CN102290799A - Small-scale quick recovery method for power supply of power distribution network in open loop running - Google Patents

Abstract

The invention relates to a small-scale fast power supply recovery method for an open-loop operation distribution network. The steps of the method are: start the power supply recovery process; through real-time monitoring of the distribution network operation and information interaction with other information systems, process all The operation information of the distribution network is obtained, and the non-fault power loss area that needs to be restored is determined; the power supply restoration plan is formulated according to the power supply restoration rules; the power supply restoration plan is implemented, and the power supply of the non-fault power loss area is restored; according to certain rules /Expert knowledge, judge whether it is necessary to optimize and adjust the operation mode; if the operation mode does not need to be adjusted, the power supply recovery process ends; if the operation mode needs to be adjusted, proceed to the next step; perform optimization analysis and calculation, and formulate an operation mode optimization and adjustment plan ; Execute the operation mode optimization and adjustment scheme, and return to the step of judging whether to optimize and adjust the operation mode.

Description

A small-scale fast power supply recovery method for open-loop distribution network

technical field

The invention belongs to the technical field of power system operation control, and specifically relates to a small-scale fast power supply recovery method of an open-loop operation distribution network.

Background technique

The distribution network directly faces the end customers of the electric power enterprise, directly serves the majority of users, and undertakes the function of supplying electricity to customers. In a broad sense, distribution network power supply restoration refers to the use of modern advanced electronic technology, computer network and communication technology to realize the restoration of power supply to non-faulty areas of the distribution network. Under the conditions of different hardware equipment, the processing methods of distribution network power supply restoration mainly include distributed intelligence method and centralized intelligence method.

The main equipment in the distributed intelligent mode is a sectionalizer with reclosing function composed of FTU combined with circuit breaker or load switch. It means that the on-site FTU has the ability of automatic fault judgment, isolation and power supply recovery, without the participation of communication and master station systems. There are mainly two kinds of voltage time type (determine the fault area according to the time from reclosing of substation outlet protection to voltage loss again) and current counting type (determine the fault area according to the number of times the recloser breaks the fault current). The significant advantage of this type of method is that it is low in cost and does not require the participation of communication and master stations. However, it has the following disadvantages: ①The speed of fault handling and power supply recovery is slow, which has a large impact on the system and users; ②After the fault recovery network is reconfigured, the setting parameters of the recloser need to be changed, and the complex network with multiple power sources and branches is difficult to coordinate its parameters; ③The reclosing locking of the sectionalizer downstream of the fault point depends on the abnormal voltage when the fault is detected as the locking condition. When the fault conditions are different, the characteristics of the abnormal voltage also change greatly, so the locking conditions are more complicated. This method is suitable for the "hand in hand" line with relatively simple grid structure, mainly dual power supply, such as the distribution network in rural areas or urban suburbs, and occasions where there is no means of communication or the communication conditions are not perfect, and the reliability requirements are not high. .

The main equipment of centralized intelligent mode is load switch with remote control function, fault indicator, FTU with communication function, communication channel and master station system. It uploads the fault information detected by the on-site FTU to the master station through the communication equipment, and the master station determines the fault area according to a certain algorithm through the received fault indication information and real-time topology information of the distribution network, and issues operation instructions to the master station. The associated FTU trips to isolate the fault. Then, the main station determines the recovery plan through power supply restoration decision calculation, restores power supply to non-fault outage areas, and completes load transfer, which is also called DMS processing method. This method is characterized by a high level of automation, is suitable for distribution networks with complex structures, and can take into account actual load levels and network constraints. At the same time, the method uses intelligent software to locate and isolate at one time, avoiding multiple trial throws of the switch and reducing equipment loss. The disadvantage of this method is that the investment is large, and the reliability and communication rate of the communication system are very high.

Contents of the invention

The purpose of the present invention is to provide a small-scale fast power supply recovery method for an open-loop distribution network when there is a small-scale non-fault power outage area in the open-loop distribution network.

The object of the present invention is to adopt following technical scheme to realize:

A small-scale fast power supply recovery method for an open-loop distribution network, the improvement of which is that the method includes the following steps:

(1) Start the power supply recovery process;

(2) Through the real-time monitoring of distribution network operation and information interaction with other information systems, process the obtained distribution network operation information, and determine the non-fault outage areas that need to restore power supply;

(3) Formulate a power supply restoration plan according to the power supply restoration rules;

(4) Execute the power supply recovery plan, and restore the power supply in the non-fault de-energized area;

(5) According to certain rules/expert knowledge, judge whether it is necessary to optimize and adjust the operation mode; if the operation mode does not need to be adjusted, the power supply recovery process ends; if the operation mode needs to be adjusted, proceed to step (6);

(6) Conduct optimization analysis and calculation, formulate operation mode optimization and adjustment plan;

(7) Execute the operation mode optimization and adjustment plan, and return to step (5).

A preferred technical solution provided by the present invention is: the restoration of power supply refers to the process of restoring the state of the power distribution network after a fault and the operation state of the power grid after the operation of the power grid to avoid accidents to the normal state. For power supply recovery; the power supply recovery rule refers to the rules used to achieve power supply recovery, which is based on a certain distribution network connection mode and is typical; the non-fault power loss area refers to the fault isolation Measures, the network or equipment in the area under its jurisdiction does not fail, and the area that can supply power normally but loses power.

The second preferred technical solution provided by the present invention is: in the step (1), when the following conditions are met, the power supply recovery process is started:

A. After the risk prevention and control is over, judge whether there is a load that needs to restore power supply, and if necessary, start the power supply restoration control plan;

B. After the emergency control is over, determine whether there is a load that needs to restore power supply, and if necessary, start the power supply restoration control scheme;

C. After manually changing the original operation mode, judge whether there is a load that needs to restore power supply, and if necessary, start the power supply restoration control scheme;

D. Start the power supply recovery control scheme according to the operator starting the power supply recovery command or when the system detects that there is an area that needs power supply recovery.

The third preferred technical solution provided by the present invention is: the distribution network operation information in the step (2) refers to the switch opening and closing state information of the distribution network, and the voltage of each node of the distribution network before and after power supply recovery and current information; said other information systems include data acquisition and monitoring control systems.

The fourth preferred technical solution provided by the present invention is: said step (3) power supply recovery rules include conventional power supply fast power supply recovery rules realized based on the division of power distribution network connection types and including distributed The fast power supply restoration rules of the power supply DG; the fast power supply restoration rules of the conventional power supply based on the division of the distribution network wiring type and the fast power supply restoration rules of the distributed power supply DG include the power supply restoration rules of the radial wiring mode of a single power supply, and the double-circuit power supply restoration rules. Power supply recovery rules for parallel wiring, power supply recovery rules for single power supply self-loop network wiring, power supply recovery rules for dual power supply hand-in-hand wiring, power supply recovery rules for switching station wiring, and power supply for N-supply and 1-backup wiring Restoration rules, power supply restoration rules for N power supply hand-in-hand wiring, and power supply restoration rules for grid-like complex wiring; the certain rules/expert knowledge include judging whether the voltage and current exceed the limit.

The fifth preferred technical solution provided by the present invention is: in the step (5), the following content is used to judge whether it is necessary to optimize and adjust the mode of operation:

When the load carried by the transfer power source exceeds the load capacity of the transfer power source, or the voltage deviation exceeds the safe value after the power supply is restored in the non-fault power outage area, or the scheme adjustment operation is required according to the operator's instruction, the executed Optimal analysis of the power supply scheme.

The sixth preferred technical solution provided by the present invention is: the risk prevention control refers to the preventive control measures taken when the distribution network is in a risk state; the emergency control refers to the measures taken when the distribution network is in an emergency state. control measures.

The seventh preferred technical solution provided by the present invention is: the power supply restoration rules containing the distributed power supply DG include:

a. If the distributed power supply DG operates independently, but there is an automatic conversion device between the distributed power supply DG and the local power grid, first rely on the automatic conversion device, adopt the island operation mode, and enable the distributed power supply DG to respond to the non-fault failure Electric district power supply;

b. If the distributed power supply DG runs in parallel with the distribution network system, but the distributed power supply DG has no output to the local power grid, according to the real-time output of the distributed power supply DG, when the distributed power supply DG brings up the non- When the load of the fault power outage area is enabled, the distributed power supply DG is used to supply power to the non-fault power outage area using the island operation mode; enter the step (4) of the power supply recovery method; when the real-time output of the distributed power supply cannot bring the local load, maintain the de-energized state of the non-fault de-energized area; or

c. If the distributed power supply DG runs in parallel with the system and outputs electric energy to the local power grid, activate the distributed power supply DG to restore power supply to the non-fault outage area to the greatest extent.

The eighth preferred technical solution provided by the present invention is: the local power grid is a distribution network powered by a conventional power supply connected to the local power grid with respect to the local power grid powered by distributed power sources;

The automatic conversion device refers to the control equipment installed between the distributed power supply and the local power grid, through which the local power grid can be selected to be powered by the conventional power supply, or powered by the distributed power supply DG;

The island operation mode refers to a mode in which it is separated from the large power grid and powered independently by the distributed power supply DG;

The parallel operation refers to connecting the distributed power supply DG as a power supply in parallel to the local power grid, and supplying power to local loads together with the conventional power supply.

Compared with prior art, the beneficial effect that the present invention reaches is:

The invention comprehensively considers the deficiencies of the prior art and the influence of the distributed power supply, and provides a small-scale rapid power supply recovery method of an open-loop operation distribution network. Compared with the prior art, the present invention identifies non-fault outage areas that need to be restored on the basis of various operating information of the power distribution network, and formulates and executes corresponding power supply restoration methods according to the wiring type of the feeder where the non-fault outage areas are located. . The power supply recovery scheme is more targeted, and the operation is simpler, which greatly saves the time for power supply recovery. After the power supply recovery method is executed, the safe operation information of the distribution network is monitored, and the operation mode that needs to be adjusted is further optimized and adjusted, so as to ensure the safe and reliable operation of the distribution network.

Description of drawings

Figure 1 is a single power supply radiation wiring diagram;

Figure 2 is a double circuit parallel wiring diagram;

Figure 3 is a single power supply self-loop network wiring diagram;

Figure 4 is a hand-in-hand wiring diagram of dual power supplies;

Fig. 5 is the wiring diagram of switchgear;

Figure 6 is a wiring diagram of N supply and 1 standby mode;

Figure 7 is a multi-power hand-in-hand wiring diagram;

Figure 8 is a grid-like complex wiring diagram;

Fig. 9 is an overall flowchart of the power supply recovery method provided by the present invention;

Fig. 10 is a flowchart of power supply recovery including distributed power supply DG provided by the present invention.

Detailed ways

The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The invention provides a small-scale rapid power supply recovery method for an open-loop distribution network, which divides the distribution network into single-power radial connection, double-loop parallel connection, single-power self-loop network connection, and dual-power supply according to different connection modes. There are eight wiring types: hand-in-hand wiring, switching station wiring, N supply and 1 standby wiring, N power supply hand-in-hand wiring, and grid-like complex wiring. Each wiring type corresponds to different power supply recovery rules. N is a positive integer of ≤5.

The present invention provides a power supply recovery rule for fast power supply restoration using a conventional power supply, and a power supply recovery rule including a distributed power supply DG when there is still a non-fault blackout area after the conventional power supply is restored.

The power supply restoration mentioned above refers to the process of returning the state of the power grid after a fault and the operation state of the power grid after some grid operations to avoid certain accidents to the normal state, which is called power supply restoration.

The power supply recovery rule refers to a rule used to realize power supply recovery, which is based on a certain formulation method (a certain distribution network connection method) and is typical. This method adopts power supply recovery rules based on the division of distribution network wiring types, including power supply recovery rules for single power source radial connection mode, power supply recovery rules for double circuit parallel connection mode, power supply recovery rules for single power source self-loop network connection mode, Power supply recovery rules for dual power supply hand-in-hand wiring, power supply recovery rules for switching station wiring, power supply recovery rules for N supply and 1 standby wiring, power supply recovery rules for N power supply hand-in-hand wiring, and grid-like complex wiring methods power restoration rules.

The non-fault power-off area refers to the area where the network or equipment in the area under its jurisdiction does not fail due to the fault isolation measures, and the power supply can be normally provided but the power is lost.

As shown in Figure 9, Figure 9 is an overall flowchart of the power supply recovery method provided by the present invention, and the present invention includes the following steps:

(1) Start the power supply recovery process.

The power restoration process is initiated when the following conditions are met:

A. After the risk prevention and control is over, judge whether there is a load that needs to restore power supply, and if necessary, start the power supply restoration control plan;

B. After the emergency control is over, judge whether there is a load that needs to restore power supply, and if necessary, start the power supply restoration control plan;

C. After manually changing the original operation mode, judge whether there is a load that needs to restore power supply, and if necessary, start the power supply restoration control plan;

D. When the operator initiates the power supply restoration command or the system detects that there is an area that needs to restore power supply.

The risk prevention and control refers to the prevention and control measures taken when the power grid is in a risky state. Risk state means that under the current operating conditions of the power grid or operating conditions after the current time point, one or more operating indicators of the power grid have exceeded or will exceed the predetermined range, which is likely to lead to the deterioration of the target parameters of the power grid operation, or the occurrence of certain events. or a variety of power grid accidents; or the power grid operation status in which there is no risk in the power grid, but predetermined events and operating conditions occur, and preventive control measures need to be taken. Such as overload, low voltage, local overheating, operating point close to the stability limit, and other abnormal operating conditions.

The emergency control refers to the control measures taken when the power grid is in an emergency state. Emergency state means that one or more power grid accidents have occurred or are continuing to occur in one or more power grids, and protection and control measures have not been taken; or although protection and control measures have been taken, the accident continues and the power grid operation is still deteriorating. It has caused or is causing interruption of power supply to users, damage to power facilities, serious exceedance of power quality (frequency limit, overvoltage, voltage sag/low voltage, high wave distortion rate, etc.), grid instability, etc.; or Although there is no fault in the power grid, there are scheduled events and operating conditions, and emergency protection and control measures need to be taken.

(2) Through real-time monitoring of distribution network operation and information interaction with other information systems (such as data acquisition and monitoring and control systems), process the obtained distribution network operation information to determine non-fault power failures that need to restore power supply area.

(3) Formulate a power supply restoration plan according to the power supply restoration rules.

The rules for power restoration with conventional power are as follows:

1) Power supply recovery rules for radial wiring of single power supply

a If the non-fault de-energized area is adjacent to the power supply, close the section switch to restore the power supply of the non-fault de-energized area.

b. If the non-fault de-energized area is not adjacent to the power supply, the power supply will not be restored.

The single power source radial connection refers to a feeder line associated with only one power source, and the feeder line extends from the power source point to the load center without load transfer capability, as shown in FIG. 1 .

2) Power supply recovery rules for double-circuit parallel wiring

The power supply recovery under the double-circuit parallel connection mode and the power supply recovery under the single power supply radial connection mode adopt the same rule for power supply recovery.

The double-circuit parallel connection refers to a connection mode in which two feeder lines run parallel to each other and extend from the power source point to the load center at the same time. According to the customer's situation, the power supply of two power sources can be obtained at the same time, or only one power source can be obtained, as shown in Figure 2.

3) Power supply recovery rules for single power supply self-loop network connection mode

a. If the non-fault de-energized area is adjacent to the power supply, close the section switch to restore the power supply to the non-fault de-energized area.

b. If the non-fault de-energized area is adjacent to the normal power supply feeder, close the contact switch between the two to restore the power supply to the non-fault de-energized area.

The single power supply self-loop network connection refers to the loop formed by two feedback lines drawn from the same bus bar, and the load in the loop is powered by the two loops at the same time. If one of the loops fails, the other loop can bear the load in the loop. The power supply for all loads is shown in Figure 3.

4) Power supply recovery rules for dual power supply hand-in-hand wiring

a. If the non-fault de-energized area is adjacent to the power supply, close the section switch to restore the power supply to the non-fault de-energized area.

b. If the non-fault de-energized area is adjacent to the normal power supply feeder, then compare the transfer capacity P _S2Z of the adjacent feeder with the required recovery load P _lose of the de-energized area.

When P _S2Z ≥ P _lose , close the contact switch between the non-fault de-energized area and other adjacent feeders, and restore the power supply of the non-fault de-energized area;

合上非故障失电区域与其他馈线的联络开关，恢复非故障失电区域的供电。When P _S2Z <P _lose , cut off the load P _lose1 farthest from the tie switch, judge the size of P _S2Z and (P _lose -P _lose1 ), until the transfer capacity of the adjacent feeder

Close the contact switch between the non-fault de-energized area and other feeders to restore the power supply to the non-fault de-energized area.

The dual power supply hand-in-hand wiring refers to two feeder lines drawn from different substations or different busbars of the same substation connected by a tie switch to form a loop, and the tie switch is in a disconnected state under normal conditions. If one circuit breaks down, the other circuit can supply power to all loads in the circuit by closing the tie switch, as shown in Figure 4.

5) Power supply recovery rules for the wiring mode of the switch station

a. If the non-fault power-off area is located at the incoming line of the switching station, close the section switch between the switching station and another power supply to restore the power supply to the switching station.

b. If the non-fault de-energized area is located at the outgoing line of the switching station, the outgoing line and the radial wiring of the single power supply shall adopt the same rule for power supply restoration.

The wiring of the switching station refers to that two or more feeders drawn from different substations or different busbars of the same substation are connected to the switching station. Lead out multiple outgoing lines to supply power to the surrounding loads, as shown in Figure 5.

6) Power supply recovery rules for N-supply and 1-standby wiring

a. If the non-fault de-energized area is adjacent to the power supply, close the section switch between the non-fault de-energized area and the power supply to restore the power supply to the non-fault de-energized area.

b. If the non-fault de-energized area is adjacent to the backup line, close the section switch of the non-fault de-energized area and the backup line to restore the power supply to the non-fault de-energized area.

The N-supply and 1-backup wiring means that N lines are connected to form a ring network, and one line is used as a public backup line. The non-standby lines are running at full load. If one of the running lines fails, the standby line can be put into operation through line switching, as shown in Figure 6.

7) Power supply recovery rules for N power supply hand-in-hand wiring

a. If the non-fault de-energized area is adjacent to the power supply, close the contact switch between the non-fault de-energized area and the power supply to restore the power supply to the non-fault de-energized area.

b. If the non-fault de-energized area is adjacent to feeders with N conditions other than the power supply, judge the voltage and transfer capacity of the contact switches between the N feeders and the non-fault de-energized area, and record the value when N=1 The associated feeder is S ₂ , when N is greater than 1, the feeder with the highest voltage value/largest transfer capacity is S ₂ , and the feeder with the second highest voltage/highest transfer capacity is S ₃ , which is the same as S ₂ in the power supply The feeder with the second highest voltage/transfer capacity is S ₄ .

Compare the transfer capacity P _{S2Z of} the feeder S ₂ with the required recovery load P _lose in the non-fault outage area.

When P _S2Z ≥ P _lose , close the feeder S ₂ of the power supply and the contact switch of the non-fault de-energized area, and restore the power supply of the non-fault de-energized area;

When P _S2Z < P _lose , if there is S ₄ , then close the contact switch between S ₂ , S ₄ and the non-fault power-off area. At the same time, if the non-fault power-off area can be divided into independent power supply areas and two independent power supply areas areas are connected with S ₂ and S ₄ respectively, then the non-fault de-energized area is divided into two independent power supply areas powered by S ₂ and S ₄ sub-divided, preferentially adopt S ₂ transfer load scheme)

When P _S2Z <P _lose , if S ₄ does not exist but S ₃ exists, if the non-fault de-energized area can be divided into independent power supply areas and the two independent power supply areas are connected to S ₂ and S ₃ respectively, then the non-fault The faulty power-off area is divided into two independent power supply areas powered by S ₂ and S ₄ respectively (when there are multiple schemes for dividing into independent power supply areas, choose to divide the load into equal parts and give priority to the scheme of transferring power from S ₂ to a larger load), Close the contact switch between S ₂ , S ₃ and the non-fault de-energized area; if the non-fault de-energized area cannot be divided into two independent power supply areas connected with S ₂ and S ₃ respectively, cut off the one farthest from the contact switch Load P _lose1 , judge the size of P _S2Z and P _lose -P _lose1 , until the transfer capacity of the adjacent feeder Close the contact switch between the non-fault de-energized area and other feeders to restore the power supply to the non-fault de-energized area.

The multi-power supply hand-in-hand wiring refers to multiple feeders from different substations or different buses of the same substation. One or more tie switches are set between each feeder. If any feeder fails, close the tie switch and transfer the load to Supply to the adjacent feeder to complete the transfer, as shown in Figure 7.

8) Power supply recovery rules for grid-like complex wiring

a. If the non-fault de-energized area is adjacent to the original power supply, close the contact switch between the non-fault de-energized area and the power supply to restore the power supply to the non-fault de-energized area.

b. If the non-fault de-energized area is adjacent to N-condition feeders other than the original power supply, judge the voltage at the contact switch between the N feeders and the non-fault-de-energized area. When N=1, record the connected feeder as S _2. When N is greater than 1, record the feeder with the highest voltage value/largest transfer capacity as S ₂ , the feeder with the second highest voltage/transfer capacity as S ₃ , and the second highest voltage/transfer in the same power supply as S ₂ The feeder with the second highest supply capacity is S ₄ .

Compare the transfer capacity P _{S2Z of} S ₂ with the required recovery load P _lose in the non-fault power loss area.

When P _S2Z ≥ P _lose , close the feeder S ₂ of the power supply and the contact switch of the non-fault de-energized area, and restore the power supply of the non-fault de-energized area;

When P _S2Z < P _lose , if there is S ₄ , then close the contact switch between S ₂ , S ₄ and the non-fault power-off area. At the same time, if the non-fault power-off area can be divided into independent power supply areas and two independent power supply areas areas are connected with S ₂ and S ₄ respectively, then the non-fault de-energized area is divided into two independent power supply areas powered by S ₂ and S ₄ sub-divided, preferentially adopt S ₂ transfer load scheme)

合上非故障失电区域与其他馈线的联络开关，恢复非故障失电区域的供电。When P _S2Z <P _lose , if S ₄ does not exist but S ₃ exists, if the non-fault de-energized area can be divided into independent power supply areas and the two independent power supply areas are connected to S ₂ and S ₃ respectively, then the non-fault The faulty power-off area is divided into two independent power supply areas powered by S ₂ and S ₄ respectively (when there are multiple schemes for dividing into independent power supply areas, choose to divide the load into equal parts and give priority to the scheme of transferring power from S ₂ to a larger load), Close the contact switch between S ₂ , S ₃ and the non-fault de-energized area; if the non-fault de-energized area cannot be divided into two independent power supply areas connected to S ₂ and S ₃ respectively, cut off the load farthest from the contact switch P _lose1 , judge the size of P _S2Z and (P _lose -P _lose1 ), until the transfer capacity of the adjacent feeder

Close the contact switch between the non-fault de-energized area and other feeders to restore the power supply to the non-fault de-energized area.

The grid-shaped complex wiring refers to a plurality of feeders from different substations or different busbars of the same substation, and a plurality of tie switches are arranged between each feeder to interconnect with other feeders, and each feeder is connected through a tie switch. Each grid is formed so that users can obtain power from multiple feeders, as shown in Figure 8.

The power supply recovery rules with distributed power supply DG are as follows:

1) Power supply recovery rules for radial wiring of single power supply

A. If the non-fault de-energized area is adjacent to the power supply, close the section switch to restore the power supply to the non-fault de-energized area.

B. If the non-fault power-off area is not adjacent to the power supply, it is judged whether the non-fault power-off area contains a distributed power supply DG, and if there is a DG, the power supply recovery rule containing DG is adopted, otherwise the power supply cannot be restored.

2) Power supply recovery rules for double-circuit parallel wiring

The power supply recovery under the double-circuit parallel connection mode and the power supply recovery under the single power supply radial connection mode with distributed power supply DG adopt the same rule for power supply recovery.

3) Power supply recovery rules for single power supply self-loop network connection mode

A. If the non-fault de-energized area is adjacent to the power supply, close the section switch to restore the power supply to the non-fault de-energized area.

B. If the non-fault de-energized area is adjacent to the feeder, close the contact switch between the two to restore the power supply to the non-fault de-energized area.

4) Power supply recovery rules for dual power supply hand-in-hand wiring

A. If the non-fault de-energized area is adjacent to the power supply, close the section switch to restore the power supply to the non-fault de-energized area.

B. If the non-fault de-energized area is adjacent to the feeder, compare the transfer capacity P _S2Z of the adjacent feeder with the recovery load P _lose required by the non-fault de-energized area.

When P _S2Z ≥ P _lose , close the contact switch between the non-fault de-energized area and other adjacent feeders, and restore the power supply of the non-fault de-energized area;

When P _S2Z <P _lose , cut off the load P _lose1 farthest from the tie switch, judge the size of P _S2Z and (P _lose -P _lose1 ), until the transfer capacity of the adjacent feeder Close the contact switch between the non-fault de-energized area and other feeders to restore the power supply to the non-fault de-energized area.

C. For non-fault outage areas that cannot be transferred to power supply, judge whether the area contains DG, and if it does, adopt the power supply recovery rule that includes DG, otherwise the power supply recovery in this area cannot be realized.

5) Power supply recovery rules for the wiring mode of the switch station

A. If the non-fault power-off area is located at the incoming line of the switching station, close the section switch between the switching station and another power supply to restore the power supply to the switching station.

B. If the non-fault power outage area is located at the outgoing line of the switching station, the outgoing line and the radial wiring of the single power supply shall adopt the same rule for power supply restoration.

6) Power supply recovery rules for N-supply and 1-standby wiring

A. If the non-fault de-energized area is adjacent to the power supply, close the section switch between the non-fault de-energized area and the power supply to restore the power supply to the non-fault de-energized area.

B. If the non-fault de-energized area is adjacent to the backup line, close the section switch of the non-fault de-energized area and the backup line to restore the power supply of the non-fault de-energized area.

7) Power supply recovery rules for N power supply hand-in-hand wiring

A. If the non-fault de-energized area is adjacent to the power supply, close the contact switch between the non-fault de-energized area and the power supply to restore the power supply to the non-fault de-energized area.

B. If the non-fault de-energized area is adjacent to other feeders, compare the voltage at the contact switch between the adjacent feeder and the de-energized area, take the feeder of the power supply with the highest voltage value as S ₂ , close the non-fault de-energized area and The contact switch between the feeder S _{and 2} of the power supply restores the power supply in the non-fault de-energized area.

8) Power supply recovery rules for grid-like complex wiring

A. If the non-fault de-energized area is adjacent to the power supply, close the contact switch between the non-fault de-energized area and the power supply to restore the power supply to the non-fault de-energized area.

B. If the non-fault de-energized area is adjacent to the feeder, judge the voltage at the contact switch between the remaining N-1 feeders and the de-energized area, take the feeder of the power supply with the highest voltage value as S ₂ , and compare its transfer capacity P _S2Z and the size of the recovery load P _lose required for non-fault power-off areas.

When P _S2Z ≥ P _lose , close the feeder S ₂ of the power supply and the contact switch of the non-fault de-energized area, and restore the power supply of the non-fault de-energized area;

合上非故障失电区域与其他馈线的联络开关，恢复非故障失电区域的供电。对于不能转供的非故障停电区域，判断该区域是否含有DG，含有则采用含DG的供电恢复规则，否则无法实现该区域的供电恢复。When P _S2Z <P _lose , the transferable power supply on the same side as the power supply feeder S ₂ in the section switch in the non-fault power-off area is eliminated. If there is no other power supply that can be transferred, cut off the load P _lose1 farthest from the tie switch, judge the size of P _S2Z and (P _lose -P _lose1 ), until the transfer capacity of the adjacent feeder

Close the contact switch between the non-fault de-energized area and other feeders to restore the power supply to the non-fault de-energized area. For non-fault outage areas that cannot be transferred to power supply, it is judged whether the area contains DG, and the power supply recovery rule containing DG is adopted, otherwise the power supply recovery of this area cannot be realized.

C. If there is a transferable power source connected to the other section switch side of the non-fault power-off area, then open the section switch closest to other transferable power supply in the non-fault power-off area, close the non-fault power-off area and other A contact switch that can transfer the power supply. At the same time, close the feeder _S2 of the power supply and the contact switch of the non-fault de-energized area to restore the power supply of the non-fault de-energized area.

As shown in Figure 10, the power supply recovery rules of the distributed power supply DG are as follows:

1) If the distributed power source operates independently, but there is an automatic conversion device between the distributed power source and the local power grid. Then first rely on the conversion device, adopt the island operation mode, and enable the distributed power supply to supply power to the de-energized area;

2) If the distributed power supply runs in parallel with the system, but the distributed power supply has no output to the local power grid. Then check the real-time output of the distributed power supply according to the operation data of the power distribution network. When the DG can take up the load in the power-off area, enable the distributed power supply and use the island operation mode to supply power to the power-off area, and enter the next step of the power supply restoration process. Steps: When the real-time output of distributed power cannot bring up the local load, keep the power-off state of the non-fault power-off area;

3) If the distributed power supply runs in parallel with the system and outputs electric energy to the local grid. Then enable the distributed power supply to restore the power supply to the power loss area to the greatest extent.

(4) Implement the power supply recovery plan to restore the power supply in non-fault power-off areas.

(5) According to certain rules/expert knowledge (such as whether the voltage and current exceed the limit), etc., determine whether to optimize and adjust the operation mode. If the operation mode does not need to be adjusted, the power supply restoration process ends. If the operation mode needs to be adjusted, proceed to step (6).

The rules for judging whether to optimize and adjust the operation mode are as follows: When the load carried by the transfer power source exceeds its load capacity, or the voltage deviation exceeds the safe value after the power supply is restored in a non-fault power outage area, it is necessary to optimize and analyze the implemented power supply scheme ; Otherwise, no need to adjust the operating mode.

(6) Carry out optimization analysis and calculation, formulate operation mode optimization and adjustment plan.

(7) Execute the operation mode adjustment scheme, and return to step (5).

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application rather than to limit its protection scope. Although the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: After reading this application, those skilled in the art can still make various changes, modifications or equivalent replacements to the specific implementation methods of the application. These changes, modifications or equivalent replacements are all within the scope of the pending claims of the application.

Claims (9)

1. the on a small scale quick service restoration method of open loop operation power distribution network is characterized in that described method comprises the steps:

(1) starts the service restoration flow process;

(2) by real-time monitoring to power distribution network operation, and with the information interaction of other information systems, handle the power distribution network operation information that is obtained, determine the non-fault dead electricity zone that need restore electricity;

(3) according to service restoration Rulemaking service restoration scheme;

(4) carry out described service restoration scheme, recover the power supply in described non-fault dead electricity zone;

(5), judge whether to need to optimize and adjust operational mode according to certain rule/expertise; If do not need to adjust operational mode, then the service restoration flow process finishes; Adjust operational mode if desired and then carry out step (6);

(6) be optimized analysis and calculating, formulate optimizing operating mode and adjustment scheme;

(7) carry out described optimizing operating mode and adjustment scheme, return step (5).

2. quick service restoration method as claimed in claim 1, it is characterized in that, described service restoration is meant with state of living in behind the distribution network failure with for the operation of power networks recovering state after avoiding accident to take electric grid operating to change to be called service restoration to the process of normal condition; Described service restoration rule is meant the rule that is used for realizing service restoration, and this rule is based on certain power distribution network mode of connection, and has typicalness; Described non-fault dead electricity zone is meant that owing to take the Fault Isolation measure, the network or the equipment of region within the jurisdiction do not break down, can normal power supply the but zone of dead electricity.

3. quick service restoration method as claimed in claim 1 is characterized in that, in the described step (1), when meeting following condition, starts the service restoration flow process:

After A, risk-aversion control finish, judged whether that load need restore electricity, if desired, started described service restoration controlling schemes;

After B, emergency control finish, judged whether that load need restore electricity, if desired, started described service restoration controlling schemes;

C, manually change original operational mode and finish after, judged whether that load need restore electricity, if desired, start described service restoration controlling schemes;

D, when starting service restoration instruction or system and detect regional that needs restore electricity, start described service restoration controlling schemes according to the operator.

4. quick service restoration method as claimed in claim 1 is characterized in that, the power distribution network operation information in the described step (2) is meant that the switch folding condition information of distribution network, each node of distribution network are in the voltage and current information before and after the service restoration; Described other information systems comprise data acquisition and supervisor control.

5. quick service restoration method as claimed in claim 1, it is characterized in that described step (3) service restoration rule comprises based on distribution network wiring type divides the quick service restoration of the conventional power supply of the realizing quick service restoration rule that contains distributed power source DG regular and that division realizes based on distribution network wiring type; Described quick service restoration rule of conventional power supply that divide to realize based on distribution network wiring type and the quick service restoration rule that contains distributed power source DG comprise the service restoration rule of the radial mode of connection of single supply, the service restoration rule of double loop parallel wires mode, single supply is from the service restoration rule of the looped network mode of connection, the hand in hand service restoration rule of the mode of connection of duplicate supply, the service restoration rule of the switching station mode of connection, N confession 1 is equipped with the service restoration rule of martingale mode, N power supply hand in hand the service restoration rule of the mode of connection and the service restoration rule of the latticed complicated mode of connection; Described certain rule/expertise comprises judges whether voltage and current is out-of-limit.

6. quick service restoration method as claimed in claim 1 is characterized in that, adopts following content to judge whether to need to optimize and adjust operational mode in the described step (5):

When changeing the load capacity of power supply source institute bringing onto load above described commentaries on classics power supply source, perhaps described non-fault dead electricity zone restores electricity the back voltage deviation above safety value, when perhaps carrying out the project setting operation, need be optimized analysis to executed power supply plan according to the operator command needs.

7. quick service restoration method as claimed in claim 2 is characterized in that, described risk-aversion control is meant when power distribution network is in risk status the prevention and control measure of taking; Described emergency control is meant when power distribution network is in a state of emergency, the control measure of taking.

8. quick service restoration method as claimed in claim 4 is characterized in that, the described service restoration rule that contains distributed power source DG comprises:

A, if distributed power source DG independent operating, but between distributed power source DG and local electrical network, automatic transfer equipment is arranged, at first rely on described automatic transfer equipment, employing islet operation pattern is enabled distributed power source DG to described non-fault dead electricity block supply;

B, if distributed power source DG and described distribution network system parallel running, but distributed power source DG is to described local electrical network no-output, the situation of exerting oneself in real time according to distributed power source DG, when distributed power source DG takes up the load in described non-fault dead electricity zone, enable distributed power source DG and adopt described islet operation pattern described non-fault dead electricity block supply; Enter the step (4) of service restoration method; When exerting oneself in real time of distributed power source can not take up local load, then keep the power failure state in described non-fault dead electricity zone; Or

If c distributed power source DG and system's parallel running and to described local electrical network output electric energy are enabled distributed power source DG described non-fault dead electricity zone are farthest restored electricity.

9. quick service restoration method as claimed in claim 5 is characterized in that, described local electrical network is for the partial electric grid that distributed power source is powered, the power distribution network by conventional power supply power supply that is connected with this partial electric grid;

Described automatic transfer equipment is meant the control appliance that is installed between distributed power source and the local electrical network, can select partial electric grid by described conventional power supply power supply by this equipment, perhaps by described distributed power source DG power supply;

Described islet operation pattern is meant to break away from big electrical network, by the pattern of the independently-powered operation of described distributed power source DG;

Described parallel running is meant described distributed power source DG is advanced local electrical network as a power supply parallel connection, with conventional power supply to local electric.

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