185 results about "Active power control" patented technology

The invention discloses a system and a method for analyzing stability and oscillation transmission of a network-forming converter system, and belongs to the technical field of virtual synchronous generator control, and the system comprises an active power control loop which takes an active power deviation value as input, and outputs a power angle of a VSG system through an active integration part and a feedback part; the reactive power control loop takes the reactive power deviation ratio as input, and outputs the voltage amplitude of the VSG system through an active integration part and a feedback part; according to the analysis method, whether each state variable is stable or not is judged firstly, and then the intensity of oscillation transmission between the state variables is judged. According to the method, the stability of the system can be evaluated more accurately, and the accuracy of system stability analysis under dynamic disturbance is ensured; an oscillation transfer effect function is introduced, and the mutual influence between different state variables is quantitatively analyzed; and the dynamic fluctuation range of each state variable in the system can be accurately evaluated.

The invention discloses a photovoltaic power station multi-source inverter active power control method and system, and relates to the technical field of photovoltaic power station active power control, and the method comprises the steps: calculating the dynamic performance score of each inverter based on the response time, conversion efficiency and health degree data of a multi-source inverter of a target photovoltaic power station; dividing the multi-source inverter into a response group and a steady-state compensation group based on the dynamic performance score and the dynamic division threshold; based on a preset allocation proportion, allocating the scheduling power regulation quantity to the response group and the steady-state compensation group; monitoring the overall output power of the target photovoltaic power station in real time; if the overall output power does not reach the target power range within the preset time, the active power output proportion of the response group is adjusted based on the prediction model; and after the overall output power of the target photovoltaic power station reaches the target power range, starting steady-state power replacement. The technical problem that the prior art cannot adapt to real-time working condition changes is relieved.

The invention discloses a safety control method and system for an emerging control main body, and belongs to the technical field of power system active control, and the method comprises the steps: carrying out the bidirectional data interaction through a master station AGC and a field station AGC, and carrying out the bidirectional data interaction based on a bidirectional data interaction result and a cooperative anti-error parameter; whether the emerging control main body is in a controllable state or not is judged in real time through collaborative security locking logic; if the control main body is in the controllable state, active measurement data of the emerging control main body are obtained, and jump detection and multi-source checking are carried out on the active measurement data; after verification is passed, a pre-control instruction is generated based on the control strategy, and reasonability verification and control effect simulation verification are carried out; and after the control effect simulation verification is passed, the pre-control instruction is taken as a final control instruction to be issued to the emerging control main body for execution. The method can greatly improve the safety control capability of AGC on an emerging control main body, guarantees the frequency operation safety of a power grid, and improves the safe and reliable power supply capability of the power grid.

Disclosed in the present invention are a control method and system capable of providing frequency support for a flexible interconnected power distribution network. The method comprises: using a permanent-magnet direct-drive wind turbine connected to a flexible interconnected power distribution network to provide frequency support, measuring a direct-current voltage of a grid-side converter of the wind turbine, calculating a per-unit value and the phase of the direct-current voltage, and calculating the amplitude of a modulation voltage; generating a trigger pulse signal; monitoring the rotation speed of a wind turbine rotor and the rotor position angle of a synchronous generator, and acquiring a per-unit value of optimal power; calculating an active power reference value; on the basis of active power control and current control, outputting a d-axis component and a q-axis component of a modulation voltage of a generator-side converter, and by means of rotating coordinate transformation, generating a three-phase modulation voltage in a stationary coordinate system; and generating a trigger pulse signal by means of a pulse width modulation stage. The present invention enables wind turbines to provide quick response for power distribution networks in a frequency support stage, and prevent rotation speed stalling and suppress secondary frequency drop in a rotation speed recovery stage, thereby improving the support capability of the wind turbines for power grids.

The invention discloses a method for improving stability of a network-forming converter by considering voltage and phase transients, which solves the problem of over-current control blind areas existing at the initial stage of a fault and at the moment of clearing in a traditional single current limiting method and overcomes the defect that the stability is sharply deteriorated when a traditional strategy is used for coping with a composite fault. The method comprises the following steps: S1, obtaining a virtual synchronous machine swing equation under a synchronous rotating coordinate system and an equivalent circuit model under the action of a circular current limiter; and S2, obtaining a nonlinear relation between the output power and the power angle of the converter, and analyzing a transient stability domain of the converter during a fault period. And S3, obtaining a mixed current limiting strategy, deducing an equivalent circuit model corresponding to the strategy, and further obtaining an output power expression corresponding to the strategy. And S4, obtaining a power damping term acting on an active power control loop, further obtaining a synchronization stability improvement strategy, and deducing a closed-loop model describing the system at the moment.

The invention provides a VSG transient support capability improvement strategy based on active deviation integral feedback. The strategy comprises the following steps: constructing a VSG active control loop based on active power deviation integral feedback; based on the VSG active control loop, calculating an integral feedback compensation value based on power deviation control; and based on the integral feedback compensation value, the limit fault clearing time is prolonged. According to the strategy provided by the invention, the power angle change rate of the VSG can be effectively inhibited in the fault process, the limit fault clearing time is prolonged, and the transient power angle stability is improved.

The invention discloses a time sequence fault current-limiting control method and system compatible with a grid-connected guide rule for a network construction type doubly-fed wind turbine generator, and the method comprises the following steps: freezing external power control when a low-voltage ride-through event of a power grid is detected at the initial stage of a fault, and suppressing transient overcurrent through dynamically adjusting the resistance component of virtual impedance; in the fault stable stage, an electromotive force compensation increment is calculated on the basis of grid-connected guide rule requirements at the moment 4 tau after the fault occurs; in the fault clearing stage, after it is detected that the fault is cleared, electromotive force compensation is stopped; gradually recovering the virtual impedance to a rated value through the dynamic coefficient A; in the fault recovery stage, active control and reactive control are recovered in sequence, power output is recovered to the level before the fault within one second, and meanwhile the virtual impedance amplitude is gradually recovered to the rated value along with the voltage phase difference; the voltage phase jump amplitude and the voltage drop amplitude determined by the method have high robustness.

The invention relates to a virtual inertia-damping cooperative adaptive control method for a voltage source type direct-driven permanent magnet wind turbine generator. The method comprises the following steps: constructing a voltage source type direct-driven permanent magnet wind turbine grid-connected equivalent model; constructing a wind turbine generator frequency response model based on a dynamic coupling relationship between virtual inertia and virtual damping; collecting a frequency signal of a common connection point of a power grid, and carrying out collaborative optimization processing on the frequency signal by adopting a composite filter to obtain a virtual power increment; the active power reference value is introduced into an active power control loop of the grid-side converter; and controlling the power grid side converter after the additional power reference value is introduced by adopting a rotational inertia and damping coefficient adaptive control method based on a nonlinear function. According to the method, frequency steady-state deviation compensation and dynamic change rate correction can be realized, the frequency stability under wide-range disturbance can be improved through segmented nonlinear adjustment, and the requirements of unit active inertia response and power grid frequency stability are met.

The invention belongs to the technical field of power grid control, and relates to a transformer area flexible interconnection system three-phase imbalance control method and device and a medium. Taking the transformer area converter controlled by the PQ control algorithm as a target transformer area converter; collecting a first control parameter output by an active power PI controller of the target transformer area converter; based on the upper and lower limits of the voltage target value of the DC bus, performing amplitude limiting setting on the first control parameter of the target transformer area converter to obtain the voltage target value; subtracting the voltage target value from the actual voltage value of the direct-current bus, inputting the difference value into the PI controller, and outputting a second control parameter of the target transformer area converter; taking the second control parameter as a direct-axis current target value, subtracting the direct-axis current target value from a direct-axis current actual value, and taking the difference value as the input of a direct-axis current PI controller; and controlling the target transformer area converter based on the voltage modulation signal output by the PQ control framework. The scheme can effectively improve the power supply reliability of the power distribution area and stabilize the DC bus voltage.

The invention relates to the technical field of offshore wind power grid connection, in particular to a low-frequency oscillation suppression method for an offshore wind power synchronous machine grid connection system, which comprises the following steps: acquiring inherent parameters of the synchronous machine grid connection system and active power reference instructions of each fan of an offshore wind power plant; according to the inherent parameters, control parameters of a preset damping controller are determined, and the damping controller is configured based on the control parameters; acquiring an actual operation frequency signal of the offshore low-frequency power grid in real time, and comparing the actual operation frequency signal with a preset rated frequency of the offshore low-frequency power grid to obtain a frequency deviation signal; inputting the frequency deviation signal into a configured damping controller, and outputting a damping power instruction; and superposing the damping power instruction and the active power reference instruction to generate an active power control instruction. According to the invention, the low-frequency oscillation of the new energy synchronous machine grid-connected system can be effectively suppressed, and meanwhile, the situation that the grid-connected safety is threatened due to the great fluctuation of the terminal voltage of the motor caused by suppression measures is avoided.

The invention discloses a control method, device, equipment, medium and product of a network-forming type permanent magnet wind power system, and the method comprises the steps: calculating the maximum wind energy tracking power outputted by the network-forming type permanent magnet wind power system under the optimal wind energy tracking based on the maximum wind energy tracking coefficient; calculating a direct-current voltage damping control coefficient of a side damping controller according to the inertia coefficient and the damping coefficient of the direct-current voltage; calculating an electromagnetic power reference value output by the permanent magnet synchronous generator according to the maximum wind energy tracking power and the DC voltage damping control coefficient; and subtracting the electromagnetic power reference value from the electromagnetic power actual value, and inputting the difference value into a machine side active power controller so as to adjust the electromagnetic power output by the permanent magnet synchronous generator. According to the method, on the basis of not adding hardware equipment, the transient stability of the grid-forming type permanent magnet wind power system during the short-circuit fault period of the power grid can be remarkably improved only by changing the control strategy of the machine-side converter of the grid-forming type permanent magnet wind power system.

The invention provides a network construction converter control method, which comprises the following steps: decoupling an original transient damping coefficient and an original primary frequency modulation coefficient which are mutually coupled in an original VSG control system to obtain an active steady-state primary frequency modulation coefficient K [omega] and an active transient damping coefficient KD, and further respectively establishing active steady-state and transient independent regulation channels; active control steady-state deviation is realized through an active steady-state primary frequency modulation coefficient K [omega], response speed control is realized by combining a controller function Gdamp (s), active transient damping coefficient KD is adjusted to be combined with a second-order filter function GLPF (s) to control active low-frequency oscillation suppression, and independent control and adjustment of active steady state and transient state are realized. The adaptability of a network-forming converter control strategy to different power grid intensities, system inertias and load characteristics is further improved, and the problems that in an existing VSG control method, the control effect coupling of an original transient damping coefficient and an original primary frequency modulation coefficient is too high, and the requirement for independent adjustment of active power dynamic and steady-state characteristics cannot be met are solved.

The invention discloses an active power control method, system, equipment and storage medium for an energy storage system of a power grid side energy storage power station, and relates to the field of energy storage power stations. Data are collected and processed through multiple channels, and power instructions of PCS are obtained through dynamic priority calculation, comprehensive power instruction synthesis and SOC optimization distribution; and then issuing through a GOOSE protocol and performing closed-loop correction according to feedback deviation of + / -2% dead zones, thereby realizing accurate regulation and control of active power. The system comprises a power grid dispatching module, an energy storage EMS module, a coordination control module and each energy storage system module, the response speed can be increased, the problem of battery imbalance is solved, the coordination stability with the power grid is enhanced, and the practicability is high.

The invention discloses a method, a device, equipment and a medium for enhancing transient stability of networking type energy storage, and relates to the field of power electronic stability, and the method comprises the steps: carrying out the improvement of an active power control structure of initial networking type energy storage based on power deviation feedback and angular frequency deviation feedback, so as to obtain an improved control structure; determining a feedback compensation coefficient in the improved control structure according to the rated angular frequency of the power grid and the steady-state power angle of the network-building type energy storage before fault ride-through; and determining the transient power angle deviation of the network construction type energy storage during the fault ride-through period based on a nonlinear perturbation theory, and controlling the transient power angle deviation to be zero by using the feedback compensation coefficient and a preset constraint condition so as to enhance the transient stability of the network construction type energy storage. Therefore, the power angle fluctuation and the frequency fluctuation of the network construction type energy storage during the fault ride-through period can be greatly reduced, and the transient stability and the frequency stability of the network construction type energy storage are improved.

The invention provides a cooperative low-voltage ride-through control method and related device based on a network construction type and network following type three-terminal interconnection system, and the method comprises the steps: triggering a cooperative low-voltage ride-through control mechanism in response to a voltage drop fault generated at an AC side connected with a network construction type converter; performing cooperative control on each converter based on the mechanism; wherein the control network construction type converter only undertakes AC side voltage establishment and current safety survival functions, realizes current limiting control through adaptive virtual impedance, and does not participate in DC side energy adjustment of a common DC bus; the DC voltage control type grid-following converter is controlled to suppress DC voltage double-frequency fluctuation of the common DC bus, and actively absorb and compensate double-frequency power disturbance introduced by the grid-forming converter; and controlling the active power control type grid-following converter to avoid active power adjustment during the voltage drop fault period. A collaborative low-voltage ride through control mechanism is provided, the direct-current voltage fluctuation is reduced, and the overall low-voltage ride through capacity of the system is improved.

This invention discloses a series-parallel hybrid power flow control method and system, applied in the field of power grid power flow control. The method includes: determining power grid demand information based on key operating data of the transmission network; determining the equivalent active power control quantity of UPFC, the equivalent power flow regulation quantity of SSSC, and the equivalent reactive power control quantity of STATCOM based on the quantification results of the demand information, the first constraint data of the series-parallel hybrid power flow control device, and the second constraint data of the transmission network; and injecting equivalent voltage and equivalent current into the transmission network through the series-parallel connection of UPFC, SSSC, and STATCOM to regulate the key operating data of the transmission network. When power flow control is required in the transmission network, this invention injects controllable voltage and current into the transmission network through UPFC, SSSC, and STATCOM to achieve adaptive control of power flow on transmission network lines.

The invention discloses a coordinated optimization scheduling method for improving dynamic characteristics of a source storage response AGC regulation instruction. A frequency modulation performance index calculation method for a power generation unit to respond to an AGC instruction is deduced by researching transaction rules and policy documents of a domestic frequency modulation auxiliary service market, and a time-phased source-storage combined frequency modulation control strategy is designed according to the frequency modulation index calculation method. And then, an MOEA / D algorithm is utilized to optimize a micro-grid source storage optimal active power control strategy considering the power generation cost and the energy storage life under time-phased control. And finally, realizing coordinated optimization scheduling of each power generation unit under the optimal active power control strategy of the micro-grid based on model prediction control. The method can provide a reference for the source storage active power coordinated optimization scheduling of the micro-grid participating in the frequency modulation auxiliary service market.

A flexible loop-closing device and its active power control method are disclosed. The device includes a power electronic transformer and distribution networks connected to both sides. Each phase of the power electronic transformer includes several power modules symmetrically arranged on both sides. Each power module includes an H-bridge section composed of power electronic switching devices T1-T4 and a DAB section composed of power electronic switching devices T5-T8. The power modules on both sides are connected through a resonant inductor Lr and an isolation transformer T. The H-bridge sections of the power modules on the same side are connected in series to the high-voltage AC bus of the distribution network on the same side. The active power control method is as follows: the AC side of the loop-closing device is controlled by a cascaded H-bridge, and the DC side is controlled by a DAB. When there is no active power flow control requirement, the DAB section does not need to work, and the DC bus voltage of the power modules on both sides is controlled by their respective cascaded H-bridges. This method can simplify the operation complexity of the loop-closing device to the greatest extent, ensure the stable operation of the loop itself and the reliability of the system power supply, and greatly reduce the system losses when there is no active power flow control requirement. The active power control strategy proposed in this invention can avoid frequent switching of the cascaded H-bridge control mode, ensure the stable operation of the flexible loop-closing system, and improve the dynamic response speed.

The application provides a power flow inversion method of a direct current power transmission system, the direct current power transmission system comprising a power sending end and a power receiving end, the power sending end comprising a first converter, the power receiving end comprising an electrically connected second converter and at least one third converter, the type of the first converter being the same as that of the second converter, the type of the second converter being different from that of the third converter, the power flow inversion method comprising: determining whether the direct current power transmission system receives a power flow inversion instruction; in the case that the direct current power transmission system receives the power flow inversion instruction, obtaining a direct current voltage instruction value, and controlling the direct current voltage of the first converter to follow the change of the direct current voltage instruction value, the direct current voltage instruction value being stepwise reduced from a first predetermined value to a second predetermined value; controlling the active power of the second converter according to the direct current voltage of the first converter; and controlling the direct current of the third converter to remain unchanged. The method can overcome the complexity and current impact problem of the power flow inversion operation.

Embodiments of the application disclose a direct-drive wind turbine low-voltage ride-through control method and related equipment. The method comprises: generating a ride-through high-level signal to activate a low-voltage ride-through mode when a low-voltage ride-through trigger module detects that a current voltage value of a target power grid where a target direct-drive wind turbine is located is lower than a preset reference value; calculating a voltage drop depth according to the current voltage value and the preset reference value; a low-voltage period reactive power control module of a grid-side control system controls the target direct-drive wind turbine to output reactive power to the target power grid to support the power grid according to the voltage drop depth; and an active power control module of a machine-side control system controls output power of the target direct-drive wind turbine according to the voltage drop depth. The direct-drive wind turbine low-voltage ride-through control method overcomes the direct-current voltage overvoltage oscillation defect of the prior art and limits the machine-side electromagnetic power during the wind turbine low-voltage ride-through period from the source.

The invention discloses a power recovery control method and system after a fault of a DRU network-forming type fan, and the method comprises a voltage reference value control link which is used for obtaining a network-side voltage reference value; in the active power control link, based on the obtained grid-side voltage reference value, a d-axis voltage reference value of the output voltage of the converter of the DRU grid-forming type fan is obtained; the reactive power control link is used for obtaining a frequency control reference value; in the frequency control link, a q-axis voltage reference value of the output voltage of the converter is obtained based on the obtained frequency control reference value; and an inner loop voltage and current control link: based on the obtained d-axis voltage reference value and q-axis voltage reference value of the output voltage of the converter, obtaining a converter control voltage reference value. According to the method, the purpose of limiting the active power change rate in the fault recovery stage is achieved in a mode of voltage climbing after the fault.

The invention belongs to the field of electric power, and discloses an impedance measurement method, device and equipment for a network-forming inverter and a storage medium, and the method comprises the steps: obtaining an active power reference instruction and a filter capacitor voltage amplitude of an impedance test inverter, and a filter capacitor voltage amplitude of a tested inverter; based on the deviation between the active power reference instruction and the actually measured active power, virtual synchronous machine control is carried out through an active power control module to generate a dynamic power angle difference; inputting the active power reference instruction, the dynamic power angle difference, the filter capacitor voltage amplitude of the impedance test inverter and the filter capacitor voltage amplitude of the tested inverter into a line impedance calculation module; and according to a preset impedance calculation formula, the line impedance calculation module calculates the resistance and inductive reactance of a connection line between the impedance test inverter and the tested inverter.

The application discloses a wind turbine active power control method and device and a storage medium d The application discloses a wind turbine active power control method and device and a storage medium r The application discloses a wind turbine active power control method and device and a storage medium i The application discloses a wind turbine active power control method and device and a storage medium a The application discloses a wind turbine active power control method and device and a storage medium

The invention discloses a wind turbine generator active power control device, and belongs to the technical field of power control devices. Comprising a supporting plate, supporting columns are symmetrically and fixedly connected to the left side of the supporting plate, a bearing plate is jointly and fixedly connected to the left ends of the supporting columns, circular grooves are formed in the bearing plate and the supporting plate, rotating columns are rotatably connected to the interiors of the circular grooves, and a fan head is fixedly connected to the left side of each rotating column; fan blades are symmetrically and fixedly connected to the outer side wall of the fan head; according to the device, the safety in the operation process of the wind turbine generator is greatly improved by constructing an accurate rotating speed control mechanism. When the unit operates, the core control unit can track the rotating state of the fan head in real time, and once the rotating speed is close to or exceeds the critical value of safe operation, a regulation and control program can be quickly started. The power component is triggered through signal transmission to adjust the output strength.

This invention discloses a method for calculating the parameters of a constant AC voltage controller in a flexible DC converter station, including obtaining the short-circuit ratio S of the flexible DC converter station connected to a weak AC system. scr Obtain the equivalent capacitance C at the AC system connection point of the flexible DC converter station. pcc Obtain the simplified AC voltage closed-loop transfer function F. uu (s); Obtain the initial value K of the simplified AC voltage closed-loop transfer function unit step response. stepu and equivalent time constant τ u ; Calculate the constant AC voltage controller parameter k puac and k iuac Obtain the active power controller parameters and verify the calculated constant AC voltage controller parameters k. puac and k iuac Does the parameter constraint condition meet? This invention, through the proposed method for calculating the parameters of the constant AC voltage controller in flexible DC converter stations, reduces the time spent by engineering researchers in selecting outer loop controller parameters and improves research efficiency.

The application discloses a pitch angle control method considering fast active power regulation of a wind driven generator, which can reduce pitch angle fluctuation of all PMSGs during fast active power control, minimize fatigue damage of the wind driven generator, prolong the service life of the wind driven generator and reduce maintenance cost. P ; S2, a wake effect model of the wind farm containing mathematical models of the plurality of PMSGs is constructed to determine a plurality of pitch angles beta from the power coefficient c P ; and S3, a fast active power control model of the wind farm is constructed to satisfy minimum pitch angle beta fluctuation of the PMSGs.

This invention proposes a fast frequency control method and device for wind-solar-storage power stations, belonging to the field of fast frequency and active power control technology for new energy power stations. The method includes: at the arrival of each sampling period, updating the active power target values ​​of wind turbines, photovoltaics, and energy storage based on whether the grid connection frequency of the wind-solar-storage power station is outside the upper and lower limits of the frequency warning and the active power regulation capabilities of wind, solar, and energy storage, reserving the maximum active power regulation capability of photovoltaics and energy storage; calculating the total active power regulation of the wind-solar-storage power station based on whether the grid connection frequency is outside the upper and lower limits of the frequency and the active power frequency droop curve function; updating the active power target values ​​of wind turbines, photovoltaics, and energy storage based on the active power regulation demand and the active power regulation capabilities of photovoltaics and energy storage; and performing active power correction for energy storage and photovoltaics when the fast frequency response time arrives. This invention can utilize the fast active power regulation capabilities of photovoltaics and energy storage to compensate for the capacity loss due to the inability of wind turbine active power regulation to be implemented on time, restoring the fast frequency response capability of the power station.

The invention discloses a virtual synchronous machine control method for improving transient voltage inertia of a grid-connected inverter. The virtual synchronous machine control method comprises an active power control loop and a reactive power control loop with transient voltage inertia. On the basis of a traditional virtual synchronous machine control method, an inertia link is introduced into a reactive power control loop, and a reactive voltage loop is transformed into a second-order system from a first-order system so as to improve the dynamic response of an inverter when the voltage of a power grid drops. According to the invention, the change rate of the output voltage of the grid-connected inverter in the transient process can be effectively reduced, the power angle characteristic, the frequency characteristic and the voltage characteristic of the grid-connected inverter are improved, the negative influence caused by the voltage drop of the power grid is reduced, and the transient stability of the inverter is improved.

The application discloses a permanent magnet flywheel energy storage phase modifier system and a control method thereof. The permanent magnet flywheel energy storage phase modifier system comprises a controller, a converter, a flywheel, a permanent magnet speed regulating motor, a phase modifier and a shaft system. The phase modifier and the permanent magnet speed regulating motor are mounted on a power grid. The controller is used for acquiring the flywheel rotating speed, the active power and the frequency of the power grid, formulating an active power control strategy and sending a control signal. The flywheel and the phase modifier rotor are connected with the permanent magnet rotor and the armature rotor of the permanent magnet speed regulating motor through the shaft system. The converter is connected with the armature winding of the permanent magnet speed regulating motor and changes the power frequency according to the control instruction of the controller. The converter adjusts the rotating speed of the permanent magnet synchronous motor and the flywheel by changing the power frequency, so as to change the flywheel energy storage state. The energy is fed through the phase modifier and the permanent magnet speed regulating motor. The application can actively control the distribution process of the flywheel energy charging and discharging and the active power sending, and improves the inertia support capacity of the phase modifier.

The present application relates to the technical field of electrical control, and provides a method and apparatus for controlling increase of active power of a grid-forming converter, a device, and a medium. The method for controlling increase of active power of a grid-forming converter comprises: when a fault occurs in a power grid, determining an active power limiting curve on the basis of power angle stability limit parameters and converter alternating-current port data in the power grid; determining a second active power limiting value on the basis of the converter alternating-current port data and preset alternating-current overload threshold parameters; determining a third active power limiting value on the basis of battery charging and discharging parameters measured in real time; and determining limited equivalent mechanical power of a grid-forming converter for the power grid on the basis of the active power limiting curve, the second active power limiting value and the third active power limiting value. On the basis of limited equivalent mechanical power determined by analysis from the perspective of power angle stability, the perspective of ensuring that an alternating-current overload does not occur, and the perspective of battery charging and discharging, the present application can maximize increase of active power while avoiding power angle instability.