338results about How to "Improve dynamic response characteristics" patented technology

The invention discloses an automatic regulating apparatus for controller parameters of a servo driver of a motor and a method thereof. The apparatus comprises an inertia identifier, a parameter initial regulator, a parameter checker, a parameter optimizer, a parameter saving and displaying device, a speed controller, a position controller, a torque controller, a PWM (Pulse-Width Modulation) generator and a coded disc. In the invention, the servo driver of an alternating current permanent magnet motor automatically configures the parameters of the position controller and the speed controller according to different rotary inertias of mechanic load, checks and further optimizes the automatically configured parameters through the parameter checker and the parameter optimizer so that the position response and the speed response of the servo driver are relatively optimal. The servo driver of the alternating current permanent magnet synchronous motor automatically regulates the control parameters according to work occasions and achieves ideal control effect. The whole process is manual participation free and completed fully by the servo motor of the alternating current permanent magnet synchronous motor.

The invention relates to a single-phase universal electric energy quality controller for power supply for electrified railways, and belongs to the technical field of flexible AC power transmission and distribution; the invention comprises a single-phase multi-coil transformer composed of a primary coil and n secondary coils, so that the secondary coils of the transformer can be connected in parallel with n voltage sources of current transformers; n capacitors are connected with n voltage source current transformers, so as to form a single-phase chain-type H-bridge current transformer with n chains; the AC terminal of the H-bridge current transformer is directly connected with the traction grid through a reactor. The invention has the functions of active power control, reactive power compensation and harmonic compensation, so as to resolve three-phase voltage unbalance, voltage fluctuation, low power factor and harmonic pollution and so on that exist in ER traction transformer stations, effectively lower the capacity of traction transformers, increase ER transport capacity and transportation capability. Moreover, the invention is characterized in small occupied area, little loss and low cost, in order to gain perfect harmonic suppression characteristics and dynamic response features, and provide convenience in industrial production and improve device reliability.

The invention discloses a direct current voltage deviation slope control method for a multi-end flexible direct current power transmission system. By using the direct current voltage deviation slope control method, direct current voltage of the system is stabilized within a power running range by taking a converter station as a direct current voltage main control station in the multi-end flexible direct current power transmission system; a plurality of other converter stations are connected with an active network; and by combining a deviation characteristic of a direct current voltage deviation control mode with a slope characteristic of a direct current voltage slope control mode, a plurality of converter stations have tide adjusting capacity and transient quick direct current network power stabilization capacity. By using the method, the direct current voltage deviation control mode and the direct current voltage slope control mode are combined, active power can be adjusted in the transient state of the converter stations according to the deviation characteristic of the direct current voltage deviation control mode, and the converter stations can realize functions of preparing fixed direct current voltage according to the slope characteristic of the direct current voltage slope control mode; and the dynamic response of the system is accelerated.

The invention discloses a high-sensitivity capacitive flexible tactile sensor based on a three-dimensional porous microstructure composite dielectric layer and a manufacturing method thereof. The upper and lower surfaces of a three-dimensional porous microstructure composite dielectric layer are orderly provided with flexible isolation layers, flexible plates and flexible protection layers. According to the three-dimensional porous microstructure composite dielectric layer, a graphene / multi-wall carbon nanotube / silicone rubber conductive composite material is used as a force sensitive composite material, and dipping and coating the graphene / multi-wall carbon nanotube / silicone rubber conductive composite material at a polyurethane sponge three-dimensional framework surface layer, the three-dimensional porous microstructure composite dielectric layer is obtained through self-assembly. The capacitive flexible tactile sensor of the invention has good flexibility, detection sensitivity anddynamic response characteristics, and a design idea is provided for the design of the highly-sensitivity flexible tactile sensor for an electronic skin application of an intelligent robot.

The invention discloses a permanent magnet synchronous motor maximum torque per ampere control method based on parameter self-correction. Real-time estimation is carried out on change condition of motor parameters (permanent magnet flux linkage, d-axis inductance and q-axis inductance) through utilization of a feedforward compensation control module; further online correction is carried out on themotor parameters in a torque equation; an electromagnetic torque model comprising accurate motor parameter information is obtained; a torque to current angle change rate is directly solved through utilization of the model; further an MTPA (Maximum Torque Per Ampere) angle is computed; and precise maximum torque per ampere control is realized. When motor operation condition is changed, according to the method, the MTPA angle can be directly solved through mathematical operation, so influence of system bandwidths does not need to be taken into consideration; an algorithm simple; computing speedis fast; dynamic performance is relatively good; a motor is enabled to work at the maximum torque per ampere operation point all the time; influence of the operation condition and motor parameter change is avoided; and relatively good parameter robustness and dynamic response characteristic are achieved.

The invention relates to a unified power energy quality controller based on the serial-connection multiplicity of transformers and a chain structure, which belongs to the technical filed of flexible AC transmission and distribution of an electric power system and the power electronic. The unified power quality controller comprises a single-phase serial-connection multiple transformer bank and a single-phase chain H bridge converter, wherein the transformer bank consists of m single-phase transformers which form the serial-connection multiple transformer bank together with n voltage source converters connected with n secondary windings of m single-phase transformers respectively; the single-phase chain H bridge converter is provided with n chains and is formed by connecting n DC voltage supporting units and n power source converters, and an AC port of the n-chain single-phase chain H bridge converter is directly connected with the electric fence through a reactor, m and n are signless integrals equal to or more than 2, and m is less than or equal to n. The invention can realize accurate current control, has high dynamic responding speed, and can solve the problems of the traction substation of an electrified railway that the three-phase voltage is unstable and fluctuates, the power factor is low and the harmonic pollution exists, and the like.

The invention discloses a parallel inverter current control method adopting voltage differential compensation, which comprises: adopting a LCL wave filter composed by capacitor and damping resistor in series connection to connect with a PWM inverter and power network; adopting a current transmitter to detect the current in the inductor on the power network side of the wave filter and obtain power network current signal; adopting a piezoelectric sender to detect the capacitor branch voltage of the wave filter and obtain current compensation signal by the RC differential circuit; combining the two signals into one signal as a feedback signal for current control of the inverter; comparing with the control given signal of the power network current to obtain error signal; and adjusting and controlling the output of the PWM inverter by proportional integration, wherein, the transformation ratio of the piezoelectric sender and the RC differential time constant are determined by the LCL wave filter parameter. Compared with conventional current feedback control methods, the invention can reduce the damping resistance of the LCL wave filter, thereby reduce the loss caused by damping resistance and improves the ability of the wave filter for inhibiting the ripple current of the inversion switch.

This invention relates to whole digital buried arc welding varying wire feed control method, which adopts series three-loop control structure with inner one as current ring, second ring as rotary speed ring and outer ring as arc voltage ring with one adjustor in each ring for arc voltage, rotation speed and current. It adopts high speed digit signals processor as central control part to form whole digital DC servo motor control system whose all control strategies area realized by software and the hardware completes digital trigger function and signal process function.

This invention discloses a method for controlling current of interconnected inverters applying current feed back, in which, a low-pass filter connected between the inverted output and a network applies a T-type circuit composed of inverse side serial inductors, two parallel by-pass capacitors and network side serial inductors, the capacitance ratio of the two by-pass capacitors is in inverse ratio to the inductance of the adjacent filter inductance and utilizes a current converter to test the current between the two by-pass capacitors and takes it as the feed back signal for the inverse output current control to be compared with the given signal of the network current then to be input into a ratio integral adjuster and takes the output signal after the adjustment as the pulse width modulation signal operated by the inverse switch to control the output waveforms and amplitude value of the interconnection inverter.

The invention discloses a bottom pre-tensioning type stick-slip driving cross-scale precision motion platform which comprises a base, a friction oscillator, an oscillator driving source and a sliding block, wherein a pre-tensioning force adjustment structure for providing pre-tensioning force is arranged between the bottom of the sliding block and the base; the pre-tensioning force adjustment structure comprises a V-shaped spring for providing the pre-tensioning force and an adjustment screw used for adjusting the V-shaped spring; the V-shaped spring is mounted on the base in a compression and deformation manner through the adjustment screw; the pre-tensioning force adjustment structure is used for adjusting the pre-tensioning force; a stick-slip effect occurs between the sliding block and the friction oscillator; and the sliding block performs cross-scale precision motion. According to the bottom pre-tensioning type stick-slip driving cross-scale precision motion platform, an adjustment manner of the pre-tensioning force of the motion platform is greatly simplified, and processing and assembly are facilitated, so that the output performance of the stick-slip driving cross-scale precision motion platform is effectively improved, the motion precision and consistency of the stick-slip driving cross-scale precision motion platform can be guaranteed simply and effectively, and the motion platform is suitable for batch production.

The invention respectively adopts a direct energy balancing mechanism to realize the dynamic decoupling between a steam turbine power regulating loop and a boiler burning regulating loop and a direct mass (flow) balancing mechanism to realize the dynamic decoupling between a steam turbine power regulating loop and a boiler water supply regulating loop, and decouples a usual direct current boiler unit 3*n multi-variable parallel control system onto a decoupling control loop in a hierarchical control structure. The boiler burning regulating loop cancels an usual front side pressure series regulator, and takes the enthalpy increased deviation of an evaporation heated surface of a boiler as the control input; and the boiler water supply regulating loop is designed into fuel-water ratio regulation with a steam turbine power instruction as the input; and the dynamic compensation between boiler burning and water supply is designed. The method best eliminates the coupling impact among all the regulating loops, so that the adjustment is convenient, and the control quality of the direct current furnace unit coordinating control system under the working conditions of variable pressure and variable load is improved.

The invention discloses a method for controlling the frequency modulation of a micro-grid battery energy storage system based on fuzzy control, and belongs to the technical field of electric power system micro-grids. On the basis of the conventional proportion integration differentiation (PID) control, fuzzy control and an implementation mode thereof are introduced into the method, and the method comprises important components such as fuzzification, fuzzy rules, fuzzy reasoning, defuzzification, PID control and the like. According to the method, the micro-grid frequency deviation and the micro-grid frequency change rate are fuzzified into input of a fuzzy controller, PID control parameters of active power output control are output according to a fuzzy control rule, and an active power output reference value Pref of the battery energy storage system is finally output to control the active power output of the micro-grid battery energy storage system. Compared with the conventional PID control, the method has very strong adaptability to the switching of micro-grid parallel network / isolated network operational modes and to the nonlinearity and the time variability of electric network operational parameters, has a good dynamic response characteristic, and effectively improves the active power control accuracy of the battery energy storage system and the frequency stability of the micro-grid.

The invention discloses a delayless control method of rotor current of a grid-connection, speed-change and constant-frequency double-fed induction wind driven generator (DFIG). The conversion of a rotational coordinate is carried out by collecting three-phase rotor current signals, the feedback quantity of rotor current in a corotation synchronous-speed rotating coordinate system is obtained and is compared with a rotor current command in the same coordinate system, an error signal is inputted into a proportional-integral-complex coefficient resonance regulator for regulation, and the rotor reference voltage in the corotation synchronous-speed rotating coordinate system is obtained after feedback compensation decoupling and then converted into the rotor reference voltage used for space vector pulse width modulation (SVPWM) in the rotor coordinate system to generate a switching signal of a power device of a rotor side convertor so that DFIG grid-connected operation can be controlled. The method does not need to carry out positive and negative sequence decomposition of rotor current under balanced or unbalanced grid voltage, can not introduce decomposition time delay and can realize the reinforced control target of a power generation system under the unbalanced grid voltage, thereby effectively increasing the ride-through (uninterrupted) operation capability of a wind power system under power grid failure.

A multi-model dynamic soft measuring modeling method comprises the steps of establishing multiple sub models by utilizing a self-adaptive fuzzy core clustering method and a least square support vector machine; then taking a probability distribution function constructed by a proof synthesis rule as a weight factor to perform fusing on sub model output to obtain the output of multiple models; finally performing dynamic estimation on predicted errors of the multiple models by combining an autoregression moving average model.

The invention discloses a method for controlling asymmetric direct power of doubly-fed asynchronous wind power generators. The method comprises the following steps that: by collecting voltage and current signals of a three-phase stator of a DFIG, instantaneous active power and reactive power output by the DFIG stator are calculated; error signals between the instantaneous active / reactive power of the stator and given active / reactive power are regulated by utilizing a proportional regulator and two resonant regulators; output signals of the three regulators are added and then decoupled through feedback compensation so as to obtain a reference voltage signal of a rotor in a rotor-speed rotational coordinate system; a switching signal of the operation of a rotor-side converter is generated through space vector pulse-width modulation so as to control the operation state of the DFIG; and the method can eliminate fundamental-frequency fluctuation and double-frequency fluctuation in the output power of the stator, which are caused by voltage asymmetry of power networks, and does not need to decompose positive / negative-sequence components, thereby avoiding introducing decomposition time delay and errors. Therefore, the method can enhance the capability of controlling wind power generating sets under the circumstance that the power networks have asymmetric faults, and improve the uninterrupted operation capability of the wind power generation systems with the faults.

The invention provides an auxiliary primary frequency modulation and optimization control method for battery energy storage systems. The auxiliary primary frequency modulation and optimization control method is characterized by comprising the following steps: obtaining the power shortage and the power grid frequency deviation change rate of primary frequency modulation; obtaining the modulation proportional coefficient of the battery energy storage system; computing the output power value of the battery energy storage system, determining the amendment opportunity and the amendment degree of the battery in a charging state, and amending. According to the method provided by the invention, the deficiency that a generator unit is insufficient in power change is made up; and the energy storage system is rapid in response speed, thus facilitating the faster recovery of power grid frequency. After the frequency modulation is completed, on the premise that the power grid frequency is not caused to cross a dead zone, SOC of the battery is corrected, next smooth frequency modulation process is ensured, the situation of time-of-use electricity price is comprehensively considered, charging cost for energy storage is reduced, and back discharge proceeds are increased.

The invention discloses a bi-directional power converter control method based on a virtual synchronous motor, and relates to the field of bi-directional power control in alternating-current and direct-current mixed micro-grids. A bi-directional power converter is of a three-phase three-leg structure formed by a switch tube and provided with a direct-current-side capacitor and an alternating-current-side filter inductor, alternating-current-side output voltage of the bi-directional power converter is equivalent to exciting electromotive force of the synchronous motor, alternating-current-side grid voltage is equivalent to terminal voltage of the synchronous motor, filter inductance is equivalent to armature winding of the synchronous motor, the bi-directional power converter can serve as the virtual synchronous motor after equivalence is achieved, an inertia simulation unit of the bi-directional power converter is provided with the direct-current-side capacitor, bi-directional transmission of energy is achieved by the aid of a virtual frequency controller, a virtual excitation regulator and a virtual motor control unit, direct-current voltage variation and alternating-current frequency fluctuation are decreased, the bi-directional power converter has a certain inertia, dynamic response of a system is improved, and the stability of the system is improved.

The invention discloses a one-phase open-circuit fault-tolerant direct thrust control method for a five-phase permanent magnet linear motor. Firstly, a Clark transform matrix and an inverse matrix thereof are derived based on fault-tolerant phase current. On the above basis, a stator flux linkage on alpha-beta is derived, a stator virtual flux linkage is defined according to the requirements of acircular stator flux linkage trajectory, and thus the voltage compensation on alpha-beta is derived. The stator actual voltage on the alpha-beta is derived by a modulation function of a voltage sourceinverter, and voltage is combined with voltage compensation and stator current, and a stator virtual flux linkage and thrust are observed by a stator flux observer and a thrust observer. Then statorvirtual target votlage is calculated according to given thrust, a given stator flux linkage amplitude and the observed stator virtual flux linkage and thrust. Finally, the stator actual voltage is calculated by the voltage and the voltage compensation, and the motor is controlled by the voltage by the voltage source inverter. According to the method, a thrust fluctuation caused by a motor failureis suppressed, and more importantly, the dynamic performance and steady state performance are consistent with that in a normal condition.

The invention discloses a six-free-degree 3-3 orthogonal type parallel robot which comprises a motion platform, a fixed framework and a mechanical branch chain set, wherein the mechanical branch chain set is arranged between the motion platform and the fixed framework and connected with the motion platform and the fixed framework, the mechanical branch chain set comprises six mechanical branch chains in 3-3 orthogonal arrangement. The 3-3 orthogonal arrangement refers to that the six mechanical branch chains are divided into two sets, and each set comprises three mechanical branch chains. The axes in the three driver directions of the three mechanical branch chains in the first set are positioned in the same plane surface, and each two axes form a 120-degree angle but do not cross at one point; the axes in the three driver directions of the three mechanical branch chains in the other set are parallel to one another, but do not in the same surface, and the axes are in pairwise orthogonal with the axes in the direction of the three mechanical branch chains in the first set. The six-free-degree 3-3 orthogonal type parallel robot provided by the invention has the advantages of high system rigidity, high positioning accuracy, excellent dynamic response property, excellent isotropy of mechanical properties such as rigidity, bearing and the like, small occupied space, low energy consumption, long service life, low manufacturing cost, less maintenance cost, zero contamination and the like.

The invention discloses a controlled perforation plasma-arc welding system on the basis of back small-hole visual inspection. The controlled perforation plasma-arc welding system comprises a welding machine system, an electric parameter acquisition system, a visual sensor system and a regulation and control system. The invention further discloses a controlled perforation plasma-arc welding process on the basis of the back small-hole visual inspection. The controlled perforation plasma-arc welding process includes the following steps: (1) starting: selecting appropriate current waveform parameters according to texture and plate thickness of materials to be perforated; and (2) starting welding after the parameters are selected and set, acquiring current waveforms and back small-hole images in real time, transmitting the information to a computer, calculating the size of a small hole, and calculating deviation of the size of the small hole and a set value until welding is finished. The controlled perforation plasma-arc welding system and process on the basis of the back small-hole visual inspection enables a one-pulse and one-hole welding mode to be expanded from welding of stainless steel sheets with thickness less than 4mm to welding of middle thickness plates with 8mm thickness, guarantees perforation of workpieces, enables the size of the small hole to be maintained at a value nearby a predetermined value, and effectively prevents a furnace hearth from collapsing and being burnt through.

The invention discloses a self-adaptive correcting method for dynamic accelerating feedforward signals of a supercritical boiler. By adopting the method, the dynamic accelerating feedforward signals of the supercritical boiler during the load verifying process of the supercritical boiler can be intelligently and self-adaptively adjusted according to the real-time load deviation, the change rate of the temperature along with the load and time and the change rate of the pressure along with the load and the time, and the dynamic accelerating feedforward signals can be amplitude limited according to the safety allowance of the intermediate point temperature, as a result, the compensating precision of the dynamic accelerating feedforward signals is effectively improved, and overcompensation and boil overtemperature are avoided.

The invention discloses a stick-slip driving cross-scale precise motion platform which comprises a base, a friction vibrator, a vibrator driving source and a sliding block, wherein the friction vibrator is mounted on the base; the vibrator driving source is mounted between the friction vibrator and the base and provides a driving force for the friction vibrator; the sliding block is connected with the friction vibrator in a sleeving manner, and contacted with the friction vibrator to generate a friction force; a pretightening force adjustment structure for providing a pretightening force is arranged between the side surface of the sliding block and the base, and used for adjusting the magnitude of the friction force; a stick-slip effect is generated between the sliding block and the friction vibrator; and the sliding block makes cross-scale precise motion. According to the stick-slip driving cross-scale precise motion platform, an adjustment mode of the pretightening force of the motion platform is simplified greatly; processing and assembling are facilitated; the output performance of the stick-slip driving cross-scale precise motion platform is further improved effectively; the motion precision and the consistency of the stick-slip driving cross-scale precise motion platform can be guaranteed simply and effectively; and the stick-slip driving cross-scale precise motion platform is suitable for mass production.

This invention relates to a method for controlling the temperature of continuous annealing heating oven. The entrance temperature of the oven, belt steel flow rate of a second and oven temperature are used as the input to calculate the optimal gas flow increase, and the oven temperature can be comtrolled by adjusting the gas flow increase. This invention considers the influences of belt steel thickness, width, flow rate and the entrance temperature to the oven temperature, and increases the accuracy and dynamic responsivity of the oven temperature control.

The invention discloses a nondelay control method for the current of the rotor of the variable speed constant frequency double feed nonsynchronous aerogenerator(DFIG). The transformation of coordinates of static three phase / two phase of the rotational coordinate is finished by collecting three phase rotor current signal so as to obtain the rotor current feedback amount in the static frame of axes to compare with the rotor current command in the stator static frame of axes, the difference signal is input into the proportion-resonance regulator for comparison, the rotor voltage reference value in the stator static fame of axes is obtained after feedback compensation decoupling. The rotor voltage reference value is then transformed into reference signals for space vector pulse width regulation in the rotor frame axes to generate switch signals of the power components of the converter of the rotor to control the synchronize and close operation of the generator. The invention is needless of the break down of the positive and negative sequence of current of the EFIG rotor no matter the electric net voltage is balance or not without introducing break down delay. The invention can realize strengthened control of the generating system in imbalanced electric net, effectively improve non-stop operation of the aerogenerator.

The invention discloses a method for controlling rotor current of an AC excitation asynchronous doubly-fed induction generator (DFIG) without time delay. The method comprises acquiring a three-phase rotor current signal to perform rotational coordinate conversion to obtain rotor current feedback quantity in a positive rotation synchronous rotating coordinate system, compared with the rotor current command in the same coordinate system, inputting the error signal to a proportion-integral regulator for regulation, performing feedback compensation and decoupling to obtain rotor reference voltage in the positive rotation synchronous rotating coordinate system, converting to the rotor reference voltage for space vector pulse width modulation in a rotor coordinate system, and generating a switching signal for power devices of a rotor side transformer to control on-line operation of DFIG . The inventive method does not require performing positive and negative sequence decomposition of rotor current neither under balanced network voltage nor under imbalanced network voltage, and does not cause decomposition delay, so as to realize enhanced control target of the power generation system under imbalanced network voltage and effectively improve the uninterrupted operation (passing through) ability of the power generation system under network failure.

The invention discloses an asymmetry coordination direct power control method of a double-fed asynchronous wind power generation system, which adjusts the stator electromagnetism and the reactive power as well as active power and reactive power of a grid side convertor of a double-fed asynchronous generator through a proportional resonance regulator consisting of a proportional regulator and two resonance regulators so as to effectively control the operation sate of the double-fed asynchronous generator and the grid side convertor under the condition without positive sequence and negative sequence current quantity decomposition. The invention can realize the integral optimized control effect of the double-fed asynchronous wind power generation system under the condition of asynchronous failures of an electric fence, eliminates total active and reactive power, electromagnetic torque, and DC bus voltage fluctuation of the doublefed asynchronous wind power generation system because of asymmetrical voltage of the electric fence, effectively improves the operation control property of the double-fed asynchronous wind power generation system under the condition of the voltage failure of the electric fence, and ensures the electric energy quality of power supply and the operation stability and the operation safety of an electricity system.

The invention of a high frequency response high temperature drag-twist fatigue extensometer belongs to modified technique of drag-twist fatigue tester including displacement sensor and dual-direction two liver mechanism which includes two inisopachous wall right angle type stressedpiston installed symmetrically with facing ends of vertical thick walled board linked with a quartz thimble separately and drag-twist atresser, torsion moment measuring machine, stretching tester linked successive towards outer with two thin walled boards. The drag-twist atresser includes two rotating shafts, spring slice and support stick linking to it, the torsion moment tester in stretching tester includes rotation reflecting plate and torsion moment displacement senser and the stretch tester includes axial reflecting plate and axial displacement sensor. The invention has the advantages of simple installation, fast dynamic response of measurement, small temperature drift, wide measuring range, long life and high accuracy.

The invention discloses an MMC (modular multilevel converter) harmonic circulating current restraining and direct-current power fluctuation restraining method. The method includes a modulation link based on submodule voltage estimation and a proportional control link based on direct-current fluctuation feedback. According to the modulation link, submodule voltage of each bridge arm is firstly estimated, and then the number of submodules expected to be invested for each bridge arm is obtained by the aid of a certain modulation technology. According to the method, MMC harmonic circulating current can be effectively restrained, the number of the submodules expected to be invested for each bridge arm is modified in the proportional control link, circulating current fluctuation caused by estimation errors can be further eliminated, the internal circulating current of an MMC can be restrained, the internal equivalent damping of the MMC can be effectively increased, and the dynamic response characteristic of direct-current is improved. The method is used for restraining the MMC harmonic circulating current and direct-current power fluctuation, and an alternating-current system can reliably work and is fine in robustness when being normal or faulted. Besides, the method does not need to sample current of each bridge arm.

The invention discloses a control method based on a dual-vector resonance adjusting double-fed asynchronous wind driven generator. The control method utilizes dual-vector resonance adjusting technology. Vector resonance adjusting with angular frequency being double base frequency can restrain adverse influence caused by negative sequence components in power grid voltage. Vector resonance adjusting with angular frequency being six-fold base frequency can adverse influences caused by five-time harmonic wave components and seven-time harmonic wave components in power grid voltage. No negative sequence and harmonic component extraction of power grid voltage, stator current or rotor current during all closed-loop adjusting is needed. By the method, no complex positive negative sequence and harmonic component extraction is needed, no complex rotor current reference calculation is needed, control delay is reduced greatly, and quickness and stability of a system is improved.

The invention discloses a charging and discharging control system and a charging and discharging control method of a flywheel battery. The system comprises a three-phase uncontrollable rectifying circuit, an energy storage filter capacitor, an insulated gate bipolar translator (IGBT) power conversion circuit, a zero passage detection circuit, a voltage detection circuit, a current detection circuit, a direct current voltage detection and overvoltage protection circuit, a sampling and filtering overcurrent protection circuit, a displacement sampling circuit, a temperature sampling circuit, a digital signal processor controller, an energy storage inductor, a three-phase linked switch and a rotary transformer signal processing circuit, wherein the energy storage inductor is connected between the output end of each phase on the alternating current side of the IGBT power conversion circuit and the input end of a flywheel motor; the three-phase linked switch is connected in parallel with the energy storage inductor respectively; and the rotary transformer signal processing circuit is connected between the signal output end of a rotary transformer of the flywheel motor and the quadrature encoder pulse (QEP) port of the DSP controller. In the method, charging and discharging control of a flywheel battery is realized based on the system. The system has stable output direct current voltage, small high-frequency ripple, quick dynamic response, and is particularly suitable for quick charging and quick discharging working conditions; and the power factor and efficiency of the system are improved greatly.