CN104052153B - Integrated form element and construction method for the emulation of bulk power grid stable monitoring system RTDS - Google Patents
Integrated form element and construction method for the emulation of bulk power grid stable monitoring system RTDS Download PDFInfo
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Abstract
The invention discloses a kind of can the integrated form element for the emulation of bulk power grid stable monitoring system RTDS of the actual stable monitoring system physical property of accurate simulation and construction method thereof.This integrated form element realizes the copying of whole module by a set of RTDS internal processes, makes the stable monitoring system that structure is complicated, parts are various be integrated into a simple components on RTDS emulation platform.Element can be implanted in RTDS common element storehouse RSCAD/Ulib with file WENKONG.def as universal component, it is simple to modeler one example is multiplex, enables RTDS simulation scale to contain the broad range from a small-sized stability control device to the stable monitoring system of super-huge electrical network.The integrated form element of the present invention has parameter flexibly and arranges and output signal defined function, it is adaptable to stable monitoring system RTDS of random scale emulates, and efficiently solves bulk power grid stable operation state test problem.
Description
Technical Field
The invention belongs to the technical field of simulation experiments of power systems, and particularly relates to an integrated element for RTDS simulation of a large power grid stability monitoring system and a construction method.
Background
The Real-Time Digital simulation system RTDS (Real-Time Digital Simulator) is a Digital dynamic simulation experiment system widely used in the fields of electric power research and engineering in China, and gradually replaces the traditional physical moving model experiment device and off-line software calculation tool due to the accuracy of element parameters and the Real-Time property of the simulation process.
The RTDS is mainly used for closed-loop testing of a power system control protection device up to now and is not used for evaluation and verification of a large power grid safety and stability strategy. The reason for this is two points: firstly, complete set of security monitoring equipment objects of the whole power grid cannot be accessed into an RTDS simulation model, and a large-scale digital-physical closed-loop simulation experiment system cannot be formed; secondly, the existing elements in an RTDS standard element library (RSCAD/Master) are used for building a large-scale safety and stability monitoring system model, time and labor are wasted, the accuracy and the universal applicability of the built model cannot be guaranteed, and a full-digital simulation experiment system for the multi-working-condition dynamic operation of a large power grid is difficult to form.
Disclosure of Invention
The invention aims to provide an integrated element and a construction method for simulation of a large power grid stability monitoring system (RTDS), so that physical properties of an actual stability monitoring system can be accurately simulated, simulation of the RTDS of the stability monitoring system in any scale can be realized, and the requirement of a dynamic test of the large power grid stability operation can be met.
In order to solve the technical problems, the invention adopts the following technical scheme: the integrated element for RTDS simulation of the large power grid stability monitoring system comprises basic units, wherein each basic unit comprises a current calculation module, a power calculation module, an action logic judgment module, an action signal delay module, an action signal pulse processing module and the like, and all functional modules are sequentially connected; the input of the current calculation module is a three-phase current instantaneous value, the input of the power calculation module is a three-phase current and three-phase voltage instantaneous value, the output of the action logic judgment module is 0/1 logic signals, the output of the action signal delay module is a first '1' logic pulse of a 0/1 pulse sequence, and the output of the action signal pulse processing module is the interval time of the '1' logic pulse of a 0/1 pulse sequence.
The integrated element for RTDS simulation of the large power grid stability monitoring system is composed of 1-6 basic units, and the number of action signal output ports of each basic unit is 1-3.
The current calculation module respectively calculates three-phase current effective values based on a trapezoidal integration method and by taking a power frequency period as an integration time constant according to the input three-phase current instantaneous value, and outputs the maximum value of the three-phase current effective values;
the power calculation module calculates an active power average value based on a real-time stepping accumulation method and by taking a power frequency period as an interval constant according to input three-phase current and three-phase voltage instantaneous values, and outputs the power average value;
the action logic judgment module compares the maximum current effective value and the power average value with corresponding load overload action setting values and outputs 0 or 1 logic according to the comparison result;
the action signal delay module starts a countdown function and monitors the action logic state when the action logic is changed from 0 to 1, and 1 or 0 logic is output according to whether the load is overloaded or not when the countdown is finished;
and the action signal pulse processing module processes the action signal into a 1 logic pulse sequence with equal intervals according to the logic continuous state of the overload signal 1 after the time delay action.
Firstly, creating three program files, namely WENKONG.def, wenkong.h and wenkong.c, by using a CBuilder editor of the RTDS; secondly, program codes of three program files are written in sequence, wherein the file WENKONG.def defines the name of the element and the man-machine interaction interface style thereof, and comprises an RTDS interface icon of the element and an element parameter setting dialog box; the document wenkong.h defines the data types of variables and parameters, including the type definitions of input variables, output variables, intermediate variables and setting parameters; the file wenkong.c is a program execution code file, which includes numerical and logical operation execution codes for implementing the simulation function of the element.
Aiming at the defects of the conventional RTDS component library, the inventor constructs an integrated component for RTDS simulation of a large power grid stability monitoring system, which can accurately simulate the physical properties of the actual stability monitoring system based on the combination of a power system simulation technology and a CBuilder custom programming technology, and realizes the simulation functions of all modules by means of a set of RTDS internal programs, so that the stability monitoring system with a complex structure and various components is integrated into a simple component on an RTDS simulation platform. The elements can be used as general elements and are implanted into an RTDS public element library RSCAD/Ulib in a WENKONG. The integrated element has flexible parameter setting and output signal definition functions, is suitable for RTDS simulation of a safety and stability monitoring system of any scale, and effectively solves the problem of dynamic test of safety and stability operation of a large power grid.
Drawings
Fig. 1 is a schematic diagram of a basic unit and input and output signals thereof in an integrated component for RTDS simulation of a large power grid stability monitoring system according to the present invention.
Fig. 2 is a schematic diagram of an integrated element basic parameter setting dialog box for large power grid stability monitoring system RTDS simulation according to the present invention.
FIG. 3 is a schematic diagram of an integrated element setting and time parameter setting dialog box for RTDS simulation of a large power grid stability monitoring system according to the present invention.
Fig. 4 is a schematic diagram of an integrated element intermediate variable name setting dialog box for RTDS simulation of a large power grid stability monitoring system according to the present invention.
Fig. 5 is a schematic diagram of an example effect of applying the present invention.
Detailed Description
Embodiment is used for constructing integrated elements of RTDS simulation of large power grid stability monitoring system
Firstly, three program files, namely WENKONG.def, wenkong.h and wenkong.c, are created by using a CBuilder editor of RTDS; secondly, program codes of three program files are written in sequence, wherein the file WENKONG.def defines the name of the element and the man-machine interaction interface style thereof, and comprises an RTDS interface icon of the element and an element parameter setting dialog box; the document wenkong.h defines the data types of variables and parameters, including the type definitions of input variables, output variables, intermediate variables and setting parameters; the file wenkong.c is a program execution code file, which includes numerical and logical operation execution codes for implementing the simulation function of the element.
The integrated element constructed by the method comprises basic units, wherein each basic unit comprises a current calculation module, a power calculation module, an action logic judgment module, an action signal delay module, an action signal pulse processing module and the like, and all the functional modules are connected in sequence; the input of the current calculation module is a three-phase current instantaneous value, the input of the power calculation module is a three-phase current and three-phase voltage instantaneous value, the output of the action logic judgment module is 0/1 logic signals, the output of the action signal delay module is a first '1' logic pulse of a 0/1 pulse sequence, and the output of the action signal pulse processing module is the interval time of the '1' logic pulse of a 0/1 pulse sequence. Wherein,
the integrated element is composed of 1-6 basic units, and the number of action signal output ports of each basic unit is 1-3. The selectable number of basic units and the selectable number of output ports solve the problem of universality of simulation of RTDS of different stability monitoring systems.
The current calculation module respectively calculates three-phase current effective values based on a trapezoidal integration method and by taking a power frequency period as an integration time constant according to the input three-phase current instantaneous value, and outputs the maximum value of the three-phase current effective values; the numerical difference of the module is calculated as:
In the formula (1), Δ T is a time discrete step length, TbN × Δ t is the power frequency period.
The power calculation module calculates an active power average value based on a real-time stepping accumulation method and by taking a power frequency period as an interval constant according to input three-phase current and three-phase voltage instantaneous values, and outputs the power average value; the numerical difference of the module is calculated as:
The action logic judgment module and the action signal delay module jointly form an element output 1 logic, wherein the action logic judgment module outputs the maximum current effective value IRMSAnd power average value PavRespectively compared with corresponding load overload action setting values Iset and Pset and starts a countdown timer T when the conditions are metjsThe action signal delay module sets a countdown initial parameter Tjs0The element output is locked to '0' logic during the countdown period when Tdelay, so that the logic of the overload action signal '1' output of the element is judged to simultaneously satisfy the following three conditions:
1)IRMS>Iset；
2)Pav>Pset；
3)Tjs＝0。
and the action signal pulse processing module processes the action signal into a 1 logic pulse sequence with equal spacing according to the logic continuous state of the overload signal 1 after the delay action, wherein the time of the pulse spacing is Tmono. Wherein each pulse in the pulse train can be used to control the breaking action of a set of switches (to control a round of the dump generator or dump load operation). Under the normal condition, the overload outlet action of one unit does not exceed three wheels, only 3 paths of first pulses of the pulse sequence are output to form three wheels of actions, and the pulse interval time is irrelevant; in some special cases, however, a unit may require more than three rounds of overload exit actuation, which may set the actuation delay times for each of the three rounds by the pitch time parameter Tmono of the element per exit actuation pulse train.
Application example
As shown in fig. 1, three-phase voltages VA, VB, VC and three-phase currents IA, IB, IC are monitored for a certain power transmission and distribution equipment (rated phase voltage 100kV, rated current 1kA, rated power 300MW) in a power grid; the WENKONG. def element of the embodiment is called from an RTDS public element library RSCAD/Ulib as a stability monitoring system model of the power transmission and distribution equipment, and the basic unit number of the element is set to be 1 in a basic parameter setting dialog box described below.
As shown in fig. 2, the basic parameters of the integrated element include the grid operating frequency, the number of cells and the medium variable monitoring enable. In this example, the grid operating frequency is set to 50Hz, the number of basic units is set to 1, and the intermediate variable is set to a monitorable quantity.
As shown in fig. 3, the integrated element setting value and time parameter includes a current overcurrent action setting value, a power overload action setting value, the number of output ports, an action delay time and a pulse interval time of each output control signal. In the embodiment, the overload of 50% is set as an action setting value, namely the current setting value Iset1 is 1.5kA, and the power setting value Pset1 is 450 MW; the number of output ports is set to 3; the action delay time of the 1-3 paths of output control signals is respectively set to
Tdelay 1-Tdelay 11-0.2 seconds
Tdelay2 Tdelay11+ Tdelay12 (0.2+0.3) sec
Tdelay3 Tdelay11+ Tdelay12+ Tdelay13 (0.2+0.3+0.4) sec
The pulse pitch times Tmono for the 1-3 output control signals are all set to 0.9 seconds.
As shown in fig. 4, the dialog box is only valid when the intermediate variable is set as a monitorable value, and the name of the intermediate variable refers to the name of the variable of the power frequency period current effective value and the power frequency period power average value which are calculated in real time by the internal program according to the input three-phase voltage and current instantaneous value. The example calls the intermediate variable current effective value and the power average value I1 and P1 respectively for simulating runtime state monitoring.
As shown in fig. 5, when the operation condition of the power transmission and transformation equipment in the power grid changes from the normal rated state to the overload 100% state due to the sudden fault and continues the overload state all the time, the integrated element monitoring amounts I1 and P1 respectively reflect the time points when the current and the power exceed the action setting values (Iset1 and Pset1), and the 3-path output control pulse sequence also accurately conforms to the action delay time and the pulse interval time setting.
The integrated element for RTDS simulation of the large power grid stability monitoring system is mainly used for simulating the automatic response of the stability monitoring system in the power grid to the overload fault phenomenon of power transmission and distribution equipment. The verification experiment fully proves that the integrated element of the invention has the following outstanding advantages: 1. the system has the same physical space-time effect as an actual stability monitoring system; 2. the elements are simple and easy to use, and the modeling efficiency of the RTDS simulation experiment for the safe and stable operation of the power grid can be greatly improved; 3. the elements have universality and commonality, so that the simulation scale of the security monitoring system can cover the range of the super-huge power grid.
Claims (3)
1. An integrated element for RTDS simulation of a large power grid stability monitoring system is characterized by comprising basic units, wherein each basic unit comprises a current calculation module, a power calculation module, an action logic judgment module, an action signal delay module, an action signal pulse processing module and the like, and all functional modules are connected in sequence; the input of the current calculation module is a three-phase current instantaneous value, the input of the power calculation module is a three-phase current and three-phase voltage instantaneous value, the output of the action logic judgment module is 0/1 logic signals, the output of the action signal delay module is a first '1' logic pulse of a 0/1 pulse sequence, and the output of the action signal pulse processing module is the interval time of the '1' logic pulse of a 0/1 pulse sequence;
the current calculation module respectively calculates three-phase current effective values based on a trapezoidal integration method and by taking a power frequency period as an integration time constant according to the input three-phase current instantaneous value, and outputs the maximum value of the three-phase current effective values;
the power calculation module calculates an active power average value based on a real-time stepping accumulation method and a power frequency period as an interval constant according to input three-phase current and three-phase voltage instantaneous values, and outputs the active power average value;
the action logic judgment module compares the maximum current effective value and the active power average value with corresponding load overload action setting values and outputs 0 or 1 logic according to the comparison result;
the action signal delay module starts a countdown function and monitors an action logic state when the action logic is changed from 0 to 1, and 1 or 0 logic is output according to whether the load is overloaded or not when the countdown is finished;
and the action signal pulse processing module processes the action signal into a 1 logic pulse sequence with equal intervals according to the logic continuous state of the overload signal 1 after the time delay action.
2. The integrated element for simulation of the RTDS of the large power grid stability monitoring system according to claim 1 is composed of 1-6 basic units, and the number of action signal output ports of each basic unit is 1-3.
3. The method for constructing the integrated element for the RTDS simulation of the large power grid stability monitoring system according to claim 1, wherein the method comprises the following steps: firstly, three program files, namely WENKONG.def, wenkong.h and wenkong.c, are created by using a CBuilder editor of RTDS; secondly, program codes of three program files are written in sequence, wherein the file WENKONG.def defines the name of the element and the man-machine interaction interface style thereof, and comprises an RTDS interface icon of the element and an element parameter setting dialog box; the document wenkong.h defines the data types of variables and parameters, including the type definitions of input variables, output variables, intermediate variables and setting parameters; the file wenkong.c is a program execution code file, which includes numerical and logical operation execution codes for implementing the simulation function of the element.
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