CN113541189B - Interface positioning method for electromechanical-electromagnetic transient hybrid simulation - Google Patents
Interface positioning method for electromechanical-electromagnetic transient hybrid simulation Download PDFInfo
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- 238000004088 simulation Methods 0.000 title claims abstract description 39
- 230000001052 transient effect Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010586 diagram Methods 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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]
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides an interface positioning method suitable for electromechanical-electromagnetic transient hybrid simulation of a large-scale AC/DC power grid, which comprises the following steps: s1, determining an interface bus range based on a reactive power injection method; s2, carrying out frequency-blocking characteristic scanning on all buses in the interface bus range determined in the S1 and drawing a frequency-blocking characteristic diagram; s3, analyzing the frequency resistance characteristic diagram of each step of bus obtained in the S2, and determining an interface bus. The interface positioning method suitable for the electromechanical-electromagnetic transient hybrid simulation of the large-scale AC/DC power grid solves the problem that the electromechanical-electromagnetic transient hybrid simulation interface positioning of the current large-scale AC/DC power grid cannot be quantitatively described or only takes a converter bus as an interface, so that the simulation is inaccurate.
Description
Technical Field
The invention relates to the field of power system simulation, in particular to an interface positioning method suitable for electromechanical-electromagnetic transient hybrid simulation of a large-scale AC/DC power grid.
Background
With more and more high-voltage direct current transmission systems, flexible direct current transmission systems, wind power, photovoltaic and other renewable energy sources accessing into a power grid, a modern power grid becomes a large-scale alternating current/direct current interconnection power grid.
Simulation analysis is an important means for planning and running the power system. The traditional digital simulation of the power system can be divided into electromechanical transient simulation and electromagnetic transient simulation. The electromechanical transient simulation step length is usually in the millisecond level, the calculation speed is high, the calculation scale can reach tens of thousands of nodes, but the electromechanical transient simulation step length is difficult to accurately simulate a power electronic device with rapid response; the electromagnetic transient simulation step length is microsecond level, the detailed modeling can be performed on a large-scale power electronic device, the calculation modeling is complex, the calculated amount is large, the scale is limited, in the pure electromagnetic transient simulation process, the Thevenin model consisting of a voltage source and an impedance is usually used for the alternating current part of a large system to be equivalent, but the model cannot reflect the dynamic characteristics of elements such as a generator, a speed regulator and the like, and certain difference is unavoidable between the model and a real system, so that the simulation modeling accuracy is low. The electromechanical-electromagnetic transient hybrid simulation combines the electromechanical transient simulation and the electromagnetic transient simulation, not only can accurately simulate the equipment connected with the grid through a large-scale power electronic device, but also can consider the integral transient characteristic of a large-scale alternating current power grid where the equipment is positioned, and becomes an important tool for researching the operation mechanism and the characteristic of the large-scale alternating current/direct current power grid.
The electromechanical-electromagnetic transient hybrid simulation technology self-proposes that the positioning of an electromechanical transient interface and an electromagnetic transient interface is always a hot spot and a difficult problem of hybrid simulation research, the balance needs to be carried out before the accuracy and complexity of simulation realization, an alternating-direct sub-network (taking a converter bus of a converter as an interface position) and an alternating-direct sub-network (taking the converter bus of the converter continuously extends to a certain distance to an alternating side as an interface position) are commonly adopted at present, the alternating-direct sub-network is relatively simple, but cannot accurately reflect the harmonic influence of the periphery of the converter bus, the simulation accuracy is not high, the alternating-direct sub-network is relatively complex, the harmonic influence of the converter bus can be considered to a certain extent, the interface position is difficult to select, and the method for determining the position of the electromechanical-electromagnetic hybrid simulation interface based on the reactive power injection and frequency blocking characteristic is not provided.
Disclosure of Invention
The invention aims to provide an interface positioning method suitable for electromechanical-electromagnetic transient hybrid simulation of a large-scale AC/DC power grid, which is used for solving the problem that the electromechanical-electromagnetic transient hybrid simulation interface positioning of the current large-scale AC/DC power grid cannot be quantitatively described or only takes a converter bus as an interface, so that simulation is inaccurate.
In order to achieve the above purpose, the invention provides an interface positioning method suitable for electromechanical-electromagnetic transient hybrid simulation of a large-scale ac/dc power grid, which is based on an electromagnetic transient simulation software RTDS and an electromechanical transient simulation software PSS/E commonly used internationally, and uses the existing RTDS GTFPGA as an interface of the two simulation software to construct an electromechanical-electromagnetic hybrid simulation platform of the large-scale ac/dc power grid, and based on the platform, an interface positioning study of the electromechanical-electromagnetic transient hybrid simulation of the large-scale ac/dc power grid is developed, and comprises the following steps: s1, determining an interface bus range based on a reactive power injection method; s2, carrying out frequency-blocking characteristic scanning on each step bus in a range determined by a reactive power injection method and drawing a frequency-blocking characteristic diagram; s3, analyzing the frequency resistance characteristic diagram of each step of bus obtained in the S2, and determining an interface bus.
In the step S1, the method further includes the following steps: s11, injecting quantitative reactive power Q at a converter bus of the converter inj The method comprises the steps of carrying out a first treatment on the surface of the S12, calculating the voltage deviation delta U of each order bus of 1-n orders around the converter bus, wherein the converter bus is 0 order, and the voltage of the 0 order bus is U 0 The bus directly connected with the converter bus is a 1 st-order bus, and the voltage of the 1 st-order bus is U 1 The voltage deviation of the 1 st order bus is DeltaU 1 ＝U 1 -U 0 The method comprises the steps of carrying out a first treatment on the surface of the The bus directly connected with the 1 st-order bus is 2 nd order, and the voltage of the 2 nd order bus is U 2 The voltage deviation of the 2 nd order bus is DeltaU 2 ＝U 2 -U 1 The method comprises the steps of carrying out a first treatment on the surface of the And so on, the voltage deviation of the i-order bus is delta U i ＝U i -U i-1 Until the voltage deviation of the n-order bus is calculated to be delta U n ＝U n -U n-1 ；
S13, calculating and comparing the reactive power and the voltage change rate of each step of bus, and determining the interface bus range.
In the step S13, the method further includes the following steps: s131, calculating the reactive power and the voltage change rate of each order bus of 1-n orders, namely
Wherein Q is inj Representing the reactive power, deltaU, injected at the converter bus of the converter in said step S11 i Representing the voltage deviation, k, of the i-stage bus obtained in the step S12 i The reactive power and the voltage change rate of the i-order bus are represented;
s132, comparing the change rate of each order bus of 1-n orders to determine the interface bus range;
comparing the reactive power of each busbar of each step obtained in the step S131 with the voltage change rate k i When the change of the reactive power and the voltage change rate k of the j-th and j+1-th buses is not obvious, namelyWhen the minimum j meeting the above condition is taken min Step bus and conditional maximum j max The step bus bars are respectively used as two ends of the range of the interface bus bar, namely j min ～j max The step bus is a determined interface bus range.
In the step S2, the method further includes the following steps: at each level of bus within the range determined in step S1, i.e. all j min ～j max At each step bus, respectively injecting harmonic sources with increasing frequencies, and measuring the impedance of the system under different frequencies after stable operation;
s22, drawing j according to the impedance of each step bus obtained in the step S21 at different frequencies min ～j max And a frequency resistance characteristic diagram of each step of bus.
In the step S3, the specific analysis is as follows, for j min ～j max Comparing and analyzing the frequency resistance characteristic diagrams of the buses of each step, and taking the bus with the smallest order, in which the frequency resistance characteristic is not changed greatly, as an interface bus; when j is min ～j max When the overlap ratio of the m-th order bus and the m+1-th order bus is more than 85%, the m-th order bus with the smallest order is taken as an interface bus, wherein m is [ j ] min ，j max ]Integers within the range.
In summary, the invention provides an interface positioning method suitable for electromechanical-electromagnetic transient hybrid simulation of a large-scale AC/DC power grid, which solves a series of problems that the electromechanical-electromagnetic hybrid simulation interface position of the current large-scale AC/DC power grid cannot be quantitatively described or determined inaccurately, simulation results are inaccurate possibly, so that inaccurate safety and stability analysis and improper safety strategy formulation are caused. The steps of the present invention will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a specific flow diagram of an interface positioning method suitable for electromechanical-electromagnetic transient hybrid simulation of a large-scale ac/dc power grid.
Detailed Description
The invention constructs an electromechanical-electromagnetic hybrid simulation platform of a large-scale alternating current-direct current interconnection power grid based on an electromagnetic transient simulation software RTDS and an electromechanical transient simulation software PSS/E which are commonly used internationally, and uses the existing RTDS GTFPGA as an interface of the RTDS and the PSS/E, and provides an interface positioning method suitable for the electromechanical-electromagnetic transient hybrid simulation platform of the large-scale alternating current-direct current power grid, which comprises the following specific steps:
s1, determining an interface bus range based on a reactive power injection method;
s11, injecting quantitative reactive power Q at a converter bus of the converter inj ；
S12, calculating the voltage deviation delta U of each order bus of 1-n orders around the converter bus;
the converter bus is used as a 0-order bus, and the voltage of the 0-order bus is U 0 The bus directly connected with the converter bus is a 1 st-order bus, and the voltage of the 1 st-order bus is U 1 The voltage deviation of the 1 st order bus is DeltaU 1 ＝U 1 -U 0 The method comprises the steps of carrying out a first treatment on the surface of the The bus directly connected with the 1 st order bus is a 2 nd order bus, and the voltage of the 2 nd order bus is U 2 The voltage deviation of the 2 nd order bus is DeltaU 2 ＝U 2 -U 1 ；
And so on, the voltage deviation of the i-order bus is delta U i ＝U i -U i-1 Until the voltage deviation of the n-order bus is calculated to be delta U n ＝U n -U n-1 ；
S13, calculating and comparing the reactive power and the voltage change rate of each step of bus, and determining the interface bus range;
s131, calculating the reactive power and the voltage change rate of each order bus of 1-n steps, namely:
wherein Q is inj Representing reactive power injected at a converter bus of a converter, deltaU i Represents the voltage deviation of the i-order bus, k i The reactive power and the voltage change rate of the i-order bus are represented;
s132, comparing the reactive power and the voltage change rate of each order bus of 1-n orders to determine the interface bus range;
comparing the reactive power of each busbar of each step obtained in step S131 with the voltage change rate k i When the change of the reactive power and the voltage change rate of the j-th and the j+1-th buses is not obvious, namelyWhen the minimum j meeting the above condition is taken min Step bus and conditional maximum j max The step buses are respectively used as two ends of the range of the interface bus, namelyj min ～j max The step bus is a determined interface bus range.
S2, carrying out frequency-blocking characteristic scanning on all buses in a range determined by a reactive power injection method and drawing a frequency-blocking characteristic diagram;
s21, in the interface bus range determined in the step S1, namely all j min ～j max At each step of bus, respectively injecting harmonic sources with increasing frequency, and after stable operation, measuring impedance of the simulation platform at different frequencies by using a frequency resistance response model in electromagnetic transient simulation software;
s22, drawing j by using electromagnetic transient simulation software according to the impedance of each busbar of each step obtained in the step S21 under different frequencies min ～j max And a frequency resistance characteristic diagram of each step of bus.
S3, analyzing j min ～j max Determining interface buses according to the frequency resistance characteristic diagrams of the buses of each step;
for j obtained in step S2 min ～j max Comparing and analyzing the frequency-blocking characteristic diagrams of the buses of each step, and taking the bus with the smallest order with the small frequency-blocking characteristic variation as an interface bus, namely when j min ～j max When the overlap ratio of the m-th order bus in the order buses and the frequency resistance characteristic curve of the m+1th order bus is more than 85%, taking the m-th order bus with the smallest order as an interface bus, wherein m is [ j ] min ，j max ]Integers within the range.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (2)
1. An interface positioning method suitable for electromechanical-electromagnetic transient hybrid simulation of a large-scale AC/DC power grid is characterized by comprising the following steps:
s1, determining an interface bus range based on a reactive power injection method;
s2, carrying out frequency-blocking characteristic scanning on each step bus within the interface bus range determined in the S1 and drawing a frequency-blocking characteristic diagram;
s3, analyzing the frequency resistance characteristic diagram of each step of bus obtained in the S2, and determining an interface bus;
wherein, in the step S1, the method further comprises the following steps:
s11, injecting quantitative reactive power Q into a converter bus of the converter inj ；
S12, calculating the voltage deviation delta U of each order bus of 1-n orders around the converter bus;
the 0-order bus voltage is U when the converter bus is 0-order 0 The bus directly connected with the converter bus is a 1-order bus, and the 1-order bus voltage is U 1 The voltage deviation of the 1 st order bus is DeltaU 1 ＝U 1 -U 0 The bus directly connected with the 1 st-order bus is 2 nd order, and the voltage of the 2 nd order bus is U 2 The voltage deviation of the 2 nd order bus is DeltaU 2 ＝U 2 -U 1 And so on, the voltage deviation of the i-order bus is delta U i ＝U i -U i-1 Until the voltage deviation of the n-order bus is calculated to be delta U n ＝U n -U n-1 ；
S13, calculating and comparing the reactive power and the voltage change rate of each step of bus, and determining the interface bus range;
wherein, in the step S13, the method further comprises the following steps:
s131, calculating the reactive power and the voltage change rate of each order bus of 1-n orders, namelyWherein Q is inj Representing the reactive power, deltaU, injected at the converter bus of the converter in said step S11 i Representing the voltage deviation, k, of the i-stage bus obtained in the step S12 i The reactive power and the voltage change rate of the i-order bus are represented;
S132、comparing the reactive power and the voltage change rate of each busbar of the steps obtained in the step S131, when the change of the reactive power and the voltage change rate at the jth and the (j+1) th busbars is not obvious, namelyWhen the minimum j meeting the condition is obtained min Step bus and maximum j meeting the condition max The step bus is respectively used as two ends of the interface bus range, namely j min ～j max The step bus is a determined interface bus range;
wherein, in the step S2, the method further comprises the following steps:
s21, at each step bus within the interface bus range determined in the step S1, namely all j min ～j max At each step bus, respectively injecting harmonic sources with increasing frequencies, and measuring the impedance of the system under different frequencies after stable operation;
s22, drawing according to the impedance of each step bus obtained in the step S21 at different frequencies
j min ～j max Frequency resistance characteristic diagrams of all the steps of buses;
the specific analysis of the step S3 is as follows: for j obtained in the step S22 min ～j max And comparing and analyzing the frequency resistance characteristic diagrams of the buses of each step, and taking the bus with the smallest order in the adjacent two-step buses as an interface bus when more than 85% of the frequency resistance characteristic curves between the adjacent two-step buses are overlapped.
2. The interface positioning method for electromechanical-electromagnetic transient hybrid simulation of large-scale ac/dc power grid according to claim 1, wherein in step S3, at j min ～j max In each step of buses, when the overlap ratio of the frequency resistance characteristic curve of the mth step bus and the (m+1) th step bus is more than 85%, the smallest m step bus is taken as an interface bus, wherein m is [ j ] min ，j max ]Integers within the range.
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