77results about How to "Improve primary FM performance" patented technology

The invention provides a coordination control method capable of enabling a super-capacitor energy storage system to participate in electric power primary frequency modulation, wherein the super-capacitor energy storage system is arranged on the bus side of a generator set which needs cooperation. A decision optimizing module obtains a frequency from a synchronous vector measurement unit, and the frequency deviation is obtained through the difference between the frequency and a 50Hz frequency. If the deviation exceeds a frequency dead band, the same motion instructions are simultaneously sent to a traditional generator set and the super-capacitor energy storage system. When the super-capacitor energy storage system participates in primary frequency modulation, the opportunity motion and the motion depth of the super-capacitor energy storage system are determined through the decision optimizing module according to partition of typical working conditions, the conversion from the frequency deviation to the power is achieved through a power-frequency conversion module, the charging/discharging control of the super-capacitor energy storage system is achieved through a PCS control module, and finally the traditional generator set is assisted in participating in the primary frequency modulation process. According to the coordination control scheme, the transient state performance and the steady-state performance of the primary frequency modulation can be obviously improved, frequent starting of the traditional generator set is reduced, and the power system frequency can be rapidly kept stable.

The invention discloses a main steam pressure change-based thermal power generating unit load control method, which comprises the following specific implementation steps of: (1) taking unit given load as pure proportional steam turbine master control proportion feed-forward input quantity through a proportional component; (2) taking the unit given load as steam turbine master control differential feed-forward input quantity; and (3) summing unit given load dynamic results generated by the step (1) and the step (2) through the proportional element and a differential element respectively and providing to the steam turbine master control PID (Proportion Integration Differentiation) regulating step as feed-forward FF input quantity. The main steam pressure change-based thermal power generating unit load control method has the beneficial effects that the control problems of quick response and the like when the thermal power generating unit is put in the AGC (Automatic Generation Control) mode can be solved through implementation, the requirement of a power grid on the unit AGC can be effectively met, and the requirements of frequency modulation and peak regulation are met.

The invention discloses a method for detecting primary frequency modulation capacity of power system units. The method includes: using WAMS (wide area measurement system) time sequence real-time library data to detect whether a primary frequency modulation event occurs or not; using the WAMS time sequence real-time library data to count unit operation time and design a visualized man-machine interface. By the method, the problem that a scheduling center cannot learn about the primary frequency modulation capacity of each unit in real time when power grid frequency is abnormal is solved. The fast and efficiency method is provided for power grid scheduling operators to detect the primary frequency modulation capacity, monitor the primary frequency modulation capacity of the units in real time, and increased the primary frequency modulation capacity of the units.

The present application relates to an energy storage battery-based control method and system for primary frequency regulation of a power grid. The method comprises the following steps: in step S1, when power disturbance occurs in an electric power system, whether to switch on the energy storage battery to participate in the primary frequency regulation of the power grid according to frequency deviation of the electric power system; in step S2, when the frequency deviation of the electric power system falls within an allowed range of power grid frequency deviation, a control mode of the energystorage battery participating in the primary frequency regulation of the power grid is determined based on magnitude of the frequency deviation of the electric power system and a state of charge of the energy storage battery; in step S3, if the frequency deviation of the electric power system exceeds the allowed range of the frequency deviation of the power grid, virtual droop control and virtualinertia control work together to participate in the primary frequency regulation of the power grid. The method and system disclosed in the invention can help solve a problem that secondary fall of system frequency occurs and the energy storage battery is short in service life during the primary frequency regulation of the power grid via energy storage battery control technologies based on combination of the virtual droop control and the virtual inertia control.

The invention discloses a primary frequency modulation online self-tuning controller and control system for a generator set and a method of the primary frequency modulation online self-tuning control system for the generator set, wherein the controller comprises a power network frequency deviation calculation module used for obtaining deviation between power network real-time operation frequency and power network reference frequency to obtain network frequency deviation, a frequency modulation compensation command function F(x) module used for calculating a primary frequency modulation load compensation command function F(x) of the generator set according to the network frequency deviation and set revolving speed diversity factors, and sending the primary frequency modulation load compensation command function F(x) of the generator set to a self-calibration algorithm control module and a command correction MUL module respectively, the self-calibration algorithm control module used for calculating a primary frequency modulation command correction coefficient and the command correction MUL module used for receiving the primary frequency modulation correction coefficient output by the self-calibration algorithm control module, and correcting the primary frequency modulation load compensation command function F(x) of the generator set to obtain a primary frequency modulation actual motion compensation command of the set, and finally sending the primary frequency modulation actual motion compensation command of the set to a set load control system.

The invention provides a quick frequency response control method and device for a new energy power generation unit. The active power of the new energy power generation unit is determined through a boxtransformer measuring and control device; the determined active power distribution value is sent to a photovoltaic inverter or a draught fan converter through the box transformer measuring and control device; the photovoltaic inverter or the draught fan converter generates power according to the active power distribution value, and not only are the workload and cost reduced, but also the frequency response time of the new energy power generation unit in a new energy station is shortened; the active power of a photovoltaic power station can be quickly controlled, the response time is within five seconds, and a step of direct communication between a controller and the inverter is omitted; signals of voltage, current, power, frequency and the like, originally collected by the box transformermeasuring and control device, of a transformer can be utilized for direct quick frequency response control, hardware equipment does not need to be additionally arranged, quick communication control is ensured, and the cost can be effectively reduced.

The invention discloses an online statistical analysis technique for generator set primary frequency modulation performance abnormity. The method comprises the following steps: selecting typical primary frequency modulation events beneficial for improving precision through generator PMU measured data obtained online, calculating primary frequency modulation contribution rate of a corresponding set, calculating actually measured average speed change rate by adopting an integral algorithm, screening out reasonable primary frequency modulation performance evaluation results by using a reasonable data range and normal distribution variance, and shielding the influences of disturbance and secondary frequency modulation on primary frequency modulation performance evaluation; and then giving an alarm for primary frequency modulation abnormity of the set according to the difference between the two indexes and a reasonable value and a preset value and the change relative to historical value. Operating personnel can discover the generator sets with the problem of primary frequency modulation in time according to the calculation results and alarm information, good primary frequency modulation performance of the generator sets can also be promoted to be maintained, and safe and stable operation of grid frequency is maintained together.

The present invention discloses a method and a system of hydraulic governor parameter setting based on sensitivity analysis. The method comprises the steps of: calculating a frequency response coefficient of a load of an asynchronous networking sending-end system; establishing a water turbine system open-loop transfer function, and solving a corresponding step response function; establishing a state-space equation of a water turbine in the asynchronous networking and a speed regulation closed-loop system thereof according to the calculated frequency response coefficient, and solving the maximum feature value of the real part of the established state-space equation and a corresponding damping ratio; performing feature value sensitivity analysis of the water turbine and the closed-loop system thereof according to the established state-space equation and the maximum feature value of the real part; and combing the solved step response function and the solved damping ratio according to a feature value sensitivity analysis result, taking the optimal primary frequency modulation motion feature of a hydraulic turbine-generator set in the step response as a target, and performing iterationsolution of an optimal parameter of the hydraulic governor. The method and the system of hydraulic governor parameter setting based on sensitivity analysis are high in robustness and good in primary frequency modulation performance and can be widely applied to the field of electric system.

The invention discloses a hydraulic turbine governor parameter tuning method based on state space analysis and system. The method comprises steps: the frequency response coefficient of an asynchronousinterconnection transmitting end system load is calculated; a hydraulic turbine system open-loop transfer function is built, and a corresponding step responding function is solved; according to the calculated frequency response coefficient, state space equations for the hydraulic turbine under asynchronous interconnection and the speed regulation closed loop system are built, and the maximum eigenvalue of the real part of the built state space equations and the corresponding damping ratio are solved; according to the solved step responding function, the built state space equations and the damping ratio corresponding to the maximum eigenvalue of the real part of the state space equations, a penalty function method is adopted to build a particle swarm fitness function; and according to theparticle swarm fitness function, with the optimization of primary frequency modulation action characteristics of a hydroelectric generating unit under step response as a goal, and a particle swarm optimization algorithm is used to solve the optimal parameters of the hydraulic turbine governor. The robustness is strong, the primary frequency modulation performance is good, and the method and the system can be widely applied to the power system field.

The invention discloses a storage capacity optimal allocation method based on improved primary frequency modulation, belongs to the field of grid frequency modulation and is intended to provide a storage capacity optimal allocation method to reasonably plan and allocate the capacity of an energy storage system in order to solve the problem that the energy storage system has relatively high cost. The method herein comprises: S1, providing a capacity optimal allocation model, and calculating standard deviation R of grid frequency values at different moments according to sampling data; a) if thestandard deviation R increases, controlling storage output to carry out frequency modulation until the standard deviation R decreases; b) if the standard deviation R decreases, detecting SOC (stage ofcharge) of an energy storage battery; S2, detecting the SOC of the energy storage battery, wherein an SOC value of energy storage being in an interval near SOCref is most favorable for energy storageoperation; setting the interval to [SOC1, SOC2]; c), if the SOC value is not within [SOC1, SOC2], performing extra charging-discharging on the energy storage battery until the SOC value is within [SOC1, SOC2]; d) if the SOC value is within [SOC1, SOC2], calculating a storage capacity value according to a storage capacity calculating method.

The invention relates to a primary frequency modulation method for correcting valve flow characteristic deviation, which comprises the following steps: resolving an original primary frequency modulation function curve into four function curves, including a positive frequency modulation function curve, a negative frequency modulation function curve, a positive valve opening correction factor curve and a negative valve opening correction factor curve, wherein the positive and negative frequency modulation function curves are corresponding to the valve opening value of the frequency modulation load, and the positive and negative valve opening correction factor curves are corresponding to the correction factor; multiplying the valve opening value and the correction factor to obtain an accurate valve opening variation corresponding to the frequency modulation increment, and adding the valve opening variation to the original valve opening value to increase or reduce the valve opening value, thereby enhancing or lowering the steam inlet amount and further increasing the generating load of the set. The accurate sectionlization on the original primary frequency modulation function curve and the overall process correction on the valve opening correction factor are performed to effectively enhance the primary frequency modulation property.

The invention discloses a multivariable fitting-based parameter optimization modeling method for a generator speed regulating system. The method comprises the following steps: firstly, by a multivariable fitting method, fitting the relationship between three performance indexes, namely percent overshoot, rise time and regulating time, of primary frequency modulation of a generator and four control parameters, namely unit regulation power, a hydraulic servo-motor time constant, a turbine steam time constant and a generator inertia time constant; with the obtained multivariable fitting formula of the primary frequency modulation as an equality constraint, control parameter value ranges and other conditions as inequality constraints and the optimal primary frequency modulation performance of the fine speed regulating system as a final target, searching the speed regulating system parameter with the optimal primary frequency modulation performance by a multi-target and multi-constraint nonlinear optimization method; and building an optimized generator speed regulating system model.

The invention discloses a method for improving microgrid energy storage primary frequency modulation performance. The method comprises the following steps of: establishing a VSG rotor mechanical equation and a reactive voltage regulation equation of an energy storage microgrid grid-connected inverter virtual synchronous machine; introducing a virtual speed regulator into a rotor mechanical controllink; acquiring an active frequency variation equation; acquiring a VSG steady-state primary frequency modulation droop equation; acquiring a dynamic virtual inertia and a virtual damping coefficient; introducing the obtained dynamic virtual inertia and virtual damping coefficient into the VSG rotor mechanical equation of the energy storage microgrid grid-connected inverter, and introducing a dynamic virtual damping coefficient into a VSG steady-state primary frequency modulation droop equation, thereby achieving the purpose of improving the primary frequency modulation performance of microgrid energy storage. The VSG control strategy is adopted in the microgrid energy storage primary frequency modulation control system, inertia and damping support can be provided for a power grid, and the primary frequency modulation performance is good.

The invention discloses a primary frequency modulation method of a thermal power generating unit with no dead zone and automatically variable speed regulation. The primary frequency modulation capacity of a thermal power generating unit requires further improvement to fulfill the background requirements of ultra-high voltage power transmission landing, progressively increasing new energy occupation, large-scale transformation of the economic structure and the like. According to the method, an automatically sampled function is constructed for the speed regulation by eliminating a dead zone on the full frequency domain, so that part of serious work conditions in the dead zone can be screened and subjected to frequency modulation, and the speed regulation out of the dead zone is linearly changed along with frequency, and the influence of main steam pressure and temperature is concerned. According to the method, the primary frequency modulation capacity of a thermal power generating unit can be improved, the damage of a speed regulation system due to over-frequent operation cannot be caused, and the stable safety performance of the unit cannot be reduced.

The invention relates to the automatic control field of power plants, particularly to a primary frequency modulation method of a generator set. A primary frequency modulation method of a single-shaft combined cycle unit of single-burning low heat value blast furnace gas comprises the steps of firstly collecting the frequency difference of power grids in real time and converting the frequency difference into a load response required value, judging and obtaining the actual load value according to the limiting conditions; then overlaying the actual load response value and the actual load data, and converting the overlaid result into the adjusted value of a full static blade angle after correction, thereby adjusting the fuel flow so as to change the load of the unit; in case one of the following two conditions is met, the operation of primary frequency modulation is finished; 1) the exhaust temperature of a gas turbine reaches the upper limit value of the exhaust temperature of the gas turbine, and at same time the inlet guide vane angle of an air compressor reaches the maximum opening degree; 2) the adjustment of the full static blade angle is finished according to the adjusted value. In the invention, the full static blade angle is adjusted by using the corrected load difference according to the characteristics of the blast furnace gas, and the load response requirement of the primary frequency modulation of the unit is met.

The invention provides a primary frequency modulation control method and device. The method comprises the following steps: acquiring real-time process control data of a unit running under each load section working condition; according to the real-time process control data and a pre-established frequency modulation characteristic relationship prediction model, obtaining an optimal frequency modulation characteristic relationship of the unit running under each load section working condition, and obtaining an optimal frequency modulation characteristic relationship of the unit running under a full-load working condition; correcting parameters of the primary frequency modulation control system according to the optimal frequency modulation characteristic relationship of the unit running under the full-load working condition to perform primary frequency modulation control. According to the method, the optimal frequency modulation characteristic relationship of the unit running under the full-load working condition is obtained according to real-time process control data; the parameters of the primary frequency modulation control system are corrected according to the optimal frequency modulation characteristic relationship, and the primary frequency modulation control is carried out, so primary frequency modulation can be adjusted according to the optimal frequency modulation characteristic suitable for a real-time state, the primary frequency modulation capability of the unit is improved to the maximum extent, and the stability of a power grid is improved.

The embodiment of the present application illustrates a method for optimizing governor parameters of a large hydropower unit, the method comprises the steps of establishing a single unit load model for the unit to be optimized; calculating the rated power of the optimized unit according to the single-unit load model; at the rated power condition, adjusting the PID parameters of the system one by one to obtain the optimal parameters under stable conditions, wherein the PID parameters include: proportional gain KP, integral gain KI, and differential gain KD. The technical scheme shown in the embodiment of the present application makes the speed regulating system PID parameters of the unit to be optimized to critically stable by making full use of the unit damping coefficient, so that the PIDparameters of the speed regulation system parameters of the unit to be optimized reach critical stability. Under the condition of not providing negative damping to the system, the primary frequency modulation performance of the unit can be improved to the maximum extent.