CN110176767B - Construction method of bottom-preserving net rack in coastal region - Google Patents
Construction method of bottom-preserving net rack in coastal region Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The application discloses a coastal region bottom-preserving net rack construction method, which comprises the following steps: obtaining key user information of a target city in a coastal region; acquiring power supply channel information of each key user in the key user information; inquiring the high-reliability channel part of each power supply channel according to the power supply channel information, and determining the initial node of each high-reliability channel part; according to the power supply requirements of key users corresponding to the high-reliability channel part, an energy storage power station is arranged at a starting node of the high-reliability channel part, and the energy storage configuration of the energy storage power station is matched with the power supply requirements; the technical problem of how to build a 'lifeline' channel for highly reliable power supply of the bottom-protecting net frame in the coastal region and construct a self-balancing local power grid under typhoon disasters is solved.
Description
Technical Field
The application relates to the technical field of bottom-protecting power grids, in particular to a method for constructing a bottom-protecting grid frame in a coastal region.
Background
Cities located in coastal areas are often threatened by typhoons, and each landing of a strong typhoon will cause severe damage to their power grid. The damage of strong typhoon to the power grid is difficult to avoid, but the power supply safety of urban key users can be provided through the arrangement of a bottom-guaranteed power grid, so that the quick power restoration capability after serious faults is improved. Therefore, the technical staff in the field need to solve the problem how to create a 'lifeline' channel for highly reliable power supply of an undersea grid in a coastal region and construct a self-balanced local power grid in typhoon disasters.
Disclosure of Invention
The application provides a method for constructing a bottom-protecting net rack in a coastal region, which solves the technical problems of how to build a 'lifeline' channel for high-reliability power supply of the bottom-protecting net rack in the coastal region and construct a self-balancing local power grid under a typhoon disaster.
In view of this, the present application provides a method for constructing a bottom-preserving net rack in a coastal region, including:
acquiring key user information of a target city located in a coastal region;
acquiring power supply channel information of each key user in the key user information;
inquiring high-reliability channel parts of each power supply channel according to the power supply channel information, and determining initial nodes of the high-reliability channel parts; the high-reliability channel part is directly in power supply communication with the key users, all voltage nodes in the high-reliability channel part are indoor transformer substations, and all voltage nodes are supplied with power by full cables; the starting node is a voltage node with the highest voltage grade in the high-reliability channel part;
and according to the power supply requirements of key users corresponding to the high-reliability channel part, setting an energy storage power station at a starting node of the high-reliability channel part, wherein the energy storage configuration of the energy storage power station is matched with the power supply requirements.
Preferably, the querying the high-reliability channel part of each power supply channel according to the power supply channel information, and determining the start node of each high-reliability channel part specifically includes:
traversing each voltage node in the power supply channel;
if the substation of the voltage node is an indoor substation, recording a first identifier of the voltage node as 1, otherwise, recording the first identifier as 0;
if a power supply line between the voltage node and a next-stage voltage node with a lower voltage level than the voltage node is a full cable line, recording a second identifier of the voltage node as 1, otherwise, recording the second identifier as 0;
calculating a third identification of the voltage node; the third identifier is a product of the first identifier and the second identifier;
arranging the third identifications from low to high according to the voltage levels of the voltage nodes;
sequentially identifying the third identification sequences obtained by arrangement;
when a voltage node with a first third identifier of 0 is identified, judging whether the voltage node is the first in the third identifier sequence, and if the voltage node is the first, determining that the power supply channel does not have a high-reliability channel part; if not, determining that the previous voltage node of the voltage node is the initial node of the high-reliability channel part of the power supply channel;
and if the voltage node with the third identifier of 0 does not appear after the identification is finished, determining that the last voltage node in the third identifier sequence is the initial node of the high-reliability channel part of the power supply channel.
Preferably, the power supply requirement specifically includes a maximum security load and a maximum security electric quantity;
the maximum security load is calculated by a first formula;
the first formula is specifically:
wherein, P c Is the maximum safety load of the c-th high-reliability channel section, L m The security load of the mth key user is obtained, and n is the total amount of the key users corresponding to the part of the mth high-reliability channel;
the maximum security electric quantity is calculated by a second formula;
the second formula is specifically:
wherein E is c Is the maximum safe electric quantity of the c high reliability channel part, t m The maximum possible power failure time of the mth key user in the typhoon disaster.
Preferably, the energy storage configuration specifically includes a rated power and a rated capacity of the energy storage;
the rated power is calculated by a third formula, and the rated capacity is calculated by a fourth formula;
the third formula is specifically:
the fourth formula is specifically:
wherein, P s For said rated power, E s To said rated capacity, G s For the power supply contained in said high-reliability channel part, k s In order to utilize the coefficient, eta is the energy storage discharge efficiency, SOC m Maximum allowable state of charge, SOC, for energy storage 0 To a minimum allowable state of charge, T s The maximum time requirement for recovering power supply for key users affected by typhoon disaster is met.
Preferably, 0 < eta < 1,0 < SOC 0 ＜SOC m ≤1。
Preferably, the setting of the energy storage power station at the start node of the high-reliability channel portion specifically includes:
and arranging an energy storage power station at a low-voltage side bus of the indoor substation of the starting node.
According to the technical scheme, the method has the following advantages:
the application provides a coastal region bottom-protecting net rack construction method, which comprises the following steps: obtaining key user information of a target city in a coastal region; acquiring power supply channel information of each key user in the key user information; inquiring the high-reliability channel part of each power supply channel according to the power supply channel information; the high-reliability channel part is specifically a power supply channel in which all voltage nodes are indoor transformer substations and all cables supply power among all the voltage nodes; determining the voltage node with the highest voltage grade in each searched high-reliability channel part as an initial node; and according to the power supply requirements of key users corresponding to the high-reliability channel part, setting an energy storage power station with energy storage configuration corresponding to the power supply requirements at a starting node of the high-reliability channel part.
According to the method, the advantages of flexible configuration and high response speed of the energy storage power station are utilized, the isolated network operation capacity of urban key users is improved through the ' lifeline ' channel of ' energy storage ' -indoor station ' -cable line ' -key user ' under the typhoon disaster, a local power grid capable of self-balancing operation is formed, the basic operation of the city is guaranteed, the social influence is reduced, the comprehensive disaster-resistant guarantee system construction of source, network, load and storage coordination disaster resistance is promoted, and the influence of the typhoon disaster on the power grid in coastal regions is reduced.
Drawings
Fig. 1 is a flowchart of a method for constructing a coastal region bottom-preserving net rack according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of an exemplary urban warranty grid according to the present disclosure;
fig. 3 is a flowchart of a method for constructing a coastal region bottom-preserving net rack according to a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a high-reliability channel portion of the guaranteed-base power grid shown in fig. 2, in which only a power supply channel is reserved;
fig. 5 is a schematic structural diagram of each initial node in fig. 4 after an energy storage power station is arranged.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions of the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The main mode of construction of the bottom-guaranteed power grid is to achieve better disaster-resistant benefits by strengthening and differentially designing important lines and stations. According to the definition of the bottom-protected power grid, the range of the power grid usually only covers city centers and urban districts, and the county-level administrative districts of the strong wind districts are properly considered. The construction of the power grid in the region is limited by the construction form and the construction difficulty, and the power transmission channel of a full cable and an indoor station is difficult to manufacture. Therefore, while the coastal region bottom-guaranteed power grid improves the wind protection rating of important lines and sites, the uncertainty of typhoon disasters still puts requirements on the "lifeline" channel of the high-reliability power supply of key users.
With the rapid development of energy storage technology, the application of energy storage on the power supply side, the power grid side and the user side becomes a hot spot of current research. The energy storage technology has the advantages of flexible capacity configuration and high response speed, so that the energy storage power station is configured at important sites of the bottom-protection power grid by combining with research results of the bottom-protection power grid in coastal areas, the advantages of the energy storage power station are fully exerted, the conventional frequency modulation and frequency modulation functions can be exerted when the bottom-protection power station is in normal operation without disasters, the isolated network operation capacity of key users in cities can be improved under typhoon disasters, and the disaster resistance of the bottom-protection power grid is greatly improved.
Referring to fig. 1, fig. 1 is a flowchart of a method for constructing a coastal area bottom-preserving net rack according to a first embodiment of the present application, where the method includes:
The key users, that is, users with high power supply reliability requirements, may refer to table 1, where table 1 shows exemplary key user information of a certain urban power grid.
TABLE 1
With further reference to fig. 2, fig. 2 is a schematic structural diagram of a city bottom-protecting power grid matched with the above table 1. In the above table 1, the city has 15 users, wherein 4 users are located in the central city area S1; the 11 items of secondary users are mainly distributed in city and county administrative centers S1-S3 of the central city and the strong wind district. The simplified structure of the power grid comprises 1 500kV transformer substation (A1), 7 220kV public stations (B1-B7), 16 110kV public stations (C1-C16) and 1 disaster prevention guarantee power supply (G1).
It should be noted that the information contained in table 1 above can be obtained from the power department, and the data such as the maximum possible blackout time can be obtained from the meteorological department and the power grid marketing department. Of course, the above table 1 is only an example, and in actual application, the required information is not limited to the information listed in the above table, and may be other information meeting the requirements.
And 102, acquiring power supply channel information of each key user in the key user information.
For a critical user, it usually has one main power supply channel. For example, the key users of U1 in table 1 above have their main power supply channels A1-B2-C3, and C3 is directly connected to U1 to directly supply power to U1. This information can be directly obtained by the power department.
And 103, inquiring the high-reliability channel part of each power supply channel according to the power supply channel information, and determining the initial node of each high-reliability channel part.
The high reliability channel is defined as the term. The high-reliability channel part, which needs to be directly connected with the power supply of the key user, such as the above-mentioned U1 key user, should include the voltage node C3, so as to satisfy the condition of being directly connected with the power supply of the U1 key user.
And the high-reliability channel part also needs to meet a second condition, namely all voltage nodes are indoor transformer substations and all the voltage nodes are supplied with power by full cables.
For example, for a U1 key user, referring to fig. 2, it can be known that, among voltage nodes A1 to C3, substations at two voltage nodes B2 and C3 are all indoor substations, and the two substations are supplied with power by full cables and directly communicate with the U1, so that they are high-reliability channel portions; between A1 and B2, A1 is an outdoor transformer substation, which is easily influenced by typhoon, and between A1 and B2, a full-cable power supply mode is not adopted, so that the transformer substation does not belong to a high-reliability channel part.
It should be noted that the start node is the voltage node with the highest voltage level in the high reliability channel portion. As mentioned previously, B2-C3 are part of their high reliability channels for U1 critical users. In its high reliability channel portion, B2 is the 220kV node, which is the highest voltage level of the two voltage nodes, and thus is determined as the starting node.
And 104, setting an energy storage power station at a starting node of the high-reliability channel part according to the power supply requirements of key users corresponding to the high-reliability channel part.
Wherein the energy storage configuration of the energy storage power station is matched with the power supply requirement.
After the initial node is determined, the energy storage power station is arranged at the initial node, so that the reliability of the bottom-guaranteed power grid can be greatly improved.
The method provided by the first embodiment of the application utilizes the advantages of flexible configuration and high response speed of the energy storage power station, improves isolated network operation capacity of urban key users through ' energy storage ' -indoor station ' -cable line ' -life line ' channels of ' key users ' under typhoon disasters, forms a local power grid capable of self-balancing operation, ensures basic operation of the city, reduces social influence, promotes the construction of a comprehensive disaster-resistant guarantee system for coordinating disaster resistance of sources, networks, loads and storages, and reduces the influence of typhoon the power grid in coastal regions.
Referring to fig. 3, fig. 3 is a flowchart of a method for constructing a coastal area bottom-preserving net rack according to a second embodiment of the present application, where the method includes:
The above two steps can refer to the description of the first embodiment.
When determining which parts of the power supply channel are high-reliability channel parts, the present embodiment provides a method, and a specific embodiment sets a first identifier, a second identifier, and a third identifier. Wherein the third identifier is a product of the first identifier and the second identifier.
The third identifier, that is, the identification degree of the power supply channel of the jth level voltage node of the ith key user, may be recorded as:
Y i (j)＝P i (j)×S i (j)
wherein: p is i (j) A second identifier, that is, an identifier indicating whether a power supply line between a jth voltage node and a next-stage voltage node having a lower voltage level than the jth voltage node in a power supply channel of the ith key user is a full cable or not, wherein the second identifier is marked as 1 if the power supply line between the jth voltage node and the next-stage voltage node having the lower voltage level than the jth voltage node is a full cable line, and the second identifier is marked as 0 if the power supply line between the jth voltage node and the next-stage voltage node having the lower voltage level than the jth voltage node is a full cable line; s. the i (j) And marking as a first identification, namely a substation indoor internalization index of the jth level voltage node of the ith key user, if the substation is an indoor substation, marking as 1, and otherwise, marking as 0.
It can be seen that the third identifier is 1 only when the first identifier and the second identifier are both 1, and at this time, it can be determined which parts are high-reliability channel parts.
And step 204, if a power supply line between the voltage node and a next-level voltage node with a lower voltage level than the voltage node is a full cable line, recording a second identifier of the voltage node as 1, otherwise, recording the second identifier as 0.
When the voltage node with the first third identifier of 0 is identified during specific determination, judging whether the voltage node is the first in the third identifier sequence, and if the voltage node is the first, determining that the power supply channel does not have a high-reliability channel part; if the voltage node is not the first one, determining that the previous voltage node of the voltage node is the starting node of the high-reliability channel part of the power supply channel; and if the voltage node with the third identifier of 0 does not appear after the identification, namely the whole power supply channel meets the condition of high reliability, determining that the last voltage node (namely the voltage node with the highest voltage grade) in the third identifier sequence is the initial node of the high-reliability channel part of the power supply channel.
Taking a first-level user U1 as an example, the main power supply channels thereof are A1-B2-C3, and the cabling index (second identifier) and the indoor station index (first identifier) on the U1 power supply channel are respectively:
P 1 (A1～B2 B2～C3 C3～U1)＝|0 1 1|
S 1 (A1 B2 C3)＝|0 1 1|
its corresponding third identity is:
Y 1 ＝|0 1 1|
after the third marks are arranged from low to high according to the voltage levels, namely arranged according to C3, B2 and A1,
Y 1 ′＝|1 1 0|
it can be seen that Y 1 The first third voltage node labeled 0 in' is A1, and its previous voltage node B2 is the start node of the high reliability channel portion of user U1.
The determination method of the high reliability channel portion of the other key users and the determination method of the start node are the same as described above. Finally, the high reliability path portion of the example grid shown in fig. 2 is shown in fig. 4, and the warranty grid has 4 high reliability path portions, which are:
L1：B1～C6～(U7+U9)；
L2：B2～C3～(U1+U2)；
L3：B2～C4～C5～(U3+U8+U10+U11+U12)；
L4：C11～(U13+U14)。
and step 207, setting an energy storage power station at a low-voltage side bus of the indoor substation of the starting node according to the power supply requirement of the key user corresponding to the high-reliability channel part.
It should be noted that the power supply requirements of the key users specifically include a maximum security load and a maximum security electric quantity.
The maximum security load can be calculated by the first formula.
The first formula is specifically:
wherein, P c Maximum safety load of the c-th high reliability tunnel section, L m The security load of the mth key user is n, and the n is the total amount of the key users corresponding to the c-th high-reliability channel part.
The maximum security electric quantity can be calculated by the second formula.
The second formula is specifically:
wherein E is c Maximum safe power, t, of the c-th high reliability channel section m The maximum possible power failure time of the mth key user in the typhoon disaster.
Taking the L1 high-reliability channel part as an example, the key users corresponding to the high-reliability channel part are U7 "public security bureau" and U9 "power supply bureau":
the maximum security load calculated according to the first formula is:
P c (L1)＝500+800＝1300kW。
and calculating according to a second formula to obtain the maximum security electric quantity as follows:
in this embodiment, the power supply requirements of the key users corresponding to all the high-reliability channel portions are shown in table 2.
TABLE 2
It is readily understood that the energy storage configuration of the energy storage plant should be matched to the power supply requirements. Specifically, the energy storage configuration includes a rated power and a rated capacity of the energy storage.
Wherein the rated power can be calculated by a third formula, and the rated capacity can be calculated by a fourth formula.
The third formula is specifically:
the fourth formula is specifically:
wherein, P s At rated power, E s To rated capacity, G s For high reliability of the power supply contained in the channel section, k s In order to utilize the coefficient, eta is the energy storage discharge efficiency, SOC m For storing energy at maximum allowable state of charge, SOC 0 To minimize the allowable state of charge, note that 0 < eta < 1,0 < SOC 0 ＜SOC m ≤1，T s The maximum time requirement for recovering power supply for key users affected by typhoon disaster is met.
Taking the high-reliability channel part of the power supply channel shown in fig. 4 as an example, η =0.9 and SOC may be taken m ＝1、SOC 0 =0.2, and the due energy storage configuration of the energy storage power station set by the start nodes C11, B1, and B2 can be calculated by using the third formula and the fourth formula as shown in table 3.
TABLE 3
Referring to fig. 5, fig. 5 is a schematic diagram of a high-reliability channel part of a power supply channel after an energy storage power station is arranged, and it can be seen that the energy storage power station of each initial node is combined with the high-reliability channel part of the power supply channel to construct a bottom-protected power grid "lifeline" channel based on "energy storage" - "indoor station" - "cable line" - "key user". Even in the face of disasters such as severe typhoons, the upper-level power supply is lost completely, and the bottom-protecting power grid still has strong anti-disaster capability under a self-balancing operation system formed by a source, a grid, a load and a storage, so that the basic operation of a city can be guaranteed, and the social influence can be reduced.
In the second embodiment of the present application, the advantages of flexible configuration and high response speed of the energy storage power station are utilized, and the isolated network operation capability of the urban key users is improved through the "lifeline" channel of the "energy storage" - "indoor station" - "cable line" - "key user" in the typhoon disaster, so that a local power grid capable of self-balancing operation is formed, the basic operation of the city is guaranteed, the social influence is reduced, and a comprehensive disaster-resistant guarantee system for coordinating and resisting disaster by a propulsion source, a network, a load and a storage is built, and the influence of the typhoon disaster on the power grid in the coastal region is reduced.
The terms "first," "second," "third," "fourth," and the like (if any) in the description of the present application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (5)
1. A coastal region bottom-preserving net rack construction method is characterized by comprising the following steps:
obtaining key user information of a target city in a coastal region;
acquiring power supply channel information of each key user in the key user information;
inquiring the high-reliability channel part of each power supply channel according to the power supply channel information, and determining the starting node of each high-reliability channel part specifically comprises the following steps:
traversing each voltage node in the power supply channel;
if the substation of the voltage node is an indoor substation, recording a first identifier of the voltage node as 1, otherwise, recording the first identifier as 0;
if a power supply line between the voltage node and a next-stage voltage node with a lower voltage level than the voltage node is a full cable line, recording a second identifier of the voltage node as 1, otherwise, recording the second identifier as 0;
calculating a third identification of the voltage node; the third identifier is a product of the first identifier and the second identifier;
arranging the third identifications from low to high according to the voltage levels of the respective voltage nodes;
sequentially identifying the third identification sequences obtained by arrangement;
when a voltage node with a first third identifier of 0 is identified, judging whether the voltage node is the first in the third identifier sequence, and if the voltage node is the first, determining that the power supply channel does not have a high-reliability channel part; if not, determining that the previous voltage node of the voltage node is the initial node of the high-reliability channel part of the power supply channel;
if the voltage node with the third identifier of 0 does not appear after the identification is finished, determining that the last voltage node in the third identifier sequence is the initial node of the high-reliability channel part of the power supply channel;
the high-reliability channel part is directly in power supply communication with the key users, all voltage nodes in the high-reliability channel part are indoor transformer substations, and all voltage nodes are supplied with power by full cables; the starting node is a voltage node with the highest voltage grade in the high-reliability channel part;
and according to the power supply requirements of key users corresponding to the high-reliability channel part, setting an energy storage power station at a starting node of the high-reliability channel part, wherein the energy storage configuration of the energy storage power station is matched with the power supply requirements.
2. The coastal zone bottom-protecting grid construction method according to claim 1, wherein the power supply requirement specifically includes a maximum security load and a maximum security electric quantity;
the maximum security load is calculated by a first formula;
the first formula is specifically:
wherein, P c Maximum safety load of the c-th high reliability tunnel section, L m The security load of the mth key user is obtained, and n is the total amount of the key users corresponding to the mth high-reliability channel part;
the maximum security electric quantity is calculated by a second formula;
the second formula is specifically:
wherein E is c Is the maximum safe electric quantity of the c high reliability channel part, t m The maximum possible power failure time of the mth key user in the typhoon disaster.
3. The coastal region bottom-preserving net rack construction method according to claim 2, wherein the energy storage configuration specifically comprises a rated power and a rated capacity of energy storage;
the rated power is calculated by a third formula, and the rated capacity is calculated by a fourth formula;
the third formula is specifically:
the fourth formula is specifically:
wherein, P s For said rated power, E s To said rated capacity, G s For the power supply contained in said high-reliability channel part, k s In order to utilize the coefficient, eta is the energy storage discharge efficiency, SOC m For storing energy at maximum allowable state of charge, SOC 0 To a minimum allowable state of charge, T s The maximum time requirement for recovering power supply for key users affected by typhoon disaster is met.
4. The coastal region bottom-preserving net rack construction method according to claim 3,
0＜η＜1，0＜SOC 0 ＜SOC m ≤1。
5. the coastal region bottom-preserving grid construction method according to claim 1, wherein the step of arranging an energy storage power station at a starting node of the high-reliability channel section specifically comprises:
and arranging an energy storage power station at a low-voltage side bus of the indoor substation of the starting node.
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