CN103414183A - Method for simulating dynamic load in numerical simulation model - Google Patents
Method for simulating dynamic load in numerical simulation model Download PDFInfo
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- CN103414183A CN103414183A CN2013102842762A CN201310284276A CN103414183A CN 103414183 A CN103414183 A CN 103414183A CN 2013102842762 A CN2013102842762 A CN 2013102842762A CN 201310284276 A CN201310284276 A CN 201310284276A CN 103414183 A CN103414183 A CN 103414183A
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Abstract
The invention discloses a method for simulating a dynamic load in a numerical simulation model. The method comprises the following contents of selecting a circuit formed by the parallel connection of a variable resistor and an inductor as a primary loop of a dynamic load; simulating the active power and reactive power curves of actual dynamic load, calculating a variable resistance value and an inductance value, and realizing the change of the dynamic load according to an expected curve through controlling the variable resistance and the inductance. According to the method, the accurate, simple and effective dynamic load modeling can be realized.
Description
Technical field
The invention belongs to the dynamic load modeling technical field in electric power system, particularly a kind of method of simulating dynamic load in numerical simulation model.
Background technology
In recent years, the research stability of electric power system under various disturbances that develops into of electric power system technology of numerical simulation provides a kind of economy, means easily.Dynamic load, as common Power System Disturbances, has periodicity or aperiodicity, the meritorious and idle load altered a great deal suddenly.Setting up accurately dynamic load model is to analyze the basis of dynamic load on the power system transient stability impact.
Common electric power system numerical simulation software mainly contains BPA and PSCAD.In such numerical simulation software, often there is no dynamic load model, variable resistor/inductor models only is provided.Therefore, in order to analyze the impact of dynamic load on power system transient stability, utilize the base components such as variable resistor/inductance to set up that dynamic load model is very necessary accurately.
Publication number CN102184296A discloses a kind of impact load of electric railway based on measured data modeling method, the method is selected the monitoring point of electric railway and monitoring device is installed, determine the part throttle characteristics recorder data startup value with this specific load of electric railway, start wave recording device and record real-time voltage and current data, utilize Monitoring Data to set up the load model of electric iron impact load, and model parameter is carried out to the identification checking.The method needs a plurality of model parameters are carried out to identification in implementation process, greatly increased the complexity of model.
Summary of the invention
Purpose of the present invention, be to provide a kind of method of simulating dynamic load in numerical simulation model, and it can be realized accurately, simple, effective dynamic load modeling.
In order to reach above-mentioned purpose, the technical solution adopted in the present invention is:
A kind of method of simulating dynamic load in numerical simulation model, comprise the steps:
(1) choose the primary circuit of the loop of variable resistor and inductance in parallel formation as dynamic load;
(2) active power and the reactive power curve of the actual dynamic load of simulation, calculate variable resistance and inductance value, realizes that by controlling variable resistor and inductance dynamic load changes according to expecting curve.
In above-mentioned steps (1), the primary circuit of dynamic load comprises single-phase loop and three-phase loop.
Above-mentioned single-phase loop only comprises the two ends of a ，Gai shunt circuit, shunt circuit consisted of variable resistor and inductance in parallel and all accesses electrical network.
Above-mentioned three-phase loop refers to and comprises three shunt circuits that consist of variable resistor and inductance in parallel, comprise the star-like loop of three-phase and three two kinds, phase angle type loop structures, wherein, the structure in the star-like loop of three-phase is: the head end of described three shunt circuits all connects electrical network, and the tail end short circuit; The structure in three phase angle type loops is: described three shunt circuits order is end to end successively, and the head end of three shunt circuits all is connected to electrical network.
In above-mentioned steps (2), the calculating of variable resistance and inductance value is divided into single-phase loop and two kinds, three-phase loop computational methods according to loop structure;
In single-phase loop, the computational methods of variable resistance R and inductance value L are:
Wherein, U is single-phase loop electrical network phase voltage effective value, and P is dynamic load active power, and Q is the dynamic load reactive power;
For the three-phase loop, the computational methods of variable resistance R and inductance value L are:
Wherein, U is three-phase loop grid line voltage effective value, and P is dynamic load active power, and Q is the dynamic load reactive power.
In above-mentioned steps (2), when simulation dynamic load power curve, at first by on-the-spot wave recording device, record the load power data, then this data importing Numeral Emulation System is obtained simulating the dynamic load power curve, or by curve-fitting method, obtain simulating the dynamic load power curve according to described data.
After adopting said method, the invention has the beneficial effects as follows: the present invention changes according to expecting curve by variable resistor and inductance simulation dynamic load, method accurately, simply, effectively, be applicable to the modeling of dynamic load in Numeral Emulation System, the especially modeling of dynamic load in the PSCAD Numeral Emulation System.
The accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is the structural representation in the single-phase loop of dynamic load in the present invention;
Fig. 3 is the structural representation in the star-like loop of dynamic load three-phase in the present invention;
Fig. 4 is the structural representation in dynamic load three phase angle type loops in the present invention;
Fig. 5 is the active power curve synoptic diagram of exemplary dynamic load in the present invention;
Fig. 6 is the reactive power curve synoptic diagram of exemplary dynamic load in the present invention;
Fig. 7 is the structured flowchart of step generator, di/dt inhibitor and adder match load power.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme of the present invention is elaborated.
As shown in Figure 1, a kind of method of simulating dynamic load in numerical simulation model of the present invention, comprise the steps:
(1) choose the primary circuit of the loop of variable resistor and inductance in parallel formation as dynamic load, described dynamic load loop comprises single-phase loop and three-phase loop, wherein, single-phase loop mainly refers to single-phase loop structure shown in Figure 2, electrical network is all accessed at its two ends that only comprise a ，Gai shunt circuit, shunt circuit consisted of variable resistor and inductance in parallel; The three-phase loop refers to and comprises three shunt circuits that consist of variable resistor and inductance in parallel, during concrete the connection, comprise the star-like loop of three-phase and three two kinds, phase angle type loop structures, as shown in Figure 3, it is the structure in the star-like loop of three-phase, the head end of described three shunt circuits (can be defined as all near the variable resistor end or all near the inductance end according to actual conditions) all connects electrical network, and the tail end short circuit; Shown in Figure 4 is the johning knot composition in three phase angle type loops, and three shunt circuit orders are end to end successively, and the head end of three shunt circuits all is connected to electrical network;
(2) active power and the reactive power curve of the actual dynamic load of simulation, calculate variable resistance and inductance value, realizes that by controlling variable resistor and inductance dynamic load changes according to expecting curve.
When simulation dynamic load power curve, at first by on-the-spot wave recording device, record the load power data, then this data importing Numeral Emulation System is obtained simulating the dynamic load power curve, or by curve-fitting method, obtain simulating the dynamic load power curve according to described data.
As shown in Figure 5, be the exemplary dynamic load active power change curve of a specific embodiment of the present invention, and shown in Figure 6 be corresponding reactive power change curve, all with ordinate, mean power (active-power P, reactive power Q), abscissa means time t.From figure, from t1 constantly, active power remains unchanged after with the speed of 3MW/s, rising to 1.5MW from 0, reactive power rises to 0.5Mvar with the speed of 1Mvar/s from 0, then remains unchanged; From t2 constantly, active power rises to 3MW with the speed of 3MW/s from 1.5MW, then remains unchanged, reactive power rises to 1Mvar with the speed of 1Mvar/s from 0.5Mvar, then remains unchanged; From t3 constantly, active power drops to 1.5MW with the speed of 3MW/s from 3MW, then remains unchanged, reactive power drops to 0.5Mvar with the speed of 1Mvar/s from 1Mvar, then remains unchanged; From t4 constantly, active power drops to 0 with the speed of 3MW/s from 1.5MW, then remains unchanged, reactive power drops to 0 with the speed of 1Mvar/s from 0.5Mvar, then remains unchanged.
As shown in Figure 7, it is the execution mode that utilizes load power curve in curve-fitting method simulation drawing 5 and Fig. 6, concrete step generator, di/dt inhibitor and the adder adopted in Numeral Emulation System, during specific implementation, Fig. 5 and load power curve shown in Figure 6 are split as to four sections power change procedures, by step generator, every section power change procedure of di/dt inhibitor simulation, the generation of step generator is the load variations moment constantly, respectively moment t1, t2, t3, the t4 in corresponding diagram 5 and Fig. 6.The steady-state value of step generator is the load variations amplitude, and the step generator stable state amplitude in corresponding diagram 5 is 1.5MW, and the step generator stable state amplitude in corresponding diagram 6 is 0.5Mvar; The di/dt inhibitor is climbing or the rate of descent of load variations, and the di/dt inhibitor size in corresponding diagram 5 is 3MW/s, and the di/dt inhibitor size in corresponding diagram 6 is 1Mvar/s; Four groups of step generators, di/dt inhibitor are passed through adder addition match load power curve.
The calculating of variable resistance and inductance value is divided into single-phase loop and two kinds, three-phase loop computational methods according to loop structure.
In single-phase loop, the computational methods of variable resistance R and inductance value L are:
Wherein, U is single-phase loop electrical network phase voltage effective value, and P is dynamic load active power, and Q is the dynamic load reactive power.
For the three-phase loop structure, the computational methods of variable resistance R and inductance value L are:
Wherein, U is three-phase loop grid line voltage effective value, and P is dynamic load active power, and Q is the dynamic load reactive power.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposed according to the present invention, and any change of doing on the technical scheme basis, within all falling into protection range of the present invention.
Claims (6)
1. the method for a simulation dynamic load in numerical simulation model, is characterized in that comprising the steps:
(1) choose the primary circuit of the loop of variable resistor and inductance in parallel formation as dynamic load;
(2) active power and the reactive power curve of the actual dynamic load of simulation, calculate variable resistance and inductance value, realizes that by controlling variable resistor and inductance dynamic load changes according to expecting curve.
As claimed in claim 1 a kind of in numerical simulation model the simulation dynamic load method, it is characterized in that: in described step (1), the primary circuit of dynamic load comprises single-phase loop and three-phase loop.
As claimed in claim 2 a kind of in numerical simulation model the method for simulation dynamic load, it is characterized in that: described single-phase loop only comprises the two ends of a ，Gai shunt circuit, shunt circuit consisted of variable resistor and inductance in parallel and all accesses electrical network.
As claimed in claim 2 a kind of in numerical simulation model the simulation dynamic load method, it is characterized in that: described three-phase loop refers to and comprises three shunt circuits that consist of variable resistor and inductance in parallel, comprise the star-like loop of three-phase and three two kinds, phase angle type loop structures, wherein, the structure in the star-like loop of three-phase is: the head end of described three shunt circuits all connects electrical network, and the tail end short circuit; The structure in three phase angle type loops is: described three shunt circuits order is end to end successively, and the head end of three shunt circuits all is connected to electrical network.
As claimed in claim 2 a kind of in numerical simulation model the simulation dynamic load method, it is characterized in that: in described step (2), the calculating of variable resistance and inductance value is divided into single-phase loop and two kinds, three-phase loop computational methods according to loop structure;
In single-phase loop, the computational methods of variable resistance R and inductance value L are:
Wherein, U is single-phase loop electrical network phase voltage effective value, and P is dynamic load active power, and Q is the dynamic load reactive power;
For the three-phase loop, the computational methods of variable resistance R and inductance value L are:
Wherein, U is three-phase loop grid line voltage effective value, and P is dynamic load active power, and Q is the dynamic load reactive power.
As claimed in claim 1 a kind of in numerical simulation model the simulation dynamic load method, it is characterized in that: in described step (2), when simulation dynamic load power curve, at first by on-the-spot wave recording device, record the load power data, then this data importing Numeral Emulation System is obtained simulating the dynamic load power curve, or by curve-fitting method, obtain simulating the dynamic load power curve according to described data.
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Citations (4)
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| CN101777765A (en) * | 2010-01-27 | 2010-07-14 | 中国电力科学研究院 | On-line load simulation method of power system |
| CN101819606A (en) * | 2010-01-27 | 2010-09-01 | 中国电力科学研究院 | Modeling method for common static load component models for power system simulation |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1248210A2 (en) * | 2001-04-06 | 2002-10-09 | Nec Corporation | Method and apparatus for preparing a simulation model for semiconductor integrated circuit at power supply terminal for simulating electromagnetic interference |
| CN101282039A (en) * | 2008-05-09 | 2008-10-08 | 天津大学 | Method of polymerization of induction motor load dynamic parameter taking account of slip and load factor |
| CN101777765A (en) * | 2010-01-27 | 2010-07-14 | 中国电力科学研究院 | On-line load simulation method of power system |
| CN101819606A (en) * | 2010-01-27 | 2010-09-01 | 中国电力科学研究院 | Modeling method for common static load component models for power system simulation |
Non-Patent Citations (1)
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