CN104052153A - Integrated element for simulation of RTDS of security monitoring system of large power grid of and construction method thereof - Google Patents

Abstract

The invention discloses an integrated element for simulation of an RTDS of a security monitoring system of a large power grid and capable of simulating actual physical properties of the security monitoring system and a construction method of the integrated element. According to the integrated element, simulation functions of all modules can be achieved by means of a set of internal programs of the RTDS, and the security monitoring system with a complex structure and multiple parts is integrated into a simple element on an RTDS simulation platform. The element can be implanted into an RTDS public element library RSCAD/ Ulib by serving as a universal element in a mode of a file WENKONG.def, a modeler can use one case for multiple purposes, and the RTDS can simulate a small stability control device and also the security monitoring system of a super-large power grid. The integrated element has functions of setting parameters flexibly and defining output signals and is applicable to simulation of the RTDS of the security monitoring system in any scale, and a dynamic test on stable operation of the large power grid is achieved effectively.

Description

Integrated form element and construction method for the stable supervisory control system RTDS emulation of large electrical network

Technical field

The invention belongs to power system simulation experiments technical field, relate in particular to a kind of integrated form element and construction method for the large stable supervisory control system RTDS emulation of electrical network.

Background technology

Real-timedigital simulation system RTDS (Real-Time Digital Simulator) is a kind of digitlization dynamic simulation experiment system of being used widely at China's electric power research and engineering field, because the accuracy of its component parameters and the real-time of simulation process have replaced traditional physics dynamic model experiment device and off-line software computational tool gradually.

RTDS is mainly used in the closed loop test of electric power system control protective device so far, not yet for assessment and the checking of electricity net safety stable strategy greatly.2 points of tracing it to its cause: the one, can not, by the stable watch-dog of whole electrical network complete access RTDS simulation model in kind, cannot form large scale digital-physics closed-loop simulation experimental system; The 2nd, with existing element in RTDS Library of Standard Pieces and Parts (RSCAD/Master), build accuracy and the general applicability that large-scale stable Monitor and Control System had not only wasted time and energy but also can not guarantee institute's established model, be difficult to form the fully digitized simulation experiment system of large electrical network multi-state dynamic operation.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of integrated form element and construction method for the large stable supervisory control system RTDS emulation of electrical network, so that accurately simulate actual stable supervisory control system physical property, realize the stable supervisory control system RTDS emulation of random scale, thereby meet the demand of the stable operation state test of large electrical network.

For solving the problems of the technologies described above, the present invention is by the following technical solutions: for the integrated form element of the large stable supervisory control system RTDS emulation of electrical network, by elementary cell, formed, each elementary cell comprises Current calculation module, power computation module, action logic judge module, actuating signal time delay module and actuating signal burst process module etc., and each functional module is linked in sequence; Wherein, Current calculation module be input as three-phase current instantaneous value, power computation module be input as three-phase current and three-phase voltage instantaneous value, action logic judge module is output as 0/1 logical signal, actuating signal time delay module is output as first ' 1 ' logical pulse of 0/1 pulse train, and actuating signal burst process module is output as the time interval of 0/1 pulse train ' 1 ' logical pulse.

The above-mentioned integrated form element for the large stable supervisory control system RTDS emulation of electrical network, consists of 1～6 elementary cell, and the actuating signal output port number of each elementary cell has 1～3.

Current calculation module, according to the three-phase current instantaneous value of input, is calculated respectively three-phase current effective value based on trapezoidal integration the power frequency period of usining as integration time constant, the maximum in output three-phase current effective value;

Power computation module, according to three-phase current and the three-phase voltage instantaneous value of input, based on real-time stepping summation and using power frequency period as interval constant calculations active power mean value, is exported this power average value;

Action logic judge module is by maximum current effective value and power average value and the comparison of corresponding traffic overload action setting value, according to comparative result output 0 or 1 logic;

Actuating signal time delay module starts countdown function and monitors action logic state during by 0 change 1 at action logic, when countdown finishes, according to traffic overload, whether exports 1 or 0 logic;

Actuating signal burst process module is treated to equally spaced ' 1 ' logical pulse sequence according to the persistent state of ' 1 ' logic of overload signal after deferred action by actuating signal.

The construction method of the above-mentioned integrated form element for the large stable supervisory control system RTDS emulation of electrical network, first, creates WENKONG.def, wenkong.h and tri-program files of wenkong.c with the CBuilder editing machine of RTDS; Secondly, sequentially write the program code of three program files, wherein file WENKONG.def definition element title and human-computer interaction interface style thereof, comprise that RTDS interface icon and the component parameters of element arranges dialog box; The data type of file wenkong.h defined variable and parameter, comprises the type definition of input variable, output variable, intermediate variable and parameters; File wenkong.c is program run time version file, comprises numerical value and the logical operation run time version of realizing element copying.

For the existing defect of existing RTDS component library, inventor based on Simulating technique in Electric Power System in conjunction with CBuilder custom programming technology, built a kind of integrated form element for the large stable supervisory control system RTDS emulation of electrical network that can accurately simulate actual stable supervisory control system physical property, it realizes the copying of whole modules by a set of RTDS internal processes, make complex structure, the various stable supervisory control system of parts on RTDS emulation platform, be integrated into a simple components.Element can be used as universal component and implants in RTDS common element storehouse RSCAD/Ulib with file WENKONG.def, the same with all universal components of RTDS, in a simulation example, can call a plurality of these elements simultaneously, be convenient to modeling person's one example multiplex, make RTDS simulation scale can contain the broad range from a small-sized stability control device to the stable supervisory control system of super-huge electrical network.Integrated form element of the present invention has parameter setting flexibly and output signal defined function, is applicable to the stable supervisory control system RTDS emulation of random scale, efficiently solves the stable operation state test problem of large electrical network.

Accompanying drawing explanation

Fig. 1 is that the present invention is for elementary cell of integrated form element and the input/output signal schematic diagram thereof of the large stable supervisory control system RTDS emulation of electrical network.

To be the present invention arrange dialog box schematic diagram for the integrated form element basic parameter of the large stable supervisory control system RTDS emulation of electrical network to Fig. 2.

To be the present invention arrange dialog box schematic diagram for integrated form element setting value and the time parameter of the large stable supervisory control system RTDS emulation of electrical network to Fig. 3.

To be the present invention arrange dialog box schematic diagram for the integrated form element intermediate variable title of the large stable supervisory control system RTDS emulation of electrical network to Fig. 4.

Fig. 5 is application case effect schematic diagram of the present invention.

Embodiment

Embodiment is for the structure of the integrated form element of the stable supervisory control system RTDS emulation of large electrical network

First, with the CBuilder editing machine of RTDS, create WENKONG.def, wenkong.h and tri-program files of wenkong.c; Secondly, sequentially write the program code of three program files, wherein file WENKONG.def definition element title and human-computer interaction interface style thereof, comprise that RTDS interface icon and the component parameters of element arranges dialog box; The data type of file wenkong.h defined variable and parameter, comprises the type definition of input variable, output variable, intermediate variable and parameters; File wenkong.c is program run time version file, comprises numerical value and the logical operation run time version of realizing element copying.

Press the integrated form element that preceding method builds, by elementary cell, formed, each elementary cell comprises Current calculation module, power computation module, action logic judge module, actuating signal time delay module and actuating signal burst process module etc., and each functional module is linked in sequence; Wherein, Current calculation module be input as three-phase current instantaneous value, power computation module be input as three-phase current and three-phase voltage instantaneous value, action logic judge module is output as 0/1 logical signal, actuating signal time delay module is output as first ' 1 ' logical pulse of 0/1 pulse train, and actuating signal burst process module is output as the time interval of 0/1 pulse train ' 1 ' logical pulse.Wherein,

This integrated form element, consists of 1～6 elementary cell, and the actuating signal output port number of each elementary cell has 1～3.The washability of elementary cell quantity has solved the different versatility problem of stable supervisory control system RTDS emulation with the washability of output port number.

Current calculation module, according to the three-phase current instantaneous value of input, is calculated respectively three-phase current effective value based on trapezoidal integration the power frequency period of usining as integration time constant, the maximum in output three-phase current effective value; The diff calculating formula of module is:

$I_{\mathrm{RMS}}=\max \left\{\begin{array}{c}\frac{\mathrm{\Δt}}{2T_b}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\sqrt{{\mathrm{IA}}_i^2}\\ \frac{\mathrm{\Δt}}{2T_b}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\sqrt{{\mathrm{IB}}_i^2}\\ \frac{\mathrm{\Δt}}{2T_b}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\sqrt{{\mathrm{IC}}_i^2}\end{array}\right.$ Formula (1)

In formula (1), Δ t is time discrete step-length, T _b=N * Δ t is power frequency period.

Power computation module, according to three-phase current and the three-phase voltage instantaneous value of input, based on real-time stepping summation and using power frequency period as interval constant calculations active power mean value, is exported this power average value; The diff calculating formula of module is:

$P_{\mathrm{av}}=\frac{\mathrm{\Δt}}{T_b}\underset{i=1}{\overset{N}{\mathrm{\Σ}}}({\mathrm{VA}}_i\×{\mathrm{IA}}_i+{\mathrm{VB}}_i\×{\mathrm{IB}}_i+{\mathrm{VC}}_i\×{\mathrm{IC}}_i)$ Formula (2)

The common composed component output of action logic judge module and actuating signal time delay module ' 1 ' logic, wherein action logic judge module is by maximum current effective value I _rMSwith power average value P _avrespectively with corresponding traffic overload action setting value Iset with Pset compares and start count-down device T when satisfying condition _js, actuating signal time delay module arranges countdown initial parameters T _js0=Tdelay is also locked as ' 0 ' logic by element output during countdown, and the criterion of element output overloading actuating signal ' 1 ' logic is for meet following three conditions simultaneously like this:

1) I _RMS>Iset；

2) Pav>Pset；

3) T _js＝0。

Actuating signal burst process module is treated to equally spaced ' 1 ' logical pulse sequence according to the persistent state of ' 1 ' logic of overload signal after deferred action by actuating signal, and the pulse distance time is Tmono.Wherein each pulse in pulse train can be used for controlling the disjunction action (control and take turns excision generator or excision load operation) of one group of switch.Generally, the overload of unit outlet action is no more than three-wheel, only needs first pulse of 3 road output pulse sequences can form three-wheel action, and interpulse period is unimportant; But at some in particular cases, a unit may need to be greater than the overload outlet action of three-wheel, and this can arrange by the time interval parameter Tmono of the every way outlet action pulse of element sequence each later wheel of three-wheel and move time of delay.

Application examples

As shown in Figure 1, for a certain equipment for power transmission and distribution in electrical network (specified phase voltage 100kV, rated current 1kA, rated power 300MW), monitor its three-phase voltage VA, VB, VC and three-phase current IA, IB, IC; From RTDS common element storehouse RSCAD/Ulib, call the WENKONG.def element of embodiment as the stable Monitor and Control System of this equipment for power transmission and distribution, and the number of elementary entitles of element is set to 1 in following basic parameter arranges dialog box.

As shown in Figure 2, integrated form element basic parameter comprises that network operation frequency, unit number and intermediate variable monitoring enable.In this example, network operation set of frequency is that 50Hz, number of elementary entitles are set to 1, intermediate variable is set to can monitoring variable.

As shown in Figure 3, integrated form element setting value and time parameter comprise action time of delay and the interpulse period of overcurrent action setting value, power overload action setting value, output port number, every road output control signal.Overload 50% is set for action setting value in this example, current setting is that Iset1=1.5kA, power setting value are Pset1=450MW; Output port number is set to 3; The action of 1-3 road output control signal is set to respectively time of delay

Tdelay1=Tdelay11=0.2 second

Tdelay2=Tdelay11+Tdelay12=(0.2+0.3) second

Tdelay3=Tdelay11+Tdelay12+Tdelay13=(0.2+0.3+0.4) second

The pulse distance time T mono of 1-3 road output control signal is all set to 0.9 second.

As shown in Figure 4, this dialog box is only set under can the condition of monitoring variable just effective at intermediate variable, intermediate variable title refers to internal processes according to the three-phase voltage of input, power frequency period current effective value that current instantaneous value calculates in real time and the variable name of power frequency period power average value.This example is named respectively I1 and P1 by intermediate variable current effective value and power average value, status monitoring during for simulation run.

As shown in Figure 5, when in electrical network, the operating condition of power transmission and transforming equipment becomes overload 100% state and continues this overload always from normal rating state because of catastrophic failure, integrated form element monitoring variable I1 and P1 have reflected that respectively electric current and power surpass the time point of action setting value (Iset1 and Pset1), and 3 road output control pulse sequences also all meet action time of delay and pulse distance set of time accurately.

Integrated form element for the large stable supervisory control system RTDS emulation of electrical network of the present invention be mainly used in the stable supervisory control system of simulating grid to equipment for power transmission and distribution overload fault phenomenon from dynamic response.Confirmatory experiment has fully proved that integrated form element of the present invention has following outstanding advantages: have identical physics tau-effect with actual stable supervisory control system 1.; 2. element is simple and easy to use, can increase substantially the modeling efficiency of the stable operation of electrical network RTDS emulation experiment; 3. element has versatility and public character, makes the simulation scale of stable supervisory control system can contain the scope of super-huge electrical network.

Claims (4)

1. the integrated form element for the large stable supervisory control system RTDS emulation of electrical network, it is characterized in that being formed by elementary cell, each elementary cell comprises Current calculation module, power computation module, action logic judge module, actuating signal time delay module and actuating signal burst process module etc., and each functional module is linked in sequence; Wherein, Current calculation module be input as three-phase current instantaneous value, power computation module be input as three-phase current and three-phase voltage instantaneous value, action logic judge module is output as 0/1 logical signal, actuating signal time delay module is output as first ' 1 ' logical pulse of 0/1 pulse train, and actuating signal burst process module is output as the time interval of 0/1 pulse train ' 1 ' logical pulse.

2. the integrated form element for the large stable supervisory control system RTDS emulation of electrical network according to claim 1, is characterized in that consisting of 1～6 elementary cell, and the actuating signal output port number of each elementary cell has 1～3.

3. the integrated form element for the large stable supervisory control system RTDS emulation of electrical network according to claim 2, is characterized in that:

Described Current calculation module, according to the three-phase current instantaneous value of input, is calculated respectively three-phase current effective value based on trapezoidal integration the power frequency period of usining as integration time constant, the maximum in output three-phase current effective value;

Described power computation module, according to three-phase current and the three-phase voltage instantaneous value of input, based on real-time stepping summation and using power frequency period as interval constant calculations active power mean value, is exported this power average value;

Described action logic judge module is by maximum current effective value and power average value and the comparison of corresponding traffic overload action setting value, according to comparative result output 0 or 1 logic;

Described actuating signal time delay module starts countdown function and monitors action logic state during by 0 change 1 at action logic, when countdown finishes, according to traffic overload, whether exports 1 or 0 logic;

Described actuating signal burst process module is treated to equally spaced ' 1 ' logical pulse sequence according to the persistent state of ' 1 ' logic of overload signal after deferred action by actuating signal.

4. the construction method of the integrated form element for the large stable supervisory control system RTDS emulation of electrical network according to claim 1, it is characterized in that: first, with the CBuilder editing machine of RTDS, create WENKONG.def, wenkong.h and tri-program files of wenkong.c; Secondly, sequentially write the program code of three program files, wherein file WENKONG.def definition element title and human-computer interaction interface style thereof, comprise that RTDS interface icon and the component parameters of element arranges dialog box; The data type of file wenkong.h defined variable and parameter, comprises the type definition of input variable, output variable, intermediate variable and parameters; File wenkong.c is program run time version file, comprises numerical value and the logical operation run time version of realizing element copying.