103 results about "Active power control" patented technology

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.

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 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 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.

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 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 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.

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.

This invention relates to the field of data management technology, and discloses an Internet of Things (IoT) terminal management method and system. By receiving the total power generated by each IoT terminal in a photovoltaic (PV) power plant, the total output power of the PV power plant is determined. When the active power value generated by the PV power plant or the actual value of the high-voltage busbar of the PV power plant's main transformer is compared with the target value issued by the dispatch center, the active power limit of the inverter is automatically adjusted to bring the current active power or voltage generated by the PV power plant closer to the target value, improving accuracy and control speed, meeting grid demand, enhancing the peak-shaving capability of the IoT system, ensuring that the operation of the new energy power plant and the grid is within a safe and controllable range, and calling upon the planned total output power of the PV power plant, thereby realizing active power control and reactive power control of the PV power plant. It tracks the active power adjustment target value and reactive power adjustment target value issued by the dispatch center, achieving the grid connection technology requirements for high-precision peak-shaving of the PV power plant.

This application discloses a method and apparatus for three-phase imbalance and harmonic compensation, relating to the field of power distribution network control technology. It synchronously collects three-phase voltage on the grid side, three-phase current on the load side, and DC bus voltage at multiple consecutive moments from an active power control device. Based on this, a time-series data sequence is constructed and input into a pre-trained gated cyclic unit network to obtain the initial compensation current. The DC bus current compensation component is determined based on the DC bus voltage and its reference value. The loss current component is estimated based on the current switching state function and output current of the active power control device, and the target compensation current is determined accordingly. A current tracking error vector is determined based on the target compensation current and the actual compensation current. A switching drive signal is generated based on the current tracking error vector. Under the control of the switching drive signal, the target compensation current is output, thereby achieving the mitigation of load harmonics, reactive power, and three-phase imbalance components.

The invention discloses a control method for improving transient performance of a network-forming converter, and the method comprises the steps: active power control: employing a second-order sliding mode control method, outputting an electromagnetic power reference value based on the construction of an improved integral sliding mode surface and a power angle error determined by an actually measured power angle and a target power angle, and adjusting the active power actually output by the converter; reactive power and voltage control: adopting a switching control method to select a direct voltage control mode or a reactive power-voltage droop control mode based on the relationship between the actual output voltage of the converter and a preset safety voltage threshold; fault transient current suppression: when a power grid fault is detected, inputting dynamic virtual impedance, adjusting the ratio (R / L) of resistance to inductance of the dynamic virtual impedance, and actively changing the total loop impedance characteristic of the output end of the converter; after the voltage of the power grid is recovered, the virtual recovery resistor is put into use, and transient current in the voltage recovery period is suppressed.

This application proposes a method and system for suppressing oscillations in heterogeneous wind farms. The method includes: real-time acquisition of voltage amplitude deviation and voltage phase angle deviation values ​​at the grid connection point in the heterogeneous wind farm; inputting the voltage amplitude deviation and voltage phase angle deviation values ​​at the grid connection point into a pre-established damping controller to obtain an active power adjustment value for suppressing oscillations in the heterogeneous wind farm; inputting the active power adjustment value into the active power control loop of each wind turbine unit in the heterogeneous wind farm to adjust the active power output of each wind turbine unit in the heterogeneous wind farm, thereby achieving low-frequency oscillation suppression in the heterogeneous wind farm; wherein, the heterogeneous wind farm includes: grid-connected wind turbine units and grid-connected wind turbine units. The technical solution proposed in this application can stably suppress low-frequency oscillations in heterogeneous wind farms under different grid strengths, ensuring the safe and stable operation of the wind farm and the power grid.

The invention belongs to the technical field of new energy power generation, and provides a synchronous motor interface new energy power generation transient circuit control method and system, and the method comprises the steps: constructing a multi-stage inductance transient circuit topology which comprises a series connection type structure and a parallel connection type structure; the method comprises the following steps: constructing an on-off time sequence of a multi-stage inductive transient circuit switch based on a multi-stage inductive transient circuit topology, and determining a switch action sequence according to a topology type; based on the switch action sequence, constructing a motor excitation control strategy during a transient state, and adjusting reactive power by adopting a generator terminal voltage proportion control equation; and constructing an inverter transient control strategy based on the switching action sequence, carrying out active power control based on the rotating speed of the motor, and adjusting q-axis current by adopting a rotating speed PI control equation. According to the invention, synchronous machine interface new energy power generation achieves short-circuit current and reactive power support capability close to those of a phase modifier at the moment of power grid fault, and has active power output capability when a transient circuit is put into use during the power grid fault period.

This invention provides an active power regulation method and system that considers instantaneous energy distribution efficiency, relating to the field of wind power grid-connected control technology. The invention establishes a synchronized operation system model based on the system parameters of the wind turbine and synchronous machine, determines the total inherent active power regulation coefficient and synchronous torque coefficient of the system to obtain the conservative instantaneous power of the synchronized system; introduces an active power regulation proportional coefficient into the model and constructs an instantaneous energy function during synchronized system oscillation, analyzing the instantaneous energy distribution law between synchronized units; after a disturbance, the instantaneous energy distribution efficiency is determined based on the instantaneous energy of the synchronous machine, a target efficiency is given, and the active power regulation proportional coefficient is solved based on the total instantaneous energy conservation, thereby calculating the design value of the active power regulation coefficient and setting it in the active power controller of the wind turbine unit, so that when the system detects frequency or power disturbances, the wind turbine participates in regulation according to the design value, thereby improving the power oscillation suppression capability.

The application discloses a simulation method and system for flexible load participating in active power automatic control of a power grid, and the method comprises the following steps: based on a pre-constructed flexible load simulation model, flexible loads with active power control capability of the power grid are aggregated to obtain a flexible load equivalent generator unit; a disturbance of the power grid system is simulated, power adjustment is performed by AGC, and power distribution is performed on all generator units of the power grid; and the flexible load equivalent generator unit performs power control on each flexible load respectively based on the distributed power. The application effectively analyzes the influence of the flexible load of the power grid participating in the active power control of the power grid on the operation of the power grid.

The invention belongs to the technical field of power systems, and particularly discloses a singular perturbation-reactive decoupling-based order reduction method and device for a network construction type converter. According to the invention, the original state space model is converted; on the basis of a singular perturbation strategy, order reduction processing is carried out according to target variable characteristics; order reduction processing is carried out on a voltage dynamic equation in a reactive power control outer ring, reactive power decoupling is carried out in the mode that a voltage state variable is introduced into an active power control state equation, and a differential equation based on the phase angle relation is established. Through the above mode, aiming at the electromagnetic dynamic process of the fast subsystem, order reduction processing is carried out on the electromagnetic dynamic state variable based on the singular perturbation strategy, order reduction processing is carried out on the voltage dynamic equation in the reactive power control outer loop, high-order dynamic items are eliminated, main dynamic characteristics in the state space are reserved, the model order and the solving complexity are obviously reduced, and the reliability of the system is improved. Therefore, the model order can be systematically reduced on the premise of ensuring key dynamic characteristics and stability analysis precision.

This invention discloses a method, device, electronic equipment, and storage medium for active power control of energy storage converters, belonging to the field of energy storage converter control technology. The method includes: acquiring the total regulation command, target regulation direction, and real-time active power and state of charge of each energy storage converter; determining the maximum regulation power of each energy storage converter according to operating constraint parameters and accumulating them in a preset order; determining the preceding energy storage converter, the last energy storage converter, and the remaining energy storage converters accordingly; allocating regulation power separately and generating a target power command; and controlling the output active power of each energy storage converter according to the target power command. Therefore, by implementing this invention, the problems existing in the prior art, such as the easy triggering of the underlying system protection limit when multiple sets of energy storage converters perform power coordinated regulation, and the insufficient matching accuracy between the actual output power of the entire station and the dispatch command due to the residual of the end allocation, can be solved.

This invention proposes a dual-control method and system for power regulation fees and AVC (Active Power Control) assessment at renewable energy power plants based on multi-objective collaborative optimization. Belonging to the field of renewable energy power generation prediction technology, the method includes: establishing separate power regulation fee cost models and AVC assessment cost models, and constructing a joint objective function based on these models; constructing real-time optimization models for active and reactive power regulation at each time step based on the joint objective function; and using a particle swarm optimization algorithm to perform real-time calculations of the real-time optimization models, outputting the optimal solutions for active and reactive power regulation at the next time step. This invention optimizes the power control of renewable energy power plants by comprehensively considering power regulation fees and AVC assessment factors, reducing plant operating costs and achieving optimal control of renewable energy power plant operation.

The application discloses a wind turbine active power control method and device considering electromagnetic torque smoothing and a storage medium, and belongs to the technical field of fan control. e , power instruction P cmd and rated speed ω N ; the reference speed ω ref required to be tracked by the fan in the active variable speed operation mode is calculated based on the electromagnetic power output P e ; the electromagnetic torque T e1 required for realizing that the actual wind wheel speed ω tracks the reference speed ω ref in the active variable speed operation mode, and the theoretical electromagnetic torque T e2 corresponding to the fan electromagnetic power output P e responding to the power instruction P cmd are calculated; and the electromagnetic torque instruction T e_ref is calculated based on the electromagnetic torque T e1 and the theoretical electromagnetic torque T e2 . The application superimposes the theoretical electromagnetic torque corresponding to the power instruction, smoothes the electromagnetic torque instruction of the fan, further reduces the corresponding deviation of the fan, and avoids frequent adjustment of the electromagnetic torque instruction and continuous fluctuation of the output power.

This invention discloses a wide-area source-storage active power real-time control method and system adapted to frequency regulation clearing results. When the system receives a request for renewable energy power regulation from the entire network or when the power flow of a controlled section exceeds its limit, it acquires the current network-wide operating data, determines the set of controlled renewable energy power plants, the set of frequency regulation winning bidders, and the set of operating constraints; calculates the required renewable energy power regulation for the entire network; filters out the set of associated power plants and calculates their overall control commands; after ensuring that the safety margin of each constraint meets the requirements, commands are allocated to power plants not associated with key constraints; if energy storage is configured within the power plant, the overall command is decomposed into renewable energy unit commands and energy storage charging commands according to the principle of maximizing renewable energy absorption; finally, the control commands are sent to each renewable energy power plant and its supporting energy storage system to execute active power control. This invention achieves synergy between frequency regulation market execution and real-time grid security control, improving renewable energy absorption capacity and system operation economy.

The invention discloses a power oscillation suppression method for a grid-forming type energy storage converter parallel system, and belongs to the field of micro-grid power utilization. Acquiring a three-phase output voltage and a three-phase current; calculating instantaneous active power and reactive power by using the three-phase voltage and the three-phase current, and constructing an active power control loop and a reactive power control loop; calculating an active damping compensation amount; angular frequency required by the system and a system phase damping an oscillation component in the active power are calculated; calculating a reactive power damping compensation amount; calculating a reference voltage amplitude required by the system and damping an oscillation component in reactive power; a three-phase voltage, a three-phase current, a system phase damping an oscillation component in active power and a reference voltage amplitude damping an oscillation component in reactive power are sent to a voltage control loop and a current control loop to generate a modulation signal and convert the modulation signal into a control signal, and the control signal acts on a converter so as to suppress oscillation. Damping compensation branches are designed from an active control loop and a reactive control loop, system damping is greatly increased, and the interactive oscillation phenomenon of the grid-forming type energy storage converter parallel system can be effectively restrained.

The invention relates to the technical field of fault processing of a grid-forming type flexible direct current power transmission receiving end power grid, in particular to a grid-forming type flexible direct current system transient stability improvement control method, device and equipment under a receiving end fault and a medium, and the method comprises the steps that the operation state is judged by monitoring the electrical parameters of the receiving end power grid in real time, and a transient stability improvement mode is started after the fault is recognized; the method comprises the steps of obtaining the angular acceleration of a network-forming type modular multilevel converter, calculating the voltage correction of a DC bus, determining whether a candidate DC voltage reference value and the capacitor voltage fluctuation of a sub-module exceed the limit or not, adaptively generating a final reference value and an active power control instruction, and achieving the active energy balance and DC voltage stable control during a fault period. By introducing angular acceleration feedback and a virtual inertia and virtual damping self-adjusting mechanism, direct-current overvoltage and power angle overshoot are suppressed, transient unbalanced power can be absorbed without an additional energy consumption device, the system cost is reduced, and the dynamic stability and operation safety of the network-forming type converter under the receiving end fault working condition are improved.

This invention discloses an active power control strategy for interconnecting energy storage power and clean energy sources. The strategy coordinates the control of energy storage power and clean energy through a complementary integrated power control center. This center comprises a complementary integration unit, an energy storage power unit, and a clean energy unit. The complementary integration unit sends instructions to the energy storage power unit and the clean energy unit, including instructions to allocate target active power values ​​for the energy storage power unit and to generate start-up and shutdown operation suggestions for the clean energy power units. This satisfies the total active power setpoint of the complementary integrated power system (comprising energy storage and clean energy) and the regulation requirements of primary frequency regulation, as well as the charging and discharging requirements of the energy storage power battery. This invention introduces adjustments to the battery state parameters of each energy storage power unit and suppresses the overall sensitivity of the control strategy, achieving good economic efficiency and stability in the combination of clean energy and energy storage power.