56 results about "Synchronous generator excitation" patented technology

The present invention provides a virtual synchronous generator controller without using current feedback. The virtual synchronous generator controller comprises the following parts of: 1) a rotor motion equation: a virtual rotor angular frequency and phase are obtained through calculation, and the virtual rotor angular frequency is adopted as the angular frequency of an inverter; 2) voltage control: synchronous generator excitation control and reactive voltage drop characteristics are simulated to control the output voltage amplitude of the inverter; 3) an inverter output power calculation equation: a power transmission line transmission power calculation method is adopted to calculate the reactive power and virtual electromagnetic torque of the inverter, wherein the inverter output power calculation equation is characterized in that calculation can be performed with no current quantity required; and 4) a dq transformation unit and a dq inverse transformation unit: and the angular frequency and phase of the rotor motion equation are adopted as a reference phase angle. The above parts are integrated so as to form the virtual synchronous generator controller without using current feedback. Compared with existing methods, the virtual synchronous generator controller without using current feedback of the present invention does not need current feedback, so that a control algorithm can be simplified; and a current sensor is omitted, and the construction cost of the inverter can be reduced.

The invention discloses a PSS (Power System Stabilizer) switching based synchronous generator excitation control method. A synchronous generator comprises a prime motor, a generator and an excitation regulator, wherein the excitation regulator is provided with a power system stabilizer; the control method comprises the steps of: step 1, setting a soft switch module in a PSS model of the power system stabilizer to enable the power system stabilizer to be switched between a PSS1A model and a PSS2A/PSS2B model; step 2, detecting an on/off state of a power adjusting joint of the prime motor in real time; step 3, controlling the soft switch module based on the on/off state to enable the soft switch module to be switched off and enable the power system stabilizer to run according to the PSS1A model when the power adjusting joint is in an off state, and enable the soft switch module to be switched on and enable the power system stabilizer to run according to the PSS2A/PSS2B model when the power adjusting joint is in the on state. The PSS switching based synchronous generator excitation control method has the advantages of PSS1A and PSS2A/PSS2B.

The invention discloses a synchronous generator parameter identification and control method based on a WAMS. An improved saturated cutset algorithm is adopted in a communication network framework of the WAMS, a method based on time domain transformation is adopted in parameter identification of a synchronous generator, and excitation backstepping control based on a neural network is adopted in control over the synchronous generator. The improved saturated cutset algorithm of the communication network framework of the WAMS, synchronous generator parameter identification of the method based on time domain transformation and the synchronous generator excitation backstepping control method based on the neural network are combined together, and therefore the system has euryzonal performance, intellectuality and reliability.

The invention discloses a closed-loop testing system and a closed-loop testing method for an excitation and packet switching system (PSS) control device of a synchronous generator. The closed-loop testing system comprises a real-time simulation work station, a real time digital system (RTDS), an analog output board card, a power amplifier, an excitation and PSS control device and a digital output board card, wherein the real-time simulation work station is connected with the RTDS; the RTDS transmits current and voltage signals to the excitation and PSS control device through the analog output board card and the power amplifier; the RTDS transmits a grid-connected circuit breaker switching signal of the synchronous generator to the excitation and PSS control device through the digital output board card; and the excitation and PSS control device transmits a pulse trigger signal of a six-pulse rectifier bridge to the RTDS through the digital output board card. The self-parallel excitation closed-loop testing system for the excitation and PSS control device of the synchronous generator is flexible in testing and can perform multiple types of tests.

The invention discloses a synchronous generator excitation system based on fuzzy PID control and a voltage regulation method. The method comprises the following steps: calculating the total generator-end voltage of a synchronous generator according to a sampled generator-end voltage; calculating a voltage deviation and a voltage deviation differential according to a reference voltage and the totalgenerator-end voltage, determining fuzzy control parameters according to the voltage deviation and the voltage deviation differential, and carrying out PID regulation of a voltage loop on a regulating point according to the fuzzy control parameters and the reference voltage, and obtaining a reference value of the excitation voltage, wherein the fuzzy control parameters comprise a proportional parameter P, an integral parameter I and a differential parameter D; regulating a current loop according to the detected excitation voltage of the generator and the given reference value of the excitation voltage, and outputting an adjusted excitation voltage; carrying out PWM waveform modulation on the adjusted excitation voltage to obtain a PWM wave signal; and outputting the PWM wave signal to a driving circuit to drive an IGBT to be switched on. The technical problem of generator excitation current/voltage overshoot due to the adoption of traditional PID regulation control in an existing synchronous generator excitation system is solved.

The invention relates to a double permanent magnet power-frequency brushless synchronous generator. A composite stator, a permanent magnet rotor and a compensating rotor are arranged inside a power generator body, wherein the permanent magnet rotor and the compensating rotor are arranged at the lower end of the composite stator, the rear ends of the composite stator and the compensating rotor are provided with a permanent magnet exciter assembly and a signal sensor assembly, the lower ends of the permanent magnet exciter assembly and the signal sensor assembly are also respectively provided with a rotary AVR (Automatic Voltage Regulator), the permanent magnet exciter assembly comprises a permanent magnet exciter stator and a permanent magnet exciter rotor, and the signal sensor assembly comprises a signal sensor stator and a signal sensor rotor. According to the invention, by adopting a forward/reverse series compensation technology, the adaptability of power factor of the generator is improved; the defects of uncontrollable excitation and nonadjustable voltage of the traditional permanent magnet power-frequency brushless synchronous generator can be overcome by using the rotary AVRs, and the voltage adjusting level is improved; by adopting a permanent magnet excitation technology, compared with the electric excitation power-frequency brushless synchronous generator, the double permanent magnet power-frequency brushless synchronous generator has the advantages that the efficiency of the double permanent magnet power-frequency brushless synchronous generator can be improved by 4-8 percent, the size and the weight can be reduced by 30-40 percent, and the copper and iron consumables can be saved by about 20-30 percent.

The invention provides a tuning method for a difference coefficient of a synchronous generator excitation system. The method comprises the following steps: firstly, clearly distinguishing the number of regional central points, an operating voltage of each central point in each period, the number of generator nodes, active output power of each generator, and a load value of power supply by each generator; then, calculating a standard deviation index of a central point voltage, measuring voltage fluctuation, calculating an average active power grid loss rate index, and considering the operationeconomy of the system; and finally, establishing a multi-objective optimization model of the difference coefficient of the synchronous generator excitation system, taking the minimum of the standard deviation of the central point voltage and the average active power grid loss rate as an objective, and calculating an optimal difference coefficient by considering constraint conditions such as powerflow constraint, control variable constraint and safety constraint. According to the tuning method for the difference coefficient of the synchronous generator excitation system, grid voltage can be effectively improved and power grid loss can be effectively reduced.

The invention discloses an offline temperature characteristic detection method for a SiC (Silicon Carbide) deexcitation resistor, belonging to the detection technology of SiC deexcitation resistors of synchronous generator excitation systems. The offline detection method is characterized by comprising the following steps of: connecting the SiC deexcitation resistor and a testing power supply according to a predetermined time length T; and meanwhile, monitoring the current, the voltage and the surface temperature value of the SiC deexcitation resistor by using an ammeter, a voltmeter and a thermodetector to obtain the temperature characteristic of the SiC deexcitation resistor, wherein the predetermined time length T for switching on the power supply is determined according to 20-50 percent of rated energy of the SiC deexcitation resistor. Aiming at the present circumstance that the complex online deexcitation testing detection method for the generator is adopted for the temperature characteristic of the SiC deexcitation resistor in China, the invention provides a new detection method which is economical and practical as well as safe and simple. Therefore, the SiC deexcitation resistor with defects can be found, the running deexcitation resistor is ensured in the sound condition, and the safety and the reliability of an excitation device and the generator are improved.

The invention discloses a secondary development method of a synchronous generator excitation regulator control program integrated embedded language, comprising the steps as follows: (1) compiling an embedded script program using lua scripting language; (2) modifying the running environment program of the script program according to an operating system and a compiler used so as to link the running environment of the script program to a host program in the form of program library, wherein the host program is an excitation regulator C language control program; (3) writing an interface function for calling the script program from the host program and an interface function for accessing the host program from the script program; and (4) initializing the running environment and the running state of the script program, and completing registration of the interface function for calling the script program from the host program in the host program so as to enable the host program to read, compile and execute the script program by calling the interface function of the script program.

The invention relates to a method of acquiring basic evaluation data of synchronous generator excitation system performance. The method of acquiring basic evaluation data of synchronous generator excitation system performance includes the steps: determining the basic evaluation factors of synchronous generator excitation system performance; determining the acquisition channel of the basic evaluation data corresponding to the basic evaluation factors; and finally acquiring the basic evaluation data through the acquisition channel. The determined basic evaluation factors not only include a sensitive basic evaluation factor, but also include an insensitive basic evaluation factor, so that the comprehensiveness of the evaluation data is improved; and the determined acquisition channel includes field tests, simulation calculating of excitation system, nameplate technology parameter data and power grid operation record data, and performs adaptive selection for different basic evaluation factors, so that accuracy of the evaluation data is improved. The method of acquiring basic evaluation data of synchronous generator excitation system performance can acquire comprehensive and accurate evaluation data so as to provide basis for graded evaluation of excitation system performance.

The present invention discloses a synchronous generator excitation control method based on a fuzzy sliding mode. The method comprises: the step 1, establishing each unit simplification model and a fuzzy sliding mode controller model of a synchronous generator excitation system; the step 2: taking the error e1 of the feedback voltage U and the given voltage U0 at the end of a synchronous generator as the input of a sliding mode variable structure control portion, and taking the e1 and the (img file='DDA0001336670490000011. TIF' wi='36' he='63'/) as the input of a fuzzy control portion; the step 3: obtaining an excitation voltage Uf after overlapping of the fuzzy control output us and a sliding mode variable structure; the step 4: obtaining the excitation voltage UF of the synchronous generator through processing the feedback voltage U by employing a power amplification unit; and the step 5, taking the UF as the input of the synchronous generator unit, and obtaining the actual output voltage UG of the synchronous generator, wherein the actual output voltage UG of the synchronous generator is taken as the input of the voltage measurement unit to obtain the feedback voltage U at the end of the synchronous generator. The synchronous generator excitation control method based on the fuzzy sliding mode ensures the excellent static and dynamic response capability of the generator system.

The invention discloses a dynamic simulation test device and test method for a static variable-frequency starting system of a gas turbine generator. The device comprises a synchronous motor-generatorset, a static variable-frequency starting system, a voltage source type frequency converter system, a synchronous generator excitation system, an automatic quasi-synchronization device and a load resistance box; the input end of the synchronous motor-generator set is connected with the output end of the voltage source type frequency converter system; the output ends of the synchronous motor-generator set, the static variable-frequency starting system, the synchronous generator excitation system and the automatic quasi-synchronization device are connected with the load resistance box; the inputends of the static variable-frequency starting system, the voltage source type frequency converter system, the synchronous generator excitation system and the automatic quasi-synchronization device are connected with an alternating current power supply. The test device and method have the advantages that the problem that a gas turbine generator static variable-frequency starting dynamic simulation test device and method are lacked in the prior art is solved, and testing and simulation are conducted through the dynamic simulation test device.

The invention provides a thermal power plant SG excitation system optimal parameter setting method based on an ACS algorithm. The method comprises the following specific implementation steps: firstly,building an SG optimization model; secondly, inputting a frequency deviation caused by a power grid fault into an excitation system configured with a PSS, and outputting an excitation voltage ufd after adjustment; and finally, feeding the ufd back to the SG, and carrying out next iteration, wherein a PSS parameter and an excitation gain parameter are set by adopting the ACS algorithm. And the above process is continuously circulated till that the algorithm converges to obtain the optimal setting parameter. The ACS algorithm effectively solves a problem that the PSS parameter and the excitation gain parameter of the thermal power plant SG are difficult to set optimally in a practical application. The method has the following two advantages that firstly, a self-adaptive sequence based on anexploration direction is introduced into the algorithmso that a global search capability is remarkably improved, and the PSS parameter and the excitation gain parameter are prevented from falling into local optimum; and secondly, the ACS algorithm adopts a single-agent search mechanismso that the algorithm can approach the optimal PSS parameter and the excitation gain parameter at a higher speedand higher convergence stability;

The invention discloses a generating device of synchronous generator exciting system identification signals which comprises a power unit (7), a signal generating unit (8) and a control unit (9); the power unit provides the needed working power for the other two units; the signal generating unit is connected with the generator terminal three-phase voltage and a neutral point respectively, and stacks the identification signal needed by an exciting system mould identification test to the voltage signal on the end of the generator according to the control signal provided by the control unit, the exciting system connected with four integrated signals which are respectively overlapped with the identification signal is connected into an input port; the control unit is used for generating a pseudo-random or a step signal which is provided to the signal production unit, or outputs directly from an output signal port. The invention provides a new test device for the power system which not only solves the difficulty in doing the exciting system mould identification test for the generator without an extra-added signal input port, but also simplifies the test equipment, and improves the test efficiency.

The present invention relates to a unit comprising a plurality of varistors, specifically for the purposes of overvoltage protection in synchronous generator exciter discharge systems. Compared with existing varistor units, the unit of the invention is able to be transported more efficiently, is more compact, and requires fewer individual varistor units to be placed in a synchronous generator exciter discharge system while still achieving the required thermal and electrical ratings to perform to the desired requirements.