compatible boost and step-down control three-phase PFC rectifier circuit and control method, the circuit includes input filter circuit, power switch circuit, output filter circuit and control circuit, through the implementation of the application, the bridge arm reverse connection MOS replaces the conventional rectifier bridge arm single MOS, the filter inductance is added to the input and output end of the rectifier, so that the circuit has lower starting current and reliable short circuit current suppression capacity; combined with the new control method, the problem that the three-phase PFC rectifier can only be boost control or step-down control in the prior art is solved, so that the rectifier can realize a wider input voltage range, realize high power power factor quality of the power supply; when the bridge arm MOS is turned off, the input and output are isolated, there is no current path, when the upper and lower bridge arms of the same phase are directly connected, the rectifier will not be damaged, has lower starting current and reliable short circuit current suppression capacity.

The invention, which belongs to the technical field of the power supply, discloses a portable isolation test power supply comprising an input protection module, a VFD module, a filter F1, an AC contactor K1, a boosting transformer T1, a three-phase electric detection module, a 24V switching power supply, a voltage-stabilized power supply module, a three-phase rectifier, a high-voltage DC-DC module, a DC output detection module, a driver, an intermediate relay and a main controller. According to the multi-path high-voltage adjustable alternating-current output system, the technical problems of independently monitoring each path of voltage and improving the measurement safety and reliability in the multi-path high-voltage adjustable alternating-current output system are solved, independent sampling, independent processing and non-interference of multi-path output are realized, the system reliability and the fault localization are remarkably improved, reliable electrical isolation of a high-voltage side and a control side is realized, and the reliability of the system is improved. Measurement precision and personal and equipment safety are guaranteed, the intelligent level of the system is improved, the system is suitable for a high-voltage adjustable alternating current output scene, and long-term stable monitoring of the high-voltage state is achieved.

The application discloses a variable gain double-loop control method of a three-phase PFC rectifier in discontinuous conduction mode, and relates to the technical field of power supply systems. The method comprises the following steps: firstly, determining an input-output variable ratio according to an input voltage, and calculating a proportional coefficient initial value under a load resistance based on a system cutoff frequency, and combining the variable ratio to determine a minimum load resistance and a corresponding integral coefficient; secondly, calculating a competitive gain coefficient through a DC side inductor and the variable ratio; then, fusing the gain coefficient, the initial value proportional coefficient and a traditional double-loop proportional coefficient to obtain a target proportional coefficient; combining a steady-state inductor current, the variable ratio and the integral coefficient to determine a target integral coefficient. Finally, the target PI parameter is used for a voltage loop, and the output thereof is multiplied by the competitive gain coefficient, and then, a minimum value is taken with a current loop output to generate a final control signal of the rectifier. The method improves the transient and steady-state performance of the three-phase PFC rectifier in discontinuous conduction mode under a wide range of variable load working conditions.

The invention relates to a control device (12) for a three-phase rectifier (10) connected to each phase (28) of an AC power grid (8) and to a neutral point (30), the control device being configured, within at least one current switching interval:-at a current acquisition time belonging to the current switching interval,-at a current acquisition time belonging to the current switching interval,-at a current acquisition time belonging to the current switching interval; simultaneously acquiring a value of the current flowing between each phase (28) and the rectifier (10), the current acquisition time being a function of a reference acquisition time associated with the current switching interval and a current hysteresis dependent on the value of the current acquired during at least one previous switching interval; and-calculating a value of a control signal for controlling the rectifier within at least one switching interval following the current switching interval as a function of the value of the current collected at the current switching interval.

The invention provides a nonlinear control method and system suitable for an airborne voltage type three-phase rectifier. The method and system mainly improve the dynamic adjustment performance of a backstepping control algorithm. The method comprises the following steps: performing abc-dq conversion according to an alternating-current side phase voltage and an alternating-current side line current to obtain a current direct-axis component, a current quadrature-axis component, a voltage direct-axis component and a voltage quadrature-axis component, and constructing an average state space model; converting the average state space model into a differential equation, calculating a state variable of total energy stored in the system and a state variable of input power of the system so as to construct a disturbance observer and a backstepping controller, and finally obtaining a duty ratio direct-axis component and a duty ratio quadrature-axis component; after the disturbance observation technology is adopted, when interference is added, the convergence speed of the output voltage is higher, overshoot is smaller, the transient response is higher, and the dynamic regulation performance is higher.

A charging module and a charging device. The charging module includes a three-phase rectifier module, a bus capacitor module, an inductor, and a controller. An input end of the three-phase rectifier module is electrically connected to an input power supply, and an output end of the three-phase rectifier module is electrically connected to an input end of the bus capacitor module. The bus capacitor module includes a first bus capacitor and a second bus capacitor. The first bus capacitor is connected between a first output end of a three-phase bridge arm and a midpoint of the three-phase bridge arm, and the second bus capacitor is electrically connected between a second output end of the three-phase bridge arm and the midpoint. The inductor is electrically connected to the midpoint of the three-phase bridge arm and a midpoint between the first bus capacitor and the second bus capacitor.

The utility model relates to the technical field of rectifiers, in particular to a three-phase PWM (Pulse Width Modulation) rectifier, which comprises a substrate, a shell arranged at the top of the substrate, a cooling plate arranged at the middle position of the substrate and positioned below the shell, and an S-shaped flow channel arranged inside the cooling plate, the bottom of the cooling plate is fixedly connected with two liquid inlet and outlet pipes communicated with the two ends of the flowing channel respectively, a plurality of fins arranged in order are fixedly installed on the two sides of the shell, an S-shaped spiral cooling pipe is inserted between the fins on the two sides of the shell in a penetrating mode, and the two ends of the cooling pipe penetrate through the base plate. The heat dissipation efficiency of the fins can be improved through cooling liquid flowing in the cooling pipes, heat in the shell can be rapidly taken away when the cooling liquid flows in the flowing channels in the cooling plates, and the heat dissipation efficiency of the fins can be improved through the cooperation of the cooling fan and the fins. Therefore, heat in the shell can be efficiently dissipated.

The present application relates to power supply system technical field, disclose a kind of perturbation compensation method of three-phase PFC rectifier under wide frequency input, comprising: establishing the single-phase DCDC model of equivalent three-phase PFC rectifier;The loss characteristics of inductance magnetic core in three-phase PFC rectifier under wide frequency input range is analyzed based on Bertotti model, to revise single-phase DCDC model;Adopt reduced order generalized integrator lock-in loop, determine the input frequency of three-phase PFC rectifier and the disturbance of input frequency are estimated;Using the small signal transfer function between the input frequency disturbance of three-phase PFC rectifier to direct current inductance current, design the feedforward controller opposite to its transfer characteristics;Build extended high-gain state observer, observe the centralized disturbance in system model by the parameter and nonlinear factor changed with input frequency, to design feedback controller, combine to compensate the disturbance of three-phase PFC rectifier.

The application discloses a high-speed superconducting maglev train damping system and a damping control method, which can be used in the technical field of vibration control of high-speed superconducting maglev trains. The system comprises a current collection coil, a superconducting coil and a suspension coil arranged on the train, the current collection coil is multiplexed as a damping coil for generating damping force while being used for supplying power to on-board equipment; a three-phase PWM rectifier is connected with the current collection coil and is used for adjusting the power factor angle of the current flowing through the current collection coil to control the size of the reactive current; the magnetic field generated by the current collection coil is coupled with the suspension coil to induce a current collection-suspension current in the suspension coil, the current collection-suspension current interacts with the magnetic field of the superconducting coil to generate a damping force acting on the train body; and a control system is connected with the three-phase PWM rectifier and is used for adjusting the output of the three-phase PWM rectifier in real time based on the vibration state of the train to dynamically control the damping force.

The utility model discloses an electrolytic capacitor-free motor controller with surge protection and an ECM motor, comprising an AC side surge protection circuit, a three-phase rectifier BG1, a DC side surge protection circuit, a thin film capacitor C0 and an inverter circuit, the DC side surge protection circuit comprises an inductor L2, a piezoresistor VAR7 and a discharge tube TSS1, a direct-current output end P of the three-phase rectifier BG1 is connected with one end of the inductor L2, the other end of the inductor L2 is connected with one end of the thin-film capacitor C0, the other end of the thin-film capacitor C0 is connected with the ground GND, the piezoresistor VAR7 and the discharge tube TSS1 are connected in series, and then the two ends of the piezoresistor VAR7 and the two ends of the discharge tube TSS1 are connected with the direct-current output end P of the three-phase rectifier BG1 and the ground GND respectively. Pulse current in surge can be effectively absorbed, and EMI parameters are improved; and product reliability is good.

The invention discloses a PWM rectifier power-grid-voltage-free control method based on a linear extended state observer. Firstly, aiming at the problems of direct-current bias, slow dynamic response, phase deviation and the like in a VF estimator, the invention provides a novel three-phase PWM rectifier control method without an alternating-current voltage sensor. According to the method, simple, rapid and accurate power grid voltage estimation is realized, a virtual resistor starting method is provided for the problem of overlarge starting impact current, and the starting current is inhibited to a certain extent. The provided estimation method is compared with a VF estimator, and the comparison result shows that LESO has higher convergence speed and better precision. According to the invention, the rapid and accurate estimation of the grid-side voltage is realized, and the starting impact current of the three-phase PWM rectifier is obviously inhibited.

The present invention provides a single-vector temperature control variable-frequency control method based on a three-phase PWM rectifier, which relates to the technical field of power electronic power conversion; first, for the three-phase PWM rectifier, an objective function for IGBT and power quality is established by using the relationship between the AC-side voltages of the three-phase PWM rectifier to select the switching state; by collecting the temperature of the IGBT, a mathematical relationship is constructed to change the switching frequency of the IGBT, thereby reducing the heat generation of the IGBT to avoid damage to the IGBT; the present invention establishes an objective function for IGBT and power quality to comprehensively select the switching state, and also takes into account the stability of the DC-side voltage and the temperature characteristics of the IGBT to perform variable-frequency modulation on the driving frequency.

The application provides a wave energy power generation hydraulic PTO constant-speed constant-pressure control system based on double-parameter joint debugging, which comprises a pressure transmitter, a rotating speed and torque instrument, a three-phase PWM rectifier, a generator vector controller, an oil pressure open-loop regulation module, an oil pressure closed-loop regulation module, a displacement regulation electric drive module, and an open-closed loop mode switching switch. m The open-closed loop mode switching switch is used for switching between the oil pressure open-loop regulation and the oil pressure closed-loop regulation and sending a fractional displacement signal x to the displacement regulation electric drive module. The application can realize decoupling control of rotating speed and system oil pressure under actual irregular wave sea conditions, truly realizes constant-speed and constant-pressure control effect, realizes stable system oil pressure control through oil pressure open-loop control and oil pressure closed-loop control, and the two forms can be configured singly or entirely according to actual user demand, wherein the open-loop control structure is simple, does not need system oil pressure signal feedback, meets basic demand, and the closed-loop control structure has better control effect.