CN111987727A - Simulation verification method based on terminal power grid coordination peak shaving strategy - Google Patents
Simulation verification method based on terminal power grid coordination peak shaving strategy Download PDFInfo
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- CN111987727A CN111987727A CN202010751862.3A CN202010751862A CN111987727A CN 111987727 A CN111987727 A CN 111987727A CN 202010751862 A CN202010751862 A CN 202010751862A CN 111987727 A CN111987727 A CN 111987727A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004088 simulation Methods 0.000 title claims abstract description 27
- 238000012795 verification Methods 0.000 title claims abstract description 15
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a simulation verification method based on a terminal power grid coordination peak regulation strategy, which is characterized by comprising the following steps of: s1: setting initial value P of receiving end system loadLD0And a step of change Δ PLDAnd the waveform amplitude and period T of the fluctuating power superimposed on the loadLDAnd S2: calculating initial steady state load flow according to the initial value of the receiving end system load to obtain the transmission power value P on the connecting lineL0The beneficial effect of the invention is that the verification of the steps of the invention shows that: the larger the amplitude of the power fluctuation on the contact line is, the larger the influence degree of the power fluctuation on the transmission capability of the contact line is; the transmission capacity of the 750kV alternating-current connecting line can be reduced along with the power fluctuation, the transmission capacity reduction value is related to the period, the amplitude and the form of the power fluctuation, and generally speaking, the phenomenon of power fluctuation and peak burrs on the connecting line caused by the access of high-proportion renewable energy sources can cause the transmission efficiency of the connecting line to be reduced compared with the transmission efficiency of the connecting line only containing a conventional power unit system.
Description
Technical Field
The invention relates to a simulation verification method, in particular to a simulation verification method based on a terminal power grid coordination peak shaving strategy, and belongs to the technical field of electrical engineering.
Background
The transmission capacity of an alternating-current transmission system is the maximum transmission power which can be achieved by a transmission line at a certain distance on the premise of keeping an economical and reasonable system stability margin, and the transmission capacity of a power grid is limited by thermal stability, transient stability, dynamic stability, static stability and the like.
In the analysis of an electric power system, the transient stability power limit of a tie line in a region is generally calculated by adopting a time domain simulation method, the time domain simulation method approaches to a stability limit through repeated simulation, and the method adopts an accurate mathematical model of each element, so that the influence of various regulators (such as an excitation regulator, a speed regulator and the like) on the transient stability of the system can be conveniently calculated, and the method has higher precision and better numerical stability.
Analysis shows that power fluctuation on a connecting line can be decomposed into high-frequency components and low-frequency components, the fluctuation period of the high-frequency components is basically unchanged and is represented as the oscillation period of an oscillation mode between interconnected system areas, the oscillation amplitude is small and is related to the damping intensity of the oscillation mode, the fluctuation period of the low-frequency components is generally 80-200 s, the fluctuation amplitude is randomly changed and is generally 300-500 MW.
Disclosure of Invention
The invention aims to provide a simulation verification method based on a terminal power grid coordination peak shaving strategy to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a simulation verification method based on a terminal power grid coordination peak shaving strategy comprises the following steps:
s1: setting initial value P of receiving end system loadLD0And a step of change Δ PLDAnd the waveform amplitude and period T of the fluctuating power superimposed on the loadLD；
S2: calculating initial steady state load flow according to the initial value of the receiving end system load to obtain the transmission power value P on the connecting lineL0；
S3: calculating according to the period and the amplitude of the power fluctuation waveform to obtain a load power waveform of the receiving end system;
s4: gradually changing the load power value of the receiving end system according to the simulation step length and the load power waveform and carrying out continuous simulation;
s5: a fault occurs when the load value increases to a peak value;
s6: continuously changing the load value until the end of a fluctuation period, and increasing the initial value of the load of the receiving end system by delta P if the system can be kept stable all the time during the periodLDAs a new initial value, proceed to S2; otherwise, the transmission power value P calculated in the previous round S2L0I.e. the maximum power value P that can be stably transmitted for the tie in consideration of the power fluctuation of this type of tieLmaxTherefore, by changing the waveform (such as sine or triangle), amplitude and period of the fluctuating power superimposed on the receiving end load, different P will be obtainedLmax。
As a preferred technical scheme of the invention, the maximum power value P which can be stably transmitted by the tie line of the equivalent system can be obtained by adopting the calculation process of the methodLmaxWherein: the amplitude of the tie line power fluctuation is equal to the difference between the maximum value of the tie line power and the steady-state value in the simulation process,Pdue to the power wave Δ PLThe drop in the maximum transmission capacity of the tie caused by the action,Pthe ratio of the maximum transmission capacity reduction value of the tie line to the power fluctuation amplitude value is as follows:
compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a simulation verification method based on a terminal power grid coordination peak shaving strategy, which can be verified through the steps of the invention: the larger the amplitude of the power fluctuation on the contact line is, the larger the influence degree of the power fluctuation on the transmission capability of the contact line is; the transmission capacity of the 750kV alternating-current connecting line can be reduced along with the power fluctuation, the transmission capacity reduction value is related to the period, the amplitude and the form of the power fluctuation, and generally speaking, the phenomenon of power fluctuation and peak burrs on the connecting line caused by the access of high-proportion renewable energy sources can cause the transmission efficiency of the connecting line to be reduced compared with the transmission efficiency of the connecting line only containing a conventional power unit system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme of a simulation verification method based on a terminal power grid coordination peak regulation strategy, which comprises the following steps: the method comprises the following steps:
s1: setting initial value P of receiving end system loadLD0And a step of change Δ PLDAnd the waveform amplitude and period T of the fluctuating power superimposed on the loadLD；
S2: calculating initial steady state load flow according to the initial value of the receiving end system load to obtain the transmission power value P on the connecting lineL0；
S3: calculating according to the period and the amplitude of the power fluctuation waveform to obtain a load power waveform of the receiving end system;
s4: gradually changing the load power value of the receiving end system according to the simulation step length and the load power waveform and carrying out continuous simulation;
s5: a fault occurs when the load value increases to a peak value;
s6: continuously changing the load value until the end of a fluctuation period, and increasing the initial value of the load of the receiving end system by delta P if the system can be kept stable all the time during the periodLDAs a new initial value, proceed to S2; otherwise, the transmission power value P calculated in the previous round S2L0I.e. the maximum power value P that can be stably transmitted for the tie in consideration of the power fluctuation of this type of tieLmaxTherefore, by changing the waveform (such as sine or triangle), amplitude and period of the fluctuating power superimposed on the receiving end load, different P will be obtainedLmax。
The maximum power value P which can be stably transmitted by the tie line of the equivalent system can be obtained by adopting the calculation process of the methodLmaxWherein: the amplitude of the tie line power fluctuation is equal to the difference between the maximum value of the tie line power and the steady-state value in the simulation process,Pdue to the power wave Δ PLThe drop in the maximum transmission capacity of the tie caused by the action,Pthe ratio of the maximum transmission capacity reduction value of the tie line to the power fluctuation amplitude value is as follows:
when the simulation verification method is used specifically, the simulation verification method based on the terminal power grid coordination peak shaving strategy firstly sets the initial value P of the load of the receiving terminal systemLD0And a step of change Δ PLDAnd the waveform amplitude and period T of the fluctuating power superimposed on the loadLD(ii) a Then, the initial steady state load flow is calculated according to the initial value of the receiving end system load, and the transmission power value P on the connecting line is obtainedL0(ii) a Calculating according to the period and amplitude of the power fluctuation waveform to obtain a load power waveform of the receiving end system; gradually changing the load power value of the receiving end system according to the simulation step length and the load power waveform and carrying out continuous simulation; a fault occurs when the load value increases to a peak value; continuously changing the load value until the end of a fluctuation period, and increasing the initial value of the load of the receiving end system by delta P if the system can be kept stable all the time during the periodLDAs a new initial value, proceed to S2; otherwise, the transmission power value P calculated in the previous round S2L0I.e. the maximum power value P that can be stably transmitted for the tie in consideration of the power fluctuation of this type of tieLmaxTherefore, by changing the waveform (such as sine or triangle), amplitude and period of the fluctuating power superimposed on the receiving end load, different P will be obtainedLmaxFrom the above, it can be seen that: under the load power fluctuation with the same amplitude, along with the increase of the load fluctuation period, the fluctuation amplitude and the maximum transmission capability reduction value of the tie line are increased, and the percentage value of the maximum transmission capability reduction value of the tie line in the power fluctuation amplitude is also larger; in the load power fluctuation of the same period, along with the increase of the load fluctuation amplitude, the fluctuation amplitude and the maximum transmission capability reduction value of the tie line both increase, and the percentage value of the maximum transmission capability reduction value of the tie line to the power fluctuation amplitude is also larger, to sum up, the verification by the above steps of the present invention shows that: the larger the amplitude of the power fluctuation on the contact line is, the larger the influence degree of the power fluctuation on the transmission capability of the contact line is; the transmission capacity of the 750kV alternating current connecting line can be reduced along with the power fluctuation, the transmission capacity reduction value is related to the period, the amplitude and the form of the power fluctuation, and the whole isIn other words, the power fluctuation and the "spike glitch" phenomenon on the tie line caused by the access of the high-proportion renewable energy will cause the reduction of the transmission efficiency of the tie line compared with the transmission efficiency of the tie line only containing the conventional power unit system.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A simulation verification method based on a terminal power grid coordination peak shaving strategy is characterized by comprising the following steps:
s1: setting initial value P of receiving end system loadLD0And a step of change Δ PLDAnd the waveform amplitude and period T of the fluctuating power superimposed on the loadLD；
S2: calculating initial steady state load flow according to the initial value of the receiving end system load to obtain the transmission power value P on the connecting lineL0；
S3: calculating according to the period and the amplitude of the power fluctuation waveform to obtain a load power waveform of the receiving end system;
s4: gradually changing the load power value of the receiving end system according to the simulation step length and the load power waveform and carrying out continuous simulation;
s5: a fault occurs when the load value increases to a peak value;
s6: continuously changing the load value until the end of a fluctuation period, and increasing the initial value of the load of the receiving end system by delta P if the system can be kept stable all the time during the periodLDAs a new initial value, proceed to S2; otherwise, the transmission power value P calculated in the previous round S2L0I.e. the maximum power value P that can be stably transmitted for the tie in consideration of the power fluctuation of this type of tieLmaxTherefore, by changing the waveform (such as sine or triangle), amplitude and period of the fluctuating power superimposed on the receiving end load, different P will be obtainedLmax。
2. The simulation verification method based on the end-network coordination peak shaving strategy as claimed in claim 1, wherein the maximum power value P that the equivalent system tie line can stably transmit can be obtained by adopting the calculation process of the methodLmaxWherein: the amplitude of the tie line power fluctuation is equal to the difference between the maximum value of the tie line power and the steady-state value in the simulation process,Pdue to the power wave Δ PLThe drop in the maximum transmission capacity of the tie caused by the action,Pthe ratio of the maximum transmission capacity reduction value of the tie line to the power fluctuation amplitude value is as follows:
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103093398A (en) * | 2013-02-28 | 2013-05-08 | 武汉大学 | Call wire random power fluctuation calculating method based on load fluctuation characteristic |
| US20140324369A1 (en) * | 2011-12-01 | 2014-10-30 | State Grid Corporation Of China | Method for determining position of forced power oscillation disturbance source in regional interconnected power grid |
| CN105356502A (en) * | 2015-11-06 | 2016-02-24 | 中国电力科学研究院 | Contact line steady-state limit determination method suitable for wind power utilization |
| CN105515016A (en) * | 2015-12-08 | 2016-04-20 | 中国电力科学研究院 | Simulation verification method for low frequency oscillation controller |
-
2020
- 2020-07-30 CN CN202010751862.3A patent/CN111987727A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140324369A1 (en) * | 2011-12-01 | 2014-10-30 | State Grid Corporation Of China | Method for determining position of forced power oscillation disturbance source in regional interconnected power grid |
| CN103093398A (en) * | 2013-02-28 | 2013-05-08 | 武汉大学 | Call wire random power fluctuation calculating method based on load fluctuation characteristic |
| CN105356502A (en) * | 2015-11-06 | 2016-02-24 | 中国电力科学研究院 | Contact line steady-state limit determination method suitable for wind power utilization |
| CN105515016A (en) * | 2015-12-08 | 2016-04-20 | 中国电力科学研究院 | Simulation verification method for low frequency oscillation controller |
Non-Patent Citations (1)
| Title |
|---|
| 于鹏 等: "联络线随机功率波动对其输电能力影响的分析方法", 《电力系统自动化》, vol. 38, no. 02, pages 33 - 38 * |
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Application publication date: 20201124 |