CN104578110A - Reactive compensation control method for distributed reactive compensation system - Google Patents
Reactive compensation control method for distributed reactive compensation system Download PDFInfo
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- CN104578110A CN104578110A CN201510021036.2A CN201510021036A CN104578110A CN 104578110 A CN104578110 A CN 104578110A CN 201510021036 A CN201510021036 A CN 201510021036A CN 104578110 A CN104578110 A CN 104578110A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a reactive compensation control method for a distributed reactive compensation system. The distributed reactive compensation system comprises a plurality of compensation modules connected on the basis of a bus, a master module and slave modules are determined by means of communication delays of the compensation modules in the distributed reactive compensation system, and a reactive compensation network is established; the reactive compensation network is controlled by the master module to conduct reactive compensation on a power grid, and if the master module breaks down in the compensation process, the master module and the slave modules are determined again in the compensation modules according to communication delays, and the reactive compensation network is established again. According to the reactive compensation control method, one master module is adopted for driving the slave modules, reactive power compensation is conducted under the control of the master module, the master module and the slave modules can be determined automatically, and the reactive compensation network is established; when the master module breaks down, the master module and the slave modules are determined again, the reactive compensation network is established again, and the reliability of the system is greatly improved.
Description
Technical field
The invention belongs to reactive power compensation technology field, be specifically related to a kind of power-less compensation control method of distributed reactive power compensation system.
Background technology
Along with China's industrial expansion, the access electrical network that the nonlinear load of the Large Copacity such as the rolling mill in iron and steel, metallurgy, chemical industry, arc furnace, impact is a large amount of, create a large amount of harmonic currents, reactive power, bring extra burden to electrical network, serious negative effect is caused to the operation stability of electric power system and dynamic property.
For the improvement of reactive power in electrical network, rational solution should be needing load place of consume reactive power to produce reactive power, the i.e. local compensation of reactive power.The whole nation is for electricity consumption rule predetermining: var answers in-situ balancing, and the user not reaching power factor command will be imposed a fine it by power supply department.
Therefore, for easy for installation, that the construction period is short, cost is low, operation maintenance is easy distributed reactive power in-situ compensation device, research one can dynamic compensation, take into account three-phase total compensation and three points of benefits, be easy to module dilatation, the power-less compensation control method of stable and reliable operation, to stable operation and the power consumer of network system, is all of great significance.
The demand of the on-the-spot reactive power compensation capacity of user is uncertain, and the compensation capacity of single reactive compensation module is limited.For satisfied convenient application demand, the dynamic compensation reactive power expanding compensation capacity, on the basis of Design of Reactive Power Compensator complete above, based on communication interface existing in controller, the scheme of co-ordination during design multimode networking operation, compensating power, research comprises the distributed intelligence type reactive compensation system of multiple module, realizes the connected network communication of multiple intermodule, co-ordination to expand reactive compensation capacity.
Some reactive power compensation application scenario needs the needs taking into account local compensation and centralized compensation, considers the reactive power equilibrium of whole distribution system, requires suitably to cross during some load local compensation to mend.Obviously, the working method that local compensation runs compensating power automatically can not meet this requirement.This poses the functional requirement of the compensation capacity by each local compensation point of PC control, i.e. remote control operation mode.
In addition, also require in power distribution network that each local compensation point uploads reactive compensation system ruuning situation, power quality parameter, namely realize remote measurement function.
At present, most of reactive-load compensation capacitor great majority are worked by single group capacitor or a control cincture multiple unit capacitor, carry out reactive power compensation, but single group capacitor reasonably cannot compensate according to on-the-spot acrobatic skill change, easily occurred the situation of mending or owing to mend, and the structure wiring of a controller band multiple unit capacitor is complicated, and once control generation problem, system can not work, and cause electric network reactive-load excessive, and even in electrical network, other devices cannot normally work.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of power-less compensation control method of distributed reactive power compensation system.
A kind of power-less compensation control method of distributed reactive power compensation system, described distributed reactive power compensation system comprises several compensating modules connected based on bus, utilize compensating module in distributed reactive power compensation system communication delay determination primary module and from module, and build reactive power compensation network; Reactive power compensation network described in primary module controls carries out reactive power compensation to electrical network, and if in compensation process primary module break down, then from described compensating module, again determine primary module according to communication delay and from module, and rebuild reactive power compensation network.
Power-less compensation control method of the present invention adopts the multiple control method from module of a primary module band, control by there being primary module to carry out reactive power compensation, system can determine primary module and automatically from module, and set up reactive power compensation network, and when primary module breaks down, redefine primary module and from module, rebuild reactive power compensation network, substantially increase the reliability of system.
In distributed reactive power compensation system, each compensating module is provided with corresponding mailing address, and the communication path time delay of the compensating module at different communication address place is different, determines primary module by the following method and from module in the present invention:
Determine primary module by the following method and from module:
After electrification reset, each compensating module all sends primary module confirmation order to other compensating modules, if the primary module that current compensating module receives from other compensating modules in time delay process confirms order, then think that current compensating module is from module, otherwise, think that current compensating module is primary module.
For any compensating module, its time delay process refers to that this compensating module arrives from power on and sends to other compensating modules the waiting process that primary module confirms order.
By communication delay determination primary module with from module in the present invention, so can ensure that the primary module determining to obtain is with minimum from the communication delay of module, substantially increases the ageing of communication, ensures the real-time of reactive power compensation.
Because primary module is with minimum from the communication delay compensated, primary module is therefore adopted initiatively to carry out faults itself detection, can Timeliness coverage fault.
Primary module proceeds as follows when building reactive power compensation network:
First verify each validity from module, and inquire about self according to the polling cycle timing preset and each is effectively from the module information of module, according to Query Result by self be effectively constructed as reactive power compensation network from module;
Described module information comprises the operating state of the compensation capacity of this compensating module, working method and each building-out capacitor.
Wherein, each validity from module is verified by the following method:
Primary module successively to each from module sends Query Information according to each from the mailing address of module according to the polling cycle of presetting, for any one from module: if n polling cycle does not receive this information-reply returned from module continuously, then think that this is invalid from module, and inquire about next mailing address from module send Query Information; If receive the information-reply that this returns from module, then the return information received verifies: if verify unsuccessfully, then think that this is invalid from module; Otherwise, think that this is effective from module, and inquire about next mailing address send Query Information from module.As preferably, the value of described n is 2 ~ 5.
In reactive power compensation process, confirm that primary module breaks down by the following method:
Primary module sends the confirmation that normally works of primary module according to the timing of described compensation cycle to each from module, if all from module all not receiving the confirmation of normal work of autonomous module, then think that described primary module breaks down.
In reactive power compensation process, primary module is according to after the described compensation cycle timing confirmation that transmission primary module normally works to each from module, for any one from module, if primary module does not receive this return information from module, then think that this breaks down from module, this is removed reactive power compensation network from module by primary module from reactive power compensation network.
Reactive power compensation network described in primary module is controlled by following operation carries out reactive power compensation to electrical network:
(S1) primary module calculates reactive power and the power factor of each phase respectively according to the phase voltage of each phase of electrical network and phase current according to the compensation cycle preset;
(S2) according to described reactive power and power factor, and in described reactive power compensation network, the module information of each compensating module forms switching instruction, and sends to corresponding compensating module to control the switching of building-out capacitor in this compensating module.
Switching instruction is formed based on following principle in described step (S2):
A () does not allow overcompensation, allow suitable undercompensation;
B () is all owed the added time when electrical network three-phase and is preferentially dropped into three-phase total compensation and repay building-out capacitor in module, spend the added time and preferentially excise building-out capacitor in phase splitting compensation module;
C, during () switching, the building-out capacitor first dropped into first excises, excise after the building-out capacitor of rear input;
Only change the switching state of building-out capacitor in a compensating module during (d) each switching, when can prevent a large amount of building-out capacitor from dropping into electrical network simultaneously or excising from electrical network, cause electrical network to impact.
Actual conditions according to the reactive power compensation network of composition form switching instruction, when in all under-compensated situation of three-phase, and there is the three-phase total compensation do not dropped in reactive power compensation network when repaying module, judge whether that there is the three-phase total compensation meeting (a) repays module, if meet, then repay selection capacity module from the three-phase total compensation meeting (a) maximum, and the building-out capacitor this three-phase total compensation being repaid each phase in module is all put in electrical network; If the three-phase total compensation not existing for input or satisfied (a) repays module, then for each phase, for the phase that under-compensated capacity is maximum, the basis meeting (a) not being dropped into from the building-out capacitor of corresponding phase the phase splitting compensation module of electrical network selects compensation capacity in this phase maximum, and the building-out capacitor in this phase is dropped into electrical network.
Do not make specified otherwise, the polling cycle described in the present invention and compensation cycle are all according to practical situations setting, and polling cycle is less than compensation cycle usually.
The power-less compensation control method of distributed reactive power compensation system of the present invention adopts the multiple control method from module of a primary module band, control by there being primary module to carry out reactive power compensation, system can determine primary module and automatically from module, and set up reactive power compensation network, and when primary module breaks down, redefine primary module and from module, rebuild reactive power compensation network, substantially increase the reliability of system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the distributed reactive power compensation system of the present embodiment;
Fig. 2 is the structural representation of the compensating module of the present embodiment;
Fig. 3 determines effectively from the method for module in the present embodiment;
Fig. 4 is the communication sequential chart of primary module in a compensation cycle T of the present embodiment;
Fig. 5 is the schematic diagram of the reactive power compensation strategy of the present embodiment;
Fig. 6 is the reactive power compensation experimental system of the present embodiment.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the drawings and the specific embodiments, the inventive method is described in detail.
The reactive power compensation of the present embodiment realizes based on distributed reactive power compensation system as shown in Figure 1, and this distributed reactive power compensation system, by mains supply, comprising:
Upper computer control module (i.e. Industrial PC Computer), for carrying out remote monitoring to reactive compensation module;
Power network current sampling module, for gathering the phase current of electrical network;
Usual power network current sampling module also needs the phase current collected to carry out being converted into small voltage signal, the phase current signal enabling it export is not directly by single-chip microcomputer process (what namely can be understood as the output of power network current sampling module is phase current itself, but carries the small voltage signal of phase current message).
In the present embodiment, current sample module comprises net side CT (being namely positioned at the current transformer of electrical network side) and secondary CT, power network current after net side CT at secondary CT and on sample resistance coating-forming voltage signal, each compensating module sampling of system according to this voltage signal as bus current information (i.e. electrical network phase current information).
Power network current sampling module is directly connected with electrical network, and as shown in Figure 1, form electric current electrical network with certain load.
N number of reactive compensation module (in the present embodiment N=32), comprise three-phase total compensation and repay module (namely working method is three-phase total compensation) and phase splitting compensation module (namely working method is phase splitting compensation), wherein three-phase total compensation repays module three building-out capacitors, the compensation capacity of the building-out capacitor of each phase is identical, and three-phase can only compensate (namely the switching state of three building-out capacitors is identical) simultaneously; Phase splitting compensation module has three building-out capacitors, and the compensation capacity of the building-out capacitor of each phase can identical or different (usually identical), and three-phase can separate compensation (namely the switching state of three building-out capacitors can be different).
Form distributed compensation system by the networking of RS485 bus between 32 each compensating modules, in this distributed compensation system, each reactive power compensation subsystem configures has unique connected network communication address.Compensate demand according to user and choose different capabilities, the module of different compensation way (three-phase total compensation or phase splitting compensation), to meet capacity, the demand that compatible three-phase imbalance compensates.
And to be controlled Long-distance Control and the remote monitoring function of distributed reactive power compensation system works by communication instruction for realizing host computer, each reactive power compensation subsystem adopts RS485 to turn ethernet interface, in conjunction with the design of communication protocol and Content of Communication, realize the communication of host computer and reactive compensation system.
As shown in Figure 2, each reactive compensation module comprises mutually for each in electrical network:
Building-out capacitor, carries out reactive power compensation when dropping into electrical network to electrical network;
The capacitance temperature acquisition module corresponding with building-out capacitor and capacitance current sampling module, wherein capacitance temperature acquisition module is for gathering the temperature signal of corresponding building-out capacitor, and capacitance current sampling module is used for the current signal of acquisition stream through building-out capacitor;
Line voltage sampling module, for gathering the phase voltage signal of each phase in electrical network, the voltage transformer usually arranged in compensating module for gathering line voltage realizes.
Control circuit, for receiving phase current signal and the phase voltage signal of electrical network, and the capacitance current signal of building-out capacitor and capacitance temperature signal, the reactive power of calculating electrical network and power factor to form switching instruction, and export corresponding switch controlling signal according to the module information (comprising the current operating state of the compensation capacity of this compensating module, working method and each building-out capacitor) of the switching instruction formed and self (compensating module that namely this control circuit is corresponding);
The power-less compensation control method that the Chinese patent application that the switch controlling signal exported in the present embodiment is 103972902A according to publication number provides realizes.
Composite switch module, for according to the switching state of current signal and voltage signal control and compensation electric capacity to carry out reactive power compensation.Utilize zero cross fired chip to carry out operating passing zero, zero cross fired chip carries out switching at next zero crossing after receiving switching control signal.
In the present embodiment combination switch by two anti-and thyristor and a magnetic latching relay form, the switching signal provided by control circuit controls the switching of combination switch, combination switch combines the operating passing zero advantage of thyristor and magnetic latching relay is stablized, the advantage that current capacity is strong: set out at voltage zero-cross moment thyristor when dropping into, again by magnetic latching relay adhesive conducting after stable, first magnetic latching relay is disconnected during excision, thyristor time delay disconnects to during current over-zero, realizes the operating passing zero of reactive-load compensation capacitor.
In the present embodiment distributed reactive power compensation system, each compensating module all arranges control circuit, makes each compensating module have the function of complete power system reactive power analysis.
Sampling module is connected to electrical network, and (i.e. three phase network is load supplying, and every phase voltage is u
g, and be provided with inductance L
s).
The phase current signal bus mode that in the present embodiment, power network current sampling module collects transfers to each compensating module.
Consider that compatible three-phase imbalance compensates demand, detection have three-phase current, add and need six roots of sensation order wire altogether by A, B order wire that RS485 communicates, so time select 8 core netting twines, and it is interconnected to adopt RJ11 interface can simply realize multimode, and easy-to-connect.
The power-less compensation control method of the distributed reactive power compensation system of the present embodiment is as follows, determines from described compensating module, determine primary module and from module after distributed reactive power compensation system power-on reset according to communication delay, and builds reactive power compensation network; Reactive power compensation network described in primary module controls carries out reactive power compensation to electrical network, and if in compensation process primary module break down, then from described compensating module, again determine primary module according to communication delay and from module, and rebuild reactive power compensation network.
This power-less compensation control method comprises the steps:
Step 1: based on communication delay determination primary module with from module;
Under all trouble-free condition of all compensating modules, first determine connected network communication address minimum automatically become primary module, all the other compensating modules become from module, and principle is as follows:
After system energization, all compensating modules unify electrification reset, and each compensating module sends primary module to other compensating modules because self connected network communication address is different after time delay different time and confirms order.
If the primary module that current compensating module receives from other compensating modules in time delay process confirms order, then think that current compensating module becomes from module, and no longer send confirmation order, if the primary module confiscating other compensating modules in time delay process confirms order, then current compensating module becomes primary module and sends confirmation order to other compensating modules.
Step 2: primary module proceeds as follows and builds reactive power compensation network:
(2-1) determine effectively from module, specifically as shown in Figure 3:
Send Query Information to each mailing address successively according to the polling cycle of presetting, and determine according to the return information of this mailing address:
Primary module successively to each from module sends Query Information according to each from the mailing address of module according to described polling cycle (in the present embodiment, polling cycle is 25ms), for any one from module (communication landlord j): if continuous 2 polling cycles do not receive this information-reply returned from module (Frame), then think the compensating module that do not configure this mailing address in bucking-out system or should break down and cannot communicate from module, namely should be invalid from module, and inquire about next mailing address from module send Query Information (namely to next mailing address from module send Query Information), if receive the information-reply that this returns from module, the return information then received carries out verifying (being CRC check in the present embodiment): if verify unsuccessfully, then think that this is invalid from module, and inquire about next mailing address from module send Query Information, otherwise, think that this is effective from module, and inquire about next mailing address send Query Information, until stop during j=N from module.
(2-2) inquire about each effectively from the current operating state (whether dropping into electrical network) of the compensation capacity of module, working method (three-phase total compensation or phase splitting compensation), compensation condenser, complete networking process and obtain reactive power compensation network.
(2-3) primary module is according to the phase voltage of each phase in electrical network, bus current (i.e. the phase current of this phase) calculate reactive power and the power factor of each phase in three-phase respectively.
(2-4) according to the module information formation switching instruction of Arithmetic for Reactive Power Compensation in conjunction with compensating modules all in reactive power compensation network, and send to corresponding compensating module to control the switching state of building-out capacitor in corresponding compensation, to coordinate distributed reactive power compensation network, reactive power compensation is carried out to electrical network.
In compensation process, primary module also proceeds as follows:
According to compensating timing to the confirmation normally worked from module transmission primary module, with fault message, the operating state (namely this compensating module, whether each building-out capacitor drops into electrical network) of determining primary module and inquire about from module.
In compensation process, operation below performing from module:
After receiving the confirmation of primary module, return corresponding return information to primary module; Receive the switching action command that primary module sends, according to order and in conjunction with the switching of capacitor in current self-operating status control module.
For any one from module, if primary module does not receive this return information from module, then think that this breaks down from module, this is removed reactive power compensation network from module by primary module from reactive power compensation network.
If all from module all not receiving the confirmation of normal work of autonomous module, then think that described primary module breaks down, from effectively redefining primary module from module and from module.
In the power-less compensation control method of the present embodiment, compensating module is divided into primary module and from module, wherein primary module quantity is 1, namely adopt a primary module band many from module work pattern, the each compensating module of this structure all has the function that complete power system reactive power is analyzed, if therefore primary module breaks down out of service, a new primary module can formed from module, maintain the normal operation of system.
In present system communication, comprise primary module with from the communication of module, primary module is by the communication of communication interface with host computer, therefore primary module is host node, and the communication process of coordination whole system, prevents bus contention situation.
Prevent command collision by design communication sequential in the present embodiment, Figure 4 shows that the communication sequential of primary module in a compensation cycle T (in the present embodiment, compensation cycle T is 5s):
In first time period (namely in the t1 time), primary module sends switching instruction to from module and self,
In second time period in the t2 time, primary module performs switching instruction, receives switching order and perform from module,
In 3rd time period (namely the t3 time is interior), complete the process that primary module communicates with host computer, the voltage that in this process, primary module runs to host computer reporting system, all module running statuses, fault message in power factor and system;
In 4th time period (namely in the t4 time), the switching command execution situation of primary module inquiry from module and the fault message from module.
Determination reactive power compensation strategy based on power factor, reactive power and system voltage in intelligent networking reactive-load compensation method in the present embodiment, and compatible three-phase total compensation repays module and phase splitting compensation module.
Following compensation principle is followed when forming compensating instruction:
A. do not allow overcompensation, allow suitable undercompensation;
B. three-phase all owes the added time, never drop in select compensation capacity maximum and can not exceed needs compensation the current input compensation electric capacity of reactive compensation power, drop into first group that can run, that capacity is maximum and the common benefit capacitor of any phase generation overcompensation can not be made, if the maximum Capacitor banks of capacity drops into, then drop into second largest Capacitor banks of capacity, by that analogy.If any one group all can be greater than deficient benefit capacity for the common benefit capacitor dropped into or dropped into, then ABC three-phase is divided to carry out a point benefit;
C. each idle judgement only changes the switching state that a group is mended capacitor altogether, or more than change the every component mutually of ABC three-phase simultaneously and mend the switching state of capacitor, prevent a large amount of capacitor simultaneously switching cause larger impact, each switching state carries out idle detection and judgement next time after changing, and carries out the switching action of a new round;
D. owe the added time to pay the utmost attention to and can drop into common benefit capacitor, then analyze and can drop into a point benefit capacitor, and spend the added time and pay the utmost attention to and can excise certain point benefit capacitor mutually, then can analysis excise common benefit capacitor;
E. during system switching, the capacitor first dropped into first excises, and excises after the capacitor of rear input.
If in system, three-phase total compensation is repaid in module three kinds of compensation capacity M1 (20kVar) >M2 (15kVar) >M3 (10kVar), two kinds of phase splitting compensation modules, capacity is m1 (10kVar) >m2 (5kVar).Reactive power compensation strategic process figure, as Fig. 5, comprises the steps:
If S1. three-phase is owed benefit capacity and is all greater than M1 (20kVar), and the submodule that compensation capacity is M1 can drop into (state that namely now drops into is not for dropping into electrical network), then drop into the common benefit electric capacity (namely three-phase total compensation repays the building-out capacitor in module) that one group of compensation capacity is M1, otherwise enter step S2;
If S2. three-phase undercompensation capacity is all greater than M2 (15kVar) (but not all be all less than M1 mutually), and the submodule that compensation capacity is M2 can drop into, then drop into the common benefit electric capacity that one group of compensation capacity is M2, otherwise enter step S3;
If S3. three-phase undercompensation capacity is all greater than M3 (10kVar) (but not all be all less than M2 mutually), and the submodule that compensation capacity is M3 can drop into, then drop into the common benefit electric capacity that one group of compensation capacity is M4, otherwise enter step S4;
If S4. there is a phase (phase that undercompensation capacity is maximum) undercompensation capacity to be greater than m1 (10kVar) in three-phase, and to should phase compensation capacity be that the submodule of m1 can drop into, then drop into point benefit electric capacity that a compensation capacity is m1, otherwise enter step S 5;
If S5. there is a phase (phase that undercompensation capacity is maximum) undercompensation capacity to be greater than m2 (5kVar) in three-phase, and to should phase compensation capacity be that the submodule of m1 can drop into, then drop into point benefit electric capacity (building-out capacitor namely in phase splitting compensation module) that a compensation capacity is m2, otherwise do not carry out switching action.
For network-building method and the real work effect of intelligent networking distributed reactive power compensation system of the present invention are better described, devise the experimental system of wiring as Fig. 6 and verify.
As shown in Figure 6, resistance sense load is connected to voltage regulator secondary, and distributed reactive power compensation system is connected to the former limit of voltage regulator and detects the electric current (i of voltage regulator lambda line
s).Regulate the output voltage values of voltage regulator secondary to get final product dynamic adjustments lagging reactive power, simulate the reactive power load of dynamic change with this.Voltage regulator output voltage slowly regulates from low to high.Intelligent networking distributed reactive power compensation system is made up of the shunt capacitor of four groups of 20KVar, and price modification voltage regulator secondary voltage, obtains different replenishment strategy and supplementary result, specifically as shown in table 1.
Table 1
The on-the-spot bus of the industrialization of reality is assembled with intelligent networking distributed reactive power compensation system, system comprises 2 groups of 20kVar complementary modulus block (namely three-phase total compensation repays module) altogether, the module that 4 groups of 5kVar mend altogether, 4 groups of 5kVar divide complementary modulus block (phase splitting compensation module), system can steady in a long-termly be run, after compensating, power factor maintains more than 0.9, condition of repaying a kindness does not occur, the good reactive power compensation effect of the system that shows.
The ruuning situation of the distributed reactive power compensation system run by experiment and industry spot is seen, the power-less compensation control method of the present embodiment distributed reactive power compensation system has the following advantages:
A () meets the convenient demand expanding compensation capacity in user scene, expand system balance capacity only to need increase submodule quantity and re-power, system can be run by automatic re-networking, wiring is simple, and when primary module breaks down, regenerate new primary module and ensure that system continues normal work;
B () adopts the reactive power compensation strategy considering reactive power and power factor, compatible three-phase total compensation repays module and phase splitting compensation module, the compensation to three-phase imbalance load can be realized, allow the access of the module of multiple compensation capacity, improve reactive power compensation precision;
C () adds and communicates with host computer, remote control box, remote measurement function by real-time performance.
Above-described embodiment has been described in detail technical scheme of the present invention and beneficial effect; be understood that and the foregoing is only most preferred embodiment of the present invention; be not limited to the present invention; all make in spirit of the present invention any amendment, supplement and equivalent to replace, all should be included within protection scope of the present invention.
Claims (9)
1. the power-less compensation control method of a distributed reactive power compensation system, described distributed reactive power compensation system comprises several compensating modules connected based on bus, it is characterized in that, utilize compensating module in distributed reactive power compensation system communication delay determination primary module and from module, and build reactive power compensation network; Reactive power compensation network described in primary module controls carries out reactive power compensation to electrical network, and if in compensation process primary module break down, then from described compensating module, again determine primary module according to communication delay and from module, and rebuild reactive power compensation network.
2. the power-less compensation control method of distributed reactive power compensation system as claimed in claim 1, is characterized in that, determines primary module by the following method and from module:
After electrification reset, each compensating module all sends primary module confirmation order to other compensating modules, if the primary module that current compensating module receives from other compensating modules in time delay process confirms order, then think that current compensating module is from module, otherwise, think that current compensating module is primary module.
3. the power-less compensation control method of distributed reactive power compensation system as claimed in claim 2, is characterized in that, proceeds as follows when primary module builds reactive power compensation network:
First verify each validity from module, and inquire about self according to the polling cycle timing preset and each is effectively from the module information of module, according to Query Result by self be effectively constructed as reactive power compensation network from module;
Described module information comprises the operating state of the compensation capacity of this compensating module, working method and each building-out capacitor.
4. the power-less compensation control method of distributed reactive power compensation system as claimed in claim 3, is characterized in that, verifies each validity from module by the following method:
Primary module successively to each from module sends Query Information according to each from the mailing address of module according to described polling cycle, for any one from module: if n polling cycle does not receive this information-reply returned from module continuously, then think that this is invalid from module, and inquire about next mailing address from module send Query Information; If receive the information-reply that this returns from module, then the return information received verifies: if verify unsuccessfully, then think that this is invalid from module; Otherwise, think that this is effective from module, and inquire about next mailing address send Query Information from module.
5. the power-less compensation control method of distributed reactive power compensation system as claimed in claim 4, it is characterized in that, the value of described n is 2 ~ 5.
6. as the power-less compensation control method of the distributed reactive power compensation system in Claims 1 to 5 as described in any one claim, it is characterized in that, in reactive power compensation process, confirm that primary module breaks down by the following method:
Primary module sends the confirmation that normally works of primary module according to the timing of described compensation cycle to each from module, if all from module all not receiving the confirmation of normal work of autonomous module, then think that described primary module breaks down.
7. the power-less compensation control method of distributed reactive power compensation system as claimed in claim 6, it is characterized in that, in reactive power compensation process, primary module is according to after the described compensation cycle timing confirmation that transmission primary module normally works to each from module, for any one from module, if primary module does not receive this return information from module, then think that this breaks down from module, this is removed reactive power compensation network from module by primary module from reactive power compensation network.
8. the power-less compensation control method of distributed reactive power compensation system as claimed in claim 7, is characterized in that, the reactive power compensation network described in primary module is controlled by following operation carries out reactive power compensation to electrical network:
(S1) primary module calculates reactive power and the power factor of each phase respectively according to the phase voltage of each phase of electrical network and phase current according to the compensation cycle preset;
(S2) according to described reactive power and power factor, and in described reactive power compensation network, the module information of each compensating module forms switching instruction, and sends to corresponding compensating module to control the switching of building-out capacitor in this compensating module.
9. the power-less compensation control method of distributed reactive power compensation system as claimed in claim 8, is characterized in that, forms switching instruction in described step (S2) based on following principle:
A () does not allow overcompensation, allow suitable undercompensation;
B () is owed added time and is preferentially dropped into three-phase total compensation and repay building-out capacitor in module, spend the added time and preferentially excise building-out capacitor in phase splitting compensation module;
C, during () switching, the building-out capacitor first dropped into first excises, excise after the building-out capacitor of rear input;
The switching state of building-out capacitor in a compensating module is only changed during (d) each switching.
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| CN105281343A (en) * | 2015-11-05 | 2016-01-27 | 上海追日电气有限公司 | Modular series-parallel filter compensation system and method |
| CN107706925A (en) * | 2017-11-28 | 2018-02-16 | 厦门亿力天龙科技有限公司 | A kind of control method based on anti-humorous low-voltage intelligent reactive compensation system |
| CN108206526A (en) * | 2018-01-22 | 2018-06-26 | 许继电源有限公司 | A kind of capacitor switching partition control method and device |
| CN109687384A (en) * | 2018-12-29 | 2019-04-26 | 苏州路之遥科技股份有限公司 | A kind of high-power excision protection and repositioning method based on calculating reactive power |
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| CN105162145A (en) * | 2015-10-13 | 2015-12-16 | 上海追日电气有限公司 | Master-slave harmonic reactive compensation generation system and method |
| CN105281343A (en) * | 2015-11-05 | 2016-01-27 | 上海追日电气有限公司 | Modular series-parallel filter compensation system and method |
| CN107706925A (en) * | 2017-11-28 | 2018-02-16 | 厦门亿力天龙科技有限公司 | A kind of control method based on anti-humorous low-voltage intelligent reactive compensation system |
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| CN109687384A (en) * | 2018-12-29 | 2019-04-26 | 苏州路之遥科技股份有限公司 | A kind of high-power excision protection and repositioning method based on calculating reactive power |
| CN114156908A (en) * | 2021-12-25 | 2022-03-08 | 江苏爱斯凯电气有限公司 | Power capacitance compensation device |
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