CN112636371A - Mixed type power load three-phase unbalance adjusting system - Google Patents
Mixed type power load three-phase unbalance adjusting system Download PDFInfo
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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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- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses a mixed type power load three-phase unbalance adjusting system, which comprises a distribution transformer, an intelligent controller, a 4G module/intelligent gateway, a TTU metering module, an active type three-phase unbalance adjusting module, a passive type three-phase unbalance adjusting and reactive power compensating module, an intelligent distribution module and a phase change switch, wherein the distribution transformer is respectively connected with the intelligent controller, the 4G module/intelligent gateway, the TTU metering module, the active type three-phase unbalance adjusting module, the passive type three-phase unbalance adjusting and reactive power compensating module and the intelligent distribution module; reactive compensation and three-phase unbalance adjustment can be both considered; the response speed is high, and voltage flicker and fluctuation are avoided; no harmonic current pollution, higher safety, better reliability and the like.
Description
Technical Field
The invention relates to the technical field of power quality control of a power distribution network, in particular to a mixed type power load three-phase unbalance adjusting system.
Background
The low-voltage distribution area mainly faces to residential electricity consumption, is mainly single-phase users, and has relatively serious three-phase imbalance in actual operation due to randomness of electricity consumption periods of the users, mixed use of single-phase and three-phase loads and the like.
Three-phase voltage or current imbalances can cause a series of hazards to power systems and users: firstly, line loss is increased, when a three-phase four-wire system works under the condition of three-phase imbalance, a neutral line has current, and the line loss is increased; secondly, the transformer loss is increased, and when the transformer works in an unbalanced state, zero-sequence current generated by the transformer can cause zero-sequence magnetic flux to appear, so that the transformer is heated seriously, and the service life is shortened; finally, a low voltage problem is generated, and the safety of power utilization cannot be guaranteed. The three-phase imbalance can cause the unequal voltage drop of three phases in the transformer, the voltage of one phase of heavy load is reduced, low voltage is caused, the voltage of one phase of light load is increased, the electric equipment is damaged, unsafe accidents occur, and the electric reliability is reduced.
In order to comprehensively implement the working policy of 'overall planning, unified standard, pilot advance and integral propulsion' for constructing the intelligent power grid, the standardization and standardization level of the engineering construction of the intelligent power distribution station area of the rural power grid are improved, the intelligent development requirements of the rural power grid and new requirements of customers on power supply capacity, power supply quality and power supply service are met, the power supply capacity and power supply reliability are improved, the operation management level and the service capacity are improved, and the construction of the intelligent low-voltage power distribution station area of the rural power grid is an inevitable trend.
Hazard of three-phase imbalance: in a low-voltage distribution network system, a three-phase four-wire system is generally adopted, most of power terminals are single-phase loads or single-phase and three-phase loads are mixed, the loads are different in size, and the power utilization time is not fixed. Three-phase current imbalance widely exists in a power grid, the imbalance condition is irregular, and the main damage to power distribution and utilization equipment is as follows: the power loss of the line is additionally increased, and unnecessary electricity charge expenditure of a user is caused; the copper loss of the distribution transformer is increased, the output degree of the distribution transformer is reduced, and the long-term reliable operation of the distribution transformer is influenced; the output power of the motor is reduced, so that the temperature of a winding of the motor is increased, and the safe operation of the motor is endangered; further imbalance of three-phase voltage may be caused, so that the electric equipment mounted on the phase with high voltage is burnt out, and the electric equipment mounted on the phase with low voltage cannot be normally used.
Traditional unbalanced three-phase adjustment mode and characteristics thereof:
1) phase change switch technology:
the commutation switch technology is composed of an intelligent commutation terminal (responsible for load monitoring and automatic commutation control) and a plurality of commutation switch units (responsible for executing load commutation operating mechanisms). The intelligent phase change terminal monitors three-phase current of the distribution transformer low-voltage outgoing line in real time, if three-phase load unbalance degree of a distribution transformer low-voltage side exceeds the limit in a certain monitoring period, the intelligent phase change terminal reads current and phase sequence real-time data of the distribution transformer low-voltage outgoing line and load branches of all phase change switch units, optimization calculation is carried out, an optimal phase change instruction is sent out, phase change actions are carried out by the phase change switches according to the instruction, user loads are adjusted, and three-phase load balance distribution of a power distribution station area is achieved. All single-phase or two-phase loads are divided into a plurality of groups according to ABC three phases, and each group is controlled by an electronic switch for phase change. Three-phase imbalance is relieved to a certain extent, but when the load in each group changes dynamically or the grouping is not accurate enough, the three-phase imbalance always exists in the system. In addition, there are also voltage flicker and droop during the commutation.
2) Pure passive compensation technology:
according to the wangs theorem (Wang's theorem), the split-phase capacitor is switched, the reactive current of each phase is regulated, the interphase capacitor is switched, and the interphase active current is transferred. The specific regulating effect of the three-phase unbalance depends on the grouping number and capacity level difference of the interphase capacitor and the split-phase capacitor. In the actual use process, due to the discreteness of the capacitance capacity, the system still has unbalance to a certain extent, and when the load changes rapidly, the capacitance is switched back and forth frequently, and the aging of the capacitance is accelerated. In addition, in some application occasions, the reactive compensation and the three-phase unbalanced current regulation cannot be considered simultaneously.
3) Pure active compensation technology:
the system comprises a pure active compensation technology (low-voltage static reactive power compensation device SVG and active filter APF), an electric energy quality comprehensive treatment device adopting a high-power turn-off type power electronic switch technology, a trigger pulse signal generated by a Space Vector Pulse Width Modulation (SVPWM) control method through rapidly detecting reactive, negative sequence and harmonic current at an access position to drive and control a thyristor to output compensation current with the same magnitude and opposite direction with the detected reactive, negative sequence and harmonic current, and the problems of reactive power, harmonic wave, voltage fluctuation, three-phase load unbalance and the like in a power distribution area are comprehensively solved.
The passive compensation technology and the active compensation technology respectively realize three-phase load balance of a distribution transformer low-voltage outlet through inter-phase power transfer and output of compensation current, and the problem of actual load balanced distribution cannot be fundamentally solved. However, the phase-change switch technology is only suitable for distribution transformer areas with power factors of the low-voltage side of the distribution transformer more than 0.85, and certain adjustment level difference exists, so that finer adjustment cannot be achieved.
Disclosure of Invention
The invention aims to provide a hybrid electric load three-phase imbalance adjusting system to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a mixed type power load unbalanced three phase governing system, includes distribution transformer, intelligent control ware, 4G module intelligent gateway, TTU metering module, active type unbalanced three phase governing module, passive type unbalanced three phase governing and reactive compensation module, intelligent distribution module and commutation switch, distribution transformer connects intelligent control ware, 4G module intelligent gateway, TTU metering module, active type unbalanced three phase governing module, passive type unbalanced three phase governing and reactive compensation module and intelligent distribution module respectively, and intelligent distribution module still connects the commutation switch, and the commutation switch still connects single-phase load.
As a further technical scheme of the invention: the phase change switch and the single-phase load are both provided with a plurality of phase change switches and are in one-to-one correspondence.
As a further technical scheme of the invention: and the intelligent controller controls the switching of the phase change switch through a wireless signal.
As a further technical scheme of the invention: the commutation switch is a combination of a single phase contactor and power electronics.
As a further technical scheme of the invention: the active three-phase unbalance adjusting module, the passive three-phase unbalance adjusting and reactive power compensating module are respectively provided with a zero-cross switch array to carry out dynamic switching on a capacitor core group, and the capacitor core group comprises an interphase capacitor and a single-phase capacitor, so that reactive power and unbalance current rough compensation is realized.
As a further technical scheme of the invention: when the capacitor compensation unit cannot meet the compensation requirement of the unbalanced current, under the intelligent decision of the unified coordination controller, a proper PWM (pulse width modulation) switching signal is output to the IGBT module, and fundamental current with adjustable three-phase amplitude and phase is inverted to realize the fine compensation of the unbalanced current.
As a further technical scheme of the invention: when the capacitor compensation unit cannot meet the compensation requirement of reactive voltage, under the intelligent decision of the unified coordination controller, a proper PWM (pulse width modulation) switching signal is output to the IGBT module, fundamental voltage with adjustable three-phase amplitude and phase is inverted, the fine compensation of the reactive power is realized, and the power factor can be compensated to 0.99-1 usually.
Compared with the prior art, the invention has the beneficial effects that: the invention can realize smooth adjustment of three-phase unbalance; reactive compensation and three-phase unbalance adjustment can be both considered; the response speed is high, and voltage flicker and fluctuation are avoided; no harmonic current pollution, higher safety, better reliability and the like.
Drawings
Fig. 1 is a schematic diagram of a power grid application of a hybrid electric load three-phase imbalance adjusting system according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit topology diagram of a hybrid electrical load three-phase imbalance adjusting system according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a phase change switch of a hybrid electric load three-phase imbalance adjusting system according to an embodiment of the present application;
fig. 4 is a schematic diagram of three-phase separate compensation of interphase capacitors of a hybrid electric load three-phase imbalance adjusting system according to an embodiment of the present application;
fig. 5 is a schematic diagram of a three-phase separate compensation of a single-phase capacitor of a hybrid electric load three-phase imbalance adjusting system according to an embodiment of the present application;
fig. 6 is a schematic diagram of three-phase unbalanced current regulation of a hybrid electrical load three-phase unbalanced regulation system according to an embodiment of the present disclosure;
fig. 7 is a control flowchart of a hybrid electric load three-phase imbalance adjusting system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 1-7, a hybrid electric load three-phase imbalance adjusting system includes a distribution transformer, an intelligent controller, a 4G module/intelligent gateway, a TTU metering module, an active three-phase imbalance adjusting module, a passive three-phase imbalance adjusting and reactive power compensating module, an intelligent distribution module, and a phase change switch, wherein the distribution transformer is connected to the intelligent controller, the 4G module/intelligent gateway, the TTU metering module, the active three-phase imbalance adjusting module, the passive three-phase imbalance adjusting and reactive power compensating module, and the intelligent distribution module, the intelligent distribution module is further connected to the phase change switch, and the phase change switch is further connected to a single-phase load.
The core of the design is composed of an intelligent controller of a transformer area, a passive compensation technology, an active compensation technology and a plurality of phase change switches, and series optimization design is carried out on grid-connected component parameters, so that the grid-connected component parameters are more suitable for unbalance control of system fundamental wave current, and the calculation formula of the three-phase unbalance degree is as follows:
The invention is applied to the field of low-voltage distribution, is arranged on the low-voltage side (0.4kV) of a 10kV transformer and is used for improving the power quality of power supply. The other incoming and outgoing lines have the same requirements as those of the original low-voltage distribution box.
As shown in figure 1, the load current signal is collected in real time by the measuring mutual inductor, fundamental wave reactive power, fundamental wave unbalance and each subharmonic component in the load current signal are quickly extracted by an internal special detection circuit, and the phase change switch is controlled to be specifically put into a certain phase under the intelligent decision of the unified coordination controller, so that the rough compensation of the unbalanced current is realized. Generally, in a low-voltage power supply system, the number of the phase change switches is configured to be multiples of 3, such as 6, 9, 12 and the like. As shown in fig. 2 and 3. The switching of the phase change switch has larger step difference, so that after the phase change switch is put into use, the unbalance degree of the three phases can be reduced to about 15 percent, and the requirements of a power supply department on the regulation of the unbalance degree of the three phases can be basically met. However, when the phase change switch is simply put into operation, reactive compensation cannot be performed, and reactive compensation and fine adjustment of active technology are required to be added to the system for fine adjustment of three-phase unbalance and harmonic compensation.
As shown in fig. 2, the switching of the commutation switch is controlled by a wireless signal, so that the rough compensation of the unbalanced current is realized.
Example 2: on the basis of example 1: as shown in fig. 3, the phase change switch adopted by the invention is a combination of a single-phase contactor and a power electronic device, three phases have electrical and mechanical interlocking, only one phase can be put into the phase, and two phases or three phases are prevented from being short-circuited.
Example 3: on the basis of example 2: as shown in fig. 4 and 5, the zero-cross switch array is installed to dynamically switch the capacitor core group, which includes the inter-phase capacitors and the single-phase capacitors, so as to realize rough compensation of reactive and unbalanced currents. According to the wangs theorem (Wang's theorem), the split-phase capacitor is switched, the reactive current of each phase is regulated, the interphase capacitor is switched, and the interphase active current is transferred. As shown in the figures 4 and 5, under the intelligent decision of the unified coordination controller, the zero-crossing switch array (FK 1-3 in figure 4 and FK 4-6 in figure 5) is controlled to dynamically switch the capacitor core group (C1-C3 in figure 4 and NCa-NCc in figure 5), so that the rough compensation of reactive power and unbalanced current is realized. The specific regulating effect of the three-phase unbalance depends on the grouping number and capacity level difference of the interphase capacitor and the split-phase capacitor. In the actual use process, due to the discreteness of the capacitance capacity, the system still has unbalance to a certain extent, and when the load changes rapidly, the capacitance is switched back and forth frequently, and the aging of the capacitance is accelerated. In addition, in some application occasions, the reactive compensation and the three-phase unbalanced current regulation cannot be considered simultaneously. Therefore, after the capacitor core group is put into use, the three-phase unbalance can be reduced to about 10%, reactive compensation and fine adjustment and harmonic compensation of the three-phase unbalance cannot be performed, and an active technology needs to be added to a system to perform fine adjustment on the reactive compensation and the three-phase unbalance.
Example 4: on the basis of example 3: as shown in fig. 6, when the capacitor compensation unit cannot meet the compensation requirement of the unbalanced current, under the intelligent decision of the unified coordination controller, a suitable PWM switching signal is output to the IGBT module, and a fundamental current with adjustable three-phase amplitude and phase is inverted to realize the fine compensation of the unbalanced current. As shown in fig. 6, when the grid current is adjusted to a balanced state of 100A in a state of unbalanced grid three-phase current caused by unbalanced load, in which the load power of a phase is 52A, if the grid is adjusted to 100A, the phase current offset amount will remain 48A, and similarly, the phase current offset amount of C lacks 48A, the unbalanced load three-phase adjusting device for the active and passive combined power load will transfer the offset current 48A of the a phase to the C phase, so as to achieve the purpose of ensuring the unbalanced power of the load side, and the three-phase current of the grid is balanced. By adopting the rapidity and the continuity of IGBT adjustment, the reactive compensation and the three-phase unbalance can be compensated more finely, generally, the three-phase unbalance can be reduced to about 5 percent by adopting the technology, the power factor can be compensated to 0.99, and the smooth, continuous and fine adjustment of the reactive compensation and the three-phase unbalance can be realized.
The invention collects the three-phase current waveform of the system in real time, extracts the positive sequence, negative sequence and zero sequence waveforms of the fundamental current, synthesizes the reactive compensation and three-phase unbalance requirements of the system, immediately synthesizes corresponding command waveforms to be sent to the IGBT inverter, outputs partial harmonic current capable of offsetting the system and achieves the function of inhibiting partial harmonic current generated by the load. The overall flow is shown in fig. 7.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a mixed type power load unbalanced three phase governing system, includes distribution transformer, intelligent control ware, 4G module intelligent gateway, TTU metering module, active type unbalanced three phase governing module, passive type unbalanced three phase regulation and reactive compensation module, intelligent distribution module and commutation switch, its characterized in that, distribution transformer connects intelligent control ware, 4G module intelligent gateway, TTU metering module, active type unbalanced three phase governing module, passive type unbalanced three phase regulation and reactive compensation module and intelligent distribution module respectively, and intelligent distribution module still connects the commutation switch, and the commutation switch still connects single-phase load.
2. The hybrid electric load three-phase imbalance regulation system of claim 1, wherein the phase change switches and the single-phase loads are provided in a plurality and in a one-to-one correspondence.
3. The hybrid electric load three-phase imbalance regulation system of claim 1, wherein the intelligent controller controls switching of the phase change switch through wireless signals.
4. The hybrid electrical load three-phase imbalance regulation system of claim 1, wherein the commutation switch is a combination of a single-phase contactor and power electronics.
5. The hybrid electric load three-phase imbalance adjusting system according to claim 1, wherein the active three-phase imbalance adjusting module, the passive three-phase imbalance adjusting module and the reactive power compensation module are respectively provided with a zero-cross switch array to dynamically switch a capacitor core group, and the capacitor core group comprises an inter-phase capacitor and a single-phase capacitor, so that the reactive power and the imbalance current are roughly compensated.
6. The hybrid electric load three-phase imbalance adjusting system according to claim 5, wherein when the capacitor compensation unit cannot meet the compensation requirement of the imbalance current, under the intelligent decision of the unified coordination controller, a proper PWM switching signal is output to the IGBT module, and fundamental current with adjustable three-phase amplitude and phase is inverted to realize the fine compensation of the imbalance current.
7. The hybrid electric load three-phase imbalance adjusting system according to claim 5, wherein when the capacitor compensation unit cannot meet the compensation requirement of reactive voltage, under the intelligent decision of the unified coordination controller, a proper PWM switching signal is output to the IGBT module, a fundamental voltage with adjustable three-phase amplitude and phase is inverted, the fine compensation of reactive power is realized, and the power factor can be generally compensated to 0.99-1.
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| CN202011441306.2A CN112636371A (en) | 2020-12-08 | 2020-12-08 | Mixed type power load three-phase unbalance adjusting system |
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| CN202011441306.2A CN112636371A (en) | 2020-12-08 | 2020-12-08 | Mixed type power load three-phase unbalance adjusting system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769230A (en) * | 2017-11-20 | 2018-03-06 | 广东正诚电气科技有限公司 | A kind of active and passive combination power load three-phase imbalance adjusting means |
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| CN209313449U (en) * | 2019-02-19 | 2019-08-27 | 上海英同电气有限公司 | Three-phase imbalance mixed compensation governing system |
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2020
- 2020-12-08 CN CN202011441306.2A patent/CN112636371A/en active Pending
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|---|---|---|---|---|
| CN107769230A (en) * | 2017-11-20 | 2018-03-06 | 广东正诚电气科技有限公司 | A kind of active and passive combination power load three-phase imbalance adjusting means |
| CN108321815A (en) * | 2018-03-08 | 2018-07-24 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network utility power quality control system and method |
| CN209313449U (en) * | 2019-02-19 | 2019-08-27 | 上海英同电气有限公司 | Three-phase imbalance mixed compensation governing system |
| CN109980661A (en) * | 2019-03-07 | 2019-07-05 | 武汉武新电气科技股份有限公司 | A kind of load unbalanced automatic regulating system of three-phase comprehensive of bimodulus communication |
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