CN103605558A - Plant-grid communication method for power system machine-grid coordination simulation model - Google Patents

Abstract

A plant-grid communication method for a power system machine-grid coordination simulation model includes: S1, a plant power system simulator transmits output mechanical power PM of a steam turbine to a grid RTDS (real-time digital simulator) through a communication interface; S2, the grid RTDS calculates generator rotor speed omega, generator output power PE and generator end power U; S3, the grid RTDS transmits the data obtained in the step 2 to the grid power system simulator through the communication interface. The method has the advantages that machine-grid joint simulation for a thermal power plant power system and a grid system can be realized, a machine-grid coordination lab platform can be built, features of the power plant and the power grid are studied, and the mutual influence between power plant control equipment, such as speed regulator, and electric control equipment such as an excitation regulator and relay protection is analyzed.

Description

The means of communication in electric system machine net Coordination Simulation Model between power plant and electrical network

Technical field

The present invention relates to the communication means between a kind of realistic model, especially relate to the means of communication between power plant and electrical network in a kind of electric system machine net Coordination Simulation Model.It is exactly particularly the data interactive method between power plant's power system emulator and electrical network Real Time Digital Simulator RTDS.

Background technology

In the evolution of electric system, electric system simulation is being brought into play extremely important effect always.Utilize emulation to study the feasibility of Future Power System project, the performance in prognoses system future and the bottleneck that may exist.Emulation can be analyzed the actual failure condition occurring in electrical network equally effectively, and formulates correct protection and limitation measure.Utilize emulation also can be optimized electrical network, economy and the reliability of the operation of raising system effectively.

Electric system simulation is to set up corresponding model according to original electric system, and calculates and test, dynamic behaviour and the operation characteristic of research electric system in special time.Electric system simulation can be placed on the operation of complication system in laboratory and carry out, and has good controllability, without advantages such as destructiveness and economy.Electrical network Real Time Digital Simulator RTDS is as electro-magnetic transient real-time analysis instrument, and simulation accuracy is high, and speed is fast, can accomplish the emulation that becomes more meticulous.For the complex network that contains high-power high-tension power electronic devices, electrical network Real Time Digital Simulator RTDS is strong emulation tool.

Shortage due to current power plants and grid coordination emulation platform, cause electrical network Real Time Digital Simulator RTDS analogue system and power plant's power system emulator to work alone respectively, can not complete communication and then realize factory's net associative simulation, lack the real-time of data and the authenticity of emulation.

Therefore, electric system needs to realize the platform tools that machine net is coordinated emulation, and the present invention joins together both by means of communication, and then carries out system emulation analysis and calculating, realizes factory's net associative simulation.This can provide for the Accurate Model of thermal power plant's power system data and can with digital simulation device RTDS associative simulation, have more practical significance.

Summary of the invention

Technical matters to be solved by this invention, put forward exactly the means of communication between power plant and electrical network in a kind of electric system machine net Coordination Simulation Model of arch, realize the data interaction between power plant's power system emulator and electrical network Real Time Digital Simulator RTDS, and the real-time of data and the authenticity of emulation are all effectively guaranteed, realize factory's net associative simulation.

Solve the problems of the technologies described above, the technical solution adopted in the present invention is:

Means of communication in electric system machine net Coordination Simulation Model between power plant and electrical network, is characterized in that: comprise the following steps:

S1 power plant power system emulator is steam turbine output mechanical power P _mby communication interface, send to electrical network Real Time Digital Simulator RTDS;

S2 electrical network Real Time Digital Simulator RTDS calculates generator amature rotational speed omega, generator electromotive power output P according to formula (1), formula (2) and formula (3) _eand generator end electricity U;

$\mathrm{\ω}=\frac{\mathrm{d\θ}}{\mathrm{dt}}---\left(1\right)$

$P_E=P_M-\frac{T_J}{{\mathrm{\ω}}_0}\·\frac{\mathrm{d\ω}}{\mathrm{dt}}---\left(2\right)$

$U=\frac{P_E}{I}---\left(3\right)$

In formula, T _jfor the inertia time constant of genset, the mechanical angle displacement that θ is rotor, t is the time, I is dynamo current;

S3 electrical network Real Time Digital Simulator RTDS sends to power plant's power system emulator by step S2 gained by communication interface;

Communication interface between described electrical network Real Time Digital Simulator RTDS and power plant's power system emulator, specifically by the GTNET card of analog to digital conversion or digital-to-analog conversion A/D-D/A card or RTDS, realize, the data interaction of RTDS analogue system and external device is undertaken by RTDS/GTNET card, adopts DNP3.0 (Distributed Network Protocol) stipulations; On original RTDS model basis, build DNP model, and be each DNP model binding RTDS-DNP point mapped file.

The communications and data of realizing between thermal power plant's power system and RTDS digital simulation device by said method exchanges, thus realize factory's net associative simulation and analyze power plant's opertaing devices such as speed regulator and the electrical control gear such as field regulator, relay protection between influence each other.

Compared with prior art, the invention has the beneficial effects as follows: a communication difficult problem that has solved current factory net associative simulation, make it to be applied to factory's net associative simulation, can overcome a difficult problem for the ruuning situation of simulating grid and power plant separately, realize better the emulation of electrical network and power plant's operation conditions, there is higher reliability and authenticity.

Accompanying drawing explanation

Fig. 1 is the interface schematic diagram between electrical network Real Time Digital Simulator RTDS and power plant's power system emulator;

Fig. 2 is synchronous generator interface schematic diagram in electrical network Real Time Digital Simulator RTDS;

Fig. 3 is the GTNET-DNP model for communicating by letter of building on electrical network Real Time Digital Simulator RTDS model basis;

Fig. 4 is the pusher side machine torque T that generates electricity in embodiment _mchange curve;

Fig. 5 is the change curve of generator amature rotational speed omega in embodiment;

Fig. 6 is the change curve of three-phase current in embodiment.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Referring to Fig. 1, the means of communication in electric system machine net Coordination Simulation Model of the present invention between power plant and electrical network, comprise the following steps:

S1 power plant power system emulator is steam turbine output mechanical power P _mby communication interface, send to electrical network Real Time Digital Simulator RTDS;

S2 electrical network Real Time Digital Simulator RTDS calculates generator amature rotational speed omega, generator electromotive power output P according to formula (1), formula (2) and formula (3) _eand generator end electricity U;

$\mathrm{\ω}=\frac{\mathrm{d\θ}}{\mathrm{dt}}---\left(1\right)$

$P_E=P_M-\frac{T_J}{{\mathrm{\ω}}_0}\·\frac{\mathrm{d\ω}}{\mathrm{dt}}---\left(2\right)$

$U=\frac{P_E}{I}---\left(3\right)$

In formula, T _jfor the inertia time constant of genset, the mechanical angle displacement that θ is rotor, t is the time, I is dynamo current;

S3 electrical network Real Time Digital Simulator RTDS sends to power plant's power system emulator by step S2 gained by communication interface;

Communication interface between described electrical network Real Time Digital Simulator RTDS and power plant's power system emulator, specifically by the GTNET card of analog to digital conversion or digital-to-analog conversion A/D-D/A card or RTDS, realize, the data interaction of RTDS analogue system and external device is undertaken by RTDS/GTNET card, adopts DNP3.0 (Distributed Network Protocol) stipulations.

Referring to Fig. 3, for realizing the mutual of RTDS and software platform place workstation and communicating by letter, need on original RTDS model basis, build DNP model, and be that each DNP model is bound RTDS-DNP point mapped file.

Generator and steam turbine in electric system link together by rotor, and power plant's power system emulator calculates steam turbine output mechanical power P _m, sending to the generator model in RTDS, RTDS calculates generator amature rotational speed omega, generator electromotive power output P _eafter giving power plant's power system emulator.If Fig. 2 is the generator interface model of RTDS, the mechanical output P that it provides for receiving thermal power plant's power system _m, and can be to the electromagnetic power P of power system side reaction generator _eand the rotational speed omega of generator.

The data interaction of RTDS analogue system and external device is undertaken by RTDS/GTNET card, employing be DNP3.0 stipulations.For realizing the mutual of RTDS and software platform place workstation, on original RTDS model basis, build DNP model, and be each DNP model binding RTDS-DNP point mapped file.The GTNET card of RTDS is for testing the smart machines such as digital protection, to design specially, supports DNP3.0 stipulations, and a GTNET card can be communicated by letter by while and outside 5 intelligent apparatus.

Machine net based on unified is coordinated lab platform and can to the characteristic of power plant and electrical network, be studied simultaneously, analyzes influencing each other between the electrical control gears such as power plant's opertaing devices such as speed regulator and field regulator, relay protection.

For utilizing the simulation example of above-mentioned thermal power plant and electrical network Real Time Digital Simulator interface, example carries out the emulation of transmission line of electricity generation singlephase earth fault to one machine infinity bus system below.

The mechanical output P of the steam turbine output of thermal power plant _mby the interface between electrical network Real Time Digital Simulator RTDS and power plant's power system emulator, be sent to electrical network Real Time Digital Simulator RTDS generator module, with machine torque T _mform act on generator amature, the rotor speed ω of electrical network Real Time Digital Simulator RTDS side generator is sent to thermal power plant's power system side by the interface between electrical network Real Time Digital Simulator RTDS and power plant's power system emulator simultaneously, for power system side, carry out speed regulating control, maintain turbine rotor rotating speed and keep constant.

Simulation result is as shown in Fig. 4, Fig. 5 and Fig. 6.Wherein Fig. 4 is generating pusher side machine torque T _mchange curve; Fig. 5 is the change curve of generator amature rotational speed omega; Fig. 6 is the change curve of transmission line malfunction side three-phase current.

From simulation result, machine net is coordinated analogue system can stable operation, simulation result can embody the operation conditions of practical power systems, and thermal power plant and electrical network Real Time Digital Simulator interface operational excellence can realize the associative simulation of thermal power plant and electrical network Real Time Digital Simulator RTDS preferably.

Claims (1)

1. means of communication between power plant and electrical network in electric system machine net Coordination Simulation Model, is characterized in that: comprise the following steps:

S1 power plant power system emulator is steam turbine output mechanical power P _mby communication interface, send to electrical network Real Time Digital Simulator RTDS;

S2 electrical network Real Time Digital Simulator RTDS calculates generator amature rotational speed omega, generator electromotive power output P according to formula (1), (2) and (3) _eand generator end electricity U;

$\mathrm{\ω}=\frac{\mathrm{d\θ}}{\mathrm{dt}}---\left(1\right)$

$P_E=P_M-\frac{T_J}{{\mathrm{\ω}}_0}\·\frac{\mathrm{d\ω}}{\mathrm{dt}}---\left(2\right)$

$U=\frac{P_E}{I}---\left(3\right)$

In formula, T _jfor the inertia time constant of genset, the mechanical angle displacement that θ is rotor, t is the time, I is dynamo current;

S3 electrical network Real Time Digital Simulator RTDS sends to power plant's power system emulator by step S2 gained by communication interface;

Communication interface between described electrical network Real Time Digital Simulator RTDS and power plant's power system emulator, realizes by the GTNET card of analog to digital conversion or digital-to-analog conversion A/D-D/A card or RTDS; The data interaction of RTDS analogue system and external device is undertaken by RTDS/GTNET card, adopts DNP3.0 stipulations; On original RTDS model basis, build DNP model, and be each DNP model binding RTDS-DNP point mapped file.

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