127 results about "Real Time Digital Simulator" patented technology

The invention discloses a method and a device for dynamically testing a synchronized phasor measurement unit (PMU) in a power system. The method comprises the following steps: setting up a simulation model comprising a generator unit, a transformer, circuits, a load and an equivalent power grid on an RTDS (Real-Time Digital Simulator) platform; utilizing the simulation module to simulate the dynamic characteristics of the power system and detecting the PMU of the synchronized phasor measurement unit through real-time simulation tests. The method and the device are convenient to realize, the performance of the PMU can be correctly and reasonably detected and evaluated, and the further development of a PMU technology is better promoted. The test requirements of laboratories on the dynamic performance of the PMU are met, an effective means is provided for network access detection, the work requirements of manufacturers on product development, delivery inspection and the like are met, and the quality of the synchronized phasor measurement unit in the power system is specified and ensured. The method and the device have great meaning in improving the running reliability of the power grid.

The invention relates to an electromagnetic transient and electromechanical transient hybrid simulation method based on a real time digital simulator (RTDS), belonging to the technical field of power system transient simulation. The method comprises the following steps: an electromechanical transient simulation system carries out electromechanical transient real-time simulation computation on a first power system; the RTDS carries out electromagnetic transient real-time simulation computation on a second power system; the electromechanical transient simulation system transfers the voltage and amperage of the first power system to the RTDS via an interface process control system and the RTDS carries out electromagnetic transient computation on the second power system by utilizing the voltage and amperage; and the RTDS transfers the voltage and electric power, which are obtained through simulation computation, of the second power system to the electromechanical transient simulation system via the interface process control system and the electromechanical transient simulation system carries out electromechanical transient computation on the first power system by utilizing the voltage and electric power. The method is conductive to understanding the dynamic characteristics of the electromechanical transient process of large-scale power systems and the electromagnetic transient process of a certain specific part and can coordinate the scale, precision and velocity of simulation.

The fault ride-through and power smoothing system includes a buck converter for Maximum Power Point Tracking (MPPT) of a PV array power system, a buck-boost converter to connect a supercapacitor energy storage system (SCESS) to the DC link, and a voltage source converter (VSC) to transfer the DC link power to the grid. Three independent controllers are implemented, one for each power electronics block. The effectiveness of the controllers is examined on Real Time Digital Simulator (RTDS).

The invention discloses a closed-loop test system of a flexible direct current transmission system control and protection system. The closed-loop test system includes a real-time digital simulator, interface hardware equipment and control protection equipment of a modularized multi-electric level-based flexible direct current transmission device; the interface hardware equipment includes a power amplifier, a terminal type relay and a converter valve internal analog quantity and pulse expansion plate; the real-time digital simulator is connected with the control protection equipment of the modularized multi-electric level-based flexible direct current transmission device through the interface hardware equipment; and as a result, the closed-loop test system can be formed. The closed-loop test system is simple and flexible. With the closed-loop test system adopted, an entire modularized multi-electric level-based flexible direct current transmission actual control protection system can be tested conveniently and quickly.

The invention discloses an operation method for safely applying a line protection device to a wind power station, which relates to the relay protection of a power plant and is provided aiming at solving the problem that the line protection device in the current system cannot meet the protective requirements of the wind power station very well. The operation method comprises the following steps of: firstly, establishing a real-time simulation model which is a virtual power grid environment, including fault points in a wind power station, a bus and transmission lines, a main transformer unit of a power generator, a current and voltage mutual inductor, an equivalent system and a simulation system; secondly; establishing an experimental detection platform including a real-time digital simulation work station, an RTDS (Real Time Digital System) real-time digital simulator, an analogue quantity output board card, a power amplifier, a line protection device, an analogue circuit breaker, a switch conversion device and a digital quantity input board card; and thirdly, accessing the line protection device to be detected to the power amplifier of the detection system, then connecting the line protection device with the analogue circuit breaker and carrying out various kinds of experiments. The experiment implemented by using the wind power station model and an onsite oscillograph of the wind power station can provide a real and accurate simulation environment so that validation possibility is improved, and therefore the line protection device to be detected can be safely used for the wind power station after detected.

The invention relates to a simulated direct-current power transmission control protection system. The system comprises a direct-current control protection simulation basic functional module, configuration software NewLinkC, a direct-current control protection simulation program module, a direct-current control protection simulation module and a system element simulation module of a real-time digital simulator (RTDS), wherein the direct-current control protection simulation program module generates a direct-current control protection simulation program by performing function configuration on each element of the direct-current control protection simulation basic functional module on the configuration software NewLinkC; the direct-current control protection simulation program module is defined per se and encapsulated to form the direct-current control protection simulation module by self-defined element programming and encapsulation technology of the RTDS; and the direct-current control protection simulation module is interconnected with the system element simulation module of the RTDS to form an RTDS-based closed-loop AC/DC simulation system. The system realizes one-to-one device-level simulation, has the advantages of strong universality and portability, low cost, high flexibility and strong practicability, and is simply connected to an RTDS simulation platform.

The invention relates to a system for carrying out closed loop test by utilizing transmission system converter transformer protector and a method thereof. The system comprises a real-time simulation workstation of a direct current transmission system real-time simulation model, an RTDS real-time digital simulator carrying out real-time calculation on the simulation model, an analog quantity output card, a power amplifier, a converter transformer protector, a digital quantity output card, a digital quantity input card and a direct current transmission control protector; wherein the real-time simulation workstation is connected with the RTDS real-time digital simulator, the RTDS real-time digital simulator transmits current and voltage signals to the converter transformer protector by virtue of the analog quantity output card and the power amplifier, and the RTDS real-time digital simulator transmits a gear signal of the tap of the converter transformer to the converter transformer protector, the converter transformer protector transmits tripping and alarm signals to the RTDS real-time digital simulator by virtue of the digital quantity input card, and the direct current transmission control protector is connected with the RTDS real-time digital simulator. The system test of the invention is flexible, and multiple tests can be carried out. The test method of the invention is simple to operation and is convenient and practical.

The invention discloses a converter transformer protection real-time digital system (RTDS) real-time digital closed loop test system and a method thereof. The test system comprises an RTDS real-time digital simulator and a converter transformer protection device, wherein the RTDS real-time digital simulator outputs a voltage analog signal, a current analog signal and a tap joint gear digital signal in a converter transformer simulation model to the converter transformer protection device; the converter transformer protection device inputs a protection trip digital signal to the RTDS real-time digital simulator; a direct-current power transmission system simulation model, established in the RTDS real-time digital simulator, of the converter transformer is a single-phase model; and an additional inductor Xp is connected between a converter transformer and a converter valve. The test system can provide the primary side head-end three-phase current output and the secondary side head-end three-phase current output, required for a converter transformer protection real-time simulation test, of the converter transformer, and also can provide the primary side tail-end three-phase current output and the secondary side tail-end three-phase current output of the converter transformer, thereby meeting the requirements on a converter transformer protection RTDS test.

The invention discloses a micro-grid analogue simulation system based on a real-time digital simulation platform. The micro-grid analogue simulation system comprises a real-time digital simulator and a micro-grid device. The real-time digital simulator comprises a hardware interface and a software system. The hardware interface comprises an input interface card and an output interface card. A micro-grid system model is set up in the software system and comprises a micro-grid power distribution network model and a distributed type power micro-grid device primary system model. The micro-grid device comprises a micro-grid central control unit, a photovoltaic power generation controller, an energy storage device controller and a protection device controller, wherein the photovoltaic power generation controller, the energy storage device controller and the protection device controller are connected with the micro-grid central control unit respectively. The micro-grid analogue simulation system can simulate the practical running condition of a power grid, the strategy of controlling and protecting the whole micro-grid device can be conveniently and rapidly verified and adjusted, the micro-grid analogue simulation system is economical and practical, and the test result is ensured.

The invention discloses a display system and a display method for operating characteristics for an alternating-current and direct-current power grid based on RTDS (real-time digital system) real-time digital simulation. The display system is equipped with a simulation workbench for establishing an alternating-current and direct-current power grid model, a real-time digital simulator, a protocol conversion card, an interchanger and a power grid characteristic display device; the real-time digital simulator is used for outputting analog amount and digital amount to the power grid characteristic display device through the protocol conversion card and the interchanger; the power grid characteristic display device is used for returning an operation control order to the digital simulator in real time through the interchanger and the protocol conversion card. The display system further comprises a transient data processing unit which is equipped with a transient data extracting unit and a conversion unit; the power grid characteristic display device is equipped with a transient database, a variable database, a searching mapping unit and a replay display device. The display system can be used for realizing visual display of power grid operation characteristics of steady state data, transient data and the like, is reliable in performance, simple and practical.

The invention discloses a flexible simulation test platform for electric power system transformer protection devices. The flexible simulation test platform comprises an RTDS (Real Time Digital Simulator) system and a power amplifier, wherein a transformer protection test system model constructed by the RTDS system comprises a primary system model, a failure setting subsystem model and a breaker control subsystem model; the failure setting subsystem model and the breaker control subsystem model are respectively connected with the primary system model; the failure setting subsystem model is used for providing failure signals; the breaker control subsystem model is used for providing tripping and closing signals; the primary system model is used for outputting electric capacity signals to a transformer protection device to be tested through the power amplifier; and the transformer protection device to be tested is used for feeding protection action signals back to the breaker control subsystem. According to the flexible simulation test platform, a uniform detection platform with favorable adaptability to the transformer protection products of different factories, different types and different principles is constructed; and through the platform, comprehensive and complete detection can be carried out on the transformer protection devices, and the operation of the detection of the transformer protection devices can be simplified and more standardized.

The embodiment of the invention provides a no-load cutting-in modeling and experimental method of a double-fed type wind-driven generator. The modeling method comprises the following concrete steps: firstly, establishing a mathematical model for no-load cutting-in control of the double-fed type wind-driven generator; simulating a small-step cutting-in switch element in the double-fed type wind-driven generator by utilizing a valve switch which is controlled by binary control words in a real-time digital simulator (RTDS) of an electric power system; and realizing the simulation control of the double-fed type wind-driven generator from the no-load state to the cutting-in state by controlling the switching-on and the switching-off of the valve switch. The technical scheme of the invention can be implemented to realize the real-time simulation process of the double-fed type wind-driven generator from the no-load state to the cutting-in state, and the simulation model is used for carrying out the no-load cutting-in experiment on a variable-flow controller system of a practical double-fed type wind-driven generator, thereby providing real and accurate simulation environment and improving the verifying accuracy.

The invention, which belongs to the technical field of power system operation and control, relates to a real-time-digital-simulator-based modular multi-level converter bridge arm modeling method. A bridge arm hybrid model is established for a bridge arm of a modular multi-level converter (MMC), a simplified equivalent model is established by L special sub modules in the bridge arm, and a detailedequivalent model is established by M common sub modules; modeling of fault states of all devices in the detailed and equivalent sub modules is carried out, so that the model is able to simulate internal faults of the sub modules; and then a fault node is added in the bridge arm model and thus the model is able to simulate a bridge arm fault. Therefore, a problem of resource limitation of modular multi-level converter system simulation by the real-time digital simulator in a GPC/PB5 environment is solved, so that the model can be applied to high-level MMC system simulation; and internal fault simulation of various converters can be completed, so that the study of the MMC protection control strategy is realized well.

The invention provides a direct-current measurement system testing platform of a direct-current power transmission project and a testing method of the direct-current power transmission project, and particularly relates to a direct-current measurement system testing platform of a direct-current power transmission project and a testing method of the direct-current power transmission project on basis of real-time simulation. The testing platform comprises a real-time simulation work station, an RTDS real-time digital simulator, an analog quantity output board card, a light measurement device, a direct-current measurement system and a fault recording device, the real-time simulation work station is connected with the RTDS real-time digital simulator which is connected with the analog quantity output board card, the analog quantity output board card is respectively connected with the light measurement device and the fault recording device, the light measurement device is connected with the direct-current measurement system, and the direct-current measurement system is connected with the fault recording device. The direct-current measurement system testing platform and the testing method can be applied to testing precision and response characteristics of a project actual measurement system and can be used for testing measurement precision, response characteristics and the like of the direct-current measurement system of an actual direct-current power transmission system. The testing method is easy to operate, convenient to use and practical.

The invention discloses a user-defined interface of a wind power station simulation machine and an RTDS (real time digital simulator), and belongs to the technical field of electric power system source network joint simulation modeling and running control. The user-defined interface is used for data communication between the RTDS and a wind power station simulation system and respectively connected with an equivalence rear alternating current and direct current system grid simulation module in the RTDS and an optical fiber communication interface card, the optical fiber communication interface card is connected with a wind power station detailed simulation module in the wind power station simulation system, and the user-defined interface is used for receiving uplink signal data, acquiring instantaneous voltage and an instantaneous phase angle of a wind field access point from the equivalence rear alternating current and direct current system grid simulation module, performing calculation according to the received and acquired data to obtain instantaneous current and transmitting the instantaneous current to the equivalence rear alternating current and direct current system grid simulation module. By the aid of the user-defined interface, grid joint simulation of the wind power station detailed simulation machine and the RTDS is realized.

An all-digital comprehensive simulation platform of a power station achieves graphical modeling of a power station power grid part, a flow net system and a control system. The established simulation models can perform independent simulation calculation of subsystems or devices or the like, united closed-loop computation of all system models of the whole power station, all-digital real-time simulation and simulation analysis experiments. The platform comprises a simulator module, real-time calculated data can be automatically linked with simulator virtual power station monitoring images or equipment variations in virtual equipment or physical subsystems, and then functions of the real-time digital simulator can be achieved. The platform directly calls the simulation models in analysis and computation, and conveniently meets simulation demands of a power station transient process, a middle-and-long term process, a flow network, the control system and the like.

The invention discloses a power grid stability test system containing multiple types of high-penetration new energy based on an RTDS and a method thereof. The stability test system comprises an energy power grid system, an RTDS real-time digital simulator, a simulation data conversion interface, a stability control apparatus and a man-machine interaction interface HMI which are sequentially connected. The RTDS real-time digital simulator is used for sending a high-penetration new energy simulation signal to the simulation data conversion interface. The simulation data conversion interface is used for carrying out mutual information transmission between data containing a high-penetration new energy simulation result analog quantity and a digital quantity and an actual stability control device. The RTDS real-time digital simulator acquires a data signal through simulation and then transmitting data information to the simulation data conversion interface. The stability control apparatus is used for converting a motion operation instruction via the simulation data conversion interface and then sending to the RTDS real-time digital simulator. The invention aims at establishing an electric-power-system real-time digital simulation platform containing multiple types of new energy, and new simulation and detection means are provided for new-energy grid-connected operation coordination development.