CN104600711A - Reactive power compensation device and method of small hydropower station - Google Patents

Reactive power compensation device and method of small hydropower station Download PDF

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Publication number
CN104600711A
CN104600711A CN201410617034.5A CN201410617034A CN104600711A CN 104600711 A CN104600711 A CN 104600711A CN 201410617034 A CN201410617034 A CN 201410617034A CN 104600711 A CN104600711 A CN 104600711A
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power
small
power station
small power
oneself
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CN201410617034.5A
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CN104600711B (en
Inventor
欧郁强
蔡德华
王利国
谢善益
翟瑞聪
李豪天
徐平
赵永发
曾强
曾联想
汪鹏敏
冯刘凯
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Shanghai Holleysoft System Co ltd
Jiangmen Power Supply Bureau of Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Shanghai Holleysoft System Co ltd
Jiangmen Power Supply Bureau of Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation

Abstract

The invention discloses a reactive power compensation device and method of a small hydropower station. The reactive power compensation method comprises step 1, collecting the water flow, the height of the water level height and the exciting current of the small hydropower station during grid connection power generation, obtaining the actual output information of the small hydropower station from storage data according to the information of the water flow, the height of the water level height and the exciting current, performing comparison on the actual output information and the grid connection power generation output requirements and putting into or out of a reactive power compensation capacitor group according to a comparison result; collecting a voltage and current waveform curve of the small hydropower station during operation of an isolated island, obtaining effective values of the voltage and the current and the output information of the small hydropower station according to the voltage and current waveform curve, predicting the output requirements of power loads in the island for the small hydropower station, performing comparison on the output requirements and the output information of the small hydropower station and putting into or out of the reactive power compensation capacitor group according to the comparison result. According to the reactive power compensation device and method of the small hydropower station, the reactive power compensation capacitor group is actively switched during grid connection power generation of the small hydropower station and accordingly the efficiency of the reactive power compensation is improved and the unnecessary switching times of the reactive power compensation capacitor group are reduced during operation of the isolated island and accordingly the reactive power compensation device and method is suitable for application.

Description

Small hydroelectric power reactive power compensation arrangement and method
Technical field
The present invention relates to hydropower station Technique of Compensating Capacitance for Reactive field, particularly relate to a kind of small hydroelectric power reactive power compensation arrangement and method.
Background technology
The general installed capacity of small hydropower station is little, is prevalent in remote mountain areas, because equipment does not match, though electric energy is good, owes reactive power phenomenon especially severe.Especially in the wet season, small hydropower station, in order to make full use of water energy, is robbed and is sent out active power, and the situation owing reactive power is particularly serious, not only impacts the power supply quality of electrical network, also result in great economic loss simultaneously to power station.Owe the problem of reactive power for a long time to solve small hydropower station, present processing method is the low-voltage reactive power compensation capacitor group in parallel complete in generator bus side.
Inventor finds that in prior art, there are the following problems: there is different requirements in small power station to the demand of reactive power compensation under the pattern of generating electricity by way of merging two or more grid systems and islet operation pattern, during islet operation, due to the imbalance of island internal loading distribution, three phase reactive power demand can be caused to there are differences, and existing reactive-load compensation capacitor can not meet the specific demand of two kinds of patterns simultaneously.
Summary of the invention
Based on above-mentioned situation, the present invention proposes a kind of small hydroelectric power reactive power compensation arrangement, can meet the specific demand of small power station to reactive power compensation under the pattern of generating electricity by way of merging two or more grid systems and islet operation pattern, structure is simple, cost is low, realistic application simultaneously.
To achieve these goals, the embodiment of technical solution of the present invention is:
A kind of small hydroelectric power reactive power compensation arrangement, comprises stage-discharge sampling module, AC/DC sampling module, processing module, three-phase total compensation reactive power compensation capacitor group and three-phase separate-supplement reactive power compensation capacitor group;
When described small power station generates electricity by way of merging two or more grid systems, described stage-discharge sampling module gathers the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature, described processing module is according to the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature, go out to obtain force data that described small power station generator is actual meritoriously exerts oneself from the described small power station generator prestored actual, idlely to exert oneself, merit angle and power factor information, and described information and described small power station are generated electricity by way of merging two or more grid systems run need meritorious and exert oneself, idlely to exert oneself, merit angle and power factor information compare, according to comparative result send drop into or exit instruction to described three-phase total compensation reactive power compensation capacitor group,
When described small power station's islet operation, described AC/DC sampling module gathers the wavy curve of voltage and current on described small power station generator bus, and the effective value of voltage and current on described small power station generator bus is obtained according to described wavy curve, described small power station generated power is exerted oneself, idlely to exert oneself, merit angle and power factor information, described processing module is according to the historical variations curve of the effective value of voltage and current on described small power station generator bus and the described small power station generator voltage that prestores and power factor, in prediction island, power load is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information, and power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, the described small power station generated power that merit angle and power factor requirements information and described AC/DC sampling module obtain is exerted oneself, idlely to exert oneself, merit angle and power factor information compare, according to comparative result send drop into or exit instruction to described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group.
For prior art problem, the invention allows for a kind of small hydroelectric power reactive power compensation method, to be incorporated into the power networks in situation while reactive power compensation feature meeting small power station, demand to phase-splitting reactive compensation when having taken into account small power station's islet operation, method is simple, reduce small hydroelectric power reactive power cost of compensation, be applicable to application.
The embodiment of technical solution of the present invention is:
A kind of small hydroelectric power reactive power compensation method, comprises the following steps:
When described small power station generates electricity by way of merging two or more grid systems, gather the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature, according to the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature goes out to obtain force data that described small power station generator is actual meritoriously exerts oneself from the described small power station generator prestored actual, idlely to exert oneself, merit angle and power factor information, and described information and described small power station are generated electricity by way of merging two or more grid systems run need meritorious and exert oneself, idlely to exert oneself, merit angle and power factor information compare, drop into according to comparative result or exit three-phase total compensation reactive power compensation capacitor group,
When described small power station's islet operation, gather the wavy curve of voltage and current on described small power station generator bus, and the effective value of voltage and current on described small power station generator bus is obtained according to described wavy curve, described small power station generated power is exerted oneself, idlely to exert oneself, merit angle and power factor information, according to the effective value of voltage and current on described small power station generator bus and the historical variations curve of the described small power station generator voltage prestored and power factor, in prediction island, power load is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information, and power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information and described small power station generated power are exerted oneself, idlely to exert oneself, merit angle and power factor information compare, drop into according to comparative result or exit three-phase total compensation reactive power compensation capacitor group or three-phase separate-supplement reactive power compensation capacitor group.
Compared with prior art, beneficial effect of the present invention is: small hydroelectric power reactive power compensation arrangement of the present invention and method, when small power station generates electricity by way of merging two or more grid systems, by the monitoring to electrical generation water flow, height of water level and exciter current of generator, obtain the reactive power needing to compensate, initiatively switching reactive power compensation capacitor group, improves the efficiency of reactive power compensation; Go out force data when islet operation by what obtain according to the wavy curve of voltage and current on small power station's generator bus and predict that in the island that obtains, power load compares small power station's demand of exerting oneself, according to comparative result switching reactive power compensation capacitor group, reduce the switching frequency of unnecessary reactive power compensation capacitor group, be applicable to application.
Accompanying drawing explanation
Fig. 1 is small power station's reactive power compensation device structural representation in an embodiment;
Fig. 2 is based on small power station's reactive power compensation device structural representation in Fig. 1 shown device concrete example;
Fig. 3 is small hydroelectric power reactive power compensation method flow chart when small power station generates electricity by way of merging two or more grid systems in an embodiment;
Small hydroelectric power reactive power compensation method flow chart when Fig. 4 is small power station's islet operation in an embodiment.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that embodiment described herein only in order to explain the present invention, do not limit protection scope of the present invention.
Small power station's reactive power compensation device in an embodiment, as shown in Figure 1, comprises stage-discharge sampling module, AC/DC sampling module, processing module, three-phase total compensation reactive power compensation capacitor group and three-phase separate-supplement reactive power compensation capacitor group;
When described small power station generates electricity by way of merging two or more grid systems, described stage-discharge sampling module gathers the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature, described processing module is according to the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature, go out to obtain force data that described small power station generator is actual meritoriously exerts oneself from the described small power station generator prestored actual, idlely to exert oneself, merit angle and power factor information, and described information and described small power station are generated electricity by way of merging two or more grid systems run need meritorious and exert oneself, idlely to exert oneself, merit angle and power factor information compare, according to comparative result send drop into or exit instruction to described three-phase total compensation reactive power compensation capacitor group,
When described small power station's islet operation, described AC/DC sampling module gathers the wavy curve of voltage and current on described small power station generator bus, and the effective value of voltage and current on described small power station generator bus is obtained according to described wavy curve, described small power station generated power is exerted oneself, idlely to exert oneself, merit angle and power factor information, described processing module is according to the historical variations curve of the effective value of voltage and current on described small power station generator bus and the described small power station generator voltage that prestores and power factor, in prediction island, power load is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information, and power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, the described small power station generated power that merit angle and power factor requirements information and described AC/DC sampling module obtain is exerted oneself, idlely to exert oneself, merit angle and power factor information compare, according to comparative result send drop into or exit instruction to described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group.
Known from the above description, small hydroelectric power reactive power compensation arrangement of the present invention, can meet the specific demand of small power station to reactive power compensation under the pattern of generating electricity by way of merging two or more grid systems and islet operation pattern simultaneously, be easy to realize and cost is low, realistic application.
As an embodiment, when described small power station generates electricity by way of merging two or more grid systems, after dropping into described three-phase total compensation reactive power compensation capacitor group, the reactive power of described small power station still owes the added time, and described processing module sends and drops into instruction to described three-phase separate-supplement reactive power compensation capacitor group;
Under operational mode is generated electricity by way of merging two or more grid systems in small power station, provide the reactive power compensation of two-part, avoid dropping into excessive compensation capacitors, be applicable to application.
As an embodiment, when described small power station's islet operation, power load in described island is exerted oneself to described small power station generated power by described processing module, idlely to exert oneself, in merit angle and power factor requirements information idle go out the described small power station generated power that obtains of force information and described AC/DC sampling module exert oneself, idlely to exert oneself, idle exerting oneself in merit angle and power factor information carries out mathematic interpolation, when the result calculated is less than or equal to setting threshold, the described small power station generated power that described processing module obtains according to described AC/DC sampling module is exerted oneself, idlely to exert oneself, merit angle and power factor information, transmission input or exit instruction are to described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group, when the result calculated is greater than setting threshold, described processing module according to preset time of delay transmission lag drop into or exit instruction give described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group,
In small power station's islet operation pattern, when the result calculated is less than or equal to setting threshold, according to the actual situation opening-closing capacitor bank of exerting oneself of small power station's generator, when the result calculated is greater than setting threshold, within time of delay, AC/DC sampling module image data obtains the actual situation of exerting oneself of small power station's generator, in processing module prediction island, power load is to the demand of exerting oneself of small power station's generator, and actual for small power station's generator situation and this demand of exerting oneself of exerting oneself is compared, according to repeatedly comparative result opening-closing capacitor bank, the switching frequency of unnecessary reactive power compensation capacitor group can be reduced, the useful life of extension device.
As an embodiment, when described small power station's islet operation, described processing module is according to the historical variations curve of the effective value of voltage and current on described small power station generator bus and the described small power station generator voltage that prestores and power factor, power load is exerted oneself to described small power station generated power in island, idlely exert oneself, merit angle and power factor requirements information to utilize simple regression method to predict, simply, accurately, using value is high.
As an embodiment, the electrical generation water flow of described small power station, height of water level and described small power station generator excitation unit are sent to described processing module to the exciting current that generator amature applies by wireless communication module by described stage-discharge sampling module, make apparatus structure more flexible, the application demand in multiple situation can be met, realistic.
As an embodiment, described wireless communication module is bluetooth module, increases the versatility of device, meets application demand.
In order to understand this device better, below elaborate the application example of a small hydroelectric power reactive power compensation arrangement of the present invention.
As shown in Figure 2, this application example can comprise hydrology transducer, exciting current transducer, AC/DC sampling unit, core processing unit, three-phase total compensation reactive power compensation capacitor group, three-phase separate-supplement reactive power compensation capacitor group and bluetooth module;
When small power station generates electricity by way of merging two or more grid systems, hydrology transducer gathers electrical generation water flow and the height of water level of small power station, exciting current transducer gathers the exciting current that small power station's generator excitation unit applies generator amature, the above-mentioned information collected is sent to core processing unit by bluetooth module by hydrology transducer and exciting current transducer, core processing unit goes out to obtain force data that small power station's generator is actual meritoriously exerts oneself from the small power station's generator prestored actual according to the information of hydrology transducer and the collection of exciting current transducer, idlely to exert oneself, merit angle and power factor information, and this information and small power station are generated electricity by way of merging two or more grid systems run need meritorious and exert oneself, idlely to exert oneself, merit angle and power factor information compare, according to comparative result send drop into or exit instruction to three-phase total compensation reactive power compensation capacitor group,
When small power station's islet operation, AC/DC sampling unit gathers the wavy curve of voltage and current on small power station's generator bus, and the effective value of voltage and current on small power station's generator bus is obtained according to this wavy curve, small power station's generated power is exerted oneself, idlely to exert oneself, merit angle and power factor information, core processing unit is according to the historical variations curve of the effective value of voltage and current on above-mentioned small power station generator bus and small power station's generator voltage of prestoring and power factor, in island, power load is exerted oneself to described small power station generated power to utilize simple regression method to predict, idlely to exert oneself, merit angle and power factor requirements information, and by this demand information idle go out small power station's generated power of obtaining of force information and AC/DC sampling unit exert oneself, idlely to exert oneself, idle exerting oneself in merit angle and power factor information carries out mathematic interpolation, when the result calculated is less than or equal to setting threshold, small power station's generated power that core processing unit obtains according to AC/DC sampling unit is exerted oneself, idlely to exert oneself, merit angle and power factor information, transmission input or exit instruction are to three-phase total compensation reactive power compensation capacitor group or three-phase separate-supplement reactive power compensation capacitor group, when the result calculated is greater than setting threshold, core processing unit according to preset time of delay transmission lag drop into or exit instruction to three-phase total compensation reactive power compensation capacitor group or three-phase separate-supplement reactive power compensation capacitor group,
When small power station generates electricity by way of merging two or more grid systems, after dropping into three-phase total compensation reactive power compensation capacitor group, the reactive power of small power station still owes the added time, core processing unit sends and drops into instruction to three-phase separate-supplement reactive power compensation capacitor group, three-phase separate-supplement reactive power compensation capacitor group compensates effect in the mode of three-phase total compensation reactive power compensation capacitor group to small power station's three-phase simultaneously, robs to reduce the small hydropower station wet season reactive power vacancy sent out when gaining merit;
When small power station's islet operation, when the result calculated is less than or equal to setting threshold, core processing unit is according to the actual situation opening-closing capacitor bank of exerting oneself of small power station's generator, when the result calculated is greater than setting threshold, within time of delay, AC/DC sampling unit image data obtains the actual situation of exerting oneself of small power station's generator, in core processing unit prediction island, power load is to the demand of exerting oneself of small power station's generator, and actual for small power station's generator situation and this demand of exerting oneself of exerting oneself is compared, according to repeatedly comparative result opening-closing capacitor bank, the switching frequency of unnecessary reactive power compensation capacitor group can be reduced, the useful life of extension device.
This application example small hydroelectric power reactive power compensation arrangement is when small power station generates electricity by way of merging two or more grid systems, by the monitoring to electrical generation water flow, height of water level and exciter current of generator, obtain the reactive power needing to compensate, initiatively switching reactive power compensation capacitor group, improves the efficiency of reactive power compensation; In the island small power station's generator output data obtained according to the wavy curve of voltage and current on small power station's generator bus and prediction obtained when islet operation, power load compares small power station's generator output demand, according to comparative result switching reactive power compensation capacitor group, reduce the switching frequency of unnecessary reactive power compensation capacitor group, extension fixture useful life; To be incorporated into the power networks in situation while reactive power compensation feature meeting small hydropower station, the demand to phase-splitting reactive compensation when having taken into account small power station's islet operation.
Small power station's Non Power Compensation Process in an embodiment, comprising:
When described small power station generates electricity by way of merging two or more grid systems, as shown in Figure 3, comprise the following steps:
Step S301: gather the exciting current that the electrical generation water flow of described small power station, height of water level and described small power station generator excitation unit apply generator amature;
Step S302: from the described small power station generator prestored actual, the exciting current applied generator amature according to the electrical generation water flow of described small power station, height of water level and described small power station generator excitation unit goes out to obtain force data that described small power station generator actually meritoriously to be exerted oneself, idlely to be exerted oneself, merit angle and power factor information;
Step S303: and described information and described small power station are generated electricity by way of merging two or more grid systems run that need meritorious is exerted oneself, idlely to be exerted oneself, merit angle and power factor information compares, drop into according to comparative result or exit three-phase total compensation reactive power compensation capacitor group;
When described small power station's islet operation, as shown in Figure 4, comprise the following steps:
Step S401: the wavy curve gathering voltage and current on described small power station generator bus, and obtain the effective value of voltage and current on described small power station generator bus according to described wavy curve, described small power station generated power is exerted oneself, idlely exert oneself, merit angle and power factor information;
Step S402: according to the historical variations curve of the effective value of voltage and current on described small power station generator bus and the described small power station generator voltage prestored and power factor, in prediction island power load described small power station generated power exerted oneself, idlely to exert oneself, merit angle and power factor requirements information;
Step S403: and power load in described island exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information and described small power station generated power are exerted oneself, idlely exert oneself, merit angle and power factor information compare, drop into according to comparative result or exit three-phase total compensation reactive power compensation capacitor group or three-phase separate-supplement reactive power compensation capacitor group.
Known from the above description, small hydroelectric power reactive power compensation method of the present invention, to be incorporated into the power networks in situation while reactive power compensation feature meeting small power station, demand to phase-splitting reactive compensation when having taken into account small power station's islet operation, method is simple, reduces small hydroelectric power reactive power cost of compensation, is applicable to application.
As an embodiment, when described small power station generates electricity by way of merging two or more grid systems, after dropping into described three-phase total compensation reactive power compensation capacitor group according to comparative result, the reactive power of described small power station still owes the added time, drops into three-phase separate-supplement reactive power compensation capacitor group;
Under operational mode is generated electricity by way of merging two or more grid systems in small power station, provide the reactive power compensation of two-part, avoid dropping into excessive compensation capacitors, be applicable to application.
As an embodiment, when described small power station's islet operation, power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information and described small power station generated power are exerted oneself, idlely to exert oneself, step that merit angle and power factor information compare comprises:
Power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, in merit angle and power factor requirements information idle go out force information and described small power station generated power exert oneself, idlely to exert oneself, idle exerting oneself in merit angle and power factor information carries out mathematic interpolation, when the result calculated is less than or equal to setting threshold, exert oneself according to described small power station generated power, idlely to exert oneself, merit angle and power factor information, drop into or exit described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group, when the result calculated is greater than setting threshold, drops into according to postponing the time of delay preset or exit described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group.
In small power station's islet operation pattern, when the result calculated is less than or equal to setting threshold, according to the actual situation opening-closing capacitor bank of exerting oneself of small power station's generator, when the result calculated is greater than setting threshold, within time of delay, image data obtains the actual situation of exerting oneself of small power station's generator, in prediction island, power load is to the demand of exerting oneself of small power station's generator, and actual for small power station's generator situation and this demand of exerting oneself of exerting oneself is compared, according to repeatedly comparative result opening-closing capacitor bank, the switching frequency of unnecessary reactive power compensation capacitor group can be reduced, the useful life of extension device.
As an embodiment, when described small power station's islet operation, in described prediction island, power load is exerted oneself to described small power station generated power, idlely to be exerted oneself, the step of merit angle and power factor requirements information comprises:
According to the effective value of voltage and current on described small power station generator bus and the historical variations curve of the described small power station generator voltage prestored and power factor, power load is exerted oneself to described small power station generated power in island, idlely exert oneself, merit angle and power factor requirements information to utilize simple regression method to predict, simply, accurately, using value is high.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.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 (10)

1. a small hydroelectric power reactive power compensation arrangement, is characterized in that, comprises stage-discharge sampling module, AC/DC sampling module, processing module, three-phase total compensation reactive power compensation capacitor group and three-phase separate-supplement reactive power compensation capacitor group;
When described small power station generates electricity by way of merging two or more grid systems, described stage-discharge sampling module gathers the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature, described processing module is according to the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature, go out to obtain force data that described small power station generator is actual meritoriously exerts oneself from the described small power station generator prestored actual, idlely to exert oneself, merit angle and power factor information, and described information and described small power station are generated electricity by way of merging two or more grid systems run need meritorious and exert oneself, idlely to exert oneself, merit angle and power factor information compare, according to comparative result send drop into or exit instruction to described three-phase total compensation reactive power compensation capacitor group,
When described small power station's islet operation, described AC/DC sampling module gathers the wavy curve of voltage and current on described small power station generator bus, and the effective value of voltage and current on described small power station generator bus is obtained according to described wavy curve, described small power station generated power is exerted oneself, idlely to exert oneself, merit angle and power factor information, described processing module is according to the historical variations curve of the effective value of voltage and current on described small power station generator bus and the described small power station generator voltage that prestores and power factor, in prediction island, power load is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information, and power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, the described small power station generated power that merit angle and power factor requirements information and described AC/DC sampling module obtain is exerted oneself, idlely to exert oneself, merit angle and power factor information compare, according to comparative result send drop into or exit instruction to described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group.
2. small hydroelectric power reactive power compensation arrangement according to claim 1, it is characterized in that, when described small power station generates electricity by way of merging two or more grid systems, after dropping into described three-phase total compensation reactive power compensation capacitor group, the reactive power of described small power station still owes the added time, and described processing module sends and drops into instruction to described three-phase separate-supplement reactive power compensation capacitor group.
3. small hydroelectric power reactive power compensation arrangement according to claim 1 and 2, it is characterized in that, when described small power station's islet operation, power load in described island is exerted oneself to described small power station generated power by described processing module, idlely to exert oneself, in merit angle and power factor requirements information idle go out the described small power station generated power that obtains of force information and described AC/DC sampling module exert oneself, idlely to exert oneself, idle exerting oneself in merit angle and power factor information carries out mathematic interpolation, when the result calculated is less than or equal to setting threshold, the described small power station generated power that described processing module obtains according to described AC/DC sampling module is exerted oneself, idlely to exert oneself, merit angle and power factor information, transmission input or exit instruction are to described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group, when the result calculated is greater than setting threshold, described processing module according to preset time of delay transmission lag drop into or exit instruction give described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group.
4. small hydroelectric power reactive power compensation arrangement according to claim 1, it is characterized in that, when described small power station's islet operation, described processing module is according to the historical variations curve of the effective value of voltage and current on described small power station generator bus and the described small power station generator voltage that prestores and power factor, and in island, power load is exerted oneself to described small power station generated power, idlely exert oneself, merit angle and power factor requirements information to utilize simple regression method to predict.
5. small hydroelectric power reactive power compensation arrangement according to claim 1, it is characterized in that, the electrical generation water flow of described small power station, height of water level and described small power station generator excitation unit are sent to described processing module to the exciting current that generator amature applies by wireless communication module by described stage-discharge sampling module.
6. small hydroelectric power reactive power compensation arrangement according to claim 5, is characterized in that, described wireless communication module is bluetooth module.
7. a small hydroelectric power reactive power compensation method, is characterized in that, comprises the following steps:
When described small power station generates electricity by way of merging two or more grid systems, gather the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature, according to the electrical generation water flow of described small power station, the exciting current that height of water level and described small power station generator excitation unit apply generator amature goes out to obtain force data that described small power station generator is actual meritoriously exerts oneself from the described small power station generator prestored actual, idlely to exert oneself, merit angle and power factor information, and described information and described small power station are generated electricity by way of merging two or more grid systems run need meritorious and exert oneself, idlely to exert oneself, merit angle and power factor information compare, drop into according to comparative result or exit three-phase total compensation reactive power compensation capacitor group,
When described small power station's islet operation, gather the wavy curve of voltage and current on described small power station generator bus, and the effective value of voltage and current on described small power station generator bus is obtained according to described wavy curve, described small power station generated power is exerted oneself, idlely to exert oneself, merit angle and power factor information, according to the effective value of voltage and current on described small power station generator bus and the historical variations curve of the described small power station generator voltage prestored and power factor, in prediction island, power load is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information, and power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information and described small power station generated power are exerted oneself, idlely to exert oneself, merit angle and power factor information compare, drop into according to comparative result or exit three-phase total compensation reactive power compensation capacitor group or three-phase separate-supplement reactive power compensation capacitor group.
8. small hydroelectric power reactive power compensation method according to claim 7, it is characterized in that, when described small power station generates electricity by way of merging two or more grid systems, after dropping into described three-phase total compensation reactive power compensation capacitor group according to comparative result, the reactive power of described small power station still owes the added time, drops into three-phase separate-supplement reactive power compensation capacitor group.
9. the small hydroelectric power reactive power compensation method according to claim 7 or 8, it is characterized in that, when described small power station's islet operation, power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, merit angle and power factor requirements information and described small power station generated power are exerted oneself, idlely to exert oneself, step that merit angle and power factor information compare comprises:
Power load in described island is exerted oneself to described small power station generated power, idlely to exert oneself, in merit angle and power factor requirements information idle go out force information and described small power station generated power exert oneself, idlely to exert oneself, idle exerting oneself in merit angle and power factor information carries out mathematic interpolation, when the result calculated is less than or equal to setting threshold, exert oneself according to described small power station generated power, idlely to exert oneself, merit angle and power factor information, drop into or exit described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group, when the result calculated is greater than setting threshold, drops into according to postponing the time of delay preset or exit described three-phase total compensation reactive power compensation capacitor group or described three-phase separate-supplement reactive power compensation capacitor group.
10. small hydroelectric power reactive power compensation method according to claim 7, it is characterized in that, when described small power station's islet operation, in described prediction island, power load is exerted oneself to described small power station generated power, idlely to be exerted oneself, the step of merit angle and power factor requirements information comprises:
According to the historical variations curve of the effective value of voltage and current on described small power station generator bus and the described small power station generator voltage prestored and power factor, in island, power load is exerted oneself to described small power station generated power, idlely exert oneself, merit angle and power factor requirements information to utilize simple regression method to predict.
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