454 results about "Tie line" patented technology

The invention discloses a state grid provincial multi-stage power system cooperative scheduling operation method and device. Comprising the following steps: constructing a state-grid-province multi-stage power system collaborative scheduling model according to a state dispatching target demand, a network dispatching target demand, a province dispatching target demand, load balance constraints of each level, multiple direct dispatching unit output upper and lower limit constraints, tie line transaction constraints, province dispatching unit output constraints and positive and negative standby constraints; constructing a provincial domain equivalent aggregation node and a network domain equivalent aggregation node to simplify the structure of the state grid provincial multi-stage power system collaborative scheduling model; and solving the simplified state grid provincial multi-stage power system cooperative scheduling model based on a target cascade method to obtain a multi-stage power system cooperative scheduling operation result. The invention belongs to the field of power system collaboration. According to the method, the optimization scheduling solving efficiency of the power system under whole-network cooperation is improved.

The invention provides a virtual power plant planning method and system based on flexibility vacancy partition evaluation. The method comprises the steps that node flexibility supply and power fluctuation quantity are calculated; determining tie line transmission capability constraints, and constructing a flexibility mutual aid scheme optimization model; solving the model to obtain a flexibility mutual aid scheme; calculating the adjustment demand of each partition in combination with a node flexibility supply and demand and flexibility mutual aid scheme; constructing a controllable resource physical characteristic model, simulating a resource operation state and an adjustment capability, and calculating a proportional relation between the adjustment capability and the capacity based on a simulation result; obtaining different aggregation modes and aggregation difficulties, calculating a unit capacity aggregation cost coefficient, and constructing a virtual power plant cost model; and constructing an optimal configuration model by taking meeting of adjustment requirements of each partition as a constraint and taking the minimum total aggregation cost as a target, and solving to obtain the virtual power plant aggregation resource type and capacity of each partition. Based on the method, the invention also provides a virtual power plant planning system. According to the invention, rapid and accurate optimization planning of the virtual power plant is realized.

The invention provides a power grid frequency modulation cooperative control method considering a tie line section, and relates to the field of power system automatic scheduling, and the method comprises the steps: obtaining a load characteristic parameter, a transmission capacity parameter and a stability margin parameter of a section spanned by a tie line; solving the multi-objective optimization model by adopting an improved particle swarm optimization algorithm to obtain an optimal tie line electric power distribution curve meeting various constraint conditions; discretizing the optimal tie line electric power distribution curve, and converting the discretized optimal tie line electric power distribution curve into an active power instruction value of a tie line control system; and the tie line control system adjusts the electric power of the tie line in real time according to the active power instruction value. According to the invention, the reasonable distribution of the electric power of the tie line is realized, the frequency modulation demand and transmission capacity limitation of each section are balanced, and the safety and stability of power grid operation are improved. Through a differential scheduling strategy and a real-time optimization mechanism, load fluctuation can be effectively coped with, and safe and stable operation of a power grid is guaranteed.

The invention discloses a power distribution network-virtual power plant non-iterative collaborative optimization scheduling method and a related device, and relates to the field of power system optimization scheduling calculation, and the method comprises the steps: building a virtual power plant optimal economic scheduling model according to the characteristics of access resources in a virtual power plant; according to the optimal economic dispatching model of the virtual power plant, determining a variation range constraint of the power of the tie line of the virtual power plant based on a rapid approximate projection method of a feasible region of operation of the virtual power plant; constructing a non-iterative collaborative optimization scheduling model of the power distribution network and the virtual power plant based on variation range constraints according to a scheduling decision target of the power distribution network, a scheduling target of the virtual power plant and characteristics of access resources; according to the collaborative optimization scheduling model, solving a power distribution network scheduling result and a virtual power plant tie line power scheduling result; and inputting the tie line power scheduling result into the optimal economic scheduling model of the virtual power plant to obtain an optimal scheduling result of internal resources of the virtual power plant. According to the invention, the decision-making efficiency of collaborative optimization scheduling can be improved.

The invention discloses a power distribution network toughness improvement method and device considering multi-element flexibility resources, and the method comprises the steps: calculating the wind speed of each node of a power distribution network according to a typhoon wind field model, and calculating the fault probability of a power distribution line according to the wind speed of each node and a line breakage and tower fault probability model, so as to simulate the power failure process of the power distribution network under a typhoon disaster. Establishing an objective function by taking minimization of load reduction quantity and operation cost of the power distribution network as optimization objectives, establishing line reinforcement resource constraints, tie line resource constraints, energy storage resource constraints, wind power resource constraints and operation constraints of the power distribution network based on the fault probability of the power distribution line, and generating a power distribution network optimization scheduling model according to the constraints of the objective function; according to the method, the load reduction amount and the operation cost of the power distribution network are effectively reduced, the power failure scale is reduced, the power failure time is shortened, and therefore the toughness level of the power distribution network is effectively improved when extreme disasters happen.

The invention discloses a power distribution micro-grid double-layer optimization scheduling method, which is suitable for the technical field of power optimization scheduling, and comprises the following steps: S1, constructing an upper-layer power distribution network optimization scheduling model by taking the minimum network loss in an active power distribution network system as an objective function, and setting a corresponding upper-layer optimization constraint condition; s2, taking the minimum grid-connected operation cost in the micro-grid system as an objective function to construct a lower-layer micro-grid grid-connected optimization scheduling model, and setting corresponding lower-layer optimization constraint conditions; and S3, solving the grid-connected optimal scheduling model of the lower-layer micro-grid by adopting a second-order cone technology to obtain a tie line coordination parameter, determining a micro-grid access point type according to the tie line coordination parameter, and solving the optimal scheduling model of the upper-layer power distribution network by calling a Cplex solver and combining with a parameter corresponding to the micro-grid access point type to obtain a scheduling strategy. According to the invention, efficient collaborative optimization scheduling of the distribution microgrid system is realized, and the economical efficiency, robustness and flexibility of the system are improved.

The invention provides a load frequency control method for a multi-region combined power system considering wind power integration, and the method comprises the following steps: building a combined state space model of the multi-region combined power system, comprising a state space sub-model of a wind power region, a state space sub-model of a thermal power region and tie line power deviation constraint relationships among the regions; a combined control topology of the multi-area combined power system is established, the combined control topology comprises a sub-control topology of a wind power area, a sub-control topology of a thermal power area and a tie line power deviation feedback topology, and the tie line power deviation feedback topology comprises feedback devices which are the total number of the wind power area and the thermal power area; and controlling equipment in the wind power area and the thermal power area to carry out power grid load frequency adjustment by using a control instruction output by the combined control topology. According to the technical scheme, dynamic response speed characteristics of wind power and thermal power and comprehensive frequency modulation requirements are considered, and optimal load frequency adjustment is carried out on the multi-region power system.

The invention belongs to the field of electric power system scheduling, and relates to a multi-microgrid cooperative scheduling method based on a master-slave cooperative game and target cascade analysis, which utilizes the cooperative scheduling problem of electric power resources and carbon emission of a multi-microgrid system to construct a double-layer master-slave cooperative game framework. Power scheduling and operation strategies of the micro-grid alliance are planned as a whole; the micro-grids of the lower-layer micro-grid alliance realize power transaction and resource sharing through a cooperative game; based on a target cascade analysis algorithm, introducing an Anderson acceleration method to dynamically adjust tie line power, and combining an augmented Lagrangian penalty function to process constraints, optimizing an upper and lower layer decoupling iteration process and accelerating convergence; the problem of low efficiency of multi-agent collaborative optimization is effectively solved, stable system power and reasonable distribution of electric energy resources are ensured, and technical support is provided for operation of a multi-microgrid system.

The invention discloses a distribution-micro collaborative operation simulation optimization method, which belongs to the technical field of simulation optimization, and comprises the steps of preprocessing grid-connected point voltage data, tie line power data and communication time delay data, constructing a power distribution network power flow physical network following a Kirchhoff's law, outputting a source load power prediction curve by using a long short-term memory network algorithm, and calculating the distribution-micro collaborative operation according to the source load power prediction curve. And a distribution-micro collaborative simulation optimization model is obtained based on residual error rolling correction tie line impedance parameters, a delay penalty term is set in a target function in combination with the preprocessed communication delay data, a power regulation instruction is obtained by using a particle swarm optimization algorithm, and a dynamic simulation video stream is generated. According to the invention, through rolling correction of the tie line impedance parameters and setting of the delay penalty term positively correlated with the time delay, the problem of control failure caused by physical deviation caused by model parameter solidification and communication time delay accumulation is solved, and the defects of voltage deviation calculation distortion and inaccurate network loss evaluation are eliminated. And the simulation precision and the operation stability of distribution-micro cooperation are improved.

The invention provides a power distribution area interconnection planning method and related equipment, and the method comprises the steps: obtaining the historical data of distributed new energy output and load power of a target area, and calculating the maximum net load rate of each low-voltage power distribution area to determine a heavy overload area; the method comprises the following steps of: interconnecting a heavy overload transformer area and a transformer area connected with new energy with other normal transformer areas, screening out interconnectable combinations of the transformer areas, and taking all original connecting lines of a medium-voltage distribution network as SOP to-be-selected lines; based on the interconnectable combination of the transformer area and SOP candidate lines, by constructing a target function and constraint conditions with the optimal economical efficiency as a target, obtaining a mixed integer linear programming model converted from a distribution transformer area interconnection stochastic programming model under multiple scenes and solving the mixed integer linear programming model, and obtaining a transformer area interconnection programming scheme and a medium-voltage distribution network SOP access condition; power mutual aid and capacity sharing between low-voltage distribution areas are achieved, local consumption of distributed new energy is promoted, and the heavy overload phenomenon of the areas is relieved.