CN114239942A - Control method of interconnected power grid with partitioned balance and overall coordination - Google Patents
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Abstract
The invention discloses a control method of an interconnected power grid with partitioned balance and overall coordination, which comprises the following steps: s1, establishing a balance model with the new energy permeability as a variable under the provincial power grid; s2, constructing a membership function of the new energy power generation permeability and the proportion of the self-balancing time period; s3, optimizing the membership function bandwidth characteristics through deep peak regulation, energy storage and trans-provincial and trans-regional mutual aid measures; s4, establishing an interconnected provincial power grid balance model and an integral membership function of the interconnected power grid based on fuzzy mathematics, and quantifying the balance risk of the interconnected power grid; and S5, outputting a new energy permeability bearing interval of the power grid under the given membership degree based on the overall membership function of the interconnected power grid, developing the plan optimization of the tie line aiming at the time period with the maximum balance risk, and improving the balance membership degree of the power grid. According to the control method, a provincial-level and interconnected provincial-level power grid balance probabilistic system is constructed, the contradiction between supply protection and new energy consumption is relieved, and the power grid balance capacity is improved.
Description
Technical Field
The invention relates to a control method of an interconnected power grid, in particular to a control method of an interconnected power grid with partitioned balance and overall coordination.
Background
The novel power system with new forms of energy as the main part is the key that realizes zero carbon power production, and along with the continuous increase of new forms of energy installation, power system volatility is constantly increasing, and conventional unit start-up capacity is constantly compressed in addition, and the regulating power of system constantly weakens, and peak shaver and guarantor contradiction constantly increase.
The power grid interconnection can increase the power system regulation capacity, the power grid power balance level is increased by utilizing the characteristics of different cross-time zones and regional source loads, and the power grid balance is mainly divided into three parts: the new energy prediction error is reduced, the new energy output confidence level is considered, and a random production simulation method is adopted.
Considering the characteristic that the prediction accuracy is reduced due to the fact that meteorological factors are increased along with the time, the new energy source reduction prediction method is suitable for the ultra-short-term power generation planning and is not suitable for the long-term power generation planning. The new energy confidence level method is considered, inter-provincial support capability of the trans-regional power grid cannot be considered, only the overall level of the trans-regional power grid is considered, the province is not considered as a basic unit, and compared with a power grid scheduling principle of 'hierarchical zoning', an optimization space exists with actual scheduling. Due to the defect that the highest load peak and the highest photovoltaic peak cannot appear in the same time period, although a literature [ wind power-photovoltaic-photothermal-hydroelectric-thermal power-energy storage multi-energy power system time sequence random production simulation ] is optimized through a time sequence curve, the problem of high dependence on prediction still exists, and in addition, the random production simulation has the problem that the error is large and the actual value of production operation cannot be approached.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a control method of an interconnected power grid, which realizes partition balance overall coordination and improves the balance level of the power grid.
The technical scheme is as follows: the control method comprises the following steps:
s1, establishing a balance model with the new energy permeability as a variable under the provincial power grid;
s2, constructing a membership function of the new energy power generation permeability and the proportion of the self-balancing time period;
s3, optimizing the bandwidth characteristics of the membership function through deep peak regulation, energy storage and trans-provincial and trans-regional mutual aid measures, and increasing a self-balancing interval;
s4, establishing an interconnected provincial power grid balance model and an integral membership function of the interconnected power grid based on fuzzy control, and quantifying the balance risk of the interconnected power grid;
and S5, outputting a new energy permeability bearing interval of the power grid under the given membership degree based on the overall membership function of the interconnected power grid, developing the plan optimization of the tie line aiming at the time period with the maximum balance risk, and improving the balance membership degree of the power grid.
Further, in the step S1,
when P is presentNew energy resource＞PLoad(s)+PDirect current-PThe minimum of the conventional unit is adjustableWhen the energy is used, the new energy is limited;
when P is presentNew energy resource＜PLoad(s)+PDirect current-PMaximum adjustable of conventional machine setWhen the power is not available, the power is not available; wherein, PNew energy resourceFor new energy power value, PLoad(s)As load power value, PDirect currentFor power values of DC transmission systems, PThe minimum of the conventional unit is adjustableThe minimum adjustable power value is the minimum adjustable power value of the conventional unit.
Further, in step S2, the expression of the membership function is:
wherein a is a characteristic parameter of the self-balancing interval width, c is a middle value of the self-balancing interval width, x is the new energy power generation permeability, and x1 and x2 are the minimum value and the maximum value of the new energy power generation permeability of which the power grid can completely self-balance.
Further, in step S4, the overall membership function expression of the interconnected grid is as follows:
wherein "" V "" represents "" or "", "" A "" represents "" and "", fA(x)，fB(y)，fAB(z) are membership functions of the balance results of the interconnected power networks of province A, province B and province AB respectively; the expression for f (y | x) to be A, B province joint distribution of the balanced result is:
wherein (a)x,cx)、(ay,cy) Characteristic parameter of bell-shaped distribution in A, B province, ax、ayCharacteristic parameters of width of self-balancing interval of A, B provincesx、cyIs a characteristic parameter of the interval mean value capable of self-balancing; δ is a correlation coefficient of A, B provinces.
Further, in step S5, the expression of the new energy permeability that the power grid can bear is as follows:
where f is a given degree of membership.
Compared with the prior art, the invention has the following remarkable effects: 1. according to the method, a balance model with new energy permeability as a variable under a provincial power grid is established, the power shortage state is quantified, a balance probabilistic membership function is obtained by establishing an independent power grid balance probabilistic model, and reference is provided for inter-provincial and inter-regional mutual aid, unit deep adjustment, energy storage, load side response and self-balancing interval promotion; 2. on the basis of the analysis of the balance characteristics of the independent power grid, the membership function of each province is integrated and analyzed through fuzzy mathematics to guide the power grid adjustment strategy, so that the balance bearing capacity of new energy is improved, and overall balance is guided.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a diagram of the characteristics of the novel power system;
FIG. 3 is a diagram illustrating a bell-shaped membership function of the balancing result of the independent provincial power grid;
FIG. 4 is a schematic diagram of power balance characteristics under variation of bell-shaped membership parameter;
FIG. 5 is a diagram of a joint distribution function of interconnected provincial power grids;
fig. 6(a) is a statistical distribution of the proportion history of new energy in gansu in accordance with the embodiment of the present invention,
(b) the method is characterized by comprising the following steps of (1) carrying out historical statistical distribution on the ratio of new Qinghai energy to new energy;
FIG. 7(a) is a schematic diagram of a Gansu bell distribution function in an embodiment of the present invention,
(b) is a schematic diagram of a Qinghai bell-shaped distribution function in the embodiment of the invention;
FIG. 8 is a combined bell-shaped distribution function of the Ganzan-Qing interconnected network according to the embodiment of the present invention;
FIG. 9(a) is a comparison between before and after optimization of a cyan-licorice connecting line in an example of the present invention,
(b) is a comparison chart of the Qishao Qingyu before and after adjustment in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Fig. 1 shows an overall flow chart of the present invention. The novel power system has outstanding balance probability characteristics, and as shown in fig. 2, the invention provides a power balance mechanism practice scheme of the interconnected provincial power grid under the novel power system based on fuzzy mathematics for relieving the influence caused by new energy fluctuation under the novel power system and improving the energy balancing capability of the interconnected power grid. The method mainly comprises the following steps:
s1, establishing a balance model with the new energy permeability as a variable under the provincial power grid according to the historical data of the new energy load and the like, and analyzing the relation between the power grid regulation bandwidth and the new energy electricity limiting and power gap according to the balance model, wherein the function is shown as a membership function of the independent provincial power grid balance result in fig. 3.
And S2, taking the new energy power generation permeability as an independent variable and the self-balanceable time period ratio as a membership degree, constructing balanced probability bell-shaped distribution of the independent power grid under different new energy permeabilities, and researching the optimization influence of deep peak regulation, energy storage and trans-provincial and trans-regional mutual economic measures on the bell-shaped membership degree function bandwidth characteristics (namely, self-balanceable interval) a, as shown in FIG. 4.
S3, on the basis of constructing the balanced probabilistic membership function of the independent power grid, traversing and combining the membership of the independent power grid based on a fuzzy mathematical theory to obtain the integral membership function of the interconnected power grid, as shown in FIG. 5, realizing mutual economy, improving the balance bearing capacity of new energy resources and realizing the overall balance of electric power guidance in a larger space.
And S4, establishing an interconnected provincial power grid balance model and an integral membership function of the interconnected power grid based on fuzzy mathematics, and quantifying the balance risk of the interconnected power grid.
And S5, outputting a new energy permeability bearing interval of the power grid under the given membership degree based on the overall membership function of the interconnected power grid, developing tie line plan optimization aiming at the time period with the maximum balance risk, and improving the balance membership degree of the power grid.
Taking new energy as an example, the detailed implementation steps are as follows:
step one, inputting historical data such as new energy load and the like, establishing a balance model taking new energy permeability as a variable under a provincial power grid,when P is presentNew energy resource＞PLoad(s)+PDirect current-PThe minimum of the conventional unit is adjustableWhen the energy is used, the new energy is limited; when P is presentNew energy resource＜PLoad(s)+PDirect current-PMaximum adjustable of conventional machine setWhen the power is not available, the power is not available; wherein, PNew energy resourceFor new energy power value, PLoad(s)As load power value, PDirect currentFor power values of DC transmission systems, PThe minimum of the conventional unit is adjustableThe minimum adjustable power value is the minimum adjustable power value of the conventional unit.
Step two, taking the new energy power generation permeability x as an independent variable, taking the self-balancing time period occupation ratio as a membership degree, wherein the balance probability distribution characteristics under different new energy permeabilities are distributed in a bell shape, and the membership degree function f (x, a, c) is shown as the formula (1):
in the formula (1), a is a membership function width characteristic parameter, c is a membership function width intermediate value, and x1 and x2 are respectively the minimum value and the maximum value of the new energy power generation permeability of which the power grid can be completely self-balanced.
And step three, increasing the maximum and minimum adjusting capacity of the power grid by implementing the deep peak regulation, energy storage configuration and inter-economic and inter-regional mutual assistance measures of the unit, and meeting the adjusting requirement of new energy ratio in the fluctuation in a larger range, thereby optimizing the bell-shaped membership function bandwidth characteristic a and increasing the self-balancing interval.
Step four, establishing a balance mechanism of the interconnected provincial power grid based on fuzzy mathematics by considering factors such as mutual aid capability and correlation among local networks, wherein the overall membership function of the interconnected power grid is shown as the formula (2):
in the formula (2), "" V "" represents "or", "" A "represents" and ", fA(x)，fB(y)，fAB(z) is respectively A province, B province and AB interconnected networkMembership function of the balanced result of (a); obtaining the bell-shaped distribution of the whole-network balance result through fuzzy combination operation of the province results, wherein f (y | x) is A, B province balance result joint distribution, and the formula (3) is as follows:
in the formula (3), (a)x,cx)、(ay,cy) Characteristic parameter of bell-shaped distribution in A, B province, ax、ayCharacteristic parameters of width of self-balancing interval of A, B provincesx、cyIs a characteristic parameter of the interval mean value capable of self-balancing; δ is a correlation coefficient of A, B provinces.
Step five, based on the overall membership function of the interconnected power grid in the formula (2), under the given membership f, the permeability interval of the new energy borne by the power grid is as shown in the formula (4):
in the formula (4), the new energy permeability carrying interval is directly related to the characteristic parameter a of the self-balancing interval width of the membership function. a isz-axCan reflect the difference of the whole and local power grid bearing capacity, aZAnd the characteristic parameters of the power grid width after AB combination.
In order to verify the feasibility and the effectiveness of the power balance mechanism practice scheme of the interconnected provincial power grid under the novel fuzzy mathematics-based power system, the actual balance data of the Gansu and Qinghai power grids 2021 year first half are taken as an example, and membership function fitting is carried out on the balance conditions of the Gansu and Qinghai power grids. Gansu and Qinghai power grids new energy occupation ratio historical statistical distribution are respectively shown in fig. 6(a) and fig. 6 (b), bell-shaped distribution is respectively shown in fig. 7(a) and fig. b, because Qinghai water and electricity occupation ratio is large, self-balancing capability is strong, Gansu is mainly based on thermal power, heat supply units are large, average deep regulation capability is only 42%, width characteristic parameters a of membership function obtained by matching Gansu and Qinghai are respectively 0.30 and 0.22, and the width of Qinghai function is larger than Gansu. By means of fuzzy number merging operation, when inter-provincial mutual aid is not considered, the width characteristic parameter of the combined bell-shaped distribution function of the sweet-green interconnected power grid is 0.28 after the sweet and green are integrated as shown in fig. 8, and the width characteristic parameter is between the width characteristic parameters of the sweet and green. If the mutual assistance of the two provinces is considered, the width characteristic parameter after integration is 0.32, and the capacity of bearing new energy is obviously enhanced. And carrying out monthly analysis on the power shortage condition in the summer period of 2021 years by using the membership function, and quantitatively evaluating a balance probabilistic result. Based on the data of power generation, monthly prediction of load, outgoing power plan and the like, the new energy power generation permeability in each time period in the whole month can be calculated, the permeability is respectively substituted into membership functions of the gan, the qing and the interconnected power grids, the membership in each time period can be obtained, and the number of days of power shortage with the membership smaller than a certain threshold value is further counted. Taking the monthly balance result as an example, if inter-provincial support is not considered, the number of electricity shortage days with Gansu membership less than 0.95 is 13 days, and the number of electricity shortage days with Qinghai membership less than 0.95 is 4 days; according to the quantitative evaluation result, firstly, a Ganqing mutual-assistance curve is optimized, the number of power shortage days with the membership degree of less than 0.95 is reduced to 2 days, and further, direct-current plan adjustment is carried out at the maximum power shortage risk time period, so that the problem of power shortage is solved, and larger space balance is realized. On the basis of deep adjustment, energy storage and load side response of a unit, the power of the green-licorice connecting line is dynamically adjusted through overall network planning in the northwest power grid, the inter-provincial mutual aid capacity is fully exerted, and the green-licorice connecting line in the region is adjusted as shown in a figure 9 (a); the direct current power is dynamically adjusted outside, the maximum power shortage risk period is reduced by 50 ten thousand kilowatts, and trans-regional direct current adjustment is shown in fig. 9 (b); the new energy consumption practice of the northwest power grid increases the adjustment capacity of the local power grid, enlarges the balance range of the power grid and can effectively solve the balance contradiction of power supply and power abandonment.
Claims (5)
1. A control method for a partitioned balanced integrally coordinated interconnected power grid is characterized by comprising the following steps:
s1, establishing a balance model with the new energy permeability as a variable under the provincial power grid;
s2, constructing a membership function of the new energy power generation permeability and the proportion of the self-balancing time period;
s3, optimizing the bandwidth characteristics of the membership function through deep peak regulation, energy storage and trans-provincial and trans-regional mutual aid measures, and increasing a self-balancing interval;
s4, establishing an interconnected provincial power grid balance model and an integral membership function of the interconnected power grid based on fuzzy control, and quantifying the balance risk of the interconnected power grid;
and S5, outputting a new energy permeability bearing interval of the power grid under the given membership degree based on the overall membership function of the interconnected power grid, developing the plan optimization of the tie line aiming at the time period with the maximum balance risk, and improving the balance membership degree of the power grid.
2. The method for controlling an interconnected network with partitioned balance and overall coordination according to claim 1, wherein in said step S1,
when P is presentNew energy resource＞PLoad(s)+PDirect current-PThe minimum of the conventional unit is adjustableWhen the energy is used, the new energy is limited;
when P is presentNew energy resource＜PLoad(s)+PDirect current-PMaximum adjustable of conventional machine setWhen the power is not available, the power is not available;
wherein, PNew energy resourceFor new energy power value, PLoad(s)As load power value, PDirect currentFor power values of DC transmission systems, PThe minimum of the conventional unit is adjustableThe minimum adjustable power value is the minimum adjustable power value of the conventional unit.
3. The method for controlling an interconnected network with partitioned balance and overall coordination according to claim 1, wherein in the step S2, the expression of the membership function is:
wherein a is a characteristic parameter of the self-balancing interval width, c is a middle value of the self-balancing interval width, x is the new energy power generation permeability, and x1 and x2 are the minimum value and the maximum value of the new energy power generation permeability of which the power grid can completely self-balance.
4. The method for controlling an interconnected network with partitioned balance and overall coordination according to claim 3, wherein in the step S4, the overall membership function expression of the interconnected network is as follows:
wherein "" V "" represents "" or "", "" A "" represents "" and "", fA(x)，fB(y)，fAB(z) are membership functions of the balance results of the interconnected power networks of province A, province B and province AB respectively; the expression for f (y | x) to be A, B province joint distribution of the balanced result is:
wherein (a)x,cx)、(ay,cy) Characteristic parameter of bell-shaped distribution in A, B province, ax、ayCharacteristic parameters of width of self-balancing interval of A, B provincesx、cyIs a characteristic parameter of the interval mean value capable of self-balancing; δ is a correlation coefficient of A, B provinces.
5. The method for controlling an interconnected power grid with partitioned balance and overall coordination according to claim 4, wherein in the step S5, the expression of the grid-loadable new energy permeability interval is as follows:
where f is a given degree of membership.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116505596A (en) * | 2023-06-30 | 2023-07-28 | 中国电力科学研究院有限公司 | Multi-region power system trans-regional support time sequence production simulation method and system |
| CN116505596B (en) * | 2023-06-30 | 2023-09-01 | 中国电力科学研究院有限公司 | Multi-region power system trans-regional support time sequence production simulation method and system |
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