CN103715692A - 1000kV/500kV/220kV electromagnetic looped network looping-off opportunity selection method - Google Patents
1000kV/500kV/220kV electromagnetic looped network looping-off opportunity selection method Download PDFInfo
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Abstract
The invention provides a 1000kV/500kV/220kV electromagnetic looped network looping-off opportunity selection method. Specific analysis is conducted in such aspects as the stability characteristic of a power grid, short-circuit currents and the fact of whether a high-voltage-class failure will cause a low-voltage-class cascading failure or not, and evaluation is conducted on the safety and stability characteristics and operation of a system from multiple angles. All steps of the method are based on related power grid planning and engineering researchable design; in addition to conventional emulating calculation, a typical expert theory model and method are also combined, a reference basis is provided for electric power system planning and design and actual power grid operation, and important technical support is provided for safe and stable development of an ultra-high voltage grid.
Description
Technical field
The present invention relates to a kind of system of selection, specifically relate to a kind of 1000kV/500kV/220kV electromagnetic looped network choose opportunities method of unlinking.
Background technology
Along with extra-high voltage grid Accelerating The Construction, work about electric power person conducts in-depth research and has obtained research widely the variation of the safety and stability characteristic after ultra high voltage access electrical network.
Electromagnetic looped network refers to that the link tester of different electric pressures operation crosses two ends transformer magnetic loop parallel running, and its formation is the interim product in power network development process, is a kind of electric network composition of transition stage.In the process progressively developing at extra-high voltage grid, the electrical network parallel running of the electrical network of 1000kV and 500kV, electromagnetic looped network operates in performance equipment ability to transmit electricity, and assurance power supply is reliably sent and improves the aspects such as mains supply reliability and played beneficial effect.Along with the remarkable reinforcement of a high step voltage electric network composition and the obvious improvement of running environment, also there is some problems in electromagnetic looped network.
By research extra high voltage line, building up the rear impact on electrical network finds, the electromagnetic looped network structure that extra high voltage line and 500kV circuit form, a large amount of trends all easily occur after N-2 or 500kV circuit N-2 occur extra high voltage line to be transferred on remaining 500kV circuit, cause 500kV line load to meet or exceed the steady limit of heat of circuit self, a large amount of transfers of load probably cause system stability malicious event.Be subject to the constraint of electromagnetic looped network problem, the transmitting capacity of the electric wire netting that extra high voltage line and 500kV circuit form is restricted.
Electromagnetic looped network operation can bring the problems such as power transfer, short circuit current, brings hidden trouble to the safe and stable operation of electrical network.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of 1000kV/500kV/220kV electromagnetic looped network choose opportunities method of unlinking, from stabilization of power grids characteristic, short circuit current, whether voltage levels fault can cause the several aspects of low-voltage-grade cascading failure to be made a concrete analysis of, and from a plurality of angles, the safety and stability characteristic operation of system is evaluated.Electric Power Network Planning, the engineering of each step of the present invention based on relevant can be ground design, except conventional simulation calculation, also typical expert's theoretical model and theoretical method have been merged, for the operation of planning and design of power system and actual electric network provides reference frame, for realizing the safety and stability development of extra-high voltage grid, provide important technical support.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of 1000kV/500kV/220kV electromagnetic looped network choose opportunities method of unlinking, said method comprising the steps of:
Step 1: determine electromagnetic looped network in short circuit current and trend transfer party in the face of electric network influencing;
Step 2: analyze the ability to transmit electricity constraint after fault of the electrical network that causes due to electromagnetic looped network;
Step 3: the impact before and after unlinking according to the principle contrast actual electric network of unlinking;
Step 4: judge whether electromagnetic looped network unlinks.
Described step 1 comprises the following steps:
Step 1-1: determine the direct impact of electromagnetic looped network on extra-high voltage grid safety and stability aspect according to the service conditions of electrical network and operation characteristic;
Step 1-2: calculate by calculation of short-circuit current, trend calculating and stability, determine short circuit current, trend transfer characteristic and the transient stability characteristic of extra-high voltage grid.
Described service conditions comprises workload demand, trend trend, voltage, electric current and frequency, described operation characteristic comprise electrical network resist the ability of fault and fault before and after trend distribute.
Described step 2 comprises the following steps:
Step 2-1: carry out trend simulation calculation according to operation characteristic, draw the tide flow size shifting on 500kV after 1000kV fault, 220kV circuit;
Step 2-2: according to whether there is the out-of-limit situation of trend after the steady limitation table failure judgement of circuit heat of actual measurement, carry out power system transient simulation calculating simultaneously and judge whether to cause the chain unstability fault of transient state;
Step 2-3: according to the steady restriction of electrical network heat after the arbitrary element fault of extra-high voltage grid and steady restriction temporarily, determine that electromagnetic looped network is for the constraint of electrical network cross sections ability to transmit electricity.
In described step 3, according to the principle of unlinking, make a concrete analysis of judgement 1000/500kV electromagnetic looped network and the impact of 500/220kV electromagnetic looped network on system safety stability.
The described principle of unlinking comprises:
A) open tri-grades of electromagnetic looped networks of 1000/500/220kV, guarantee after 1000kV, 500kV line fault, the unlikely 220kV electrical network generation cascading failure that causes;
B) consider the front this area power supply and load distributes, trend flows to, main transformer is made a bet power, safety and stability characteristic and power supply reliability of unlinking, and avoid power supply reliability reduction, the some areas of because of unlinking, causing to occur Voltage-stabilizing Problems;
C) after electromagnetic looped network unlinks, arbitrary circuit, main transformer or generator failure or fault-free disconnect, and meet power system safety and stability operation and do not cause other elements to surpass the requirement of regulation accident overload and voltage permissible variation.
In described step 4, whether the Pros and Cons that unlinks and bring of electromagnetic looped network relatively, can meet according to the mains supply ability after unlinking the feasibility that the Location of requirement of electrical network unlinks, if meet, unlinks.
Compared with prior art, beneficial effect of the present invention is:
1. from stabilization of power grids characteristic, short circuit current, whether voltage levels fault can cause the several aspects of low-voltage-grade cascading failure to be made a concrete analysis of, and from a plurality of angles, the safety and stability characteristic operation of system is evaluated;
2. Electric Power Network Planning, the engineering of each step of the present invention based on relevant can be ground design, except conventional simulation calculation, also typical expert's theoretical model and theoretical method have been merged, for the operation of planning and design of power system and actual electric network provides reference frame, for realizing the safety and stability development of extra-high voltage grid, provide important technical support;
3. both can apply to the power system planning stage selects the more excellent access scheme of combination property, can apply to again the power system operation stage for system, formulate security and stability control measurement reference is provided.
Accompanying drawing explanation
Fig. 1 is the 1000kV/500kV/220kV electromagnetic looped network choose opportunities method flow diagram that unlinks;
Fig. 2 is that in the embodiment of the present invention, ultra high voltage south semi-ring ac transmission access diagram is sent in electricity east in Anhui;
Fig. 3 is electromagnetic looped network operation tidal current chart between following 5-10 Anhui-Zhejiang Province in the embodiment of the present invention;
Fig. 4 is electromagnetic looped network solution inscription of loop tidal current chart between following 5-10 Anhui-Zhejiang Province in the embodiment of the present invention;
Fig. 5 is that in the embodiment of the present invention, engineering loopful figure is sent in electricity east in Anhui;
Fig. 6 is that in the embodiment of the present invention, electricity east in Anhui send engineering loopful to build up electromagnetic looped network operation tidal current chart between rear Shanghai-Jiangsu Province;
Fig. 7 is that in the embodiment of the present invention, electricity east in Anhui send engineering loopful to build up electromagnetic looped network solution inscription of loop tidal current chart between rear Shanghai-Jiangsu Province.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The invention provides a kind of 1000kV/500kV/220kV electromagnetic looped network choose opportunities method of unlinking, said method comprising the steps of:
Step 1: determine electromagnetic looped network in short circuit current and trend transfer party in the face of electric network influencing;
Step 2: analyze the ability to transmit electricity constraint after fault of the electrical network that causes due to electromagnetic looped network;
Step 3: the impact before and after unlinking according to the principle contrast actual electric network of unlinking;
Step 4: judge whether electromagnetic looped network unlinks.
Described step 1 comprises the following steps:
Step 1-1: determine the direct impact of electromagnetic looped network on extra-high voltage grid safety and stability aspect according to the service conditions of electrical network and operation characteristic;
Step 1-2: calculate by calculation of short-circuit current, trend calculating and stability, determine short circuit current, trend transfer characteristic and the transient stability characteristic of extra-high voltage grid.
Described service conditions comprises workload demand, trend trend, voltage, electric current and frequency, described operation characteristic comprise electrical network resist the ability of fault and fault before and after trend distribute.
Described step 2 comprises the following steps:
Step 2-1: carry out trend simulation calculation according to operation characteristic, draw the tide flow size shifting on 500kV after 1000kV fault, 220kV circuit;
Step 2-2: according to whether there is the out-of-limit situation of trend after the steady limitation table failure judgement of circuit heat of actual measurement, carry out power system transient simulation calculating simultaneously and judge whether to cause the chain unstability fault of transient state;
Step 2-3: according to the steady restriction of electrical network heat after the arbitrary element fault of extra-high voltage grid and steady restriction temporarily, determine that electromagnetic looped network is for the constraint of electrical network cross sections ability to transmit electricity.
In described step 3, according to the principle of unlinking, make a concrete analysis of judgement 1000/500kV electromagnetic looped network and the impact of 500/220kV electromagnetic looped network on system safety stability.
The described principle of unlinking comprises:
A) should open in principle tri-grades of electromagnetic looped networks of 1000/500/220kV, but the overriding concern factor that fail safe is electromagnetic looped network unlinks.For 1000/500/220kV electromagnetic looped network, guarantee after 1000kV, 500kV line fault the unlikely 220kV electrical network generation cascading failure that causes;
A-1) electromagnetic looped network operation has considerable influence to power network safety operation and ability to transmit electricity, the required supplementary measures of unlinking are simple, after separating inscription of loop, on the basis of eliminating electromagnetic looped network impact, do not produce added influence, the condition maturity that unlinks is described, can implement to unlink.
A-2) electromagnetic looped network operation has certain influence to power network safety operation and ability to transmit electricity, but may bring impact to the normal operation of electrical network after separating inscription of loop, need to have corresponding conveyance system measure just can unlink.To this, need to analyze complicated and simple degree and the scale of supplementary measures, further determine and unlink opportunity.
A-3) electromagnetic looped network operation needs supplementary measures to not affecting power network safety operation, unlinking, and can not be eager to unlink by force.This principle difference to some extent when the concrete enforcement of 1000/500kV and 500/220kV, between the province of 500kV, interconnection has the function of transmitting electricity or regulating supply and demand in region, in the situation that not affecting safe and stable operation, unlink both unnecessary also uneconomical, so should adhere to not unlinking for principle; 500/220kV electromagnetic looped network can adopt mode more flexibly to process.
B) consider the front this area power supply and load distributes, trend flows to, main transformer is made a bet power, safety and stability characteristic and power supply reliability of unlinking, and avoid power supply reliability reduction, the some areas of because of unlinking, causing to occur Voltage-stabilizing Problems;
B-1) in the area power grid after unlinking, should there be three and above 500kV/220kV connection to become; The power supply that has two different directions to the 220kV transformer station of main load power supply at least, when losing any one directional traffic power source, the power supply of another direction can guarantee the load supply of entirely standing.
B-2) if unlink under the prerequisite only with two connection changes, a connection becomes under maintenance mode, and another connection accident barrier causes area power grid and major network off-the-line, and the area power grid after off-the-line should not exist voltage, merit angle, frequency stabilization problem.
B-3) 220kV of open loop point 500kV transformer station bus connection type should be taked two female single segmentations or the two segmentations of two mother.
B-4) should be according to the load distribution situation of each department electrical network, rational deployment area power grid power supply, after guaranteeing to unlink, each department electric network active power and reactive power are in a basic balance as far as possible, meet the requirements such as regional power network safety operation, spinning reserve, voltage power-less support.But local lonely network operation issuable " the large little net of machine " problem after should noting unlinking.
B-5) unlink after each department trends flow to and large change should not occur; For area power grid, under large load method, 500kV main transformer load factor should leave certain nargin.Particularly, be subject to the area power grid that electric proportion is larger, the issuable frequency of local lonely network operation, Voltage-stabilizing Problems after should noting unlinking, further investigation area power grid low frequency, the measure of low pressure off-load and corresponding unit relate to net safeguard measure.
C), after electromagnetic looped network unlinks, each subregion should reach the requirement of < < guiding rules of power system safety and stability > >.Arbitrary circuit, main transformer or generator failure or fault-free disconnect, and meet power system safety and stability operation and do not cause other elements to surpass the requirement of regulation accident overload and voltage permissible variation.
In described step 4, whether the Pros and Cons that unlinks and bring of electromagnetic looped network relatively, can meet according to the mains supply ability after unlinking the feasibility that the Location of requirement of electrical network unlinks, if meet, unlinks.
Embodiment
The present invention adopts applicant's independent development " PSD electric power system Software tool (PSD Power Tools) " groupware bag, simulation calculation instrument as this research, mainly comprises: PSD-PFNT flow calculation program, PSD-SWNT transient stability computation program, PSD-SCCPC short-circuit current calculation program, the geographical jiexian figure drawing program of PSD-CLIQUE and many curve comparisons of PSD-MYCHART program.
1. the 1000kV/500kV/220kV electromagnetic looped network of engineering Anhui-Zhejiang section is sent in electricity east in Anhui
The first step is according to actual electric network situation and characteristic, and the electromagnetic looped network that analysis forms is for the impact of ultra high voltage rack;
As Fig. 2, the Wan electricity Dong building up for the end of the year 2013 send ultra-high voltage AC transmission engineering, circuit by way of Anhui, Zhejiang, Shanghai 3 provinces and cities, passage is sent in the ultra high voltage east that forms Huainan～Wan Nan～Zhe Bei～Hu Xi.Total line length is 647.4km, and engineering is being born the task of the electric power of Huainan Thermal Power Bases being sent to Zhe Bei, Shanghai load center.
On the section in Anhui-Zhejiang, formed tri-grades of electromagnetic looped networks of 1000kV/500kV/220kV:
1, north, 1000kV Wan Nan-Zhejiang circuit, southern station, Anhui main transformer and northern station, Zhejiang main transformer;
2,500kV Wan Nan～Chu Cheng circuit, 500kV Chu Cheng main transformer and flourishing main transformer, flourishing Jiangsu, the Jiangsu arrived is to Zhejiang 500kV circuit;
3,220kV circuit between the flourishing Bian He Chu Cheng change in Wuhu Region.
Carry out the analysis of electromagnetic looped network and find, according to the electrical network of the near region, grid plan modification Anhui-Zhejiang of following 5-10, under the operation of electromagnetic looped network looped network, trend distributes as shown in Figure 3.Between province, two 500kV trends are all lighter, as 500kV circuit between economizing, mainly bring into play interconnection function.
The ultra high voltage rack ability to transmit electricity constraint that second step labor causes due to electromagnetic looped network.
Through security and stability analysis, there is alternating current circuit " N-1 ", " N-2 " in system, and single, double utmost point locking fault occurs direct current, and it is stable that system all can keep, and also can not cause circuit overload.From short circuit current, the relevant transformer station in electromagnetic looped network both sides short circuit current is all below 60kA.Before and after Anhui-Zhejiang 1000/500kV electromagnetic looped network unlinks, the relevant 500kV of transformer station busbar short-circuit electric current is in Table 1.
Table 1
The 3rd step contrasts the impact before and after unlinking according to three principles of unlinking.
Carry out scheme contrast, this electromagnetic looped network is unlinked, off-the-line is respected booth～bottle kiln, drop～Fuyang, river circuit (recovering Fuyang～Xiao Pu double loop).After unlinking, trend as shown in Figure 4.Because original 500kV passage carries trend very little, therefore for other passages, especially the trend of extra-high-voltage alternating current passage does not have impact substantially.
From short circuit current, to untie after electromagnetic looped network, both sides short circuit current declines to some extent.Because Level In The Fuyang Station is for fear of becoming terminal load station, reliability decrease, so recover Fuyang～Xiao Pu double back, short circuit current goes up not down.Through security and stability analysis, there is alternating current circuit " N-1 ", " N-2 " in system, and single, double utmost point locking fault occurs direct current, and it is stable that system all can keep, and also can not cause circuit overload.
The 4th step carries out reaching a conclusion after simulating, verifying: between Anhui-Zhejiang Province, the 1000/500kV electromagnetic looped network necessity of unlinking is little, and suggestion maintains electromagnetic looped network operation.
2. the 1000kV/500kV electromagnetic looped network of loopful engineering Shanghai-Jiangsu section is sent in electricity east in Anhui
The first step is according to actual electric network situation and characteristic, and the electromagnetic looped network that analysis forms is for the impact of ultra high voltage rack; After electricity east, Anhui send engineering loopful to put into operation, be no longer just single line power transmission rack, but an annular rack:
Shanghai-Jiangsu has 2 500kV passages, is respectively granary～double back that creeps and Stone steles～Huang and crosses double back.Along with Wan electricity Dong send engineering loopful engineering, build up, Stone steles～Huang crosses double loop " π " and enters ultra high voltage station, Suzhou.Ultra high voltage station, Suzhou is Jiangsu and Shanghai public ultra high voltage station, 2 main transformers of final scale supply Jiangsu for Shanghai, 2 main transformers, so it is for the main transformer 500kV bus denominator in He Gong Suzhou, Shanghai, so Stone steles～Huang crosses double loop " π ", enter behind ultra high voltage station, Suzhou, this circuit is equivalent to off-the-line.But still have granary～double back that creeps, form electromagnetic looped network with Taizhou～Suzhou 1000kV circuit, under electromagnetic looped network ruuning situation, its trend as shown in Figure 6.
The ultra high voltage rack ability to transmit electricity constraint that second step labor causes due to electromagnetic looped network.
From trend result, granary～circuit transmission power direction that creeps be Shanghai to Jiangsu, flow on the contrary with whole trend, and extra high voltage line forms the situation of load bypass, so flows to from trend, unreasonable.And main transformer power supply Shanghai, 2, station, Suzhou, causes Suzhou～Huang Du, the Huang Du～500kV transmission power that creeps heavier, approaches the steady limit of heat that has even surpassed circuit under normal mode.
The 3rd step contrasts the impact before and after unlinking according to three principles of unlinking.
If now maintain electromagnetic looped network structure, due to trend irrational distribution, cause electrical network to have safety problem, therefore need to carry out electromagnetic looped network and unlink, as shown in Figure 7.But this electromagnetic looped network unlinks, the electromagnetic looped network general from other unlinks different, the one, eliminate safe hidden trouble, the 2nd, meet Shanghai and be subject to electric requirement, therefore the scheme adopting is for to enter ultra high voltage station, Suzhou by granary～double back that creeps " π ", in order to control short circuit current, the 500kV side of 2 the ultra high voltage main transformers in station, Suzhou also adopts denominator form simultaneously.
Electricity east, Anhui send engineering loopful engineering to build up the initial stage, has formed Shanghai-Suzhou electromagnetic looped network, from distant view, need to untie electromagnetic looped network, but needs the opportunity of unlinking further clear and definite.From the initial stage, each 1, main transformer power supply Shanghai, 2, station, Suzhou, Jiangsu, it is relatively little that Shanghai is entered scale by AC network, and trend flows to and carries to Shanghai for Jiangsu.Along with being subject to the increase of electric scale, the 3rd main transformer of ultra high voltage station, Suzhou enlarging, 2 power supply Shanghai, granary now, Changshu Aera load growth, granary～the Line Flow that creeps turns to, electromagnetic looped network load bypass, now granary～the double-circuit line that creeps " π " should be entered to ultra high voltage station, Suzhou, untie electromagnetic looped network, but from short circuit current, after unlinking, if Jiangsu side only has 1 main transformer, the short circuit current at the station such as ultra high voltage station, Suzhou 500kV side and near Stone steles will improve, further increase along with the off line load of Jiangsu side, build the 4th main transformer, and at 500kV side denominator, to control short circuit current.
Under above-mentioned definite structure, Shanghai 500kV short circuit current to be calculated, the 500kV busbar short-circuit Current calculation result of main website is as shown in table 2.
Table 2
In table, result is known, and the western 500kV of Shanghai looped network transformer station short circuit current is generally higher, and wherein 500kV busbar short-circuit electric current in Shanghai Seat high pressure station surpasses 63kA.All the other have also all surpassed 55kA.For controlling the short circuit current in this region, need to take rack to adjust measure, consider that Suzhou～Hu Xi has built up 1000kV double back, cross with Huang～Si Jing is overlapping in function, from trend result, cross～nasal mucus of Huang river rising in Ningxia and flowing into central Shaanxi circuit carries trend very light, and both sides short circuit current is all very high, the cross～nasal mucus river rising in Ningxia and flowing into central Shaanxi 500kV double loop of therefore can considering to untie Huang, after untiing, both sides short circuit current declines to a great extent, and western station, Shanghai 500kV side is down to 60.56kA, and all the other are substantially all down to below 50kA.
The 4th step carries out reaching a conclusion after simulating, verifying: necessity while separating inscription of loop, the opportunity of the cross～nasal mucus river rising in Ningxia and flowing into central Shaanxi double loop of untiing Huang must be after the western 1000kV engineering in Huainan～Nanjing～Taizhou～Suzhou～Shanghai be built up, once occur that District of Shanghai short circuit current exceeds standard, and just can untie.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. the 1000kV/500kV/220kV electromagnetic looped network choose opportunities method of unlinking, is characterized in that: said method comprising the steps of:
Step 1: determine electromagnetic looped network in short circuit current and trend transfer party in the face of electric network influencing;
Step 2: analyze the ability to transmit electricity constraint after fault of the electrical network that causes due to electromagnetic looped network;
Step 3: the impact before and after unlinking according to the principle contrast actual electric network of unlinking;
Step 4: judge whether electromagnetic looped network unlinks.
2. the 1000kV/500kV/220kV electromagnetic looped network according to claim 1 choose opportunities method of unlinking, is characterized in that: described step 1 comprises the following steps:
Step 1-1: determine the direct impact of electromagnetic looped network on extra-high voltage grid safety and stability aspect according to the service conditions of electrical network and operation characteristic;
Step 1-2: calculate by calculation of short-circuit current, trend calculating and stability, determine short circuit current, trend transfer characteristic and the transient stability characteristic of extra-high voltage grid.
3. the 1000kV/500kV/220kV electromagnetic looped network according to claim 2 choose opportunities method of unlinking, it is characterized in that: described service conditions comprises workload demand, trend trend, voltage, electric current and frequency, described operation characteristic comprise electrical network resist the ability of fault and fault before and after trend distribute.
4. the 1000kV/500kV/220kV electromagnetic looped network according to claim 1 choose opportunities method of unlinking, is characterized in that: described step 2 comprises the following steps:
Step 2-1: carry out trend simulation calculation according to operation characteristic, draw the tide flow size shifting on 500kV after 1000kV fault, 220kV circuit;
Step 2-2: according to whether there is the out-of-limit situation of trend after the steady limitation table failure judgement of circuit heat of actual measurement, carry out power system transient simulation calculating simultaneously and judge whether to cause the chain unstability fault of transient state;
Step 2-3: according to the steady restriction of electrical network heat after the arbitrary element fault of extra-high voltage grid and steady restriction temporarily, determine that electromagnetic looped network is for the constraint of electrical network cross sections ability to transmit electricity.
5. the 1000kV/500kV/220kV electromagnetic looped network according to claim 1 choose opportunities method of unlinking, it is characterized in that: in described step 3, according to the principle of unlinking, make a concrete analysis of judgement 1000/500kV electromagnetic looped network and the impact of 500/220kV electromagnetic looped network on system safety stability.
6. the 1000kV/500kV/220kV electromagnetic looped network according to claim 5 choose opportunities method of unlinking, is characterized in that: described in the principle of unlinking comprise:
A) open tri-grades of electromagnetic looped networks of 1000/500/220kV, guarantee after 1000kV, 500kV line fault, the unlikely 220kV electrical network generation cascading failure that causes;
B) consider the front this area power supply and load distributes, trend flows to, main transformer is made a bet power, safety and stability characteristic and power supply reliability of unlinking, and avoid power supply reliability reduction, the some areas of because of unlinking, causing to occur Voltage-stabilizing Problems;
C) after electromagnetic looped network unlinks, arbitrary circuit, main transformer or generator failure or fault-free disconnect, and meet power system safety and stability operation and do not cause other elements to surpass the requirement of regulation accident overload and voltage permissible variation.
7. the 1000kV/500kV/220kV electromagnetic looped network according to claim 1 choose opportunities method of unlinking, it is characterized in that: in described step 4, the Pros and Cons that unlinks and bring that compares electromagnetic looped network, according to the mains supply ability after unlinking, whether can meet the feasibility that the Location of requirement of electrical network unlinks, if meet, unlink.
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