CN107069747A - A kind of minimum start-up mode based on regional voltage stabilization determines method - Google Patents
A kind of minimum start-up mode based on regional voltage stabilization determines method Download PDFInfo
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- CN107069747A CN107069747A CN201710188624.4A CN201710188624A CN107069747A CN 107069747 A CN107069747 A CN 107069747A CN 201710188624 A CN201710188624 A CN 201710188624A CN 107069747 A CN107069747 A CN 107069747A
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- voltage
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- transient voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
Method is determined the invention discloses a kind of minimum start-up mode based on regional voltage stabilization.Current stabilization of power grids analysis method, the arrangement for instructing the actual electric network method of operation still suffers from regional Voltage Instability under catastrophe failure.The present invention is based on actual electric network running mode data, successively carry out quiescent voltage and Transient Voltage Stability is calculated, when being unsatisfactory for static or Transient Voltage Stability requirement, export voltage stabilization most weak spot in the whole network, and open the nearest generator of electrical distance between most weak spot, until meeting the requirement of static and Transient Voltage Stability simultaneously, it is to avoid collapse of voltage occurs for power network some areas under catastrophe failure.The method of the present invention is arranged available for the actual electric network method of operation, lifts electricity net safety stable level.
Description
Technical field
The present invention relates to power system voltage safety and stability field, it is specifically a kind of based on regional voltage stabilization most
Small start-up mode determines method, it is adaptable to the receiving end power network with voltage security hidden danger.
Background technology
Power system voltage stabilization problem is always the focus that work about electric power person and scholar are concerned about for a long time, is also domestic
The major reason of outer many large-scale blackouts.Under multi-infeed DC, receiving end power network " tetanic weak friendship " characteristic further shows, " big
By electric, small start " method of operation outstanding problem, the operation characteristic generation important change of power network, threat power system voltage safety
It is stable.Document one《Extensive extra-high voltage alternating current-direct current serial-parallel power grid specificity analysis is controlled with operation》(electric power network technique, 2016,40
(4)：985-991) point out that current extra-high voltage receiving end Network Voltage Stability enabling capabilities are not enough, the N-1 failures forever of 500kV circuits three,
There is Voltage Instability risk in Southern Zhejiang.
Current power system voltage is stable to be broadly divided into the static and major class of transient state two, both computational methods increasingly into
It is ripe.Document two《Zhejiang alternating current-direct current series-parallel connection receiving end power network static stability analysis》(electric power system protection and control, 2016,44 (15)：
164-170) describe actual electric network static voltage stability computational methods：Using increase partial electric grid load level, and pass through hair
Motor, which is exerted oneself, to be balanced, the stability limit of Step wise approximation area key sections.Document three《A kind of quantitative evaluation transient voltage is steady
Qualitatively index and method》(Electric Power Automation Equipment, 2015,35 (10)：151-156) describe that current electric grid used is temporary
State Voltage Stability Analysis method, mainly carries out quantitative evaluation according to the recovery situation of fault in ac transmission system Down Highway voltage.It is above-mentioned
Two kinds of analysis methods have respectively obtained extensive use, but still lack effective ways at present and be combined two kinds of appraisal procedures,
Arrangement for instructing the actual electric network method of operation, it is to avoid regional Voltage Instability under catastrophe failure.
The content of the invention
The technical problems to be solved by the invention are that the defect for overcoming above-mentioned prior art to exist is based on area there is provided one kind
The minimum start-up mode of voltage stabilization determines method, and it considers area power grid static state and Transient Voltage Stability characteristic simultaneously, makes reality
Minimum start-up mode requirement is at least up to during the operation of power networks of border, to avoid AC system catastrophe failure from causing regional collapse of voltage.
Therefore, the technical solution adopted by the present invention is as follows：A kind of minimum start-up mode based on regional voltage stabilization is determined
Method, its step includes：
The first step：According to the typical operation modes data of target grid, static voltage stability calculating is carried out, the whole network is obtained quiet
State voltage most weak spot and air extract, if air extract meets electricity net safety stable requirement, turn
To the 3rd step, second step is otherwise gone to；
Second step：The electrical distance between the quiescent voltage most weak spot that the whole network generator and the first step are obtained is calculated, is increased
Open with the nearest unit 1 of quiescent voltage most weak spot electrical distance, go to the first step re-start static voltage stability calculating；
3rd step：On the premise of air extract is met, carry out Transient Voltage Stability and calculate, obtain the whole network temporary
State voltage most weak spot and transient voltage recovery time；If Transient Voltage Stability nargin meets electricity net safety stable requirement, turn
To the 5th step；Otherwise the 4th step is gone to；
4th step：The electrical distance between the transient voltage most weak spot that the whole network generator and the 3rd step are obtained is calculated, is increased
Open with the nearest unit 1 of transient voltage most weak spot electrical distance, go to the 3rd step re-start Transient Voltage Stability calculating；
5th step：The power network start-up mode after calculating is exported, is to meet static state and Transient Voltage Stability requirement simultaneously
Minimum start-up mode.
Further, in the first step, air extract, which need to be met, is more than 10%, N-1 failure sides under normal mode
It is more than 5% under formula.
Further, in second step, assessed and sent out using the impedance value between generator node and quiescent voltage most weak spot
Motor is to the quiescent voltage enabling capabilities of most weak spot, and impedance value is smaller to show that electrical distance is nearer, passes through increase and Static Electro
The minimum unit of the impedance value between most weak spot is pressed to effectively improve steady stability nargin.
Further, in the 3rd step, Transient Voltage Stability nargin need to meet voltage after the permanent short trouble of three-phase and be less than
Recovery time after 0.8p.u. is less than 10s.
Further, in the 4th step, assessed and sent out using the impedance value between generator node and transient voltage most weak spot
Motor is to the transient voltage enabling capabilities of most weak spot, and impedance value is smaller to show that electrical distance is nearer, by increasing and transient state electricity
The minimum unit of the impedance value between most weak spot is pressed to effectively improve transient voltage regeneration rate.
Compared with prior art, the present invention has advantages below：
1. flow is simple, calculate quick, meet dispatching of power netwoks requirement, actual electric network method of operation peace can be efficiently applied to
Row.
2. mainly for the requirement of static and Transient Voltage Stability, actual electric network start-up mode adjustment is carried out, can be prevented effectively from
Power network unstability and large-scale blackout occur under catastrophe failure.
3. being ranked up using the impedance value between unit and weak spot, the voltage to weak spot after start can be effectively improved
Enabling capabilities, calculate convenient, mechanistic strong.
Brief description of the drawings
Fig. 1 is the FB(flow block) of the present invention；
Fig. 2 is the equivalent network figure between certain generator i and most weak spot；
Fig. 3 is using the Zhejiang power grid Ouhai Transient Voltage Stability result of calculation figure under the minimum start-up mode of the present invention.
Embodiment
With the continuous construction of UHV Transmission Engineering, AC-DC hybrid power grid operation characteristic is increasingly sophisticated.Direct current outside area
After Large Copacity feed-in, receiving end power network start scale progressively reduces, and voltage support characteristic constantly weakens.In the case, area is external
Electricity has replaced a large amount of local units, causes air extract to decline, transient voltage recovery capability weakens under failure, extremely
There is collapse of voltage under serious way may.
For these reasons, the present invention provides a kind of minimum start computational methods based on regional voltage stabilization, ensemble stream
Journey block diagram is as shown in Figure 1.The embodiment to the present invention is described in detail below in conjunction with the accompanying drawings.
The first step：According to the typical operation modes data of target grid, static voltage stability calculating is carried out.It is soft using PSSE
Part, increases target grid load level, and is balanced by generator output, the stability limit of Step wise approximation most weak spot,
Calculating obtains the whole network quiescent voltage most weak spot (i.e. the minimum node of voltage) and air extract.Static voltage stability is abundant
Spend KpaCalculation formula is as follows.
Kpa=(Pj-P0)/0× 100% (1)
In formula：P0Based on network load level, P under modejNetwork load level when being reached capacity for steady stability.
If air extract meets electricity net safety stable requirement, the 3rd step is gone to；Otherwise second step is gone to.Root
According to《DL/T-1234-2013 power system security stability Calculation fundamental norms》(Beijing：China Electric Power Publishing House, 2013), it is static
Voltage stability margin, which need to meet to be more than under 10%, N-1 failure modes under normal mode, is more than 5%.
Second step：The impedance value between the quiescent voltage most weak spot that the whole network generator and the first step are obtained is calculated, specifically
Method for solving can basis《Thevenin's equivalence parameter tracking computational methods based on time-domain-simulation》(Proceedings of the CSEE,
The 34th phase of volume 30 in 2010).
It can be obtained according to result of calculation, the equivalent network between certain generator i and most weak spot is as shown in Fig. 2 equivalence
Impedance is Zi, and generator terminal voltage is Ui.Electric current I will be provided for equivalent network after unit i starts shooting1, now equivalent impedance
The pressure drop of generation is：
UZi=I1*Zi (2)
According to thevenin equivalent circuit, the magnitude of voltage of most weak spot is U：
U=Ui-UZi=Ui-I1*i
It can be seen from above formula, when equivalent impedance is smaller, electrical distance between the two is nearer, and the pressure drop caused is smaller, this
When most weak spot magnitude of voltage U it is bigger.Therefore, it is the voltage stability of raising most weak spot, should preferentially opens equivalent impedance value
Smaller unit.
For these reasons, the unit 1 the impedance value minimum between quiescent voltage most weak spot is increased, first is gone to
Step re-starts static voltage stability calculating.
3rd step：On the premise of air extract is met, carry out Transient Voltage Stability and calculate.It is soft using BPA
Part, carries out the permanent short trouble N-2 emulation of three-phase, and protection act sequential is cut off by the cycle of failure near-end 4.5,5 cycles of distal end.
Power network feed-in direct current uses complete dynamic model, rectification side constant dc power control, and inverter side determines voltage control.Generator uses six
Winding model and actual measurement parameter, load use motor model.Each node voltage numerical value of the whole network after fault clearance is obtained, in the time
T posterior nodal point voltages recover to more than scleronomic constraint value, then t is transient voltage recovery time.The whole network transient state electricity is obtained according to calculating
Press most weak spot (i.e. the minimum node of voltage) and transient voltage recovery time.If it is steady that Transient Voltage Stability nargin meets power grid security
Provisioning request, then go to the 5th step；Otherwise the 4th step is gone to.According to《DL/T-1234-2013 power system security stability Calculation bases
This specification》(Beijing：China Electric Power Publishing House, 2013), Transient Voltage Stability nargin need to be met after the permanent short trouble of three-phase
Voltage is less than the recovery time after scleronomic constraint value 0.8p.u. less than 10s.
4th step：Calculate the impedance value between the transient voltage most weak spot that the whole network generator and the 3rd step are obtained, impedance
Value is smaller to show that electrical distance is nearer, increases the minimum unit 1 of impedance value between transient voltage most weak spot, goes to the
Three steps re-start Transient Voltage Stability calculating.
5th step：The power network start-up mode after calculating is exported, is to meet static state and Transient Voltage Stability requirement simultaneously
Minimum start-up mode.
Compliance test result：In order to test the validity of the method for the invention, Zhejiang actual electric network is carried out using the present invention
Simulating, verifying.
Carry out static voltage stability calculating for Zhejiang power grid certain typical operation modes, normal mode and catastrophe failure and
Accordingly result is as shown in table 1.
Certain typical way quiescent voltage result of calculation of the Zhejiang power grid of table 1
As can be known from Table 1, only lotus all~Ouhai N-1 under air extract be less than 5%, be unsatisfactory for relevant stable
It is required that.For the most weak spot Ouhai of the voltage under the failure, carry out generator and calculated with most weak spot electrical distance, obtain impedance
The minimum generator of value is Leqing Power Plant.1 machine of Leqing power plant is increased on this basis, and it is quiet to re-start Zhejiang power grid
State voltage stabilization result of calculation is as shown in table 2.
The Zhejiang power grid of table 2 minimum start-up mode quiescent voltage result of calculation
As can be known from Table 2, air extract requirement is met under the current method of operation.Carry out in this mode temporary
State voltage is calculated, and most weak spot is Ouhai, and transient voltage result is as shown in Figure 3.
From the figure 3, it may be seen that recovery time of the transient voltage less than 0.8p.u. is less than 10s, relevant stable requirement is met.Therefore,
Which is while meeting the minimum start-up mode of static and Transient Voltage Stability requirement.
The basic principles, principal features and advantages of the present invention have been shown and described above.Those skilled in the art should
Understand, the present invention do not limited by above-mentioned specific embodiment, the description in above-mentioned specific embodiment and specification be intended merely into
One step illustrate the present invention principle, without departing from the spirit and scope of the present invention, the present invention also have various change and
Improve, these changes and improvements all fall within the protetion scope of the claimed invention.The scope of protection of present invention will by right
Ask book and its equivalent thereof.
Claims (5)
1. a kind of minimum start-up mode based on regional voltage stabilization determines method, its step includes：
The first step：According to the typical operation modes data of target grid, static voltage stability calculating is carried out, the whole network Static Electro is obtained
Most weak spot and air extract are pressed, if air extract meets electricity net safety stable requirement, the is gone to
Three steps, otherwise go to second step；
Second step：Calculate the electrical distance between the quiescent voltage most weak spot that the whole network generator and the first step are obtained, increase with
The nearest unit of quiescent voltage most weak spot electrical distance 1, goes to the first step and re-starts static voltage stability calculating；
3rd step：On the premise of air extract is met, carry out Transient Voltage Stability and calculate, obtain the whole network transient state electricity
Press most weak spot and transient voltage recovery time；If Transient Voltage Stability nargin meets electricity net safety stable requirement, is gone to
Five steps；Otherwise the 4th step is gone to；
4th step：Calculate the electrical distance between the transient voltage most weak spot that the whole network generator and the 3rd step are obtained, increase with
The nearest unit of transient voltage most weak spot electrical distance 1, goes to the 3rd step and re-starts Transient Voltage Stability calculating；
5th step：Power network start-up mode after output calculating, is to meet the static minimum with Transient Voltage Stability requirement simultaneously
Start-up mode.
2. the minimum start-up mode according to claim 1 based on regional voltage stabilization determines method, it is characterised in that the
In one step, air extract, which need to meet to be more than under 10%, N-1 failure modes under normal mode, is more than 5%.
3. the minimum start-up mode according to claim 1 based on regional voltage stabilization determines method, it is characterised in that the
In two steps, static state of the generator to most weak spot is assessed using the impedance value between generator node and quiescent voltage most weak spot
Voltage support ability, impedance value is smaller to show that electrical distance is nearer, by increasing the impedance between quiescent voltage most weak spot
Value minimum unit effectively improves steady stability nargin.
4. the minimum start-up mode according to claim 1 based on regional voltage stabilization determines method, it is characterised in that the
In three steps, Transient Voltage Stability nargin need to meet voltage after the permanent short trouble of three-phase and be less than the recovery time after 0.8p.u.
Less than 10s.
5. the minimum start-up mode according to claim 1 based on regional voltage stabilization determines method, it is characterised in that the
In four steps, transient state of the generator to most weak spot is assessed using the impedance value between generator node and transient voltage most weak spot
Voltage support ability, impedance value is smaller to show that electrical distance is nearer, by increasing the impedance between transient voltage most weak spot
Value minimum unit effectively improves transient voltage regeneration rate.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785889A (en) * | 2017-10-18 | 2018-03-09 | 中国电力科学研究院有限公司 | A kind of minimum start optimization method of weak receiving end power network for supporting high-capacity direct current feed-in |
| CN109088427A (en) * | 2018-07-23 | 2018-12-25 | 国网青海省电力公司经济技术研究院 | Conventional power unit minimum booting scheme determines method and system in a kind of AC-DC hybrid power grid |
| CN109301880A (en) * | 2018-11-09 | 2019-02-01 | 国网宁夏电力有限公司 | Method, apparatus and system are determined based on the direct current near region minimum booting of unit static state and dynamic electric voltage support effect |
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| CN105119267A (en) * | 2015-07-08 | 2015-12-02 | 国家电网公司 | Static voltage stable level analyzing method for power grid |
| CN105610171A (en) * | 2016-02-24 | 2016-05-25 | 国家电网公司 | Unit load dynamic reactive response based minimum boot order optimization method |
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| CN103269079A (en) * | 2013-03-11 | 2013-08-28 | 中国电力科学研究院 | Reactive compensation configuration method based on static and transient voltage stability constraint |
| CN105119267A (en) * | 2015-07-08 | 2015-12-02 | 国家电网公司 | Static voltage stable level analyzing method for power grid |
| CN105610171A (en) * | 2016-02-24 | 2016-05-25 | 国家电网公司 | Unit load dynamic reactive response based minimum boot order optimization method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107785889A (en) * | 2017-10-18 | 2018-03-09 | 中国电力科学研究院有限公司 | A kind of minimum start optimization method of weak receiving end power network for supporting high-capacity direct current feed-in |
| CN109088427A (en) * | 2018-07-23 | 2018-12-25 | 国网青海省电力公司经济技术研究院 | Conventional power unit minimum booting scheme determines method and system in a kind of AC-DC hybrid power grid |
| CN109088427B (en) * | 2018-07-23 | 2023-06-27 | 国网青海省电力公司经济技术研究院 | Method and system for determining minimum starting-up scheme of conventional unit in AC/DC hybrid power grid |
| CN109301880A (en) * | 2018-11-09 | 2019-02-01 | 国网宁夏电力有限公司 | Method, apparatus and system are determined based on the direct current near region minimum booting of unit static state and dynamic electric voltage support effect |
| CN109301880B (en) * | 2018-11-09 | 2021-06-01 | 国网宁夏电力有限公司 | Method, device and system for determining minimum startup of direct current near zone |
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