CN102868227B - Medium voltage distribution-network looped-network switching operation method - Google Patents
Medium voltage distribution-network looped-network switching operation method Download PDFInfo
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- CN102868227B CN102868227B CN201210374142.5A CN201210374142A CN102868227B CN 102868227 B CN102868227 B CN 102868227B CN 201210374142 A CN201210374142 A CN 201210374142A CN 102868227 B CN102868227 B CN 102868227B
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Abstract
The invention discloses a medium voltage distribution-network looped-network switching operation method. Loop closing load flow calculation, short circuit calculation analysis and the existing site checking phase sequence are carried out before looped-network switching, a non-out-of-limit protection constant value and equipment dynamic and static limits are guaranteed, line phase sequences of looped-network operation is guaranteed, loop closing time is controlled to be minimum, the shorter the loop closing time is, the better the effects are, unforeseen circumstances such as line overload, relaying protection movement tripping, short circuits of closing loop moment power grids, damage to safety of lines and equipment and even equipment damage caused by big circulation are effectively avoided, safe operation of the power grid is guaranteed, operating efficiency of the power distribution network is effectively improved, and adverse effects of construction and overhaul on power supply management and users are effectively avoided.
Description
Technical field
The present invention relates to electric power overhaul technology field, particularly relate to a kind of middle voltage distribution networks looped network grid switching operation method.
Background technology
Urban Medium Voltage Distribution Network directly towards numerous urban subscribers, along with the development in city, construction, maintenance more and more frequent.Traditional construction method, before and after maintenance, all needs to carry out power failure grid switching operation, and each operation power failure 20-30 minute, causes frequent power failure thus, cause inconvenience and huge economic loss to power supply management and user.
Summary of the invention
The object of the invention is to overcome prior art deficiency, provide a kind of power failure can carry out the middle voltage distribution networks looped network grid switching operation method of grid maintenance construction.
The technical scheme adopted for realizing object of the present invention is: a kind of middle voltage distribution networks looped network grid switching operation method, comprises the following steps:
A. carry out closed loop power flow to calculate and short circuit calculation analysis, move the steady limit for criterion with not out-of-limit protection definite value and equipment, auxiliary dispatching decision-making;
B. on-the-spot Check Phase Sequence, guarantees that the line phase-sequence detection that looped network operates is consistent;
C. first interconnection switch between transformer station is closed;
D. the block switch of faulty line near described interconnection switch end is separated again;
E. the block switch of faulty line near transformer substation end is finally separated.
The present invention adopts the method for looped network grid switching operation, closed loop power flow calculating should be carried out before looped network back brake, short circuit calculation is analyzed and present on-the-spot Check Phase Sequence, guarantee that not out-of-limit protection definite value and equipment move the steady limit, guarantee that the line phase-sequence detection that looped network operates is consistent, and by cyclization time controling to minimum, the smaller the better, efficiently avoid the circulation that generation is larger, cause circuit overload, relaying protection action is tripped, and cyclization moment electrical network is short-circuited, jeopardize the safety of circuit and equipment, even make the generation of the fortuitous events such as device damage, ensure that the safe operation of electrical network, effectively improve the operational efficiency of power distribution network, efficiently avoid construction, maintenance is to the adverse effect of giving power supply management and user.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further:
Fig. 1 is three segmentation two interconnector figure of the present invention;
Fig. 2 is that cyclization of the present invention simplifies procedure chart;
Fig. 3 is nodal equilibrium equation evolution diagram;
Contrast table before and after the cyclization of Fig. 4 short circuit current.
Embodiment
Embodiment one
Tidal current computing method and software for calculation
Load flow calculation mathematically can be summed up as and solves Nonlinear System of Equations, and its Mathematical Modeling is write a Chinese character in simplified form as follows:
F (X)=0 is Nonlinear System of Equations
Wherein:
F=(f1, f2 ..., f n) and T is nodal equilibrium equation formula;
X=(x1, x2 ..., x n) and T is each node voltage to be asked.
Software for calculation: " Based on Power System Analysis Software Package " (PSASP) that DianKeYuan development is write can be adopted.
As shown in Figure 2: on the south positive electricity net 110kV build west and become and become cyclization simplify procedure chart into example with 110kV riverfront, build west change before supposing cyclization, riverfront change high side bus voltage 1,2 node is respectively U1, U2, medium voltage side 3,4 node U3, U4, transmission power is respectively Sa, Sb, and the equivalent impedance of node 1,4 relative system is respectively Z1, Z2; Circuit L1, L2 impedance is respectively ZL1, ZL2; Transformer station's other feeder load sum equivalences except cyclization feeder line are a point load, be respectively S1, S2, UN is cyclization point voltage after cyclization, so, as shown in Figure 3: from formula (5) (6), the power flow through in loop can think the superposition of two power, a part be voltage equal time natural equal power, another part power depends on both end voltage phasor difference
with looped network total impedance
,
for circulating power,
, circulating power is directly proportional to both end voltage difference, is inversely proportional to loop total impedance.When cyclization point both end voltage is equal,
=0,
larger, circulating power is larger, and loop total impedance is less, and circulating power is larger.
So looped network grid switching operation reduces the measure of circulation: by measures such as main transformer pressure regulation, cyclization circuit both end voltage difference is adjusted to suitably little, to improve the ratio of distribution line looped network operation.
Embodiment two
Short circuit calculation
With the not super switch rupturing capacity of the most serious three short circuit current for criterion, when exceeding, abandon looped network operation.Main calculating cyclization moment:
(1) cyclization circuit generation three-phase shortcircuit;
(2) 10kV bus generation three-phase shortcircuit;
(3) 110 kV bus generation three-phase shortcircuits;
(4) 220 kV bus generation three-phase shortcircuits.
If above-mentioned four kinds of situation short circuit currents are all no more than each electric pressure switch rupturing capacity, then during cyclization pair
Switch at different levels is without impact.
As shown in Figure 4: 10kV west supplies two wires cyclization moment for two wires and 10kV shore, calculation of short-circuit current table, as can be seen from the table, distribution line cyclization moment, after cyclization, short circuit current all increases to some extent than short circuit current before cyclization, but to 220kV, 110kV electric network influencing is very little, almost negligible, 110 kV Luo Zhuan become, after jujube woods becomes main transformer fanout operation, short circuit current reduces greatly, but after 220 kV transforming plant main transformer split operations, short circuit current reduces very little, think the ratio improving distribution line looped network grid switching operation, 110kV transforming plant main transformer normal operating mode should be fanout operation, and 110kV transformer station is all configured with mother automatic throw-in equipment of emergency power supply, power supply reliability still can ensure, system short circuit capacity can also be reduced, be conducive to the safe operation of electrical network and the safe looped network grid switching operation of distribution.
Embodiment three
As shown in Figure 1, a kind of middle voltage distribution networks looped network grid switching operation method, comprises the following steps:
F. carry out closed loop power flow to calculate and short circuit calculation analysis, move the steady limit for criterion with not out-of-limit protection definite value and equipment, auxiliary dispatching decision-making;
G. on-the-spot Check Phase Sequence, guarantees that the line phase-sequence detection that looped network operates is consistent;
H. first interconnection switch L1 between transformer station A, B is closed;
I. the block switch K1 that faulty line A holds near described interconnection switch L1 is separated again;
J. the block switch Z1 that faulty line A holds near transformer station A is finally separated.
The present invention adopts the method for looped network grid switching operation, closed loop power flow calculating should be carried out before looped network back brake, short circuit calculation is analyzed and present on-the-spot Check Phase Sequence, guarantee that not out-of-limit protection definite value and equipment move the steady limit, guarantee that the line phase-sequence detection that looped network operates is consistent, and by cyclization time controling to minimum, the smaller the better, efficiently avoid the circulation that generation is larger, cause circuit overload, relaying protection action is tripped, and cyclization moment electrical network is short-circuited, jeopardize the safety of circuit and equipment, even make the generation of the fortuitous events such as device damage, ensure that the safe operation of electrical network, effectively improve the operational efficiency of power distribution network, efficiently avoid construction, maintenance is to the adverse effect of giving power supply management and user.
Claims (1)
1. a middle voltage distribution networks faulty line looped network grid switching operation method, is characterized in that: comprise the following steps:
A. carry out closed loop power flow to calculate and short circuit calculation analysis, move the steady limit for criterion with not out-of-limit protection definite value and equipment, auxiliary dispatching decision-making;
B. by main transformer adjusting pressure measure, cyclization circuit both end voltage difference is adjusted to suitably little, to improve the ratio of distribution line looped network operation, middle voltage distribution networks transforming plant main transformer normal operating mode is fanout operation, and transformer station is all configured with mother automatic throw-in equipment of emergency power supply;
C. on-the-spot Check Phase Sequence, guarantees that the line phase-sequence detection that looped network operates is consistent;
D. first interconnection switch between transformer station is closed;
E. the block switch of faulty line near interconnection switch end is separated again;
F. the block switch of faulty line near transformer substation end is finally separated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210374142.5A CN102868227B (en) | 2012-10-07 | 2012-10-07 | Medium voltage distribution-network looped-network switching operation method |
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| CN201210374142.5A CN102868227B (en) | 2012-10-07 | 2012-10-07 | Medium voltage distribution-network looped-network switching operation method |
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| CN102868227A CN102868227A (en) | 2013-01-09 |
| CN102868227B true CN102868227B (en) | 2015-05-06 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103560513A (en) * | 2013-11-21 | 2014-02-05 | 国家电网公司 | Method and device for determining loop closing time |
| CN105429137B (en) * | 2015-12-09 | 2017-10-17 | 云南电网有限责任公司红河供电局 | The method that distribution network closed loop turns power supply |
| CN105552882B (en) * | 2015-12-09 | 2018-03-27 | 云南电网有限责任公司红河供电局 | A kind of control method of power network cyclization |
| CN110865255B (en) * | 2019-11-21 | 2021-10-22 | 国网北京市电力公司 | 10kV power distribution network line reversing method |
| CN112433118B (en) * | 2020-11-16 | 2022-07-01 | 国网山东省电力公司聊城供电公司 | Anti-misoperation simulation device and method for 10kV medium-voltage power generation vehicle |
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Non-Patent Citations (1)
| Title |
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| 中山市配电网合环辅助决策支持系统开发;庞嘉琦;《中国优秀硕士学位论文全文数据库》;20111215;说明书第1页至10页，第23页最后一段至26页，第60页 * |
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