CN104967144A - Small hydropower station voltage regulation control method - Google Patents
Small hydropower station voltage regulation control method Download PDFInfo
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- CN104967144A CN104967144A CN201510353340.7A CN201510353340A CN104967144A CN 104967144 A CN104967144 A CN 104967144A CN 201510353340 A CN201510353340 A CN 201510353340A CN 104967144 A CN104967144 A CN 104967144A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention relates to a small hydropower station voltage regulation control method, which comprises steps: power flow calculation is carried out on a regional power grid containing small hydropower stations, and a voltage of each load node after access of the small hydropower stations is determined; in power grid operation, according to output, load and transmission line voltage conditions of each small hydropower station, as for a transmission line with load and small hydropower station installation comparable and with a voltage problem, the line power supply and the load position of the power grid are changed for one-time voltage regulation, wherein the step of one-time voltage regulation comprises substeps: one section or several sections of feeder lines is newly built for grid connection, the feeder line sections are used for changing the position where the small hydropower station in the regional power grid containing small hydropower stations is accessed to the power grid, and thus the voltage of the load node after the small hydropower station is accessed is controlled to be in a stable range. The prior small hydropower station network topology does not need to be changed greatly, a small section of line only needs to be changed or newly built, corresponding switching control is matched, the voltage exceeding phenomenon in the case of disorderly small hydropower station grid connection can be effectively controlled, excessively large line loss can be avoided, and access of the small hydropower stations to grid voltage can be flexibly controlled.
Description
Technical field
The present invention relates to electric power project engineering field, particularly relate to a kind of small power station Regulation Control method.
Background technology
Small power station is divided into radial-flow type (without storage capacity) and water storage type (having certain little storage capacity) by type, is main mainly with radial-flow type.Small power station is built in mountain area more, builds canal along mountain, utilizes water-head to generate electricity, and becomes T nearby by boosting and be connected to transmission line.
At present, 110kV or the 35kV transformer station in mountain area is few, and 10kV outlet circuit is long, and supply district is wide, and institute's on-load is main mainly with hillman load, and what small power station accessed is generally 10kV circuit.Therefore, when wet season small power station is sent out greatly, unordered grid-connected due to small power station, easily causes transmission line voltage lifting along the line, causes Over High-Limit Voltage; When dry season small power station does not exert oneself, because circuit is long, line voltage distribution is caused to get over lower limit.Transmission line frequently occurs Over High-Limit Voltage and more lower limit two is extreme, causes extreme influence to the normal life of subjective reflection.In addition, the long loss of circuit is large, and the effective electricity volume of small power station is few, also compromises the economic benefit of power grid enterprises.
Comprehensive, for the situation that load on transmission line is installed much smaller than small power station, progressively transfer load small power station's Internet access via leased-line can be formed; For the situation that load is installed much larger than small power station, generally there will not be voltage problem; But install comparable for load and small power station, and there is the transmission line of voltage problem, due to mountain area supply line head and unordered grid-connected the brought voltage problem of small power station and line loss problem, it is the common issue that small hydropower resources enriches area and faces, be directly connected to the social people's livelihood and economic benefit, then must need to carry out regulating and controlling voltage.
Summary of the invention
Based on this, be necessary the unordered grid-connected problem easily causing transmission line variation in voltage for small power station, provide a kind of can small power station's Regulation Control method of flexible.
A kind of small power station Regulation Control method, comprising:
Load flow calculation is carried out to the regional power grid containing small power station, determines the voltage of small power station's access each load bus rear;
In operation of power networks, according to the exerting oneself of each small power station, load and transmission line voltage condition, install comparable for load and small power station and there is the transmission line of voltage problem, changing the line power of electrical network and load position to carry out a pressure regulation;
A described pressure regulation comprises: one or more snippets feeder line section newly-built is carried out grid-connected, and utilize described feeder line section to change the position of the small power station's access electrical network containing the regional power grid of small power station, after the access of control small power station, the voltage of described load bus is in stability range.
Above-mentioned small power station Regulation Control method, by carrying out Load flow calculation to the regional power grid containing small power station, install comparable for load and small power station and there is the transmission line of voltage problem, one or more snippets feeder line section newly-built is carried out grid-connected, utilize described feeder line section to change the position of the small power station's access electrical network containing the regional power grid of small power station, after the access of control small power station, the voltage of described load bus is in stability range; Without the need to significantly changing existing small power station network topology, only need transformation or newly-built a bit of circuit, coordinate corresponding switching to control, effectively control the unordered grid-connected voltage out-of-limit phenomenon of small power station, avoid line loss excessive, achieve the flexible control to small power station's access line voltage.
Accompanying drawing explanation
Fig. 1 is the topological diagram of small power station provided by the invention Regulation Control Solution Embodiments;
Fig. 2 is the equivalent schematic diagram being rich in small power station's regional power grid of an embodiment;
Fig. 3 is rich in the topological structure schematic diagram of small power station's regional power grid based on small power station's flexible access pressure regulation;
Fig. 4 is for regulating each load bus change in voltage comparing result schematic diagram in front and back.
Embodiment
Set forth below in conjunction with the embodiment of accompanying drawing to small power station of the present invention Regulation Control method.
Small power station provided by the invention Regulation Control method, it is a kind of running technology scheme belonging to power engineering distribution network system, main under the unordered networking mode of small power station, for the flexible Regulation Control technology of voltage, under the prerequisite of basic maintenance existing small power station network topology, by transformation or newly-built a bit of circuit, solve small power station unordered grid-connected time the voltage out-of-limit that brings and the excessive problem of transmission line loss.
Technical scheme of the present invention, can be applied in the power distribution network of various electric pressure, particularly install comparable for load and small power station, and there is the 10kV transmission line of voltage problem, the 10kV feeder line that as numerous in small power station and rural area circuit is grown very much, adopt the flexible control technology of the present invention to carry out regulating and controlling voltage, can extraordinary effect be obtained.
Small power station provided by the invention Regulation Control method, comprises following process:
(1) Load flow calculation is carried out to the regional power grid containing small power station, determine the voltage of small power station's access each load bus rear;
In this step, first according to controlling Grid, the regional power grid containing small power station to be delimited, then carry out trend and carry out, calculate the voltage condition determining small power station's access each load bus rear.
(2) in operation of power networks, according to the exerting oneself of each small power station, load and transmission line voltage condition, install comparable for load and small power station and there is the transmission line of voltage problem, changing the line power of electrical network and load position to carry out a pressure regulation;
A described pressure regulation comprises: one or more snippets feeder line section newly-built is carried out grid-connected, and utilize described feeder line section to change the position of the small power station's access electrical network containing the regional power grid of small power station, after the access of control small power station, the voltage of described load bus is in stability range.
In one embodiment, small power station of the present invention Regulation Control method, if after a described pressure regulation, the voltage of described load bus still continues out-of-limit, then increase reactive-load compensation equipment at described load bus, and by carrying out switching control to reactive-load compensation equipment, secondary pressure regulation is carried out to load bus; Wherein, described reactive-load compensation equipment can comprise distributed electrical perhaps distributed electrical resist.
As a specific embodiment of small power station of the present invention Regulation Control method, can control as follows:
In the wet season, when user is in underload period and power supply survey voltage is higher, utilize newly-built feeder line section, and by carrying out orderly switching to the switch be arranged in feeder line section, be not less than under safe range at terminal temperature difference voltage, the small hydropower station of end is caused on front side of transmission line, controls the output voltage of small power station, by user's voltage control of front side, middle side in stability range.
As another specific embodiment of small power station of the present invention Regulation Control method, in the non-wet season, when user is in high load capacity period, utilize newly-built feeder line section, and by carrying out orderly switching to the switch be arranged in feeder line section, the small hydropower station of exerting oneself in leading portion, stage casing is caused side, transmission line end, compensate falling of last side user's voltage, control user's voltage in stability range.
In the above-described embodiments, further, can also the transmission line end side small power station of exerting oneself in setting range be caused on front side of transmission line, compensate user's Voltage Drop of nearby users, control the utilization voltage of whole piece feeder line user in stability range.
Shown in figure 1, Fig. 1 is the topological diagram of small power station provided by the invention Regulation Control Solution Embodiments, in figure, M is transmission line, L is electricity consumption user, N is load bus, HG is small power station, as seen from the figure, by according to the exerting oneself of each small power station, load and line voltage distribution situation, the synchronizing mode of flexible selection small power station, utilizes one section of newly-built feeder line M0 and original transmission line M0 or newly-built feeder line section to carry out grid-connected, changes source/lotus position by the change of network topology, reach the object changing trend, complete a pressure regulation strategy; When a pressure regulation be not enough to solve completely voltage keeps out-of-limit, controlled by the switching of reactive apparatus (distributed capacitor/distributed reactance), complete secondary pressure regulation strategy.Utilize a pressure regulation, change primary network topology, can to a certain extent voltage fluctuation be suppressed in the reasonable scope, realize pressure regulation target, on this basis, secondary pressure regulation is then the standby of a pressure regulation and supplements, can by user's voltage control in more stability range.
Shown in figure 2, Fig. 2 is the equivalent schematic diagram being rich in small power station's regional power grid of an embodiment; In figure, N1 ~ N11 is load bus, and HG1 ~ HG8 is small power station, and Z waits lower impedance, and other is corresponding equivalent parameters; As seen from the figure, this regional power grid comprises 11 equivalent load nodes and 8 small hydropower station nodes.
Suppose to carry out Load flow calculation to being rich in small power station's regional power grid shown in Fig. 2, Calculation results is as shown in table 1.Small power station's access has considerable influence to the voltage of N1-N11 load bus in Fig. 2, and make sub-load node voltage lower than 0.95p.u., sub-load node voltage is higher than 1.05p.u.
The impact of table 1. small power station access on load bus voltage
At this, technical scheme provided by the invention can being utilized, by being rich in the grid-connected position of the part small power station in small power station's regional power grid shown in adjustment Fig. 2, just effectively can adjust each out-of-limit load bus voltage to reasonable voltage range of operation.
Shown in figure 3, Fig. 3 is rich in the topological structure schematic diagram of small power station's regional power grid based on small power station's flexible access pressure regulation; According to the exerting oneself of each small power station, load and line voltage distribution situation, when load being existed to the transmission line of voltage problem, newly-built one section or multistage 10kV part of path can be adopted to carry out the formula of grid-connected side, as shown in phantom in FIG., source/lotus position is changed by the change of network topology, reach the object changing trend, complete a pressure regulation strategy; If when a pressure regulation be not enough to solve completely voltage keeps out-of-limit, can consider to increase reactive apparatus, and the switching carrying out equipment controls, and completes secondary pressure regulation strategy.
Specifically carrying out Adjusted Option can be as follows:
For the wet season, be in the small power station of the feeder line back segment of transmission line due to energy output abundance, small hydropower station needs to grid side power output, and when user is in underload period and power supply survey voltage higher time, power supply is surveyed power supply and is namely ensured that the voltage of line end user is in stability range, due to higher the closer to mains side voltage, when mains side and small power station are powered jointly, before easily causing circuit, user's voltage over standard of middle side, even burn household electricity equipment, therefore newly-built feeder line section can be utilized, by the orderly switching of switch, be not less than premised under safe range by terminal temperature difference voltage, the small hydropower station of end is caused on front side of circuit, utilize line power (relative to small power station's capacity, can Approximate Equivalent in ideal source) voltage clamp effect, control the output voltage of small power station, stable front side, the voltage of middle side user, as shown in Figure 3, small power station HG4 is caused N2 from N5, HG5, HG6 causes between Z10 and Z11 from N6.
For the wet season, because the water yield is little, part small power station energy output is not enough, and have part small power station owing to there being water storage function, power supply still can be provided to export, and when user is in high load capacity period, the user of side, circuit end easily causes the user's voltage near small hydropower station to reduce further, even lower than the starting resistor of household electricity equipment under power supply surveys power supply and small hydropower station acts on simultaneously; Newly-built feeder line section can be utilized, by the orderly switching of switch, the small hydropower station of exerting oneself in leading portion, stage casing is caused side, circuit end, as shown in Figure 3, small power station HG8 is caused N11 from N9, compensate falling of last side user's voltage; Further, the small power station that side, transmission line end cannot provide abundance to exert oneself can also be caused front side, avoid bringing larger Voltage Drop to nearby users, the stable of the utilization voltage of whole piece feeder line user can be ensured to greatest extent.
Comparison diagram 2 and Fig. 3 known, by the grid-connected position of 4 small power stations such as G8, G4, G5 and G6 in adjustment Fig. 2, can the node voltage of N4, N5, N6, N7, N10 and N11 in table 1 be adjusted in rational voltage range of operation; Each load bus voltage behind the grid-connected position of adjustment portion small power station, as shown in table 2.
Each load bus voltage behind table 2. adjustment member small power station on-position
| Load | N1 | N2 | N3 | N4 | N5 | N6 | N7 | N8 | N9 | N10 | N11 |
| Node | |||||||||||
| Voltage | 1.024 | 1.04 | 1.045 | 1.036 | 1.034 | 1.038 | 1.037 | 0.976 | 0.9621 | 0.9604 | 0.9695 |
Shown in figure 4, Fig. 4 is for regulating each load bus change in voltage comparing result schematic diagram in front and back; Abscissa represents load bus, ordinate represents node voltage, as can be seen from Figure, after adjustment, the node voltage of each load bus trends towards plateau more, can solve small power station unordered grid-connected time the voltage out-of-limit that brings and the excessive problem of transmission line loss, ensure user's voltage stabilization of each load bus.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (7)
1. small power station's Regulation Control method, is characterized in that, comprising:
Load flow calculation is carried out to the regional power grid containing small power station, determines the voltage of small power station's access each load bus rear;
In operation of power networks, according to the exerting oneself of each small power station, load and transmission line voltage condition, install comparable for load and small power station and there is the transmission line of voltage problem, changing the line power of electrical network and load position to carry out a pressure regulation;
A described pressure regulation comprises: one or more snippets feeder line section newly-built is carried out grid-connected, and utilize described feeder line section to change the position of the small power station's access electrical network containing the regional power grid of small power station, after the access of control small power station, the voltage of described load bus is in stability range.
2. small power station according to claim 1 Regulation Control method, it is characterized in that, if after a described pressure regulation, the voltage of described load bus still continues out-of-limit, then increase reactive-load compensation equipment at described load bus, and by carrying out switching control to reactive-load compensation equipment, secondary pressure regulation is carried out to load bus.
3. small power station according to claim 1 Regulation Control method, it is characterized in that, in the wet season, when user is in underload period and power supply survey voltage is higher, utilize newly-built feeder line section, and by carrying out orderly switching to the switch be arranged in feeder line section, be not less than under safe range at terminal temperature difference voltage, the small hydropower station of end is caused on front side of transmission line, controls the output voltage of small power station, by user's voltage control of front side, middle side in stability range.
4. small power station according to claim 1 Regulation Control method, it is characterized in that, in the non-wet season, when user is in high load capacity period, utilize newly-built feeder line section, and by carrying out orderly switching to the switch be arranged in feeder line section, the small hydropower station of exerting oneself in leading portion, stage casing is caused side, transmission line end, compensate falling of last side user's voltage, control user's voltage in stability range.
5. small power station according to claim 4 Regulation Control method, it is characterized in that, also comprise: the transmission line end side small power station of exerting oneself in setting range is caused on front side of transmission line, compensates user's Voltage Drop of nearby users, control the utilization voltage of whole piece feeder line user in stability range.
6. small power station according to claim 1 Regulation Control method, is characterized in that, described reactive-load compensation equipment comprises distributed electrical, and perhaps distributed electrical is anti-.
7. small power station according to claim 1 Regulation Control method, is characterized in that, described transmission line is 10kV circuit.
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| CN105894195A (en) * | 2016-03-31 | 2016-08-24 | 国家电网公司 | Regional water and power transmission capability analysis method based on network equivalence |
| CN105932771A (en) * | 2016-04-22 | 2016-09-07 | 国网浙江省电力公司丽水供电公司 | Small-hydropower-station voltage on-line monitoring device |
| CN107769249A (en) * | 2017-10-25 | 2018-03-06 | 广州供电局有限公司 | Distribution line overvoltage administering method and system containing small power station |
| CN109004672A (en) * | 2018-08-02 | 2018-12-14 | 贵州电网有限责任公司 | A method of improving rural power grids small power station grid entry point quality of voltage |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105894195A (en) * | 2016-03-31 | 2016-08-24 | 国家电网公司 | Regional water and power transmission capability analysis method based on network equivalence |
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| CN107769249A (en) * | 2017-10-25 | 2018-03-06 | 广州供电局有限公司 | Distribution line overvoltage administering method and system containing small power station |
| CN107769249B (en) * | 2017-10-25 | 2020-04-10 | 广州供电局有限公司 | Overvoltage treatment method and system for power distribution line containing small hydropower |
| CN109004672A (en) * | 2018-08-02 | 2018-12-14 | 贵州电网有限责任公司 | A method of improving rural power grids small power station grid entry point quality of voltage |
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