CN110783933A - Reactive compensation composite system for transformer substation and control method thereof - Google Patents
Reactive compensation composite system for transformer substation and control method thereof Download PDFInfo
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- CN110783933A CN110783933A CN201911221110.XA CN201911221110A CN110783933A CN 110783933 A CN110783933 A CN 110783933A CN 201911221110 A CN201911221110 A CN 201911221110A CN 110783933 A CN110783933 A CN 110783933A
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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 composite system for a transformer substation and a control method thereof. The system comprises a master control end, a first reactive compensation end and a second reactive compensation end, wherein the master control end is used for acquiring the reactive compensation amount to be compensated on a bus of the transformer substation, generating a first control instruction according to the reactive compensation amount to be compensated and sending the first control instruction to the first reactive compensation end and/or generating a second control instruction to the second reactive compensation end. Owing to be provided with two reactive compensation ends, first reactive compensation end wherein is provided with a plurality of reactive compensation units, so, total accuse end can control each reactive compensation unit access circuit or with the circuit disconnection as required, has 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, and second reactive compensation end can finely tune the reactive compensation volume to can guarantee that the generating line of transformer substation is in best running state all the time, and can effectively reduce cost.
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 composite system for a transformer substation and a 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, 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 therefore the centralized compensation technology of the transformer substation needs to be urgently updated so as to meet the requirements of stable operation and efficient equipment maintenance of the reactive compensation device under the new power utilization environment.
Disclosure of Invention
Based on the above situation, the present invention is directed to a reactive compensation composite system for a transformer substation and a control method thereof, 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 composite system for a transformer substation, which comprises a master control end, a first reactive compensation end and a second reactive compensation end, wherein the master control end is used for acquiring a reactive compensation amount to be compensated on a bus of the transformer substation, generating a first control instruction according to the reactive compensation amount to be compensated, and sending the first control instruction to the first reactive compensation end and/or generating a second control instruction to the second reactive compensation end;
the first reactive compensation end performs reactive compensation on a transformer substation in a way of accessing a capacitor, and comprises a unit control module and a plurality of reactive compensation units, wherein the unit control module is used for receiving the first control instruction and controlling one or more access circuits in the plurality of reactive compensation units according to the first control instruction;
the second reactive compensation end comprises an SVG reactive compensation device and comprises an active power filter, a coupling transformer, an inductor and a passive filter, wherein the output end of the active power filter is connected with the primary side of the coupling transformer after passing through the inductor, and the secondary side of the coupling transformer is connected with the passive filter in series and then is connected into a power grid.
Preferably, the first and second electrodes are formed of a metal,
the total 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 a standard value stored in the signal processing module to obtain a reactive compensation amount, generating a first control instruction according to the reactive compensation amount and sending the first control instruction to the first reactive compensation end and/or generating a second control instruction to the second reactive compensation end.
Preferably, each reactive compensation unit includes 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 first control instruction and execute an action of controlling the intelligent switches of the reactive compensation units to be switched on and off according to the first control instruction.
Preferably, at least two of the plurality of reactive compensation units have different compensation amounts.
Preferably, a filter capacitor is disposed between the inductor and the coupling transformer.
A second aspect of the present invention provides a reactive compensation compound control method for a substation, which uses the reactive compensation compound system as described above, and the control method includes:
s100, acquiring the bus voltage of the transformer substation acquired by a bus voltage acquisition module and the bus current of the transformer substation acquired by a bus current acquisition module;
s200, processing the bus voltage and the bus current to obtain a processing result;
s300, comparing the processing result with a preset standard value to obtain a reactive power to-be-compensated quantity;
s400, generating a first control instruction and/or a second control instruction according to the reactive power to be compensated quantity;
s500, sending a first control instruction to the first reactive power compensation end and/or sending a second control instruction to the second reactive power compensation end;
and S600, the first reactive compensation end controls one or more access circuits in the reactive compensation units and/or the second reactive compensation end to perform dynamic reactive compensation according to the first control instruction, and then the step returns to S100.
Preferably, S400 includes:
s410, subtracting a preset standard value from the processing result to obtain a deviation value;
s420, judging whether the deviation amount is positive or negative, and if the deviation amount is positive, entering S430, and if the deviation amount is negative, entering S460;
s430, comparing the reactive compensation amount to be compensated with a preset minimum compensation amount, judging whether the reactive compensation amount to be compensated is smaller than the preset minimum compensation amount, if so, entering S440; otherwise, entering S450;
s440, only generating the second control instruction;
s450, generating the first control instruction or generating the first control instruction and the second control instruction;
and S460, only generating the first control instruction to control one or more of the reactive compensation units in the access circuit to be disconnected with the circuit.
Preferably, the first and second electrodes are formed of a metal,
s450 includes:
s451, searching reactive compensation units which are not connected with a circuit according to the reactive compensation amount to be compensated, judging whether reactive compensation units or reactive compensation unit combinations with compensation amount equal to the reactive compensation amount to be compensated exist, if so, entering S452, otherwise, entering S453;
s452, generating the first control instruction to control the reactive compensation unit or the reactive compensation unit combination access circuit found in the S451;
s453, searching for a reactive compensation unit or a reactive compensation unit combination with a compensation amount smaller than the reactive compensation amount and closest to the reactive compensation amount to be compensated;
and S455, generating the first control instruction to control the reactive compensation unit or the reactive compensation unit combination access circuit found in S453, and then generating the second control instruction to control the second reactive compensation end to perform micro compensation.
Preferably, after S453 and before S455, performing: s454, comparing a difference value obtained by subtracting the compensation amount of the reactive compensation unit or the combination of the reactive compensation units found in S453 with the preset minimum compensation amount, if the difference value is smaller than the preset minimum compensation amount, entering S455, otherwise:
s456, searching for a reactive compensation unit or a reactive compensation unit combination with a compensation amount larger than the reactive compensation amount to be compensated and closest to the reactive compensation amount to be compensated;
and S457, generating the first control instruction to control the reactive compensation unit or the reactive compensation unit combination access circuit searched in the S456.
Preferably, in S460, the reactive compensation unit with the smallest compensation amount among the reactive compensation units accessing to the circuit is disconnected from the circuit.
The reactive compensation composite system for the transformer substation is provided with two reactive compensation ends, wherein the first reactive compensation end is provided with a plurality of reactive compensation units, so that the master control end can control each reactive compensation unit to be connected into a circuit or disconnected from the circuit according to needs, the reactive compensation composite system has the practical advantages of being small in grading, convenient to install, large in available space, convenient to manage and maintain and the like, the second reactive compensation end can be used for finely adjusting reactive compensation quantity, therefore, a bus of the transformer substation can be guaranteed to be always in the optimal running state, and cost can be effectively reduced.
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 compensation complex 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 circuit diagram of the SVG reactive power compensation device provided in the embodiment of the present invention accessing to a power grid;
fig. 4 is a schematic diagram of a process of generating a second control instruction by the main control module according to an embodiment of the present invention;
fig. 5 is a flowchart of a reactive compensation compound control method for a substation 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 first reactive compensation terminal; 201. a reactive compensation unit; 202. a unit control module;
300. a second reactive compensation terminal; 301. an active power filter; 302. a coupling transformer; 303. an inductance; 304. a passive filter; 305. and a filter capacitor.
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 compensation composite system for a transformer substation, as shown in fig. 1, the system includes a master control end 100 and a first reactive compensation end 200, the master control end 100 is configured to obtain a to-be-compensated reactive power amount on a bus of the transformer substation, and generate a first control instruction according to the to-be-compensated reactive power amount to send to the first reactive compensation end 200, the first reactive compensation end 200 performs reactive compensation on the transformer substation in a manner of accessing a capacitor, and includes a unit control module 202 and a plurality of reactive compensation units 201, the unit control module 202 is configured to receive the first control instruction sent by the master control end 100 and control one or more access circuits in the plurality of reactive compensation units 201 according to the first control instruction. Therefore, the master control end 100 can control each reactive compensation unit 201 to be connected into a circuit or disconnected from the circuit as required, and has the characteristics of small classification, convenience in installation, large available space, convenience in management and maintenance and the like. 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.
Because the compensation amount of each reactive compensation unit 201 is certain, no matter how the reactive compensation unit 201 is selected, the reactive compensation amount cannot be completely and accurately met, namely, the reactive compensation amount can be equal to the reactive compensation amount only under certain coincident conditions, most of the conditions cannot be completely equal to the reactive compensation amount, on the basis, the reactive compensation device further comprises a second reactive compensation end 300, the second reactive compensation end 300 comprises an SVG reactive compensation device, as shown in FIG. 3, the SVG reactive compensation device comprises an active power filter 301, a coupling transformer 302, an inductor 303 and a passive filter 304, the output end of the active power filter 301 is connected to the primary side of the coupling transformer 302 through the inductor 303, the secondary side of the coupling transformer 302 is connected to the power grid after being connected in series with the passive filter 304, and the master control end 100 can also generate a second control instruction according to the reactive compensation amount to be sent to the second reactive compensation end 300 to control the SVG reactive compensation device to carry out stepless compensation Reactive compensation, so, the cooperation of first reactive compensation end 200 can guarantee that the generating line of transformer substation is in the best running state all the time. Specifically, referring to fig. 4, the main control module 104 of the head control terminal 100 performs ip-iq operation on the bus current signal and the bus voltage signal, and then performs low-pass filtering and harmonic current detection to generate a PWM control signal, i.e., a second control instruction.
In addition, the SVG reactive power compensation device of the present application is different from a conventional parallel hybrid filter, in which an active power filter 301 is connected in parallel with a small inductor 303 through a coupling transformer 302, then connected in series with a passive filter 304, and then incorporated into a power grid. The passive filter 304 is set to tune to the major harmonic order for eliminating the major harmonic and reactive power compensation. Unlike the conventional parallel hybrid filter in which the active part is controlled to output a harmonic voltage, the active power filter 301 is controlled to output a certain harmonic current component to suppress possible resonance and improve the filter effect. As can be seen from fig. 3, the voltage applied to the active power filter 301 is small due to the additional small inductor 303 connected in parallel to the coupling transformer 302, and the capacity of the active power filter 301 is small because only harmonic current flows. When the active power filter 301 is out of operation due to overload or operation failure, the passive filter 304 can still perform reactive compensation and harmonic compensation together through the additional parallel small inductor 303, and at this time, the system can still operate normally, so that the structure has certain flexibility.
The SVG reactive power compensation device is usually applied to occasions requiring small compensation amount such as railways, and the price is very high to obtain large compensation amount due to high manufacturing cost, so the SVG reactive power compensation device is not applied to reactive power compensation of a power grid at present. And this application combines together SVG reactive power compensator and this kind of multistage compensation arrangement of first reactive compensation end 200, for example utilize first reactive compensation end 200 to carry out the compensation of big compensation volume earlier, and the fine setting is carried out to reuse second reactive compensation volume 300, can enough guarantee that the generating line of transformer substation is in best running state all the time like this, can practice thrift the cost again.
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 to-be-compensated reactive amount, generate a first control instruction according to the to-be-compensated reactive amount, and send the first control instruction to the first reactive compensation terminal 200 and/or generate a second control instruction to the second reactive compensation terminal 300.
Each reactive compensation unit 201 comprises an intelligent switch for controlling the reactive compensation unit 201 to be connected to or disconnected from a circuit, and the unit control module 202 is configured to receive a first control instruction, execute an action of controlling the on/off of the intelligent switches of the reactive compensation units 201 according to the first control instruction, and feed back a signal indicating that the instruction execution is completed to the main control module 104.
Because each reactive compensation unit 201 comprises an intelligent switch, frequent switching requirements can be met, and technical support is provided for fine management of voltage quality of the transformer substation.
The compensation amount of the plurality of reactive compensation units 201 can be equal, so that the reactive compensation units 201 can be used interchangeably, and the control process can be simplified. However, in the actual compensation process, the required compensation amount changes in real time, and the compensation amount combinations obtained by setting all the compensation amounts of the plurality of reactive compensation units 201 to be equal are small, so that it is difficult to satisfy the compensation requirement for real-time change, and therefore, it is preferable that at least two reactive compensation units 201 among the plurality of reactive compensation units 201 have different compensation amounts, for example, the compensation amounts of the plurality of reactive compensation units 201 are different.
Since the SVG reactive power compensation device generates harmonics in actual operation, in order to ensure the reliability of its operation, it is preferable that a filter capacitor 305 is provided between the inductor and the coupling transformer for filtering out the harmonics generated in its own operation, as shown in fig. 3.
Further, the present application also provides a reactive compensation composite control method for a substation, which uses the above reactive compensation composite system, as shown in fig. 5, the control method includes:
s100, acquiring the bus voltage of the transformer substation acquired by a bus voltage acquisition module 101 and the bus current of the transformer substation acquired by a bus current acquisition module 102;
s200, processing the bus voltage and the bus current to obtain a processing result;
s300, comparing the processing result with a preset standard value to obtain a reactive power to-be-compensated quantity;
s400, generating a first control instruction and/or a second control instruction according to the reactive power to be compensated quantity;
s500, sending a first control command to the first reactive power compensation terminal 200 and/or sending a second control command to the second reactive power compensation terminal 300;
and S600, the first reactive power compensation terminal 200 controls one or more access circuits in the reactive power compensation units 201 and/or the second reactive power compensation terminal 300 to perform dynamic reactive power compensation according to the first control instruction, and then returns to S100.
In the present application, a plurality of reactive compensation units 201 are provided at the first reactive compensation end 200, the processing result is compared with a preset standard value to obtain a reactive compensation amount, different reactive compensation strategies are generated according to the magnitude of the reactive compensation amount, and the actual reactive compensation amount closer to the reactive compensation amount is obtained by controlling the on and off of the intelligent switches of each reactive compensation unit 201, on the one hand, the switching control can be continuously adjusted according to actual conditions, closed-loop control is achieved, reactive compensation is more accurate, the voltage stability of a power grid is guaranteed, on the other hand, impact on the power grid due to overlarge primary compensation amount can be effectively avoided, the operation reliability of the power grid is further improved, and the bus of the transformer substation is always in the best operation state by being matched with fine adjustment of the second reactive compensation end 300.
Further preferably, S400 includes:
s410, subtracting a preset standard value from the processing result to obtain a deviation value;
s420, judging whether the deviation amount is positive or negative, and if the deviation amount is positive, entering S430, and if the deviation amount is negative, entering S460;
s430, comparing the reactive compensation amount to be compensated with a preset minimum compensation amount, judging whether the reactive compensation amount to be compensated is smaller than the preset minimum compensation amount, if so, entering S440; otherwise, entering S450;
s440, only generating the second control instruction;
s450, generating the first control instruction or generating the first control instruction and the second control instruction;
and S460, only generating the first control instruction to control one or more of the reactive power compensation units 201 in the access circuit to be disconnected with the circuit. Preferably, the reactive compensation unit 201 with the smallest compensation amount in the reactive compensation units 201 accessing the circuit is disconnected from the circuit.
It can be understood that the deviation amount here is the preset standard value minus the processing result, and may be positive or negative, if the deviation amount is positive, it means that the preset standard value is greater than the processing result, and a switching operation is required, if the deviation amount is negative, it means that the preset standard value is less than the processing result, and a switching operation is required, and in order to better adapt to the power grid, the present application adopts different control processes for the deviation amount being positive and the deviation amount being negative. When the deviation amount is positive, it is first determined whether the reactive compensation requirement can be satisfied only by the second reactive compensation terminal 300, if so, only a second control command is generated to control the second reactive compensation terminal 300 to perform compensation, and if the reactive compensation requirement cannot be satisfied only by the second reactive compensation terminal 300, the reactive compensation is performed together with the first reactive compensation terminal 200.
For example, in one embodiment,
s450 includes:
s451, searching a reactive compensation unit 201 which is not connected with a circuit according to the reactive compensation amount to be compensated, judging whether a reactive compensation unit 201 or a reactive compensation unit combination with the compensation amount equal to the reactive compensation amount to be compensated exists, if yes, entering S452, and if not, entering S453;
s452, generating the first control instruction to control the access circuit of the reactive compensation unit 201 or the reactive compensation unit combination found in the S451;
s453, searching for the reactive compensation unit 201 or the reactive compensation unit combination with the compensation amount smaller than the reactive compensation amount and closest to the reactive compensation amount to be compensated;
s455, generating the first control instruction to control the access circuit of the reactive compensation unit 201 or the reactive compensation unit combination found in S453, and then generating the second control instruction to control the second reactive compensation terminal 300 to perform the micro-compensation.
In the above control method, if the compensation amount of the reactive compensation unit 201 or the reactive compensation unit combination found in S453 is greatly different from the reactive compensation amount to be compensated, at this time, the reactive compensation requirement may still not be completely met by using the second reactive compensation terminal 300, and based on this, it is further preferable that S450 includes:
s451, searching a reactive compensation unit 201 which is not connected with a circuit according to the reactive compensation amount to be compensated, judging whether a reactive compensation unit 201 or a reactive compensation unit combination with the compensation amount equal to the reactive compensation amount to be compensated exists, if yes, entering S452, and if not, entering S453;
s452, generating the first control instruction to control the access circuit of the reactive compensation unit 201 or the reactive compensation unit combination found in the S451;
s453, searching for the reactive compensation unit 201 or the reactive compensation unit combination with the compensation amount smaller than the reactive compensation amount and closest to the reactive compensation amount to be compensated;
s454, comparing a difference value obtained by subtracting the reactive compensation amount to be compensated from the compensation amount of the reactive compensation unit 201 or the reactive compensation unit combination found in S453 with the preset minimum compensation amount, if the difference value is smaller than the preset minimum compensation amount, entering S455, otherwise, executing S456;
s455, generating the first control instruction to control the access circuit of the reactive compensation unit 201 or the reactive compensation unit combination found in S453, and then generating the second control instruction to control the second reactive compensation terminal 300 to perform micro compensation;
s456, searching for the reactive compensation unit 201 or the reactive compensation unit combination with the compensation amount larger than the reactive compensation amount to be compensated and closest to the reactive compensation amount to be compensated;
and S457, generating the first control instruction to control the reactive compensation unit 201 or the reactive compensation unit combination access circuit searched in the S456.
Thus, although the actual compensation amount exceeds the amount of the reactive compensation to be performed, the actual compensation amount is relatively close to the amount of the reactive compensation to be performed, and thus, no excessive influence is generated.
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 (10)
1. A reactive compensation composite system for a transformer substation is characterized by comprising a master control end, a first reactive compensation end and a second reactive compensation end, wherein the master control end is used for obtaining a reactive compensation amount to be compensated on a bus of the transformer substation, generating a first control instruction according to the reactive compensation amount to be compensated, and sending the first control instruction to the first reactive compensation end and/or generating a second control instruction to the second reactive compensation end;
the first reactive compensation end performs reactive compensation on a transformer substation in a way of accessing a capacitor, and comprises a unit control module and a plurality of reactive compensation units, wherein the unit control module is used for receiving the first control instruction and controlling one or more access circuits in the plurality of reactive compensation units according to the first control instruction;
the second reactive compensation end includes SVG reactive power compensator, SVG reactive power compensator includes active power filter, coupling transformer, inductance and passive filter, active power filter's output warp connect behind the inductance coupling transformer's primary side, coupling transformer's secondary with in the passive filter inserts the electric wire netting after establishing ties.
2. The reactive compensation complex system for substation of claim 1,
the total 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 a standard value stored in the signal processing module to obtain a reactive compensation amount, generating a first control instruction according to the reactive compensation amount and sending the first control instruction to the first reactive compensation end and/or generating a second control instruction to the second reactive compensation end.
3. The reactive compensation composite system for a substation according to claim 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, and the unit control module is configured to receive the first control instruction and execute an action of controlling the intelligent switches of the plurality of reactive compensation units to be opened and closed according to the first control instruction.
4. The reactive compensation complex system for a substation of any one of claims 1 to 3, wherein at least two of the plurality of reactive compensation units have different compensation amounts.
5. The reactive compensation composite system for a substation according to any one of claims 1 to 3, characterized in that a filter capacitance is provided between the inductance and the coupling transformer.
6. A reactive compensation compound control method for a substation, characterized in that the reactive compensation compound system of any one of claims 1 to 5 is adopted, and the control method comprises:
s100, acquiring the bus voltage of the transformer substation acquired by a bus voltage acquisition module and the bus current of the transformer substation acquired by a bus current acquisition module;
s200, processing the bus voltage and the bus current to obtain a processing result;
s300, comparing the processing result with a preset standard value to obtain a reactive power to-be-compensated quantity;
s400, generating a first control instruction and/or a second control instruction according to the reactive power to be compensated quantity;
s500, sending a first control instruction to the first reactive power compensation end and/or sending a second control instruction to the second reactive power compensation end;
and S600, the first reactive compensation end controls one or more access circuits in the reactive compensation units and/or the second reactive compensation end to perform dynamic reactive compensation according to the first control instruction, and then the step returns to S100.
7. The reactive compensation compound control method for the substation of claim 6, wherein S400 comprises:
s410, subtracting a preset standard value from the processing result to obtain a deviation value;
s420, judging whether the deviation amount is positive or negative, and if the deviation amount is positive, entering S430, and if the deviation amount is negative, entering S460;
s430, comparing the reactive compensation amount to be compensated with a preset minimum compensation amount, judging whether the reactive compensation amount to be compensated is smaller than the preset minimum compensation amount, if so, entering S440; otherwise, entering S450;
s440, only generating the second control instruction;
s450, generating the first control instruction or generating the first control instruction and the second control instruction;
and S460, only generating the first control instruction to control one or more of the reactive compensation units in the access circuit to be disconnected with the circuit.
8. The reactive compensation compound control method for a substation according to claim 7,
s450 includes:
s451, searching reactive compensation units which are not connected with a circuit according to the reactive compensation amount to be compensated, judging whether reactive compensation units or reactive compensation unit combinations with compensation amount equal to the reactive compensation amount to be compensated exist, if so, entering S452, otherwise, entering S453;
s452, generating the first control instruction to control the reactive compensation unit or the reactive compensation unit combination access circuit found in the S451;
s453, searching for a reactive compensation unit or a reactive compensation unit combination with a compensation amount smaller than the reactive compensation amount and closest to the reactive compensation amount to be compensated;
and S455, generating the first control instruction to control the reactive compensation unit or the reactive compensation unit combination access circuit found in S453, and then generating the second control instruction to control the second reactive compensation end to perform micro compensation.
9. The reactive compensation compound control method for a substation according to claim 8, characterized in that after S453 and before S455: s454, comparing a difference value obtained by subtracting the compensation amount of the reactive compensation unit or the combination of the reactive compensation units found in S453 with the preset minimum compensation amount, if the difference value is smaller than the preset minimum compensation amount, entering S455, otherwise:
s456, searching for a reactive compensation unit or a reactive compensation unit combination with a compensation amount larger than the reactive compensation amount to be compensated and closest to the reactive compensation amount to be compensated;
and S457, generating the first control instruction to control the reactive compensation unit or the reactive compensation unit combination access circuit searched in the S456.
10. The reactive compensation compound control method for the substation according to claim 7, wherein in S460, the reactive compensation unit with the smallest compensation amount among the reactive compensation units accessing to the circuit is disconnected from the circuit.
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| CN115051379A (en) * | 2022-08-17 | 2022-09-13 | 山东国信电力科技有限公司 | Reactive compensation system and compensation method for power distribution network |
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| CN202737471U (en) * | 2012-07-26 | 2013-02-13 | 中国西电电气股份有限公司 | Network compound electric energy quality adjusting device |
| CN203690930U (en) * | 2013-12-19 | 2014-07-02 | 河北工业大学 | Hybrid reactive compensation control system |
| CN204333959U (en) * | 2014-12-26 | 2015-05-13 | 灵宝金源朝辉铜业有限公司 | A kind of novel dynamic TSC+SVG mixing reactive power compensator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202737471U (en) * | 2012-07-26 | 2013-02-13 | 中国西电电气股份有限公司 | Network compound electric energy quality adjusting device |
| CN203690930U (en) * | 2013-12-19 | 2014-07-02 | 河北工业大学 | Hybrid reactive compensation control system |
| CN204333959U (en) * | 2014-12-26 | 2015-05-13 | 灵宝金源朝辉铜业有限公司 | A kind of novel dynamic TSC+SVG mixing reactive power compensator |
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| CN115051379A (en) * | 2022-08-17 | 2022-09-13 | 山东国信电力科技有限公司 | Reactive compensation system and compensation method for power distribution network |
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Effective date of registration: 20220506 Address after: No.27, junqian street, Changzhou City, Jiangsu Province, 213000 Patentee after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. CHANGZHOU POWER SUPPLY BRANCH Patentee after: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. CHANGZHOU JINTAN DISTRICT POWER SUPPLY BRANCH Patentee after: STATE GRID CORPORATION OF CHINA Patentee after: Changzhou Jintan Jinneng Power Co.,Ltd. Address before: No.27, junqian street, Changzhou City, Jiangsu Province, 213000 Patentee before: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. CHANGZHOU POWER SUPPLY BRANCH Patentee before: STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. CHANGZHOU JINTAN DISTRICT POWER SUPPLY BRANCH Patentee before: STATE GRID CORPORATION OF CHINA |