CN110880756B - Method for judging peak regulation capacity adequacy of extra-high voltage receiving-end power grid based on peak regulation coefficient - Google Patents
Method for judging peak regulation capacity adequacy of extra-high voltage receiving-end power grid based on peak regulation coefficient Download PDFInfo
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Abstract
The invention discloses a method for judging the peak regulation capacity adequacy of an extra-high voltage receiving-end power grid based on peak regulation coefficients. Initializing peak regulation rates of external electricity in an extra-high voltage receiving end power grid area and various generator sets and starting capacity of the generator sets at all times; initializing a load value and new energy power generation power of an extra-high voltage receiving end power grid at each moment; calculating a peak regulation coefficient of the extra-high voltage receiving end power grid at each moment according to the starting capacity and the peak regulation rate, normalizing the peak regulation coefficient, processing according to the load value and the new energy power generation power to obtain an equivalent load value of the extra-high voltage receiving end power grid, and further calculating the equivalent load coefficient at each moment; and calculating the deviation of the peak regulation coefficient and the equivalent load coefficient, and judging whether the extra-high voltage receiving end power grid meets the peak regulation capacity adequacy. The method considers the effects of external electricity in the extra-high voltage receiving end power grid area and various generator sets and the influence of the generated power of the new energy, and can more accurately judge the peak regulation capacity adequacy of the extra-high voltage receiving end power grid.
Description
Technical Field
The invention belongs to the technical field of power systems, and relates to a method for judging the peak regulation capacity adequacy of an extra-high voltage receiving-end power grid based on a peak regulation coefficient.
Background
With the continuous development and the gradual maturity of the ultra-high voltage transmission technology, the power resources can realize cross-region optimization coordination by means of long-distance transmission. Although the super-high voltage transmission technology in China promotes the development of long-distance trans-regional transmission and solves the problem of power demand in power receiving areas to a certain extent, large-scale extra-high voltage region external incoming calls also bring greater difficulty to peak regulation of receiving-end power grids. Meanwhile, the power generation scale of new energy resources in China is continuously enlarged, and as new energy resources such as wind power generation and photovoltaic power generation have the characteristics of intermittency, uncontrollable property, volatility and the like, errors of the existing prediction means are often large, and the peak regulation pressure of a power system is further increased due to the inverse peak regulation characteristic of wind power and the mismatching of photovoltaic power generation power and a load peak. Most of the existing peak regulation capacity judgment methods are used for judging the peak regulation capacity of a certain generator set, or simply measuring the surplus of the peak regulation capacity of a system from the aspect of peak regulation capacity balance, so that the existing peak regulation capacity judgment methods cannot meet the requirements of receiving-end power grids containing various generator sets and incoming calls outside a district.
Therefore, a method for effectively and accurately judging the peak regulation capacity adequacy of the extra-high voltage receiving-end power grid is lacked in the prior art.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a method for judging the peak regulation capacity adequacy of an extra-high voltage receiving-end power grid based on a peak regulation coefficient, which considers the starting capacity and the peak regulation rate of various generator sets of an extra-high voltage region external power grid and the receiving-end power grid and can more accurately judge the peak regulation capacity adequacy of the extra-high voltage receiving-end power grid.
The invention relates to a method for judging the peak regulation capacity margin of an extra-high voltage receiving-end power grid based on a peak regulation coefficient under the background that the peak regulation pressure of the receiving-end power grid is increased by the large-scale access of the extra-high voltage. Therefore, as shown in fig. 1, the invention adopts the following technical scheme:
and 4, calculating the deviation between the peak regulation coefficient and the equivalent load coefficient, and judging whether the extra-high voltage receiving end power grid meets the peak regulation capacity adequacy. And then, optimizing the extra-high voltage receiving end power grid according to the result of whether the peak regulation capacity adequacy is met.
In the step 1, for the i-th generator set in the extra-high voltage receiving end power grid, the following formula is adopted to calculate the ratio of the adjustable capacity to the rated capacity of the generator set as the peak regulation rate k of the generator seti：
ΔPi＝Pimax-Pimin
In the formula, kiIndicating the peak shaving rate, P, of the i-th gensetn,iIndicating rated capacity, Δ P, of the i-th gensetiIndicating the adjustable capacity, P, of the i-th generator setimaxRepresents the maximum technical power generation, P, of the i-th generator setiminRepresenting minimum skill of the i-th generating setAnd generating power.
The step 3 specifically comprises the following steps:
3.1, according to the peak shaving rate of incoming calls outside the extra-high voltage receiving end power grid area and the generated power at each moment, the peak shaving rates of various generator sets in the extra-high voltage receiving end power grid and the generated power at each moment, calculating the peak shaving coefficient of the receiving end power grid at each moment by adopting the following formula:
in the formula, gamma (t) represents the peak regulation coefficient of the extra-high voltage receiving end power grid at the time t; pg,i(t) the starting capacity of the ith generator set at the time t is represented; k is a radical ofiAnd the peak regulation rate of the ith type of generating set is represented, and the peak regulation rate of the generating set which does not participate in peak regulation, such as a nuclear generating set, is set to be 0. Pline(t) representing the power generation power of the out-of-area incoming call of the extra-high voltage receiving end power grid at the time t; k is a radical oflineThe peak regulation rate of the incoming call outside the extra-high voltage receiving end power grid is different from the peak regulation rate of a power grid generator set, the peak regulation rate of the incoming call outside the extra-high voltage area changes, the specific implementation can set the peak regulation rate according to the peak regulation characteristics of the incoming call outside the extra-high voltage area at different moments, and when the incoming call outside the extra-high voltage area is not considered to participate in peak regulation, k islineSet to 0;
3.2, based on the obtained peak regulation coefficient of the ultra-high voltage receiving end power grid at each moment, selecting the maximum value of the peak regulation coefficient in a fixed period as a reference, and calculating the normalized peak regulation coefficient by the following formula:
wherein γ (t)' represents a peak shaving coefficient after normalization at time t; gamma (t) represents the peak shaving coefficient at the time t; gamma raymaxRepresenting the maximum value of the peak shaving coefficient in the period;
3.3, calculating the equivalent load value of the extra-high voltage receiving end power grid at each moment according to the load value and the new energy power generation power, wherein the new energy power generation power is wind power generation power and photovoltaic power generation power, and calculating the equivalent load coefficient of the extra-high voltage receiving end power grid at each moment by adopting the following formula on the basis of the maximum value of the equivalent load in a fixed period:
Pd(t)'＝Pd(t)-Pwind(t)-Psolar(t)
wherein, mu (t) represents the equivalent load coefficient of the extra-high voltage receiving end power grid at the time t, Pd(t)' represents an equivalent load value of the extra-high voltage receiving end power grid at the time t; pd(t) representing an original load value of the extra-high voltage receiving end power grid at the time t; pwind(t) representing the wind power generation power of the extra-high voltage receiving end power grid at the time t; psolar(t) representing the photovoltaic power generation power value power generation power of the extra-high voltage receiving end power grid at the time t;
the step 4 specifically comprises the following steps:
calculating a difference value of two coefficients corresponding to each moment according to the peak regulation coefficient gamma (t)' and the equivalent load coefficient mu (t) obtained by processing in the step 3, and comparing the difference value with a preset coefficient difference threshold value, so as to judge whether the peak regulation capacity adequacy of the extra-high voltage receiving end power grid at each moment meets the requirement or not:
γ(t)'-μ(t)<ε
wherein epsilon is a coefficient difference threshold;
when the formula is met, the peak regulation capacity of the extra-high voltage receiving end power grid at the time t is enough to meet the requirement, otherwise, the peak regulation capacity of the extra-high voltage receiving end power grid is not enough to meet the requirement.
If the requirements are not met, a standby generator set is added, so that the peak regulation capacity of the extra-high voltage receiving end power grid can meet the available requirements, and the working reliability of the extra-high voltage receiving end power grid is optimized.
According to the method, the deviation of the peak regulation coefficient of the power grid and the equivalent load coefficient is compared with the given threshold value, whether the peak regulation capacity adequacy of the receiving-end power grid meets the requirement or not is judged, and the peak regulation capacity adequacy of the extra-high voltage receiving-end power grid can be judged more accurately.
The invention has the following beneficial effects:
the method for judging the peak shaving capacity adequacy comprehensively considers the effects of various generator sets of the receiving-end power grid and the incoming calls from outside the extra-high voltage area on the peak shaving of the power grid, simultaneously considers the influence of the power generation power of new energy on the load curve of the power grid, and can more accurately judge the peak shaving capacity adequacy of the extra-high voltage receiving-end power grid.
Drawings
FIG. 1 is a logical block diagram of the method of the present invention.
FIG. 2 is a peak regulation coefficient curve diagram of the typical Ri Zhejiang power grid of the embodiment.
FIG. 3 is a diagram illustrating the determination result of peak regulation capacity adequacy of the typical Rizhejiang power grid of the embodiment.
Attached table 1 is a plot of peak shaver rate data for each type of genset.
Attached table 2 is a data diagram of the starting capacity of various types of generator sets of a typical power grid in the Rizhjiang province and the power generation power of incoming electricity outside the extra-high voltage region.
And an attached table 3 is a typical distribution load, wind power generation power, photovoltaic power generation data and equivalent load coefficient calculation result chart of the power grid in the Rizhu river.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, the embodiment of the present invention is as follows:
for the ith generator set in the extra-high voltage receiving end power grid, the ratio of the adjustable capacity to the rated capacity of the generator set is calculated by adopting the following formula and is used as the peak regulation rate k of the generator seti：
ΔPi＝Pimax-Pimin
In the formula, kiIndicating the peak shaving rate, P, of the i-th gensetn,iIndicating rated capacity, Δ P, of the i-th gensetiIndicating the adjustable capacity, P, of the i-th generator setimaxRepresents the maximum technical power generation, P, of the i-th generator setiminAnd the minimum technical generated power of the ith type generator set is represented.
3.1, according to the peak shaving rate of incoming calls outside the extra-high voltage receiving end power grid area and the generated power at each moment, the peak shaving rates of various generator sets in the extra-high voltage receiving end power grid and the generated power at each moment, calculating the peak shaving coefficient of the receiving end power grid at each moment by adopting the following formula:
in the specific implementation, according to the peak regulation rate and the starting capacity of various types of units such as a coal-fired unit, a hydroelectric unit, a gas-fired unit, a fuel-fired unit, a pumped storage unit, a nuclear power unit and the like in the power grid of Zhejiang in 2019, 1 month, 2 days and 24 hours and the power generation power of the incoming call from outside the extra-high voltage area, the peak regulation rate of the incoming call from outside the extra-high voltage area is set to be 0.2, and the peak regulation coefficient of the power grid of Zhejiang at 24 points in the day is calculated according to the formulas (1), (2). The peak regulation rate data of each type of unit is shown in an attached table 1, the starting capacity and the power generation power of incoming electricity outside an extra-high voltage area of each type of unit are shown in an attached table 2, and the peak regulation coefficient calculation result is shown in an attached table 2.
TABLE 1
TABLE 2
And 3.2, based on the obtained peak regulation coefficients of the ultra-high voltage receiving end power grid at all times, selecting the maximum value of the peak regulation coefficients in a fixed period as a reference, and normalizing the peak regulation coefficients of all the generator sets.
And (4) calculating the normalized peak regulation coefficient according to the formula (4) by taking the maximum value of the peak regulation coefficients calculated by the Zhejiang power grid 2019 in 1 month, 2 days and 24 hours as a reference.
3.3, calculating the equivalent load value of the extra-high voltage receiving end power grid at each moment according to the load value and the new energy power generation power, wherein the new energy power generation power is wind power generation power and photovoltaic power generation power, and calculating the equivalent load coefficient of the extra-high voltage receiving end power grid at each moment by adopting the following formula on the basis of the maximum value of the equivalent load in a fixed period:
Pd(t)'＝Pd(t)-Pwind(t)-Psolar(t)
and calculating the equivalent load coefficient of 24 points on the day according to the unified load, the wind power generation power and the photovoltaic power generation power of 24h in 1 month, 2 days and 2019 of the Zhejiang power grid according to the formulas (5) and (6). The load, the wind power generation power, the photovoltaic power generation data and the equivalent load coefficient calculation result are shown in an attached table 3.
TABLE 3
And 4, calculating the deviation between the peak regulation coefficient and the equivalent load coefficient, and judging whether the extra-high voltage receiving end power grid meets the peak regulation capacity adequacy.
Calculating a difference value of two coefficients corresponding to each moment according to the normalized peak regulation coefficient gamma (t)' and the equivalent load coefficient mu (t), and comparing the difference value with a preset coefficient difference threshold value, so as to judge whether the peak regulation capacity adequacy of the extra-high voltage receiving end power grid at each moment meets the requirement: γ (t)' - μ (t) < ε. When the formula is met, the peak regulation capacity of the extra-high voltage receiving end power grid at the time t is enough to meet the requirement, otherwise, the peak regulation capacity of the extra-high voltage receiving end power grid is not enough to meet the requirement.
According to the discrimination formula of the peak shaving capacity adequacy of the power grid given by the formula (7), the threshold epsilon is set to be 0.05, and the judgment result of the peak shaving capacity adequacy of 24 hours on the day is shown in the attached figure 3. The results showed that, on this day 9: 00-11: 00 and 13: 00-17: the phenomenon that the peak regulation capacity of the Zhejiang power grid is insufficient in 00 two periods, and the other times meet the requirement of the adequacy, so that the result meets the actual condition of the Zhejiang power grid, and the rationality and the effectiveness of the judging method are verified.
Under the condition that the requirements are not met, a standby generator set is added in the extra-high voltage receiving end power grid in the concrete implementation, so that the peak shaving capacity adequacy of the extra-high voltage receiving end power grid meets the available requirements, and the working reliability of the extra-high voltage receiving end power grid is optimized.
Claims (3)
1. A method for judging the peak regulation capacity adequacy of an extra-high voltage receiving end power grid based on peak regulation coefficients is characterized by comprising the following steps:
step 1, initializing peak shaving rates of external electricity of an extra-high voltage receiving end power grid area and various generator sets and starting capacity of the generator sets at all times;
step 2, initializing a load value and new energy power generation power of the extra-high voltage receiving end power grid at each moment;
step 3, calculating a peak regulation coefficient of the extra-high voltage receiving end power grid at each moment according to the starting capacity and the peak regulation rate, normalizing the peak regulation coefficient, processing according to the load value and the new energy power generation power to obtain an equivalent load value of the extra-high voltage receiving end power grid, and further calculating the equivalent load coefficient at each moment;
the step 3 specifically comprises the following steps:
3.1, according to the peak shaving rate of incoming calls outside the extra-high voltage receiving end power grid area and the generated power at each moment, the peak shaving rates of various generator sets in the extra-high voltage receiving end power grid and the starting capacity at each moment, calculating the peak shaving coefficient of the receiving end power grid at each moment by adopting the following formula:
in the formula, gamma (t) represents the peak regulation coefficient of the extra-high voltage receiving end power grid at the time t; pg,i(t) the starting capacity of the ith generator set at the time t is represented; k is a radical ofiIndicating the peak shaving rate, P, of the i-th gensetline(t) representing the power generation power of the out-of-area incoming call of the extra-high voltage receiving end power grid at the time t; k is a radical oflineThe peak shaving rate of the out-of-area incoming call of the extra-high voltage receiving end power grid is represented;
3.2, based on the obtained peak regulation coefficient of the ultra-high voltage receiving end power grid at each moment, selecting the maximum value of the peak regulation coefficient in a fixed period as a reference, and calculating the normalized peak regulation coefficient by the following formula:
wherein γ (t)' represents a peak shaving coefficient after normalization at time t; gamma (t) represents the peak shaving coefficient at the time t; gamma raymaxRepresenting the maximum value of the peak shaving coefficient in a fixed period;
3.3, calculating the equivalent load value of the extra-high voltage receiving end power grid at each moment according to the load value and the new energy power generation power, and calculating the equivalent load coefficient of the extra-high voltage receiving end power grid at each moment by using the following formula on the basis of the maximum value of the equivalent load in a fixed period:
Pd(t)'＝Pd(t)-Pwind(t)-Psolar(t)
wherein, mu (t) represents the equivalent load coefficient of the extra-high voltage receiving end power grid at the time t, Pd(t)' represents an equivalent load value of the extra-high voltage receiving end power grid at the time t; pd(t) representing an original load value of the extra-high voltage receiving end power grid at the time t; pwind(t) representing the wind power generation power of the extra-high voltage receiving end power grid at the time t; psolar(t) representing the photovoltaic power generation power of the extra-high voltage receiving end power grid at the time t;
and 4, calculating the deviation between the peak regulation coefficient and the equivalent load coefficient, and judging whether the extra-high voltage receiving end power grid meets the peak regulation capacity adequacy.
2. The method for judging the peak regulation capacity adequacy of the extra-high voltage receiving-end power grid based on the peak regulation coefficient according to claim 1, is characterized in that: in the step 1, for the i-th generator set in the extra-high voltage receiving end power grid, the following formula is adopted to calculate the ratio of the adjustable capacity to the rated capacity of the generator set as the peak regulation rate k of the generator seti：
ΔPi＝Pimax-Pimin
In the formula, kiIndicating the peak shaving rate, P, of the i-th gensetn,iIndicating rated capacity, Δ P, of the i-th gensetiIndicating the adjustable capacity, P, of the i-th generator setimaxRepresents the maximum technical power generation, P, of the i-th generator setiminAnd the minimum technical generated power of the ith type generator set is represented.
3. The method for judging the peak regulation capacity adequacy of the extra-high voltage receiving-end power grid based on the peak regulation coefficient according to claim 1, is characterized in that: the step 4 specifically comprises the following steps:
calculating a difference value of two coefficients corresponding to each moment according to the peak regulation coefficient gamma (t)' and the equivalent load coefficient mu (t) obtained by processing in the step 3, and comparing the difference value with a preset coefficient difference threshold value, so as to judge whether the peak regulation capacity adequacy of the extra-high voltage receiving end power grid at each moment meets the requirement or not:
γ(t)'-μ(t)<ε
wherein epsilon is a coefficient difference threshold;
when the formula is met, the peak regulation capacity of the extra-high voltage receiving end power grid at the time t is enough to meet the requirement, otherwise, the peak regulation capacity of the extra-high voltage receiving end power grid is not enough to meet the requirement.
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