CN101179197A - Three-phase load automatic equalization device of power distribution network - Google Patents

Three-phase load automatic equalization device of power distribution network Download PDF

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Publication number
CN101179197A
CN101179197A CNA2007101447281A CN200710144728A CN101179197A CN 101179197 A CN101179197 A CN 101179197A CN A2007101447281 A CNA2007101447281 A CN A2007101447281A CN 200710144728 A CN200710144728 A CN 200710144728A CN 101179197 A CN101179197 A CN 101179197A
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China
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connected
module
output
input
inverter
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CNA2007101447281A
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Chinese (zh)
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英晓东
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黑龙江中星科技股份有限公司
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Priority to CNA2007101447281A priority Critical patent/CN101179197A/en
Publication of CN101179197A publication Critical patent/CN101179197A/en

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50Arrangements for eliminating or reducing asymmetry in polyphase networks

Abstract

The invention provides an automatic balance device of a distribution network with three-phase load balance, which relates to a device able to automatically regulate the distribution network with three-phase load balance, aiming to solving problems that in the prior art, an adjustment method of the distribution network three-phases load balance is only able to cause the distribution network nearly to the three-phase balance with the disadvantages of waste of time and vigor, requirement of a shutdown and delay manufacture. In the invention, a voltage detection module, an electric current detection module, a voltage across-zero-aberration detection module and a solider relay and power-supply module are connected with the three-phase distribution network; the voltage detection module and the electric current detection module are connected with an electric energy computation module; the electric energy computation module is connected with an interface electric level switching module; the interface electric level switching module is connected with a master controller; the voltage across-zero-aberration detection module is connected with a slave controller; the control input terminal of the slave controller is connected with a control output terminal of the master controller; the solider relay is connected with a first rectifier; the solider relay is connected with the slave controller; the first rectifier is connected with a first inverter; the first inverter is connected with a parallel-in module, and the parallel-in module is connected with the three-phase distribution network.

Description

Three-phase load automatic equalization device of power distribution network

Technical field

The present invention relates to a kind of device of automatic adjusting power distribution network threephase load balance.

Background technology

A subject matter that exists in the power distribution network of town and country at present is the threephase load imbalance, can cause very big influence with transmission to the production of electric power, and unbalanced gap is excessive even can damage power equipment.The threephase load imbalance is mainly got one and is caused mutually owing to big multi-user only appoints from three-phase when the electricity consumption, the main method that solves is exactly that electric power operation department is according to each phase load situation at present, look for big electricity consumption unit labor cost to adjust the electricity consumption of their unit, make the load integral body of this district's electrical network three-phase be tending towards in a basic balance, the threephase load difference is within allowed band.The main problem of this method is exactly only to make power distribution network be tending towards three-phase equilibrium, waste time and energy, required adjustment need to stop work, delay ordinary production with electric unit.

Summary of the invention

The present invention for only can making of solving that existing power distribution network threephase load balance adjusting method exists power distribution network is tending towards three-phase equilibrium, wastes time and energy, required adjustment need to stop work, delay the problem of ordinary production with electric unit, and provide a kind of three-phase load automatic equalization device of power distribution network.The present invention comprises master controller 1, slave controller 2, voltage detection module 3, current detection module 4, electric energy metrical module 5, interface level modular converter 6, voltage zero-cross detection module 7, solid-state relay 9, first rectifier 10, first inverter 11, module 13 is incorporated into the power networks, power module 14 and voltage transformation module 15, four inputs of voltage detection module 3 respectively with the A of three-phase distribution net, B, C is connected with N, the output of voltage detection module 3 is connected with the voltage detecting input of electric energy metrical module 5, four inputs of current detection module 4 respectively with the A of three-phase distribution net, B, C is connected with N, the output of current detection module 4 is connected with the current detecting input of electric energy metrical module 5, the output of electric energy metrical module 5 is connected with the input of interface level modular converter 6, the output of interface level modular converter 6 is connected with the detection input of master controller 1, four inputs of voltage zero-cross detection module 7 respectively with the A of three-phase distribution net, B, C is connected with N, the output of voltage zero-cross detection module 7 detects input with the voltage zero-cross of slave controller 2 and is connected, the control input end of slave controller 2 is connected with the control output end of master controller 1, four inputs of solid-state relay 9 respectively with the A of three-phase distribution net, B, C is connected with N, first output of solid-state relay 9 is connected with the input of first rectifier 10, the control input end of solid-state relay 9 is connected with the relay control output end of slave controller 2, the output of first rectifier 10 is connected with the input of first inverter 11, the control input end of first inverter 11 is connected with the first inversion control output of slave controller 2, the output of first inverter 11 is connected with the input of the module 13 that is incorporated into the power networks, the control input end of the module that is incorporated into the power networks 13 is connected with the control output end of being incorporated into the power networks of slave controller 2, four outputs of the module that is incorporated into the power networks 13 respectively with the A of three-phase distribution net, B, C is connected with N, four inputs of power module 14 respectively with the A of three-phase distribution net, B, C is connected with N, the output of power module 14 is connected with the input of voltage transformation module 15, the main power source output of voltage transformation module 15 is connected with the power input of master controller 1, being connected from the power input of power output end with slave controller 2 of voltage transformation module 15.

The invention has the beneficial effects as follows: can realize load low one give when identical load high two-phase power supply, can realize that the low two-phase of load is simultaneously to the high power supply mutually of load, also can realize load low one give load a high power supply mutually mutually separately, make total load in three alternate balanced distribution, make three alternate voltages, current balance, eliminate the phase shortage phenomenon, reducing whole transformer load end line decreases, make transformer threephase load balance, prolong transformer useful life, make transformer stable, prevent that simultaneously transformer is single-phase or two phase loads are overweight, make brownout, cause phase shortage that power consumption equipment can't be turned round, perhaps the excessive power consumption equipment that burns of electric current; Device of the present invention can also in parallelly insert the output of transformer or be connected on the front end of the uneven multinomial load of severe three-phase, and balanced three-phase load does not need during access original transmission line outage, easy construction.

Description of drawings

Fig. 1 is an electrical block diagram of the present invention; Fig. 2 is the electrical block diagram of embodiment two; Fig. 3 is the electrical block diagram of embodiment three; Fig. 4 is the electrical block diagram of embodiment four~eight.

Embodiment

Embodiment one: referring to Fig. 1, present embodiment is by master controller 1, slave controller 2, voltage detection module 3, current detection module 4, electric energy metrical module 5, interface level modular converter 6, voltage zero-cross detection module 7, solid-state relay 9, first rectifier 10, first inverter 11, module 13 is incorporated into the power networks, power module 14 and voltage transformation module 15 are formed, four inputs of voltage detection module 3 respectively with the A of three-phase distribution net, B, C is connected with N, the output of voltage detection module 3 is connected with the voltage detecting input of electric energy metrical module 5, four inputs of current detection module 4 respectively with the A of three-phase distribution net, B, C is connected with N, the output of current detection module 4 is connected with the current detecting input of electric energy metrical module 5, the output of electric energy metrical module 5 is connected with the input of interface level modular converter 6, the output of interface level modular converter 6 is connected with the detection input of master controller 1, four inputs of voltage zero-cross detection module 7 respectively with the A of three-phase distribution net, B, C is connected with N, the output of voltage zero-cross detection module 7 detects input with the voltage zero-cross of slave controller 2 and is connected, the control input end of slave controller 2 is connected with the control output end of master controller 1, four inputs of solid-state relay 9 respectively with the A of three-phase distribution net, B, C is connected with N, first output of solid-state relay 9 is connected with the input of first rectifier 10, the control input end of solid-state relay 9 is connected with the relay control output end of slave controller 2, the output of first rectifier 10 is connected with the input of first inverter 11, the control input end of first inverter 11 is connected with the first inversion control output of slave controller 2, the output of first inverter 11 is connected with the input of the module 13 that is incorporated into the power networks, the control input end of the module that is incorporated into the power networks 13 is connected with the control output end of being incorporated into the power networks of slave controller 2, four outputs of the module that is incorporated into the power networks 13 respectively with the A of three-phase distribution net, B, C is connected with N, four inputs of power module 14 respectively with the A of three-phase distribution net, B, C is connected with N, the output of power module 14 is connected with the input of voltage transformation module 15, the main power source output of voltage transformation module 15 is connected with the power input of master controller 1, being connected from the power input of power output end with slave controller 2 of voltage transformation module 15.Described master controller 1 and slave controller 2 can adopt TMS320F2809 type microprocessor, described voltage transformation module 15 can adopt TPS70151 type microprocessor, described electric energy metrical module 5 can adopt ATT7022A type microprocessor, described interface level modular converter 6 can adopt DS1302 type microprocessor, described voltage zero-cross detection module 7 adopts LM339 type microprocessor device as a comparison, described first inverter 11 can adopt SKN type inverter, the described module 13 that is incorporated into the power networks can adopt the Muli2 type control module that is incorporated into the power networks, and described power module 14 can adopt VIPAC series A C-DC power supply.

Operation principle: suppose A, B phase load imbalance, the A phase load is big, and the B phase load is little, and C is mutually normal, and gross power is P=U AI ACos +U BI BCos +U cI cCos  is less than rated power.For making the transformer load balance, provide the part electric current to satisfy the demands mutually mutually by B to A, demand is Δ I.A after the balance, B phase current are respectively I A'=I A-Δ I, I B'=I B+ Δ I, power is

P′=U AI′ Acos+U BI B′cos+U cI ccos

=U A(I A-ΔI)cos+U B(I B+ΔI)cos+U cI ccos

=U AI Acos+U BI Bcos+U cI ccos (1)

From formula (1) as can be seen the gross power after the equilibrium with balanced before gross power equate that but every electric current changes, transformer output terminals A phase current reduces, the big electric current that is provided has been compensated mutually by B, like this for transformer, load reaches equilibrium.Voltage detection module 3 of the present utility model, current detection module 4 and electric energy metrical module 5 are sent to master controller 1 with each the phase load situation of three-phase distribution net that collects, master controller 1 is adjusted task division by the switch of control solid-state relay 9 to the present load situation, realize that A, B, C switch mutually, make transformer load obtain balanced the distribution.When a certain phase or two-phase provide electric energy to share other phase load to other mutually, alternate access first rectifier 10 with N at first mutually, realize that this phase electric energy direct current mode exports, then direct current is inserted first inverter 11, be input to the module 13 that is incorporated into the power networks by first inverter 11, select the load height output electric energy that is incorporated into the power networks mutually by the slave controller 2 control module 13 that is incorporated into the power networks, and indexs such as the phase angular frequency of output voltage phase place and load height are consistent, single-phase grid-connected output is inserted between the high phase and N phase of load, realize that the low height of giving mutually of load provides electric energy and the purpose of balanced three-phase load mutually.

Embodiment two: referring to Fig. 2; present embodiment has increased overcurrent protection module 8 on the basis of embodiment one; four inputs of overcurrent protection module 8 are connected with A, B, C and the N of three-phase distribution net respectively; the control input end of overcurrent protection module 8 is connected with the overcurrent protection control output end of slave controller 2, and four outputs of overcurrent protection module 8 are connected with four inputs of solid-state relay 9 respectively.When the electric current in the three-phase distribution net during, finish overcurrent protection by slave controller 2 control overcurrent protection module 8 greater than the rated value of operation element.

Embodiment three: referring to Fig. 3, present embodiment has increased by second rectifier 24 and second inverter 25 on the basis of embodiment one, the input of second rectifier 24 is connected with second output of solid-state relay 9, the output of second rectifier 24 is connected with the input of second inverter 25, the output of second inverter 25 is connected with second input of the module 13 that is incorporated into the power networks, and the control input end of second inverter 25 is connected with the second inversion control output of slave controller 2.Can realize that by two groups of rectifiers and two groups of inverters one gives a phase mutually, one gives two-phase mutually, and two-phase is given a power supply mutually.

Embodiment four: referring to Fig. 4, present embodiment has increased inverter output voltage value detection module 12 on the basis of embodiment one, the input of the inverter output voltage value testing circuit 12 and the module 13 that is incorporated into the power networks all is connected with the output of first inverter 11, and the output of inverter output voltage value testing circuit 12 detects input with the inverter voltage of slave controller 2 and is connected.The effect of inverter output voltage value detection module 12 is to judge after the inversion whether satisfy condition: a that is incorporated into the power networks, make inverter output voltage closely equal with the civil power crimping, and pressure reduction is in 10%; B, inverter output frequency be near mains frequency, and frequency difference is in ± 4Hz; The phase place of c, inverter output voltage and line voltage is identical, and phase difference is in ± 10 °.If satisfy condition then implement to be incorporated into the power networks, otherwise will continue to adjust by slave controller 2.

Embodiment five: referring to Fig. 4, present embodiment has increased by first jtag interface 16 and second jtag interface 17 on the basis of embodiment one, the input/output terminal of first jtag interface 16 is connected with the JTAG data input/output terminal of master controller 1, and the input/output terminal of second jtag interface 17 is connected with the JTAG data input/output terminal of slave controller 2.Jtag interface is used under DSP Integrated Development Environment CCS, by the online programming of jtag interface realization to Flash.

Embodiment six: referring to Fig. 4, present embodiment has increased RS485 serial line interface 19 and RS232 serial line interface 20 on the basis of embodiment one, the input/output terminal of RS485 serial line interface 19 is connected with the RS485 serial data input/output terminal of master controller 1, and the input/output terminal of RS232 serial line interface 20 is connected with the RS232 serial data input/output terminal of master controller 1.But between RS485 serial line interface 19 and RS232 serial line interface 20 implement devices and the device, device and PC background communication and Long-distance Control.

Embodiment seven: referring to Fig. 4, present embodiment has increased SD interface 21 on the basis of embodiment one, and the input/output terminal of SD interface 21 is connected with the SD card data input/output terminal of master controller 1.Can write down on-the-spot running state data by the SD card after inserting SD card 21.

Embodiment eight: referring to Fig. 4, present embodiment has increased display interface 22 and keyboard interface 23 on the basis of embodiment one, the input of display interface 22 is connected with the video data output of master controller 1, and the output of keyboard interface 23 is connected with the button data input of master controller 1.The user can be input in the device by keyboard interface 23 device parameters according to the distribution situation of different regions, and passes through the operation conditions of display interface 22 monitoring arrangements.

Claims (8)

1. three-phase load automatic equalization device of power distribution network, it is characterized in that it comprises master controller (1), slave controller (2), voltage detection module (3), current detection module (4), electric energy metrical module (5), interface level modular converter (6), voltage zero-cross detection module (7), solid-state relay (9), first rectifier (10), first inverter (11), the module that is incorporated into the power networks (13), power module (14) and voltage transformation module (15), four inputs of voltage detection module (3) respectively with the A of three-phase distribution net, B, C is connected with N, the output of voltage detection module (3) is connected with the voltage detecting input of electric energy metrical module (5), four inputs of current detection module (4) respectively with the A of three-phase distribution net, B, C is connected with N, the output of current detection module (4) is connected with the current detecting input of electric energy metrical module (5), the output of electric energy metrical module (5) is connected with the input of interface level modular converter (6), the output of interface level modular converter (6) is connected with the detection input of master controller (1), four inputs of voltage zero-cross detection module (7) respectively with the A of three-phase distribution net, B, C is connected with N, the output of voltage zero-cross detection module (7) detects input with the voltage zero-cross of slave controller (2) and is connected, the control input end of slave controller (2) is connected with the control output end of master controller (1), four inputs of solid-state relay (9) respectively with the A of three-phase distribution net, B, C is connected with N, first output of solid-state relay (9) is connected with the input of first rectifier (10), the control input end of solid-state relay (9) is connected with the relay control output end of slave controller (2), the output of first rectifier (10) is connected with the input of first inverter (11), the control input end of first inverter (11) is connected with the first inversion control output of slave controller (2), the output of first inverter (11) is connected with the input of the module that is incorporated into the power networks (13), the control input end of the module that is incorporated into the power networks (13) is connected with the control output end of being incorporated into the power networks of slave controller (2), four outputs of the module that is incorporated into the power networks (13) respectively with the A of three-phase distribution net, B, C is connected with N, four inputs of power module (14) respectively with the A of three-phase distribution net, B, C is connected with N, the output of power module (14) is connected with the input of voltage transformation module (15), the main power source output of voltage transformation module (15) is connected with the power input of master controller (1), being connected from the power input of power output end with slave controller (2) of voltage transformation module (15).
2. three-phase load automatic equalization device of power distribution network according to claim 1; it is characterized in that it has increased overcurrent protection module (8); four inputs of overcurrent protection module (8) are connected with A, B, C and the N of three-phase distribution net respectively; the control input end of overcurrent protection module (8) is connected with the overcurrent protection control output end of slave controller (2), and four outputs of overcurrent protection module (8) are connected with four inputs of solid-state relay (9) respectively.
3. three-phase load automatic equalization device of power distribution network according to claim 1, it is characterized in that it has increased by second rectifier (24) and second inverter (25), the input of second rectifier (24) is connected with second output of solid-state relay (9), the output of second rectifier (24) is connected with the input of second inverter (25), the output of second inverter (25) is connected with second input of the module that is incorporated into the power networks (13), and the control input end of second inverter (25) is connected with the second inversion control output of slave controller (2).
4. three-phase load automatic equalization device of power distribution network according to claim 1, it is characterized in that it has increased inverter output voltage value detection module (12), the input of inverter output voltage value testing circuit (12) and the module that is incorporated into the power networks (13) all is connected with the output of first inverter (11), and the output of inverter output voltage value testing circuit (12) detects input with the inverter voltage of slave controller (2) and is connected.
5. three-phase load automatic equalization device of power distribution network according to claim 1, it is characterized in that it has increased by first jtag interface (16) and second jtag interface (17), the input/output terminal of first jtag interface (16) is connected with the JTAG data input/output terminal of master controller (1), and the input/output terminal of second jtag interface (17) is connected with the JTAG data input/output terminal of slave controller (2).
6. three-phase load automatic equalization device of power distribution network according to claim 1, it is characterized in that it has increased RS485 serial line interface (19) and RS232 serial line interface (20), the input/output terminal of RS485 serial line interface (19) is connected with the RS485 serial data input/output terminal of master controller (1), and the input/output terminal of RS232 serial line interface (20) is connected with the RS232 serial data input/output terminal of master controller (1).
7. three-phase load automatic equalization device of power distribution network according to claim 1 is characterized in that it has increased SD interface (21), and the input/output terminal of SD interface (21) is connected with the SD card data input/output terminal of master controller (1).
8. three-phase load automatic equalization device of power distribution network according to claim 1, it is characterized in that it has increased display interface (22) and keyboard interface (23), the input of display interface (22) is connected with the video data output of master controller (1), and the output of keyboard interface (23) is connected with the button data input of master controller (1).
CNA2007101447281A 2007-12-03 2007-12-03 Three-phase load automatic equalization device of power distribution network CN101179197A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102035227A (en) * 2009-10-02 2011-04-27 新明和工业株式会社 Charging control method of mechanical parking equipment and control device thereof
CN102055202A (en) * 2011-01-21 2011-05-11 浙江浙大网新能源技术有限公司 Three-phase balancing power-supply energy-saving control management system
CN102487197A (en) * 2010-12-01 2012-06-06 广东西电动力科技股份有限公司 Three-phase load balancer of small-power set
CN102832632A (en) * 2012-09-14 2012-12-19 重庆大学 Controllable interphase power transfer method and system
CN103138292A (en) * 2011-11-28 2013-06-05 施耐德电器工业公司 Method and system for dynamic management of electricity distribution grid
CN103490382A (en) * 2013-09-09 2014-01-01 南京南瑞太阳能科技有限公司 Grid connection safety device and control method for distributed photovoltaic power generation system
CN104198853A (en) * 2014-08-27 2014-12-10 江苏科技大学 Wind power grid integration testing device and testing method
CN106159984A (en) * 2016-08-12 2016-11-23 广州德昊电力科技有限公司 A kind of alternate transfer system of three phase network energy
CN107221942A (en) * 2016-11-18 2017-09-29 都书言 A kind of multinomial energy transfer device and its control method

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102035227B (en) * 2009-10-02 2013-12-25 新明和工业株式会社 Charging control method of mechanical parking equipment and control device thereof
TWI493826B (en) * 2009-10-02 2015-07-21 Shinmaywa Ind Ltd The charging control method and control device of the mechanical parking device
CN102035227A (en) * 2009-10-02 2011-04-27 新明和工业株式会社 Charging control method of mechanical parking equipment and control device thereof
CN102487197A (en) * 2010-12-01 2012-06-06 广东西电动力科技股份有限公司 Three-phase load balancer of small-power set
CN102055202B (en) * 2011-01-21 2012-12-12 浙江浙大网新能源技术有限公司 Three-phase balancing power-supply energy-saving control management system
CN102055202A (en) * 2011-01-21 2011-05-11 浙江浙大网新能源技术有限公司 Three-phase balancing power-supply energy-saving control management system
CN103138292A (en) * 2011-11-28 2013-06-05 施耐德电器工业公司 Method and system for dynamic management of electricity distribution grid
CN102832632B (en) * 2012-09-14 2014-10-08 重庆大学 Controllable interphase power transfer method and system
CN102832632A (en) * 2012-09-14 2012-12-19 重庆大学 Controllable interphase power transfer method and system
CN103490382A (en) * 2013-09-09 2014-01-01 南京南瑞太阳能科技有限公司 Grid connection safety device and control method for distributed photovoltaic power generation system
CN104198853A (en) * 2014-08-27 2014-12-10 江苏科技大学 Wind power grid integration testing device and testing method
CN106159984A (en) * 2016-08-12 2016-11-23 广州德昊电力科技有限公司 A kind of alternate transfer system of three phase network energy
CN107221942A (en) * 2016-11-18 2017-09-29 都书言 A kind of multinomial energy transfer device and its control method

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