CN103986159B - There is the mounting circuit of THE UPFC in multi transformer station - Google Patents

There is the mounting circuit of THE UPFC in multi transformer station Download PDF

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Publication number
CN103986159B
CN103986159B CN201410224942.8A CN201410224942A CN103986159B CN 103986159 B CN103986159 B CN 103986159B CN 201410224942 A CN201410224942 A CN 201410224942A CN 103986159 B CN103986159 B CN 103986159B
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China
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bus
upfc
section
isolating switch
transformer station
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CN103986159A (en
Inventor
刘建坤
张宁宇
李群
陈静
荆平
周飞
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Smart Grid Research Institute of SGCC
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Smart Grid Research Institute of SGCC
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Abstract

The invention discloses a kind of mounting circuit with THE UPFC in multi transformer station, be mainly used in the transformer station with many circuits inner, comprise some substation line, transformer station's positive bus-bar, the secondary bus of transformer station, THE UPFC UPFC, UPFC bus, several circuit breakers and several isolating switches.By changing the closed and disconnected state of isolating switch, make under electrical network normal operation, flow controller can compensate the voltage of any substation line, and controls the trend of this circuit, switches flexibly between different circuit simultaneously; At electrical network in emergency circumstances, flow controller can carry out power flowcontrol to the independent loop of any two substation line composition, realizes urgent power flowcontrol function.Present invention achieves the switching controls of single THE UPFC to many Line Flows, not only can reduce investment outlay, improve the economy of operation of power networks, and strengthen THE UPFC flexibility, contribute to the safe and stable operation of electrical network.

Description

There is the mounting circuit of THE UPFC in multi transformer station
Technical field
The present invention relates to a kind of mounting circuit with THE UPFC in multi transformer station, belong to power grid control technical field.
Background technology
Before the application of flexible AC transmitting system (FACTS) technology, electrical network adopts traditional mechanical type control method, have response speed slow, can not the limitation such as frequent movement, controlling functions be discrete, substantially steady-state load flow or voltage control is only applicable to, enough control abilities are lacked to transient state and dynamic stability, therefore generally leave larger stability margin during system cloud gray model, be difficult to the ability to transmit electricity making full use of power equipment.
THE UPFC (UPFC) is flexible AC transmission of new generation (FACTS) device that a kind of function is the most powerful, characteristic is superior, it is the FACTS device that versatility is best up to now, combine the multiple flexible control device of FACTS element, by means of only the change of control law, just all functions such as voltage-regulation, series compensation and phase shift can be realized respectively or simultaneously.UPFC device can be regarded as Static Synchronous (STATCOM) device and Static Series Synchronous Compensator (SSSC) device is formed at DC side parallel, it can simultaneously and fast, independently control active power in transmission line and reactive power, thus the four quadrant running function making UPFC have STATCOM, SSSC device not possess.UPFC can the trend distribution of effective control circuit, improves the stability of electric power system.
But UPFC is arranged on a fixing circuit usually, can only to flowing through the meritorious of this circuit and reactive power controls.When needing in power system operation to carry out power flowcontrol to many circuits, the UPFC of respective numbers need be installed, add investment cost and operating cost.
Summary of the invention
The deficiency of mounting means is controlled for existing Unified Power Flow, the invention provides a kind of mounting circuit with THE UPFC in multi transformer station, be mainly used in the transformer station with many circuits inner, achieve single UPFC carries out power flowcontrol function to many circuits, effectively reduce operating cost and improve the stable of operation of power networks.
For achieving the above object, the technical solution adopted in the present invention is:
There is the mounting circuit of THE UPFC in multi transformer station, comprise some substation line, transformer station's positive bus-bar, the secondary bus of transformer station, THE UPFC UPFC, UPFC bus, several circuit breakers and several isolating switches; Described transformer station positive bus-bar is divided into I section and II section, and centre is connected by isolating switch; The secondary bus of described transformer station is divided into III section and IV section, and centre is connected by isolating switch; Connected by bus connection switch between I section of described transformer station positive bus-bar and III section of the secondary bus of transformer station; Every bar circuit of described transformer station connects isolating switch and circuit breaker successively, then be connected by with transformer station positive bus-bar I section or II section of isolating switch, III section or IV section by the secondary bus of another isolating switch and transformer station is connected, is connected by an isolating switch and UPFC bus V section or VI section; Described UPFC bus is divided into V section of bus and VI section of bus, and the side of described V section of bus is connected with the end of incoming cables of THE UPFC by circuit breaker; The side of described VI section of bus is connected with the leading-out terminal of THE UPFC by circuit breaker, the opposite side of described VI section of bus and II section of bus of transformer station's positive bus-bar, is all connected by isolating switch between IV section of the secondary bus of transformer station.
Aforesaid THE UPFC comprises transmission line, transformer 1 and transformer 2, current transformer 1 and current transformer 2, isolating switch 1 and isolating switch 2, electric capacity and control system; Described isolating switch 1 is installed between transmission line and transformer 1; Described isolating switch 2 is installed between transformer 2 and current transformer 2; Described current transformer 1 is connected by electric capacity with the DC side of current transformer 2; The AC connection control system of described current transformer 1 and current transformer 2.
Can only fix with existing single UPFC carries out compared with power flowcontrol to a circuit, and the beneficial effect that the present invention reaches is:
(1) when electrical network normally runs, by the compounding practice between UPFC bus, substation bus bar and multiple circuit breaker, isolating switch, achieve single UPFC carries out power flowcontrol function to any substation line, and can switch flexibly at different circuit, not only can reduce investment outlay, improve the economy of operation of power networks, and add the flexibility of THE UPFC.
(2) in electrical network emergency situation, by the compounding practice between UPFC bus and relative breaker, isolating switch, make any two circuits composition independent operating loop, and the urgent power flowcontrol in this loop is achieved by UPFC device, improve the stability of electrical network in emergency situation and fail safe.
Accompanying drawing explanation
Fig. 1 is mounting circuit wiring schematic diagram of the present invention;
Fig. 2 is the internal structure schematic diagram of THE UPFC of the present invention;
Concrete winding diagram when Fig. 3 is the trend of THE UPFC control circuit 1 of the present invention;
Fig. 4 is the substation operation schematic diagram in Fig. 3 situation;
Fig. 5 is the concrete winding diagram that THE UPFC of the present invention controls the trend of the independent loop be made up of circuit 1 and circuit 2;
Fig. 6 is the substation operation schematic diagram in Fig. 5 situation.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the mounting circuit with THE UPFC in multi transformer station of the present invention, comprises some substation line, transformer station's positive bus-bar, the secondary bus of transformer station, THE UPFC UPFC, UPFC bus, several circuit breakers and several isolating switches; Wherein UPFC bus is divided into V section of bus and VI section of bus, all isolating switch is housed between UPFC bus and all circuits of transformer station, as in Fig. 1, be connected by isolating switch 201 between circuit 1 and V section of bus of UPFC bus, be connected by isolating switch 202 between circuit 2 and V section of bus of UPFC bus,, be connected by isolating switch 20M between circuit M and VI section of bus of UPFC bus.The side of V section of bus is connected with the end of incoming cables of THE UPFC by circuit breaker 1; The side of VI section of bus is connected with the leading-out terminal of THE UPFC by circuit breaker 2.VI section of UPFC bus connects II section of transformer station's positive bus-bar by isolating switch 302, connected IV section of the secondary bus of transformer station by isolating switch 301.
Transformer station of the present invention comprises some circuits, as the circuit 1 in Fig. 1, circuit 2 ..., circuit M, positive bus-bar, secondary bus, several isolating switches, as the isolating switch L in Fig. 1 101, isolating switch L 102, isolating switch L 103 ..., isolating switch L m01, isolating switch L m02, isolating switch L m03, several circuit breakers, as the circuit breaker L in Fig. 1 1, circuit breaker L 2..., circuit breaker L m.Transformer station's positive bus-bar is divided into I section and II section, and centre is connected by isolating switch 401; The secondary bus of transformer station is divided into III section and IV section, and centre is connected by isolating switch 402; Connected by bus connection switch 4 between I section of positive bus-bar, III section of secondary bus; Every bar circuit of transformer station connects isolating switch and circuit breaker successively, then be connected by with positive bus-bar I section or II section of isolating switch, be connected by with secondary bus III section or IV section of another isolating switch, be connected by with UPFC bus V section or VI section of an isolating switch; Substation has circuit all can be external in identical or different bus.For circuit 1, circuit 1 connects isolating switch L successively 101, circuit breaker L 1, then by isolating switch L 102 is connected, by isolating switch L with I section of positive bus-bar 103 is connected with III section of secondary bus, and be connected by with UPFC bus V section of isolating switch 201, connected mode and the circuit 1 of all the other circuits are similar.
As shown in Figure 2, THE UPFC of the present invention comprises transmission line, transformer 1 and transformer 2, current transformer 1 and current transformer 2, isolating switch 1 and isolating switch 2, electric capacity and control system; Wherein isolating switch 1 is installed between transmission line and transformer 1; Isolating switch 2 is installed between transformer 2 and current transformer 2; Current transformer 1 is connected by electric capacity with the DC side of current transformer 2; The AC connection control system of current transformer 1 and current transformer 2.Whole THE UPFC is equivalent to STATCOM (STATCOM) and Static Series Synchronous Compensator (SSSC) DC bus capacitor connects and composes.
As shown in Figure 3, for THE UPFC of the present invention is for winding diagram during control circuit 1 trend.Circuit 1 connects isolating switch L successively 101, circuit breaker L 1, be then connected by V section of isolating switch 201 and UPFC bus, isolating switch 201 is in closure state, by isolating switch L 102 is connected, by isolating switch L with transformer station positive bus-bar I section 103 is connected with transformer station secondary bus III section, isolating switch L 102 and isolating switch L 103 is in off-state.Circuit 2 connects isolating switch L successively 201, circuit breaker L 2, be then connected by V section of isolating switch 202 and UPFC bus, isolating switch 202 is in off-state, by isolating switch L 202 is connected, by isolating switch L with transformer station positive bus-bar I section 203 is connected with transformer station secondary bus III section, isolating switch L 202 is in closure state, isolating switch L 203 is in off-state.All the other connections modes and circuit 2 similar, the isolating switch being connected to positive bus-bar is all in closure state, and the isolating switch being connected to secondary bus and UPFC bus is all in off-state.Isolating switch L 101, L 201 ..., L m01 is all in closure state.Isolating switch 302 between UPFC bus VI section and positive bus-bar II section is in closure state, isolating switch 301 between UPFC bus VI section and secondary bus IV section is in off-state, isolating switch 401 between transformer station's positive bus-bar I section and II section is in closure state, and the isolating switch 402 between the secondary bus III section and IV section of transformer station is in off-state.THE UPFC internal isolating switch 1 and isolating switch 2 are all in closure state.In this circuit connection situation, THE UPFC realizes the power flowcontrol to circuit 1.
When Fig. 4 representatively illustrates THE UPFC for control circuit 1, the operation schematic diagram of transformer station.
As shown in Figure 5, when electrical network generation emergency, THE UPFC is for controlling the concrete winding diagram during independent loop trend of any two circuits composition.For the separate lines trend that control circuit 1 and 2 forms, circuit 1 connects isolating switch L successively 101, circuit breaker L 1, be then connected by V section of isolating switch 201 and UPFC bus, isolating switch 201 is in closure state, by isolating switch L 102 is connected, by isolating switch L with transformer station positive bus-bar I section 103 is connected with transformer station secondary bus III section, isolating switch L 102 and isolating switch L 103 is in off-state.Circuit 2 connects isolating switch L successively 201, circuit breaker L 2, be then connected by V section of isolating switch 202 and UPFC bus, isolating switch 202 is in off-state, by isolating switch L 202 is connected, by isolating switch L with transformer station positive bus-bar I section 203 is connected with transformer station secondary bus III section, isolating switch L 202 is in closure state, isolating switch L 203 is in off-state.Circuit M connects isolating switch L successively m01, circuit breaker L m, be then connected with VI section of UPFC bus by isolating switch 20M, isolating switch 20M is in off-state, by isolating switch L m02 is connected, by isolating switch L with II section of transformer station positive bus-bar m03 is connected with transformer station secondary bus IV section, isolating switch L m02 is in off-state, isolating switch L m03 is in closure state.All the other connections modes and circuit M similar, the isolating switch being connected to secondary bus is all in closure state, and the isolating switch being connected to positive bus-bar and UPFC bus is all in off-state.Isolating switch L 101, L 201 ..., L m01 is all in closure state.Isolating switch 302 between UPFC bus VI section and positive bus-bar II section is in closure state, isolating switch 301 between UPFC bus VI section and secondary bus IV section is in off-state, isolating switch 401 between transformer station's positive bus-bar I section and II section is in closure state, and the isolating switch 402 between the secondary bus III section and IV section of transformer station is in off-state.THE UPFC internal isolating switch 1 and isolating switch 2 are all in closure state.In this circuit connection situation, THE UPFC realizes the control to the independent loop trend that circuit 1 and 2 forms.
Fig. 6 schematically to showing when electrical network generation emergency, when THE UPFC carries out power flowcontrol to the independent loop that circuit 1 and 2 forms, the operation schematic diagram of transformer station.

Claims (2)

1. there is the mounting circuit of THE UPFC in multi transformer station, it is characterized in that, comprise some substation line, transformer station's positive bus-bar, transformer station secondary bus, THE UPFC UPFC, UPFC bus, several circuit breakers and several isolating switches; Described transformer station positive bus-bar is divided into I section and II section, and centre is connected by isolating switch; The secondary bus of described transformer station is divided into III section and IV section, and centre is connected by isolating switch; Connected by bus connection switch between I section of described transformer station positive bus-bar and III section of the secondary bus of transformer station; Every bar circuit of described transformer station connects isolating switch and circuit breaker successively, then be connected by with transformer station positive bus-bar I section or II section of isolating switch, III section or IV section by the secondary bus of another isolating switch and transformer station is connected, is connected by an isolating switch and UPFC bus V section or VI section; Described UPFC bus is divided into V section of bus and VI section of bus, and the side of described V section of bus is connected with the end of incoming cables of THE UPFC by circuit breaker; The side of described VI section of bus is connected with the leading-out terminal of THE UPFC by circuit breaker, the opposite side of described VI section of bus and II section of bus of transformer station's positive bus-bar, is all connected by isolating switch between IV section of the secondary bus of transformer station.
2. the mounting circuit with THE UPFC in multi transformer station according to claim 1, it is characterized in that, described THE UPFC comprises transmission line, transformer 1 and transformer 2, current transformer 1 and current transformer 2, isolating switch 1 and isolating switch 2, electric capacity and control system; Described isolating switch 1 is installed between transmission line and transformer 1; Described isolating switch 2 is installed between transformer 2 and current transformer 2; Described current transformer 1 is connected by electric capacity with the DC side of current transformer 2; The AC connection control system of described current transformer 1 and current transformer 2.
CN201410224942.8A 2014-05-26 2014-05-26 There is the mounting circuit of THE UPFC in multi transformer station Active CN103986159B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105048449B (en) * 2015-06-05 2017-03-29 国家电网公司 THE UPFC control setting method based on power flow transfer distribution factor
US10153640B2 (en) 2016-11-30 2018-12-11 State Grid Jiangsu Electric Power Research Institute Unified power flow controller and control method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101014918A (en) * 2004-06-29 2007-08-08 伦塞勒理工学院 Power flow controller responsive to power circulation demand for optimizing power transfer
JP2008252999A (en) * 2007-03-29 2008-10-16 Chubu Electric Power Co Inc Line loss reducing apparatus of power system, power system and method for configuring power system
CN102969708A (en) * 2012-07-13 2013-03-13 中电普瑞科技有限公司 Interline power flow controller based on modular multi-level converter structure
CN102983577A (en) * 2012-07-13 2013-03-20 中电普瑞科技有限公司 Convertible static compensator provided with modular multilevel converter structure
CN203850833U (en) * 2014-05-26 2014-09-24 国家电网公司 Unified power flow controller installation circuit in transformer station with multiple lines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101014918A (en) * 2004-06-29 2007-08-08 伦塞勒理工学院 Power flow controller responsive to power circulation demand for optimizing power transfer
JP2008252999A (en) * 2007-03-29 2008-10-16 Chubu Electric Power Co Inc Line loss reducing apparatus of power system, power system and method for configuring power system
CN102969708A (en) * 2012-07-13 2013-03-13 中电普瑞科技有限公司 Interline power flow controller based on modular multi-level converter structure
CN102983577A (en) * 2012-07-13 2013-03-20 中电普瑞科技有限公司 Convertible static compensator provided with modular multilevel converter structure
CN203850833U (en) * 2014-05-26 2014-09-24 国家电网公司 Unified power flow controller installation circuit in transformer station with multiple lines

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