54 results about "Black start" patented technology

The application provides a voltage imbalance treatment method and system for a micro-grid black start process under an unbalanced load, comprising the following steps: S1, determining that the focus point for treating voltage imbalance of a three-phase three-wire inverter is to eliminate negative sequence voltage; S2, introducing a mathematical model describing a two times power frequency oscillation disturbance signal characteristic generated by the negative sequence voltage into a control loop; and S3, using a proportional integral control method combined with a quasi-resonant controller to suppress the two times power frequency oscillation component in the control loop, so as to realize negative sequence voltage suppression and voltage imbalance treatment. The application analyzes the mechanism of voltage imbalance problems of the three-phase three-wire inverter under various unbalanced loads, and reveals that the focus point for treating voltage imbalance problems is to eliminate negative sequence voltage.

The present application relates to the technical field of energy storage, and particularly relates to an energy storage black start system and a control method thereof, the system comprising a physical layer, a coordination control layer and a network communication layer; the physical layer comprises at least one black start power module, at least one load control module and at least one grid synchronization module, the coordination control layer comprises a centralized system management unit and a local autonomous controller, and the network communication layer is a star-shaped heterogeneous redundant network based on a time-sensitive network, and is used for realizing data interaction between the coordination control layer and the physical layer. The present application avoids the whole black start failure caused by single point failure and the start interruption caused by the mismatch between the preset plan and the actual situation, improves the success rate of black start, guarantees continuous high-quality power supply to sensitive loads, enhances the robustness under incomplete or delayed communication, ensures the completion of cross-layer instruction transmission and state synchronization within milliseconds, and prolongs the service life of equipment.

The present disclosure belongs to the technical field of power system restoration, and particularly relates to an orderly black start method and system of a new energy power generation unit, comprising: acquiring system parameters of the new energy power generation unit; constructing a black start system model of the new energy power generation unit based on the acquired system parameters; evaluating the black start capability of the constructed black start system model to obtain a black start utility output of the new energy power generation unit; and optimizing the start order of the new energy power generation unit according to the acquired system parameters of the new energy power generation unit and the obtained black start utility output, combining an orderly participation algorithm to complete the orderly black start of the new energy power generation unit.

This invention discloses a dynamic response-based load identification method and related equipment for energy storage black start, overcoming the high risk of secondary system collapse caused by blindly closing the circuit to unknown loads during the energy storage black start process. This method generates customized safety test pulses based on the power line physical parameters using a pulse parameter model before formally closing the circuit to power, and collects and analyzes the dynamic response signals of the load to achieve proactive identification of the load's health status. This invention transforms load recovery during energy storage black start from blind closing to a controllable process of diagnosis before power supply, fundamentally reducing the risk of secondary system collapse due to faulty load access.

This invention relates to the field of wind power converter control, and provides a method and system for switching control between black start and islanded operation of a wind power converter. Before responding to a closing command, the method first predicts the new steady-state operating point to be reached after load connection, including steady-state values ​​such as PCC voltage and converter output current, based on the electrical parameters of the load to be connected. Then, it calculates the corresponding state values ​​that the integrators of the voltage and current loop PI controllers inside the converter should possess at the new steady-state operating point. Finally, at the instant the circuit breaker closing signal is issued, these pre-calculated integrator state values ​​are synchronously preset into the controller's integrator. In this way, the controller's internal state is already near the new steady state at the moment of load connection, thus skipping the transient process of response lag and error accumulation in traditional PI controllers, achieving a smooth transition from no-load to loaded, and effectively suppressing voltage and frequency surges during the switching process.

This invention discloses a DC / DC converter and control method suitable for offshore wind farms. The invention uses a boost converter to realize the boost voltage and power transmission of the full DC wind farm bus, and a buck converter to establish the AC side grid voltage during the wind farm startup phase, providing the startup power of the wind farm and realizing black start of the offshore wind farm. Furthermore, by controlling the MMC and diode uncontrolled rectifier, fault ride-through under short-circuit faults on both DC buses can be achieved, ensuring the reliable operation of the power transmission system.

The application belongs to the technical field of black start control of power grid system, and particularly discloses a black start DC excitation regulator and a control method thereof applied to a black start system. The black start DC excitation regulator comprises a rate limiter and a PID controller. The black start DC excitation power source outputs an excitation step signal to a signal input end of the rate limiter. An output signal of the rate limiter is compared with a terminal voltage of a feedback machine, and a difference value is output to a signal input end of the PID controller. An output signal of the PID controller is sent to a generator terminal. The control method comprises the following steps: constructing a black start system; starting initial excitation of the black start DC excitation power source, and adjusting the terminal voltage of the generator through the black start DC excitation regulator; switching to an AC excitation adjustment mode; starting a load, and operating the black start system. The application shortens the excitation time of the black start system with zero start-up and voltage rise, and improves the probability of one-time successful excitation. The application is suitable for black start control of a power grid.

The application provides a DRU-LFAC system and a wind turbine generator network type control and black start control method, and relates to the technical field of wind power generation. The offshore wind farm is a permanent magnet direct drive full power wind turbine generator, low frequency alternating current is sent to the onshore back-to-back converter through a low frequency side subsystem, the onshore back-to-back converter converts the low frequency alternating current into high frequency alternating current and sends the high frequency alternating current into an onshore power grid, the onshore back-to-back converter comprises a twelve-pulse diode rectifier unit and a modular multilevel converter, and a filter is used for reactive power compensation. The DRU-LFAC system has active power-voltage coupling characteristics and reactive power-frequency coupling characteristics. The application solves the problems that the low frequency side power characteristics of the current DRU-LFAC system are different from those of the traditional power system and cannot be effectively analyzed, the current traditional wind turbine generator control strategy is not applicable to the DRU-LFAC system, and the offshore wind farm cannot be started through a conventional process due to the unidirectional conduction characteristics of the DRU.

The utility model relates to the field of wind power hydrogen production, especially off -grid renewable energy hydrogen production system with black start power supply, the hydrogen production system includes: wind power generation side, including at least one wind turbine unit, each wind turbine unit is used to carry out wind power generation, transmission line is used for transmission each wind turbine unit produces electric power, hydrogen production side includes: at least one hydrogen production station, each hydrogen production station is connected to transmission line, and each hydrogen production station includes hydrogen production equipment, hydrogen storage equipment, hydrogen production equipment is used to utilize the power transmission line comes to make hydrogen, hydrogen storage equipment is used for hydrogen storage, black start power supply includes hydrogen fuel cell, is used to utilize hydrogen production equipment or hydrogen gas power generation of hydrogen storage equipment, to realize black start when the power failure of wind power generation side, the utility model embodiment can give consideration to the problem of reliability and high cost, and convenient coordination control operation and operation and maintenance management.

This invention discloses a hybrid energy storage collaborative control method based on adaptive variable-step-frequency TCN-SAC, belonging to the field of intelligent energy management and predictive control technology. The method first classifies scenarios into three categories—normal, abnormal, and fault—based on grid fault characteristics and heterogeneous energy storage properties, and constructs a hybrid energy storage system model. Relevant time-series variables are collected, and the model is trained using an adaptive variable-step-frequency TCN network to output supply and demand variable prediction information. Grid fault state data, historical system operation data, and prediction information are integrated to form the SAC algorithm input vector. A multi-objective reward function covering system revenue, energy storage lifetime, and reliability is constructed. Based on this function, a collaborative control strategy is iteratively output, repeatedly executed until the reward function is maximized. Several types of energy storage systems respectively undertake peak shaving, frequency regulation, voltage regulation, and black start functions, achieving collaborative operation under differentiated scenarios.

The application relates to the technical field of new energy black start control, and discloses a wind storage system black start method and device based on a fuzzy state machine, which comprises the following steps: obtaining state variables of wind storage system black start; wherein the state variables of wind storage system black start include a direct-current bus voltage, an alternating-current bus frequency and a storage battery capacity; performing fuzzy processing on the state variables of wind storage system black start by using a membership function to obtain membership values; performing fuzzy reasoning based on the membership values to determine a wind storage system black start fuzzy state; inputting the wind storage system black start fuzzy state into a pre-set fuzzy state machine to obtain a wind storage system black start control strategy; and controlling wind storage system black start based on the wind storage system black start control strategy. The application realizes soft switching of different operating states in the wind storage system black start process and black start control of the wind storage system, and has stronger robustness.

This invention belongs to the field of power system restoration technology, and relates to a method and apparatus for dynamic partitioning of new energy power systems during black start based on Voronoi diagrams. The method includes: mapping black start power sources to Voronoi generators and mapping loads to be restored to Voronoi spatial points; acquiring generator capacity information and generating reliable capacity for new energy black start power sources; generating adaptive weights based on capacity information, reliable capacity, and load density; adjusting the diffusion speed of generators in different directions according to the adaptive weights and performing weighted Voronoi diffusion to obtain preliminary partitions; performing partition constraint verification during diffusion and controlling the corresponding generator to exit diffusion when the constraint reaches the upper limit; triggering update calculation based on new energy output information fed back by SCADA and outputting the partition results. The technical solution of this application can realize online partition updating and executability determination.

A method and system for performing blackstart functionality from renewable generation and battery energy storage systems are disclosed. A plant may include a microgrid that includes one or more customer loads and that may provide power to a utility grid. Blackstart may be performed to restore operations to part or all of the plant or to external loads such as microgrid customer loads or part of the utility grid. In practice, blackstart may be performed in order to restore operation to the one or more feeders in the plant, such as to the generation sources within the plant, to restore power to the plant auxiliary loads, customer loads in the microgrid, and to provide power to different sections of the grid when transitioning from shutdown mode of operation. In this way, the method and system may automatically transition from a shutdown mode of operation to an islanded mode of operation.

A black start system for an integrated energy peak-shaving gas-fired power plant includes a main power grid, a backup power grid, a photovoltaic power generation unit, an energy storage device, a diesel generator, a step-up transformer, and a 6kV load section for plant use. The main power grid is connected to the 6kV load section for plant use via a first switch. The backup power grid is connected to the 6kV load section for plant use via a second switch. The photovoltaic power generation unit includes photovoltaic panels and a photovoltaic inverter connected to the photovoltaic panels. The output of the photovoltaic inverter is divided into two paths: one path is connected to the photovoltaic power grid, and the other path is connected to the input of the energy storage device. The output of the energy storage device is connected in parallel with the output of the diesel generator via a discharge switch, and then connected to the low-voltage side of the step-up transformer. The high-voltage side of the step-up transformer is connected to the 6kV load section for plant use. The 6kV load section for plant use supplies power to the auxiliary systems of the gas turbine, achieving the fundamental purpose of successfully implementing the black start of the power plant by supplying power to the key auxiliary systems of the gas turbine.

The application discloses an energy storage system, comprising an AC-DC converter, an auxiliary device, an energy storage converter and a plurality of first DC-DC converters; the first ends of the plurality of first DC-DC converters are connected to corresponding battery packs, and the second ends of the plurality of first DC-DC converters are connected to an equalization bus; the DC end of the energy storage converter is connected to a battery cluster, the AC end of the energy storage converter is connected to the AC end of the AC-DC converter, and the AC end of the energy storage converter is used for connecting a power grid; the DC end of the AC-DC converter is connected to the equalization bus; and the battery cluster comprises a plurality of battery packs. The auxiliary device is connected to the equalization bus, and in a black start process, the battery packs can be used to supply power to the auxiliary device, and an USP does not need to be additionally arranged, thereby reducing the operation and maintenance cost of the energy storage system.

This invention provides a method and system for black-starting V2G charging piles, relating to the field of V2G charging pile black-start technology. The method includes a protocol control module detecting the Type-C interface electrical signal; when a portable power module is connected, performing a USB-PD protocol communication handshake with the portable power module via the CC channel; reading the PDO message of the power data object and obtaining capability parameters; the protocol control module controlling the portable power module to output high-voltage DC power to supply power to the control circuit of the V2G charging pile and wake up the control unit; the control unit establishing a discharge protocol communication link with the vehicle's BMS; generating a contactor closing command after discharge interaction and insulation detection; controlling the vehicle to close the high-voltage contactor; establishing a high-voltage DC output link; and the control unit converting the high-voltage DC power into industrial frequency AC power for output to household loads, thereby reducing the cost of black-starting V2G charging piles and improving operational safety and low-temperature starting performance.

This utility model discloses an energy storage combiner cabinet equipped with dual voltage sources and a UPS. The main circuit draws power from the grid side or the output of the power conversion system. The front end of the combiner cabinet's control circuit is configured with a UPS, a black start button SB1, and a switching circuit consisting of relays KA2 and KA3, and contactor KM1. When mains power is available, contactor KM1 is engaged, relay KA2 remains open, and relay KA3 remains closed, switching the combiner cabinet's control circuit to mains power mode. When mains power is unavailable, contactor KM1 is disengaged, relay KA2 is engaged, and relay KA3 remains closed, switching the combiner cabinet's control circuit to UPS battery mode. The black start button SB1 can then be used to start the combiner cabinet and the external battery cabinet's control circuit. This combiner cabinet provides auxiliary power, reducing the need for long-distance power draw from the battery cabinet. Before the system is operational and in case of PCS or voltage source anomalies, it stably provides a voltage source to the combiner cabinet and battery cabinet's control circuits for a period of time to start the system or for emergency fault response.

The application provides a power system and a power system black start method, wherein the method can include: a main power supply connected with a first bus and a second bus; the first bus is used for connecting a first type of power equipment, and the main power supply and the first type of power equipment are connected through a first switch group; the second bus is used for connecting a second type of power equipment; a first backup power supply connected with a third bus; the third bus is used for connecting the first type of power equipment; wherein the main power supply is used for supplying power to the first type of power equipment and the second type of power equipment; in the case that the main power supply loses power, the first backup power supply is used for supplying power to the first type of power equipment during the power system black start. Through the above power system, power supply to some necessary equipment during the black start can also be realized, and the safety of the power system black start is improved.

The application discloses a power grid segmentation recovery strategy based on a light storage combined power generation system and relates to the technical field of power system fault recovery. When the power grid is powered off due to a fault, the energy storage system provides voltage frequency support for photovoltaic grid connection, and the energy storage system inverter adopts V / f control. After a stable grid connection bus voltage is established, the photovoltaic system adopts a control mode of fixed DC voltage and fixed reactive power for grid connection, and a virtual synchronous control is added at the same time, so that the photovoltaic system has inertia damping characteristics. After the photovoltaic system is connected to the grid, the auxiliary system is started and then the conventional unit is put into operation, meanwhile, the energy storage system is switched from V / f control to P / Q control, and an additional damping controller is configured. The application not only can complete the stable recovery of the power grid, but also can improve the stability of the photovoltaic system and inhibit the subsynchronous oscillation generated in the black start process.

The application discloses a self-adaptive SOC equalization control method in a black start process of an energy storage system. Compared with the prior art, the application has the following beneficial effects: compared with the traditional black start control strategy of the energy storage system, the method disclosed by the application effectively realizes SOC balancing and power sharing of different energy storage units in the energy storage system by using a self-adaptive SOC equalization strategy. The application provides an energy storage system capacity configuration strategy in the black start process and a safety threshold of charging and discharging power of each energy storage unit of the energy storage system. The method disclosed by the application improves the stability and reliability of the black start process of the energy storage system.

This application relates to the field of wind-solar-storage integration technology, and in particular to a wind-solar-storage integrated system based on a truss tower and its black-start method. It includes: a wind power unit comprising multiple wind electronic modules; wherein each wind electronic module includes a wind turbine and a truss tower; multiple tower base areas are set within the truss tower; a photovoltaic unit comprising a mounting module and multiple photovoltaic arrays, the photovoltaic arrays being set in each tower base area; an auxiliary integration unit comprising an energy storage module and an integrated conversion layer; and a management unit for acquiring grid monitoring data and determining whether to generate a black-start command based on the grid monitoring data. By optimizing the wind turbine's base structure and utilizing the truss tower to construct a "photovoltaic skirt" (i.e., multiple sets of photovoltaic arrays) surrounding the tower base, space utilization is improved, and the equipment parameters of the photovoltaic arrays are dynamically adjusted according to the solar resources of different tower base areas to improve power generation efficiency and maximize economic benefits.

This application provides a multi-source coordinated black-start control method for islanded operation of a microgrid in a park, relating to the field of power system automation control technology. The method includes: generating fingerprints for heterogeneous power sources using a dynamic characteristic tag library and constructing a decoupling map to delineate control channels with different response speeds. Based on the system voltage recovery process, power sources in different channels are controlled in stages to intervene in specific modes: in the extremely low voltage stage, the fastest-response power source establishes voltage through discrete pulse injection; in the medium voltage stage, medium / slow-speed power sources intervene as controlled current sources to form a composite power source; and in the high voltage stage, nonlinear power sources are activated and their control algorithms are reconstructed. This method achieves dynamic decoupling at multiple physical scales and sequential energy flow reconstruction, effectively solving the problem of multi-source coordinated instability under extreme low voltage conditions.

The application provides a power distribution network power supply service recovery planning method and device for extreme weather and related products, and relates to the technical field of power distribution networks. The method pre-establishes a flexible microgrid topology based on branch interruption scenarios, optimizes the allocation of mobile repair power supply vehicles, and configures node black start capability; when an extended extreme event occurs, the microgrid topology is reconstructed, the network topology and node power-on state are adjusted; the reinforcement scenario intelligent fuzzy set and the wind power output fuzzy set are used to represent two types of uncertainties, namely branch random interruption and wind power output fluctuation; a distributed robust optimization model is established by combining distributed system operation constraints and long-time energy storage operation constraints; the column and constraint generation algorithm with parallel alternating optimization method is used to solve the model; finally, the power distribution network recovery service performance evaluation coefficient is calculated to quantitatively evaluate the recovery effect. The application can effectively cope with multiple uncertainties under extreme weather, optimize the recovery resource scheduling, and improve the robustness and economy of the power distribution network power supply recovery.

This invention discloses a black start control method and system based on multi-station linkage. It adopts the coordinated starting of multiple types of black start power sources to realize black start control of multiple substations. Combined with the self-diagnosis of black start power sources and the judgment and screening of black start recovery paths, it implements hierarchical dynamic black start control, simplifies the black start operation, reduces the cost of black start, and improves the stability of black start of energy storage systems. It also incorporates mobile energy storage devices to reduce the setup and maintenance costs of black start power sources and improve their starting capability. In addition, during the black start process, a heuristic function is designed based on the failure rate of the selected path equipment to select the path with the lowest failure probability as the recovery start path as much as possible. The top three recovery start paths are calculated and tried to improve the success rate of black start.

This application relates to the field of mobile energy storage system control technology, specifically to a mobile energy storage system with hybrid power buffering and graded black start functions, and its control method, equipment, and medium. The mobile energy storage system includes a main energy storage unit with lithium iron phosphate battery clusters connected to a DC bus via a contactor, a hybrid power buffer unit containing a supercapacitor module and an isolated bidirectional DC / DC converter, and a combiner control cabinet integrating a defense control center containing an auxiliary energy module and an emergency power replenishment interface. The control method includes activating the auxiliary energy to power the control unit; charging the supercapacitor by the auxiliary energy when the bus loses power and the supercapacitor is depleted; outputting a test pulse to diagnose short circuits; closing the contactor with zero differential voltage after boosting and pre-charging the bus; coordinating output during load transients; and replenishing the supercapacitor and auxiliary energy by the main battery during steady state. This application can achieve full-process autonomous black start and adaptive power buffering in off-grid environments, improving system survivability and battery life.

The present disclosure relates to the technical field of network-constructing energy storage, and particularly relates to a black start technology simulation method, device, equipment, medium and product. The method comprises: performing simulated power failure processing on a built power system according to a preset target fault type; starting an energy storage converter and adjusting parameters of the energy storage converter according to a control strategy; starting an auxiliary converter and adjusting parameters of the auxiliary converter according to the control strategy; starting the electronic load when the energy storage converter and the auxiliary converter are in a stable output state, increasing the load of the electronic load according to a load recovery strategy, and continuously collecting operation data of the power system under different loads; and updating the control strategy of the energy storage converter and the auxiliary converter and the load recovery strategy based on the operation data. The preset target fault type can cover multiple faults, and fault simulation and fault recovery are performed on each fault type one by one, which is conducive to improving the comprehensiveness of the simulation results.

This invention relates to the field of offshore wind power DC transmission technology, and discloses an offshore wind power multi-site hybrid valve network transmission system and method. The system includes multiple interconnected offshore wind farm hybrid valve network transmission subsystems, each subsystem comprising: a first converter module, a second converter module, a third converter module, and an onshore converter station. This invention achieves power mutual assistance and voltage support among multiple sites through topological connection and coordinated control of the first, second, and third converter modules and the onshore converter station in the multiple interconnected subsystems. It adaptively switches between four control modes: black start, single-site near-zero, full-site near-zero, and recovery, adjusting the hybrid valve topology and power flow path to improve the system's operational continuity and reliability under all operating conditions.

This invention discloses an autonomous black-start system and method for energy storage converters under grid-free islanding conditions, relating to the fields of microgrid energy storage and novel power system technologies. The system includes an onboard energy management system, a battery management system, an auxiliary power system, an energy storage battery pack, a static transfer switch, and an energy storage converter. The auxiliary power system bypasses conventional processes to directly wake up the underlying control loop. The onboard energy management system controls the energy storage converter to actively disconnect from the grid tracking mechanism. The energy storage converter autonomously and independently performs rapid AC voltage build-up based on an embedded high-speed computing chip. After voltage build-up, it switches to an off-grid constant voltage and constant frequency operating mode, providing initial startup power to paralyzed loads through the static transfer switch. This invention solves the startup deadlock problem when the external mains reference voltage is lost, realizing autonomous black-start of the microgrid and restoration of regional power supply.