CN102916450A - Hybrid real-time simulation method for three-phase asymmetric alternating current and direct current power system - Google Patents
Hybrid real-time simulation method for three-phase asymmetric alternating current and direct current power system Download PDFInfo
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Abstract
The invention relates to a hybrid real-time simulation method of a three-phase asymmetric alternating current and direct current power system, and belongs to the technical field of digital simulation of alternating current and direct current power systems. At an alternating current bus of a transmission converter transformer of an alternating current and direct current power system, the alternating current and direct current power system is divided into an alternating current side sub-network and a direct current side sub-network, and the alternating current side sub-network divides an interface positive sequence current, an interface negative sequence current and an interface zero sequence current at an interface of a network division interface into a positive sequence current, an interface negative sequence current and an interface zero sequence currentThe three-sequence current is used as the interface three-sequence current of a positive sequence network, a negative sequence network and a zero sequence network in electromechanical transient simulation calculation; bus voltage at interface of direct current side sub-network pair sub-networkAnd processing to obtain a three-phase voltage instantaneous value, and using the value as a bus voltage at a grid interface of the direct-current side sub-grid electromagnetic transient simulation calculation. The hybrid real-time simulation method improves the accuracy and adaptability of hybrid simulation of the AC/DC power system, highlights the physical process of interface interaction of the hybrid simulation, and is a practical method for processing interface interaction under the condition of three-phase asymmetry of an AC side subnet of the AC/DC power system.
Description
Technical field
The present invention relates to the hybrid real-time simulation method of the asymmetric AC and DC power system of a kind of three-phase, belong to AC and DC power system digital simulation technique field.
Background technology
Controller and device extensively put into operation fast for novel response in the modern power systems, particularly many times DC transmission engineering put into operation and put into operation at electrical network with many large-capacity power electronic installations, multiple transient process close-coupled typically comprises electromagnetic transient and electromechanical transient process in the electric power system.To this, electro-magnetic transient/electromechanical transient hybrid simulation technology combines unified consideration with transient processes such as electromagnetism and electromechanics, in an emulation the two is simulated simultaneously.
The situation of AC network three-phase symmetrical is only considered at present hybrid simulation technical research mostly, the existing commercialization power system simulation software that comprises the hybrid simulation function and simulator still lack the interface processing method of AC network three-phase when asymmetric in the hybrid simulation module, not yet consider still can't process asymmetrical component in electro-magnetic transient, the electromechanical transient subnet interface such as FDNE module among the RTDS of hybrid simulation module in the NETOMAC software of Siemens and Canadian RTDS technology company.
In practical power systems, the occurrence probability such as single-phase fault are much larger than the three-phase symmetrical fault, and ac and dc systems influence each other and the direct current system characteristic research in, asymmetric fault is the easier direct current system commutation failure that causes under a stable condition, and the asymmetric situation of AC system is also extremely important to the behavioral trait of direct current system.
The hybrid simulation technology has had a strong impact on accuracy and the effective application of hybrid simulation in the limitation of processing aspect the asymmetric operating mode of ac and dc systems three-phase.Therefore, be necessary to adopt Appropriate method to process under the asymmetric operating mode of AC network three-phase the interactive interfacing of asymmetry part between the hybrid simulation subnet, in order to guarantee in the hybrid simulation hybrid simulation valid interface under AC network three-phase unbalanced fault, disturbance and the operating mode.
Summary of the invention
The objective of the invention is to propose the hybrid real-time simulation method of the asymmetric AC and DC power system of a kind of three-phase, with the interactive interfacing of hybrid simulation electro-magnetic transient, electromechanical transient both sides in the asymmetric situation of effective processing AC and DC power system AC three-phase, guarantee that interface electric parameters asymmetry part can be correctly mutual in the hybrid simulation.
The hybrid real-time simulation method of the asymmetric AC and DC power system of three-phase that the present invention proposes may further comprise the steps:
(1) at the direct-current transmission converter transformer alternating bus place of AC and DC power system, AC and DC power system is divided into AC subnet and DC side subnet, DC side subnet wherein comprises DC line, converter, converter transformer, filter and DC control system, the AC subnet comprises AC system, and the direct-current transmission converter transformer alternating bus place of AC and DC power system is defined as a minute network interface;
(2) adopt the electromechanical transient simulation system that the AC subnet is carried out electromechanical transient simulation and calculate, detailed process may further comprise the steps:
(2-1) the AC subnet extracts the three-phase current instantaneous value that subnetting interface DC side subnet injects the AC subnet from the electromagnetic transient simulation result of DC side subnet;
(2-2) the AC subnet injects the three-phase current instantaneous value of AC subnet according to above-mentioned subnetting interface DC side subnet, by discrete Fourier transform, obtain the three-phase fundamental phasors that subnetting interface DC side subnet injects AC subnet electric current, and by the conversion of three-phase phasor to three order amounts, obtain the sequence currents that subnetting interface DC side subnet injects the AC subnet, comprise interface forward-order current, interface negative-sequence current and interface zero-sequence current, be designated as
(3-3) the AC subnet is with above-mentioned interface forward-order current, interface negative-sequence current and interface zero-sequence current
The interface sequence currents of positive sequence net, Negative-sequence Net and zero sequence net in calculating as electromechanical transient simulation respectively;
(3) adopt the electromagnetic transient simulation system that the DC side subnet is carried out electromagnetic transient simulation and calculate, detailed process may further comprise the steps:
(3-1) the DC side subnet extracts the AC subnet at three sequence voltages of positive sequence, negative phase-sequence and the zero sequence of subnetting interface from the electromechanical transient simulation result of AC subnet
The DC side subnet adopts the unitary current injection method, according to the parameter of node and the branch road of AC subnet, calculates the AC subnet at three order port Impedance Z of positive sequence, negative phase-sequence and the zero sequence of subnetting interface
Eq, 120
(3-2) the DC side subnet is according to three sequence voltages of positive sequence, negative phase-sequence and the zero sequence of above-mentioned subnetting interface
Three order port Impedance Z of positive sequence, negative phase-sequence and zero sequence
Eq, 120With interface forward-order current, interface negative-sequence current and interface zero-sequence current
Calculate the busbar voltage of subnetting interface
(3-3) the DC side subnet is to the busbar voltage of above-mentioned subnetting interface
Carry out three order amounts to the conversion of three phasors, obtain the three-phase fundamental phasors of subnetting interface busbar voltage, this three-phase fundamental phasors is synthesized the three-phase voltage instantaneous value of minute network interface busbar voltage, this three-phase voltage instantaneous value is as the busbar voltage of the subnetting interface of DC side subnet electromagnetic transient simulation calculating again.
The hybrid real-time simulation method of the asymmetric AC and DC power system of three-phase that the present invention proposes, its advantage is, perfect under the AC subnet three-phase asymmetric case of simulated AC and DC power system the hybrid simulation interactive interfacing to the processing of first-harmonic asymmetry part, so that the impact of DC side subnet can effectively be reflected to AC negative phase-sequence and zero sequence net in the hybrid simulation interactive interfacing, guaranteed that simultaneously subnetting interface boundary voltage has comprised complete asymmetrical information in the calculating of DC side subnet, thereby overcome conventional hybrid emulation to the AC system asymmetric fault, disturbance or operating mode are too simplified the mutual defective of Processing Interface, have improved precision and the adaptability of AC and DC power system hybrid simulation.The inventive method is easy to realize, the physical process of outstanding hybrid simulation interactive interfacing is to process the mutual practical approach of the AC and DC power system AC asymmetric situation lower interface of subnet three-phase.
Description of drawings
Fig. 1 is the asymmetric hybrid simulation interactive interface of the ac and dc systems three-phase system schematic that the inventive method relates to.
Embodiment
The hybrid real-time simulation method of the asymmetric AC and DC power system of three-phase that the present invention proposes, the system schematic that relates to as shown in Figure 1, the method may further comprise the steps:
(1) at the direct-current transmission converter transformer alternating bus place of AC and DC power system, AC and DC power system is divided into AC subnet and DC side subnet, DC side subnet wherein comprises DC line, converter, converter transformer, filter and DC control system, the AC subnet comprises AC system, and the direct-current transmission converter transformer alternating bus place of AC and DC power system is defined as a minute network interface; AC subnet and dynamo-electric side subnet are with the electric parameters information of regular time interval exchange and processing subnetting interface position, and this time interval is got 10 milliseconds in patent of the present invention;
(2) adopting the electromechanical transient simulation system that the AC subnet is carried out electromechanical transient simulation calculates, super real-time electromechanical Transient State Simulation Software (TH-STBLT) such as the exploitation of flexible AC transmitting system research institute of Tsing-Hua University, the AC subnet is decomposed into positive sequence net, Negative-sequence Net and three subnets of zero sequence net in the electromechanical transient simulation, find the solution in the three order network process at electromechanical transient simulation, offside DC side subnet is equivalent by the sequence currents source, and detailed process may further comprise the steps:
(2-1) the AC subnet extracts the three-phase current instantaneous value that subnetting interface DC side subnet injects the AC subnet from the electromagnetic transient simulation result of DC side subnet;
(2-2) the AC subnet injects the three-phase current instantaneous value of AC subnet according to above-mentioned subnetting interface DC side subnet, by discrete Fourier transform, obtain the three-phase fundamental phasors that subnetting interface DC side subnet injects AC subnet electric current, and by the conversion of three-phase phasor to three order amounts, obtain the sequence currents that subnetting interface DC side subnet injects the AC subnet, comprise interface forward-order current, interface negative-sequence current and interface zero-sequence current, be designated as
(2-3) the AC subnet is with above-mentioned interface forward-order current, interface negative-sequence current and interface zero-sequence current
The interface sequence currents of positive sequence net, Negative-sequence Net and zero sequence net in calculating as electromechanical transient simulation respectively;
After this, the AC subnet is found the solution three order net network voltage equations according to the electromechanical transient simulation conventional method, then carries out conventional electromechanical transient simulation and calculates.
(3) adopt the electromagnetic transient simulation system that the DC side subnet is carried out electromagnetic transient simulation and calculate, such as the electric power system Real Time Digital Simulator (RTDS) of Canadian RTDS technology company, detailed process may further comprise the steps:
(3-1) the DC side subnet extracts the AC subnet at three sequence voltages of positive sequence, negative phase-sequence and the zero sequence of subnetting interface from the electromechanical transient simulation result of AC subnet
The DC side subnet adopts the unitary current injection method, according to the parameter of node and the branch road of AC subnet, calculates the AC subnet at three order port Impedance Z of positive sequence, negative phase-sequence and the zero sequence of subnetting interface
Eq, 120
(3-2) the DC side subnet is according to three sequence voltages of positive sequence, negative phase-sequence and the zero sequence of above-mentioned subnetting interface
Three order port Impedance Z of positive sequence, negative phase-sequence and zero sequence
Eq, 120With interface forward-order current, interface negative-sequence current and interface zero-sequence current
Calculate the busbar voltage of subnetting interface
(3-3) the DC side subnet is to the busbar voltage of above-mentioned subnetting interface
Carry out three order amounts to the conversion of three phasors, obtain the three-phase fundamental phasors of subnetting interface busbar voltage, this three-phase fundamental phasors is synthesized the three-phase voltage instantaneous value of minute network interface busbar voltage, this three-phase voltage instantaneous value is as the busbar voltage of the subnetting interface of DC side subnet electromagnetic transient simulation calculating again.
After this, the DC side subnet carries out conventional electromagnetic transient simulation calculating.
The basic principle of the inventive method is, for high-voltage direct current in the asymmetric situation of AC three-phase, when converter transformer ac bus voltage falls and fluctuates within the specific limits, see into DC transmission system its three orders net Approximate Decoupling from two ends converter transformer ac bus.Based on this, the present invention proposes the hybrid real-time simulation method of the asymmetric AC and DC power system of three-phase: relax the emulation AC-DC based on routine and divide net mode, parallel mutual sequential, electromagnetism, electromechanical transient side system adopt respectively ideal voltage source and the current source model of taking into account interface current to side system in calculating, mutual and realize at the interface model equivalent parameters, current source model three order decoupling zeros, inject three order nets of electromechanical transient side respectively.
Claims (1)
1. the hybrid real-time simulation method of the asymmetric AC and DC power system of three-phase is characterized in that the method may further comprise the steps:
(1) at the direct-current transmission converter transformer alternating bus place of AC and DC power system, AC and DC power system is divided into AC subnet and DC side subnet, DC side subnet wherein comprises DC line, converter, converter transformer, filter and DC control system, the AC subnet comprises AC system, and the direct-current transmission converter transformer alternating bus place of AC and DC power system is defined as a minute network interface;
(2) adopt the electromechanical transient simulation system that the AC subnet is carried out electromechanical transient simulation and calculate, detailed process may further comprise the steps:
(2-1) the AC subnet extracts the three-phase current instantaneous value that subnetting interface DC side subnet injects the AC subnet from the electromagnetic transient simulation result of DC side subnet;
(2-2) the AC subnet injects the three-phase current instantaneous value of AC subnet according to above-mentioned subnetting interface DC side subnet, by discrete Fourier transform, obtain the three-phase fundamental phasors that subnetting interface DC side subnet injects AC subnet electric current, and by the conversion of three-phase phasor to three order amounts, obtain the sequence currents that subnetting interface DC side subnet injects the AC subnet, comprise interface forward-order current, interface negative-sequence current and interface zero-sequence current, be designated as
(3-3) the AC subnet is with above-mentioned interface forward-order current, interface negative-sequence current and interface zero-sequence current
The interface sequence currents of positive sequence net, Negative-sequence Net and zero sequence net in calculating as electromechanical transient simulation respectively;
(3) adopt the electromagnetic transient simulation system that the DC side subnet is carried out electromagnetic transient simulation and calculate, detailed process may further comprise the steps:
(3-1) the DC side subnet extracts the AC subnet at three sequence voltages of positive sequence, negative phase-sequence and the zero sequence of subnetting interface from the electromechanical transient simulation result of AC subnet
The DC side subnet adopts the unitary current injection method, according to the parameter of node and the branch road of AC subnet, calculates the AC subnet at three order port Impedance Z of positive sequence, negative phase-sequence and the zero sequence of subnetting interface
Eq, 120
(3-2) the DC side subnet is according to three sequence voltages of positive sequence, negative phase-sequence and the zero sequence of above-mentioned subnetting interface
Three order port Impedance Z of positive sequence, negative phase-sequence and zero sequence
Eq, 120With interface forward-order current, interface negative-sequence current and interface zero-sequence current
Calculate the busbar voltage of subnetting interface
(3-3) the DC side subnet is to the busbar voltage of above-mentioned subnetting interface
Carry out three order amounts to the conversion of three phasors, obtain the three-phase fundamental phasors of subnetting interface busbar voltage, this three-phase fundamental phasors is synthesized the three-phase voltage instantaneous value of minute network interface busbar voltage, this three-phase voltage instantaneous value is as the busbar voltage of the subnetting interface of DC side subnet electromagnetic transient simulation calculating again.
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Cited By (12)
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| CN103761351A (en) * | 2013-10-09 | 2014-04-30 | 广西电网公司 | Method for modeling and simulating transient stability of asymmetrical power system |
| CN105262121A (en) * | 2015-09-30 | 2016-01-20 | 南方电网科学研究院有限责任公司 | Negative sequence current control method and system under unbalanced state of flexible direct current transmission system |
| CN105914773A (en) * | 2016-05-16 | 2016-08-31 | 浙江大学 | Method for determining AC side power limit of current converter under asymmetrical alternating voltage |
| CN106549377A (en) * | 2016-12-09 | 2017-03-29 | 西安交通大学 | A kind of handover method of alternating current-direct current combined hybrid system electromechanics electromagnetic transient hybrid simulation |
| CN106777827A (en) * | 2017-01-24 | 2017-05-31 | 中国电力科学研究院 | A kind of electromechanical electromagnetism hybrid simulation method and system |
| CN106886616A (en) * | 2015-12-15 | 2017-06-23 | 中国电力科学研究院 | A kind of automatic subnetting method of extensive electro-magnetic transient grid simulation |
| CN109521690A (en) * | 2018-10-16 | 2019-03-26 | 武汉职业技术学院 | A kind of interface data transmission method for combining Real Time Hybrid Simulation with RTLAB based on RTDS |
| CN112163315A (en) * | 2020-08-28 | 2021-01-01 | 国网天津市电力公司电力科学研究院 | Electromechanical-electromagnetic transient simulation method for AC/DC hybrid power grid |
| CN112307699A (en) * | 2020-11-20 | 2021-02-02 | 中国南方电网有限责任公司 | VSC-HVDC electromechanical transient simulation method and system based on phase component |
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| CN113609638A (en) * | 2021-06-24 | 2021-11-05 | 广东电网有限责任公司 | Electromechanical-electromagnetic hybrid fault prediction method and system of energy storage transient model |
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| CN103761351B (en) * | 2013-10-09 | 2017-01-04 | 广西电网公司 | A kind of modeling and simulation method of asymmetric electric power system transient stability |
| CN103761351A (en) * | 2013-10-09 | 2014-04-30 | 广西电网公司 | Method for modeling and simulating transient stability of asymmetrical power system |
| CN105262121A (en) * | 2015-09-30 | 2016-01-20 | 南方电网科学研究院有限责任公司 | Negative sequence current control method and system under unbalanced state of flexible direct current transmission system |
| CN106886616A (en) * | 2015-12-15 | 2017-06-23 | 中国电力科学研究院 | A kind of automatic subnetting method of extensive electro-magnetic transient grid simulation |
| CN106886616B (en) * | 2015-12-15 | 2020-06-16 | 中国电力科学研究院 | Automatic network division method for large-scale electromagnetic transient power grid simulation |
| CN105914773A (en) * | 2016-05-16 | 2016-08-31 | 浙江大学 | Method for determining AC side power limit of current converter under asymmetrical alternating voltage |
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| CN106549377A (en) * | 2016-12-09 | 2017-03-29 | 西安交通大学 | A kind of handover method of alternating current-direct current combined hybrid system electromechanics electromagnetic transient hybrid simulation |
| CN106777827A (en) * | 2017-01-24 | 2017-05-31 | 中国电力科学研究院 | A kind of electromechanical electromagnetism hybrid simulation method and system |
| CN106777827B (en) * | 2017-01-24 | 2023-08-15 | 中国电力科学研究院 | Electromechanical-electromagnetic hybrid simulation method and system |
| CN109521690A (en) * | 2018-10-16 | 2019-03-26 | 武汉职业技术学院 | A kind of interface data transmission method for combining Real Time Hybrid Simulation with RTLAB based on RTDS |
| CN112163315A (en) * | 2020-08-28 | 2021-01-01 | 国网天津市电力公司电力科学研究院 | Electromechanical-electromagnetic transient simulation method for AC/DC hybrid power grid |
| CN112163315B (en) * | 2020-08-28 | 2023-03-28 | 国网天津市电力公司电力科学研究院 | Electromechanical-electromagnetic transient simulation method for AC/DC hybrid power grid |
| CN112307699A (en) * | 2020-11-20 | 2021-02-02 | 中国南方电网有限责任公司 | VSC-HVDC electromechanical transient simulation method and system based on phase component |
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| CN113110099A (en) * | 2021-03-04 | 2021-07-13 | 清华大学 | Multi-mode integrated hybrid real-time simulation platform |
| CN113110099B (en) * | 2021-03-04 | 2023-03-14 | 清华大学 | Multi-mode integrated mixed real-time simulation platform |
| CN113609638A (en) * | 2021-06-24 | 2021-11-05 | 广东电网有限责任公司 | Electromechanical-electromagnetic hybrid fault prediction method and system of energy storage transient model |
| CN113609638B (en) * | 2021-06-24 | 2024-09-24 | 广东电网有限责任公司 | Electromechanical-electromagnetic hybrid fault prediction method and system for energy storage transient model |
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Application publication date: 20130206 |