57 results about "Power system computation" patented technology

According to one aspect, an apparatus for computing a solution to a power flow problem for an electrical power system comprising a plurality of buses. The apparatus includes (a) at least one processor comprising a plurality of cores; and (b) memory coupled to the at least one processor for storing an admittance matrix for the power system, real power and reactive power for each bus, and an initial complex voltage for each bus; (c) wherein the at least one processor is configured to: (i) perform a Jacobi power flow calculation for each bus to determine the complex voltage for each bus, the Jacobi power flow calculation using the admittance matrix, the real power and reactive power for each bus, and the initial complex voltage for each bus as inputs, wherein at least two Jacobi power flow calculations are performed concurrently on the plurality of cores; (ii) calculate a power mismatch at each bus based on the complex voltages; and (iii) determine whether the Jacobi power flow calculations have converged based on the power mismatch and repeat (i) to (iii) if the Jacobi power flow calculations have not converged.

The invention relates to a power station automation system data network security monitoring method. An Snort detecting engine is utilized to realize the monitoring for a power station automation system data network on a traditional electric power system computer network system, an inserted rule of the engine comprises communication rules including CDT, IEC-60870-101 and IEC-61850, and the frame format of the rule is utilized to establish an engine matched condition; the monitoring for network security is realized through the following two modes: a. monitoring the data frame content transmitted on the work, using a rule format transmitted by power station data as a reference, permitting the information satisfying the rule format to continuously circulate, and isolating the information unsatisfying the rule format; b. monitoring the real-time flow of a power station data acquisition network, and if finding abnormal network flows, then indicating that abnormal data is transferred, and giving warning information by a power station automation system data network security monitoring device.

The invention discloses a planning method and system applicable to an ultrahigh-voltage DC external transmission power grid containing high-permeability new energy. The planning method comprises the steps of performing simulation data building by a power system calculation analysis system according to information of a sending-end power grid and information of a plurality of new energy plant stations; performing power current balancing calculation on each division region of the sending-end power grid, and determining an alternative region of a sending-end DC drop point; determining at least onesending-end power grid ultrahigh-voltage DC drop point and a corresponding connection planning scheme; building a typical running mode of the sending-end power grid according to new energy output characteristic; estimating safe stability of a sending-end AC-DC hybrid power grid under a running mode of the sending-end power grid with regard to each connection planning scheme, judging whether (N-1)fault criterion is conformed or not; analyzing and improving the connection planning scheme which does not conform to the (N-1) fault criterion; and performing multi-angle comprehensive estimation oneach connection planning scheme, and determining optimal power grid planning scheme according to an evaluation result.

The invention belongs to the technical field of the calculation and analysis of a power system, and discloses a method for comprehensively evaluating the precision of stability calculation models and parameters based on PMU data. The method comprises the following steps: performing time-domain simulation on an electromechanical transient process and an electromechanical dynamic process for the disturbance of a power grid, and adopting a power system security and stability quantitative analyzing method to calculate transient security and stability margins, modes, dynamic oscillation damping ratio and frequency; (2) adopting PMU actually-measured data on the power angle and frequency of a generator and the voltage and frequency of a busbar after the disturbance of the power grid to take place of time-domain simulation results of corresponding physical quantities, and then adopting the power system security and stability quantitative analyzing method to calculate the transient security and stability margins, the modes, the dynamic oscillation damping ratio and the frequency; and (3) comprehensively evaluating the precision of transient and dynamic security and stability calculation models and the parameters by comparing differences between the two transient and dynamic security and stability margins and the modes. Through the method, reliability evaluation on the transient and dynamic security and stability simulation calculation results of the power system is realized.

The invention belongs to the technical field of power system computation and analysis. The method is mainly characterized by comprising the following steps: 1) confirming subnets of checking, analysis and computation of low-frequency deloading parameters according to the power grid real-time operation mode information by combining the configuration and start and stoppage situation of a low-frequency deloading device, and automatically generating a forecast failure collection for the checking, analysis and computation for the low-frequency deloading parameters; 2) computing the low-frequency deloading parameters of each subnet online according to the actual situation of the low-frequency deloading control load; 3) generating a tidal current for low-frequency deloading checking, analysis and computation online according to the power grid real-time operation mode, and carrying out time and domain simulation for different expected stoppage and subnets by adopting the differentiated low-frequency deloading parameters consistent with the actual situation; and 4) analyzing and computing the frequency safety margin based on time and domain simulation, and taking the requirement met by the frequency safety margin as the basis for evaluating that the low-frequency deloading parameters adapt to the current operation mode.

The invention belongs to the power system calculating and analysis technology field, and is applicable to calculate limit powers of associated electricity transmission cross-sections considering static, transient and dynamic security and stability constraints. The limit power calculating method of associated electricity transmission cross-section based on parallel calculating model comprises the steps of firstly calculating a static security limit, and then calculating security and stability limits of the transient and dynamic, on the basis of estimating the power increasing amount of each cross-sections considering over loading security of equipment; classifying the power increasing space of each cross-sections in turn according to the examined failure number and the example calculating capability of a parallel processing platform, and carrying out security and stability calculations for the run modes of different electricity transmission power combinations of each cross-sections by parallel example; judging whether to carry out security and stability calculations of the next round according to the precision requirement of limit calculation after all examples of the round being calculated, and filtering the examined failure set before each round of calculation; and finally, calculating mutual influence factors between limit powers of each cross-sections by analyzing the limitcalculation process information.

There is provided an information processing device including an acquisition unit that acquires power supply request information that includes information on a supply period during which an electric power system is requesting supply of electric power, and reservation information for a vehicle, a calculation unit that, on the basis of the reservation information, calculates supply power to be supplied to the electric power system from the vehicle during the supply period, and a notification unit that notifies the electric power system of the calculated supply power.

The invention provides a robust state estimation method based on a piecewise linearity weight factor function and belongs to the technical field of power system computation. The method includes the steps of step 1, establishing a robust state estimation model based on the weight factor function, step 2, selecting and measuring a weight factor function equation and determining and measuring equivalent weight factors, and step 3, solving the variable weight factor robust state estimation model, and obtaining and outputting estimation results. Aiming at section difference of traditional weight least square estimation on bad data identification, the robust state estimation method based on the piecewise linearity weight factor function is proposed, a weight least square estimation method and the robust estimation principle are combined, therefore, computation efficiency and quickness of the weight least square estimation are reserved, and also the state estimation algorithm has high robust performance.

The invention belongs to the technical field of power system computation and analysis and is applied to generating a typical fault set for transient stability analysis of a power system. The method comprises the following steps of: firstly, for the same power grid operation mode, performing the transient stability evaluation on different faults respectively by adopting a transient stability quantitative evaluation method to obtain a stability mode of each fault; secondly, calculating a transient stability association degree index between different faults according to a constitutive relation between the participation factor of the same generators in the transient stability critical generator set of every two faults and the participation factor of all the generators in the critical generator set; and finally, screening all the faults according to the transient stability association degree index between the faults. Therefore, the typical fault set for the transient stability analysis of the power system is obtained.

The invention provides an on-line static security analysis method based on topological comparison, and belongs to the technical field of computing of a power system. On the basis that the topological structure of a section is not changed, a factor table under a ground state section and inverse matrix information used in quick fault filtration for direct current tide are fully used; and under the condition that the topological structure of the section is changed, the factor table is corrected through partial topological analysis and a partial factor correction technology, and the on-line static security analysis method is provided on this basis. By the on-line static security analysis method, the static security analysis computing speed is increased; based on the change characteristic of the topological structure of an on-line system, on-line static security analysis is performed by fully using a measure combining topological comparison, process value reuse and partial topological analysis; the load rate of a computing server is reduced; and the scanning speed of the current section and a reusable section is increased.

The invention relates to an identifying method of distribution parameter of a transmission line. The method comprises the following steps: calculating a positive-sequence component and a zero-sequence component for a transmission line with external faults by collecting electric signal momentary values at the head and tail ends; and calculating positive-sequence distribution parameters: a resistor R1, an inducer L1 and a capacitor C1; then, calculating zero-sequence distribution parameters: a resistor R0, an inducer L0 and a capacitor C0. According to the invention, the line distribution parameters can be solved just by collecting voltage and current synchronous momentary values at both ends without the necessity to master parameters on both sides and operational states of other parts. The identifying precision of the method is not affected by fault condition, and the method has the advantages of simpleness and convenience in operation, and accurate calculation, and provides accurate line parameters for the power grid so as to ensure the reliability of calculation results of subsequent power system calculation such as state estimation, load flow calculation, fault location, and protection relay setting.

The invention belongs to the field of power system computers. The method is a malicious domain name infected host tracing method. The method comprises: establishing a database on a platform, collecting DNS server logs, anti-virus searching and killing logs, virus access URL feature information, a disposal knowledge base and IP address division information of all associated hosts in a power grid system on a platform; establishing a virus feature table according to the collected virus access URL feature information, establishing a processing suggestion table according to a processing knowledge base, and storing IP address division information; and obtaining a DNS server log from a host, analyzing and normalizing the DNS server log through comparative analysis, then performing feature comparison with the virus feature table, generating an alarm according to suggestions corresponding to virus features compared in the virus feature table in the processing suggestion table, and then enteringa processing flow. According to the invention, the attacked host is disposed in time according to the disposal suggestions, thereby achieving the purposes of ensuring the security of the informationintranet and reducing the security threat.

The application belongs to the computer calculation field of an electrical power system, and discloses a power grid black-start assistant decision-making system. The black-start assistant decision-making system includes three parts of a pattern platform, a database, and an algorithm analysis library. The pattern platform is formed by a picture browser of a smart power grid dispatching technical support system and a self-developed window. The database stores each element parameter in the electrical power system and analysis results, which is convenient for user modification and checkup. The algorithm analysis library includes a numerical analysis algorithm and an optimization algorithm used in a black-start process. The algorithm analysis library is a technology core of the whole system. The black-start assistant decision-making system based on the DTS is characterized in that the system adopts a modular hierarchical structure including a data layer, an application layer, an application support layer, an interface layer and a user layer. According to the invention, the black-start assistance decision-making system and the DTS based on a D5000 smart power grid dispatching technical support system are integrated together, share a real-time power grid database, a data communication platform, and power grid pictures.

The invention relates to a simulation method of a main servomotor of a speed governor of a hydraulic turbine, and solves the technical problems that in the existing electric system calculation, the adopted simulation method of the main servomotor of the speed governor of the hydraulic turbine has poor veracity and big error when frequency fluctuation is large. The method includes an amplifying step, a servomotor speed amplitude limiting step and an integration amplitude limiting step, wherein, the amplifying step is that the amplification of an input signal is carried out and a relative speed of a follow-up system is obtained, the servomotor speed amplitude limiting step is that speed limiting to the main servomotor is carried out, and the integration amplitude limiting step is that the relative speed of the main servomotor is integrated and a relative displacement value of the main servomotor is obtained, and then the limiting to the displacement of the main servomotor is carried out according to the relative displacement value. The method can theoretically explain the operation process of every step of the main servomotor and every step and parameters have clear physical meanings; every parameter can be determined by practical measurement or parameter identification; the method has the advantages of being capable of simulating primary frequency modulation, the increase and decrease of load and large fluctuation modulation with higher precision degree.

The invention relates to an online model parameter collection method based on a process cross-region power grid running method. According to the method, uniform coordinated management of a running state model and a planning state model is achieved, the running method process maintenance function is achieved, the calculation model cross-region maintenance mechanism is achieved so that data can be maintained in a classified mode and the network can be shared by provinces and cities at all levers, and the interaction function of an online calculation model and a traditional offline calculation model is achieved. The method has the advantages that calculation data are centralized, unified, accurate, reasonable, safe and standard, calculation data are maintained in a classified mode, a strict model parameter management procedure is achieved so that work can be efficient and data can be shared, the requirement for offline analysis and the requirement for online application are simultaneously met, the problems that current devices used for power grid offline power system calculation and analysis and online application platforms are dispersed and disorder in parameter management, uncertain in data source and poor in data uniqueness and reliability are solved, and unified management is achieved for offline data and online calculation data.

The invention discloses a power system transient stability simulation method based on network node numbering optimization. A sparse vector technology is widely applied to power system calculation. However, existing network node numbering methods applied to sparse vectors aim to achieve the purpose that the average forward and backward substitution calculation amount of all nodes is the smallest, and the characteristic that forward and backward substitution only needs to be conducted on active nodes during transient stability simulation is not taken into consideration. According to the power system transient stability simulation method, the characteristic that the sparse structure of an independent vector of a network algebraic equation and the sparser structure of a solution vector are identical and decided during transient stability simulation is fully considered, the network nodes are divided into active nodes and passive nodes, the out-degrees of the nodes, the number of active precursor nodes and the number of the precursor nodes are fully considered, the network nodes are numbered, under the condition that the number of newly increased elements of a factor table is small, the average path length of the active nodes is made the smallest, and no requirement for the path tree lengths of the passive nodes exists. By the adoption of the power system transient stability simulation method, the calculation amount of solving a differential algebra equation set during transient stability simulation of a power system can be remarkably reduced.

The invention discloses a low-voltage power distribution network topology identification method and system based on mutual information. According to the technical scheme, the low-voltage power distribution network topology identification method comprises the following steps of: firstly, time sequence voltage amplitude information data of intelligent electric meters of users in a power distribution area are input, then the data are preprocessed, then mutual information among the users is calculated in sequence through a mutual information calculation formula and stored in a user mutual information set, and finally topology recognition of the low-voltage power distribution area is completed through a maximum weighted spanning tree algorithm. According to the method, the problem that the topology identification difficulty is remarkably increased due to frequent change of network topology caused by large-scale grid connection of high-proportion renewable energy sources can be effectivelysolved, dependence on a physical model of a power system is reduced, and calculation and optimization of the power system are further performed, so that the stability of the power system is improved.

The invention discloses a quantitative evaluation method for stability of a power grid. The method includes steps of acquiring measurement data related to power grid safety and stability through calculation and analysis of a power system; performing modeling on the random dynamic power system; based on the measurement data, analyzing the stability of the power grid by utilizing a critical slowing-down theory. The method is quick in calculation. A large amount of time domain simulation numerical integration is not needed in semi-analytical method; the semi-analytical method is very suitable fora condition with small diffusion matrix strength in a random process.

The invention discloses a dynamic capacity-increasing and effect-raising method for sharing local grid multi-system fused big data. Collection and transmission of transformer information are realized through communication established with a scheduling integrated management system D5000 and a production management system PMS; weather information needed for electric transmission and transformation equipment load prediction is acquired through pushing for an electric power weather information system; real-time and dynamic information supporting is provided for optimization of operation mode in combination with load prediction information of a local grid load dynamic management system by adopting a system heat stability threshold and a tide distribution value provided by electric power system computation system PSASP, and the implantation for a multi-system communication cut-through fusion and big data information interaction sharing technology provides effective technical management means for realizing electric transmission and transformation equipment dynamic capacity increase, fully developing equipment hot redundancy and promoting system integration load capacity for local grid dynamic load intelligent dispatching management.

According to one aspect, an apparatus for computing a solution to a power flow problem for an electrical power system comprising a plurality of buses. The apparatus includes (a) at least one processor comprising a plurality of cores; and (b) memory coupled to the at least one processor for storing an admittance matrix for the power system, real power and reactive power for each bus, and an initial complex voltage for each bus; (c) wherein the at least one processor is configured to: (i) perform a Jacobi power flow calculation for each bus to determine the complex voltage for each bus, the Jacobi power flow calculation using the admittance matrix, the real power and reactive power for each bus, and the initial complex voltage for each bus as inputs, wherein at least two Jacobi power flow calculations are performed concurrently on the plurality of cores; (ii) calculate a power mismatch at each bus based on the complex voltages; and (iii) determine whether the Jacobi power flow calculations have converged based on the power mismatch and repeat (i) to (iii) if the Jacobi power flow calculations have not converged.

The invention discloses a remote connection method and system for computer devices of a power system based on a plurality of windows. The method comprises the implementation steps of pre-configuring remote connection login information for the computer devices of the power system and generating a to-be-connected computer device list; and reading the remote connection login information of a target computer device when a user selects certain appointed target computer device for connection, attempting to carry out connection with the target computer device, judging whether a sub-window corresponding to the target computer device exists or not if the connection is successful, obtaining a focus if the sub-window exists, otherwise, establishing the sub-window, obtaining the focus, and interactingwith a remote connection service program of a target computer through the remote control sub-window. According to the method and the system, the devices of various types can be connected, various remote connection modes are uniformly packaged, the working efficiency of operation and maintenance personnel is effectively improved, and the sub-windows are prevented from being opened repeatedly.

There is provided an information processing device including an acquisition unit that acquires power supply request information that includes information on a supply period during which an electric power system is requesting supply of electric power, and reservation information for a vehicle, a calculation unit that, on the basis of the reservation information, calculates supply power to be supplied to the electric power system from the vehicle during the supply period, and a notification unit that notifies the electric power system of the calculated supply power.

The invention discloses a gas-electricity combined network steady-state load flow calculation method based on a full-pure embedding method. The method comprises the following steps of inputting parameters and operation data of a power system and a natural gas system, using a full-pure function for representing unknown variables in a gas-electricity combined network power flow equation, constructing a gas-electricity combined network power flow equation containing a full-pure function and complex variables, calculating each unknown polynomial coefficient in the full-pure function, analyzing and continuating the full-pure function representing the unknown variable to obtain a numerical solution of the unknown variable, and substituting each unknown variable numerical solution into the power flow equation, checking whether the power flow constraint of the power system is met or not, if the constraint is met, outputting a gas-electricity combined network power flow solution, if the constraint is not met, increasing the series of the original full-pure function, and repeating the process until the constraint is met. According to the method, what is guaranteed is that calculation of the electric power system in the gas-electricity combined network has better convergence, the obtained solution must be a high-voltage solution, and the multi-solution problem of a common method is avoided.

The invention relates to a load data monitoring method, a power system, computer equipment and a storage medium, and is suitable for the power system. The method comprises the steps that drawing equipment receives a connection corresponding relation table sent by a power supply network; the drawing equipment receives power utilization load data, sent by the power supply network, of all the electricity meters; the drawing equipment determines wire inlet cabinets connected with the transformers in the power supply network, wire outlet cabinets connected with the wire inlet cabinets and electricity meters connected with the wire outlet cabinets based on the connection corresponding relation table; the drawing equipment draws a low-voltage distribution network load thermodynamic diagram based on the wire inlet cabinets connected with transformers in the power supply network, the wire outlet cabinets connected with the incoming line cabinets, the electricity meters connected with the wire outlet cabinets and electrical load data of the the electricity meters; and the drawing equipment monitors whether abnormal conditions exist in the transformers, the wire inlet cabinets, the wire outlet cabinets and the electricity meters or not based on the load thermodynamic diagram of the low-voltage distribution network. By adopting the method, the equipment monitoring efficiency in the low-voltage power distribution network can be improved.

The invention relates to a park micro-grid distributed power supply and energy storage coordinated optimization configuration method, and belongs to the field of power system computer software application. The method comprises the steps that original data collection and import design is carried out, and a user interaction visual interface is created and used for importing and visualizing original data needed by micro-grid planning; establishing and designing a distributed power generation model, namely establishing a wind power generation model and a photovoltaic power generation model; establishing and designing an energy storage model, and adopting a KiBaM quasi-steady-state battery simulation model; time-of-use electricity price setting design: designing a time-of-use electricity price setting interface; model control and target optimization design, including micro-grid power balance and storage battery charging and discharging power control design; designing a micro-grid operation program, and optimizing system configuration and a scheduling strategy; and carrying out simulation calculation and result data analysis, verifying the effectiveness of a system optimization configuration scheme, and realizing park micro-grid distributed power supply and energy storage coordinated optimal configuration.

The invention discloses an electric power system computing virtualization method based on a cloud platform architecture system, which comprises the following steps: transferring virtual resources to the edge of an electric power information network under the condition of meeting power grid constraint and environmental requirements, and providing the virtual resources on the edge layer of a cloud platform by utilizing a system architecture integrating raindrop computing, wherein The system architecture comprises a cloud layer, a fog layer, a raindrop server, an edge data storage unit and a sensor / actuator unit. The cloud layer, the fog layer and the sensor / actuator unit work cooperatively; The raindrop server interacts with the fog layer and the cloud layer to meet the received request; Andthe edge data processing unit is an intelligent virtual resource. According to the invention, the intelligent virtual resources are integrated on the edge layer, the Internet of Things service and the data view can be directly provided from the edge device, and the permission-based block chain protocol is integrated, so that the security and reliability of the edge network are realized. The method constructs a distributed virtual system, has the advantages of cloud computing, fog computing and raindrop computing, and can directly provide services at the edge level.

The invention discloses an AC / DC system load flow calculation method and device based on trajectory uniformity, and belongs to the technical field of power system calculation and analysis. The method comprises the following steps: inputting topological parameters of an AC / DC system, node power injection data and boundary constraints of variables; according to the topological parameters and node power injection data, an AC / DC system feasible power flow solution model containing voltage constraints is constructed, and the voltage constraints are converted into equality constraints through slack variables; constructing a QGS based on a feasible power flow solution model, wherein a stable equilibrium point of the QGS corresponds to a solution or a least square solution of a power flow equation; tracking a QGS system track by adopting a numerical integration method, and carrying out integration from an initial point until a convergence condition is met; and judging whether the QGS system converges to a feasible power flow solution or a least square solution according to an integral result, and outputting a corresponding result. According to the method, any initial point in the power flow solution neighborhood can be reliably converged to the power flow solution, and the robustness and practicability of power flow calculation are remarkably improved.

The invention belongs to a checking system for a cooperative relationship between a power plant excitation system and a protection fixed value of a generation-transformer group. The checking system is implemented as follows: an internal parameter list of an automatic adjusting device of an excitation system is collected and a generation-transformer group protection setting calculation sheet and a protection fixed value list are collected; a function computational formula corresponding to a checked content is inputted into an Excel table cell to form a longitudinal column; a right mouse button is clicked in a generated photo, an item of data selection is selected, an item of adding is selected in a window, and naming, X-axis series value selection, and a Y-axis series value selection are carried out; and photo curve generation is carried out. According to the checking system provided by the invention, tedious artificial calculation of an exponential function formula is taken over by Excel office software for calculation, so that data points more than those of the artificial calculation by several times can be compared, the data accuracy can be guaranteed, the compared data can be increased by multiple times, and the data become comprehensive.

The invention belongs to the technical field of power system calculation, and discloses a distribution network short-circuit distance calculation system based on a mobile terminal, which is based on uniapp cross-terminal development framework construction, and integrates three core function modules of transformer substation bus impedance management, wire parameter management and short-circuit distance formula calculation. According to the method, basic parameters such as transformer substation bus voltage, maximum / minimum mode total impedance and the like and impedance data of wires of different models are stored in a structured mode, and a preset short-circuit distance calculation formula is combined, so that rapid calculation of the short-circuit distance and the number of corresponding towers is automatically completed after the basic parameters are input. The invention further discloses a calculation method. The problems that a traditional distribution network short-circuit distance calculation process is tedious, errors are prone to occurring, and data management is scattered are solved, the method has the advantages of being convenient and fast to operate, efficient in calculation, capable of achieving data localization storage and flexible expansion, and the method is suitable for electric power operation and maintenance personnel to rapidly carry out short-circuit distance calculation work on site.

The invention discloses a parallel solving method and system for a system of linear equations of an electric power system based on a Woodbury theory, and belongs to the technical field of large-scale electric power system computation.The method comprises the steps that a coefficient matrix of a network equation of the electric power system is obtained and subjected to block representation; performing truncated singular value decomposition on the non-diagonal block coupling matrix, and realizing low-rank decomposition through an Arnoldi iterative algorithm; carrying out inversion on the coefficient matrix based on a Woodbury matrix identical equation, and carrying out parallel calculation on each block sub-matrix and an intermediate variable; and solving the system of linear equations by using the inversed matrix. According to the method, the low-rank characteristic and parallel computing advantages of the inter-region coupling matrix of the power system are fully utilized, the solving efficiency of the large-scale linear equation set is remarkably improved, and the method is suitable for transient analysis, real-time simulation and other high-performance computing scenes of the power system.