16 results about "Power system restoration" patented technology

The invention belongs to the technical field of power system recovery control, and discloses a power coordination control method of a hybrid energy storage auxiliary black-start system and a related device.According to the method, the total active power requirement of the black-start system is obtained and decomposed into three time scale components of fundamental waves, intermediate frequencies and high frequencies; the power is dynamically distributed to the lithium battery and the super capacitor, the distributed power is corrected based on the temperature, the operation time and the rated parameters, and finally the frequency change rate and the direct-current voltage change rate are calculated according to the actual power instruction and the system parameters so that the controller can output the control quantity. By adopting the method, the contradiction between the energy and the power density of a single power supply is overcome, the response speed and the continuous power supply capability are synergistically improved, the voltage frequency instability risk caused by load input is effectively inhibited, and the reliability and the high efficiency of black start are remarkably improved by perfecting hybrid energy storage coordination control.

The invention relates to the field of power system recovery, and discloses a black-start path optimization method, which comprises the following steps of: recursively searching an initial path meeting all preset constraint conditions by taking a black-start power supply as an initial node through a backtracking algorithm to realize full-path traversal so as to avoid missing a potential optimal solution; a graph tensor is constructed based on node comprehensive feature data and edge connection feature data, a time sequence tensor is constructed in combination with dynamic time sequence data, spatial-temporal feature expression of a path is formed, a pre-trained hybrid neural network model is utilized to quickly evaluate a path comprehensive score, a candidate path with the highest score is screened out, and the path comprehensive score is evaluated. And finally, the candidate path is accurately verified through electromagnetic transient simulation, and an optimal path is determined. According to the method, path feasibility constraints are strictly considered, online path adjustment is supported to cope with dynamic changes such as energy storage attenuation, robustness is achieved, path evaluation is accelerated through the hybrid neural network, the simulation verification frequency is greatly reduced, and the search efficiency is remarkably improved.

The invention relates to the technical field of power system recovery control, in particular to a power grid black-start system and method based on cascade hydroelectric characteristics, and the method comprises the steps: constructing a software and hardware integrated system integrating physical equipment and intelligent control; situation awareness is carried out through the software and hardware integrated system, a power failure range after large-area power failure of a power grid is automatically identified, available cascade hydropower stations are positioned, and a black start plan is automatically triggered; the central decision-making unit simultaneously instructs a plurality of upstream hydropower stations to start units according to a preset rule so as to establish a plurality of independent power islands; after the frequency and voltage of each power island are stabilized, power is supplied to a next-stage transformer substation or power station in parallel, and partition collaborative recovery is carried out; dynamically distributing a load to be recovered, and performing synchronous parallel operation by using real-time phase angle difference data provided by a synchronous phasor measurement unit (PMU); and carrying out synchronous parallel operation on a plurality of subsystems which are stably operated, and gradually expanding a power grid architecture.

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.

The invention relates to the technical field of power system stability control, and provides a new energy black-start partition optimization method considering unconventional risks, which comprises the following steps: simulating unconventional risks possibly encountered by a power system by adopting Monte Carlo sampling; extracting the output characteristics of wind power under the unconventional risk by adopting variational mode decomposition, and performing output prediction in combination with a long-short-term memory neural network; a power system recovery partition is divided based on an LPA algorithm, and the LPA algorithm is improved by considering a partition size balance principle, so that the partition area is more balanced, and the tag oscillation effect is reduced. According to the method, the black-start partition optimization model fusing new energy output uncertainty modeling and unconventional risk scene generation is designed, and the partition scheme is cooperatively solved by adopting the improved label propagation algorithm, so that the robustness and the recovery efficiency of the black-start partition are effectively improved; and rapid and stable power supply of a power system under complex disturbance can be realized.

The invention provides a power system transient voltage control method and system. The method comprises the following steps: acquiring initial power system operation state parameters in real time and establishing a transient model; obtaining an initial transient voltage severity index based on the parameters and a preset initial voltage; constructing a physical information neural network based on the transient model and exporting a loss function of the physical information neural network; based on the parameters, a preset reward parameter and a noise network, obtaining an initial Rainbow agent, executing a removal action and calculating corresponding loss; and constructing a total loss function based on the total loss function and training to convergence by taking minimization as a target, and obtaining an intelligent agent to realize the control of the transient voltage of the power system. According to the method and the system for controlling the transient voltage of the electric power system, the electric power system can be rapidly controlled to recover stability, the situation that the transient voltage control decision is not accurate due to the fact that the action value is excessively estimated is avoided, and the situation that the instability degree of the electric power system is aggravated is further prevented.

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.

The application provides a partition method, device and equipment for power system outage recovery and a storage medium. The method comprises the following steps: determining a guarantee area based on the number and capacity of black-start power sources and the starting power of to-be-recovered conventional units and the node load power; including nodes and branches based on the rated power of the to-be-recovered conventional units in the guarantee area to obtain a feasible area; and determining the partition attribution of a new energy station based on the support power provided by the new energy station and the new energy consumption capacity of each partition in the feasible area to obtain an expanded area. The method can improve the execution efficiency of the power system recovery scheme.

The utility model discloses an automatic power system recovery device which comprises an installation frame, a fixing assembly is installed on the back face of the installation frame, a first insulation pad is laid in the installation frame, and a first connecting assembly and two second connecting assemblies are installed on the front face of the first insulation pad respectively. A mounting assembly is mounted on the front face of the mounting frame, a lifting assembly is mounted in the mounting assembly, and the first connecting assembly comprises a first conductive plate and a first wiring cylinder. The lifting assembly installed in the device can drive the two conductive clamping plates to descend respectively, so that one conductive clamping plate is connected with one first connecting clamping piece and one second connecting clamping piece, and the two second connecting assemblies can be connected with the first connecting assembly. Therefore, switching between the normal power supply and the standby power supply is facilitated, and the problem that the standby power supply is inconvenient to switch by an existing device is effectively solved through the device.

The invention provides an electric power system recovery stochastic optimization method and system considering network construction type energy storage auxiliary black start, and the method comprises the steps: constructing a network construction type energy storage mathematical optimization model for a power grid recovery process based on discrete time steps; embedding the network construction type energy storage mathematical optimization model into a black-start power system recovery stochastic optimization model, wherein the optimization target of the power system recovery stochastic optimization model is that the sum of the full-time recovery load power, the recovered rated power of the thermal power generating unit and the output of the new energy unit in each time step reaches the maximum; and outputting a recovery strategy through the power system recovery stochastic optimization model, and recovering the black-start power system. The method provided by the invention can improve early-stage network formation capability and frequency and voltage stability margin, increase available load and accelerate a recovery process, and is suitable for black start recovery of a high-proportion new energy power system.

The invention discloses a power grid partition parallel recovery two-stage optimization method considering multi-source cooperation, and relates to the technical field of power system recovery. The method comprises the following steps: providing basic conditions for the new energy power generation system to participate in black start, and determining the number and type of black start power supplies; constructing a power grid partition optimization model based on a network flow theory in a first stage; and establishing a power grid partition parallel recovery optimization model considering multi-source cooperation in a second stage, and realizing rapid recovery of the power system taking the wind-light-water-storage multi-source cooperation as the black-start power supply. According to the invention, complete recovery of each generator set, power transmission line and power load in a power-off power grid can be realized, and the problems of long recovery process and important load recovery failure possibly caused by a serial recovery strategy are effectively solved. Meanwhile, the invention provides a power grid partition parallel recovery optimization model taking wind-light-water-storage multi-source cooperation as a black-start power supply, and the problem of insufficient black-start resources possibly existing in a local power grid is effectively solved.

The invention discloses a double-layer coordinated power system recovery method and system based on multiple flexible resources. The method comprises the following steps: acquiring basic parameters of a target power system and setting a line recovery rate; solving the upper-layer topology reconstruction model to obtain a generator starting sequence and a skeleton network reconstruction scheme containing a bus connection state; solving the lower-layer flexible resource scheduling model to obtain a load recovery amount and flexible resource scheduling power controlled by a corresponding bus connection state; performing joint solution on the double-layer model by combining a global active power balance equation to obtain a preliminary recovery scheme; and performing physical security verification on the preliminary scheme, and if the verification is not passed, constructing an integer cutting constraint and feeding back the integer cutting constraint to the joint solution for iteration until a final recovery scheme is output. According to the method, strong coupling cooperative scheduling of grid reconstruction and multi-type flexible resources is realized, and the feasibility of global optimization and real power grid landing under extreme disasters is ensured through physical verification and a mutual exclusion constraint iteration mechanism.

The invention discloses a power grid black-start path optimization method and system, and belongs to the technical field of power system recovery control, and the method comprises the steps: obtaining power prediction data based on the inherent uncertainty of the output power of a new energy station; constructing a black-start path optimization model according to the power prediction data; according to the power grid black-start path optimization method and system, a traditional A star algorithm is improved by introducing the weight coefficient, the path smoothing strategy and other strategies, and a black-start path optimization strategy with higher applicability is provided for a novel power system after new energy is accessed. The stability of the power grid in the black-start recovery process is ensured, and the problem that a traditional black-start path optimization algorithm cannot fully consider new energy output characteristics is solved.

The invention relates to the technical field of power system recovery and operation control, and particularly provides a thermal power generating unit black-start method based on an electric vehicle V2G technology, and the method comprises the steps: obtaining the V2G real-time resource state of each charging station in a to-be-recovered region of a power grid, and carrying out the local integration and evaluation, and obtaining the overall usable discharge resource of each charging station; collecting the total available discharge resource information of each charging station to form a regional V2G cluster, and performing safety check on the regional V2G cluster based on the black start load curve of the target thermal power generating unit; after the security check is passed, generating a black-start execution scheme, and constructing an island microgrid powered by a V2G cluster; and the V2G cluster is controlled to be divided into two stages to recover station power for the thermal power generating unit, and the V2G cluster is smoothly quitted after the unit is started. According to the scheme, a dynamic and reliable black-start power supply is formed by integrating the V2G capacity of a large-scale electric vehicle, and initial power and auxiliary power are provided for a thermal power generating unit, so that the recovery process of a power grid is accelerated, and the toughness and reliability of the power grid are improved.

The present application belongs to the technical field of power system restoration control, and discloses a power coordination control method of a hybrid energy storage auxiliary black start system and related devices. The method obtains the total active power demand of the black start system, decomposes it into three time scale components of fundamental wave, medium frequency and high frequency, dynamically allocates it to lithium batteries and super capacitors, and then corrects the allocated power based on temperature, operation time and rated parameters. Finally, the frequency change rate and the DC voltage change rate are calculated according to the actual power instruction and the system parameters, and the controller outputs the control quantity. The method overcomes the contradiction between the energy and the power density of a single power source, cooperatively improves the response speed and the continuous power supply capacity, effectively suppresses the voltage frequency instability risk caused by the load input, and significantly improves the reliability and efficiency of the black start through the improved hybrid energy storage coordination control.

The invention provides a protection system and method for a standby power device and a wind generating set. The protection system of the standby power device comprises the standby power device which comprises a battery; a power conversion module connected to the standby power device via a first switch and connected to an external power supply via a second switch; the voltage sensor is used for detecting the voltage of the standby power device; and the controller is used for receiving the voltage signal output by the voltage sensor and controlling the first switch and the second switch to be switched on and switched off. When the power conversion module stops output, the standby power device is disconnected from the electric equipment to protect the standby power device, and when the main power system recovers power supply, the standby power device is automatically charged to prolong the service life of the standby power device. In addition, the charging state of the standby power device is monitored, so that reliable operation of the power system is improved, and the standby power device is protected.