CN103560580A - Substation photovoltaic capacity determining method - Google Patents

Abstract

The invention relates to a substation photovoltaic capacity determining method. The method comprises the steps of setting up a matching model of photovoltaic capacity and substation load capacity, initially determining the range of photovoltaic system capacity according to the restriction condition of the sum of the load used by the substation, setting up a power matching model of the photovoltaic capacity and urgent operation load, and determining the photovoltaic capacity. According to the substation photovoltaic capacity determining method, normal production load in the substation and urgent accident state load are considered, load characteristics under different conditions to solve the capacity of the substation photovoltaic system are combined. The method can be effectively matched with the requirements of the substation load and plays an active promoting role in improving the utilization rate of the substation photovoltaic system.

Description

A kind of transformer station photovoltaic holds method for determination of amount

Technical field

The invention belongs to substation planning design field, particularly a kind of transformer station photovoltaic holds method for determination of amount.

Background technology

In transformer station, introduce photovoltaic system, can realize clean environment firendly, the energy efficiency of transformer station.

But be limited to substation equipment layout feature and safe operation requirement, in transformer station, the access of photovoltaic system need to meet many conditions, as stand internal loading feature and distribution, enlarging recent and at a specified future date, ac and dc systems receiving ability etc.Wherein topmost influencing factor is the load actual demand in transformer station, in station, space resources is limited on the one hand, for the economic benefit that develops skill, people wish the demand that the access of photovoltaic system can at utmost press close to stand interior normal running load, be subject on the other hand the restriction of urgent running status, too much photovoltaic system also easily produces excess power under urgent running status, not only impacts photovoltaic apparatus and station power consumption equipment, also exist and reduce equipment life, cause the problems such as energy waste.

In order to improve transformer station photovoltaic system access effects of energy saving and emission reduction, need to be for Substation Station internal loading the operation characteristic under different operating modes, determine that the capacity that improves photovoltaic system capacity matching degree determines that method ，Wei planning and designing transformer station provides reference.

Summary of the invention

The object of the invention is for photovoltaic system in transformer station, propose a kind of photovoltaic system appearance method for determination of amount of considering transformer station's load demand under different operating modes.

The present invention solves its technical problem and takes following technical scheme to realize:

Photovoltaic holds a method for determination of amount, comprises that step is as follows:

(1) set up photovoltaic capacity and the Matching Model of load capacity for station, press the principle that photovoltaic system power output mate with transformer station load power, setting up stands uses the constraints of the total amount of loading; Constraints formula is:

$S=\underset{i=\mathrm{1,2}\·\·\·n}{\mathrm{\Σ}}{a}_i{L}_i+L$ Formula 1

In formula, S representative is load total capacity for station, a _irepresent the simultaneity factor of i kind load, L _irepresent the watt level of i kind load, and L represents constant load;

(2) according to station, by the constraints of load total amount, tentatively determine photovoltaic system range of capacity; When photovoltaic system capacity mates with load with station, should satisfy condition:

R * P >=S formula 2

Wherein, R represents the year hours of operation of photovoltaic system, and P represents the capacity of photovoltaic system, and by formula 1 and formula 2 simultaneous, the range of capacity that obtains photovoltaic system is:

$P\≥(\underset{i=1\·\·\·n}{\mathrm{\Σ}}{a}_i{L}_i+L)/R$ Formula 3

(3) set up the power match model of photovoltaic capacity and urgent operating load;

When transformer station is during in urgent running status, be subject to the restriction of working voltage and short circuit current, the capacity of photovoltaic system need to meet following formula and require:

$P\≤\underset{j=1\·\·\·m}{\mathrm{\Σ}}{b}_j{L}_j$ Formula 4

Wherein, j represents the load for j kind station under the state of emergency, and m≤n;

(4) photovoltaic system capacity is determined;

Determining on the scope basis of photovoltaic system capacity, photovoltaic capacity processed to judgement with load under the state of emergency according to identical dimensional space, namely the power P of photovoltaic system is being divided into the sub-capacity p of m equivalent size, can obtain thus:

$\left\{\begin{array}{c}P=\underset{k=1\·\·\·m}{\mathrm{\Σ}}{c}_{k}p\\ p=P/n\end{array}\right.$ Formula 5

Wherein, c _krepresent the sub-capacity coefficient of photovoltaic mating with load under the state of emergency, and p is by the sub-calculation of capacity value of photovoltaic system under general running status, adopts mean effective value method Coefficient of determination c _kvalue, publicity is expressed as:

$c_k=\sqrt{{(a_k+L/R)}^2+{b_k}^2+\underset{l=k+1\·\·\·k+3}{\mathrm{\Σ}{a}_1}}/3(k=1\·\·\·m)$

Finally obtain photovoltaic system capacity, equation expression is:

$P=p\×\underset{k=1\·\·\·j}{\mathrm{\Σ}}\sqrt{{(a_k+L/R)}^2+{b_k}^2+\underset{l=k+1\·\·\·k+3}{\mathrm{\Σ}{a}_1}}/3.$

Advantage of the present invention and good effect are

1, the present invention, owing to considering transformer station's load character, so can rationally determine photovoltaic system capacity according to station internal loading situation, realizes effective coupling of load capacity for photovoltaic capacity and station;

2, the present invention adopts mean effective value method to suppress the uncertainty of different operating mode operations to photovoltaic system demand, can accurately calculate transformer station's photovoltaic capacity;

3, the present invention can realize transformer station's design of energy saving and environmental protection.

Embodiment

Below invention is implemented to be further described, following examples are descriptive, are not determinate, can not limit with this protection range of invention.

Photovoltaic holds a method for determination of amount, comprises that step is as follows:

(1) set up photovoltaic capacity and the Matching Model of station by load capacity;

Conventionally, stand and refer to transformer station under normal operating condition load with load, press the principle that photovoltaic system power output is mated with transformer station load power, stand and represent by constraints below by the total capacity of loading:

$S=\underset{i=\mathrm{1,2}\·\·\·n}{\mathrm{\Σ}}{a}_i{L}_i+L$ Formula 1

In formula, S representative is load total capacity for station, a _irepresent the simultaneity factor of i kind load, L _irepresent the watt level of i kind load, and L represents constant load; Above-mentioned station can obtain by load total capacity value in Substation Design file;

(2) according to station, by the constraints of load total amount, tentatively determine photovoltaic system range of capacity; When photovoltaic system capacity mates with load with station, should satisfy condition:

R * P >=S formula 2

Wherein, R represents the year hours of operation (being determined by regional operation level, is constant) of photovoltaic system, and P represents the capacity of photovoltaic system, and by formula 1 and formula 2 simultaneous, the capacity that obtains photovoltaic system is:

$P\≥(\underset{i=1\·\·\·n}{\mathrm{\Σ}}{a}_i{L}_i+L)/R$ Formula 3

(3) set up the power match model of photovoltaic capacity and urgent operating load;

Except normal operating condition, also there is urgent running status in transformer station, now, stand and stop power supply with power supply, only have the batteries power supply that in station, direct current integrated platform provides, for transformer station's emergency episode rescue provides emergency guarantee, the accumulator battery voltage that photovoltaic system can utilize AC/DC integrated power supply to provide, the transformer station under the state of emergency provides energy resource supply, but is subject to the restriction of working voltage and short circuit current, the capacity of photovoltaic system can not be excessive, need to meet following formula requirement:

$P\≤\underset{j=1\·\·\·m}{\mathrm{\Σ}}{b}_j{L}_j$ Formula 4

Wherein, j represents the load for j kind station under the state of emergency, and m≤n;

(4) photovoltaic system capacity is determined;

Determining on the scope basis of photovoltaic system capacity, photovoltaic capacity processed to judgement with load under the state of emergency according to identical dimensional space, namely the power P of photovoltaic system is being divided into the sub-capacity p of m equivalent size, can obtain thus:

$\left\{\begin{array}{c}P=\underset{k=1\·\·\·m}{\mathrm{\Σ}}{c}_{k}p\\ p=P/n\end{array}\right.$ Formula 5

Wherein, c _krepresent the sub-capacity coefficient of photovoltaic mating with load under the state of emergency, and p presses the sub-calculation of capacity value of photovoltaic system under general running status,

In order to stabilize load under normal operating condition and the state of emergency, on the probabilistic impact of photovoltaic system capacity requirement, adopt mean effective value method Coefficient of determination c _kvalue,

? $c_k=\sqrt{{(a_k+L/R)}^2+{b_k}^2+\underset{l=k+1\·\·\·k+3}{\mathrm{\Σ}{a}_1}}/3(k=1\·\·\·m)$

The expression formula that can obtain thus photovoltaic system capacity is:

$P=p\×\underset{k=1\·\·\·j}{\mathrm{\Σ}}\sqrt{{(a_k+L/R)}^2+{b_k}^2+\underset{l=k+1\·\·\·k+3}{\mathrm{\Σ}{a}_1}}/3$ Formula 6

Adopt on the method basis of above-mentioned structure photovoltaic system capacity coefficient, adopt mean effective value method to stabilize the uncertainty that load brings because of operating condition difference, make to solve the capacity coefficient c obtaining _jboth comprised general information on load, and contained again the emergent information on load under the state of emergency, the capacity that accurately mates transformer station load and urgent operating load for transformer station's photovoltaic system has and well agrees with feature.

Claims (1)

1.Yi Zhong transformer station photovoltaic holds method for determination of amount, it is characterized in that comprising that step is as follows:

(1) set up photovoltaic capacity and the Matching Model of load capacity for station, press the principle that photovoltaic system power output mate with transformer station load power, setting up stands uses the constraints of the total amount of loading; Constraints formula is:

$S=\underset{i=\mathrm{1,2}\·\·\·n}{\mathrm{\Σ}}{a}_i{L}_i+L$ Formula 1

In formula, S representative is load total capacity for station, a _irepresent the simultaneity factor of i kind load, L _irepresent the watt level of i kind load, and L represents constant load;

(2) according to station, by the constraints of load total amount, tentatively determine photovoltaic system range of capacity; When photovoltaic system capacity mates with load with station, should satisfy condition:

R * P >=S formula 2

Wherein, R represents the year hours of operation of photovoltaic system, and P represents the capacity of photovoltaic system, and by formula 1 and formula 2 simultaneous, the range of capacity that obtains photovoltaic system is:

$P\≥(\underset{i=1\·\·\·n}{\mathrm{\Σ}}{a}_i{L}_i+L)/R$ Formula 3

(3) set up the power match model of photovoltaic capacity and urgent operating load;

When transformer station is during in urgent running status, be subject to the restriction of working voltage and short circuit current, the capacity of photovoltaic system need to meet following formula and require:

$P\≤\underset{j=1\·\·\·m}{\mathrm{\Σ}}{b}_j{L}_j$ Formula 4

Wherein, j represents the load for j kind station under the state of emergency, and m≤n;

(4) photovoltaic system capacity is determined;

Determining on the scope basis of photovoltaic system capacity, photovoltaic capacity processed to judgement with load under the state of emergency according to identical dimensional space, namely the power P of photovoltaic system is being divided into the sub-capacity p of m equivalent size, can obtain thus:

$\left\{\begin{array}{c}P=\underset{k=1\·\·\·m}{\mathrm{\Σ}}{c}_{k}p\\ p=P/n\end{array}\right.$ Formula 5

Wherein, c _krepresent the sub-capacity coefficient of photovoltaic mating with load under the state of emergency, and p is by the sub-calculation of capacity value of photovoltaic system under general running status, adopts mean effective value method Coefficient of determination c _kvalue, publicity is expressed as:

$c_k=\sqrt{{(a_k+L/R)}^2+{b_k}^2+\underset{l=k+1\·\·\·k+3}{\mathrm{\Σ}{a}_1}}/3(k=1\·\·\·m)$

Finally obtain photovoltaic system capacity, equation expression is:

$P=p\×\underset{k=1\·\·\·j}{\mathrm{\Σ}}\sqrt{{(a_k+L/R)}^2+{b_k}^2+\underset{l=k+1\·\·\·k+3}{\mathrm{\Σ}{a}_1}}/3.$