170 results about "Decoupling controller" patented technology

A power system controller using a 2×2 decoupling controller, a model reference, and feedback with delay. Embodiments provide control of microgrid frequency F and voltage V. In addition, this technique can also be used to control the real and reactive power delivered from the microgrid to the connected macrogrid. The control engineering approach is the same in both cases, but the roles of the four variables involved are reversed.

The control method for a NN reverse decoupling controller of bearingless ac asynchronous motor comprises: composing the controlled target with two Clark inverse transforms, two current track inverters, the said motor and its load; according to corresponding inverse system, making up the NN inverse by a static NN and an integrator with learning algorithm to series connect between composite targets and form the pseudolinear system; designing linear close-loop controller as the method on linear system; finally, connecting the controller and NN inverse to form the objective controller with former transforms and inverters. This invention has well control performance.

The invention discloses a current internal-model decoupling controller of an open-winding permanent-magnet synchronous motor. A common three-phase permanent-magnet synchronous motor stator winding is subjected to circuit opening, so that six end leads are led out and respectively correspondingly connected with a first inverter and a second inverter; only one direct-current power supply supplies power for the current internal-model decoupling controller of an open-winding permanent-magnet synchronous motor, so that after a, b and c-phase sampling currents ia, ib and ic of a motor stator winding pass through the current internal-model decoupling controller, a d-axis modulation voltage u*d and a q-axis modulation voltage u*q are obtained, and then the motor is controlled by using a voltage space vector pulse-width modulation strategy. The open-winding permanent-magnet synchronous motor enables the harmonic content of an output voltage to be reduced under a lower switching frequency, and under the condition that the space is small and the battery capacity is limited and under the limitation of the voltage/current capacity of a power switch device, the total power and loading capacity of a system can be enhanced. On the basis of keeping the structure advantages of the novel motor, the influence on the system caused by mismatch errors arising from system parameters is reduced, the robustness of the system is improved, and the controller is easy to adjust.

The invention relates to a virtual impedance based DC-side fault current suppression method of a modular multilevel converter (MMC), belonging to the technical field of power transmission. A DC-side fault of the MMC can cause overcurrent of a switching device; and based on a traditional control strategy, a virtual impedance parallel circuit in a primary system is mapped to a controller by a feedback function, DC bus impedance is equivalently risen, thus, instantaneous rising speed of a fault current when a fault occurs in a DC side of the MMC is effectively prevented without increasing the fault current rising speed of other types of faults. In the core scheme, firstly, the DC bus voltage and current of a MMC system and the active power of a PCC point of an AC side are measured in real time; secondly, if the virtual impedance circuit is connected in series to a DC bus, the DC voltage deviation and the active power deviation are calculated when the DC current passes through the virtual circuit; and finally, the associated deviation correction quantity is additionally added to a measurement value of an active power type control quantity of a DQ decoupling controller for correction.

By adopting the method of combining mechanism analysis with experimental analysis, the invention establishes a mathematical model of a constant temperature and humidity air-conditioning system, deduces a four-output and four-input transfer function matrix, and designs a decoupling compensator by adopting the feedforward compensation method so that the transfer function matrix of the constant temperature and humidity air-conditioning system can be converted into a diagonal matrix, thereby getting rid of the coupling among control loops and carrying out verification through emulation. Results indicate that the application effect of the decoupling controller in the constant temperature and humidity air-conditioning system is better, and the quality and the performance of the system are improved and increased.

This invention relates to a simultaneous control applied in magnetic suspension switch magnetic resistance motor, which comprises the following steps: adopting extensive flow control inverter, wherein the controlled magnetic suspension switch magnetism motor forms compound controlled subject; forming neural net athwart by static neural net and integral device through formula study; connecting neutral net with the compound controlled subject then compounding into two radius direction position sub system to forming anti-linear system; making the linear loop controller to the false linear system according to the linear system design; finally connecting the neural net with the linear loop controller and with the flow controlled inverter to form neural net decoupling controller.

The invention discloses a direct power control method for inhibiting voltage fluctuation of a DC-side bus of a photovoltaic grid-connected inverter, and belongs to the technical field of converter control. The method comprises the steps of establishing a photovoltaic power generation system, determining instantaneous active components v<alpha> and i<alpha> and instantaneous reactive components v<beta> and i<beta> of a power grid, realizing the maximum power point tracking of a photovoltaic array by adopting a fixed-step perturbation and observation method, determining the disturbance power Pswith a short wavy line thereon by a disturbance observer through a correction link; respectively taking output signals [nu]<^>P and [nu]<^>Q of two PI controllers as the input of a feedforward decoupling controller to construct a feedforward decoupling model, obtaining voltage control signals e<alpha> and e<beta> by combining the output uP and uQ of the feedforward decoupling system based on voltage v<alpha> and v<beta> of the power grid, and carrying out [alpha][beta]/abc conversion on the voltage control signals e<alpha> and e<beta> to obtain an SPWM control signal e<a, b, c> of the inverter. According to the invention, the feedforward disturbance is introduced into the voltage outer loop, and the zero steady-state error tracking of the DC bus voltage can be ensured by adopting a simpleproportional controller; it does not need to obtain phase information of the power grid voltage and does not need to perform synchronous rotation coordinate transformation, so that the stability problem caused by the use of a phase-looked loop (PLL) is avoided.

The invention discloses a rail train crash test system. Each power carriage of a test train is provided with a rail wheel drive device and a rubber wheel drive device which can be mutually switched. A test track is provided with functional areas including a speed detection area and a decoupling area. The rail train crash test system further comprises a crash controller including a position confirmer for confirming the position of the test train on the test track and a determiner for determining whether or not the current speed of the test train satisfies a preset condition. The trial train is provided with a central controller in communication connection with the crash controller, the central controller including a train speed acquisition device for transmitting the speed of the test train to the crash controller in real time, a decoupling controller for controlling the decoupling operation between the power carriages of the test train, and a drive wheel switch for controlling the switching operation of the power carriages. The rail train crash test system solves technical problems in the prior art of low success rate of the crash test of the rail train, proneness to a waste of cost and the like.

The invention provides a design method for resolving a modal space controller of a hydraulic drive six-degree-of-freedom parallel mechanism. A modal matrix is directly calculated according to system structure parameters; a six-degree-of-freedom strong coupling multi-input multi-output system is converted into a six-decoupling single-input single-output system in a modal space by conversion of the modal matrix; and parameters of a dynamic pressure feedback controller in the modal space are designed according to a hydraulic dynamic pressure feedback technology. The problem about coupling of a system is solved, and each decoupled modal space channel has the optimal control performance. The design method is only related to the system structure parameters, so that the application range of a modal decoupling controller is greatly expanded.

It is a sort of decoupling control system of chemical multivariable procedure, it makes up of nXn dimensional decoupling controller matrix and multiple signal mixers, of which, n is output dimension of multivariable controlled process. It makes use of deviation signal as feedback regulated information of system output response, the deviation signal is from input signal of n dimensional given value of system default point and n dimensional output measuring signal of actual controlled process, after it is operated by decoupling controller matrix, the n dimensional control output signal is sent to n dimensional input adjusting device of controlled process, thereby achieve the objective of asymptotical tracking system's set point inputs signal and restrains load interference signal. This control system enable to maintain stability of robust, and fit in with the modeling error of actual controlled process and perturbations of procedural parameter in greater extensiveness.

The invention discloses a suspension force feedforward compensation decoupling method and a control device of a bearingless permanent magnet synchronous motor. During control, it includes an expanded current hysteresis PWM inverter configured to supply power to the torque winding of the motor; the structure is expanded The coupled levitation force model; construct an extended feedforward compensation decoupling controller; the extended feedforward compensation decoupling controller takes two levitation force components, torque current components, permanent magnet equivalent excitation current and rotational speed as its input , the reference value of the three-phase current of the suspension winding is output, and the actual three-phase current is output after the first current hysteresis PWM inverter, which is used as the input of the extended coupling suspension force model, and the extended coupling suspension force model outputs the rotor displacement; finally, the two A decoupled suspension force subsystem and speed subsystem design a closed-loop regulator. By using the invention to control the bearingless permanent magnet synchronous motor, the stable suspension of the controlled motor can be realized, and the system has fast response, simple algorithm and excellent performance.

The invention discloses a decoupling control method of a single leg joint of a hydraulic four-leg robot. The method comprises proportion integration differentiation (PID) neural network decoupling control, neural network model reference decoupling control and prediction control. The method comprises the following steps that a reference model under the condition that a system is free of coupling is set, and then a neural network controller is trained so that the output of the system can keep up with the output of the reference model; meanwhile, a neural network model is used for prediction, and the next step of output of the system is predicted according to current and previous input and output data of a controlled object; and finally, the weight of the neural network is rectified in an online mode according to the predicted output and the given reference output so that optimizing indexes of the decoupling controller of the neural network can reach the smallest value, and the purpose of decoupling control is achieved. By the adoption of the decoupling control method, the coupling influences among all the joints of the robot can be effectively reduced, and decoupling control over all the joints of the robot is achieved.

A micro-grid control system has a first 2×2 decoupled controller that controls voltage and voltage angle by adjusting real and reactive power using real time feedback, and a second 2×2 decoupled controller that controls real and reactive power by adjusting voltage and voltage angle using real time feedback. The first 2×2 decoupled controller and second 2×2 decoupled controller together form a hierarchical microgrid control system, where the second 2×2 decoupled controller is a supervisory controller of the first 2×2 decoupled controller. The micro-grid control system may also include a third 2×2 decoupled controller that supervises the second 2×2 controller.

The invention discloses a control method of SVG dynamic reactive power compensation and harmonic management based on PI feedforward decoupling. The method comprises a step of inputting a difference value between DC side reference voltage and capacitor voltage to a DC side PI controller, a step of sampling three-phase load current through a current transformer, carrying out adc/dq conversion on signals and sending the signals to a low-pass filter LPF, adjusting dq axis components outputted by the LPF to be reference command current of a PI feedforward decoupling controller, comparing the reference command current and grid current under a dq coordinate system, and sending an error signal to the PI feedforward decoupling controller, a step of carrying out dq/abc conversion on an output signalof the PI feedforward decoupling controller, inputting the signal into an SVPWM driving module to generate a switching signal to control a three-phase full-bridge inverter, and allowing the three-phase full-bridge inverter to generate a compensation signals to realize the dynamic reactive compensation and harmonic management. According to the control method, a complex controller is not needed, aharmonic compensation effect can be achieved by using the PI controller, the control method is simple and easy to implement, and the compensation effect is better than that of a conventional control method.

The invention relates to an enthalpy difference temperature and humidity decoupling control method based on adaptive fuzzy PID decoupling control. The method comprises the following steps: (1) determining a model of a temperature and humidity coupling object in an enthalpy difference lab system, and using an identification model parameter; (2) performing enthalpy difference lab temperature and humidity decoupling design; (3) designing an adaptive fuzzy PID controller; and (4) designing an enthalpy difference lab temperature and humidity decoupling controller. The method can realize the complete decoupling of the temperature and humidity of the enthalpy difference lab, and further proves the simple practicability of the feedforward compensation algorithm, can shorten the adjustment time ofthe system, meets the requirements of national standards, and improves the working efficiency of the enthalpy difference lab. The method can improve the stability of the system and reduce the steady-state errors, so that the average variation range of the dry bulb temperature is less than or equal to +/-0.3 DEG C, and the average variation range of the wet bulb temperature is less than or equal to+/-0.2 DEG C. The temperature and humidity adjustment accuracy of the enthalpy difference lab can be improved.

An industrial process control technology field two-input-output system's decoupling control method, it lets the reverse decoupling structure's decoupling machine and the controller into one decoupling control machine, and it forms the unit feedback control structure. By adding the compensation item, it can eliminate decoupling controller machine's unstable factors. It designs the decoupling controller machine's sub-controller base on the inner module theory, then the final decoupling control machine is almost the easy implement PID/PI controller. When has the actual operating control, the first is deduce the controller parameter's lowest borders which can meet the LuBang stability condition. Then on the base of this border minimum, separately enlarge every loop's control parameter monotonously until gain the system mark capability which complies with the project's requirements. The control method structure of this invention is simple and easy to achieve, and has wide applicability and is easy to operate, it can quickly accurate tuning control parameters and makes the closed loop control system meet the LuBang stability requirement.

The invention discloses a construction method for a neural network generalized inverse decoupling controller of a bearing-free synchronous reluctance motor, which comprises the steps: taking two Park inverse converting type inverters, two Clark inverse converting type inverters and two direct current tracking type inverters as a wholly-formed composite controlled object after the two Park inverse converting type inverters, the two Clark inverse converting type inverters and the two direct current tracking type inverters are respectively and sequentially connected with one another in series and before the two Park inverse converting type inverters, the two Clark inverse converting type inverters and the two direct current tracking type inverters are connected with the bearing-free synchronous reluctance motor; forming a generalized imitative linear system before a constructed neural network generalized inverse is connected with the composite controlled object in series, and forming a linear closed loop controller by two position controllers and a speed controller; and jointly forming the neural network generalized inverse decoupling controller by the means that the linear closed loop controller, the neural network generalized inverse, the two Park inverse converting type inverters, the two Clark inverse converting type inverters and the two direct current tracking type inverters are respectively and sequentially connected with one another in series. The independent decoupling control between the electromagnetic torque and the radial levitation force and the independent decoupling control of the radial levitation force between two components on the vertical direction are realized according to the closed ring control and the PID (proportion integration differentiation) parameter adjustment, and the control performance of the bearing-free synchronous reluctance motor is obviously improved.

The invention discloses a maximum power tracking control method of a variable speed and variable pitch wind generating set based on feedforward decoupling control. According to the method, by estimating an aerodynamic moment of a wind wheel, an aerodynamic moment feedforward decoupling controller is designed based on an electromagnetic moment response model and a driving system model of the wind generating set according to an estimated aerodynamic moment result, so that a dynamic tracking influence on an optimal resistance moment due to the randomness and the uncertainty of an external aerodynamic moment is eliminated effectively; a resistance moment at a connecting part between a wheel hub and a low speed shaft of a spindle can be completely subjected to closed-loop control of an electromagnetic moment; accurate dynamic tracking of the optimal resistance moment is achieved efficiently; and the maximum power trackability of the wind wheel is improved effectively.

The invention discloses a method of controlling pressure intelligent decoupling for a gas collecting pip of a coke oven. The invention comprises the following steps: the pressure of the gas collecting pipe of each coke oven is inspected; the deviation and deviation variance ratio of the inspected value and the pressure given value are calculated; each single pipe fuzzy controller is able to obtain each single output control increment according to the calculation of the deviation and the deviation variance ratio; an intragroup decoupling controller is applied to decouple the control increment inside the group to obtain the correction quantity of the control increment; an intergroup intelligent decoupling controller compensates the correction quantity calculated by the intragroup decoupling controller and then converses into a control output of opening increment of each branch pipe butterfly valve; a butterfly valve expert controller turns the butterfly valve opening increment into the actual opening output of the butterfly valve and then is assigned and corrected on the butterfly valve of each branch pipe. By utilizing the technology of combining the fuzzy control and the expert control, the invention designs the decoupling algorithm, eliminates the coupling effect on the pressure of the gas collecting pipe of the coke oven and realizes the automatic control of the pressure of the single-seat gas collecting pipe of the coke oven.

The invention discloses a five-DOF (freedom of degree) bearingless synchronous reluctance motor decoupling controller and a construction method thereof. Three expanded current hysteresis loop PWM (pulse width modulation) inverters, a switch power amplifier and a five-DOF bearingless synchronous reluctance motor form a compound controlled object; five support vector machine second-order systems, one support vector machine first-order system and eleven integrators are utilized to construct a support vector machine alpha-order inverse system and offline training is carried out, the support vector machine alpha-order inverse system is placed in front of the compound controlled object to form a pseudo linear system, and the pseudo linear system is equivalent to five position second-order integration subsystems and one position first-order integration subsystem; and five position controllers and one rotating speed controller are respectively designed for the six integration subsystems, thus a linear closed-loop controller is formed. In the invention, a least square support vector machine is adopted to approach an alpha-order inverse model of a nonlinear system, the dynamic decoupling control among all the controlled variables is realized, and the control performance of the overall system is effectively improved.

The invention discloses a permanent magnet synchronous motor (PMSM) vector decoupling controller for an electromobile based on a DSP (Digital Signal Processor). The controller is based on a DSP chip and comprises a DSP power supply, a serial port communication circuit, a power main circuit, a signal detection circuit, a protection circuit and a CAN (Controller Area Network) communication interface circuit; the controller receives a motor control mode and a torque parameter from a VCU (Vector Control Unit) on a bus; the DSP chip accomplishes corresponding vector control, current speed ring control and an SVPWM (Space Vector Pulse Width Modulation) algorithm; an output PWM signal controls on-off of a power electronic device in an inverter circuit, thereby controlling a PMSM; a current and voltage detection circuit realizes self-protection and fault diagnosis by the protection circuit by acquiring real-time voltage and current parameters of the PMSM; a photoelectric encoder obtains an electrical angle and a rotating speed feedback value by acquiring position and rotating speed parameters of the PMSM; and finally the real-time status of motor control is fed back to the VCU by the CAN communication interface circuit. With the adoption of the controller, a PMSM control system for the electromobile has the advantages of high performance, high reliability, convenience in maintenance and full digitalization.

The invention discloses an inverse system decoupling controller of a five-degree-of-freedom bearingless synchronous reluctance motor. In the inverse system decoupling controller, a linear closed-loop controller, an alpha-th-order inverse system and a composite controlled object are connected in series successively; the composite controlled object consists of three extended hysteresis current controlled PWM inverters, a switching power amplifier and the five-degree-of-freedom bearingless synchronous reluctance motor; the alpha-th-order inverse system and the composite controlled object constitute a pseudo linear system; the five-degree-of-freedom bearingless synchronous reluctance motor consists of a three-degree-of-freedom active magnetic bearing and a two-degree-of-freedom bearingless synchronous reluctance motor which share one rotor; the rotor is provided with a plurality of eddy-current sensors; and the linear closed-loop controller consists of a rotary speed controller, four radial position controllers and an axial position controller. The controller disclosed by the invention has compact structure; and by adopting the invention, the radial suspension force, axial suspension force, motor radial suspension force and electromagnetic torque of the magnetic bearing can be controlled independently and the control performance of the entire system can be effectively increased.