CN102946095A - Method and device for suppressing overvoltage of power distribution network caused by distributed power generation - Google Patents
Method and device for suppressing overvoltage of power distribution network caused by distributed power generation Download PDFInfo
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- CN102946095A CN102946095A CN2012104905668A CN201210490566A CN102946095A CN 102946095 A CN102946095 A CN 102946095A CN 2012104905668 A CN2012104905668 A CN 2012104905668A CN 201210490566 A CN201210490566 A CN 201210490566A CN 102946095 A CN102946095 A CN 102946095A
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Abstract
The invention relates to a method for suppressing overvoltage of a power distribution network caused by distributed power generation. A power distribution network system with distributed power supplies comprises a 10kV power distribution network, a 10kV/0.4kV transformer, a 0.4kV cable, a plurality of distributed power supplies and corresponding local loads, wherein the cable is divided into a plurality of sections according to a certain distance, and each section has line impedance. The method includes the steps: mounting voltage reducing devices on the cable at certain intervals; and starting the voltage reducing devices when the voltage of the cable is over-high due to access of the distributed power supplies to reduce the voltage of the cable to be within a permissible range. The method for suppressing the overvoltage of the power distribution network caused by distributed power generation is simple, the voltage is reduced in a distributed manner, the required voltage reducing devices are low in capacity, modular batch production can be performed, the maximum permissible access peak capacity of the distributed power supplies can be greatly improved by the method, and the penetration rate of the distributed power supplies in the power distribution network is increased.
Description
Technical field
The present invention relates to field of power, relate in particular to the method for the power distribution network over-voltage that a kind of inhibition causes by distributed power generation.
Background technology
In recent years, along with worldwide energy crisis is increasingly sharpened and the user improves constantly the requirement of supply of electric power quality and reliability, some drawbacks take large unit centralized power generation and large Power System Interconnection as the concentration supply power system of principal character present day by day.Under this background, distributed generation technology more and more receives publicity, and become the useful of existing large electrical network and replenished, be the development trend of following generation technology.Distributed power generation more dispersion so that distribution system becomes, the user will reduce the dependence of big power station and transmission line, thereby improve the electric power system flexibility.Continuous expansion along with distributed power source proportion in electric power system; distributed power source access electrical network; to bring a series of impact to voltage, the quality of power supply and the protection etc. of power transmission network especially power distribution network, wherein the important point may cause distributed power source access point place overvoltage exactly.Take distribution network line structure chart shown in Figure 1 as example, suppose that distributed power source moves with unity power factor, local load is zero, then power flows backwards on the 0.4kV cable, distributed power source is powered to power distribution network by 0.4kV cable and transformer, will produce pressure drop in the cable line impedance, makes distributed power source access point place voltage be higher than the transformer outgoing line side, if the capacity of distributed power source is very large, then will cause distributed power source access point place overvoltage.
At present, for the power distribution network over-voltage that suppresses to be caused by distributed power generation, the normal method that adopts is following several:
One, the supply power voltage of pressure/low-tension transformer output in the reduction;
Two, reduce the actual output capacity of distributed power source;
Three, distribution wire is transformed, it is long-pending to increase the cross-section of cable, namely uses thicker cable;
Four, in distribution wire, increase autotransformer and carry out pressure regulation;
Because the intermittence of distributed power source power output, when the distributed power source power output hour, method one may cause the under voltage of distribution wire end, and method one need to use on-load tap-changing transformer, does not generally possess in low-voltage network.
Method two has reduced the actual output capacity of distributed power source, has run counter to the original intention that distributed power source is installed.
The cost that method three and method four increase is too high, and economy is bad.
Summary of the invention
Technical problem: the deficiency that the objective of the invention is to overcome said method, characteristics for the distributed power source access, a kind of method that distributed power generation causes power distribution network over-voltage that suppresses is provided, the method can improve the maximum access peaking capacity that allows of distributed power source greatly, from improving the permeability of distributed power source power distribution network.
Technical scheme: inhibition distributed power generation of the present invention causes the method for power distribution network over-voltage, adopt distributed step-down method, namely in typical 400V, 10kV or 20kV power distribution network power transmission line every the 500m～5km distance dropping equipment of just connecting, when cable is introduced its overtension owing to the access of a plurality of distributed power sources, open dropping equipment, by dropping equipment separately or co-ordination, overvoltage processed the power distribution network bus voltage is dropped within the allowed band.
Described dropping equipment is existing dynamic electric voltage recovery device DVR.
Beneficial effect: the method for the power distribution network over-voltage that inhibition of the present invention is caused by distributed power generation, be applicable to multiple distributed power source occasion, such as photovoltaic or blower fan etc., compare with the existing conventional method of mentioning in the background technology, the method can not cause the under voltage of distribution wire end, can greatly improve the maximum access peaking capacity that allows of distributed power source, cost is low simultaneously.
Description of drawings
Fig. 1 is the distribution network line structural representation;
Fig. 2 is the distributed depressurizing system structure chart that is applied to power distribution network of the present invention;
Overpressure situation circuit diagram when Fig. 3 is single power supply access;
System construction drawing when Fig. 4 is the distributed step-down of employing of the present invention;
Fig. 5 is the dropping equipment structural representation.
Embodiment
Inhibition distributed power generation of the present invention causes the method for power distribution network over-voltage, characteristics for distributed power source access power distribution network, adopt distributed step-down method, namely in typical 400V, 10kV or 20kV power distribution network power transmission line every the 500m～5km distance dropping equipment of just connecting, when cable is introduced its overtension owing to the access of a plurality of distributed power sources, open dropping equipment, by dropping equipment separately or co-ordination, overvoltage processed the power distribution network bus voltage is dropped within the allowed band.
Described dropping equipment is existing dynamic electric voltage recovery device DVR.
The distributed step-down operation principle that proposes in order to analyze the present invention, for simplicity, suppose to only have in the circuit distributed power source at node n 3 outer access cables, constant-current source for 200A, as shown in Figure 3, the resistance of 3 sections circuits all is that 30m Ω (does not consider the induction reactance of circuit at this, this is because distributed power source generally all works under the unity power factor condition), node n 1, n2, n3 are respectively 406V at this moment, 412V and 418V, suppose the overvoltage standard on be limited to 409V, all overvoltage of 2 sections circuits are then arranged.If adopt the method that reduces the actual output capacity of distributed power source, then distributed power source can only be exported 100A, namely has the capacity of nearly 40KW to be wasted.
If the distributed step-down method that adopts the present invention to propose, as shown in Figure 4, allow the 1# dropping equipment produce in the line the voltage of the left positive right 4.5V that bears, the 2# dropping equipment also produces the voltage of the left positive right 4.5V that bears in the line, and the 3# dropping equipment does not participate in work, then node n 1, n2, n3 are respectively 401.5V, and 403V and 409V do not exceed superpotential standard.This moment, this 1# that participates in work only be 1.8KW with the capacity of 2# dropping equipment, and the nearly 40KW of output capacity of the distributed power sources of increase how, the capacity of the dropping equipment of increase less than its 5%.As seen, the method that adopts the present invention to propose can greatly improve the maximum permission access of distributed power source peaking capacity, thereby improve the permeability of distributed power source in power distribution network, and the extra cost that increases is very low.
Fig. 5 is the dropping equipment structure chart that the present invention uses, mainly formed by inverter, control unit, energy extraction units, series transformer, energy extraction units can be by energy storage device such as storage battery power supply, also can be by the 0.4kV cable power supply, can also be by various regenerative resources, such as photovoltaic or wind-driven generator power supply.When the needs step-down, the output of inverter just can produce a voltage at cable through series transformer, as shown in Figure 4, thereby crosses the function that arrives over-voltage suppression.
Claims (2)
1. one kind is suppressed the method that distributed power generation causes power distribution network over-voltage, it is characterized in that, adopt distributed step-down method, namely in typical 400V, 10kV or 20kV power distribution network power transmission line every the 500m～5km distance dropping equipment of just connecting, when cable is introduced its overtension owing to the access of a plurality of distributed power sources, open dropping equipment, by dropping equipment separately or co-ordination, overvoltage processed the power distribution network bus voltage is dropped within the allowed band.
2. a kind of method that distributed power generation causes power distribution network over-voltage that suppresses according to claim 1, base is characterised in that described dropping equipment is existing dynamic electric voltage recovery device DVR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104905668A CN102946095A (en) | 2012-11-27 | 2012-11-27 | Method and device for suppressing overvoltage of power distribution network caused by distributed power generation |
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| CN2012104905668A CN102946095A (en) | 2012-11-27 | 2012-11-27 | Method and device for suppressing overvoltage of power distribution network caused by distributed power generation |
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| CN2012104905668A Pending CN102946095A (en) | 2012-11-27 | 2012-11-27 | Method and device for suppressing overvoltage of power distribution network caused by distributed power generation |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09191577A (en) * | 1996-01-08 | 1997-07-22 | Nissin Electric Co Ltd | Self-excited reactive power compensation device |
| CN201035439Y (en) * | 2007-05-18 | 2008-03-12 | 北京思能达电力技术有限公司 | Reactive voltage automatic control system of wind power generation field |
| CN102510068A (en) * | 2011-11-06 | 2012-06-20 | 中国科学院电工研究所 | Distributed power quality conditioner and method for controlling same |
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2012
- 2012-11-27 CN CN2012104905668A patent/CN102946095A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09191577A (en) * | 1996-01-08 | 1997-07-22 | Nissin Electric Co Ltd | Self-excited reactive power compensation device |
| CN201035439Y (en) * | 2007-05-18 | 2008-03-12 | 北京思能达电力技术有限公司 | Reactive voltage automatic control system of wind power generation field |
| CN102510068A (en) * | 2011-11-06 | 2012-06-20 | 中国科学院电工研究所 | Distributed power quality conditioner and method for controlling same |
Non-Patent Citations (1)
| Title |
|---|
| 范元亮等: "过电压限制下分布式光伏电源最大允许接入峰值容量的计算", 《电力系统自动化》 * |
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Application publication date: 20130227 |