CN1162697A - Combined hydro-generators of hydroelectric stations - Google Patents
Combined hydro-generators of hydroelectric stations Download PDFInfo
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- CN1162697A CN1162697A CN97100485A CN97100485A CN1162697A CN 1162697 A CN1162697 A CN 1162697A CN 97100485 A CN97100485 A CN 97100485A CN 97100485 A CN97100485 A CN 97100485A CN 1162697 A CN1162697 A CN 1162697A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
A combined hydrogenerator set for hydraulic power station is composed of at least two hydrogenerator sets. The first set is suitable for permanent running with water head range from minimum to maximum and high single-machine output from designed to maximal water heads. The second set is suitable for running in the water head range from minimum to one between designed and maximal water heads with maximal unit flow greater than that of the first set. The number of machines for the first set must meet the capacity requirement when the first set runs only. Its advantages are high electric capacity and benefit of hydraulic power station in flood period and the period when nl hydrogenerator set runs only.
Description
The present invention relates to a kind of combination water turbine generator group of hydroelectric power plant, it can be used to the water power plant provides adjustable combination water turbine generator group of exerting oneself, and is applicable to bigger year of seasonal head excursion to regulate the water power plant.
The reservoir capacity in the water power plant of moving at present is all less, can not carry out the perfect year to discharge of river (year water yield) regulates, will abandon water flood duration (low water head phase) in a large number, super holding when avoiding the reservoir flow greater than the discharge capacity of the whole water turbine in water power plant, this potential ability that just certainly will cause the water power plant to increase generated energy in flood duration can not be not fully exerted.
Prior art is that all different hydraulic generator unit of water turbine series, specific speed and size is installed on the water power plant, and on each this class water power plant of seat, all water turbine all move in same design head scope.Its deficiency is: will abandon water in a large number flood duration, and the potential ability that causes the water power plant to increase generated energy in flood duration can not be not fully exerted.
The objective of the invention is to overcome above-mentioned deficiency of the prior art and provide a kind of can be efficiently and make full use of waterpower (head) resource, increase the combination water turbine generator group of the hydroelectric power plant of water power plant generated energy and benefit.
Purpose of the present invention can reach by following measure: the present invention is made up of two groups of hydraulic generator units at least, the water turbine of this at least two groups unit be adjustable exert oneself and parameter different, the water turbine of first group of hydraulic generator unit is applicable to permanent runtime or frequent runtime, the head scope strengthens the unit power output operation in from design head to the maximum head scope from the minimum value to the maximum value.The water turbine of second group of hydraulic generator unit is applicable in the head scope from the minimum head to the design head and between the maximum head and moves, its maximum unit flow is greater than first group of water turbine, first group of hydraulic turbine generator organize a performance several selected must consider to have only first group of hydraulic generator unit operation the time water power plant to the requirement of exerting oneself under each operating head polishing.This section discuss and following the argumentation in, exert oneself and specific discharge is all considered by maximum value.
The drawing of accompanying drawing is described as follows:
Fig. 1 is the schematic representation of the water turbine of first group and second group hydraulic generator unit of the present invention;
Fig. 2 is the water turbine unit power output and the head relation curve in the present invention and " Three Gorges " water power plant in the present embodiment.
The invention will be further described below in conjunction with embodiment and accompanying drawing:
The main raw data that must have before implementing the present invention is as follows: the maximum head H in water power plant
Max, design head H
P, minimum head H
Min, electric motor power and the total platform of installation count n etc.
According to above-mentioned raw data, the present invention is made up of two groups of hydraulic generator units at least, the water turbine of this at least two groups unit be adjustable exert oneself and parameter different, the water turbine of first group of hydraulic generator unit is applicable to permanent runtime or frequent runtime, the head scope is from minimum value H
MinTo maximum value H
Max, from design head H
PTo maximum head H
MaxStrengthen the unit power output operation in the scope; The water turbine of second group of hydraulic generator unit is applicable to from minimum head H
MinTo design head H
PWith maximum head H
MaxBetween middle head H
NPOperation in the scope, its maximum unit flow Q '
1max2Greater than first group of water turbine.First group of hydraulic turbine generator several n that organize a performance
1Selected must consider to have only first group of hydraulic generator unit operation the time water power plant to the requirement of exerting oneself under each operating head polishing.
Second group of hydraulic generator unit do not move in the maximum head scope at the middle head of appointment.But, since first group of water turbine at head greater than design head H
PShi Jiada exert oneself, therefore, can guarantee that first group exert oneself is not less than only to adopt first group of water turbine not strengthening following exerting oneself of reaching of the situation of exerting oneself.At this moment, the possible minimum platform number of first group of hydraulic generator unit is:
n
1＝N
P/N
max·n
In the formula: N
PThe design unit power output of-water turbine under design head;
N
MaxThe maximum unit power output of-water turbine under maximum head;
N=(n
1+ n
2The total platform number of the hydraulic generator unit in)-water power plant.
If the installation the when installation of water turbine is exerted oneself less than design head when requiring maximum head is exerted oneself, then the possible minimum platform number of hydraulic generator unit is:
n
1＝N
P/N
max·N-B/N
max
In the formula: the permission difference (providing) that the installation of B-water power plant water turbine under design head and maximum head is exerted oneself by the user.
In the case, first group of hydraulic turbine generator organized a performance to count and also can be reduced.Keeping under the constant situation of the total platform number of water power plant hydraulic generator unit, the platform of second group of hydraulic generator unit is counted n
2Can correspondingly increase.The N of first group of water turbine
P/ N
MaxThe excursion of ratio on different water power plants be N
P/ N
Max=0.99-0.8.First group of water turbine maximum unit power output when maximum head strengthens, because specific discharge Q '
1Strengthen etc., the efficient of water turbine generally also can improve.
According to essence of the present invention, because second group of bigger water turbine of specific discharge arranged, in comprising the head scope of head flood duration, can improve the gross capability of second group of hydraulic generator unit, thereby make the gross capability of the hydraulic generator unit of whole combination be higher than the gross capability of the hydraulic generator unit that first group of water turbine only is installed.
Because flood duration, water turbine is with the maximum possible operation of exerting oneself, so, second group of water turbine maximum output flood duration add the generated energy increase that senior general makes the water power plant.Why the generated energy in water power plant can increase is to abandon water owing to having reduced.
Second group of water turbine maximum unit flow Q '
1max2With first group of water turbine maximum unit flow Q '
1max1In different water power plants is different, and its excursion is Q '
1max2/ Q '
1max1=1.01-1.2.
Embodiment is the People's Republic of China (PRC) " Three Gorges " water power plant.Selected 26 Francis turbine P0115 of identical parameters for use, its parameter is as follows: runner diameter D
1=9.87m, rotation speed n=75 rev/min, N exerts oneself
P=710MW, the head scope in the permanent runtime designs (calculating) head H from Hmin=71m to Hmax=113m
P=80.6m.The N-H relation curve of water turbine is shown in Fig. 2 center line 1.Draw from the P0115 water turbine complete performance that is applicable to 115 meters of maximum heads: at maximum possible specific discharge 1.18m
3During/s, can guarantee that sending 710MW exerts oneself; When 113 meters of maximum heads, specific discharge 0.66m
3/ s.Can guarantee that sending 710MW exerts oneself, this flow is significantly less than the maximum possible specific discharge 1.16m under this head
3/ s.Simultaneously, minimum head 71m and under this head maximum unit flow 1.18m
3During/s, can only guarantee that sending 580MW exerts oneself.Therefore, arrive H at Hmin
PIn the scope, can not improve and exert oneself; And at H
PIn the Hmax scope, also can not increase and exert oneself.
According to the present invention, adopt two groups of hydraulic generator unit n
1And n
2(see figure 1).First group of hydraulic generator unit n
1Adopt the P0115 water turbine, consider and to improve H
PSpecific discharge in the-Hmax scope, the 880MW (seeing Fig. 2 line 2) when in design, this water turbine exerting oneself in above-mentioned head scope being brought up to maximum head Hmax.Second group of hydraulic generator unit n
2Employing is applicable to that maximum head is 90 meters a P090 water turbine, its runner diameter D
1Identical with rotation speed n with the P0115 water turbine, but its working head expanded range is to from Hmin to H
PAnd a certain middle head H between the Hmax
Np, be 86 meters in the present embodiment.In the ordinary course of things, H
NpSatisfying under the following condition, adopting may minimum value, and promptly the operating head polishing scope of the second unit water turbine can comprise whole flood duration of head scope.At this moment, the P090 water turbine should be by in Hmin arrives the whole head scope of Hnp, with maximum unit flow 1.224m
3The design of/s operating conditions, it is exerted oneself when Hmin is 620MW, at H
pThe time be 765MW, at H
NpThe time be 800MW (referring to Fig. 2 center line 3).
The platform of hydraulic generator unit is counted n
1And n
2Selected by following method: as previously mentioned, n
1The value added of the unit power output of group hydraulic generator unit when Hmax is 880-710=170MW, accounts for 20% of unit power output.Therefore, the platform of first group of hydraulic generator unit is counted n
1For deduct 20% at least from the total platform number in water power plant, that remaining then is the platform number of second group of hydraulic generator unit, i.e. n
1=N
P/ N
Max* n=710/880 * 26 ≌ 21, n
2=n-n
1=26-21=5.
Owing to adopt the present invention, and the hydraulic generator unit is made up by described compound mode, under normal running (operation) conditions (being the permanent runtime), can guarantee that head (contains flood duration and water power plant retaining phase head scope) in 71 meters to 86 meters low water head scope gross capability increases substantially.Therefore, at this run duration, abandon water owing to reduced, the generated energy in water power plant will increase.
The contrast of the gross capability that following table has been listed the combination water turbine generator group that the present invention recommends fully aware ofly and 26 that intend in the past adopting same water wheels unit gross capabilities.
The hydraulic generator unit the present invention of table 1 " Three Gorges " power station and existing scheme are in phase
Answer the contrast of exerting oneself under the head
| Head | Gross capability MW (megawatt) | |
| M (rice) | 5 in 21 second group of water turbine of first group of water turbine of the present invention | 26 in existing scheme identical parameters water turbine |
| 113 | 880×21＝18480 | 710×26＝18460 |
| 86 | (730×21)+(800×5)＝19330 | 710×26＝18460 |
| 80.6 | (710×21)+(765×5)＝18735 | 710×26＝18460 |
| 71 | (580×21)+(620×5)＝15280 | 580×26＝15080 |
Can find out also that from table 1 the combination water turbine generator prescription case of recommendation not only can increase exerts oneself, and also can improve the average operating efficiency of water turbine.n
1Group is owing to strengthened H
P-H
MaxSpecific discharge during head; n
2Group is because the optimum unit speed of P090 water turbine is higher.
All these can improve greatly the water power plant the permanent runtime (promptly from minimum head H
MinTo maximum head H
Max) generated energy under design parameter.
In the flood runtime, the installation of water turbine of the present invention is exerted oneself increase 18735/18460=1.015 (seeing Table 1), promptly increases by 1.5%.Because the flood runtime accounts for 30% of total runtime in water power plant year, as with regard to the annual electricity generating capacity in water power plant, then annual electricity generating capacity increases by 1.5 * 0.3=0.5% (press B=0 calculating) to the major general.When B＞0, first group of hydraulic turbine generator number of organizing a performance can reduce, and second group of hydraulic turbine generator organized a performance and severally then can be increased, thereby can increase generated energy owing to second group of hydraulic generator unit.
Because the unit power output when having improved maximum head, the efficient of first group of water turbine can improve 3%.The year runtime of water power plant under high head accounts for 30% of year total runtime, and therefore, the average operating efficiency in water power plant can improve 3 * 0.3=0.9%.
The gross value added of water power plant generated energy will be not less than 0.5+0.9=1.4%.As 26 water turbine that parameter is identical are installed, the design year generated energy in water power plant is 847 * 10 on " Three Gorges " water power plant
8Kilowatt hour.
As adopt to increase generated energy 847 * 10 every year of the present invention
8* 0.014=11.8 * 10
8Kilowatt hour, as by 0.025 dollar of every kilowatt hour electricity price, then the water power plant can increase profit 11.8 * 0.025=29.8 * 10 every year
6Dollar.
The maximum output of water turbine is brought up to 880 megawatts, and the price of hydraulic generator unit will improve 8%.The price that if exert oneself is the hydraulic generator unit of 710 megawatt water turbine is 60 * 10
6Dollar, then owing to the expense that adopts the present invention to increase is 60 * 10
6* 26 * 0.08=124.8 * 10
6Dollar.Consider that the water power plant has increased generated energy in the permanent runtime, above-mentioned expense can be 124.8 * 10
6/ 29.8 * 10
6Compensate for in=4.2 years.
Be 10-250 rice, abandon water phase length, big, the more relatively water power plant of hydraulic generator unit design platform number of head luffing for maximum head, adopt effect of the present invention best.
The present invention contrasts prior art and has following superiority:
The present invention has only n in the time of can increasing generated energy, the benefit that improves flood runtime water power plant and maximum head
1Benefit during the operation of platform hydraulic generator unit.For maximum head be 10-250 rice, abandon the water phase long, the head luffing big and the more relatively water power plant of hydraulic generator unit design platform number, adopts effect of the present invention best.
Claims (3)
1. the combination water turbine generator group in a water power plant, at least form by two groups of hydraulic generator units, the water turbine of this at least two groups unit be adjustable exert oneself and parameter different, it is characterized in that, the water turbine of first group of hydraulic generator unit is applicable to the permanent runtime, the head scope is from the minimum value to the maximum value, strengthen the unit power output operation in from design head to the maximum head scope, the water turbine of second group of hydraulic generator unit is applicable in the head scope from the minimum head to the design head and between the maximum head and moves, its maximum unit flow is greater than first group of water turbine, first group of hydraulic turbine generator organize a performance several selected must consider to have only first group of hydraulic generator unit operation the time water power plant to the requirement of exerting oneself under each operating head polishing.
2. the combination water turbine generator group of hydroelectric power plant according to claim 1 is characterized in that, the platform number of first group of hydraulic generator unit is a minimum possible value, determines that by the difference of two numerical value first numerical value equals N
P/ N
MaxMultiply by the water power plant general assembly board number that is adopted, second numerical value equals water turbine installation under design head and the maximum head and exerts oneself and allow the ratio of maximum unit power output under difference and the first group of maximum head that water turbine adopted.
3. the combination water turbine generator group of hydroelectric power plant according to claim 1, it is characterized in that, second group of hydraulic turbine generator number of organizing a performance is the maximum possible value, and it is definite to press the minimum difference that may the platform number of the total platform number of water power plant hydraulic generator unit that adopted and first group of hydraulic generator unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100485A CN1162697A (en) | 1997-02-04 | 1997-02-04 | Combined hydro-generators of hydroelectric stations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100485A CN1162697A (en) | 1997-02-04 | 1997-02-04 | Combined hydro-generators of hydroelectric stations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1162697A true CN1162697A (en) | 1997-10-22 |
Family
ID=5165086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97100485A Pending CN1162697A (en) | 1997-02-04 | 1997-02-04 | Combined hydro-generators of hydroelectric stations |
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| Country | Link |
|---|---|
| CN (1) | CN1162697A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599101B (en) * | 2009-06-30 | 2011-08-10 | 上海电气电站设备有限公司 | Calculation method for water flow quantity of branch paths of generator rotor winding |
| CN108193653A (en) * | 2018-01-16 | 2018-06-22 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's Automatic Optimal system |
| CN108223258A (en) * | 2018-01-16 | 2018-06-29 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's automatic optimization method |
| CN108252276A (en) * | 2018-02-09 | 2018-07-06 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's automatic optimization method based on adjusting of contributing |
-
1997
- 1997-02-04 CN CN97100485A patent/CN1162697A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599101B (en) * | 2009-06-30 | 2011-08-10 | 上海电气电站设备有限公司 | Calculation method for water flow quantity of branch paths of generator rotor winding |
| CN108193653A (en) * | 2018-01-16 | 2018-06-22 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's Automatic Optimal system |
| CN108223258A (en) * | 2018-01-16 | 2018-06-29 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's automatic optimization method |
| CN108223258B (en) * | 2018-01-16 | 2023-12-15 | 衢州市信安水电开发有限公司 | Automatic optimization method for radial flow hydropower station |
| CN108193653B (en) * | 2018-01-16 | 2024-03-19 | 郑州誉善贸易有限公司 | Automatic optimizing system of radial-flow hydropower station |
| CN108252276A (en) * | 2018-02-09 | 2018-07-06 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's automatic optimization method based on adjusting of contributing |
| CN108252276B (en) * | 2018-02-09 | 2019-10-29 | 河南创辉水利水电工程有限公司 | A kind of plant without storage's automatic optimization method adjusted based on power output |
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