CN113937768A - High-voltage distribution network transfer optimization method considering wiring unit and transmission blockage - Google Patents
High-voltage distribution network transfer optimization method considering wiring unit and transmission blockage Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses a high-voltage distribution network transfer optimization method considering wiring units and transmission blockage, which has the technical scheme that: acquiring the number of all line switches of the high-voltage distribution network after the main transformer station fails, and constructing a power supply recovery sub-model of the high-voltage distribution network after the main transformer station fails according to the number of the line switches; establishing a high-voltage distribution network power supply conversion optimization sub-model overloaded by a main transformer station according to the on-off state of a high-voltage distribution network line and the reverse charging of a high-voltage distribution network bus; and establishing a high-voltage distribution network transfer optimization model under the transmission resistance plug of the main transformer station together according to the power supply recovery submodel and the transfer optimization submodel of the high-voltage distribution network. According to the invention, the problem of power supply recovery after the main transformer station is in voltage loss and the problem of main transformer overload of other main transformer stations are solved through the established model, a power supply recovery scheme of a high-voltage distribution network with optimal voltage loss and a corresponding optimal power transfer scheme of main transformer overload of the main transformer stations are provided, the problem of main transformer overload of the main transformer stations is eliminated, and the safe and stable operation of a power grid is ensured.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a high-voltage distribution network transfer optimization method considering wiring units and transmission blockage.
Background
According to the current strength of quoting and quotation of some hot cities, the power grid load of the newly added city can show multi-stage increase. The existing upper and lower-level power grid new construction relates to the problems of square aspects such as power transmission corridor house removal compensation, long iron tower pouring construction period and the like, and the load increase speed of the existing upper and lower-level power grid new construction is seriously lagged behind the load increase speed of an economic development hotspot area. In the load peak period, overload of various degrees can occur in the upper-level 500kV power supply, 220/110kV power grid or 10kV power distribution network, so that the condition of large-area power transmission resistor plug occurs. It can be seen that the 'grid-load' development of the urban power grid is asynchronous, and the capacity-load ratio of the power grid is not distributed uniformly in space, which is a main reason for generating the output resistor plugs. In order to solve the problem of the resistance plug of the urban power grid, on one hand, the progress of power grid construction is continuously promoted, a plurality of newly-built substations and power transmission lines are put into operation as soon as possible, on the other hand, the optimization research on the power grid supply is deeply developed, and the transmission capacity of the existing power grid is further exploited
In a 220kV/110kV urban receiving end power grid, a topological relation exists between a 220kV station main variable load and a supplied 110kV line. When a 220kV power grid fails to cause the voltage loss of a 220kV station, 2 problems may occur at the time: 1) the problem of how to recover power supply of the 110kV station due to voltage loss of the 220kV station; 2) the problem of how to arrange load transfer due to overload of main transformers of adjacent 220kV stations is caused by partial 110kV spare power automatic switching actions caused by voltage loss of the 220kV stations.
Disclosure of Invention
The invention provides a high-voltage distribution network switching optimization method considering wiring units and transmission blockage, and the method solves the problem of power supply recovery after voltage loss of one main transformer station and the problem of main transformer overload of other main transformer stations through an established model when the main transformer station fails, provides a high-voltage distribution network power supply recovery scheme with optimal voltage loss and a corresponding main transformer overload optimal switching scheme of the main transformer stations, eliminates the problem of main transformer overload of the main transformer stations, and ensures safe and stable operation of a power grid.
The technical purpose of the invention is realized by the following technical scheme:
a high-voltage distribution network transfer optimization method considering wiring unit and transmission blockage comprises the following steps:
acquiring the number of all line switches of the high-voltage distribution network after the main transformer station fails, and constructing a power supply recovery sub-model of the high-voltage distribution network after the main transformer station fails according to the number of the line switches;
establishing a high-voltage distribution network power supply conversion optimization sub-model overloaded by a main transformer station according to the on-off state of a high-voltage distribution network line and the reverse charging of a high-voltage distribution network bus;
establishing a high-voltage distribution network transfer optimization model under a transmission resistance plug of a main transformer station together according to a power supply recovery submodel and a transfer optimization submodel of the high-voltage distribution network;
and performing transfer optimization on the high-voltage distribution network based on the transfer optimization model.
According to the method, a high-voltage distribution network power supply recovery sub-model after a main transformer station fault and a high-voltage distribution network power supply conversion optimization sub-model of main transformer station overload are established, a high-voltage distribution network power supply conversion optimization model under a main transformer station transmission resistance plug is established according to the two sub-models, the problem of power supply recovery after the main transformer station is subjected to voltage loss and the problem of main transformer overload of other main transformer stations are solved through the established models, a high-voltage distribution network power supply recovery scheme with optimal voltage loss and a corresponding optimal power supply conversion scheme of main transformer station main transformer overload are provided, the problem of main transformer overload of the main transformer stations is eliminated, and safe and stable operation of a power grid is guaranteed.
Furthermore, when the power grid fails in the t-th time period, the power supply of the power failure area is recovered on the premise of safe power grid operation, and according to the voltage loss line of the 110kV high-voltage power distribution network after the 220kV main transformer station failsThe switch number is an objective function for constructing and recovering power supply for the target, and the calculation formula is as follows:
wherein the content of the first and second substances,
110kV line switch for loss of load of 220kV station for loss of voltage in t-th period, NpThe total number of 110kV line switches which represent the loss load of a 220kV station with voltage loss,
represents the active load corresponding to the voltage loss of the jth 110kV station in the tth time period, wjRepresents the weight, S, of the load supplied by each of the 110kV voltage-loss linescjA 110kV line switch representing a lost load of a 220kV station at lost voltage.
Further, according to the reliability principle of power supply of the 110kV high-voltage distribution network, a constraint condition for recovering power supply is established by taking the total load amount of recovered power supply smaller than the upper limit of the transmission safety capacity of the 110kV line on the 'transfer belt' side as constraint, and the calculation formula is as follows:
wherein the content of the first and second substances,
110kV station line switch for representing t-th time period and no voltage loss
Corresponding load factor matrix
The coefficient (c) of (a) to (b),
represents the upper limit of the transmission safety capacity of the 110kV line on the 'transfer belt' side,
a 110kV line switch of lost load of a 220kV station indicating a loss of voltage for a tth period,
represents the active load corresponding to the voltage loss of the jth 110kV station in the tth time period, NpAnd the total number of 110kV line switches which represent the loss load of the 220kV station with loss voltage.
Further, according to the network characteristics of the 110kV high-voltage power distribution network, a target function is established with the minimum total operation times of the line switch in the switching process, and the calculation formula is as follows:
wherein the content of the first and second substances,
the state of line switch j after optimization for time t, 0 indicates that the switch is in the open state, 1 indicates that the switch is in the running state,
optimizing the state of the front line switch for the t-th time period, NsAnd the total number of the optimized variables of the line switch is represented.
Further, considering that an overload of adjacent 220kV main transformer stations can be caused when the 220kV main transformer stations supply power to a plurality of 110kV high-voltage power distribution networks and have faults, the highest utilization efficiency of the main transformers of the 220kV main transformer stations is used as a punishment condition to optimize a target function to obtain a new target function, and the calculation formula is as follows:
wherein k represents the kth 220kV substation after the 'tape change', MkRepresenting all 110kV switch sets, P, connected to the kth 220kV substation after' tape changejRepresents the j 110kV station load after the tape is turned,
represents the total main transformer capacity, N, of the kth 220kV transformer substationT，220kV220 representing full network participation in handover optimizationAnd the total number of the kV stations.
Furthermore, constraint conditions of the 110kV high-voltage power distribution network and the 220kV main transformer station are established according to the running state of the line switch of the 110kV high-voltage power distribution network.
Further, the topology modeling is carried out on the wiring unit to obtain the network topology active power balance constraint of the high-voltage distribution network, and the calculation formula is as follows:
wherein NT, 220kV represents the total number of 220kV stations which participate in the supply optimization of the whole network,
the active capacity of the main substation grid of the ith 220kV main substation is shown,
load coefficient matrix representing the corresponding of the tth time interval and the 110kV station line switch without voltage loss
Corresponding coefficient (c).
Furthermore, capacity constraint is established by taking the constraint that the active capacity of a main transformer lower network of the main transformer station can not exceed the main transformer capacity of the main transformer station as constraint, and the calculation formula is as follows:
wherein λ represents the proportionality coefficient of short-time overload, Pmax，GiThe maximum active power allowed to be transmitted for the main transformer of the ith 220kV transformer substation.
Further, radiation type constraint of a 110kV power grid structure needs to be considered in the power supply optimization of the 110kV high-voltage power distribution network, and the switching state S of the 110kV line in the t-th periodtShould satisfy
Wherein N isT，110kVRepresents the total number of 110kV stations participating in the switching supply optimization of the whole network,
optimizing the state of line switch j for time t, NsAnd the total number of the optimized variables of the line switch is represented.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention considers the power balance equation of the typical wiring of the 110kV power distribution network, simplifies the nonlinear transfer optimization problem into the full quadratic programming problem, and has the precondition of carrying out optimization calculation on line in real time.
2. When the 220kV power grid fails, the invention can solve the problem of power supply recovery after the voltage loss of 1 220kV station and the problem of overload of other 220kV station main transformer by the aid of the established power supply conversion model, provides a 110kV power grid power supply recovery scheme with optimal voltage loss and a corresponding optimal power supply conversion scheme with 220kV station main transformer overload, eliminates overload of a main transformer of a 220kV transformer substation, and ensures safe and stable operation of the power grid.
3. The invention provides a high-voltage distribution network transfer optimization method considering typical wiring units and transmission blockage, which solves the problem of real-time optimal transfer of a 110kV high-voltage distribution network under the conditions of 220kV main transformer overload and 220kV power grid faults.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of 110kV bus power supply of a 110kV line reverse charging 220kV station;
FIG. 3 is a wiring diagram of a practical 110kV high-voltage distribution network;
FIG. 4 is a diagram of a power supply recovery scheme for total station voltage loss of a new two villages station of a 220kV transformer substation;
FIG. 5 is a main transformer overload diagram of a plurality of 220kV main transformer stations;
fig. 6 is a diagram of a 110kV grid supply optimization scheme of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example one
In this embodiment, a method for optimizing the transfer of power to a high voltage distribution network in consideration of a wiring unit and transmission blocking is provided, as shown in fig. 1, including the following steps:
s1, acquiring the number of line switches of the high-voltage distribution network after the main substation fails, and constructing a power supply recovery sub-model of the high-voltage distribution network after the main substation fails according to the number of the line switches;
s2, establishing a main transformer station overloaded high-voltage distribution network transfer optimization sub-model according to the high-voltage distribution network line switching state and the reverse charging of a high-voltage distribution network bus;
s3, establishing a high-voltage distribution network transfer optimization model under a transmission resistance plug of a main transformer station according to the power supply recovery submodel and the transfer optimization submodel of the high-voltage distribution network;
and S4, performing transfer optimization on the high-voltage distribution network based on the transfer optimization model.
The working principle is as follows: according to the method, a high-voltage distribution network power supply recovery sub-model after a main transformer station fault and a high-voltage distribution network power supply conversion optimization sub-model of main transformer station overload are established, a high-voltage distribution network power supply conversion optimization model under a main transformer station transmission resistance plug is established according to the two sub-models, the problem of power supply recovery after the main transformer station is subjected to voltage loss and the problem of main transformer overload of other main transformer stations are solved through the established models, a high-voltage distribution network power supply recovery scheme with optimal voltage loss and a corresponding optimal power supply conversion scheme of main transformer station main transformer overload are provided, the problem of main transformer overload of the main transformer stations is eliminated, and safe and stable operation of a power grid is guaranteed.
As shown in fig. 2, a schematic diagram of a 110kV station 110kV bus with 110kV line reverse charging and voltage loss is given, when 2 main transformers of the 220kV station simultaneously fail or a transmission line of the 220kV station fails, voltage loss of 110kV double buses of the 220kV station may be caused, further resulting in voltage loss of a plurality of 110kV stations. How to adopt 110kV bus of 220kV station with 110kV line reverse charging and voltage loss and gradually recover partial 110kV station power supply is the key problem to be solved for 110kV switching supply under 220kV power grid fault, when 220kV power grid fault causes 220kV station voltage loss and load recovery from 110kV line reverse charging, power supply recovery to power failure area as much as possible should be considered, so the optimization object is all 110kV line switches of 220kV station with voltage loss, namely line switches s of 110kV C and D, E, F in figure 2cAnd a 110kVB station line switch S which has topological relation with the 220kVA1 station and is not subjected to voltage lossdTherefore, a 110kV high-voltage distribution network power supply recovery sub-model considering the 220kV power grid fault is established.
When a 220kV power grid fails, partial 110kV spare power automatic switching actions are caused, and the main transformer of an adjacent 220kV station is possibly overloaded; meanwhile, according to the reverse charging of the 110kV bus of the voltage-loss 220kV station, the overload of a new 220kV main transformer can occur. The switching state of a 110kV line is taken as an optimization object, a sub-model for optimizing the switching supply of the 110kV high-voltage distribution network considering the overload of a 220kV main transformer is established, and the following embodiment will further explain the two sub-models.
When a power grid fault occurs in the t-th time period, on the premise that the power grid runs safely, power supply is recovered to a power failure area, a target function for recovering power supply is constructed for a target according to the switch number of a voltage loss line of a 110kV high-voltage power distribution network after the 220kV main transformer station fault, and the calculation formula is as follows:
wherein the content of the first and second substances,
110kV line switch for loss of load of 220kV station for loss of voltage in t-th period, NpThe total number of 110kV line switches which represent the loss load of a 220kV station with voltage loss,
represents the active load corresponding to the voltage loss of the jth 110kV station in the tth time period, wjRepresents the weight, S, of the load supplied by each of the 110kV voltage-loss linescjA 110kV line switch representing a lost load of a 220kV station at lost voltage.
According to the reliability principle of power supply of a 110kV high-voltage distribution network, a constraint condition for recovering power supply is established by taking the total load amount of recovered power supply smaller than the upper limit of the transmission safety capacity of a 110kV line on a 'transition zone' side as constraint, and the calculation formula is as follows:
wherein the content of the first and second substances,
110kV station line switch for representing t-th time period and no voltage loss
Corresponding load factor matrix
The coefficient (c) of (a) to (b),
represents the upper limit of the transmission safety capacity of the 110kV line on the 'transfer belt' side,
a 110kV line switch of lost load of a 220kV station indicating a loss of voltage for a tth period,
represents the active load corresponding to the voltage loss of the jth 110kV station in the tth time period, NpAnd the total number of 110kV line switches which represent the loss load of the 220kV station with loss voltage. Specifically, when the direct supply and T-shaped wiring modes are used for reversely charging a 110kV bus of a voltage-loss 220kVA1 station, the power supply reliability of the direct supply and T-shaped wiring modes is higher than that of the other wiring modes. According to the reliability principle, the line switch is determined by selecting the power supply with the highest reverse charging capacity in the two connection modes.
Establishing a target function with minimum total operation times of a line switch in a switching process according to network characteristics of a 110kV high-voltage power distribution network, wherein the calculation formula is as follows:
wherein the content of the first and second substances,
the state of line switch j after optimization for time t, 0 indicates that the switch is in the open state, 1 indicates that the switch is in the running state,
optimizing the state of the front line switch for the t-th time period, NsAnd the total number of the optimized variables of the line switch is represented. In particular, in order to eliminate the overload of a 220kV main transformerAnd the problem is solved, and the switching supply of the 110kV station supplied by the power supply device is achieved through the orderly operation of the 110kV line switch. When the 110kV mode in the t-th period is adjusted, the minimum total action times of the 110kV line switch are considered, and the remote operation times for changing and recovering the power grid operation mode are reduced as far as possible, namely the special operation mode after the receiving-end power grid is supplied is close to the preset power grid standard operation mode as far as possible.
The 220kV main transformer station can cause the overload of adjacent 220kV main transformer stations when supplying power to a plurality of 110kV high-voltage power distribution networks and having faults, so that the highest utilization efficiency of the main transformer of the 220kV main transformer station is used as a punishment condition to optimize a target function to obtain a new target function, and the calculation formula is as follows:
wherein k represents the kth 220kV substation after the 'tape change', MkRepresenting all 110kV switch sets, P, connected to the kth 220kV substation after' tape changejRepresents the j 110kV station load after the tape is turned,
represents the total main transformer capacity, N, of the kth 220kV transformer substationT，220kVAnd the total number of 220kV stations participating in the switching supply optimization of the whole network is represented. In particular, in practice, 1 220kV station powers a plurality of 110kV stations, and there may be a plurality of transfer schemes. In order to ensure the uniqueness of the transfer scheme, the highest utilization efficiency of a main transformer of a 220 kV' transfer station is introduced as a punishment condition to optimize the objective function of the high-voltage distribution network transfer optimization submodel.
And establishing constraint conditions of the 110kV high-voltage power distribution network and the 220kV main transformer station according to the running state of the line switch of the 110kV high-voltage power distribution network.
Carrying out topology modeling on the wiring unit to obtain the network topology active power balance constraint of the high-voltage distribution network, wherein the calculation formula is as follows:
i＝1，..NT，220kVwherein N isT，220kV220 representing full network participation in handover optimizationThe total number of the kV stations is,
the active capacity of the main substation grid of the ith 220kV main substation is shown,
load coefficient matrix representing the corresponding of the tth time interval and the 110kV station line switch without voltage loss
Corresponding coefficient (c).
The active capacity of the lower network of the main transformer station can not exceed the main transformer capacity of the main transformer station as the constraint to establish the capacity constraint, and the calculation formula is as follows:
wherein λ represents the proportionality coefficient of short-time overload, Pmax，GiThe maximum active power allowed to be transmitted for the main transformer of the ith 220kV transformer substation.
Calculating the radiation type constraint of a 110kV power grid structure in the supply optimization of a 110kV high-voltage power distribution network, and then calculating the switching state S of a 110kV line in the t-th periodtShould satisfy
Wherein N isT，110kVRepresents the total number of 110kV stations participating in the switching supply optimization of the whole network,
optimizing the state of line switch j for time t, NsAnd the total number of the optimized variables of the line switch is represented.
Example two
The second embodiment is based on the first embodiment and is described in detail, and a load transfer test analysis is performed on a certain actual 110kV urban high-voltage distribution network. In fig. 3, the golden cow, the new village, the pool Kangjie, the Anshun bridge, the Wuhou and the Shiyang are all 5 220kV stations of 2 × 180MVA, and the rest are all 110kV stations.
In fig. 3, a category 6 110kV typical wiring mode is covered, such as a direct supply wiring mode of a 110kV oasis station; a linear different-station serial connection mode consisting of a 110kV white silk street station and a Chongzuwan station; a straight-line-shaped same-station serial power supply wiring mode formed by the 110kV west river station and the yellow sky dam station; a T-shaped different station series power supply wiring mode formed by a 110kV positive mansion street station and a west-one ring station; a T-shaped co-station series connection mode consisting of the 110kV Jiuliti station and the star station No. 1 and No. 2 main transformers, wherein the 110kV star station No. 3 main transformer is powered by a T-connection circuit; the 110kV Yulin station, the Tongzi forest station and the high and new stations form a hybrid series-supply wiring mode of different stations. In the figure, the subway station is a terminal station and is a single power supply line. After removing the in-line co-site tandem, T-connection, and terminal connections (as shown by the dashed boxes in fig. 3), the total switch optimization variables for the entire network are 23. In addition, black squares in the figure indicate that the 110kV line switch is in an operating state, white squares indicate that the 110kV line switch is in a hot standby state, and the 110kV oasis, star, front manway, lucky street, Xiyi circle, slurry washing street, Yulin, Tung Zilin, temple street and Chaudu bay station all cast 110kV standby power supply automatic casting devices.
After the load reduction of a linear same-station serial supply connection mode, a T connection mode and a terminal station connection mode, 10kV loads carried by each 220kV station are removed, the residual total capacity Pmax and G of a main transformer are shown in a table 1, and the table 1 is the residual total capacity of the main transformer of each 220kV station.
TABLE 1 Total residual Capacity of the Main transformers of the 220kV stations
Suppose that the 220kV bus of the new 220kV village station fails, which causes the 220kV bus differential protection action and causes the total station to lose voltage. At the moment, the spare power automatic switching devices of the 110kV star street, the positive house street and the lucky street station supplied by the new two villages can all act by virtue of power supply of the 220kV golden cow station, the Wuhou station and the pond ridge street station. However, when the 110kV subway station, the Jiulii lifting station and the white wire street station lose voltage, the power supply of the voltage losing station needs to be recovered as soon as possible. The weights of the loads of a 110kV subway station, a Jiuliti station and a white silk street station are given below and are shown in Table 2.
TABLE 2110 kV subway station, Jiuliti station, and white wire street station
And, the residual capacity of part of 110kV lines is shown in Table 3,
TABLE 3 part 110kV line residual capacity
The analysis of the switching optimization result comprises the analysis of the power supply recovery scheme result of the 110kV voltage loss station and the analysis of the switching result of the main transformer overloads of a plurality of 220kV stations, and the analysis results are as follows:
and (3) analyzing the result of a power supply recovery scheme of the 110kV voltage loss station, after the total voltage loss of the 220kV new two-village station, the total voltage loss of the Jiulii station and the spare power automatic switching devices of the star stations 1 and 2 successfully act, the power supply of the golden cow station is changed, the spare power automatic switching devices of the prefecture street station, the auspicious street station and the white wire street station successfully act, the power supply of the Wuhou station, the pool ridge street station and the Anshun bridge station is respectively changed, and the total voltage loss of the subway station is realized.
According to the calculation of the 110kV high-voltage distribution network power supply recovery submodel considering the 220kV power grid fault, the following power supply recovery scheme is obtained, and the scheme is shown in figure 4. Wherein the red arrows indicate the flow direction of the power restoration. According to the load size of the back-off 110kV station (as shown in figure 5). The column shows the remaining capacity table of each 110kV line in table 3 after the total station voltage loss in the new village of 220 kV.
Meter 4220kV residual capacity of 110kV line of total station of new two villages station after voltage loss
As can be seen from Table 4, only the line from the Kangjie station to the luckiness station can carry 23MW load of a 110kV subway station. According to the graph 4, the 110kV bus power supply of the new two villages and small towns is recovered through the 110kV line from the pool, the street to the lucky street station, and then the 110kV subway station load with the highest weight in the voltage loss load is recovered. Moreover, as can be seen from table 3, the residual capacity of the 110kV line from the kangkangjie street to the luckiness street station is 42MW, which is greater than 23MW of the total station load of the 110kV subway station, but is less than 109MW of the total load sum 23+86 of the subway station and the jiuliti station, so that the total station load of the 110kV subway station can be recovered.
And (3) analyzing the transfer result of the overload of the main transformer of a plurality of 220kV stations:
after the total station of the 220kV new two villages station loses voltage, all the 110kV star station, the Zheng Fu street station, the Jixiang street station and the Baisi street station are inverted to the adjacent golden cow station, Wuhou station, the Tang Kangjie station and the Anshun bridge station to supply power. According to the table 1, the surplus available capacity of the golden cow station and the stone sheep station is large, and the overload problem of the main transformer of the spare power automatic switching device cannot be caused after the spare power automatic switching device acts; however, the remaining available capacity of the wuhou and ann bridge station is low, and after the backup automatic switching device acts, the overload problem of the main transformer inevitably occurs, which is shown in fig. 5 and table 5. In the figure, circles indicate the operation pattern of the switches.
TABLE 5 overload situation of main transformers of each 220kV station
According to the table 5, the main transformer overload occurs in the pool ridge street and the martial weather station, and the other 220kV stations have no main transformer overload problem. Therefore, the optimization of 110kV load transfer for the Kangjie and the Wuhou station of the pond is needed.
From the results of fig. 6, it is understood that the total number of operations of the 110kV switch is 6. When the 110kV oasis station is powered by the Wuhou station to the golden ox station, namely the load of the Wuhou station is reduced by 80MW, the problem of 76MW overload of the Wuhou station in figure 5 can be eliminated immediately. When the 110kV Yulin station and the temple street station are powered by the Shiyang station and the Anguil bridge station, the load of 52MW +60MW is reduced to 112MW totally, and the problem of 89MW overload caused by the main change of the Weilin station in figure 5 is solved.
In summary, the model for optimizing the transfer of the 110kV high-voltage distribution network under the 220kV power transmission blockage is designed, so that the problem of power restoration of the loss-voltage load under the condition of the 220kV power grid failure and the problem of how to transfer the load when the 220kV main transformer is overloaded correspondingly are solved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A high-voltage distribution network transfer optimization method considering wiring unit and transmission blockage is characterized by comprising the following steps:
acquiring the number of all line switches of the high-voltage distribution network after the main transformer station fails, and constructing a power supply recovery sub-model of the high-voltage distribution network after the main transformer station fails according to the number of the line switches;
establishing a high-voltage distribution network power supply conversion optimization sub-model overloaded by a main transformer station according to the on-off state of a high-voltage distribution network line and the reverse charging of a high-voltage distribution network bus;
establishing a high-voltage distribution network transfer optimization model under a transmission resistance plug of a main transformer station together according to a power supply recovery submodel and a transfer optimization submodel of the high-voltage distribution network;
and performing transfer optimization on the high-voltage distribution network based on the transfer optimization model.
2. The method according to claim 1, wherein the grid fault occurs in the t-th time period, the power supply is restored to the blackout area on the premise of safe grid operation, an objective function for restoring the power supply is constructed according to the number of switches of the voltage loss line of the 110kV high-voltage distribution network after the 220kV main substation fault, and the calculation formula is as follows:
wherein the content of the first and second substances,
110kV line switch for loss of load of 220kV station for loss of voltage in t-th period, NpTotal number of 110kV line switches representing lost load of 220kV station with voltage loss, Pj tRepresents the active load corresponding to the voltage loss of the jth 110kV station in the tth time period, wjRepresents the weight, S, of the load supplied by each of the 110kV voltage-loss linescjA 110kV line switch representing a lost load of a 220kV station at lost voltage.
3. The method according to claim 1, wherein a constraint condition for power restoration is established under the constraint that the total load of power restoration is less than the upper limit of the transmission safety capacity of the 110kV line on the "transition zone" side according to the reliability principle of power supply of the 110kV high-voltage distribution network, and the calculation formula is as follows:
wherein the content of the first and second substances,
110kV station line switch for representing t-th time period and no voltage loss
Corresponding load factor matrix
The coefficient (c) of (a) to (b),
represents the upper limit of the transmission safety capacity of the 110kV line on the 'transfer belt' side,
110kV line switch for loss of load of 220kV station for loss of voltage in t-th periodj tRepresents the active load corresponding to the voltage loss of the jth 110kV station in the tth time period, NpAnd the total number of 110kV line switches which represent the loss load of the 220kV station with loss voltage.
4. The method according to claim 1, wherein the objective function is established according to the network characteristics of the 110kV high voltage distribution network with the minimum total operation times of the line switches in the transfer process, and the calculation formula is as follows:
wherein the content of the first and second substances,
the state of line switch j after optimization for time t, 0 indicates that the switch is in the open state, 1 indicates that the switch is in the running state,
optimizing the state of the front line switch for the t-th time period, NsAnd the total number of the optimized variables of the line switch is represented.
5. The method according to claim 4, wherein the 220kV main substation causes overload of adjacent 220kV main substations when power supply to the 110kV high-voltage power distribution networks fails, so that the highest utilization efficiency of the main substations of the 220kV main substations is used as a penalty condition to optimize an objective function to obtain a new objective function, and the calculation formula is as follows:
wherein k represents the kth 220kV substation after the 'tape change', MkRepresenting all 110kV switch sets, P, connected to the kth 220kV substation after' tape changejMeans "turn toWith "the next jth 110kV station load,
represents the total main transformer capacity, N, of the kth 220kV transformer substationT，220kVAnd the total number of 220kV stations participating in the switching supply optimization of the whole network is represented.
6. The method according to claim 1, wherein the constraints of the 110kV high-voltage distribution network and the 220kV main substation are established according to the operating states of the line switches of the 110kV high-voltage distribution network.
7. The method according to claim 6, wherein the topology modeling of the connection unit is performed to obtain the network topology active power balance constraint of the high voltage distribution network, and the calculation formula is as follows:
wherein N isT，220kVRepresents the total number of 220kV stations participating in the switching supply optimization of the whole network,
the active capacity of the main substation grid of the ith 220kV main substation is shown,
load coefficient matrix representing the corresponding of the tth time interval and the 110kV station line switch without voltage loss
Corresponding coefficient (c).
8. The method of claim 6, wherein the active capacity of the main substation cannot exceed the active capacity of the grid of the high voltage distribution network due to the connection unit and transmission congestionThe main transformer capacity of the main transformer station is used as constraint to establish capacity constraint, and the calculation formula is as follows:
wherein λ represents the proportionality coefficient of short-time overload, Pmax，GiThe maximum active power allowed to be transmitted for the main transformer of the ith 220kV transformer substation.
9. The method according to claim 6, wherein the radiation constraints of the 110kV power grid structure are calculated during the optimization of the 110kV high-voltage distribution network, and the switching state S of the 110kV line is determined during the t-th periodtShould satisfy
Wherein N isT，110kVRepresents the total number of 110kV stations participating in the switching supply optimization of the whole network,
optimizing the state of line switch j for time t, NsAnd the total number of the optimized variables of the line switch is represented.
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