CN103336874A - Electrical power system subsynchronous oscillation on-line analyzing and early-warning method based on time-domain simulation - Google Patents
Electrical power system subsynchronous oscillation on-line analyzing and early-warning method based on time-domain simulation Download PDFInfo
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Abstract
The invention provides an electrical power system subsynchronous oscillation on-line analyzing and early-warning method based on time-domain simulation. The electrical power system subsynchronous oscillation on-line analyzing and early-warning method based on time-domain simulation comprises the following steps that a subsynchronous oscillation original time-domain simulation model is built; a subsynchronous oscillation current working condition time-domain simulation model is formed; a subsynchronous oscillation adjacent working condition time-domain simulation model is formed; electromagnetic transient time-domain simulation calculation is conducted, simulation results are analyzed, the analyzed results are gathered, and subsynchronous oscillation early-warning information is provided. According to the electrical power subsynchronous oscillation on-line analyzing and early-warning method based on the time-domain simulation, current working condition is captured in a timing mode, the risks of the occurrence of subsynchronous oscillation under all kinds of adjacent working conditions of the current working condition, and early-warning information is provided. The electrical power system subsynchronous oscillation on-line analyzing and early-warning method based on the time-domain simulation overcomes the defects that offline analyzing has a lot of working conditions, and is large in calculation amount and incomplete in working condition coverage.
Description
Technical field
The invention belongs to technical field of power systems, be specifically related to a kind of subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation.
Background technology
Subsynchronous oscillation of electrical power system is a kind of subsynchronous frequency mechanical-electric coupling oscillatory occurences between electrical system and the rotor of turbogenerator set mechanical system, can produce fatigue loss to generator unit shaft system, causes the shaft system of unit damage accident under the serious situation.
At present for the venture analysis of subsynchronous oscillation of electrical power system, common have frequency sweep method, eigenvalue Method, a time-domain-simulation method etc., all is the modes that adopt off-line analysis in application.Because the sub-synchronous oscillation risk is relevant with the method for operation of system, comprise that the throwing of generator is moved back, exert oneself, circuit in the system, the throwing of benefit, transformer etc. of going here and there are moved back etc., the capital exerts an influence to the sub-synchronous oscillation risk, therefore, for every kind of operating condition, all to analyze respectively.In actual engineering, the calculated amount of sub-synchronous oscillation off-line analysis is quite big, is difficult to cover all operating conditions.
At present, for the analytical approach of subsynchronous oscillation of electrical power system, be applied to mainly containing in the engineering reality:
1) frequency sweeping analytic approach.System impedance under the different frequency is scanned, according to the characteristic of system impedance with frequency change, find out the operating mode that wherein may have the sub-synchronous oscillation risk.
2) eigenvalue Method.The equation of describing genset mechanical dynamic process and generator, electric network electromagnet transient process is carried out linearization process, judge the stability of system by the eigenwert of solving system matrix of coefficients.
3) time-domain-simulation analytic approach.Set up the realistic model of genset and electrical network, by the time-domain-simulation analysis, the response condition when disturbance takes place in simulation thereby whether observation shafting torsional oscillation takes place is dispersed.
In addition, also have moment coefficient method, unit function coefficient method etc. again.Above-described method is all only seen at present and is applied to off-line analysis.
Because the sub-synchronous oscillation risk is directly related with the method for operation of system, therefore, for sub-synchronous oscillation risk off-line analysis, the permutation and combination of exerting oneself of state, each genset etc. is moved back in throwing that need to consider various elements, send network for general thermal power plant, the quantity of comprise genset, transformer, sending elements such as circuit and adjacent lines be about ten several to dozens of, the system operation mode after full the arrangement can reach up to ten thousand kinds even more.
For frequency sweep method, owing to only considered that power plant sends the impedance frequency characteristic of system, and do not consider the inherent characteristic of genset, be a kind of rough appraisal procedure therefore.
For eigenvalue Method, the matrix of coefficients that forms after generator and the system model linearization process is multiplied with the element number, can reach more than the hundreds of thousands for complication system, is difficult to accurately find the solution its eigenwert.
Summary of the invention
In view of above deficiency, the present invention proposes a kind of subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation, regularly obtain current working, analyze the risk that sub-synchronous oscillation takes place under the various contiguous operating mode of current working, and provide early warning information.This method has avoided that the operating mode that exists in the off-line analysis is many, calculated amount big, operating mode covers infull shortcoming.
In order to realize the foregoing invention purpose, the present invention takes following technical scheme:
A kind of subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation is provided, said method comprising the steps of:
Step 1: set up the original time domain simulation model of sub-synchronous oscillation;
Step 2: form sub-synchronous oscillation current working time domain simulation model;
Step 3: form the contiguous operating mode time domain simulation model of sub-synchronous oscillation;
Step 4: carry out the electro-magnetic transient time-domain-simulation and calculate, analyze simulation result, and analysis result is gathered, provide the sub-synchronous oscillation early warning information.
The original time domain simulation model of sub-synchronous oscillation comprises that generator unit shaft system model and power plant send the system equivalent network in the described step 1;
Described generator unit shaft system model adopts concentrates the matter block models, and comprises the matter piece parameter of each matter piece;
Described power plant sends the system equivalent network, is about to power plant and sends system and carry out the Dai Weinan equivalence, only keeps the nearer element of electrical distance, then is reduced to equivalent power supply and equivalent impedance for far-end network.
Described matter block models comprises high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and generator, and described matter piece parameter comprises each modal damping coefficient of moment of inertia, interblock elasticity coefficient and unit.
In the described step 2, regularly from the dispatching of power netwoks operational system, obtain current network topology and flow data, and the throwing that respectively keeps element in the original time domain simulation model of described sub-synchronous oscillation moved back situation and the genset situation of exerting oneself is upgraded, form sub-synchronous oscillation current working time domain simulation model, make this sub-synchronous oscillation current working time domain simulation model meet current system conditions.
In the described step 3, on the basis of sub-synchronous oscillation current working time domain simulation model, respectively each throwing situation of moving back that keeps element is changed, and carry out permutation and combination, form the contiguous operating mode time domain simulation model of sub-synchronous oscillation, the contiguous operating mode time domain simulation model of sub-synchronous oscillation reflects the contiguous operating mode of current operating condition, and the contiguous operating mode time domain simulation model of sub-synchronous oscillation is committed to the simulation calculation platform.
In the described step 4, the contiguous operating mode time domain simulation model of the sub-synchronous oscillation that is committed to the simulation calculation platform is carried out the electro-magnetic transient time-domain-simulation to be calculated, analyze simulation result, and analysis result is gathered, form the sub-synchronous oscillation early warning information that this power plant sends the current operating condition of system.The sub-synchronous oscillation early warning information sends to the management and running personnel reference of electrical network, in order to avoid existing the operating mode of big sub-synchronous oscillation risk in scheduling.
Compared with prior art, beneficial effect of the present invention is:
1) the sub-synchronous oscillation on-line analysis method that proposes of the present invention only need be considered the contiguous operating mode of current working, need consider that with off-line analysis all operating modes compare, and calculated amount reduces greatly;
2) after carrying out the sub-synchronous oscillation venture analysis in the various contiguous operating mode to current working, gathering, assess, early warning information is sent to the dispatching of power netwoks operations staff, operating mode averts danger.
Description of drawings
Fig. 1 is based on subsynchronous oscillation of electrical power system on-line analysis and the method for early warning process flow diagram of time-domain-simulation.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
As Fig. 1, a kind of subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation is provided, said method comprising the steps of:
Step 1: set up the original time domain simulation model of sub-synchronous oscillation;
Step 2: form sub-synchronous oscillation current working time domain simulation model;
Step 3: form the contiguous operating mode time domain simulation model of sub-synchronous oscillation;
Step 4: carry out the electro-magnetic transient time-domain-simulation and calculate, analyze simulation result, and analysis result is gathered, provide the sub-synchronous oscillation early warning information.
The original time domain simulation model of sub-synchronous oscillation comprises that generator unit shaft system model and power plant send the system equivalent network in the described step 1;
Described generator unit shaft system model adopts concentrates the matter block models, and comprises the matter piece parameter of each matter piece;
Described power plant sends the system equivalent network, is about to power plant and sends system and carry out the Dai Weinan equivalence, only keeps the nearer element of electrical distance, then is reduced to equivalent power supply and equivalent impedance for far-end network.
Described matter block models comprises high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and generator, and described matter piece parameter comprises each modal damping coefficient of moment of inertia, interblock elasticity coefficient and unit.
In the described step 2, regularly from the dispatching of power netwoks operational system, obtain current network topology and flow data, and the throwing that respectively keeps element in the original time domain simulation model of described sub-synchronous oscillation moved back situation and the genset situation of exerting oneself is upgraded, form sub-synchronous oscillation current working time domain simulation model, make this sub-synchronous oscillation current working time domain simulation model meet current system conditions.
In the described step 3, on the basis of sub-synchronous oscillation current working time domain simulation model, respectively each throwing situation of moving back that keeps element is changed, and carry out permutation and combination, form the contiguous operating mode time domain simulation model of sub-synchronous oscillation, the contiguous operating mode time domain simulation model of sub-synchronous oscillation reflects the contiguous operating mode of current operating condition, and the contiguous operating mode time domain simulation model of sub-synchronous oscillation is committed to the simulation calculation platform.
In the described step 4, the contiguous operating mode time domain simulation model of the sub-synchronous oscillation that is committed to the simulation calculation platform is carried out the electro-magnetic transient time-domain-simulation to be calculated, analyze simulation result, and analysis result is gathered, form the sub-synchronous oscillation early warning information that this power plant sends the current operating condition of system.The sub-synchronous oscillation early warning information sends to the management and running personnel reference of electrical network, in order to avoid existing the operating mode of big sub-synchronous oscillation risk in scheduling.
Below feasibility of the present invention is analyzed:
1) analytical approach feasibility
The time-domain-simulation analytic approach is subsynchronous oscillation of electrical power system problem analysis method comparatively commonly used in the present actual engineering, also is comparatively one of accurate analytical method of present result of calculation of generally acknowledging.On-line analysis and method for early warning that the present invention proposes for the simulation calculation of single operating mode, are consistent with off-line analysis.
2) calculated amount feasibility
Suppose and exist N independently can throw the element that moves back in the system.For off-line analysis, need in theory to consider that all possible element throws the permutation and combination of the situation of moving back, the operating mode quantity that then needs to consider is 2
NAnd for on-line analysis, only needing to consider the contiguous operating mode (can only consider the operating mode that one or two element only changes usually) of current working needs the operating mode quantity of consideration to be
By contrast, the calculated amount of off-line analysis reduces greatly, and especially in more for element, complicated system, this advantage is more obvious.
In sub-synchronous oscillation was analyzed, typical power plant sends that system generally includes threw and moves back number of elements and be about tens to tens.Estimation thus, for traditional sub-synchronous oscillation off-line analysis, the operating mode that needs to consider is thousands of kinds, and is the index increase with the increase of considering number of elements, can reach 1,000,000 kinds even more for complex network; And the sub-synchronous oscillation on-line analysis method that the present invention proposes, every take turns the operating mode that needs in the analysis to consider only be tens kinds to hundreds of.
Calculation and Analysis Platform commonly used at present is computer cluster, can comprise tens computing nodes in the middle-size and small-size group system usually.And be about a minute level computing time of the single calculation task of subsynchronous oscillation of electrical power system, as a rule, adopt middle-size and small-size computer cluster platform namely can satisfy the needs of sub-synchronous oscillation on-line analysis.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. based on subsynchronous oscillation of electrical power system on-line analysis and the method for early warning of time-domain-simulation, it is characterized in that: said method comprising the steps of:
Step 1: set up the original time domain simulation model of sub-synchronous oscillation;
Step 2: form sub-synchronous oscillation current working time domain simulation model;
Step 3: form the contiguous operating mode time domain simulation model of sub-synchronous oscillation;
Step 4: carry out the electro-magnetic transient time-domain-simulation and calculate, analyze simulation result, and analysis result is gathered, provide the sub-synchronous oscillation early warning information.
2. subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation according to claim 1, it is characterized in that: the original time domain simulation model of sub-synchronous oscillation comprises that generator unit shaft system model and power plant send the system equivalent network in the described step 1;
Described generator unit shaft system model adopts concentrates the matter block models, and comprises the matter piece parameter of each matter piece;
Described power plant sends the system equivalent network, is about to power plant and sends system and carry out the Dai Weinan equivalence, only keeps the nearer element of electrical distance, then is reduced to equivalent power supply and equivalent impedance for far-end network.
3. subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation according to claim 2, it is characterized in that: described matter block models comprises high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and generator, and described matter piece parameter comprises each modal damping coefficient of moment of inertia, interblock elasticity coefficient and unit.
4. subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation according to claim 1, it is characterized in that: in the described step 2, regularly from the dispatching of power netwoks operational system, obtain current network topology and flow data, and the throwing that respectively keeps element in the original time domain simulation model of described sub-synchronous oscillation moved back situation and the genset situation of exerting oneself is upgraded, form sub-synchronous oscillation current working time domain simulation model, make this sub-synchronous oscillation current working time domain simulation model meet current system conditions.
5. subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation according to claim 1, it is characterized in that: in the described step 3, on the basis of sub-synchronous oscillation current working time domain simulation model, respectively each throwing situation of moving back that keeps element is changed, and carry out permutation and combination, form the contiguous operating mode time domain simulation model of sub-synchronous oscillation, the contiguous operating mode time domain simulation model of sub-synchronous oscillation reflects the contiguous operating mode of current operating condition, and the contiguous operating mode time domain simulation model of sub-synchronous oscillation is committed to the simulation calculation platform.
6. subsynchronous oscillation of electrical power system on-line analysis and method for early warning based on time-domain-simulation according to claim 1, it is characterized in that: in the described step 4, the contiguous operating mode time domain simulation model of the sub-synchronous oscillation that is committed to the simulation calculation platform is carried out the electro-magnetic transient time-domain-simulation to be calculated, analyze simulation result, and analysis result gathered, form the sub-synchronous oscillation early warning information that this power plant sends the current operating condition of system.The sub-synchronous oscillation early warning information sends to the management and running personnel reference of electrical network, in order to avoid existing the operating mode of big sub-synchronous oscillation risk in scheduling.
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| CN103983451A (en) * | 2014-06-03 | 2014-08-13 | 贵州电力试验研究院 | On-line measuring method for subsynchronous oscillation system damping |
| CN104573318A (en) * | 2014-12-02 | 2015-04-29 | 江苏大学 | Method for identifying modeling boundary of sub-synchronous resonance actual system |
| CN105181014A (en) * | 2015-08-28 | 2015-12-23 | 中国神华能源股份有限公司 | Subsynchronous oscillation monitoring system and method |
| CN105488315A (en) * | 2014-09-16 | 2016-04-13 | 国家电网公司 | Analysis method for subsynchronous oscillation generated by grid connection of wind driven generators |
| CN110137948A (en) * | 2019-05-14 | 2019-08-16 | 中国电力科学研究院有限公司 | A kind of appraisal procedure and device of double-fed fan motor play synchronized oscillation risk |
| CN110489801A (en) * | 2019-07-19 | 2019-11-22 | 国网新疆电力有限公司电力科学研究院 | Utilize the generator shafting multiple mass parameter predigesting method of particle swarm optimization algorithm |
| CN110854884A (en) * | 2019-12-07 | 2020-02-28 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Wind power collection region subsynchronous oscillation risk online assessment and early warning method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103983451A (en) * | 2014-06-03 | 2014-08-13 | 贵州电力试验研究院 | On-line measuring method for subsynchronous oscillation system damping |
| CN105488315A (en) * | 2014-09-16 | 2016-04-13 | 国家电网公司 | Analysis method for subsynchronous oscillation generated by grid connection of wind driven generators |
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| CN105181014A (en) * | 2015-08-28 | 2015-12-23 | 中国神华能源股份有限公司 | Subsynchronous oscillation monitoring system and method |
| CN110137948A (en) * | 2019-05-14 | 2019-08-16 | 中国电力科学研究院有限公司 | A kind of appraisal procedure and device of double-fed fan motor play synchronized oscillation risk |
| CN110137948B (en) * | 2019-05-14 | 2022-04-15 | 中国电力科学研究院有限公司 | Method and device for evaluating sub-synchronous oscillation risk of doubly-fed wind power plant |
| CN110489801A (en) * | 2019-07-19 | 2019-11-22 | 国网新疆电力有限公司电力科学研究院 | Utilize the generator shafting multiple mass parameter predigesting method of particle swarm optimization algorithm |
| CN110854884A (en) * | 2019-12-07 | 2020-02-28 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Wind power collection region subsynchronous oscillation risk online assessment and early warning method |
| CN110854884B (en) * | 2019-12-07 | 2023-07-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Wind power collection area subsynchronous oscillation risk online assessment and early warning method |
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