CN106655215A - Reactive power compensation equipment switch optimization method based on double-queue method for source network load - Google Patents

Abstract

The invention discloses a method for implementing a reactive power compensation equipment switch optimization strategy based on a double-queue method for friendly interaction of source network load, and belongs to the field of safety control of electrical power system. According to the method, the switch optimization of reactive power compensation equipment is realized by adopting the double-queue method according to the queue principle of ''first-in first-out, and last-in last-out''. With capacitor groups as an example, the capacitor groups belonging to the same controllable area are divided into two queues according to ''logout'' and ''switch'' attributes and are sorted in sequence, and sequence control is carried out on the switch of the capacitor groups according to a sequence access mode in the two queues. By means of this switch optimization strategy, the use conditions of all reactive power compensation equipment can be globally considered, thereby avoiding the situation of no response during real-time control caused by the long-term unuse of some reactive power compensation equipment and supporting the reactive flexible adjustment of friendly interaction of the source network load.

Description

An optimization method for switching reactive power compensation equipment based on the double-queue method suitable for source network loads

technical field

The invention belongs to the field of power system safety control, and relates to a method for implementing a reactive power compensation equipment switching optimization strategy based on a double-queue method suitable for friendly interaction between a source network and a load.

Background technique

With the development of source-grid-load friendly interaction technology, reactive power optimization and control is particularly important on the distribution network side. There are two traditional methods of voltage regulation, one is to adjust through the transformation ratio of the on-load voltage regulating transformer; the other is to adjust the reactive power compensation equipment, among which the control of capacitor banks is the most common. Reactive power compensation or voltage regulation of the power grid is realized by putting in or out of the capacitor bank. However, usually when switching capacitor banks, only a few groups are frequently operated, and most of them are not frequently operated. This leads to the fact that some capacitor banks have not been put into use due to long-term vacancy, and when they need to be put into control due to special circumstances, these capacitor banks refuse to operate, resulting in the failure of the reactive power compensation device to be put into operation. Once the reactive power compensation device fails to participate in switching in time, the voltage around the corresponding distribution network will fluctuate, low or high, seriously affecting the power quality. Therefore, it is urgent to comprehensively consider the optimal switching strategy of reactive power compensation equipment in the distribution network to avoid the situation of refusing to respond to real-time control caused by some reactive power compensation equipment not participating in the control for a long time, and to support the friendly interaction between the source network and the load. Flexible adjustment of reactive power.

Contents of the invention

The purpose of the present invention is to provide a reactive power compensation equipment switching optimization strategy implementation method based on the double queue method that is suitable for the friendly interaction between the source network and the load, so as to avoid the refusal of real-time emergency control caused by some reactive power compensation equipment not being used for a long time If there is no response, the reactive power compensation of the system is insufficient.

The technical scheme adopted in the present invention is:

A reactive power compensation equipment switching optimization method suitable for source network loads based on a double queue method, characterized in that reactive power compensation equipment belonging to the same controllable area is divided into two queues, one of which is an exit group, and the other One queue is the casting group, and the reactive power compensation equipment exits and enters in the two queues according to the first-in-first-out method. The out-queue end and the in-queue end of the exit group are connected and lined up, so that each reactive power compensation device in the two queues forms a cycle when they exit and enter in the two queues.

The withdrawal group is queue L, and the input group is queue M. Dynamically number all reactive power compensation equipment in queues L and M. The queue L is L1, L2,...,L(i); the queue M is M1, M2, ...,M(j);

In the withdrawal group, the L(i) side is the entry end, and the L1 side is the exit end; in the throwing group, the M(j) side is the entry end, and the M1 side is the exit end.

When the reactive power compensation equipment is put into operation, the corresponding number of reactive power compensation equipment is selected from the outgoing end of the queue L first, and the input control is implemented, and the incoming end of the queue M enters the queue M, and the queues L and M are dynamically numbered in sequence .

If the reactive power compensation equipment from the output end of the queue L fails to be put into operation, the reactive power compensation equipment will be removed from the queue L and the queue M for maintenance, and the next reactive power compensation will be selected again from the output end of the queue L The device is input and enters the queue M from the entry end of the queue M.

When exiting the reactive power compensation equipment, select the corresponding number of reactive power compensation equipment from the outgoing end of the queue M first, implement exit control, and enter the queue L from the incoming end of the queue L, and the queues L and M will be dynamically numbered in sequence .

The reactive power compensation equipment is a capacitor bank.

The beneficial effect that the present invention reaches:

The invention provides a reactive power compensation equipment switching optimization method based on the double queue method suitable for the friendly interaction between the source network and the load. switching optimization. Taking capacitor banks as an example, the capacitor banks belonging to the same controllable area are divided into two queues according to the attributes of "exit" and "in-switching", and they are sorted sequentially. method for sequence control. Through this optimized switching strategy, the use of all reactive power compensation equipment can be considered globally. Once there is an abnormality in the routine control of some equipment, it can be repaired in time and switched to the next group of equipment for control; If the power compensation equipment is not used for a long time, it will not respond during real-time emergency control, and the reactive power compensation of the system will be insufficient. The switching optimization strategy of reactive power compensation equipment provided by this method can effectively support the reactive power flexible adjustment of friendly interaction between the source network and the load.

Description of drawings

Figure 1 is a schematic diagram of the implementation of the capacitor bank switching optimization strategy based on the double-queue method suitable for the friendly interaction between the source network and the load.

detailed description

The method of the present invention adopts the double-queue method to realize the switching optimization of the reactive power compensation equipment according to the queue principle of "first in, first out, last in, last out", so as to ensure that the reactive power compensation equipment can take into account the status of each group of equipment when it is put into or withdrawn. Input and exit frequency. It is convenient to detect abnormalities in time during the switching process of conventional reactive power compensation equipment and carry out maintenance, so as to avoid insufficient reactive power compensation of the system caused by some reactive power compensation equipment refusing to operate or respond during emergency control. The specific steps are as follows (as shown in Figure 1, taking the switching on and off of the capacitor bank as an example):

(1) Divide the capacitor banks in the control area into "exiting capacitor banks" and "in-investment capacitor banks" according to their attributes, and build two queues L and M respectively.

(2) Dynamically number the capacitor banks in the L and M queues, and exit the capacitor bank queue L as L1, L2,...,L(i); in the capacitor bank queue M as M1,M2,...,M(j ).

(3) Define the exiting capacitor bank queue L(i) side as the queue-in direction, L1 side as the queue-out direction; the capacitor bank queue M(j) side as the queue-in direction, and the M1 side as the queue-out direction.

(4) If it is necessary to put in a capacitor bank, select the corresponding number of capacitor banks from the outbound direction of the L queue first, implement the input control, and enter the M queue from the inbound direction of the M queue, and proceed according to the original queue order of L and M Re-number dynamically.

(5) If the input control of the capacitor bank coming out of the queue from the L queue fails, the capacitor bank will be removed from the L and M queues for maintenance. And select the capacitor bank again from the out-queue direction of the L queue for control, and enter the M-queue from the in-queue direction.

(6) If it is necessary to exit the capacitor bank, select the corresponding number of capacitor banks from the exiting direction of the M queue first, implement exit control, and enter the L queue from the entering direction of the L queue, and proceed according to the original queue order of L and M Re-number dynamically.

(7) All capacitor banks of queues L and M implement input and exit control according to the optimized sequence of entering and leaving the queue, and dynamically number the elements of the two queues in turn according to the principle of circular replenishment, and average all controllable capacitor banks as much as possible input and exit frequencies. Make sure that the capacitor bank will not refuse to move or respond during emergency control, which will cause insufficient reactive power compensation of the system.

According to the method of the present invention, the capacitor banks belonging to the same controllable area are divided into two queues according to the attributes of "exit" and "in-switching", and they are sorted and numbered sequentially. method for sequence control. Considering the average switching times of the switched reactive power compensation equipment, the equipment that has not been switched is given priority over the equipment that has been switched to ensure that all reactive power compensation equipment can operate normally. The use of all reactive power compensation equipment is considered in the overall situation, avoiding the situation that some reactive power compensation equipment does not use for a long time, which causes the situation of refusing to move or respond during real-time control, and supports the reactive power flexible adjustment of the friendly interaction between the source network and the load.

Claims (6)

1. it is a kind of based on deque's method be applied to source net lotus reactive-load compensation equipment switching optimization method, it is characterised in that will belong to Be divided into two queues in the reactive-load compensation equipment of same zone of control, one of queue to exit group, another queue be Throwing group, reactive-load compensation equipment is exited and put in two queues according to the mode of first in first out, and that exits group goes out team End connects queuing with the team end of entering in throwing group, going out team end and exiting the team end of entering organized and connect queuing in throwing group, makes two queues In each reactive-load compensation equipment circulation is formed when exiting in two queues and putting into.

2. it is according to claim 1 based on deque's method be applied to source net lotus reactive-load compensation equipment switching optimization method, Be queue M in throwing group characterized in that, exiting group for queue L, to queue L, M in all reactive-load compensation equipments enter Mobile state Numbering, queue L is L1, L2 ..., L (i)；Queue M be M1, M2 ..., M (j)；

In exiting group, L (i) sides are that, into team end, L1 sides are team end；In throwing group, M (j) sides are that, into team end, M1 sides are team End.

3. it is according to claim 2 based on deque's method be applied to source net lotus reactive-load compensation equipment switching optimization method, Characterized in that, during input reactive-load compensation equipment, preferentially from the reactive-load compensation equipment that team end selects respective numbers that goes out of queue L, Practicing system is controlled, and enters enqueue M by the team end of entering of queue M, and queue L, M re-start in order dynamic number.

4. it is according to claim 3 based on deque's method be applied to source net lotus reactive-load compensation equipment switching optimization method, If characterized in that, from queue L go out team bring out come reactive-load compensation equipment input failure, by the reactive-load compensation equipment from team Reject in row L and queue M and overhauled, and select next reactive-load compensation equipment to be put into again from the team end that goes out of queue L, and Enqueue M is entered by the team end of entering of queue M.

5. it is according to claim 2 based on deque's method be applied to source net lotus reactive-load compensation equipment switching optimization method, Characterized in that, when exiting reactive-load compensation equipment, preferentially from the reactive-load compensation equipment that team end selects respective numbers that goes out of queue M, Control is exited in enforcement, and enters enqueue L by the team end of entering of queue L, and queue L, M re-start in order dynamic number.

6. it is according to claim 1 based on deque's method be applied to source net lotus reactive-load compensation equipment switching optimization method, Characterized in that, the reactive-load compensation equipment is capacitor bank.