9results about How to "Smooth power fluctuations" patented technology

The invention discloses a micro-grid stability enhancing method and system based on ocean energy, and relates to the technical field of micro-grids, and the method comprises the steps: carrying out the load prediction of a micro-grid according to a future time zone, and obtaining the load demand of the micro-grid; performing power generation characteristic prediction on the ocean energy power generation system to obtain an ocean energy power generation prediction map; performing multi-energy complementary scheduling on the ocean energy power generation system to obtain an ocean energy power generation strategy; according to the ocean energy power generation strategy, micro-grid stability is enhanced, and an optimized power generation strategy is obtained; and performing power supply management on the micro-grid according to the ocean energy power generation system based on the optimized power generation strategy. The technical problems that in the prior art, due to power generation intermittency and volatility when ocean energy is connected into the micro-grid, power of the micro-grid is unbalanced, and operation stability and power supply reliability are reduced are solved, and the purpose of optimizing the power supply reliability through prospective load and power generation prediction and multi-energy complementary optimization scheduling is achieved. The power fluctuation is effectively stabilized; and the power supply reliability and the operation stability of the micro-grid are improved.

The application discloses a kind of network type variable-speed pumped storage unit low voltage ride through control method and system, when grid drop fault occurs, grid-side converter maintains transient power angle stability by improving virtual synchronous control (VSG) active power ring, and introduces PI control in reactive power ring to improve response speed, according to low voltage ride through standard calculation and output power instruction;At the same time, based on synchronous rotating coordinate system, current positive and negative sequence separation control is implemented to ensure three-phase current balance under asymmetric fault, and virtual impedance is introduced to suppress transient overcurrent, to prevent converter lockout.Machine-side converter utilizes the adjustable characteristics of unit speed, so that the active power of machine-side follows the power of grid-side, and the transient unbalanced energy is converted into rotor kinetic energy storage by increasing rotor speed, so as to suppress the power fluctuation of DC bus and maintain the stability of DC voltage.The application improves the transient stability and grid-connected safety of the unit during low voltage ride through.

The invention provides a new energy unit transient stability optimization method and system based on active feed-forward, and belongs to the field of new energy power generation. The system includes a current command generator and a current controller. The method comprises the steps of collecting terminal voltage and current of a unit, calculating active power and detecting a transient fault; when a fault is detected, generating an active current instruction through active feed-forward control based on power grid voltage information obtained by an active power signal, a fault voltage amplitude signal and phase locking; meanwhile, a reactive current instruction is generated; a current reference instruction is synthesized, and a converter is driven through closed-loop control to provide power support. According to the method, an active feed-forward mechanism is introduced, so that the new energy unit can respond to the power shortage of the power grid in advance, active and reactive support is quickly provided, frequency drop and power oscillation in the transient process are effectively inhibited, and the transient stability of the power system under the access of high-proportion new energy is remarkably improved.

This invention relates to the field of new energy power generation and energy storage, and in particular to a method and system for limiting power distribution, comprising: setting a total power distribution capacity limit value, wherein the total power distribution capacity limit value is an unsigned value representing the maximum absolute value of power allowed at the grid connection point; calculating in real time the total active power at the connection point between the new energy grid-connected equipment and the power distribution facilities; dynamically calculating the power output limit value of the new energy grid-connected equipment based on the total power distribution capacity limit value and the total active power through a closed-loop control algorithm, wherein the power output limit value includes a positive power limit value and a negative power limit value; and controlling the output power of the new energy grid-connected equipment using the positive power limit value and the negative power limit value as boundaries. This invention, through detailed parameter settings, signal processing, algorithm calculation, and hardware control procedures, fully realizes bidirectional power distribution limitation, effectively protecting the safety of user-side power distribution facilities.

The application discloses a substation openable capacity access evaluation method considering flexible resources, and belongs to the field of substation openable capacity evaluation. First, a substation openable capacity calculation model is established, then a substation optimization scheduling model considering flexible resources is established by considering energy storage systems and orderly charging of electric vehicles, the maximum value of the equivalent load of the substation is obtained, and finally, the substation openable capacity calculation model is solved. On the basis of the existing openable capacity research, the energy storage system is considered to participate in peak load shifting and valley filling, and the electric vehicles are considered to be orderly charged. The minimum peak-valley difference of the substation load and the lowest charging cost of the electric vehicle users are taken as the objective functions, the substation optimization scheduling model considering flexible resources is established, the effects of suppressing new energy power fluctuation, improving new energy consumption level and relieving peak shaving pressure are achieved, the power supply potential of the substation is fully tapped, the user side load peak is reduced, and thus the openable capacity of the substation is improved.

The invention belongs to the related technical field of energy systems, and provides an energy router optimization method and system based on information physical fusion, an energy router system is constructed into a directed graph model, a node set represents various physical devices, and an edge set represents an energy flow path between nodes; carrying out shortest path search by adopting a path search algorithm, optimizing a minimum loss energy path for a source-load in real time, and generating a dynamic routing table; on the basis of economic flow and power flow, an energy storage carbon collaborative optimization target is introduced, a multi-target optimization model is constructed, and dynamic optimization of an energy transmission path, rapid stabilization of power fluctuation and unified optimization of economic and carbon emission targets are realized.

The invention provides a grid-connected and off-grid control system and method for a wind turbine generator. A control module judges a system operation mode by monitoring a real-time state of a power grid side of a boosting transformer. When the power grid is normal, the wind turbine generator generates power through the boosting transformer in a grid-connected mode and supplies power to the power grid preferentially. And when the power grid has a fault or the voltage fluctuation exceeds a threshold value, switching to an off-grid mode, and supplying power to a local load by the wind turbine generator, the energy storage module and the diesel generator set. The power utilization requirements in the grid-connected mode and the off-grid mode are determined through the simulation load, whether power distribution is reasonable or not is verified according to the power utilization requirements, and stable power supply of the power utilization load is ensured. In the grid-connected mode, the control module adjusts the output power of the wind turbine generator and controls the charging and discharging of the energy storage module according to the demand of a power grid and the power generation capacity of the wind turbine generator, so as to stabilize the power fluctuation; in the off-grid mode, the control module coordinates the output of the wind turbine generator set, the diesel generator set and the energy storage module according to the change of the electrical load.

This invention discloses a fully controlled rectifier on the engine side and its control method. The fully controlled rectifier power conversion scheme of this invention has strong control capability. It can change the hydraulic fluid flow rate by controlling the engine speed, and suppress power fluctuations in conjunction with the hydraulic motor and hydraulic accumulator. It can greatly reduce the capacity of the system energy storage link. At the same time, it has the advantages of high system efficiency and low output current harmonics. Therefore, this invention uses a three-phase voltage-type fully controlled rectifier based on IGBT.

The invention relates to the technical field of information, in particular to an intelligent charging pile control method and system supporting light storage linkage. The method comprises the following steps: obtaining real-time output data of a park photovoltaic power generation system, a park short-time prediction load, charging state information of a new energy vehicle, energy storage state data of a fast charging and discharging energy storage device and vehicle use time of a user; reading the real-time output data, the park short-time prediction load and the energy storage state data according to a preset scheduling period, and judging whether light abandoning and power gaps exist in a next scheduling period; when the light abandoning exists, scheduling the new energy vehicle in a chargeable state to consume the light abandoning electric quantity for charging, and recording the consumed electric quantity; when the power gap exists, the new energy vehicle meeting the preset discharging condition is controlled to reversely discharge towards the park through the charging pile, and the discharging electric quantity is recorded; and respectively carrying out charge metering on the charging electric quantity, the consumption electric quantity and the discharging electric quantity participated by the new energy vehicle to obtain a final charging charge.