CN104779622B - The idle difference control method of medium voltage distribution network distributed power source based on staircase chart - Google Patents
The idle difference control method of medium voltage distribution network distributed power source based on staircase chart Download PDFInfo
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- CN104779622B CN104779622B CN201510107712.8A CN201510107712A CN104779622B CN 104779622 B CN104779622 B CN 104779622B CN 201510107712 A CN201510107712 A CN 201510107712A CN 104779622 B CN104779622 B CN 104779622B
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Abstract
The invention discloses the idle difference control method of medium voltage distribution network distributed power source based on staircase chart.Which comprises the following steps：（1）The voltage of measurement distributed power source grid entry point；（2）If grid entry point voltage out-of-limit, adjustment the idle of distributed power source is exerted oneself so that voltage falls into acceptability limit；（3）If grid-connected point voltage is qualified, difference control is carried out to idle the exerting oneself of distributed power source according to staircase chart so that it is interval interior that the power factor of grid entry point falls into power factor corresponding with voltage；（4）Grid-connected point voltage is measured again and updates numerical value, judge whether which is matched with the power factor interval in staircase chart, if matching, this regulation is completed, if mismatching, by the current idle holding 5 minutes of exerting oneself of distributed power source, return again to step（1）.The inventive method judges by grid-connected point voltage and adjusts that the idle of distributed power source is exerted oneself, energy-conservation and voltage regulation result substantially, with it is simple to operation the characteristics of.
Description
Technical field
The present invention relates to a kind of optimal control method of the distributed power source of power system, particularly presses (10kV) in one kind
The optimal control method that the distributed power source of power distribution network is idle to exert oneself.
Background technology
In recent years, due to the gradually exhaustion of the fossil energies such as oil, coal, energy crisis worldwide further adds
It is deep.Meanwhile, fossil energy produced pollution gas, carbon dioxide etc. in process of production, to life for the survival of mankind
State environment causes serious impact.Wherein, carbon dioxide is to cause global warming in atmospheric accumulation, adverse weather, ice
River is melted, the main cause that sea level rise, the serious survival and development for threatening the mankind.National wide range of haze since 2013
Weather, allow the whole society by it is a kind of it is most direct and deep in the way of the urgency having experienced environmental protection and reduced discharging.
Under such severe situation, realize that the sustainable development of economic and society is greener than fossil energy in the urgent need to finding
The more environmentally friendly energy form of color, auxiliary even replace fossil energy, and the new forms of energy with wind energy, solar energy as representative are exactly this
New energy form.The intelligent grid accessed as characteristic feature with adapting to extensive new forms of energy distributed power generation studies just gradually emerging
Rise, to adapt to the change of global economic development trend.The starting point of intelligent grid be ensure electrical network itself it is safe, economical,
It is reliable, while the high usage of the environmental protection of generating link, energy-conservation and the energy is realized, the efficient and promotion electricity market of link of transmitting electricity
Formation so that power industry obtains benign development, the distributed power source with generation of electricity by new energy as principal mode is undoubtedly
One of developing basic driver power of intelligent grid.
The drawbacks of traditional centralized power generation, long distance power transmission, power supply mode of bulk power grid interconnection and risk gradually expose
Come, and on the other hand with the raising of distributed generation technology and interconnection technology, the price of distributed power source progressively declines, some
Distributed power source can compare favourably with traditional power supply in Technological Economy；Electricity market is also in gradually perfect, many states simultaneously
Family has all put into effect the development policies for supporting distributed power source, and the share that this causes distributed power source shared in electricity market is more next
Bigger, increasing distributed power source is run in being linked into power distribution network.
Meanwhile, domestic Two large pools companies put into effect supporting policy, actively support the grid-connected of distributed power generation.State's household electrical appliances
Net is put into effect《Suggestion with regard to carrying out the grid-connected services of distributed photovoltaic power generation》、《With regard to promoting distributed photovoltaic power generation grid-connected
The suggestion of management》.South electric network is put into effect《With regard to the instruction for further supporting the development of the new forms of energy such as photovoltaic》、《South electric network
Company's distributed photovoltaic power generation service guide》.
After DG accesses power distribution network, the structure of power distribution network is revolutionized, power distribution network is changed into from single supply radial structure
Spread all over the labyrinth of power supply, the reactive voltage characteristic to power distribution network is produced significant impact by the change of this structure.With wind-powered electricity generation,
Photovoltaic is that the distributed new of representative accesses the characteristic for not only changing conventional electrical distribution network energy one-way flow, and because of its generating
Intermittence, fluctuation and it is uncertain cause voltage pulsation more aobvious acutely, more because which passes through the connection of converters
So that the reactive voltage characteristic of power distribution network either stable state or transient state all bring significant change, and then to the idle of power distribution network
Voltage control brings very big challenge.In order to preferably receive DG, give full play to the positive role of DG and suppress which to negatively affect,
Need DG is analysed in depth and studied to the Influencing Mechanism of electric distribution network reactive-voltage characteristic, and then study power distribution network and adapt to DG
The reactive voltage control method of access, it is ensured that the safe and reliable and economical operation of power distribution network.
Current distributed power source typically all has certain Reactive-power control ability, it is possible to achieve slow phase and leading phase operation,
Can realize in certain scope idle controllable.And being exerted oneself due to distributed power source is affected with extraneous factors such as weather and environment
Intermittence, fluctuation and uncertainty, how to control its idle exerting oneself and could obtain more preferable quality of voltage and drop damage ability
Become an important problem.
In general, in order to avoid causing influence of fluctuations to electrical network, present distributed power source it is most using determine power because
Number operation modes, control according to a suitable power factor median it is idle exert oneself, so can reduce due to exerting oneself
Change and the fluctuation that causes, but while also abandon the original part Reactive-power control ability of distributed power source, dynamic control is become
For static operation.And part distributed power source remains its Reactive-power control ability, but for how to formulate strategy which exerts oneself and
The problem of criterion then remains unsolved：If keep precisely, control in real time can have a preferable voltage regulation result, but control flow and
Algorithm can be more complicated, operates with certain difficulty；If using the control of extensive style again it is difficult to ensure that the effect of pressure regulation
Really, it is possible that the situation of frequent movement or voltage out-of-limit.
In actual motion, active power to the frequency influence of electrical network than larger, and reactive power voltage then with electrical network
It is more related.In general, the voltage of power network line is higher when idle abundant, when idle deficient, then voltage is possible to inclined
It is low, therefore in most cases voltage can weigh the idle whether sufficient of the circuit or area as a leading indicator.
In low voltage, it may be considered that properly increase the idle of distributed power source and exert oneself, which is allowed to run under delayed power factor,
The reactive loss and load of circuit are supported；When voltage is higher, appropriate the idle of distributed power source that reduce is exerted oneself, or even
Leading phase operation absorbs idle, alleviates the problem of the idle surplus of circuit or overtension.
The content of the invention
It is an object of the invention to provide the idle difference control method of medium voltage distribution network distributed power source based on staircase chart,
The technical problem of solution is to realize the idle uneoupled control of power distribution network distributed power source.
Based on the idle difference control method of medium voltage distribution network distributed power source of staircase chart, which comprises the following steps：
(1) voltage of distributed power source grid entry point is measured, V is denoted asb；
(2) if VbMore the upper limit, then reduce the idle of distributed power source and exert oneself, if VbMore lower limit, then increase distributed power source
It is idle to exert oneself, until VbNot out-of-limit or distributed power source is idle to exert oneself and reaches the limit of；If the idle of distributed power source is exerted oneself
Reach the limit of, then this secondary control is completed, proceed by the control operation of next round after setting time T1 again from step (1)；
(3) if VbIt is not out-of-limit, then according to staircase chart according to VbSize exert oneself adjusting the idle of distributed power source so that
The power factor of grid entry pointFall with VbIn corresponding power factor is interval；
(4) grid-connected point voltage is measured again and updates VbNumerical value, it is adjusted it is idle exert oneself after Vb, judge VbWhether with
The interval matching of the power factor of staircase chart, if matching, this secondary control is completed, is opened from step (1) after setting time T1 again
Beginning carries out the control operation of next round；If mismatching, by current idle holding setting time T2 of exerting oneself of distributed power source, it
After return again to step (1).
Further, the step (3) according to staircase chart according to VbSize exert oneself adjusting the idle of distributed power source,
If referring to 9.3kV≤Vb＜ 10kV, then control distributed power source it is idle exert oneself so thatIn delayed 0.85 to delayed 0.98
Between；If 10kV≤Vb＜ 10.4kV, then control distributed power source it is idle exert oneself so thatIn delayed 0.96 in advance
Between 0.98；If 10.4kV≤Vb≤ 10.7kV, then control distributed power source it is idle exert oneself so thatArrive in advanced 0.90
Between 1.
Further, V in step (4)bMatch with the power factor interval of staircase chart, refer to as 9.3kV≤Vb＜ 10kV
When,Between delayed 0.85 to delayed 0.98；As 10kV≤VbDuring ＜ 10.4kV,Arrive in delayed 0.96
Between advanced 0.98；As 10.4kV≤VbDuring≤10.7kV,Between advanced 0.90 to 1.
The present invention compared with prior art, has the advantage that and technique effect：
The present invention by the grid entry point voltage monitoring to Distributed Generation in Distribution System, to the electricity for assessing current grid entry point
Pressure and idle situation, and differentiation control is carried out for different voltage levels, the interval conduct point of different power factors is set
Foundation and constraints that cloth power supply is idle to exert oneself, relieve distributed power source control to the whole network trend and communication adjustment according to
Rely, realize the idle uneoupled control of distributed power source.
Description of the drawings
Fig. 1 is method of the present invention flow chart.
Voltage with power factor corresponding control staircase charts of the Fig. 2 for the inventive method.
Single line schematic diagrams of the Fig. 3 for the distribution line of the embodiment of the present invention.
Photo-voltaic power supply active power curves of the Fig. 4 for the embodiment of the present invention.
Wind-powered electricity generation power supply active power curves of the Fig. 5 for the embodiment of the present invention.
Small power station power supply active power curves of the Fig. 6 for the embodiment of the present invention.
Fig. 7 is total load rate change curve in a day of the embodiment of the present invention.
Rate of qualified voltage correlation curves of the Fig. 8 for two kinds of controls of the embodiment of the present invention.
Active loss correlation curves of the Fig. 9 for two kinds of controls of the embodiment of the present invention.
Specific embodiment
Do further detailed description with reference to the accompanying drawings and examples to the present invention, but the enforcement and protection of the present invention is not
It is limited to this, if having below, is that those skilled in the art can refer to prior art realization.
As shown in figure 1, for the distribution line comprising distributed power source, the 10kV power distribution networks based on staircase chart of this example
Difference control method that distributed power source is idle, for a specific distributed power source, its control is comprised the following steps：
(1) voltage of the distributed power source grid entry point is measured with the monitoring device of distribution automation equipment or the power supply point,
It is denoted as Vb；
(2) if judging VbThe more upper limit, i.e. Vb>10.7kV, then reduce the idle of distributed power source and exert oneself, until VbIt is qualified (no
It is out-of-limit) or idle the exerting oneself of distributed power source reach the limit of；If VbMore lower limit, i.e. Vb<9.3kV, then increase the idle of distributed power source
Exert oneself, until VbQualified or distributed power source is idle to exert oneself and reaches the limit of；If idle the exerting oneself of distributed power source has arrived at pole
Limit, then this secondary control is completed, and jumps out operation, proceeds by the control operation of next round after 15 minutes again from step (1)；
(3) if VbIt is qualified, then according to staircase chart according to VbSize exert oneself adjusting the idle of distributed power source, even
9.3kV≤Vb＜ 10kV, then control idle the exerting oneself of distributed power source and cause the power factor of grid entry pointIn delayed 0.85
To between delayed 0.98；If 10kV≤Vb＜ 10.4kV, then control distributed power source it is idle exert oneself cause grid entry point power because
NumberBetween delayed 0.96 to advanced 0.98；If 10.4kV≤Vb≤ 10.7kV, then control distributed power source it is idle go out
Power causes the power factor of grid entry pointBetween advanced 0.90 to 1；If idle the exerting oneself of distributed power source has arrived at
The limit, then this secondary control complete, proceed by the control operation of next round after 15 minutes again from step (1)；
(4) by previous step adjust distributed power source it is idle exert oneself after, measure grid-connected point voltage again and update numerical value,
It is adjusted it is idle exert oneself after Vb, judge whether which is matched with the power factor interval of staircase chart, even 9.3kV≤Vb＜
10kV, thenShould be between delayed 0.85 to delayed 0.98；If 10kV≤Vb＜ 10.4kV, thenShould be at stagnant
Afterwards between 0.96 to advanced 0.98；If 10.4kV≤Vb≤ 10.7kV, thenShould be between advanced 0.90 to 1；If
Match somebody with somebody, then this secondary control is completed, after 15 minutes, proceed by the control operation of next round again from step (1)；If mismatch, by work as
Front distributed power source is idle to exert oneself holding 5 minutes, it is to avoid in the idle short time of exerting oneself, frequently change causes power network fluctuation, afterwards
Return again to step (1).
A distribution line for choosing southern somewhere carries out Simulation Example to the present invention, and its line chart is as shown in Figure 3.Should
Circuit has 27 load points, and distribution transforming total capacity is 9360kW, wherein 20 load points have installation reactive-load compensation, compensates total capacity
For 1861kvar, the circuit also includes 5 distributed power sources, wherein 4 have Reactive-power control ability, can adopt the control of the present invention
Method processed is controlled.
The load bus and reactive-load compensation installation situation of the circuit is as shown in table 1.
1 load bus of table and reactive-load compensation equipment installation situation
Distributed power source in circuit includes 2 photo-voltaic power supplies, 1 wind-powered electricity generation power supply and 1 small power station's power supply, its song of exerting oneself
Line is respectively as shown in accompanying drawing 4, Fig. 5, Fig. 6.In order to compare the quality of the method for the present invention and general control method, the present embodiment root
The fluctuation of distribution transformer load level is simulated according to daily load curve, so as to carry out the continuous imitative of 24 hours totally 96 moment points
Very, it is illustrated in figure 7 total load rate change curve in a day.
In general control method, the idle of distributed power source exerts oneself mode to determine power factor controlling, no matter i.e. voltage
Level and load level height, idle being exerted oneself only exert oneself related to active, determine power factor and runs.The following is to general control side
The contrast simulation result of method and control method of the present invention.
In terms of rate of qualified voltage, the rate of qualified voltage curve under two kinds of control methods is as shown in Figure 8, it is seen that typically controlling
There is the significant component of time that the situation of voltage out-of-limit occurs under method processed, it cannot be guaranteed that electricity in the case of the fluctuation of load
Pressure is completely qualified.And under the control method of the present invention, voltage level was obviously improved compared with general control method, at one day
100% qualification rate is attained by 24 hours.
In terms of active loss, the active loss at two kinds of control methods next each moment of day is as shown in Figure 9, it is seen that negative
When load level is relatively low, the active loss of two kinds of control methods is essentially identical；And with the weightening of load level, it is of the invention
Method gradually embodies advantage, as seen from Figure 9, the method for the present invention than general control method have significantly more save
Can drop damage effect.
And in terms of reactive-load compensation equipment switching frequency, under general control method due to distributed power source determine power because
Number operation, does not adapt to the change and voltage pulsation of trend, and the time gets off to count the switching frequency of reactive-load compensation equipment and is
668 times, and the method for the present invention is with the in good time adjustable strategies of voltage pulsation so that the switching frequency of reactive-load compensation equipment significantly under
Drop, whole day statistics only 353 times, the about half of conventional method, so as to reach the effect for preferably protecting reactive-load compensation equipment.
It is that the effect of two kinds of control methods collects contrast as shown in table 2, when wherein the qualified ratio of voltage refers to one day 96
Between put in all qualified time points of voltage and the ratio of timing node sum.
The effect of 2 two kinds of control methods of table collects contrast
The method of the present invention is applied in the power distribution network containing distributed power source, can further improve the ability of saving energy and decreasing loss
With significantly improve the qualified level of voltage, the switching frequency of reactive-load compensation equipment can also be reduced on this basis, set so as to protect
It is standby to increase the service life, promote the use of the economy and security that can improve operation of power networks.
The above, patent preferred embodiment only of the present invention, but the protection domain of patent of the present invention is not limited to
This, any those familiar with the art in the scope disclosed in patent of the present invention, according to the skill of patent of the present invention
Art scheme and its inventive concept equivalent or change in addition, belong to the protection domain of patent of the present invention.
Claims (1)
1. the idle difference control method of medium voltage distribution network distributed power source based on staircase chart, it is characterised in that including following step
Suddenly：
(1) voltage of distributed power source grid entry point is measured, V is denoted asb；
(2) if VbMore the upper limit, then reduce the idle of distributed power source and exert oneself, if VbMore lower limit, then increase the idle of distributed power source
Exert oneself, until VbNot out-of-limit or distributed power source is idle to exert oneself and reaches the limit of；If idle the exerting oneself of distributed power source has arrived at
The limit, then this secondary control complete, proceed by the control operation of next round after setting time T1 again from step (1)；
(3) if VbIt is not out-of-limit, then according to staircase chart according to VbSize exert oneself adjusting the idle of distributed power source so that it is grid-connected
The power factor of pointFall with VbIn corresponding power factor is interval；It is described according to staircase chart according to VbSize adjusting
Section the idle of distributed power source is exerted oneself, if referring to 9.3kV≤Vb＜ 10kV, then control distributed power source it is idle exert oneself so thatBetween delayed 0.85 to delayed 0.98；If 10kV≤Vb＜ 10.4kV, then controlling idle the exerting oneself of distributed power source makes
Between delayed 0.96 to advanced 0.98；If 10.4kV≤Vb≤ 10.7kV, then control distributed power source it is idle go out
Power is causedBetween advanced 0.90 to 1
(4) grid-connected point voltage is measured again and updates VbNumerical value, it is adjusted it is idle exert oneself after Vb, judge VbWhether with ladder
The interval matching of the power factor of figure, if matching, this secondary control is completed, after setting time T1 again from step (1) start into
The control operation of row next round；If mismatching, by current idle holding setting time T2 of exerting oneself of distributed power source, Zhi Houzai
Return to step (1)；The VbMatch with the power factor interval of staircase chart, refer to as 9.3kV≤VbDuring ＜ 10kV,Place
Between delayed 0.85 to delayed 0.98；As 10kV≤VbDuring ＜ 10.4kV,In delayed 0.96 to advanced 0.98 it
Between；As 10.4kV≤VbDuring≤10.7kV,Between advanced 0.90 to 1.
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| CN105162136B (en) * | 2015-08-31 | 2017-08-25 | 广东电网有限责任公司佛山供电局 | User power factor control method based on the idle control of comprehensive energy |
| CN105140964B (en) * | 2015-09-24 | 2017-07-21 | 中国南方电网有限责任公司 | 10kV power distribution network power coordination control methods containing photo-voltaic power supply |
| CN107910877B (en) * | 2017-11-27 | 2019-12-31 | 西安交通大学 | Switching control method for parallel capacitor in high-power fluctuation of sending end converter station |
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| JP3455805B2 (en) * | 1994-06-02 | 2003-10-14 | 株式会社日立製作所 | High voltage distribution line voltage control method and apparatus |
| CN102624034B (en) * | 2012-03-28 | 2014-09-10 | 华南理工大学 | Wind power station dispatching fit type idle work operation method suitable for high voltage power grid |
| CN103414196B (en) * | 2013-07-16 | 2015-06-10 | 中国科学院电工研究所 | Grid-connected inverter grid-connection point voltage dynamic compensation control method |
| CN104362648B (en) * | 2014-11-05 | 2016-06-29 | 许继电气股份有限公司 | A kind of idle phase modulation method of photovoltaic plant |
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