CN104410071A - 35KV high voltage distribution network loop-closing and loop-opening current estimation method - Google Patents

35KV high voltage distribution network loop-closing and loop-opening current estimation method Download PDF

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Publication number
CN104410071A
CN104410071A CN201410794879.1A CN201410794879A CN104410071A CN 104410071 A CN104410071 A CN 104410071A CN 201410794879 A CN201410794879 A CN 201410794879A CN 104410071 A CN104410071 A CN 104410071A
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CN
China
Prior art keywords
kilovolts
loop
high voltage
voltage distribution
closing
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Pending
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CN201410794879.1A
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Chinese (zh)
Inventor
苏运
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Shanghai Electric Power Co Ltd
East China Power Test and Research Institute Co Ltd
Original Assignee
State Grid Shanghai Electric Power Co Ltd
East China Power Test and Research Institute Co Ltd
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Application filed by State Grid Shanghai Electric Power Co Ltd, East China Power Test and Research Institute Co Ltd filed Critical State Grid Shanghai Electric Power Co Ltd
Priority to CN201410794879.1A priority Critical patent/CN104410071A/en
Publication of CN104410071A publication Critical patent/CN104410071A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/003Load forecast, e.g. methods or systems for forecasting future load demand

Abstract

The invention relates to a 35KV high voltage distribution network loop-closing and loop-opening current estimation method. The method comprises steps as follows: 1) calculating a loop-closing current Itheta caused by the 220KV voltage difference; 2) calculating a loop-closing current IS caused by imbalance of loads of transformers on two sides; 3) adding the loop-closing currents to obtain the estimated loop-closing current I which is the sum of Itheta and IS. Compared with the prior art, the method has the advantages that influence factors caused by 220KV grid operation mode changes to subordinate grids are not required to be considered; only basic addition, subtraction, multiplication and division of complex numbers are involved during calculation, so that the method is easy to implement; iterative computations are not required during calculation, and the convergence problem does not exist; calculation results obtained with the estimation method are larger than actual current values and can be applied to dispatching production.

Description

A kind of 35 kilovolts of high voltage distribution networks close the current estimating method that unlinks
Technical field
The present invention relates to the imitation and calculation technology of electric power system, especially relate to a kind of 35 kilovolts of high voltage distribution networks and close the current estimating method that unlinks.
Background technology
The development of and urban distribution network interconnected along with large-scale power system, supply load density is more and more higher, and 220kV station is more and more intensive, and scheduling rank gets more and more.In scheduler routine runs; different 220 kilovolts of stations need to be undertaken turning over load operation by increasing 35 kilovolts of cyclizations; and by 35 kilovolts of cyclization networkings by formation 220 kilovolts of-35 kilovolts of electromagnetic looped networks; even 500 kilovolts of-35 kilovolts of electromagnetic looped networks; the electromagnetic looped network of different voltage grade may cause 35 kilovolts of Alloy White Iron larger; cause protection false tripping, affect day-to-day operation.
The method of existing calculating 35 kilovolts of Alloy White Iron is mainly system equivalent method, and the voltage levels electrical network by cyclization point both sides carries out whole equivalence, utilizes equivalent electrical network to carry out Current calculation.The equivalence method that the method uses needs the whole network equivalent, concerning large-scale power system, complicated Deng value-based algorithm, model, parameter accuracy and requirement of real-time are higher, and operational mode real-time change, equipment is numerous, and parameter maintenance amount is very large, equivalent result accuracy is difficult to ensure, 35 kilovolts of Alloy White Iron result of calculations often cannot meet application request.
Summary of the invention
Object of the present invention is exactly provide a kind of 35 kilovolts of high voltage distribution networks to close the current estimating method that unlinks to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of 35 kilovolts of high voltage distribution networks close the current estimating method that unlinks, and it is characterized in that, comprise the following steps:
1) the Alloy White Iron I that 220 kilovoltage differences cause is calculated θ;
2) the unbalanced Alloy White Iron I caused of both sides transformer load is calculated s;
3) above-mentioned two parts Alloy White Iron is added the Alloy White Iron I=I being estimation θ+ I s.
Described voltage difference comprises difference in magnitude and phase angle difference.
Described Alloy White Iron I θequal voltage difference divided by path impedance.
Described I sbe 110 kilovolts/35 kilovolts unbalanced electric current I caused of lateral load of 220 kilovolts of main transformers s.
Consider that the low-pressure side load of transformer will be respectively flowed through by two transformers, payload, with to flow through path impedance linearly proportional, can try to achieve according to linear ratio relation the unbalanced electric current I that 220 kilovolts of main transformer low-pressure side loads flow through cyclization point s.
Compared with prior art, the present invention has the following advantages:
1) do not need to consider the influencing factor of 220kV power system operating mode change to subordinate's electrical network;
2) in computational process, only relate to the basic addition subtraction multiplication and division method of plural number, be easy to realize;
3) do not need in computational process to carry out iterative computation, there is not convergence problem;
4) evaluation method result of calculation is bigger than normal compared with actual current value, can be used for scheduling and produces.
Accompanying drawing explanation
Fig. 1 is the winding diagram of 35 kilovolts of cyclization points.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Carry out Loop Closing Operation if suppose at figure below " 35 kilovolts of cyclization points " place, typical wiring figure as shown in Figure 1.
First according to principle of stacking, Alloy White Iron I is divided into two parts:
1, the Alloy White Iron that causes of 220 kilovoltage differences (comprising difference in magnitude and phase angle difference): I θ.
Suppose that 220 kilovolts of systems are Infinite bus system, 220 kilovolt of two side bus voltage difference and phase angle difference constant (reality can diminish) before and after cyclization, the Alloy White Iron I that 220 kilovoltage differences cause θequal voltage difference divided by path impedance.
2, the unbalanced Alloy White Iron I caused of both sides transformer load s.
I.e. 110 kilovolts/35 kilovolts unbalanced electric current I caused of lateral load of 220 kilovolts of main transformers s.Consider that the low-pressure side load of transformer will be respectively flowed through by two transformers, payload is with to flow through path impedance linearly proportional.The unbalanced electric current that 220 kilovolts of main transformer low-pressure side loads flow through cyclization point can be tried to achieve according to impedance proportionate relationship.
Above-mentioned two parts Alloy White Iron is added the Alloy White Iron I=I being estimation θ+ I s.
Compared with traditional the whole network equivalence method, this Alloy White Iron evaluation method does not need to consider the influencing factor of 220kV power system operating mode change to subordinate's electrical network; In computational process, only relate to the addition subtraction multiplication and division method that plural number is basic, be easy to realize; Do not need in computational process to carry out iterative computation, there is not convergence problem; Evaluation method result of calculation is bigger than normal compared with actual current value, can be used for scheduling and produces.
Cyclization is carried out from 35 kilovolts of different 500 kilovolts of partition power grid at certain electrical network, actual Alloy White Iron 913 amperes, these 35 kilovolts of high voltage distribution networks close the current estimating method that unlinks and calculate Alloy White Iron 1040 amperes, and result of calculation, slightly larger than actual value, can be used for actual schedule and produces.

Claims (5)

1. 35 kilovolts of high voltage distribution networks close the current estimating method that unlinks, and it is characterized in that, comprise the following steps:
1) the Alloy White Iron I that 220 kilovoltage differences cause is calculated θ;
2) the unbalanced Alloy White Iron I caused of both sides transformer load is calculated s;
3) above-mentioned two parts Alloy White Iron is added the Alloy White Iron I=I being estimation θ+ I s.
2. a kind of 35 kilovolts of high voltage distribution networks according to claim 1 close the current estimating method that unlinks, and it is characterized in that, described voltage difference comprises difference in magnitude and phase angle difference.
3. a kind of 35 kilovolts of high voltage distribution networks according to claim 1 close the current estimating method that unlinks, and it is characterized in that, described Alloy White Iron I θequal voltage difference divided by path impedance.
4. a kind of 35 kilovolts of high voltage distribution networks according to claim 1 close the current estimating method that unlinks, and it is characterized in that, described I sbe 110 kilovolts/35 kilovolts unbalanced electric current I caused of lateral load of 220 kilovolts of main transformers s.
5. a kind of 35 kilovolts of high voltage distribution networks according to claim 1 close the current estimating method that unlinks, it is characterized in that, consider that the low-pressure side load of transformer will be respectively flowed through by two transformers, payload, with to flow through path impedance linearly proportional, can try to achieve according to linear ratio relation the unbalanced electric current I that 220 kilovolts of main transformer low-pressure side loads flow through cyclization point s.
CN201410794879.1A 2014-12-19 2014-12-19 35KV high voltage distribution network loop-closing and loop-opening current estimation method Pending CN104410071A (en)

Priority Applications (1)

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CN201410794879.1A CN104410071A (en) 2014-12-19 2014-12-19 35KV high voltage distribution network loop-closing and loop-opening current estimation method

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CN104410071A true CN104410071A (en) 2015-03-11

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109347091A (en) * 2018-10-10 2019-02-15 云南电网有限责任公司瑞丽供电局 Quick power distribution network closes unlink feasibility judgment method and device
CN110190601A (en) * 2019-07-01 2019-08-30 云南电力技术有限责任公司 A kind of closed loop network turns the method, apparatus and system of power supply
CN113131471A (en) * 2021-04-20 2021-07-16 国网山东省电力公司聊城供电公司 Power grid forbidden loop judgment method based on electromagnetic loop de-grid recursive function

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101431255A (en) * 2008-11-17 2009-05-13 国电南瑞科技股份有限公司 Closed loop operation risk analysis method for power system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101431255A (en) * 2008-11-17 2009-05-13 国电南瑞科技股份有限公司 Closed loop operation risk analysis method for power system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
N. VEMPATI等: "《Simplified Feeder Modeling For Loadflow Calculations》", 《IEEE TRANSACTIONS ON POWER SYSTEMS》 *
李江华: "《浅析10KV配网合环产生环流的原因及预防措施》", 《电网技术》 *
白玉东等: "《计及分支负荷分布的配电网合环稳态电流计算》", 《现代电力》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109347091A (en) * 2018-10-10 2019-02-15 云南电网有限责任公司瑞丽供电局 Quick power distribution network closes unlink feasibility judgment method and device
CN109347091B (en) * 2018-10-10 2021-10-01 云南电网有限责任公司瑞丽供电局 Method and device for judging ring closing and opening feasibility of rapid power distribution network
CN110190601A (en) * 2019-07-01 2019-08-30 云南电力技术有限责任公司 A kind of closed loop network turns the method, apparatus and system of power supply
CN113131471A (en) * 2021-04-20 2021-07-16 国网山东省电力公司聊城供电公司 Power grid forbidden loop judgment method based on electromagnetic loop de-grid recursive function
CN113131471B (en) * 2021-04-20 2022-04-19 国网山东省电力公司聊城供电公司 Power grid forbidden loop judgment method based on electromagnetic loop de-grid recursive function

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