9 results about "Transient energy function" patented technology

A new energy thermal power bundling delivery system control method based on multivariable adaptive decision comprises the following steps: monitoring the total output of a new energy generator group and the total output of a thermal power generating unit in real time, and calculating the real-time bundling proportion; calculating a system vulnerability degree V based on fuzzy comprehensive evaluation: constructing an evaluation system taking the bundling proportion, the system inertia and the voltage sensitivity as indexes, and outputting the system comprehensive vulnerability degree V; carrying out fault event identification and severity S quantification; determining a control mode according to V and S, and calculating the total thermal power output increasing amount and the direct current power decreasing amount of each loop; safety verification and iterative correction of the control instruction: calculating the stability margin of the controlled system based on a transient energy function method, and if the requirement is not met, feeding back to carry out control quantity iterative correction; and issuing the control instruction passing the verification to an execution unit. The method has the advantages that the problem of decoupling of a traditional control strategy and an operation state is solved, and self-adaptive stable control based on system real-time vulnerability and fault severity is realized.

The invention discloses a transient stability evaluation method and device for a multi-VSG parallel system. The method comprises the following steps: obtaining a power system model and a transient energy function according to the system; the transient energy function comprises a kinetic energy function and a potential energy function; obtaining a critical stable energy value according to the power system model and the transient energy function in combination with a BCU method; constructing a first model for obtaining a dynamic coupling relationship between VSGs based on a PINN network; training the first model according to a preset data set to obtain a second model; solving a transient energy function according to the real-time state vector of the system, and solving a path related item in the transient energy function in combination with a second model to obtain a real-time energy value; and if the real-time energy value is greater than the critical stable energy value, determining that the system is unstable, otherwise, determining that the system is stable.

This invention relates to the field of multi-source coordinated control technology in distribution networks, and discloses an automatic switching method and system for multiple power sources in a distribution network. The switching method includes: dynamically modeling the transient power flow of the main power source and distributed power sources in a multi-source distribution network, and performing dynamic response analysis of topology changes; evaluating the system energy obtained from the dynamic modeling using the transient energy function method, calculating the kinetic and potential energy components before and after the switching, and determining the system energy balance state based on the comparison result of the energy difference and the critical energy threshold; and executing phased soft switching control based on the energy evaluation result, through sequential control logic of synchronization stage, power sharing stage, and switching transition stage, and performing gradual power transition between the main power source and distributed power sources according to a predictive control algorithm. This invention achieves real-time power flow reconstruction under topology changes, energy-driven switching decisions, and smooth power transition, reducing voltage fluctuations and transient impacts caused by switching.

This invention discloses a method, device, equipment, and storage medium for inertia regulation of a grid-type converter, belonging to the field of power electronic grid-type converter control technology. The method includes: establishing a second-order equivalent transient model; introducing transient compensation into the active power control loop, processing the second-order equivalent transient model to obtain a transient-compensated second-order equivalent transient model; then constructing a transient energy function under compensation based on this model; constructing a transient recovery time based on the transient energy function; adjusting historical inertia parameters based on a target parameter prediction model, under constraints of angular frequency deviation and angular frequency change rate, with the goal of minimizing the transient recovery time, to obtain updated inertia parameters; and applying the updated inertia parameters to the virtual synchronous machine oscillation control loop. The technical solution provided by this invention can improve the accuracy and simplicity of inertia regulation, shorten the transient recovery time under strong disturbances, and improve the stability of the power system.

This invention discloses a distributed energy storage collaborative scheduling system for power systems, relating to the field of distributed energy storage optimization technology. It achieves quantitative assessment of the transient stability of the distribution network through transient energy functions, quantifies the system stability margin, and converts it into energy storage output commands. By constructing a two-dimensional hierarchical scheduling mechanism, it divides energy storage levels based on electrical distance and power sensitivity coefficients, and differentiates the allocation of near-end damping output and far-end balancing output to achieve optimal allocation of spatial resources. Simultaneously, it establishes a multi-timescale hierarchical control system, performing hierarchical control based on the response speed of energy storage devices, fully leveraging the advantages of fast and slow energy storage characteristics, and covering the entire transient process of a fault. Furthermore, it adopts a fully closed-loop adaptive scheduling architecture, with the energy storage cluster providing real-time feedback on its operating status, driving the system to dynamically adjust scheduling strategies until the distribution network returns to steady-state operation.

The invention discloses a limit power transmission distance calculation method for transient voltage stability, and belongs to the field of power systems and automation thereof. The method comprises the following steps: establishing a transient energy function model based on a power system equipment mathematical model and an energy function theory; establishing a transient voltage stability evaluation index by using the model; calculating index values under different fault positions and different line parameters to obtain a sensitivity line graph of the line parameters and transient voltage stability; analyzing the line graph and scoring and positioning key lines; determining a power transmission line parameter selection range based on a key line sensitivity relation, and calculating a limit power transmission distance by combining engineering common power transmission line models and parameters. According to the method, transient voltage stability evaluation and parameter sensitivity analysis are combined, the limit power transmission distance is scientifically calculated, the defect that the transient voltage stability is neglected in a traditional method is overcome, and accurate and reliable technical reference can be provided for line erection planning and power grid operation mode optimization and adjustment in actual engineering.

The invention provides a new energy power system stability evaluation method based on a transient energy function and a related device, and relates to the technical field of power systems. The method comprises the steps of dividing a new energy electric field, a synchronous generator and a load node type and establishing a dynamic model; constructing a kinetic energy function based on the block diagonalization inertia matrix, constructing a potential energy function by adopting trapezoidal integral, and synthesizing a total transient energy function; applying a fault and simulating to a clearing moment, and calculating the total energy of the system; taking the fault clearing state as a starting point, searching a nearest unstable equilibrium point through a gradient rising method, and calculating critical potential energy; and comparing the total energy with the critical potential energy to judge the transient stability. New energy and a synchronous machine are dynamically and uniformly incorporated into an energy framework for the first time, and the model accuracy is improved; through efficient energy modeling and balance point searching, rapid quantitative evaluation of the transient stability of the high-proportion new energy power system is achieved, and the method is suitable for online safety early warning and prevention control and has important engineering application value.

The application provides a kind of energy router coordination method and system for new energy station voltage ride-through, belongs to the field of power electronics and new energy grid-connected control technology, its method includes, first, the voltage of grid-connected point is collected, the dynamic threshold set is calculated and the hysteresis logic is introduced;Then realize seamless switching of three operating modes according to the threshold, reconstruct power unit;Then decompose voltage and current sequence components, generate positive and negative sequence current instructions and superimpose virtual impedance limiting;Fusion deep reinforcement learning and transient energy function, adaptive setting control parameters;Finally, combined with related instructions, state and parameters, execute multi-port energy interaction dynamic coordination, improve the voltage ride-through performance of new energy station.The application realizes new architecture through dynamic multi-modal control+coordination current limiting support+intelligent adaptive parameter tuning+multi-port collaboration, significantly improves the ride-through performance of new energy station under grid voltage sag / fault, takes into account grid stability and equipment safety, has significant innovation and practical value.

The application discloses a transient stability evaluation method and device for a multi-VSG parallel system, and the method comprises the following steps: obtaining a power system model and a transient energy function according to the system; the transient energy function comprises a kinetic energy function and a potential energy function; obtaining a critical stable energy value according to the power system model and the transient energy function combined with a BCU method; constructing a first model for obtaining a dynamic coupling relationship between VSGs based on a PINN network; training the first model according to a preset data set to obtain a second model; solving the transient energy function according to a real-time state vector of the system, and solving a path-related term in the transient energy function combined with the second model to obtain a real-time energy value; if the real-time energy value is greater than the critical stable energy value, it is determined that the system is unstable, otherwise, it is determined that the system is stable.