566 results about "Constant power" patented technology

The invention relates to the technical field of ship propulsion power generation system control, in particular to a constant-power rotating speed control method and system for a ship shaft generator, and the method comprises the following steps: obtaining operation state parameters and ship environment parameters of a ship propulsion power generation system; based on the operation state parameters and the ship environment parameters, the influence of the adjusting action of the shaft generator on the rotating speed of a main propulsion diesel engine and the influence of the adjusting action of a main propulsion diesel engine speed adjusting device on the output power of the shaft generator are pre-judged, and an interactive pre-judgment result is obtained; according to the interactive pre-judgment result, jointly deciding and generating a first adjusting instruction for adjusting an axle generator and a second adjusting instruction for adjusting a main propulsion diesel engine speed adjusting device; by introducing an interactive pre-judgment and joint decision-making mechanism, the negative interaction between the shaft generator and the main propulsion diesel engine speed regulation device can be effectively identified and eliminated, and the operation stability and safety of the ship under the severe sea condition are improved.

The invention discloses a short-circuit current limiting and short-circuit recovery transient voltage control device and method for an aviation three-stage power generation system, and the device comprises a three-stage power generator, a power generator controller, a current sensor, a voltage and current collection module, and an asymmetric half-bridge excitation control circuit. Collecting the output current iL and voltage UL of the generator through a digital processor of the generator controller; when short circuit occurs, the given voltage USet of the voltage regulating loop is linearly reduced in a piecewise mode according to the relation between the iL and a preset threshold value, so that the generator works in a constant power interval; and when the short circuit is recovered, closing the upper / lower power tubes of the asymmetric half-bridge excitation control circuit according to the relationship between UL and a preset threshold value in a grading manner, and triggering a negative-pressure follow-current mode of a main excitation winding of the generator controller to quickly extinguish the field. The method can adapt to different generators without adjusting hardware circuit parameters, has no motor ablation risk during short circuit, has transient voltage less than 350V after short circuit recovery, has no power supply interruption in the whole process, has response delay less than 1ms, and greatly improves the safety and robustness of an aviation power supply and distribution system.

The invention discloses a magnetic adjusting assembly, a motor, an electric drive system and a vehicle, and the magnetic adjusting assembly comprises a magnetic conductive part which is suitable for being movably disposed on one side of a rotor in the radial direction, so as to adjust the magnetic flux passing through the rotor. According to the magnetic adjusting assembly, the magnetic flux passing through the rotor is adjusted to change the magnetic flux of the magnetic flux short-circuit loop formed by the magnetic conductive piece and the rotor, so that the adjustment of the magnetic flux of the main magnetic field is realized, the adjustment is convenient, and the motor applying the magnetic adjusting assembly has the advantages of a constant torque area and a constant power area; and a constant-power operation region and a high-efficiency region are effectively widened while high torque density and power density are ensured.

The invention discloses a converter grid following-grid construction control mode smooth switching method suitable for wide-range source-grid state change. The method comprises the following steps: constructing a phase-locked loop control loop, a power outer loop control loop and a current inner loop control loop of a grid following type converter based on constant power control; constructing a voltage control loop, a phase control loop and a voltage and current double-closed-loop control loop of the network construction type converter based on the virtual synchronous generator VSG; calculating real-time output active power P and reactive power Q of the converter; constructing a voltage phase synchronization loop switching control loop and a current instruction tracking loop, and realizing smooth switching of dq-axis current instruction values output by a power outer loop of a following network type and a voltage outer loop of a construction network type; and the output dq-axis current instruction value is transmitted to a current inner loop to generate a final voltage signal, and a PWM wave is output to the converter through a modulation link. According to the method, a voltage phase synchronous switching compensation mechanism is adopted, a voltage amplitude and a phase signal are synchronously corrected in the mode switching process, and smooth change of an inner ring current reference signal is achieved.

The invention provides a constant-power driving method of a light source, a light source driver and an air conditioning system, and the constant-power driving method comprises the steps: determining an equivalent voltage corresponding to the power of the current light source based on the working current and working voltage of the current light source obtained in real time; performing differential amplification processing on the equivalent voltage and the expected voltage to generate a constant power modulation instruction of the light source; the expected voltage is a constant voltage simulated according to the rated power of the light source; driving power of the light source is generated based on a constant power modulation instruction of the light source and a feedback adjustment instruction, the driving power is amplified by using a preset power amplification coefficient, the amplified driving power is used for driving the light source to emit light, and the feedback adjustment instruction is generated based on sampling feedback of the driving power of the amplified light source. The constant-power driving of the light source is adopted, so that the service life, the precision and the response speed of the light source are ensured.

A DC electronic load circuit relates to the technical field of electronic load control. The utility model provides a direct current electronic load circuit which integrates a dissipation MOS tube array, an analog PID loop, a digital integrated control module, a bus electrical parameter sampling and processing module and a WiFi communication module, and realizes a plurality of working modes such as constant current, constant voltage, constant resistance and constant power by accurately controlling the conduction degree of the MOS tube array. The system has the advantages of real-time monitoring, remote control, overvoltage and overcurrent protection, low power consumption design and the like, and an electronic load solution which is high in precision, high in stability and flexible to operate is provided, so that diversified test requirements are met, and the power supply test efficiency and safety are improved.

The invention relates to the technical field of grinding control, in particular to a constant-power grinding control method, system and equipment of a numerical control grinding machine. According to the method, in a preset historical time period of a to-be-regulated moment, a time sequence curve of the deviation of the grinding power of the numerical control grinding machine relative to the preset grinding power is obtained and subjected to time sequence decomposition, and then proportional gain in PID control parameters is obtained according to the change trend of a trend component and the power deviation at the to-be-regulated moment in the trend component; obtaining an integral gain in the PID control parameters according to the periodic fluctuation characteristics of the seasonal components; according to the change trend of the time sequence curve and the fluctuation characteristics of the residual component, and in combination with the proportional gain and the integral gain, obtaining the differential gain in the PID control parameters; and finally carrying out constant-power grinding control on the numerical control grinding machine. The PID control parameters are adaptively adjusted based on the time sequence decomposition result of the power deviation, and the constant power control effect on the numerical control grinding machine is improved.

The invention discloses an MPC-SP-based all-vanadium redox flow battery constant-power charging and discharging control method, which is applied to an energy storage control system composed of an MPC-SP controller, a PCS and an all-vanadium redox flow battery, and is characterized in that the controller dynamically and accurately adjusts the power output to the battery based on preset SOC interval division, and the power output to the battery is increased along with the increase of the actual SOC value of the battery. The power is increased in stages. Meanwhile, the controller pays attention to the voltage Ud of the battery end all the time, and when the Ud reaches a voltage limiting value, the constant voltage mode is switched, so that the battery is effectively prevented from being damaged due to overhigh voltage. The state-based dynamic power management is much safer, more flexible and more intelligent than traditional fixed constant power control. According to the invention, the change rate of current in the charge-discharge process of the all-vanadium redox flow battery can be reduced, the service life of the battery is prolonged, and the safety is guaranteed.

The invention discloses a virtual impedance compensation-based active-disturbance-rejection control method for a dual-active-bridge converter, and the method comprises the following steps: firstly designing a virtual impedance compensation strategy, connecting an equivalent virtual conductor in parallel with an output capacitor, converting the equivalent virtual conductor into a duty ratio injection amount, and achieving the active counteracting of the negative impedance of a constant-power load and the reconstruction of the damping of a port; an unstable pole of the right half plane is made to move back to the left half plane, and extra power loss is not introduced; an active disturbance rejection control strategy based on virtual impedance compensation is designed, residual uncertainty after virtual impedance compensation is uniformly regarded as total disturbance online observation and feedforward offset, and therefore rapid and smooth voltage tracking is kept under parameter perturbation and external disturbance. Under the working conditions of voltage reference step and load abrupt change, the improved active disturbance rejection control strategy realizes the effects of no overshoot, shortest setting time and minimum oscillation by enhancing disturbance observation and virtual impedance compensation, and has better damping and disturbance rejection performance.

The invention relates to the technical field of micro-grids, and discloses a control method of a distributed power supply in a plant micro-grid, and the method comprises the steps: S1, constructing a multi-source collaborative micro-grid system; s2, executing real-time power dynamic allocation; s3, working condition power balance control; s4, active regulation of bidirectional power flow and the like. Based on a real-time AGC instruction and plant load data, a hierarchical coordination mechanism is adopted, charging and discharging power is dynamically adjusted by means of stored energy to track the AGC instruction, and constant power output of wind power is maintained in combination with a wind power prediction model; when a thermal power generating unit is subjected to deep peak regulation, shutdown or fault, the system absorbs excess wind power through energy storage charging, synergistically improves the hydrogen production load power, guarantees dynamic matching of the load and power generation, and actively adjusts energy storage charging and discharging and hydrogen production loads by monitoring the power flow directions of a thermal power generating unit section and a desulfurization section in real time according to voltage fluctuation caused by bidirectional power flow. And the voltage deviation is dynamically compensated, and the system voltage stability is greatly improved.

The invention provides a load tracking control method for an energy storage system in an oil field scene, which realizes cooperative control of constant-power operation of a generator and rapid compensation of energy storage. The system comprises the following mechanisms: a diesel generator; the energy storage system comprises an energy storage converter PCS and an energy storage battery pack; the AI sampling module is used for respectively sampling implementation voltage and current data of the diesel generator and the load through a voltage transformer PT and a current transformer CT; the EMS system side power calculation module comprises an energy management system power calculation module and a power conversion system; and an oil field load; an output end of a diesel generator and an output end of an energy storage converter PCS are converged to a load output line and then are connected to an oil field load, an AI sampling module also samples voltage and current data of the load output line, the diesel generator and an energy storage system supply power to the oil field load at the same time, and an engine operates in a high-efficiency interval. And the energy storage system bears instantaneous power fluctuation.

The invention discloses a grid-connected inverter power and current coordination control method under a harmonic power grid and a related device, and relates to the technical field of renewable energy power generation, and the method comprises the steps: obtaining a two-phase power grid AC voltage based on a three-phase power grid AC voltage; calculating a reference current under a direct power control strategy based on the active power reference value, the reactive power reference value and the two-phase power grid AC voltage; harmonic waves in the reference current under the direct power control strategy are filtered out, and a fundamental component and a harmonic component are obtained; based on a preset adjustment coefficient, the fundamental component and the harmonic component, obtaining a reference current with an adjustable harmonic content; performing zero static error control on the reference current with the adjustable harmonic content to obtain a modulation voltage; and performing sine pulse width modulation on the modulation voltage to obtain a grid-connected current. According to the invention, coordinated control of power constancy and current balance of the grid-connected inverter can be realized.

The invention relates to the field of UHPC stirring machine control, in particular to a constant-power automatic speed regulation control system and method for UHPC stirring, the operation process of a UHPC stirring machine is divided into a plurality of process stages, each stage corresponds to different frequencies, rotating speeds and operation time, accurate control over the rotating speeds is achieved, and on the premise that the power is constant, the speed regulation speed of the UHPC stirring machine can be accurately controlled. The rotating speed is flexibly adjusted to meet the requirements of different stirring stages of UHPC, the mixing quality is guaranteed, efficient utilization of energy is achieved, a constant-speed stirring machine is changed into a variable-speed intelligent stirring machine through multi-section speed control of the frequency converter, energy is saved by 30% or above, and the quality and productivity of UHPC products are remarkably improved through process-level rotating speed matching.

The present application relates to an automatic temperature-controlled air disturbance constant-power charging energy storage system for aqueous liquid-rich batteries, the system comprising: an air disturbance unit for delivering gas to the interior of the battery, the air disturbance unit comprising an air duct, the air duct being vertically inserted into the battery and having a plurality of air holes on its surface for injecting gas into the electrolyte of the battery in the form of bubbles, a temperature regulating unit for regulating the temperature of the gas input to the battery by the air disturbance unit, a collection module for collecting the electrical parameters and temperature parameters of the battery, a control unit for controlling the start and stop of the air disturbance unit, as well as the gas pressure and gas flow rate input to the battery according to the electrical parameters, and controlling the temperature regulating unit according to the temperature parameters. Through the present application, the problems of low charging efficiency and short service life of aqueous liquid-rich batteries are solved. By controlling the temperature of the input gas, the battery temperature is kept within an appropriate range, thereby improving the charging efficiency of the battery, and the air disturbance unit is used to avoid electrolyte stratification, thereby extending the service life of the battery.

The invention relates to a doubly-fed variable-speed pumped storage unit comprehensive inertia supporting method, device and equipment based on an excitation capacitor. The method comprises the following steps: acquiring a frequency deviation value and a frequency deviation change rate of a grid-connected point after a load connected with a power system is suddenly changed; determining whether to start a comprehensive inertia control strategy according to the frequency deviation value and the frequency deviation change rate; if the comprehensive inertia control strategy is started, dynamically adjusting a DC bus voltage reference value according to the frequency deviation value to determine a d-axis modulation voltage component; acquiring additional electromagnetic increment power; controlling a grid-side converter in the power system to operate according to the d-axis modulation voltage component, controlling a machine-side converter in the power system to operate according to the additional electromagnetic increment power, and providing inertial current impact support for the power system; and if the comprehensive inertia control strategy is not started, the frequency of the power system is kept stable and synchronous, and the doubly-fed variable-speed pumped storage unit of the power system is controlled to work in a constant power state.

The invention relates to the technical field of lasers, and provides a double-gain-medium Q-switched laser and a constant-power pulse width adjusting method.The laser comprises a first pumping source, a second pumping source, an optical fiber beam combiner, a beam shaping system and a laser resonant cavity, the laser resonant cavity comprises a reflecting mirror, a first gain medium, a second gain medium, a polarization selector, a quarter-wave plate, a Q switch and an output mirror which are arranged in sequence; the first gain medium is used for absorbing first pumping light, the second gain medium is used for absorbing second pumping light, and the pumping power of the first pumping source and the pumping power of the second pumping source can be independently controlled. By changing the pumping power of the two pumping sources, real-time adjustment of the pulse width of the laser under the constant output power is achieved, the structure is compact, and control is easy and convenient.

The invention relates to the technical field of output control, in particular to a constant power control method, device and equipment based on COT and a storage medium, according to the method, fixed turn-on time is combined with dynamic turn-off time adjustment, the conciseness of COT control is reserved, accurate control over output power is achieved, and the control efficiency is improved. The influence of interference factors such as battery voltage drop and load abrupt change on constant power output can be effectively counteracted; specifically, a multi-path output synchronous opening design is adopted, and unified turn-off time adjustment logic is combined, namely, the turn-off time of a (k + 1) th period is calculated according to the total duration of a target period, so that an asynchronous turn-off condition caused by parameter differences of all channels is avoided, and the voltage rise deviation generated by load changes of a later turn-off channel is reduced; real-time output voltage and load resistance are respectively sampled in one period, battery voltage fluctuation and load change are monitored in real time, and error accumulation caused by the fact that a measured value in the current period is extended to the next period to be adjusted is avoided.

The invention discloses an electrosurgical radio frequency inverter based on model predictive control and a frequency conversion control method thereof, and the method comprises the steps: building a discrete output voltage prediction model based on a topological structure of the electrosurgical radio frequency inverter, and judging a switching frequency switching point and voltage peak output power through single sampling period iterative calculation. Constructing an output power prediction model; obtaining instantaneous prediction output power and theoretical reference output power obtained by real-time sampling and calculation when the output voltage is changed to a periodic peak value, and constructing a model prediction control evaluation function; according to the evaluation function, real-time voltage sampling and multi-frequency iteration prediction are combined with a set control target, the switching frequency of the radio frequency inverter is predicted and updated in real time, and constant-power frequency conversion control over the radio frequency inverter is achieved by continuously obtaining the control quantity at the next moment. The system can adapt to constant power output of a power supply under biological impedance change, can predict and control constant power output of an electrosurgical inverter in real time based on real-time updating of switching frequency, has good dynamic response performance, guarantees high efficiency and safety of clinical operations, and can be applied to various electrosurgical working platforms.

The invention provides a wireless charging system constant power output control method based on parameter sensitivity analysis, and the method comprises the steps: obtaining the transmitting-receiving end parameter information of a wireless charging system, and carrying out the exchange of the transmitting-receiving end parameter information; determining target output power according to the transmitting-receiving end parameter information; coupling coil mutual inductance is identified, a mutual inductance offset proportion and a switch tube conduction phase angle of the switch control capacitor are calculated, and a phase control capacitor switch duty ratio of the switch control capacitor is set; outputting the constant power of the wireless charging system according to the calculation and setting results; judging whether the output power meets the requirement or not; if yes, the setting and calculation processes are executed again at set time intervals, and whether the output power meets the requirement or not continues to be judged till current power output control is completed; and if the output power does not meet the requirement, directly resetting the setting and calculation process until the output power meets the requirement. According to the invention, constant power output of the system under a variable coupling coefficient condition is realized.

The invention discloses a wind power plant electromagnetic transient equivalence method and system oriented to power grid stability control strategy verification. The method comprises the steps that the rotating speed and wind speed correlation characteristics of electromagnetic transient models of all wind turbine generators in a wind power plant, the networking form of the wind turbine generators in the wind power plant and the operation working condition of all the wind turbine generators before a fault are obtained; all wind turbine generators in a wind power plant are divided into three initial groups including a starting area, an MPPT area and a constant-rotating-speed constant-power area; the grouping of the starting area and the constant rotating speed and constant power area is kept unchanged, the wind turbine generator in the MPPT area is further subdivided into three subgroups, and a wind power plant equivalent model containing five subgroups is formed; calculating the equivalent wind speed and multiplication value of the grouped wind turbine generator, and calculating the equivalent parameter of the current collection line of the wind power plant; performing multi-scene and multi-working-condition test verification on the established wind power plant equivalent model; according to the method, the transient response precision is improved while the simulation efficiency is ensured, and the contradiction problem of insufficient equivalent precision of a traditional single machine and large calculation amount of a detailed model is effectively solved.

The invention relates to the technical field of new energy and energy storage, and provides a renewable energy hydrogen production control system based on dynamic power matching and hydrogen storage collaboration, which comprises a power conversion system with a constant voltage mode and constant power mode millisecond switching capability; the modularized electrolytic cell array is formed by connecting a plurality of proton exchange membrane electrolytic cells in parallel; the hydrogen storage cooperation unit comprises a high-pressure hydrogen storage tank group, a solid oxide fuel cell and a hydrogen purification device; the intelligent control unit is used for executing a three-stage control strategy; the real-time control layer is used for executing proton exchange membrane electrolytic cell power instruction tracking and power grid frequency deviation compensation; the optimization scheduling layer adopts a reinforcement learning model prediction control algorithm to perform rolling optimization on the power distribution proportion of hydrogen production and power generation; and the planning layer is used for generating a proton exchange membrane electrolytic cell start-stop plan and a hydrogen storage scheduling plan in combination with meteorological prediction and electricity market transaction data. The problems that wind-solar power generation fluctuation is large, and a traditional hydrogen production system is slow in response and insufficient in economical efficiency can be solved.

The invention relates to the technical field of intelligent regulation and control of energy storage power stations, in particular to a peak regulation and frequency modulation cooperative control method for an energy storage power station. Comprising the steps of multi-source data acquisition and preprocessing, multi-model fusion prediction and error pre-judgment, rolling optimization and three-level linkage error correction, multi-time scale layered cooperative control based on SoC dynamic optimization, parameter adaptive comprehensive frequency modulation and hybrid energy storage execution. According to the method, a five-stage cascade fusion prediction framework is constructed, a dynamic weight fusion mechanism and a Cornish-Fisher series error pre-judgment model are combined, the problem of pain points of multi-scale prediction independent operation and error accumulation conduction in the prior art is solved, and through the rolling optimization characteristic of MPC model prediction control and a three-stage linkage error correction mechanism, the prediction accuracy is improved. And in cooperation with adaptive error compensation of DDPG reinforcement learning, the execution accuracy of a peak regulation and frequency modulation instruction is improved, the problem of load curve distortion caused by a traditional constant-power peak regulation mode is effectively avoided, and the stability of power grid operation is greatly improved.

To provide a charging control method.SOLUTION: A charging control method includes steps of: determining, as a first value, a charging completion voltage of constant current charging or constant power charging on the basis of a target charge energy of a battery; before the voltage value of the battery reaches the first value, determining whether or not a time point when the voltage value of the battery reaches the first value is predicted to be around a minimum point of the battery voltage increase rate during the constant current charging or constant power charging; and maintaining or changing the charging completion voltage in accordance with the determination result.SELECTED DRAWING: Figure 6

The application discloses a constant power control method and device of a wind energy conversion system based on non-Gaussian data and a medium, establishes a performance index based on second-order information potential, and obtains optimal control input by optimizing the established performance index through a Newton method, so that the output speed and output power of the wind energy conversion system under non-Gaussian wind speed interference can track the set value, constant power control of the wind energy conversion system is realized, the fluctuation of the output power is reduced, and the service life of the wind turbine is prolonged. The application performs controller design under the condition that the interference is a non-Gaussian random variable, compared with the existing method in which noise is ignored or noise is assumed to be subject to Gaussian distribution, the application is more general and practical. Moreover, the application considers the mutual relationship between two closed loop circuits in a multivariable system, adds joint information potential in the performance index, allows variable speed during a transient period, and can obtain higher control performance.

The invention discloses a method for determining a self-consuming power curve of a wind turbine generator, which comprises the following steps of: performing conversion according to an actually-measured wind speed and an actually-measured air density to obtain an equivalent wind speed under a standard air density, and segmenting the equivalent wind speed into various wind speed sections according to a standard power curve; self-consuming equipment is divided into constant-power equipment and variable-load equipment; working condition coefficients of all the constant-power devices and all the variable-load devices in the corresponding wind speed sections are determined; according to the rated power of each constant power device and each variable load device and the working condition coefficient of the corresponding wind speed section, respectively determining the self-consuming power of each wind speed section of each constant power device and each variable load device; summing the self-consumed power of the same wind speed section of all the constant power equipment and the self-consumed power of the same wind speed section of all the variable load equipment to obtain the self-consumed power of the whole machine in each wind speed section, and generating a wind speed section-self-consumed power curve. The actual operation condition is dynamically captured, and the accuracy and efficiency of generating capacity evaluation are improved.

The invention relates to a DC-DC converter control method based on an intelligent agent reinforcement learning algorithm, and the method comprises the steps: firstly building an intelligent agent for a DC-DC buck converter which supplies power to a constant-power load, obtaining a state observation quantity formed by all preset environment variable values of the DC-DC buck converter through the intelligent agent, and obtaining the state observation quantity of the DC-DC buck converter; and a reward value corresponding to a difference value between the output voltage and a preset reference voltage is processed by the intelligent agent, and a corresponding action signal is output and used for controlling the DC-DC buck converter. And then through reinforcement learning training of the intelligent agent, the trained model controls the DC-DC buck converter, so that the output voltage of the DC-DC buck converter has good adaptivity and dynamic response characteristics under different working conditions, and the designed intelligent agent has good steady-state performance in application, so that the stability of the DC-DC buck converter is improved. Model parameter uncertainty caused by component aging can be dealt with, and the stability in practical application is ensured.

This invention proposes a battery pack balancing control method for long-endurance drones, which can dynamically adjust the actual output power of each individual battery and the battery pack to achieve balanced discharge. The invention employs an autonomous balancing control unit and a constant output control unit. The autonomous balancing control unit dynamically adjusts the actual output power of each battery pack to achieve balanced discharge. This avoids the problem of excessive discharge of individual battery packs due to uneven discharge among multiple battery packs, which can lead to a rapid decrease in the overall battery capacity and effectively extend the drone's flight time. The constant output control unit ensures a constant power output from the drone's power system to meet the stable power supply requirements of the long-endurance drone's onboard electronics and power equipment.

The present invention relates to the field of wireless power transmission technology, and discloses a highly anti-offset wireless power transmission system with four reconstruction modes, comprising a reconfigurable inverter module, a primary-side compensation network module, a secondary-side compensation network module, and a rectifier filter circuit module; through the coordination of compensation topology reconstruction and parameter optimization design, constant power output within a coupling coefficient variation range of about 620% is achieved, and the secondary-side loop only uses a single capacitor series compensation. The system structure is more compact, simple, and lightweight, and is more in line with actual application requirements. It can achieve constant power output within a coupling coefficient variation range of about 620% at a fixed operating frequency and without the need for additional control hardware or complex mechanical adjustments, only through simple switch tube control.

Techniques are provided for automatically determining when voltage and current levels occur when a DC input of a radio is drawing substantially constant power through electrical conductors from a DC voltage converter. Such voltage and current level occurring when such power draw is substantially constant can then be used to determine a resistance of the electrical conductors. Subsequently, the resistance can be used to vary an output voltage of the DC voltage converter when the power draw, and thus the direct current drawn through the electrical conductors, varies.

This invention discloses an active damping control method for bipolar DC distribution systems based on modulus decomposition. It incorporates line coupling into the system's stability criteria and active damping parameter design, deriving the pole-mode transformation matrix of the metal-return bipolar DC distribution system and obtaining a decoupling model of the bipolar DC line in the modulus component space. The modulus models of the source-side converter and load are also derived. Based on the established decoupling model of the bipolar DC distribution system in the modulus component space, an active damping control method based on modulus decomposition is proposed. This invention considers the impact of DC distribution lines on stability, incorporating line coupling into the system's stability criteria and active damping parameter design. The modulus damping control scheme proposed in this invention can more effectively suppress instability caused by the negative impedance characteristics of constant power loads and also provides a basis for parameter adjustment.