CN107798427B - Construction method of extra-high voltage power transmission grid structure scheme of large-scale energy base - Google Patents
Construction method of extra-high voltage power transmission grid structure scheme of large-scale energy base Download PDFInfo
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Abstract
本发明公开了一种大规模能源基地特高压电力送出电网结构方案的构建方法，包括以下步骤：1)构建大规模能源基地特高压电力送出电网初始模型；2)确定2‑3个直流背靠背的容量值；3)确定2‑3个直流背靠背的交流落点方案；4)得若干规划网架，然后将各规划网架作为初选方案构建初选方案集；5)对各规划网架进行电学性能分析；6)当不满足预设要求时，则从初选方案集中删除该规划网架；7)当经步骤6)处理后初选方案集为空集时，则转至步骤2)；否则，则转至步骤8)；8)对初选方案集中的各规划网架进行经济性分析；9)根据所述多目标优化规划模型选取最优规划网架，该方法能够综合电学性能及经济性实现电网结构方案的构建。
The invention discloses a construction method of a large-scale energy base ultra-high voltage power transmission grid structure scheme, comprising the following steps: 1) constructing an initial model of a large-scale energy base ultra-high voltage power transmission grid; capacity value; 3) Determine the 2-3 DC back-to-back AC placement plans; 4) Obtain a number of planned grids, and then use each planned grid as a preliminary selection scheme to construct a preliminary selection scheme set; 5) Carry out Electrical performance analysis; 6) When the preset requirements are not met, delete the planning grid from the preliminary selection scheme set; 7) When the preliminary selection scheme set is empty after processing in step 6), go to step 2) otherwise, go to step 8); 8) carry out economic analysis to each planning grid in the primary selection scheme; 9) select the optimal planning grid according to the multi-objective optimization planning model, this method can integrate electrical performance And the economic realization of the construction of the power grid structure scheme.
Description
Technical Field
The invention belongs to the field of power grid development and planning, and relates to a construction method of a structural scheme of an extra-high voltage power transmission power grid of a large-scale energy base.
Background
Energy resources in China are extremely unbalanced in distribution, nearly two thirds of hydropower can be developed in China to be distributed in the three provinces (regions) of Sichuan, Yunnan and Tibet in the west, nearly two thirds of reserves of coal are concentrated in the three provinces (regions) of Shanxi, inner Mongolia and Shaanxi in the north and the northwest of China, and large hydropower bases and coal-electricity bases are formed. The distribution of energy resources and economic development in China are in a reverse distribution layout, and the necessity of large-scale flow of energy and power across regions is determined. The transmission capacity of an extra-high voltage line is limited by the stability level of the grid, the load level and the transmission distance. When long-distance and large-capacity power transmission is completed through an extra-high voltage line, the transmission capacity of the transmission lines mainly depends on the stability limit of the line, and the stability limit of the long-distance transmission lines is usually lower due to the lack of enough power support in the middle, so that the limitation is brought to the transmission capacity of the extra-high voltage line. Therefore, for large capacity, long distance transportation of large scale coal electric bases, the transportation requirements may not be met with the use of ultra high voltage lines alone.
The extra-high voltage line has the characteristics of high voltage level, long power transmission distance and large power transmission capacity, a power transmission channel is added after the extra-high voltage line is put into operation, a grid structure is reinforced, the stability level of a power transmission section can be obviously improved, the power supply of a region is guaranteed, and the capability of optimizing configuration resources of a power grid is improved. Meanwhile, when the power grid fails, the extra-high voltage power grid can enhance the power flow transfer capacity of the power grid and obviously enhance the capacity of resisting the impact of multiple serious faults of the power grid, and the extra-high voltage power grid is an important and effective way for utilizing clean energy and preventing air pollution.
After the ultra-high voltage project is built and put into operation, the interconnection mode of the ultra-high voltage transformer substation and the original sending end ultra-high voltage power grid has certain influence on the short circuit current level, the transient stability and the power transmission capacity of an outgoing section of the power grid. In the initial stage of extra-high voltage construction, a grid structure is not formed, and if an extra-high voltage transformer substation and a transmission end extra-high voltage power grid are interconnected by adopting an alternating current circuit, the short-circuit current level of the original transmission end power grid can exceed the switch interruption capacity, and adverse effects can be brought to the transmission capacity of the transmission end power grid; if the ultra-high voltage transformer substation is not interconnected with the transmission end ultra-high voltage power grid, the voltage supporting capability is weak, and the possibility of limited power output of the energy base due to weak transient stability capability also exists.
With the development of an extra-high voltage power grid, an extra-high voltage alternating current and direct current series-parallel large-scale long-distance power transmission network is gradually formed, and a complex power grid structure is gradually formed at the power transmission end and the power receiving end and faces various technical problems. The reasonable planning of the extra-high voltage power transmission power grid structure of the large-scale energy base is to avoid the situation that the short-circuit current exceeds the breaking capacity of a related breaker and improve the transmission capacity, and is a difficult problem to be solved in the planning stage of the power grid at the transmission end, and meanwhile, the economy of the power grid is also considered in the planning stage of the power grid, so that a construction method of the power grid structure scheme comprehensively considering the electrical performance and the economy is required to be designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for constructing a large-scale energy base extra-high voltage power transmission power grid structure scheme, which can realize the construction of the power grid structure scheme by integrating electrical performance and economy.
In order to achieve the aim, the method for constructing the structural scheme of the extra-high voltage power transmission grid of the large-scale energy base comprises the following steps:
1) constructing an initial model of an extra-high voltage power transmission grid of a large-scale energy base;
2) carrying out power and electric quantity balance analysis according to a power supply and load development plan of a sending end power grid, determining the surplus power sending demand of the sending end power grid, and then determining 2-3 direct current back-to-back capacity values according to the surplus power sending demand of the sending end power grid, a direct current back-to-back engineering system, equipment set design and equipment manufacturing process level;
3) determining 2-3 direct-current back-to-back alternating-current drop point schemes according to power grid construction planning of a sending-end power grid and construction time sequences of an ultrahigh-voltage transformer substation;
4) according to the 2-3 direct current back-to-back capacity values determined in the step 2) and the 2-3 direct current back-to-back alternating current drop point schemes determined in the step 3), connecting different ultrahigh voltage alternating current drop points with direct current back-to-back converter stations with different capacities to obtain a plurality of planning net racks, and then constructing a primary selection scheme set by taking each planning net rack as a primary selection scheme;
5) analyzing the electrical performance of each planning net rack in the primary selection scheme set constructed in the step 4);
6) judging whether the electrical performance of each planning network frame in the primary selection scheme set meets the preset requirement, and deleting the planning network frame from the primary selection scheme set when the electrical performance of any planning network frame does not meet the preset requirement;
7) judging whether the initially selected scheme set processed in the step 6) is an empty set, and turning to the step 2) when the initially selected scheme set processed in the step 6) is the empty set; when the initially selected scheme set is not an empty set after the processing in the step 6), turning to a step 8);
8) carrying out economic analysis on each planned net rack in the primary selection scheme set;
9) and constructing a multi-objective optimization planning model taking the performance and the economy of the power grid as indexes, then selecting an optimal planning grid frame from planning grid frames in the primary selection scheme set according to the multi-objective optimization planning model, and then sending the optimal planning grid frame out of the power grid structure scheme as the extra-high voltage power of the large-scale energy base.
The specific operation of the step 1) is as follows: according to construction and production information of an ultra-high voltage transformer substation, a matched power supply of the ultra-high voltage transformer, a transmission end grid network frame and a generator set in a planned horizontal year, and with transformer substation capacity, short-circuit current level, line transmission capacity and grid transient stability as constraint conditions, an ultra-high voltage power transmission grid initial model of a large-scale energy base is constructed according to data information of a generator, a load, a balance node, a transformer and a line in a grid.
The specific operation of the step 5) is as follows: and (3) carrying out static safety analysis, short circuit current level evaluation, tide distribution characteristic analysis, transient stability characteristic analysis and transmission capacity analysis on each planning network frame in the primary selection scheme set constructed in the step 4).
The specific operation of step 8) is: and calculating the total engineering construction investment, operation and maintenance cost, investment recovery period and power transmission engineering economy of each planned net rack in the primary selection scheme set.
The specific operation of step 6) is: and judging whether the static safety, the short-circuit current level, the tide distribution characteristic, the transient stability characteristic and the transmission capacity of the transmission end power grid of each planning grid in the primary selection scheme set all meet preset requirements, and deleting the planning grid from the primary selection scheme set when the static safety, the short-circuit current level, the tide distribution characteristic, the transient stability characteristic and the transmission capacity of the transmission end power grid of any planning grid do not all meet the preset requirements.
The specific operation of constructing the multi-objective optimization planning model taking the power grid performance and the economy as indexes in the step 9) is as follows: and (3) weighting the performance and the economy of the power grid to construct a multi-objective optimization planning model.
The invention has the following beneficial effects:
the construction method of the structural scheme of the extra-high voltage power transmission grid of the large-scale energy base has the advantages that during specific operation, determining 2-3 direct current back-to-back capacity values according to the surplus power sending demand of a sending end power grid, a direct current back-to-back engineering system, equipment complete set design and equipment manufacturing process level, determining 2-3 direct current back-to-back alternating current point placement schemes according to the power grid construction plan of the sending end power grid and the construction time sequence of an ultrahigh voltage transformer substation, thereby forming a plurality of planning net racks, analyzing the electrical property of each planning net rack, deleting the planning net racks with the electrical property not meeting the requirement, then, each planning net rack is subjected to economic analysis, a multi-objective optimization planning model is constructed by taking the electrical performance and the economic performance of the power grid as indexes, the optimal planning net rack is selected, and the situation that the electrical performance of the selected planning net rack does not meet the requirement is avoided. In addition, the direct current back-to-back converter stations with different capacities are interconnected with different ultrahigh voltage alternating current drop points, so that adverse effects of a planning grid frame on the short circuit current level of the original sending-end power grid are avoided, the control is flexible, and the method and the device can be applied to multiple scenes and multiple operation modes.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a power grid structure scheme in which extra-high voltages are interconnected with a sending-end extra-high voltage power grid through direct current back-to-back connections;
fig. 3 is a schematic diagram of a structural scheme of an extra-high voltage power transmission grid of a transmission-end power grid.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the method for constructing the structural scheme of the extra-high voltage power transmission grid of the large-scale energy base includes the following steps:
1) constructing an initial model of an extra-high voltage power transmission grid of a large-scale energy base;
the specific operation of the step 1) is as follows: according to construction and production information of an ultra-high voltage transformer substation, a matched power supply of the ultra-high voltage transformer, a transmission end grid network frame and a generator set in a planned horizontal year, and with transformer substation capacity, short-circuit current level, line transmission capacity and grid transient stability as constraint conditions, an ultra-high voltage power transmission grid initial model of a large-scale energy base is constructed according to data information of a generator, a load, a balance node, a transformer and a line in a grid.
2) Carrying out power and electric quantity balance analysis according to a power supply and load development plan of a sending end power grid, determining the surplus power sending demand of the sending end power grid, and then determining 2-3 direct current back-to-back capacity values according to the surplus power sending demand of the sending end power grid, a direct current back-to-back engineering system, equipment set design and equipment manufacturing process level;
3) determining 2-3 direct-current back-to-back alternating-current drop point schemes according to power grid construction planning of a sending-end power grid and construction time sequences of an ultrahigh-voltage transformer substation;
4) according to the 2-3 direct current back-to-back capacity values determined in the step 2) and the 2-3 direct current back-to-back alternating current drop point schemes determined in the step 3), connecting different ultrahigh voltage alternating current drop points with direct current back-to-back converter stations with different capacities to obtain a plurality of planning net racks, and then constructing a primary selection scheme set by taking each planning net rack as a primary selection scheme;
5) analyzing the electrical performance of each planning net rack in the primary selection scheme set constructed in the step 4);
the specific operation of the step 5) is as follows: and (3) carrying out static safety analysis, short circuit current level evaluation, tide distribution characteristic analysis, transient stability characteristic analysis and transmission capacity analysis on each planning network frame in the primary selection scheme set constructed in the step 4).
6) Judging whether the electrical performance of each planning network frame in the primary selection scheme set meets the preset requirement, and deleting the planning network frame from the primary selection scheme set when the electrical performance of any planning network frame does not meet the preset requirement;
the specific operation of step 6) is: and judging whether the static safety, the short-circuit current level, the tide distribution characteristic, the transient stability characteristic and the transmission capacity of the transmission end power grid of each planning grid in the primary selection scheme set all meet preset requirements, and deleting the planning grid from the primary selection scheme set when the static safety, the short-circuit current level, the tide distribution characteristic, the transient stability characteristic and the transmission capacity of the transmission end power grid of any planning grid do not all meet the preset requirements.
7) Judging whether the initially selected scheme set processed in the step 6) is an empty set, and turning to the step 2) when the initially selected scheme set processed in the step 6) is the empty set; when the initially selected scheme set is not an empty set after the processing in the step 6), turning to a step 8);
8) carrying out economic analysis on each planned net rack in the primary selection scheme set;
the specific operation of step 8) is: and calculating the total engineering construction investment, operation and maintenance cost, investment recovery period and power transmission engineering economy of each planned net rack in the primary selection scheme set.
9) And constructing a multi-objective optimization planning model taking the performance and the economy of the power grid as indexes, then selecting an optimal planning grid frame from planning grid frames in the primary selection scheme set according to the multi-objective optimization planning model, and then sending the optimal planning grid frame out of the power grid structure scheme as the extra-high voltage power of the large-scale energy base.
The specific operation of constructing the multi-objective optimization planning model taking the power grid performance and the economy as indexes in the step 9) is as follows: and (3) weighting the performance and the economy of the power grid to construct a multi-objective optimization planning model.
In fig. 2, ABCDEFH is a 1000kV substation, a and B represent extra-high voltage stations of a transmitting-end grid, C represents an intermediate station, D represents an extra-high voltage station of a receiving-end grid, a1, B1, and C1 are extra-high voltage substations, G1-G9 are generator sets, T1-T9 are transformers, L1 and L2 are receiving-end loads, and the extra-high voltage substation B1 are interconnected back-to-back by direct current.
Example one
According to a planning report of a certain transmitting end power grid, the construction progress of an ultra-high voltage power grid in the horizontal year and the production condition of a generator of the transmitting end ultra-high voltage power grid are clearly researched, abundant power of the transmitting end power grid is preliminarily determined through power and electric quantity balance, and then the capacity of direct current back-to-back is preliminarily set to be 1000MW and 1500MW respectively. According to the construction planning of the grid structure of the ultra-high voltage transmission end and the consideration of the sustainability of the planning scheme, the determined direct-current back-to-back alternating-current falling points can be initially selected as an ultra-high voltage transformer substation A or E in the graph 3, so that the structural scheme set of the ultra-high voltage power transmission grid of the large-scale energy base can be constructed as follows:
the first scheme is as follows: the direct current back-to-back capacity is 1000MW, and the direct current back-to-back alternating current drop point is a transformer substation A;
scheme II: the direct current back-to-back capacity is 1000MW, and the direct current back-to-back alternating current drop point is a transformer substation E;
the third scheme is as follows: the direct current back-to-back capacity is 1500MW, and a direct current back-to-back alternating current drop point is a transformer substation A;
and the scheme is as follows: the direct current back-to-back capacity is 1500MW, and the direct current back-to-back alternating current drop point is a transformer substation E.
Static safety analysis, short circuit current level analysis, transient stability check and outgoing transmission capacity analysis are carried out on the first scheme to the fourth scheme, the economy of each scheme is evaluated, and the results are listed in table 1.
TABLE 1
And (3) sequencing the planning schemes by adopting a multi-attribute decision method to obtain the programming schemes with the sequence of the degrees of merits of the planning schemes of F3 & gt F4 & gt F1 & gt F2, wherein the symbol '>' indicates 'superior', and the optimal programming scheme is scheme III, namely the direct-current back-to-back capacity is 1500MW, and the direct-current back-to-back alternating-current drop point is the programming scheme of the transformer substation A.
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