CN107609802A - A kind of alternating current-direct current series-parallel connection Power Systems/voltage stability margin appraisal procedure containing multi-infeed HVDC - Google Patents
A kind of alternating current-direct current series-parallel connection Power Systems/voltage stability margin appraisal procedure containing multi-infeed HVDC Download PDFInfo
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Abstract
The present invention relates to a kind of Power Systems/voltage stability margin evaluation method, there is provided a kind of alternating current-direct current series-parallel connection Power Systems containing multi-infeed HVDC/voltage stability margin online evaluation method, including：By the determination of the equivalent equivalent way, Power Systems/voltage stability margin index PVSI computational methods, Power Systems/voltage stability boundary for simple power network of complex electric network.The invention has the advantages that：1. being simple power network by the complex electric network equivalence containing Various Components, provided conveniently for all kinds of Power System Analysis and control technology；2. weighing the power/voltage stability margin of power system under current intelligence online using power/voltage stability margin index, the weak node in network is identified；3. rate/voltage stability margin desired value and power/voltage stability boundaris are contrasted, judge whether power system stablizes, guidance can be provided for On-line Control.
Description
Technical field
The present invention relates to a kind of Power Systems/voltage stability margin evaluation method, more particularly, to one kind containing more feedbacks
Enter alternating current-direct current series-parallel connection Power Systems/voltage stability margin evaluation method of direct current.
Background technology
At present, the power/voltage stability assessment method of alternating current-direct current series-parallel connection power system can be divided into based on short circuit by its principle
The method of ratio and two kinds of the method based on sensitivity.
Based on the method for short-circuit ratio by calculating short-circuit ratio at alternating current-direct current point of common coupling and effective short-circuit ratio, and according to
Reciprocal effect degree between the structure of system and the different direct currents of running status measurement, synthesis obtain more feed-in short-circuit ratioes, more feed-ins
Effective short-circuit ratio, critical effectively short-circuit ratio etc. the index of more feed-ins；Based on the method for sensitivity by row write system depression of order it is refined can
Than matrix or extension Jacobian matrix, the determinant of further calculating matrix or characteristic value etc., the stable case of system is judged.No
By being that short-circuit ratio method or Sensitivity Method all have a variety of deficiencies, such as Sensitivity Method can only use under steady state conditions, it is impossible to
Online to system Real-Time Evaluation, and short-circuit ratio method is mainly used in qualitatively judging, it is impossible to the accurate stability boundaris for determining system,
It is not easily applied to transient state situation.In the large-scale power system of reality, both approaches are also in more difficult comprehensive consideration system
Various complex components.
The content of the invention
The present invention mainly solves the technical problem present in prior art；It is straight to provide a kind of friendship containing multi-infeed HVDC
Flow series-parallel connection Power Systems/voltage stability margin online evaluation method, it can be estimated that the alternating current-direct current series-parallel connection containing multi-infeed HVDC
The power/voltage stability margin of power system.
Further object of the present invention is that solve the technical problem present in prior art；Provide a kind of based on measuring value
Alternating current-direct current series-parallel connection Power Systems/voltage stability margin online evaluation index, the system operation shape that can be obtained according to measurement
State, the accurate stability boundaris for determining system.
It is to solve the technical problem present in prior art that the present invention has a purpose again；Providing one kind being capable of application on site
Alternating current-direct current series-parallel connection Power Systems/voltage stability margin online evaluation index, can be in the dynamic process of Operation of Electric Systems
In clear and definite system weakness zone, provide guidance for its dynamic control.
It is to solve the technical problem present in prior art that the present invention has a purpose again；Providing one kind can be by complicated electricity
Force system is equivalent to the equivalence method of relatively simple system, can be applied in the analysis and control technology of all kinds of power systems.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals：
A kind of alternating current-direct current series-parallel connection Power Systems/voltage stability margin appraisal procedure containing multi-infeed HVDC, its feature
It is, comprises the following steps：
Step 1：Using the equipment such as the phasor measurement unit in power system and the electricity of all generator ports of technical limit spacing
Press phasor；
Step 2：Using under equivalent load in the equipment such as the phasor measurement unit in power system and technical limit spacing power network
Net electric current phasor, obtain the ac-side current phasor of DC converter in power network；
Step 3：By the service data obtained in step 1 and step 2, with reference to electrical network parameter, by complicated electric power system to institute
The node equivalent of concern is simple power system；
Step 4：By the simple power system obtained by step 3, its power/voltage stability margin index is calculated；
Step 5：The power/voltage stability margin index of gained is calculated by step 4, compared with stability boundaris, is judged
The power/voltage stable case of node.
In a kind of above-mentioned alternating current-direct current series-parallel connection Power Systems/voltage stability margin assessment side containing multi-infeed HVDC
Method, in described step 3, by complicated electric power system to concrete operation method that node equivalent of interest is simple power system
It is as follows：
Step 3.1, according to the service data obtained in step 1 and step 3, with reference to electrical network parameter, row are write out such as formula (1) shape
The electricity grid network equation of formula
Footmark LD, DC, T and G represent load bus, alternating current-direct current point of common coupling, contact node and generator respectively in formula
Node；
Step 3.2, the form by the network equation abbreviation in step 3.1 for formula (2)
In formula, footmark L represents broad sense load bus, is the element that all footmarks are LD, DC and T in formula (1)；
Step 3.3, the formula (2) obtained according to step 3.2 represents the voltage of all broad sense load buses, turns into formula
(3) form
VL=MVG+ZLLIL (3)
In formula,M=-ZLLYLG；
Step 3.4, complicated electric power system is equivalent to simple power system, makes equivalent voltage sourceMake equivalent impedanceForm the related ginseng of single system
Number.
In a kind of above-mentioned alternating current-direct current series-parallel connection Power Systems/voltage stability margin assessment side containing multi-infeed HVDC
Method, in described step 4, the method for calculating power/voltage stability margin index is：
In formula, PVSI is described power/voltage stability margin index, and S is direct current injecting power or the mould of load power
Value, Z are system impedance or the modulus value of equivalent impedance, and θ is the phase angle of system impedance or equivalent impedance,For direct current injecting power or
The phase angle of load power, E are system voltage source or the modulus value of equivalent voltage source.
In a kind of above-mentioned alternating current-direct current series-parallel connection Power Systems/voltage stability margin assessment side containing multi-infeed HVDC
Method, in described step 5, power/voltage stability boundaris is PVSI=1.Compared with PVSI=1, stability margin value is smaller, then surely
It is bigger to determine nargin.
A kind of alternating current-direct current series-parallel connection Power Systems/voltage stability margin appraisal procedure containing multi-infeed HVDC, its feature
It is, including by the equivalent equivalent way for simple power network of complex electric network, Power Systems/voltage stability margin index PVSI
Computational methods, Power Systems/voltage stability boundary determination.
Therefore, the invention has the advantages that：It is each 1. being simple power network by the complex electric network equivalence containing Various Components
It is convenient that class Power System Analysis provides with control technology；2. current intelligence is weighed using power/voltage stability margin index online
The power/voltage stability margin of lower power system, identify the weak node in network；3. by rate/voltage stability margin desired value
Contrasted with power/voltage stability boundaris, judge whether power system stablizes, guidance can be provided for On-line Control.
Brief description of the drawings
Fig. 1 is the canonical form for the alternating current-direct current series-parallel connection power system containing multi-infeed HVDC that the present invention is applicable.
Fig. 2 is the canonical form of the present invention forms complication system single system after equivalent.
Fig. 3 is the alternating current-direct current series-parallel connection power system containing multi-infeed HVDC that the embodiment of the present invention is based on.
Fig. 4 is the schematic diagram of the result obtained by step 4 of the embodiment of the present invention and step 5.
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
A kind of alternating current-direct current series-parallel connection Power Systems/voltage stability margin appraisal procedure containing multi-infeed HVDC, including with
Lower step：
Step 1：Using the phasor measurement unit equipment in power system and the voltage of all generator ports of technical limit spacing
Phasor；
Step 2：Using under equivalent load in the equipment such as the phasor measurement unit in power system and technical limit spacing power network
Net electric current phasor, obtain the ac-side current phasor of DC converter in power network；
Step 3：By the service data obtained in step 1 and step 2, with reference to electrical network parameter, by complicated electric power system to institute
The node equivalent of concern is simple power system, is specifically included：
Step 3.1, according to the service data obtained in step 1 and step 3, with reference to electrical network parameter, row are write out such as formula (1) shape
The electricity grid network equation of formula
Footmark LD, DC, T and G represent load bus, alternating current-direct current point of common coupling, contact node and generator respectively in formula
Node；
Step 3.2, the form by the network equation abbreviation in step 3.1 for formula (2)
In formula, footmark L represents broad sense load bus, is the element that all footmarks are LD, DC and T in formula (1)；
Step 3.3, the formula (2) obtained according to step 3.2 represents the voltage of all broad sense load buses, turns into formula
(3) form
VL=MVG+ZLLIL (3)
In formula,M=-ZLLYLG；
Step 3.4, complicated electric power system is equivalent to simple power system, makes equivalent voltage sourceMake equivalent impedanceForm the related ginseng of single system
Number.
Step 4：By the simple power system obtained by step 3, its power/voltage stability margin index is calculated, method is：
In formula, PVSI is described power/voltage stability margin index, and S is direct current injecting power or the mould of load power
Value, Z are system impedance or the modulus value of equivalent impedance, and θ is the phase angle of system impedance or equivalent impedance,For direct current injecting power or
The phase angle of load power, E are system voltage source or the modulus value of equivalent voltage source.
Step 5：The power/voltage stability margin index of gained is calculated by step 4, compared with stability boundaris, is judged
The power/voltage stable case of node, wherein, power/voltage stability boundaris is PVSI=1.Compared with PVSI=1, stablize abundant
Angle value is smaller, then stability margin is bigger.
The present invention includes being used for the equivalent equivalent way for simple power network of complex electric network, Power Systems/voltage is steady
Determine the determination of margin index PVSI computational methods, Power Systems/voltage stability boundary.
The canonical form that the present invention is previously mentioned in the accompanying drawings is only to spirit explanation for example of the invention.Belonging to the present invention
Those skilled in the art can apply the present invention in the including but not limited to various power systems of canonical form, but
Without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Although it is abundant more to have used multi-infeed HVDC to be measured, alternating current-direct current series-parallel connection power system, power/voltage to stablize herein
The terms such as degree, but it is not precluded from the possibility using other terms.Using these terms just for the sake of more easily description and
Explain the essence of the present invention；Any additional limitation is construed as all to disagree with spirit of the present invention.
Claims (3)
1. a kind of alternating current-direct current series-parallel connection Power Systems/voltage stability margin appraisal procedure containing multi-infeed HVDC, its feature exist
In comprising the following steps：
Step 1：Using the phasor measurement unit equipment in power system and the voltage phasor of all generator ports of technical limit spacing；
Step 2：Using the off line electricity of equivalent load in the equipment such as the phasor measurement unit in power system and technical limit spacing power network
Phasor is flowed, obtains the ac-side current phasor of DC converter in power network；
Step 3：By the service data obtained in step 1 and step 2, with reference to electrical network parameter, by complicated electric power system to of interest
Node equivalent be simple power system, specifically include：
Step 3.1, according to the service data obtained in step 1 and step 3, with reference to electrical network parameter, row are write out such as formula (1) form
Electricity grid network equation
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Footmark LD, DC, T and G represent load bus, alternating current-direct current point of common coupling, contact node and generator node respectively in formula；
Step 3.2, the form by the network equation abbreviation in step 3.1 for formula (2)
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In formula, footmark L represents broad sense load bus, is the element that all footmarks are LD, DC and T in formula (1)；
Step 3.3, the formula (2) obtained according to step 3.2 represents the voltage of all broad sense load buses, turns into formula (3)
Form
VL=MVG+ZLLIL (3)
In formula,M=-ZLLYLG；
Step 3.4, complicated electric power system is equivalent to simple power system, makes equivalent voltage sourceMake equivalent impedanceForm the relevant parameter of single system；
Step 4：By the simple power system obtained by step 3, its power/voltage stability margin index is calculated；
Step 5：The power/voltage stability margin index of gained, compared with stability boundaris, decision node are calculated by step 4
Power/voltage stable case.
2. according to a kind of alternating current-direct current series-parallel connection Power Systems/voltage stability margin containing multi-infeed HVDC described in claim 1
Appraisal procedure, it is characterised in that in described step 4, the method for calculating power/voltage stability margin index is：
In formula, PVSI is described power/voltage stability margin index, and S is the modulus value of direct current injecting power or load power, Z
For system impedance or the modulus value of equivalent impedance, θ is the phase angle of system impedance or equivalent impedance,For direct current injecting power or load
The phase angle of power, E are system voltage source or the modulus value of equivalent voltage source.
3. according to a kind of alternating current-direct current series-parallel connection Power Systems/voltage stability margin containing multi-infeed HVDC described in claim 1
Appraisal procedure, it is characterised in that in described step 5, power/voltage stability boundaris is PVSI=1；Compared with PVSI=1,
Stability margin value is smaller, then stability margin is bigger.
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| CN108923433A (en) * | 2018-07-10 | 2018-11-30 | 福州大学 | A kind of effective cutting load place on-line selection method improving voltage stability |
| CN108923439A (en) * | 2018-07-10 | 2018-11-30 | 福州大学 | A kind of on-line selection method in the effective reactive compensation place of electric system |
| CN110137943A (en) * | 2019-04-24 | 2019-08-16 | 上海电力学院 | Stability of power system judgment method and device based on broad sense operation short-circuit ratio |
| CN110768285A (en) * | 2019-11-19 | 2020-02-07 | 国网浙江省电力有限公司经济技术研究院 | Method for obtaining strength of alternating current-direct current hybrid direct current multi-feed-in receiving-end power grid |
| CN112421619A (en) * | 2020-11-09 | 2021-02-26 | 广东电网有限责任公司江门供电局 | Intelligent low-voltage distribution network voltage stability real-time monitoring method |
| CN112787351A (en) * | 2021-01-07 | 2021-05-11 | 国网江苏省电力有限公司经济技术研究院 | Coordination control method for low-voltage current limiting link of multi-loop direct current system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923433A (en) * | 2018-07-10 | 2018-11-30 | 福州大学 | A kind of effective cutting load place on-line selection method improving voltage stability |
| CN108923439A (en) * | 2018-07-10 | 2018-11-30 | 福州大学 | A kind of on-line selection method in the effective reactive compensation place of electric system |
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| CN110768285A (en) * | 2019-11-19 | 2020-02-07 | 国网浙江省电力有限公司经济技术研究院 | Method for obtaining strength of alternating current-direct current hybrid direct current multi-feed-in receiving-end power grid |
| CN112421619A (en) * | 2020-11-09 | 2021-02-26 | 广东电网有限责任公司江门供电局 | Intelligent low-voltage distribution network voltage stability real-time monitoring method |
| CN112787351A (en) * | 2021-01-07 | 2021-05-11 | 国网江苏省电力有限公司经济技术研究院 | Coordination control method for low-voltage current limiting link of multi-loop direct current system |
| CN112787351B (en) * | 2021-01-07 | 2022-07-19 | 国网江苏省电力有限公司经济技术研究院 | Coordination control method for low-voltage current limiting link of multi-loop direct current system |
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