CN109004655B - Group control system and control method for static var generator - Google Patents
Group control system and control method for static var generator Download PDFInfo
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- CN109004655B CN109004655B CN201710424259.2A CN201710424259A CN109004655B CN 109004655 B CN109004655 B CN 109004655B CN 201710424259 A CN201710424259 A CN 201710424259A CN 109004655 B CN109004655 B CN 109004655B
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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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- 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
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Abstract
The group control system comprises a plurality of static var generator groups, and each group comprises a plurality of static var generators. The method comprises the following steps: monitoring a plurality of static var generators and acquiring each utilization rate; judging whether the utilization rate reaches a preset utilization rate, using a static var generator with the utilization rate not reaching the preset utilization rate as a supplementary output object, and using a static var generator with the utilization rate reaching the preset utilization rate as a supplementary input object; and controlling the auxiliary output object to compensate the load corresponding to the auxiliary input object according to the dispatching mode of the group control system. The compensation range can be expanded and the compensation effect can be improved; on the other hand, the utilization rate of the equipment is improved, the service life of the equipment is prolonged, and the maintenance cost is reduced; on the other hand, excessive equipment is avoided, and the investment cost is reduced.
Description
Technical Field
The disclosure relates to the technical field of power supply, and particularly relates to a group control method for a group control system of static var generators and the group control system of the static var generators.
Background
In the modern industrial production, electric energy is used as a main power source, most electric equipment in a power grid works according to the electromagnetic induction principle, such as a motor, a transformer and the like, and the equipment consumes a large amount of reactive power while consuming active power, so that the power factor of the system is seriously low. If the compensation is not carried out, a large amount of electric energy is consumed in vain, and the power factor does not reach the standard and is punished by a power department.
Reactive compensation is an effective improvement measure and is applied to various occasions for supplying and distributing power. The compensation method usually adopted is to add SVG (Static Var Generator) before each electric device which needs reactive compensation, and the compensation power of the SVG reactive compensation device should be greater than the reactive peak value of production. The method can compensate the reactive power of all high-low voltage lines and power transformers before installation, and has the advantages of large compensation range and good compensation effect. However, this presents certain problems: firstly, too many devices are additionally arranged, and the investment cost is too high; second, reactive power is not always at peak, SVG does not need to run fully for a significant amount of time; thirdly, when the compensated equipment is overhauled or stops working, the SVG reactive power compensation equipment can be cut off and stops running, so that the resource is idle and wasted.
Therefore, it is necessary to research a group control method for a group control system of static var generators and a group control system of static var generators.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide a group control method for a group control system of static var generators and a group control system of static var generators, thereby overcoming, at least to some extent, one or more of the problems due to the limitations and disadvantages of the related art.
According to an aspect of the present disclosure, there is provided a control method for a group control system of static var generators, the group control system of static var generators including a plurality of groups of static var generators, each group of static var generators including a plurality of static var generators, the control method including:
monitoring a plurality of static var generators to obtain the utilization rate of each static var generator;
judging whether the utilization rate reaches a preset utilization rate or not, and taking the static var generator as a supplementary output object when judging that the utilization rate of the static var generator does not reach the preset utilization rate;
when the utilization rate of the static var generator is judged to reach the preset utilization rate, the static var generator is used as a supplementary input object; and
and controlling the auxiliary output object to compensate the load corresponding to the auxiliary input object according to the dispatching mode of the SVG group control system.
In an exemplary embodiment of the present disclosure, the scheduling mode includes:
one or more of local compensation, intra-group assistance, and inter-group assistance.
In an exemplary embodiment of the present disclosure, in the local compensation mode, the static var generator is only a supplementary input object.
In an exemplary embodiment of the disclosure, in the intra-group complementary mode, the controlling the complementary output object to compensate for the load corresponding to the complementary input object includes:
calculating the capacity of each auxiliary output object in the same group, which can be used for compensating the auxiliary input object, to be a first capacity;
calculating the capacity of each auxiliary input object in the group, which needs to be compensated, as a second capacity;
determining whether the sum of all of the first capacities in the group is greater than the sum of all of the second capacities in the group;
when the first capacity sum of all the auxiliary output objects in the group is judged to be larger than the second capacity sum of all the auxiliary input objects in the group, controlling each auxiliary output object to compensate the load compensated by the auxiliary input object according to a first preset rule;
and when judging that the sum of all the first capacities in the group is not greater than the sum of all the second capacities in the group, increasing the utilization rate of each supplementary output object to the preset utilization rate, calculating the sum of all the second capacities of the group after increasing the utilization rate of each supplementary output object to the preset utilization rate, and simultaneously sending an inter-group supplementary request.
In an exemplary embodiment of the present disclosure, in the inter-group complementary mode, the controlling the complementary output object to compensate for the load corresponding to the complementary input object includes:
detecting all the first capacity sums of the groups of the current priority from the highest priority; when detecting that all the first capacity sums of the group are not smaller than all the second capacity sums of the group, compensating the load compensated by the supplementary input objects of the group by each supplementary output object in the group according to the first preset rule;
when detecting that all the first capacity sums of the groups under the current priority are smaller than all the second capacity sums of the groups, increasing the utilization rate of each supplementary output object in the group to the preset utilization rate and taking the group of the next priority as the group of the current priority.
In an exemplary embodiment of the disclosure, the first preset rule is to compensate the load compensated by the help input object according to a proportion of each first capacity of the current group to a sum of all first capacities of the current group.
In an exemplary embodiment of the present disclosure, the first preset rule includes adjusting the load compensated for the helper input object according to the following formula:
QSVG1＝sumR*(FSVG1/sumF)＝sumR*(FSVG1/(FSVG1+FSVG2+…+FSVGn))
wherein Q isSVG1Sum R is the sum of all the second capacities of the helper input objects of the group, FSVG1、FSVG2…FSVGnFor each of the first capacities of the current group, sumF is a sum of all the first capacities of the current group.
In an exemplary embodiment of the present disclosure, the preset usage rate is an operation usage rate that defines that the static var generator is lower than when operating at full load.
In an exemplary embodiment of the present disclosure, monitoring the plurality of static var generators includes:
and monitoring a plurality of static var generators through a SCADA system.
In an exemplary embodiment of the present disclosure, the method further comprises:
configuring one or more of the first preset rule, the preset usage rate, and the priority of the group in response to an external input.
According to another aspect of the present disclosure, there is provided a group control system of static var generators, including:
the system comprises a state monitoring module, a state judging module and a state judging module, wherein the state monitoring module is used for monitoring a plurality of static var generators and acquiring the utilization rate of each static var generator;
the judging module is used for judging whether the utilization rate of the static var generator reaches a preset utilization rate or not and determining the assistance type of the static var generator according to a judging result, wherein the assistance type comprises assistance input and assistance output; and
and the compensation control module is used for controlling the static var generator serving as a help output object to compensate the load corresponding to the static var generator serving as a help input object according to the dispatching mode of the static var generator group control system.
In an exemplary embodiment of the present disclosure, the determining module includes:
the first judgment unit is used for taking the static var generator as a help output object when judging that the utilization rate of the static var generator does not reach the preset utilization rate;
and the second judgment unit is used for taking the static var generator as a help input object when judging that the utilization rate of the static var generator reaches the preset utilization rate.
In an exemplary embodiment of the present disclosure, the scheduling mode includes:
one or more of local compensation, intra-group assistance, and inter-group assistance.
In an exemplary embodiment of the present disclosure, in the local compensation mode, the static var generator is only a supplementary input object.
The present disclosure provides a group control method for a group control system of static var generators and a group control system of static var generators, the group control system includes a plurality of groups of static var generators, each group includes a plurality of static var generators, the control method includes: monitoring the plurality of static var generators, acquiring each utilization rate, and judging whether the utilization rate reaches a preset utilization rate; taking the static var generator with the utilization rate not reaching the preset utilization rate as a supplementary output object, and taking the static var generator with the utilization rate reaching the preset utilization rate as a supplementary input object; and controlling the auxiliary output object to compensate the load corresponding to the auxiliary input object according to the dispatching mode of the group control system.
According to the technical scheme, the group control system and the control method for mutual help compensation between the static var generators have the advantages and positive effects that:
the method can acquire the equipment state of each static var generator in real time, and can freely compensate a single static var generator, a single group and a plurality of groups through corresponding dispatching modes. The device has the advantages that the device cannot cause long-term full load and overweight of single equipment, cannot cause low equipment utilization rate and excessive light load and idleness, and can furthest exert the efficiency of each piece of equipment, so that resources are reasonably allocated, the utilization rate of the equipment is effectively improved, and the service life of the equipment is prolonged. On one hand, the compensation range can be enlarged, and the compensation effect is improved; on the other hand, the idle waste of resources is avoided, the utilization rate of the equipment is improved, the service life of the equipment is prolonged, and the maintenance cost is reduced; on the other hand, excessive equipment is avoided, and the investment cost is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 schematically illustrates a flowchart of a group control method of a group control system of static var generators in an exemplary embodiment of the present disclosure.
Fig. 2 schematically illustrates a simulation block diagram of a group control system of static var generators in an exemplary embodiment of the present disclosure.
Fig. 3 schematically illustrates a scheduling concept diagram of the group control system of the static var generators in an exemplary embodiment of the present disclosure.
Fig. 4 schematically illustrates a scheduling flowchart of the group control system of the static var generators in an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
Fig. 1 schematically illustrates a flowchart of a group control method of a group control system of static var generators in an exemplary embodiment of the present disclosure.
First, in the present exemplary embodiment, there is provided a control method for a group control system of static var generators, the group control system of static var generators including a plurality of groups of static var generators, each group of static var generators including a plurality of static var generators, the control method including: monitoring a plurality of static var generators and acquiring each utilization rate; judging whether the utilization rate reaches a preset utilization rate, using the static var generator with the utilization rate not reaching the preset utilization rate as a supplementary output object, and using the static var generator with the utilization rate reaching the preset utilization rate as a supplementary input object; and controlling the auxiliary output object to compensate the load corresponding to the auxiliary input object according to the dispatching mode of the group control system.
According to the control method for the group control system of the static var generators in the example embodiment, the advantages and the positive effects are that:
the method can acquire the equipment state of each static var generator in real time, and can freely compensate a single static var generator, a single group and a plurality of groups through corresponding dispatching modes. The device has the advantages that the device cannot cause long-term full load and overweight of single equipment, cannot cause low equipment utilization rate and excessive light load and idleness, and can furthest exert the efficiency of each piece of equipment, so that resources are reasonably allocated, the utilization rate of the equipment is effectively improved, and the service life of the equipment is prolonged. On one hand, the compensation range can be enlarged, and the compensation effect is improved; on the other hand, the idle waste of resources is avoided, the utilization rate of the equipment is improved, the service life of the equipment is prolonged, and the maintenance cost is reduced; on the other hand, excessive equipment is avoided, and the investment cost is reduced.
The basic principle of SVG is to connect a VSC (Voltage source converter) in parallel to a power grid via a reactor or a transformer, and control the amplitude and phase of the current at the ac side by adjusting the amplitude and phase of the output Voltage at the ac side of the Voltage source converter, so as to quickly absorb or emit the required reactive power (or harmonic current), thereby achieving the purpose of quickly and dynamically adjusting the reactive power (compensating the harmonic).
The compensation mode that usually adopts is before each consumer that needs to carry out reactive compensation, installs SVG additional, and the reactive compensation power of SVG reactive compensation equipment should be greater than the reactive peak value of production. The method can compensate the reactive power of all high-low voltage lines and power transformers before installation, and has the advantages of large compensation range and good compensation effect. However, this presents certain problems: firstly, too many devices are additionally arranged, and the investment cost is too high; second, reactive power is not always at peak, SVG does not need to run fully for a significant amount of time; thirdly, when the compensated equipment is overhauled or stops working, the SVG reactive power compensation equipment can be cut off and stops running, so that the resource is idle and wasted. According to the current situation, in the production process, the SVG is not always in a full-load running state, and the time change of the load state of each SVG is different. Therefore, when a part of SVGs run lightly, the rest of the force can be used for assisting and supporting other SVGs running fully.
Fig. 3 schematically illustrates a scheduling concept diagram of a group control system of static var generators in an exemplary embodiment of the present disclosure; fig. 4 schematically illustrates a scheduling flowchart of the group control system of the static var generators in an exemplary embodiment of the present disclosure.
Referring to fig. 3, by taking a steel rolling rectifier transformer 203 as an example, a 201 area in the drawing is a power layer, a 202 area is a communication layer, rated capacities of SVG 1-SVG 3 are all 500A, it is detected that a production load L oad1 needs reactive compensation 1200A, but compensation capacity which can be output only by the SVG1 is 500A at present, and a deficiency of 700A exists, at this time, SVG1 informs a host computer (SCADA) system that a required assistance amount is 700A, and an assistance command is issued by operation and analysis of the host computer (SCADA), and SVG2 assists in compensating 500A and SVG3 assists in compensating 200A, so that assistance requirements are met, and group allocation control is realized.
In this example embodiment, according to the field application requirement, multiple SVGs located in the same branch or distribution room on the secondary side may be defined as the same group, or the group may be divided according to the actual requirement or other rules, which is not particularly limited in this example embodiment. The SVG group control system can comprise a plurality of SVG groups, and the group control system is an intelligent group control system for short.
In the present exemplary embodiment, the preset usage rate is an operation usage rate limit set to ensure that each SVG is below full-load operation, and by this limit, it is possible to limit SVG below full-load operation to reduce full-load operation, thereby extending the life of the device. In this embodiment, the preset usage rate limit may be 90%, and the "preset usage rate limit 90%" is referred to as a 90% limit hereinafter. In other embodiments, the preset usage limit may also be 70%, 80%, etc., and the disclosure is not limited herein.
A control method for a group control system of static var generators provided in the present exemplary embodiment will be further described in detail below, and as shown in fig. 4, the method may include:
s1: the group control system can monitor a plurality of SVGs under the group control system in real time through the SCADA system, and can acquire the operation utilization rate of each SVG.
S2: and judging whether the service rate of the SVG is greater than a 90% limit value or not, outputting reactive compensation quantity according to the load requirement when the service rate of the SVG is less than the 90% limit value, and taking the reactive compensation quantity as a supplementary output object.
S3: and judging whether the running utilization rate of the SVG is greater than a 90% limit value or not, and sending out an in-group help request by the insufficient part after the SVG utilization rate is judged to reach the 90% limit value and 90% of the rated capacity is output.
S4: and controlling the help output object to compensate the load corresponding to the help input object according to the dispatching mode of the group control system, wherein the dispatching mode can comprise one or more of local compensation, intra-group help and inter-group help. In other embodiments, the scheduling mode is not limited to this, and may also include a cross compensation mode, and the disclosure is not limited in this respect.
The compensation method in various scheduling modes in the group control system will be described in detail below.
1) For one or more SVGs in the local compensation mode, the SVGs can only serve as supplementary input objects to compensate the corresponding loads of the SVGs, and cannot serve as supplementary output objects to compensate other SVGs. When the usage rate of the SVG is less than the 90% limit value, for example, when the usage rate of the SVG is 50%, the reactive compensation amount can be output according to the load requirement; when the utilization rate reaches the limit value of 90%, after 90% of the rated capacity is output, the insufficient part sends out an intra-group assistance request, and the assistance request capacity R is calculated.
2) When there is an intra-group help request issued due to insufficient compensation of one or more SVGs within a group, an intra-group help mode may be selected first. In other embodiments, the inter-group supplement mode may be entered by directly issuing an inter-group supplement request to override the intra-group supplement request mode.
For a group in an intra-group assistance mode, firstly, the capacity of each assistance output object in the same group, which can be used for compensating the assistance input object, can be calculated to be a first capacity, namely, intra-group scheduling feedback F, wherein the scheduling feedback F is the residual capacity which can be used for group control assistance after local compensation is carried out on SVG in a group control state, namely, the residual partial capacity of the SVG in a rated capacity minus the compensation local load. And secondly, calculating the capacity needing to be compensated of each help input object in the group as a second capacity, namely a help request capacity R, wherein the help request capacity R is the capacity which is insufficient after the rated capacity of the SVG is insufficient to compensate the local load, and the capacity is called as the help request capacity.
Further, it is determined whether a "total scheduled feedback (sumF)" which is a sum of all first capacities in the group, i.e., a sum of scheduled feedbacks F, is greater than a "total helped requested capacity (sumR)" which is a sum of all second capacities in the group, i.e., a sum of helped requested capacities R. Wherein sumF and sumR can be calculated according to the following formula:
sumF＝FSVG1+FSVG2+…+FSVGn
sumR＝RSVG1+RSVG2+…+RSVGn
for example, the scheduling feedback of SVG1 may be 100A or FSVG1The schedule feedback for SVG2 is 200A, F, 100ASVG2The schedule feedback for SVG3 is 300A, F, 200ASVG3300A, sumF 100A +200A +300A 600A.
For example, SVG1 may have a fill request capacity of 50A or RSVG150A, SVG2The fill request capacity is 100A or RSVG2The help request capacity of SVG3 is 150A, R, 100ASVG3150A, sumR 50A +100A +150A 300A.
When the sum of all the first capacities in the group is greater than the sum of all the second capacities in the group, i.e., if sumF > sumR, as in the above example, 600A > sumR > 300A, each of the auxiliary output objects may be controlled to compensate the load compensated by the auxiliary input object according to the first predetermined rule.
Further, the first preset rule may be to compensate the load for assisting the compensation of the input object according to a specific gravity Pct of each first capacity of the current group in the sum of all first capacities of the current group, and output the assisting specific gravity Pct of each SVG. May include adjusting the load compensated to the helper input object according to:
PctSVG1＝FSVG1/sumF＝FSVG1/(FSVG1+FSVG2+…+FSVGn)
QSVG1＝sumR*(FSVG1/sumF)＝sumR*(FSVG1/(FSVG1+FSVG2+…+FSVGn))
wherein Q isSVG1Capacity to compensate for the load compensated by the helper input object.
In other embodiments, the first preset rule may also be defined according to other allocation manners, for example, the first preset rule may be defined in an equal compensation manner, and the disclosure is not limited herein.
When the sum of all the first capacities in the group is judged to be not more than the sum of all the second capacities in the group, namely sumF is not more than sumR, and when the total feedback value in the group is insufficient, the utilization rate of each auxiliary output object is increased to a preset utilization rate, namely 90%, and the sum of all the second capacities in the group after the utilization rate of each auxiliary output object is increased to the preset utilization rate, namely the inter-group auxiliary request capacity R is calculatedGAnd meanwhile, sending out an inter-group help request. For example, sumF-200A may be used<If the sum r is 300A, the utilization rate of each auxiliary output object in the group is increased to 90% which is the preset utilization rate, that is, 200A of the sum f is left after compensating 300A of the help capacity requested in the groupRemaining 100A to be compensated, i.e. inter-group fill-up request capacity RG＝100A。
3) When one or more groups still have insufficient compensation condition after performing the intra-group compensation and issue an inter-group help request, the inter-group help mode can be entered.
For example, the group in the inter-group assistance mode may include a first priority, a second priority, a third priority … nth priority, and the like in order from the highest priority, and in other embodiments, a random detection mode may be selected without the priority being preset, and the disclosure is not limited herein. Starting from the highest priority, the total of all the first capacities of the current priority group is detected, i.e. the scheduling total feedback sumF.
When the dispatch total feedback sumF of the group is detected to be not less than the sum of all the second capacities of the group needing help, namely the inter-group help request capacity RGWhen this is true, for example, sumF may be 200A>RGWhen the priority feedback is 100A, that is, when the current priority feedback is sufficient, the group auxiliary output objects compensate the load compensated by the auxiliary input objects of the group that needs to be assisted according to a first preset rule, similar to the group internal auxiliary manner, the first preset rule may be output distribution according to the SVG output auxiliary specific gravity Pct, or may be defined according to other distribution manners, for example, an equal compensation manner, and the disclosure is not particularly limited herein.
Detecting that the sum sumF of all first capacities of the group under the current priority is smaller than the sum R of all second capacities of the group needing help, namely the inter-group help request capacity RGAnd when the current priority feedback is insufficient, increasing the utilization rate of each auxiliary output object in the group to a preset utilization rate, namely 90%, namely that each SVG in the priority group outputs 90% of the rated capacity, and continuously detecting the group with the next priority as the group with the current priority until the insufficient capacity among the groups can be compensated. For example, sumF-200A may be used<RGWhen the service rate of each help output object in the group is increased to 90% which is the preset service rate, namely 500A of the help capacity requested by 200A compensation group of sumFAfter a, 300A remains to be compensated and continues to detect the next priority group.
Fig. 2 schematically illustrates a simulation block diagram of a group control system of static var generators in an exemplary embodiment of the present disclosure.
The present exemplary embodiment further provides a group control system 10 of static var generators corresponding to the above control method, and as shown in fig. 2 to 4, the group control system 10 may include:
the state monitoring module 101 may be configured to monitor a plurality of static var generators, and obtain a usage rate of each static var generator;
the judging module 102 may be configured to judge whether the usage rate of the static var generator reaches the preset usage rate, and determine a supplementary type of the static var generator according to a judgment result, where the supplementary type includes a supplementary input and a supplementary output; and
the compensation control module 103 may be configured to control the svm as a supplementary output object to compensate a load corresponding to the svm as a supplementary input object according to a scheduling mode of the svm group control system.
Preferably, the determining module 102 may include a first determining unit and a second determining unit. The first judging unit may be configured to, when judging that the usage rate of the static var generator does not reach the preset usage rate, use the static var generator as a help output object; the second determination unit may be configured to determine that the usage rate of the static var generator reaches the preset usage rate, and use the static var generator as a supplementary input object.
The embodiment of the example provides a group control system for static var generators, which can adopt an upper computer (SCADA) system to acquire the state of each SVG reactive compensation device in real time, and then perform group division and group regulation group control. An upper computer (SCADA) system allows the usage limit value of each SVG to be set according to the actual reactive power condition on site, and meanwhile, compensation can be freely carried out on each SVG, the interior of each SVG and between SVG and each SVG through a corresponding scheduling mode. The device has the advantages that the device cannot be fully loaded and overloaded for a long time, the device cannot be used at a low rate and can not be idled due to long-time light load, and the efficiency of each device can be furthest exerted. Therefore, resources are reasonably allocated, the utilization rate of equipment is effectively improved, and the service life of the equipment is prolonged.
The specific details of each module in the group control system of the static var generator have been described in detail in the control method of the corresponding group control system of the static var generator, and therefore are not described herein again.
Moreover, although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (12)
1. A control method for a group control system of static var generators, the group control system of static var generators comprising a plurality of groups of static var generators, each group of static var generators comprising a plurality of static var generators, characterized in that the control method comprises:
monitoring a plurality of static var generators to obtain the utilization rate of each static var generator;
judging whether the utilization rate reaches a preset utilization rate or not, and taking the static var generator as a supplementary output object when judging that the utilization rate of the static var generator does not reach the preset utilization rate;
when the utilization rate of the static var generator is judged to reach the preset utilization rate, the static var generator is used as a supplementary input object; and
controlling the auxiliary output object to compensate the load corresponding to the auxiliary input object according to the dispatching mode of the group control system of the static var generator;
wherein, when the scheduling mode includes an intra-group complementary mode, the controlling the complementary output object to compensate the load corresponding to the complementary input object includes:
calculating the capacity of each auxiliary output object in the same group, which can be used for compensating the auxiliary input object, to be a first capacity;
calculating the capacity of each auxiliary input object in the group, which needs to be compensated, as a second capacity;
judging whether the sum of all first capacities in the group is larger than the sum of all second capacities in the group;
when the first capacity sum of all the auxiliary output objects in the group is judged to be larger than the second capacity sum of all the auxiliary input objects in the group, controlling each auxiliary output object to compensate the load compensated by the auxiliary input object according to a first preset rule; the first preset rule is to compensate the load compensated by the aid input object according to the proportion of each first capacity of the current group to the sum of all the first capacities of the current group;
and when judging that the sum of all the first capacities in the group is not greater than the sum of all the second capacities in the group, increasing the utilization rate of each auxiliary output object to the preset utilization rate, calculating the sum of all the second capacities of the group after increasing the utilization rate of each auxiliary output object to the preset utilization rate, and simultaneously sending an inter-group auxiliary request.
2. The control method of claim 1, wherein the scheduling mode comprises:
one or more of local compensation, the intra-group aid, and the inter-group aid.
3. The control method according to claim 2, wherein in the local compensation mode, the SVG is only used as a helper input object.
4. The control method according to claim 3, wherein in the inter-group complementary mode, the controlling the complementary output object to compensate for the load corresponding to the complementary input object comprises:
detecting all the first capacity sums of the groups of the current priority from the highest priority; when detecting that all the first capacity sums of the group are not smaller than all the second capacity sums of the group, compensating the load compensated by the supplementary input objects of the group by each supplementary output object in the group according to the first preset rule;
when detecting that all the first capacity sums of the groups under the current priority are smaller than all the second capacity sums of the groups, increasing the utilization rate of each supplementary output object in the group to the preset utilization rate and taking the group of the next priority as the group of the current priority.
5. The control method of claim 4, wherein the first predetermined rule comprises adjusting the load compensated for the helper input object according to the following equation:
QSVG1＝sumR*(FSVG1/sumF)＝sumR*(FSVG1/(FSVG1+FSVG2+…+FSVGn))
wherein Q isSVG1Sum R is the sum of all the second capacities of the helper input objects of the group, FSVG1、FSVG2…FSVGnFor each of the first capacities of the current group, sumF is a sum of all the first capacities of the current group.
6. The control method according to any one of claims 1 to 5, wherein the preset usage rate is an operation usage rate that defines that the static var generator is operated below full-load operation.
7. The control method according to any one of claims 1 to 5, wherein monitoring the plurality of static var generators comprises:
and monitoring a plurality of static var generators through a SCADA system.
8. The control method according to any one of claims 4 to 5, characterized by further comprising:
configuring one or more of the first preset rule, the preset usage rate, and the priority of the group in response to an external input.
9. A group control system for static var generators, comprising:
the system comprises a state monitoring module, a state judging module and a state judging module, wherein the state monitoring module is used for monitoring a plurality of static var generators and acquiring the utilization rate of each static var generator;
the judging module is used for judging whether the utilization rate of the static var generator reaches a preset utilization rate or not and determining the assistance type of the static var generator according to a judging result, wherein the assistance type comprises assistance input and assistance output; and
the compensation control module is used for controlling the static var generator serving as a help output object to compensate the load corresponding to the static var generator serving as a help input object according to the dispatching mode of the static var generator group control system;
wherein, when the scheduling mode includes an intra-group assistance mode, the compensation control module is configured to:
calculating the capacity of each auxiliary output object in the same group, which can be used for compensating the auxiliary input object, to be a first capacity;
calculating the capacity of each auxiliary input object in the group, which needs to be compensated, as a second capacity;
judging whether the sum of all first capacities in the group is larger than the sum of all second capacities in the group;
when the first capacity sum of all the auxiliary output objects in the group is judged to be larger than the second capacity sum of all the auxiliary input objects in the group, controlling each auxiliary output object to compensate the load compensated by the auxiliary input object according to a first preset rule; the first preset rule is to compensate the load compensated by the aid input object according to the proportion of each first capacity of the current group to the sum of all the first capacities of the current group;
and when judging that the sum of all the first capacities in the group is not greater than the sum of all the second capacities in the group, increasing the utilization rate of each auxiliary output object to the preset utilization rate, calculating the sum of all the second capacities of the group after increasing the utilization rate of each auxiliary output object to the preset utilization rate, and simultaneously sending an inter-group auxiliary request.
10. The SVG group control system of claim 9, wherein said determining module comprises:
the first judgment unit is used for taking the static var generator as a help output object when judging that the utilization rate of the static var generator does not reach the preset utilization rate;
and the second judgment unit is used for taking the static var generator as a help input object when judging that the utilization rate of the static var generator reaches the preset utilization rate.
11. The SVG cluster control system of claim 9, characterized in that said scheduling mode comprises:
one or more of local compensation, the intra-group aid, and the inter-group aid.
12. The svg system of claim 11, wherein in the local compensation mode, the svg is only used as a helper input object.
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