74results about "Contigency dealing ac circuit arrangements" patented technology

Disclosed is a system and method for automated outage and workflow planning system in a distributed electrical power grid with planned de-energization of electrical equipment as opposed to responding to an unplanned power outage. An automated system provides core conflict resolution and power outage planning. The present invention automatically notifies requestors of upcoming work orders. In addition, the present invention reduces scheduling inefficiencies by requiring requestors to confirm, decline, or edit on the fly their pending work order(s). The system also determines if all the orders are not completed and places the order back on the calendar for another day.

This application provides an MLPE device and a control method thereof, and a photovoltaic system. When determining that receiving of a heartbeat signal is continuously interrupted from a first time point to a second time point, the MLPE device considers that signal receiving is abnormal. If it is determined that an output current is less than a current threshold, it indicates that the MLPE device is in a scenario in which safe shutdown is required, and an output voltage is controlled to be less than a voltage threshold or output power is controlled to be less than a power threshold. If it is determined that the output current is greater than or equal to the current threshold, it indicates that the MLPE device is in a scenario in which a communication signal is unstable and that an output can be maintained. In this case, the output voltage is controlled to be greater than or equal to the voltage threshold or the output power is controlled to be greater than or equal to the power threshold from the second time point to a third time point, to prolong output time of the photovoltaic system, and increase effective hours of the photovoltaic system. If receiving of the heartbeat signal is continuously interrupted from the second time point to the third time point, it indicates that signal receiving is not recovered to normal, and the output voltage is controlled to be less than the voltage threshold or the output power is controlled to be less than the power threshold.

A protection system of ship's power distribution system, when a fault occurs in the feeder preset to be in charge of the third circuit breaker module, the relay of the third circuit breaker module trips the circuit breaker based on a magnitude and a direction of a fault current, and to transmit a power distribution maintenance signal to the relay of the second circuit breaker module. When a fault occurs in the switchboard preset to be in charge of the second circuit breaker module, the relays of the second and third circuit breaker modules trip the circuit breaker based on a magnitude and a direction of a fault current and the relay of the second circuit breaker module transmit a power distribution maintenance signal to the relay of the third circuit breaker module preset based on the magnitude and direction of the fault current.

Disclosed is a method for analyzing voltage stability based on a multi-swing characteristic of a voltage disturbance curve, including the following operations. A main server acquires a voltage disturbance curve of at least one node; and for each voltage disturbance curve, analyzes the voltage disturbance curve based on a multi-swing characteristic, to determine analysis time and a number of processing layers for curve wavelet package decomposition corresponding to the voltage disturbance curve. The main server establishes an analysis task for each node, and distributes the analysis task to at least one sub-server. For one of the at least one sub-server, based on the analysis time and a number of processing layers for curve wavelet package decomposition, a wavelet package analysis is performed on the voltage disturbance curve, to acquire a wavelet decomposition coefficient of each layer corresponding to the voltage disturbance curve. For the one of the at least one sub-server, according to the wavelet decomposition coefficient of each layer corresponding to the voltage disturbance curve, a characteristic value of each layer is determined. For the one of the at least one sub-server, according to the characteristic value and a characteristic threshold of each layer corresponding to the voltage disturbance curve, a voltage stability analysis result of the node is determined.

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.

A power conversion device, a method for determining a connection state of a power conversion device, a component controller, and a system are provided. The power conversion device includes: a DC input terminal and a control module. The DC input terminal is configured to be connected to a photovoltaic component through a component controller. The control module is configured to: transmit a voltage regulation instruction to the component controller; monitor an input terminal voltage of the DC input terminal connected to the component controller, where the voltage regulation instruction is used for indicating the component controller to regulate an output voltage based on the predetermined voltage change strategy; compare a measured voltage change of the input terminal voltage with a predetermined voltage change strategy; and determine a connection state between the DC input terminal and the component controller based on a comparison result. Therefore, it can be determined conveniently whether the DC side of the power conversion device and the component controller are open circuited.

When determining that receiving of a heartbeat signal is continuously interrupted from a first time point to a second time point, a module-level power electronics (MLPE) device considers that signal receiving is abnormal. If it is determined that an output current is less than a current threshold, it indicates that the MLPE device is in a scenario in which safe shutdown is required, and an output voltage is controlled to be less than a voltage threshold or output power is controlled to be less than a power threshold. If it is determined that the output current is greater than or equal to the current threshold, the output voltage is controlled to be greater than or equal to the voltage threshold or the output power is controlled to be greater than or equal to the power threshold from the second time point to a third time point.

The application discloses a high-voltage cascaded grid-connection energy storage system fault power unit energy rebalancing control method, and belongs to the technical field of power electronics and energy storage systems; and aims to solve problems such as the fact that residual energy cannot be recovered after a bypass of a fault power unit, voltage imbalance of healthy units and overcurrent impact caused by a rebalancing process. The method builds a multi-dimensional state-aware dynamic feasible region model, combines weight optimization distribution, phase smooth transition and multi-stage rate control, realizes efficient and smooth transfer of residual energy under the premise of guaranteeing system safety and grid-connection stability, and significantly improves available capacity, voltage quality and dynamic stability of the system under a fault condition.

The application provides a capacitor-assisted off-grid commutation converter and a control method and device thereof and system, and relates to the technical field of high-voltage direct current transmission.The capacitor-assisted off-grid commutation converter provided by the application comprises a main circuit, at least one upper bridge arm circuit and at least one lower bridge arm circuit; an auxiliary circuit, at least one upper bridge transfer circuit, one upper bridge off-grid circuit, one upper bridge energy storage circuit, at least one upper bridge pumping circuit, at least one lower bridge transfer circuit, one lower bridge off-grid circuit, one lower bridge energy storage circuit and at least one lower bridge pumping circuit.The application can inhibit the occurrence of commutation failure and improve the reliability of high-voltage direct current transmission.

This invention discloses a control method for an energy storage inverter coupled to a diesel generator, including a harmonic suppression step, a reactive power compensation step, and a bus adjustment step. The harmonic suppression step includes: dynamically adjusting the proportional control parameters of the current loop control based on the diesel generator voltage, and introducing a filtering module in the feedforward signal processing. The reactive power compensation step includes: actively outputting reactive power compensation based on load characteristics to offset the influence of capacitive loads on the diesel generator power factor. The bus adjustment step includes: real-time detection of whether the AC side voltage exhibits characteristics of the diesel generator; if so, adjusting the bus reference voltage value to a safe range close to the overvoltage protection value. This invention's control method for an energy storage inverter coupled to a diesel generator improves the adaptability of the energy storage inverter to different diesel generators.

The present invention pertains to a power electronic converter, such as an inverter or converter, for an electric application such as a motor drive, electrolyzer or charger. The power electronic converter includes a DC link and an active front end (AFE) connected to grid via a filter and a grid board with a first inrush relay with a resistive device. The resistive device may be a resistor, more specifically an NTC resistor or a PTC thermistor. The grid board further includes a second inrush relay, wherein at least one of the inrush relays is controlled to engage or disengage during startup phase of the power electronic converter and during abnormal grid voltage conditions, such that the DC link is charged via the resistive device or by bypassing the resistive device, and such that the AFE is provided for boosting the DC link voltage to a save level and under controlled conditions. The invention also pertains to an electric motor drive according and a method for operating a power electronic converter.

A power plant having a plurality of DC battery energy storage system (BESS) modules is disclosed, with each BESS module having a dually attached node (DAN); a plant controller; and a communication network. The communication network is linked between the plurality of BESS modules and the plant controller. The communication network includes a redundant local area network (LAN) arranged with a first LAN and a second LAN. The DAN of each of the plurality of BESS modules is in communication with the plant controller via the first LAN and via the second LAN. The communication network executes a parallel redundancy protocol (PRP) to effect communication between the plant controller and the plurality of BESS modules via the first and second LANs and the DAN.

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 application provides a power failure detection method, including: obtaining a first fundamental wave signal of an alternating current (AC) at a first moment and a second fundamental wave signal at a second moment, where the second moment differs from the first moment by N sampling periods, and N is a positive integer; then obtaining a target signal orthogonal to the first fundamental wave signal based on the first fundamental wave signal and the second fundamental wave signal; quickly obtaining a real-time voltage amplitude of the AC at the first moment based on the first fundamental wave signal and the target signal; and determining a power failure detection result of the AC based on the real-time voltage amplitude.

The present invention relates to a method for fault level monitoring in an electrical power system electrically connectable to a capacitor bank, the method comprising: causing (S102) a switching operation for electrically connecting the capacitor bank to the electric power system, measuring (S104) an electric characteristic caused by the switching operation at the capacitor bank, and determining (S106) a fault level in the electric power system based on the electric characteristic.

A method for operating a controller in a fault managed power (FMP) system, includes connecting the FMP front-end circuit of the controller electrically in parallel with the FMP transmission line, receiving power by the FMP front-end circuit and the output control and conditioning circuit of the controller from the FMP transmission line when the FMP transmitter transmits power over the transmission line during power transfer periods, in the low power and the high-power modes. It includes electrically isolating the output control and conditioning circuit from the FMP front-end circuit and the FMP transmission line during power sample periods and it causes the controller to perform one or more of receiving input data from a human operator, receiving sensor data from a sensor, presenting output data for the human operator to observe, or transmitting data to and receiving data from the FMP transmitter.

The application provides a coupling power system stability control strategy collaborative control method, device, equipment and readable storage medium, which can be used for a stability control master station of a power system, especially a wide-area collaborative stability control master station. When multiple coupling stability control strategies exist in the power system, such as a stability control strategy triggered locally by the power system and a strategy for processing a remote control command simultaneously or sequentially exporting an action command in a short time and acting on the same group of controlled objects, the collaborative control of the multiple stability control strategies can be realized through a coordination mechanism independent of the stability control strategies, without changing the related strategies or changing other strategies after the partial strategies are updated, so as to reduce the under-tripping and over-tripping risks of the stability control master station of the power system when the coupling strategies exist, reduce the design difficulty of the stability control strategy collaborative control, reduce the mutual influence of the strategy and device updating, effectively realize that the total control amount result is controlled reasonably, and neither cause over-control nor cause loss of control, which harms the stability of the power system.

The application provides a flexible direct current converter station branch control voltage switching method, device and medium. The flexible direct current converter station comprises a converter transformer, a flexible direct current converter valve and a flexible direct current branch, the flexible direct current branch is connected between the flexible direct current converter valve and the converter transformer, and comprises at least one branch connected in parallel. When the flexible direct current converter station is running, the method comprises the following steps: determining the conduction state of each branch; and determining the voltage of the branch with a normal conduction state as a control voltage only when the conduction state of one branch is normal.

The application discloses an energy scheduling method and system for energy storage cabinets in multi-scene grid connection, relates to the technical field of energy storage cabinet energy scheduling, and aims to improve the safety and operation efficiency of the energy storage cabinet in a complex network environment, establishes a trusted communication foundation through a hardware trust root holding mechanism, ensures the authenticity of the equipment identity, adopts safe channel transmission and a distributed log account book to guarantee the traceability of instructions, introduces an instruction credibility evaluation mechanism to judge the reliability of the instructions in real time, effectively suppresses the risks on the network side and the physical side, dynamically optimizes power output through a fine scheduling strategy, balances power grid demand and equipment safety, and in the case of abnormal conditions, implements capacity reduction operation and abnormal record to improve the fault tolerance and traceability of the system. Through the synergistic effect of the multi-level technical features, the safety and stability of the energy storage cabinet in multi-scene grid connection are improved, and a solid guarantee is provided for the reliable operation of the power grid.

The application discloses a transient quantity protection starting method and device, a readable storage medium and an electronic equipment. The transient quantity protection starting method comprises the following steps: acquiring sampling data, wherein the sampling data is obtained by performing high-pass filtering and high-frequency sampling processing on a transient quantity in a protected power system; calculating a first starting quantity average value change quantity sequence and a second starting quantity variance sequence based on the sampling data; determining that any first starting quantity average value change quantity in the first starting quantity average value change quantity sequence is greater than a first threshold value; determining that a second starting quantity variance before a preset time of the first starting quantity average value change quantity is less than a second threshold value; and starting the transient quantity protection.

The present disclosure relates to a method (100) for operating a wind turbine (10) during a grid event. The wind turbine (10) comprises a generator (42) and a power converter (61), which includes a generator side converter (63), a grid side converter (65), a DC-link, and an energy dissipating unit (69). The method (100) comprises detecting the grid event. The method (100) also comprises reducing a power of the generator (42) and reducing a power injected into the grid (95) in response to the grid event. Furthermore, an end of the grid event is detected and a power injected into the grid (95) is increased with a first rate (204). The method also comprises increasing the power generated by the generator (42) in response to a difference between the power generated by the generator (42) and the power injected into the grid (95) reaching a threshold (203). The present disclosure also relates to the corresponding wind turbine (10).

The present disclosure relates to systems and methods for utilizing second-life electric vehicle (EV) batteries as part of a battery energy storage system. In particular, in one or more embodiments, the disclosed systems provide a battery control system that enables use of multiple different types of batteries from different manufacturers and with different chemistries. For example, a site controller oversees system operation by receiving battery-status data from the various battery-management systems, directing inverter blocks to manage power flow among the battery packs, and routing energy to the appropriate loads. At the battery pack level, a pack manager device communicates with individual battery packs from different manufacturers, converts the battery-specific voltage into a standardized direct-current bus level, and regulates battery pack behavior based on reported operating parameters to maintain safe, reliable performance. By so doing, one or more embodiments provide for secondary use of used or partially degraded batteries.

The application discloses a kind of optimal load carrying capacity evaluation method of distribution network considering load response and development, which comprises the following steps: S1, the influence of demand response on load curve and power supply reliability under normal / fault two kinds of scenarios is considered, and a load carrying capacity interval model is constructed;S2, considering the uncertainty of load development, a load carrying capacity optimization model with economic optimization as the target is constructed;S3, the outer model is solved by genetic algorithm, to improve the solving speed, a linearization processing method based on the inner model of large M method is proposed and solved by CPLEX, so as to obtain the optimal load carrying capacity of distribution network and the corresponding demand response strategy.The application provides a solid support for the judgment and determination of distribution network planning scheme.

The invention relates to a power electronic converter, such as an inverter or converter, for electrical applications, such as motor drives, electrolyzers or chargers. The power electronic converter includes a DC link and an active front end (AFE) connected to a grid via a filter and a grid plate. The grid plate has a first surge relay. The first surge relay has a resistive device. The resistive device may be a resistor, more specifically an NTC resistor or a PTC thermistor. The power grid plate further comprises a second surge relay. During a start-up phase of the power electronic converter and during abnormal grid voltage conditions, the at least one surge relay is controlled to turn on or off such that the DC link is charged via or bypassing the resistive device, and the AFE is used to boost the voltage of the DC link to a safety level and in a controlled condition. The invention also relates to an electric motor drive and to a method for operating a power electronic converter.

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.

Embodiments of the present disclosure disclose a virtual power plant power coordination control method and device based on multi-source data. A specific embodiment of the method comprises: based on the physical resources corresponding to the multi-source data, constructing corresponding virtual resource models in the virtual power plant; determining power adjustment range information and power change information using a preset device physical property response model; determining corresponding power response characteristic information based on the power change information; performing power power control processing on the power response characteristic information based on the power adjustment range information to obtain a set of coordination control instructions; for each coordination control instruction in the set of coordination control instructions: distributing the coordination control instruction to the corresponding edge control device to perform security verification to obtain a verification result; and executing the coordination control instruction to control the target power device. This embodiment can improve the rationality of power distribution, enhance the stability of the power grid, and reduce the risk of device overload.

During live operation of the controller (31), performance of the decision logic (35) of the controller (31) of the industrial automation control system is monitored. The monitoring system (20) receives operational data collected during live operation of the controller (31). The monitoring system analyzes the operational data using pre-operation data generated prior to live operation of the controller (31) and / or performance evaluation logic (27) generated prior to live operation of the controller (31) to evaluate performance of the decision logic (35). The monitoring system (20) generates an analysis output based on the analysis results.

Embodiments of the present application disclose a power system startup recovery path determination method, device, equipment and medium. The power system startup recovery path determination method can specifically include: determining an infected node in a to-be-started system and at least two to-be-infected load nodes; determining at least two candidate load recovery paths of the to-be-started system according to the infected node and each to-be-infected load node; determining a power fluctuation value of each candidate load recovery path, and determining an optimal recovery path of the to-be-started system according to each power fluctuation value. The technical scheme of the embodiments of the present application can quickly and accurately determine the optimal recovery path, thereby shortening the startup recovery time of the power system and reducing economic losses.

The application discloses a bridge arm current distribution method and system for reducing M3C bridge arm current peak value, comprising the following steps: constructing a current distribution model based on the relationship between the power frequency side line current, the frequency division side line current and the bridge arm current; optimizing the current distribution model based on the concept of sub-converter upper limit current; obtaining the selection principle of positive sequence current distribution coefficient based on the optimized current distribution model; proposing a solving method of the positive sequence current distribution coefficient with the minimum sub-converter upper limit current as the target based on the selection principle of the positive sequence current distribution coefficient; designing the solving process of the positive sequence current distribution coefficient in actual application based on the solving method of the positive sequence current distribution coefficient with the minimum sub-converter upper limit current as the target, obtaining the positive sequence current distribution coefficient, and determining the distribution scheme of each bridge arm current. The application can effectively reduce the bridge arm current peak value, significantly improve the overload capacity of the M3C converter station, reduce the investment and construction cost of the M3C converter station, and improve the economy of the whole system.

The present disclosure relates to systems and methods for utilizing second-life electric vehicle (EV) batteries as part of a battery energy storage system. In particular, in one or more embodiments, the disclosed systems provide a battery control system that enables use of multiple different types of batteries from different manufacturers and with different chemistries. For example, a site controller oversees system operation by receiving battery-status data from the various battery-management systems, directing inverter blocks to manage power flow among the battery packs, and routing energy to the appropriate loads. At the battery pack level, a pack manager device communicates with individual battery packs from different manufacturers, converts the battery-specific voltage into a standardized direct-current bus level, and regulates battery pack behavior based on reported operating parameters to maintain safe, reliable performance. By so doing, one or more embodiments provide for secondary use of used or partially degraded batteries.