60results about How to "Improve FM effect" patented technology

The invention discloses an optimizing control and capacity planning system and method for involving an energy storage device into machine set frequency modulation. The method comprises the steps that after being connected with a power conversion device and a wave filtering device in sequence, an energy storage unit gets access to a regional power grid, and a logic judgment device is connected with a device for sending an AGC instruction of a dispatching center of the grid, an outlet of a traditional machine set and the power conversion device; the AGC instruction of the dispatching center of the grid is transmitted to the energy storage device and the traditional machine set simultaneously, and the logic judgment device collects the AGC instruction, the outlet power of a power generator and battery electrical charge state information of the energy storage device and judges the outlet power of the energy storage unit at each moment. The optimizing control and capacity planning system and method for involving the energy storage device into the machine set frequency modulation have the advantages that the energy storage device in introduced into the power generation side, the frequency modulation effect can be improved, and the problems that in a traditional frequency modulation mode, the response speed is low, the modulation precision is low, and machine set 'back-modulation' and dead zone vibration exist, can be effective inhibited.

The invention relates to a multi-domain electric power system load frequency control method with wind storage. The method comprises the following steps of S1, constructing a multi-domain electric power system and establishing a mathematic model of an electric generator; S2, establishing a state model containing an uncertain item; S3, designing a sliding mode surface; S4, designing a sliding mode load frequency controller; S5, carrying out interval division on an electric power system load and providing different control strategies aiming at loads in different intervals. Compared to the prior art, by using the method of the invention, an energy storage subsystem is participated in system frequency adjusting, and the uncertain item of a parameter in an interconnection system and a control channel time delay problem of an energy storage system are considered. According to an interval of a system load disturbance change, the different control strategies are provided, and the method possesses advantages that a system frequency offset and system overshoot are low; a time terminal is adjusted and electric power system stability is high. Compared to a system with energy storage under traditional PI control, by using the method of the invention, a capacity of energy storage equipment is reduced and investments of the electric power system are decreased.

The invention provides a control method and a device for connecting wind power to a flexible HVDC transmission system. Firstly, the actual frequency of an AC grid at a receiving end, the actual frequency of an AC bus bar at a wind farm side, the actual voltage at a DC side of a receiving end converter station are obtained, and the reference voltage at the DC side of the receiving end converter station is determined. Then, the voltage of DC line, the frequency of AC bus and the active power of wind farm are controlled separately, which has high reliability, short frequency modulation response time and good frequency modulation effect. Virtual synchronous machine droop control is adopted in the sending-end converter station, which improves the response speed of frequency regulation and shortens the time of frequency modulation. The frequency of the alternating current bus on the wind farm side is controlled by fixed frequency control or frequency conversion control, The active power of wind farm is controlled by virtual inertia, which makes the increased or decreased power released or supplemented in time when the flexible HVDC system provides frequency modulation for the receiving AC network, and reduces the risk of HVDC line voltage exceeding the limit, and greatly improves the reliability of HVDC system.

The invention discloses a frequency control method and system for an interconnected power system containing energy storage resources. The control method comprises the following steps: establishing a frequency response model of a regional interconnected power system containing energy storage frequency modulation resources; performing frequency division processing on the ACE signal to obtain a powerreference value borne by a traditional unit and an energy storage resource; establishing a space state model and discretizing the space state model; designing a distributed model prediction controller, and establishing an optimization objective function and constraint conditions; and solving a quadratic programming problem formed by the optimal objective function and the constraint condition to determine an optimal control sequence, and enabling a first control variable in the control sequence to act on a traditional unit and energy storage resources to realize optimal control. The control strategy provided by the invention can reasonably allocate the frequency modulation responsibilities of a traditional unit and the energy storage resources, gives play to the advantages of quick outputof energy storage and large frequency modulation capacity of the unit, and can quickly stabilize the frequency fluctuation caused by load and new energy injection in a power system.

The invention provides an auxiliary frequency modulation method for cluster temperature control loads to participate in power network AGC. The dynamic characteristics of temperature control loads anduser comfort are analyzed to evaluate the adjustable capacity range of cluster temperature control loads; according to the different intervals of Area Regulation Requirement (ARR) signals, the coordinated control principle of dynamically distributing the AGC secondary frequency modulation demand to the conventional generating unit and the temperature control load is formulated, the operation timeof auxiliary frequency modulation of the temperature control loads, the operation depth and specific operation mode are determined so as to make full use of the performance advantage of temperature control load without affecting the comfort of users, reduce the frequency modulation pressure of conventional units, speed up the frequency regulation speed, restrain the power fluctuation of tie line of interconnected power network, and effectively improve the frequency modulation effect of power network.

The invention discloses a method for frequency control of a doubly-fed wind farm considering the optimal rotor inertial kinetic energy. The method is based on the proposed method for optimizing the rotating reserve capacity of a wind farm considering the rotor inertial kinetic energy, further adopts a linear control path with the overspeed and the pitch angle coordinated, and adjusts a droop coefficient by taking the sum of the rotor inertia kinetic energy and the pure mechanical load shedding capacity stored in each unit of the double-fed wind farm as the rotating reserve capacity, so that the rotor inertial kinetic energy can be fully utilized in the frequency droop control. The method of the invention can allow the double-fed wind farm to achieve substantially the same frequency modulation effect at a smaller wind curtailment cost as that at a conventional standby operation mode when a standby optimization operation mode is executed; and can allow the double-fed wind farm to obtaina better frequency modulation effect at the same wind curtailment conditions than in a conventional standby mode when a scheduling optimization operation mode is performed.

The invention belongs to the technical field of gas turbine equipment, in particular to a coupling elastic-support type oil film damper bearing system for a gas turbine. The coupling elastic-support type oil film damper bearing system comprises a mouse cage bearing seat, a damper housing, a sleeve, an elastic ring, a locknut, a ball bearing, sealing rings and an oil injection ring; the elastic ring is installed and clamped between the damper housing and the sleeve; the two ends of the elastic ring are each equipped with the sealing ring for controlling oil drainage of the corresponding end part; a flange end of the mouse cage bearing seat and a flange end of the damper housing are fixedly connected with a stator case of the gas turbine by virtue of bolts which are uniformly distributed inthe circumferential direction; the ball bearing for supporting a rotor and a shaft neck is installed inside a cantilever end of the mouse cage bearing seat; the locknut is used for twisting and fixingthe axial positions of the sleeve and the ball bearing; and the sleeve is matched with the cantilever end of the mouse cage bearing seat in a contacting manner. The coupling elastic-support type oilfilm damper bearing system provided by the invention improves the stability of the oil film damper so that a rotor-support system of the gas turbine can steadily get through the critical speed of rotation in each stage and stably runs under a main working state.

The invention relates to a temperature control load participated electric power system primary frequency modulation method based on double-layer control. The method is characterized in that in the upper layer, each temperature control load aggregator is regarded as a virtual generator set; a virtual droop coefficient changing in real time is constructed, the variable droop coefficient can adjust power distribution according to the real-time adjusting capacity of the aggregators, the adjusting power of each aggregator is within the adjusting capacity of the aggregator, a dispatching center distributes power deviation values to a traditional unit and each load aggregator accordingly, and the frequency modulation effect is effectively improved; the participation degree autonomously selected by the user is designed at the load end of the lower layer, and the loads are sorted according to a temperature priority list method, so that the switching frequency of the loads is effectively reduced, and the loss of equipment caused by frequent starting and stopping of the loads is reduced. The technical scheme of the method is feasible, the temperature control load can be effectively controlledon the premise that the comfort degree of a user is guaranteed, the frequency quality of a power system is improved, and the application value is high.

The invention discloses a primary frequency modulation method of a wind turbine generator coordinating with a synchronous generator set. The method comprises the following steps: judging whether an absolute value of a difference between power grid frequency and rated grid frequency is greater than a threshold; if the absolute value is greater than the threshold, measuring current wind speeds of draught fans in the wind turbine generator; dividing the draught fans into different operation modes when the current wind speeds are greater than the rated wind speed, establishing different frequency modulation mathematic models for the draught fans in different modes, and calculating the frequency modulation output of the draught fans in corresponding operation modes according to the models; calculating a deviation absolute value of the power grid frequency and rated grid frequency, and judging a regulation and control area of the grid according to the deviation absolute value; selecting different frequency modulation outputs for the synchronous generator set according to the regulation and control area of the grid; and performing frequency modulation by the wind turbine generator and the synchronous generator set according to respective frequency modulation outputs. According to the method disclosed by the invention, the frequency modulation output between the wind turbine generator and the synchronous generator set can be coordinated, and the frequency modulation effect of the grid containing the draught fans is improved.

The invention discloses an AHP (analytic hierarchy process) and GA (genetic algorithm)-based parameter optimization method applied to the participation of an energy storage device in power grid frequency modulation. The method includes the following steps that: the energy storage device and a controller thereof are added into a regional frequency modulation model; the analytic hierarchy process is utilized to determine the weight of the factors of the controller that influence a control effect, so that a fitness function can be obtained; the genetic algorithm is utilized to optimize control parameters, so that optimized parameters can be obtained; and the optimized parameters are screened according to the fitness function, optimized individuals are obtained; and the optimized individuals are transported to the energy storage device to control the output power of the energy storage device. According to the AHP (analytic hierarchy process) and GA (genetic algorithm)-based parameter optimization method applied to the participation of the energy storage device in power grid frequency modulation of the invention, an energy storage device assisted AGC frequency modulation mode is adopted, and therefore, frequency modulation performance can be effectively improved, frequency disturbance can be suppressed effectively, the frequency deviation of a system can be effectively reduced, and adjustment time can be shortened; and the analytic hierarchy process and genetic algorithm are adopted to set the parameters of the controller, so that high accuracy and high flexibility can be realized.

The invention discloses a power and frequency regulation control method for a photovoltaic energy storage power station, a power and frequency regulation controller of the photovoltaic energy storage power station has an AGC function and a rapid frequency regulation function, and the power and frequency regulation controller directly collects the voltage and current of a grid-connected point and calculates the frequency and power of the grid-connected point in real time, and quickly issues a power and frequency regulation instruction to each photovoltaic inverter and each energy storage converter through a quick communication GOOSE mechanism. Based on the power generation loss of the whole station, according to the frequency change of the grid-connected point, the AGC scheduling instruction is combined, the stress of the whole station is calculated, the rapid frequency modulation effect is good, and the practicability is high.

The invention discloses a frequency modulation method, a device, a device and a medium of a wind turbine generator system. Under the ultra-low wind speed mode, the frequency modulation is controlled by a flywheel energy storage frequency modulation control module. In the low wind speed mode, the flywheel energy storage module still participates in frequency modulation, the overspeed load sheddingcontrol in the integrated load shedding control module plays a role, and the droop control and virtual inertial control participate in frequency modulation. In medium wind speed mode, overspeed load shedding control and variable pitch control are used to control frequency modulation, sag control and virtual inertia control. In high wind speed mode, variable pitch control FM, droop control and virtual inertia control are used to control FM. Frequency modulation is realized by coordinating and coordinating all kinds of control links under different wind speed modes, so that the frequency of thepower network is stable.

The invention belongs to the technical field of automatic power generation control of a unit and provides a method for realizing a frequency modulation function of a gas-steam combined cycle unit. The method comprises the following steps of: advancing a frequency modulation implementation way of a gas turbine control system, adding a frequency modulation control logic in a steam turbine control system by ascending/descending an external reserved load interface so as to control a frequency modulation load of a gas turbine, and adding the frequency modulation function in the steam turbine control system, thereby realizing the modulation frequency function of the gas-steam combined cycle unit. The method can be used for meeting the requirements of related standards, providing valuable technical references for similar units and optimizing the frequency modulation performance of the gas-steam combined cycle unit, thus having high popularization and application values.

The invention discloses a microgrid secondary frequency modulation method based on adaptive online model identification, and the method comprises the steps: by obtaining the output power of each converter in a system, the reference power of a control center, the voltage frequency of a PCC (point of common coupling) of an island microgrid and other external characteristic information when the structure of the island microgrid changes, performing online adaptive optimization fixed-order black box modeling on power frequency characteristics of the microgrid, taking an obtained optimal power frequency characteristic equivalent model as a prediction model in dynamic matrix control, establishing a secondary frequency adjustment target function, solving the function through an intelligent algorithm to obtain a secondary frequency modulation power instruction, and issuing the secondary frequency modulation power instruction to each frequency modulation unit to achieve secondary frequency adjustment of the island microgrid. According to the method, the real-time adaptive modeling can be carried out on the power frequency characteristics of the island microgrid under different working conditions, and model parameters of a frequency modulation control algorithm are updated according to a real-time model, so that efficient and high-quality secondary frequency adjustment is realized.

A testing method or apparatus utilizes a filter or modifier to measure time varying or dynamic harmonic, intermodulation, cross modulation, and or N-Beat or triple distortion from a device. With a stairstep or arbitrary signal and another signal, Nth order harmonic, cross modulation, triple beat, N-Beat, and or intermodulation distortion is measured via the filter or modifier at different offsets or time provided by an arbitrary low frequency signal. For example, an amplifier with crossover distortion will show increased (e.g., time varying) harmonic, cross modulation, triple beat, and or intermodulation distortion near the zero crossing while providing less distortion in other portions of the transfer curve of the amplifier. One or more distortion signals from the device (e.g., audio device) may be measured for a phase and or frequency modulation effect.

The invention provides a microgrid frequency control method based on reinforcement learning, and the method comprises the steps: 1, building a microgrid frequency control model: controlling the outputpower in a mode of controlling the frequency and voltage amplitude, and adjusting a droop parameter for frequency modulation control; step 2, a frequency control strategy based on reinforcement learning: designing a state space, an action set and a reward function according to a specified frequency, and training a Q table to select an optimal correction amount; and step 3, establishing a microgrid frequency control system based on reinforcement learning: training different scenes based on Q learning, and verifying the effectiveness and adaptability of the proposed method from multiple aspectsof a learning training process and frequency control response characteristics.

The invention discloses a multi-source energy storage device control method based on a power distribution network load frequency index, and belongs to the technical field of multi-source energy storage device control. The method comprises: a lithium battery and an oxyhydrogen fuel cell having different response speeds to frequency indexes, rapidly calculating a frequency index corresponding to thedifference between the load power and the generated power of the power distribution network according to 24 hourly moment data of the difference between the load power and the generated power of thepower distribution network predicted on the next day, and selecting different adjustment strategies by comparing the frequency index with adjustment capability indexes of a lithium battery, a hydrogenstorage device and a hydrogen-oxygen fuel cell. Through the synergistic effect, the adjusting effect on the multi-energy system is enhanced, and the control frequency of the multi-source energy storage device is stable.

The invention discloses a system for improving power flexibility and a method thereof. The system is composed of a multi-stage compressor, a multi-stage cooler, a gas-liquid conversion device, a liquid air storage tank, a multi-stage heater, a multi-stage expander, a heat storage system, a generator set, a flexibility control device and a control valve; and the operation method of the system comprises an energy storage mode and an energy release mode. When the system and the method thereof are applied to a coal-fired power plant, the peak regulation capacity and the response speed of the unitcan be improved, the frequency modulation performance of the unit is improved, the stability of electric output power can be improved when the system and the method thereof are applied to a photovoltaic power plant and a wind power plant, and the new energy consumption capacity of a power grid is improved.

The invention discloses a photovoltaic virtual synchrony control method of an inverter based on master-slave control. In the method, a photovoltaic inverter of a photovoltaic power station is set on the master-slave control mode; the master inverter executes a maximum power tracking control method; a slave inverter executes a photovoltaic virtual synchrony control method; and, the power and the voltage when the master inverter acquires the maximum power point are sent to the slave inverter through communication, so that the slave inverter adjusts the step size of tracking and the parameter offrequency modulation. The method provided by the invention improves the prior photovoltaic virtual synchrony control method, so that the slave inverter is always in the state of frequency modulation;and thus, the frequency of the power grid can be better adjusted.

The invention discloses a method and a system for primary frequency modulation parameter self-adjustment control based on assessment data. The method includes the following steps: determining the primary frequency modulation qualification rate index standard value of a unit in a grid primary frequency modulation assessment system according to the running mode of the unit; comparing the primary frequency modulation qualification rate index standard value of the unit with the actual primary frequency modulation qualification rate index of the unit in the assessment system to get the primary frequency modulation qualification rate index deviation of the unit; and dynamically adjusting the primary frequency modulation power variation of the unit according to whether the primary frequency modulation qualification rate index deviation of the unit is beyond an adjustment scope, wherein the parameters of adjustment are set according to the active power variation index in the assessment system. The frequency modulation performance of the unit can be dynamically adjusted. The accuracy of response of the thermal power unit to primary frequency modulation scheduling is improved. The demand of the grid for the work of the unit primary frequency modulation action is satisfied. Safe and stable operation of the unit is considered while the frequency modulation ability is ensured.

The invention discloses a self-adaptive variable-parameter frequency modulation method and device for a doubly-fed variable-speed pumped storage unit, and the method comprises the steps: carrying out the frequency modulation parameter optimization of a unit under a plurality of typical working conditions with the rotation speed and power limitation as constraints, and generating a frequency modulation parameter upper limit curve under different working conditions in advance; the rotating speed, the frequency deviation and the frequency deviation change rate of the doubly-fed variable-speed pumped storage unit are detected in real time in the frequency modulation process, the corresponding frequency modulation parameter upper limit is obtained from the upper limit curve according to the rotating speed, the symbol is adjusted according to the frequency deviation change rate, and therefore frequency modulation parameters are obtained, stable operation of the unit in different states can be guaranteed, and the frequency modulation efficiency is improved. And the frequency modulation capacity of the unit can be utilized to the maximum extent, so that the unit has good frequency modulation performance under different working conditions and different operation states.

The invention discloses a high-power compact electro-hydraulic wind generating set assembly which comprises an impeller assembly, a hydraulic pump assembly, an oil tank and an electro-hydraulic all-in-one machine assembly contained in a cavity of an oil tank shell. The electro-hydraulic all-in-one machine assembly comprises a generator shell assembly, a rotor assembly, a stator assembly and a hydraulic motor assembly, the rotor assembly, the stator assembly and the hydraulic motor assembly are contained in a shell cavity of the generator shell assembly, the hydraulic pump assembly sucks oil from an oil tank shell cavity and/or a generator shell cavity, and the impeller assembly is connected with the hydraulic pump assembly. The hydraulic pump assembly outputs high-pressure oil to drive a hydraulic motor assembly and a rotor assembly in the electro-hydraulic all-in-one machine assembly to rotate, and power generation is achieved. The wind generating set disclosed by the invention is high in electro-hydraulic fusion, and has the characteristics of high power, compact structure, small volume, light weight, low noise, high efficiency, energy conservation, self-cooling, high power density, high reliability, long service life and the like.

The invention discloses a flywheel energy storage and lithium battery composite energy storage system and a working method thereof, and belongs to the technical field of energy storage. The system comprises a DC-AC module, a combined energy storage management system, DC-DC modules, a lithium ion battery energy storage unit and a flywheel energy storage unit. The lithium ion battery energy storage unit and the flywheel energy storage unit are respectively and correspondingly connected with DC-DC modules, all DC-DC modules are connected in parallel and then are connected with the combined energy storage management system, the combined energy storage management system is connected with the DC-AC module, and the DC-AC module is connected with an external power grid. Advantages of flywheel energy storage and the lithium battery can be brought into full play, parts borne by the flywheel energy storage and the lithium ion battery energy storage in different application scenes are optimized, performance advantages of the composite energy storage system are reasonably and efficiently matched and brought into full play, the peak and frequency modulation capacity of the energy storage system under complex conditions is greatly improved, and the defects of a single energy storage system are overcome.

The invention discloses an ACE-based electric heating heat storage and thermoelectric unit partition coordination control method, and belongs to the field of power system control. Building an electric heating heat storage and thermoelectric unit control model based on the ACE signal; the ACE signal is divided into a normal adjustment area, an emergency adjustment area and two adjustment dead areas, and different threshold values are set for different adjustment control areas; according to the comparison between the fed-back ACE signal and a threshold value, the adjustment control area is determined, when the ACE signal is in the normal adjustment area and the emergency adjustment area, the electric heating and heat storage system and the thermoelectric unit are used for adjustment and control, and when the ACE signal is in the two adjustment dead areas, the control center is used for adjusting and controlling the electric heating and heat storage system and the thermoelectric unit. According to the ACE-based electric heating and heat storage and thermoelectric unit partition coordination control method, electric heating and heat storage equipment can well cooperate with the thermoelectric unit. When the load continuously changes, the ACE partition control strategy can enable the system output power to meet the requirement of the load changing in real time for the power.