CN110890757A - Reactive compensation fault control device for transformer substation and fault control method thereof - Google Patents
Reactive compensation fault control device for transformer substation and fault control method thereof Download PDFInfo
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- CN110890757A CN110890757A CN201911222134.7A CN201911222134A CN110890757A CN 110890757 A CN110890757 A CN 110890757A CN 201911222134 A CN201911222134 A CN 201911222134A CN 110890757 A CN110890757 A CN 110890757A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention provides a reactive compensation fault control device for a transformer substation and a fault control method thereof. The failure control device includes: the fault detection module is used for detecting whether the reactive compensation unit has a fault or not; and the control module is used for generating a new capacitance switching instruction and sending the new capacitance switching instruction to the reactive power compensation end when the fault detection module detects that the reactive power compensation unit of the access circuit has a fault. According to the reactive compensation system for the transformer substation, which is provided by the invention, the plurality of reactive compensation units are arranged at the reactive compensation end, when any reactive compensation unit fails, the control module of the reactive compensation failure control device can generate a new capacitance switching instruction for reactive compensation, the influence on the bus voltage due to the damage of the reactive compensation unit of the access circuit is avoided, and the stability of a power grid is ensured.
Description
Technical Field
The invention relates to the technical field of reactive power compensation of a power grid, in particular to a reactive power compensation fault control device for a transformer substation and a fault control method thereof.
Background
In modern society, electric power becomes an indispensable factor in national life, and is closely related to the development of national economy and the progress of scientific technology, and now, the requirements of various aspects of national life on the quality of electric energy are continuously improved, and more new processes are applied to an electric power system. Reactance is inevitably generated in the power system regardless of power transportation or power consumption. Therefore, in the power grid, a great amount of reactive power loss is generated while active power flows, which is a great hidden danger for the safety of the power system.
Reactive compensation in a transformer substation is an indispensable component, a centralized compensation technology applied to the transformer substation is not greatly changed for decades at present, and the technical requirements under new potentials are more and more laggard, the same technical problems also exist in the centralized compensation of a user transformer substation, most of compensation devices of the transformer substation cannot normally operate due to the laggard technology, the main reason is that the problems of switching modes, grouping and the like adopted by the traditional centralized compensation and the automation degree are laggard, the normal safe and stable operation of a power system is seriously influenced, and once the compensation devices are damaged, the corresponding reactive compensation cannot be performed completely, so that the centralized compensation technology of the transformer substation is urgently needed to be renovated to meet the requirements of the stable operation and high-efficiency equipment maintenance of the reactive compensation devices in a new power utilization environment.
Disclosure of Invention
Based on the above situation, the present invention is directed to a reactive power compensation fault control apparatus and a fault control method for a transformer substation, so as to solve the above problems of the existing transformer substation.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a reactive compensation fault control device for a transformer substation, which is used for carrying out fault control on a reactive compensation system, wherein the reactive compensation system comprises a master control end and a reactive compensation end, the reactive compensation end carries out reactive compensation on the transformer substation in a way of accessing a capacitor, the master control end is used for acquiring a reactive compensation amount to be compensated on a bus of the transformer substation, generating a capacitor switching instruction according to the reactive compensation amount to be compensated and sending the capacitor switching instruction to the reactive compensation end, the reactive compensation end comprises a unit control module and a plurality of reactive compensation units, and the unit control module is used for receiving the capacitor switching instruction and controlling one or more access circuits in the plurality of reactive compensation units according to the capacitor switching instruction;
the failure control device includes:
the fault detection module is used for detecting whether the reactive compensation unit has a fault;
and the control module is used for generating a new capacitance switching instruction and sending the new capacitance switching instruction to the reactive power compensation end when the fault detection module detects that the reactive power compensation unit of the access circuit breaks down.
Preferably, the fault detection module comprises:
the first fault detection unit is used for detecting whether the reactive compensation unit of the access circuit is in fault;
the second fault detection unit is used for detecting whether the reactive compensation unit which is not connected into the circuit has a fault;
the control module includes:
the first control unit is used for generating a new capacitance switching instruction when the first fault detection unit detects that the reactive compensation unit of the access circuit has a fault;
and the second control unit is used for generating an alarm signal when the second fault detection unit detects that the reactive compensation unit of the non-access circuit has a fault.
Preferably, the master control end comprises:
the bus voltage acquisition module is used for acquiring the bus voltage of the transformer substation;
the bus current acquisition module is used for acquiring bus current of the transformer substation;
the signal processing module is used for processing the bus voltage signal acquired by the bus voltage acquisition module and the bus current signal acquired by the bus current acquisition module;
and the main control module is used for comparing the processing result of the signal processing module with the standard value stored in the signal processing module to obtain the reactive power to-be-compensated quantity, generating a capacitance switching instruction according to the reactive power to-be-compensated quantity, and sending the capacitance switching instruction to the reactive power compensation end.
Preferably, each reactive compensation unit comprises an intelligent switch for controlling the reactive compensation unit to be connected to or disconnected from a circuit, and the unit control module is configured to receive the capacitance switching instruction, execute an action of controlling the intelligent switches of the reactive compensation units to be switched on and off according to the capacitance switching instruction, and feed back a signal indicating that the instruction execution is completed to the main control module.
A second aspect of the present invention provides a reactive compensation fault control method for a substation, which employs the reactive compensation fault control apparatus described above, and the control method includes:
s1, detecting whether the reactive compensation unit has a fault, entering S2 when the fault is detected, and otherwise, continuing to detect;
s2, judging whether the reactive power compensation unit with the fault is connected to the circuit, if so, entering S3, otherwise, carrying out S4;
s3, generating a new capacitance switching instruction and sending the new capacitance switching instruction to the reactive power compensation end;
and S4, generating an alarm signal.
Preferably, S3 includes:
and searching whether a reactive compensation unit or a reactive compensation unit combination with the compensation quantity equal to that of the reactive compensation unit with the fault exists in the reactive compensation units which are not connected into the circuit, and if so, controlling the reactive compensation unit or the reactive compensation unit combination with the equal compensation quantity to be connected into the circuit.
Preferably, the method for searching whether a reactive compensation unit or a reactive compensation unit combination with the compensation amount equal to that of the reactive compensation unit with the fault exists in the reactive compensation units which are not connected into the circuit comprises the following steps:
the searching step is divided into a first level searching step, a second level searching step and … according to the compensation quantity of each reactive compensation unit which is not connected into the circuit, wherein,
the first-stage searching step is to search each non-accessed reactive compensation unit one by one;
the second-level searching step is to search the pairwise combination of each non-accessed reactive compensation unit;
the third-level searching step is to search the combination of three non-accessed reactive compensation units;
…；
and comparing the compensation quantity of the reactive compensation unit with the preset value to determine which level of the searching step the searching is started from.
Preferably, the method for comparing the compensation amount of the reactive compensation unit with the preset value to determine from which stage the search is started comprises:
the preset values comprise a first preset value, a second preset value, a third preset value and …;
when the compensation quantity of the reactive compensation unit with the fault is smaller than the first preset value, determining to start searching from the first-level searching step;
when the compensation quantity of the reactive compensation unit with the fault is larger than or equal to the first preset value and smaller than the second preset value, determining to start searching from the secondary searching step;
when the compensation quantity of the reactive compensation unit with the fault is larger than or equal to the second preset value and smaller than the third preset value, determining to start searching from the three-level searching step;
…；
the first preset value is the compensation amount of the reactive compensation unit with the largest compensation amount in each non-connected reactive compensation unit, the second preset value is the sum of the compensation amounts of the two reactive compensation units with the largest compensation amounts in each non-connected reactive compensation unit, and the third preset value is the sum … of the compensation amounts of the three reactive compensation units with the largest compensation amounts in each non-connected reactive compensation unit.
Preferably, when the compensation amount of the reactive compensation unit with the fault is greater than or equal to a maximum preset value, all the reactive compensation units which are not connected are directly controlled to be connected into the circuit, and the maximum preset value is the sum of the compensation amounts of all the reactive compensation units which are not connected.
Preferably, if there is no reactive compensation unit or reactive compensation unit combination having a compensation amount equal to that of the failed reactive compensation unit, the reactive compensation unit or reactive compensation unit combination having a compensation amount closest to that of the failed reactive compensation unit among the reactive compensation units not connected to the circuit is controlled to be connected to the circuit.
Preferably, if there is no reactive compensation unit or reactive compensation unit combination with compensation quantity equal to that of the reactive compensation unit with the fault, the reactive compensation total quantity is calculated, and all the reactive compensation units without the fault are searched according to the reactive compensation total quantity to generate the new capacitor switching instruction.
Preferably, if there is no reactive compensation unit or reactive compensation unit combination with compensation amount equal to that of the reactive compensation unit with fault, adding the compensation amount of one of the reactive compensation units without fault of the access circuit to the compensation amount of the reactive compensation unit with fault to obtain a scheduled compensation amount, searching whether there is a reactive compensation unit or reactive compensation unit combination with compensation amount equal to the scheduled compensation amount in the reactive compensation unit without access circuit, if yes, controlling the reactive compensation unit or reactive compensation unit combination with equal compensation amount to access the circuit, and simultaneously controlling one of the reactive compensation units without fault of the access circuit to disconnect the circuit, otherwise,
and adjusting the number of the fault-free reactive power compensation units of the access circuit in the scheduling compensation amount and continuing searching.
The reactive compensation system for the transformer substation is provided with the plurality of reactive compensation units at the reactive compensation end, the master control end can control each reactive compensation unit to be connected into or disconnected from a circuit according to needs, and the reactive compensation system has the advantages of being small in grading, convenient to install, large in available space, convenient to manage and maintain and the like.
Drawings
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:
fig. 1 is a system block diagram of a reactive power compensation system for a substation according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a reactive compensation unit according to an embodiment of the present invention;
fig. 3 is a system block diagram of a reactive compensation fault control apparatus according to an embodiment of the present invention;
fig. 4 is a flowchart of a reactive compensation fault control method according to an embodiment of the present invention.
In the figure:
100. a master control end; 101. a bus voltage acquisition module; 102. a bus current collection module; 103. a signal processing module; 104. a main control module;
200. a reactive compensation end; 201. a reactive compensation unit; 202. a unit control module;
300. a fault detection module; 301. a first failure detection unit; 302. a second failure detection unit;
400. a control module; 401. a first control unit; 402. a second control unit.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the nature of the present invention, well-known methods, procedures, and components have not been described in detail.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The compensation of the transformer substation on the power grid system mainly has the functions of compensating the loss of reactive power from a power supply area, improving the bus voltage and keeping the system voltage in a relatively stable interval; this is also an important guarantee link for the power quality of the power supply system, but the load on the user side is constantly changed, so the required reactive gaps are different, and then the reactive compensation needs to make corresponding actions, and the corresponding actions are responded by using a more reasonable compensation capacity and a quick response is needed; the compensation equipment of the transformer substation is obviously impossible to operate at present, firstly, the switching times of the switches are limited, the transformer substation cannot be subjected to concentrated compensation and frequent switching, the capacity of the equipment cannot be adjusted in real time, secondly, the grouping capacity is extremely poor, the situation that the compensation equipment cannot be switched to meet the reactive power requirement of a system is often caused, and the compensation equipment can be over-compensated by switching one group, so that the system voltage is too high, the equipment can be burned, and even more serious power failure accidents of the transformer substation can be caused.
In view of the above problem, the present application provides a reactive power compensation system for a transformer substation, as shown in fig. 1, the system includes a master control end 100 and a reactive power compensation end 200, and the reactive power compensation end 200 performs reactive power compensation on the transformer substation in a manner of accessing a capacitor. The master control end 100 is used for obtaining a reactive compensation amount to be compensated on a bus of the transformer substation, generating a capacitance switching instruction according to the reactive compensation amount to be compensated, and sending the capacitance switching instruction to the reactive compensation end 200, wherein the reactive compensation end 200 comprises a unit control module 202 and a plurality of reactive compensation units 201, and the unit control module 202 is used for receiving the capacitance switching instruction and controlling one or more access circuits in the plurality of reactive compensation units 201 according to the capacitance switching instruction so as to perform proper reactive compensation on the transformer substation. In a specific embodiment, as shown in fig. 2, 2 loops are built in the reactive power compensation unit 201, wherein a primary loop sequentially includes a reactor, an intelligent switch, a current transformer, and a parallel capacitor, a secondary loop includes a detection CT travel switch, a switching coil, and the like, and a working principle of the primary loop is as follows: after the reactive compensation end 200 is electrified, the current firstly carries out inrush current and harmonic suppression through the reactor, so as to protect the device burning loss caused by the inrush current and prevent the capacitor from overvoltage operation; the intelligent switch is provided with a state sampling contact switch in a linkage manner to acquire a switch state, the switch state can be normally closed by default, and after the switch is switched on, the contact is normally open; before the intelligent switch is introduced into the capacitor, a sampling current CT is arranged to obtain a current signal of the item so as to monitor the running state of the capacitor; wherein the terminals define: HZ + and HZ-are control switch loops; ZT and COM are in on-off state; ia. Ib, Ic and In are three-phase capacitance and single-phase operation current.
Specifically, as shown in fig. 1, the general control end 100 includes:
the bus voltage acquisition module 101 is used for acquiring bus voltage of the transformer substation;
the bus current acquisition module 102 is used for acquiring bus current of the transformer substation;
the signal processing module 103 is configured to process the bus voltage signal acquired by the bus voltage acquisition module 101 and the bus current signal acquired by the bus current acquisition module 102;
and the main control module 104 is configured to compare the processing result of the signal processing module 103 with a standard value stored therein to obtain a reactive compensation amount, generate a capacitance switching instruction according to the reactive compensation amount, and send the capacitance switching instruction to the reactive compensation terminal 200.
Each reactive power compensation unit 201 comprises an intelligent switch for controlling the reactive power compensation unit 201 to be connected to or disconnected from a circuit, and the unit control module 202 is used for receiving a capacitance switching instruction, executing the action of controlling the on and off of the intelligent switches of the reactive power compensation units 201 according to the capacitance switching instruction, and feeding back a signal of finishing the execution of the instruction to the main control module 104.
Because be provided with a plurality of reactive compensation unit 201 at reactive compensation end 200, so, total accuse end 100 can control each reactive compensation unit 201 access circuit or with the circuit disconnection as required, have hierarchical less, simple to operate, usable space is great, a great deal of practical advantage characteristics such as the management maintenance of being convenient for, every reactive compensation unit 201 all includes intelligent switch, can satisfy frequent switching needs, this voltage quality fine management that just gives the transformer substation provides technical guarantee.
The process of obtaining the bus voltage and the bus current, and the process of processing the bus voltage and the bus current to obtain the processing result are the same as those in the prior art, and are not described herein again.
The disposable switching mode that has now, in case the electric capacity of switching device damages, then whole reactive power compensator can take place to become invalid, and the maintenance is very difficult, and is consuming time longer, and this application owing to be provided with a plurality of reactive power compensation units 201, when partial reactive power compensation unit 201 wherein damages, can regenerate electric capacity switching instruction in order to satisfy reactive power compensation, specifically, as shown in fig. 3, this application provides a reactive power compensation fault control device for transformer substation, includes:
a fault detection module 300, configured to detect whether the reactive compensation unit 201 fails;
and the control module 400 is configured to generate a new capacitor switching instruction and send the new capacitor switching instruction to the reactive power compensation terminal 200 when the fault detection module 300 detects that the reactive power compensation unit 201 of the access circuit has a fault.
The fault detection module 300 may adopt any device for detecting whether the capacitor has a fault, which is the same as the prior art and is not described herein again. The fault detection module 300 may only detect whether the reactive compensation unit 201 of the access circuit is faulty, and since the voltage of the substation bus has a high change frequency in some cases, the capacitance switching may be frequently performed, that is, the reactive compensation unit 201 that is not connected to the circuit is likely to be controlled to be connected to the circuit soon, and based on this, the fault detection module 300 preferably includes:
a first fault detection unit 301, configured to detect whether the reactive compensation unit 201 of the access circuit has a fault;
the second fault detection unit 302 is used for detecting whether the reactive compensation unit 201 which is not connected into the circuit has a fault;
the control module 400 includes:
the first control unit 401 is configured to generate a new capacitance switching instruction when the first fault detection unit 301 detects that the reactive power compensation unit 201 of the access circuit fails;
and the second control unit 402 is configured to generate an alarm signal when the second fault detection unit 302 detects that the reactive power compensation unit 201 which is not connected to the circuit fails, so as to remind a worker to timely maintain or replace the failed reactive power compensation unit 201.
The control module 400 can be separately arranged, or can be integrated into the main control module 104 of the head control end 100.
Further, the present application also provides a reactive compensation fault control method for a substation, which uses the above reactive compensation fault control apparatus, as shown in fig. 4, the control method includes:
s1, detecting whether the reactive compensation unit 201 has a fault, entering S2 when the fault is detected, and otherwise, continuing to detect;
s2, judging whether the reactive power compensation unit 201 with the fault is connected to the circuit, if so, entering S3, otherwise, carrying out S4;
s3, generating a new capacitance switching instruction and sending the new capacitance switching instruction to the reactive power compensation end 200;
and S4, generating an alarm signal.
In the application, if the reactive power compensation unit 201 of the access circuit breaks down, a new capacitance switching instruction is generated to maintain the reactive power compensation amount equal to or close to the original value, so that the stability of the power grid is ensured, and if the reactive power compensation unit 201 of the non-access circuit breaks down, an alarm signal is generated to remind a worker to maintain or replace the reactive power compensation unit 201 in time.
In a specific embodiment, S3 includes:
and searching whether a reactive compensation unit 201 or a reactive compensation unit combination with the compensation quantity equal to that of the reactive compensation unit 201 with the fault exists in the reactive compensation units 201 which are not connected into the circuit, and if so, controlling the reactive compensation units 201 or the reactive compensation unit combination with the equal compensation quantity to be connected into the circuit.
The searching manner may be sequentially searched in a conventional manner, for example, each non-accessed reactive power compensation unit 201 is searched one by one, if there is no result satisfying the condition, each pair of non-accessed reactive power compensation units 201 is searched, and so on. In order to simplify the search process and improve the search efficiency, it is preferable that the search method of searching whether the reactive compensation unit 201 or the reactive compensation unit combination having the compensation amount equal to that of the failed reactive compensation unit 201 exists in the reactive compensation units 201 which are not connected to the circuit includes:
the searching step is divided into a first level searching step, a second level searching step, … according to the compensation amount of each reactive compensation unit 201 which is not connected to the circuit, wherein,
the first-stage searching step is to search each non-accessed reactive compensation unit 201 one by one;
the second-level searching step is to search the combinations of each non-accessed reactive compensation unit 201;
the third-level searching step is to search the combination of three of the non-accessed reactive compensation units 201;
…；
the compensation amount of the reactive compensation unit 201 with the fault is compared with a preset value to determine from which stage the search is started.
Specifically, the method for comparing the compensation amount of the reactive power compensation unit 201 with the preset value to determine from which level the search step starts includes:
the preset values comprise a first preset value, a second preset value, a third preset value and …;
when the compensation quantity of the failed reactive compensation unit 201 is smaller than the first preset value, determining to start searching from the first-level searching step;
when the compensation quantity of the failed reactive compensation unit 201 is greater than or equal to the first preset value and less than the second preset value, determining to start searching from the secondary searching step;
when the compensation quantity of the failed reactive compensation unit 201 is greater than or equal to the second preset value and is less than the third preset value, determining to start searching from the three-level searching step;
…；
the first preset value is the compensation amount of the reactive compensation unit 201 with the largest compensation amount in each non-connected reactive compensation unit 201, the second preset value is the sum of the compensation amounts of the two reactive compensation units 201 with the largest compensation amount in each non-connected reactive compensation unit 201, and the third preset value is the sum … of the compensation amounts of the three reactive compensation units 201 with the largest compensation amount in each non-connected reactive compensation unit 201.
By adopting the method, different search strategies can be selected according to the compensation quantity of different failed reactive compensation units 201, and some unnecessary search steps are omitted, so that the search efficiency is greatly improved.
Further, when the compensation amount of the reactive compensation unit 201 with the fault is greater than or equal to a maximum preset value, all the reactive compensation units 201 which are not connected are directly controlled to be connected into the circuit, and the maximum preset value is the sum of the compensation amounts of all the reactive compensation units 201 which are not connected. That is, when the compensation amount of the reactive power compensation unit 201 with a fault is larger than the sum of the compensation amounts of all the reactive power compensation units 201 which are not connected, it is not necessary to search again, and it is sufficient to directly control all the reactive power compensation units 201 which are not connected to be connected to the circuit.
If no reactive compensation unit 201 or reactive compensation unit combination meeting the condition exists after searching, a part of compensation quantity needs to be sacrificed or the switching strategy needs to be changed. In one embodiment, if there is no reactive compensation unit 201 or reactive compensation unit combination having the compensation amount equal to that of the failed reactive compensation unit 201, the reactive compensation unit 201 or reactive compensation unit combination having the compensation amount closest to that of the failed reactive compensation unit 201 in the reactive compensation unit 201 not connected to the circuit is controlled to be connected to the circuit. This will cause a certain change in the amount of reactive compensation, but will have a minor impact on the grid compared to the damage that occurs in the existing primary compensation arrangement.
In another embodiment, if there is no reactive compensation unit 201 or reactive compensation unit combination with compensation amount equal to that of the failed reactive compensation unit 201, the reactive compensation total amount is calculated, and all the non-failed reactive compensation units 201 are searched according to the reactive compensation total amount to generate the new capacitor switching instruction. That is, if the combination meeting the condition cannot be found in the reactive compensation units 201 that are not connected to the circuit, the reactive compensation units 201 connected to the circuit may also be added to the search line, and all the reactive compensation units 201 that are not failed are recombined to meet the total reactive compensation amount, so that the reactive compensation units 201 that are not connected to the circuit need to be controlled to be connected to the circuit and the reactive compensation units 201 that are connected to the circuit need to be controlled to be disconnected from the circuit.
In yet another embodiment, if there is no reactive compensation unit 201 or reactive compensation unit combination with the compensation amount equal to that of the failed reactive compensation unit 201, the compensation amount of one of the non-failed reactive compensation units 201 connected to the circuit is added to the compensation amount of the failed reactive compensation unit 201 to obtain a scheduled compensation amount, and whether there is a reactive compensation unit 201 or reactive compensation unit combination with the compensation amount equal to that scheduled compensation amount in the reactive compensation unit 201 not connected to the circuit is searched, if any, the reactive compensation unit 201 or the reactive compensation unit combination with the same compensation amount is controlled to be connected into the circuit, and simultaneously controlling one of the fault-free reactive power compensation units 201 of the access circuit to open the circuit, otherwise, adjusting the number of the fault-free reactive power compensation units 201 of the access circuit in the scheduling compensation amount and continuously searching. In this embodiment, instead of adding all the fault-free reactive power compensation units 201 of all the access circuits to the search line at one time as in the previous embodiment, one of the fault-free reactive power compensation units is selected to be added to the search line first, and if one of the fault-free reactive power compensation units 201 or a reactive power compensation unit combination satisfying the condition is not found yet, two of the fault-free reactive power compensation units are selected to be added to the search line, and so on, so that the switching times of the intelligent switch can be reduced to a certain extent.
Of course, it is understood that there may be a case where a combination satisfying the condition cannot be found in the foregoing two ways, and in this case, the reactive compensation unit 201 or the reactive compensation unit combination connected to the circuit, which has the compensation amount closest to that of the reactive compensation unit 201 in which the circuit is not connected, may be selected in a step back.
It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.
Claims (12)
1. A reactive compensation fault control device for a transformer substation is used for carrying out fault control on a reactive compensation system, and is characterized in that the reactive compensation system comprises a master control end and a reactive compensation end, the reactive compensation end carries out reactive compensation on the transformer substation in a capacitor access mode, the master control end is used for obtaining a reactive compensation amount to be compensated on a bus of the transformer substation, generating a capacitor switching instruction according to the reactive compensation amount to be compensated and sending the capacitor switching instruction to the reactive compensation end, the reactive compensation end comprises a unit control module and a plurality of reactive compensation units, and the unit control module is used for receiving the capacitor switching instruction and controlling one or more access circuits in the plurality of reactive compensation units according to the capacitor switching instruction;
the failure control device includes:
the fault detection module is used for detecting whether the reactive compensation unit has a fault;
and the control module is used for generating a new capacitance switching instruction when the fault detection module detects that the reactive power compensation unit of the access circuit breaks down, and sending the new capacitance switching instruction to the reactive power compensation end.
2. The reactive compensation fault control device for a substation of claim 1, wherein the fault detection module comprises:
the first fault detection unit is used for detecting whether the reactive compensation unit of the access circuit is in fault;
the second fault detection unit is used for detecting whether the reactive compensation unit which is not connected into the circuit has a fault;
the control module includes:
the first control unit is used for generating a new capacitance switching instruction when the first fault detection unit detects that the reactive compensation unit of the access circuit has a fault;
and the second control unit is used for generating an alarm signal when the second fault detection unit detects that the reactive compensation unit of the non-access circuit has a fault.
3. The reactive compensation fault control device for the substation according to claim 1 or 2, wherein the master control terminal comprises:
the bus voltage acquisition module is used for acquiring the bus voltage of the transformer substation;
the bus current acquisition module is used for acquiring bus current of the transformer substation;
the signal processing module is used for processing the bus voltage signal acquired by the bus voltage acquisition module and the bus current signal acquired by the bus current acquisition module;
and the main control module is used for comparing the processing result of the signal processing module with the standard value stored in the signal processing module to obtain the reactive power to-be-compensated quantity, generating a capacitance switching instruction according to the reactive power to-be-compensated quantity, and sending the capacitance switching instruction to the reactive power compensation end.
4. The reactive compensation fault control device for the transformer substation according to claim 1 or 2, wherein each reactive compensation unit comprises an intelligent switch for controlling the reactive compensation unit to be connected to or disconnected from a circuit, the unit control module is configured to receive the capacitor switching instruction, execute an action of controlling the intelligent switches of the reactive compensation units to be switched on and off according to the capacitor switching instruction, and feed back a signal indicating that the instruction is executed to the main control module.
5. A reactive compensation fault control method for a substation, characterized in that the reactive compensation fault control device of any one of claims 1 to 4 is adopted, and the control method comprises the following steps:
s1, detecting whether the reactive compensation unit has a fault, entering S2 when the fault is detected, and otherwise, continuing to detect;
s2, judging whether the reactive power compensation unit with the fault is connected to the circuit, if so, entering S3, otherwise, carrying out S4;
s3, generating a new capacitance switching instruction and sending the new capacitance switching instruction to the reactive power compensation end;
and S4, generating an alarm signal.
6. The reactive compensation fault control method for a substation according to claim 5, wherein S3 includes:
and searching whether a reactive compensation unit or a reactive compensation unit combination with the compensation quantity equal to that of the reactive compensation unit with the fault exists in the reactive compensation units which are not connected into the circuit, and if so, controlling the reactive compensation unit or the reactive compensation unit combination with the equal compensation quantity to be connected into the circuit.
7. The reactive compensation fault control method for the substation according to claim 6, wherein the search method for searching whether a reactive compensation unit or a combination of reactive compensation units having a compensation amount equal to that of the faulty reactive compensation unit exists in the reactive compensation units not connected to the circuit comprises:
the searching step is divided into a first level searching step, a second level searching step and … according to the compensation quantity of each reactive compensation unit which is not connected into the circuit, wherein,
the first-stage searching step is to search each non-accessed reactive compensation unit one by one;
the second-level searching step is to search the pairwise combination of each non-accessed reactive compensation unit;
the third-level searching step is to search the combination of three non-accessed reactive compensation units;
…；
and comparing the compensation quantity of the reactive compensation unit with the preset value to determine which level of the searching step the searching is started from.
8. The reactive compensation fault control method for the substation according to claim 7, wherein the method for comparing the compensation amount of the faulted reactive compensation unit with the preset value to determine from which level the search step starts comprises:
the preset values comprise a first preset value, a second preset value, a third preset value and …;
when the compensation quantity of the reactive compensation unit with the fault is smaller than the first preset value, determining to start searching from the first-level searching step;
when the compensation quantity of the reactive compensation unit with the fault is larger than or equal to the first preset value and smaller than the second preset value, determining to start searching from the secondary searching step;
when the compensation quantity of the reactive compensation unit with the fault is larger than or equal to the second preset value and smaller than the third preset value, determining to start searching from the three-level searching step;
…；
the first preset value is the compensation amount of the reactive compensation unit with the largest compensation amount in each non-connected reactive compensation unit, the second preset value is the sum of the compensation amounts of the two reactive compensation units with the largest compensation amounts in each non-connected reactive compensation unit, and the third preset value is the sum … of the compensation amounts of the three reactive compensation units with the largest compensation amounts in each non-connected reactive compensation unit.
9. The reactive compensation fault control method for a substation according to claim 8, wherein the switching in of all non-switched-in reactive compensation units to the circuit is directly controlled when the compensation amount of the faulty reactive compensation unit is greater than or equal to a maximum preset value, the maximum preset value being the sum of the compensation amounts of all non-switched-in reactive compensation units.
10. The reactive compensation fault control method for a substation according to any one of claims 6 to 9, wherein if there is no reactive compensation unit or combination of reactive compensation units having a compensation amount equal to that of the faulty reactive compensation unit, the reactive compensation unit or combination of reactive compensation units, of the reactive compensation units not connected to the circuit, having a compensation amount closest to that of the faulty reactive compensation unit is controlled to be connected to the circuit.
11. The reactive compensation fault control method for the transformer substation according to any one of claims 6 to 9, wherein if there is no reactive compensation unit or combination of reactive compensation units with compensation amount equal to that of the failed reactive compensation unit, a reactive compensation total amount is calculated, and all non-failed reactive compensation units are searched according to the reactive compensation total amount to generate the new capacitance switching command.
12. The reactive compensation fault control method for the substation according to any one of claims 6 to 9, wherein if there is no reactive compensation unit or combination of reactive compensation units having a compensation amount equal to that of the faulty reactive compensation unit, adding the compensation amount of one of the non-faulty reactive compensation units of the access circuit to that of the faulty reactive compensation unit to obtain a scheduled compensation amount, finding whether there is a reactive compensation unit or combination of reactive compensation units having a compensation amount equal to that of the scheduled compensation amount in the reactive compensation units of the non-access circuit, if there is, controlling the reactive compensation unit or combination of reactive compensation units having an equal compensation amount to access the circuit, and simultaneously controlling one of the non-faulty reactive compensation units of the access circuit to open the circuit, otherwise,
and adjusting the number of the fault-free reactive power compensation units of the access circuit in the scheduling compensation amount and continuing searching.
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