CN102074961B - Leveled controllable parallel reactor device configured by series public reactor - Google Patents
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- CN102074961B CN102074961B CN201010614377.8A CN201010614377A CN102074961B CN 102074961 B CN102074961 B CN 102074961B CN 201010614377 A CN201010614377 A CN 201010614377A CN 102074961 B CN102074961 B CN 102074961B
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Abstract
The invention discloses a leveled controllable parallel reactor device configured by a series public reactor. The body of the device has a transformer structure, and the form of a high short-circuited impedance structure or the form of a normal transformer external reactor can be adopted according to requirements. Three phases on the high voltage side winding of the device are connected to form a Y shape. Three phases on the low voltage side winding of the device have completely same structures; the auxiliary reactors of the phases on the low voltage side are connected in series between the head end and the tail end of the winding on the low voltage side respectively; the head ends of a valve bank in every capability level and a bypass breaker in every capability level are connected with the head end of every auxiliary reactor respectively; the tail end of the valve bank in every capability level is grounded; and the tail end of the bypass breaker in every capability level is short-circuited and grounded by the series public reactor. When the device is stably operated in the certain capability level, the breaker bears long-term operation current, and a thyristor valve is not required to be operated for a long time. Due to the voltage dividing action of the auxiliary reactor and the series public reactor, the capability is regulated in a thyristor valve current zero-crossing switching mode, and the breaker does not need switching current.
Description
Technical field
The invention belongs to power system reactive power compensation field, relate in particular to a kind of stagewise controlled parallel reactor device that adopts the public reactor configuration of series connection.
Background technology
According to national Renewable Energy Development planning, the Jiang Yan west of a river, the Northwest Corridor Building ten million multikilowatt wind-powered electricity generation base, it is away from load center, and in the grid-connected situation of large-scale wind power, the high-efficiency and economic of wind-powered electricity generation is sent the two large technical barriers that become restriction the Northwest Wind Power Development with the safe and stable operation of electrical network.Wind power generation has the feature of intermittence, fluctuation and randomness.Output of wind electric field changes greatly, wind power fluctuation makes on the 750kV passway for transmitting electricity of northwest reactive power fluctuation frequent, reactive power/voltage control difficulty has also caused Voltage-stabilizing Problems, has increased the difficulty of Northwest Grid management and running, and over-voltage and reactive power compensation are particularly thorny.
The huge capacitive charge power of UHV transmission line, violent power flow changing and limited insulation margin have proposed higher requirement to idle adjusting, the Overvoltage suppressing of system, exist contradiction between over-voltage and idle adjusting to be difficult to the problem of coordinating.
Controllable parallel reactors is as the effective means that improves system regulation flexibility, 750kV wind-powered electricity generation be can effectively solve and passage and UHV transmission line reactive power compensation and voltage-controlled problem sent, improve voltage stability level and transient state operational limit, reduce circuit transport loss, balance reactive power distribution, and can effectively alleviate the pressure of management and running, be the important tool that realizes 750kV and the operation of UHV transmission passage high-efficiency and economic.
Controllable parallel reactors mainly comprises controllable magnetic control shunt reactor (Magnetically Controlled Shunt Reactor, MCSR), stagewise controllable parallel reactors (Stepped Controlled Shunt Reactor, SCSR) and three kinds of versions of thyristor control transformer (Thyristor Controlled Transformer, TCT) type controllable parallel reactors.Wherein, stagewise controllable parallel reactors has the plurality of advantages such as control mode is simple, governing response speed is fast, security of operation is stable.
At present, in China 750kV transmission system and system for ultra-high voltage transmission, also do not have controlled parallel reactor device to come into operation.The stagewise controlled parallel reactor device of the public reactor configuration of series connection that does not also have the present invention to propose both at home and abroad drops into the application of superhigh pressure/extra-high voltage grid.
Summary of the invention
The object of the invention is: a kind of controlled parallel reactor device that adopts the public reactor configuration of series connection is provided, solve China 750kV wind-powered electricity generation and send the contradiction between passage and UHV transmission line reactive power compensation and over-voltage, improve voltage stability level and transient state operational limit, reduce circuit transport loss, balance reactive power distribution, alleviate the pressure of management and running, and coordinate neutral reactor restriction secondary arc current.And circuit breaker does not need to cut-off inductance current, extended the service life of circuit breaker.
The connect controlled parallel reactor device of public reactance configurations of the employing that the present invention has provided a kind of 750kV of being applicable to and ultra high voltage system, its body adopts transformer device structure, can adopt according to demand high short-circuit impedance form, by strengthening the leakage reactance of transformer, transformer and reactor are closed in one, or adopt the common transformer form of external reactor again.Three-phase high-voltage side winding is connected into " Y " type, directly receives on high-voltage fence, and neutral point short circuit is by reactor ground connection.Three-phase low-voltage side winding head end is drawn through sleeve pipe respectively, and the direct ground connection of low-pressure side winding end configures thyristor valve, auxiliary reactor, circuit breaker and the public reactor of series connection on low pressure winding.The auxiliary reactor of each phase is connected respectively, is connected between the first and end of low-pressure side winding; Each capacity step valve group, each capacity level bypass breaker head end are connected with each auxiliary reactor head end respectively, each capacity step valve group end ground connection, and each capacity level bypass breaker end short circuit is by public series reactor ground connection.
The stagewise controllable parallel reactors that adopts the public reactor of series connection to configure works in respectively the different brackets of rated capacity, realizes the required idle compensation of primary system.The dividing potential drop of auxiliary reactor and public series reactor is got energy and turning-on voltage for corresponding thyristor valve provides, and the handoff procedure of capacity is realized by thyristor valve current over-zero switching completely.When capacity switches from small to large, due to the dividing potential drop effect of auxiliary reactor, thyristor valve is in current zero-crossing point triggering and conducting, and to system, without impact, breaker closing is born long-term work electric current subsequently; When capacity switches from big to small, due to the effect of public series reactance, thyristor meet get can voltage conditions can conducting work, current transfer, to thyristor, by thyristor drop-out current, circuit breaker is machinery folding, effectively extends circuit breaker useful life.When various faults occur, this controllable parallel reactors can be adjusted to 100% capacity fast, reaches restriction power-frequency overvoltage, suppresses the object of secondary arc current, is specially adapted to operational mode and frequently regulates 750kV electrical network and system for ultra-high voltage transmission.
A kind of stagewise controlled parallel reactor device that adopts the public reactor configuration of series connection that the present invention proposes, controllable parallel reactors body adopts transformer device structure, adopt high short-circuit impedance version to form, by strengthening the leakage reactance of transformer, transformer and reactor are closed in one formation, or adopt the external reactor form of common transformer.
Controlled parallel reactor device of the present invention, comprise controllable parallel reactors body, auxiliary reactor, public series reactor, thyristor valve group and bypass breaker, the high-pressure side winding three-phase of wherein said controllable parallel reactors is connected into " Y " type, directly receive on high-voltage fence, the neutral point short circuit of high-pressure side winding is by reactor ground connection; The low-pressure side three-phase structure of described controllable parallel reactors is identical, and three-phase low-voltage side winding head end is drawn through sleeve pipe respectively, the direct ground connection of low-pressure side winding end; The auxiliary reactor of each phase is connected respectively, is connected between the first and end of low-pressure side winding; The valve group of each capacity level, the bypass breaker head end of each capacity level are connected with each auxiliary reactor head end respectively, each capacity step valve group end ground connection, and each capacity level bypass breaker end short circuit is by public series reactor ground connection.
Wherein, by bypass breaker, bear long-time running electric current, thyristor valve short-term operation, capacity regulating adopts the mode of thyristor valve current over-zero switching; Due to the dividing potential drop effect of auxiliary reactor and the public reactor of series connection, for respective thyristor valve provides, to get energy and turning-on voltage, thereby make capacity classification adjustment process rely on the mode of thyristor valve current over-zero switching to complete completely, circuit breaker does not need folding electric current; When a certain capacity level steady operation, by circuit breaker, bear long-time running electric current, thyristor valve does not need to work long hours; When system generation transient fault, control corresponding thyristor valve or close circuit breaker make output reach rapidly maximum output capacity, effectively suppress power-frequency overvoltage and switching overvoltage.
The invention has the beneficial effects as follows:
1. adopt the stagewise controllable parallel reactors of the public reactance configurations of series connection, regulative mode is simple, fast response time, and maintenance is convenient, can effectively solve the contradiction between over-voltage and reactive power compensation, and coordinates neutral reactor restriction secondary arc current;
2. the dividing potential drop of auxiliary reactor and public series reactor is got energy and turning-on voltage for corresponding thyristor valve provides, the handoff procedure of capacity is realized by thyristor valve current over-zero switching completely, circuit breaker does not need drop-out current, extended circuit breaker service life, to system, can not impact, and avoid the problem fallen of capacity of moment in classification adjustment process;
3. by circuit breaker, bear long-time running electric current, thyristor valve short-term operation, can adopt the cooling mode of air natural, effectively reduces cost, has reduced maintenance workload.
The novelty of technology:
Northwest 750kV wind-powered electricity generation Transmission Corridor and 1000kV system for ultra-high voltage transmission have that electric pressure is high, charge idle large, over-voltage and the problem such as reactive power compensation is particularly thorny, reactive power/voltage control difficulty is large, also do not have at present controlled parallel reactor device to come into operation.The connect controlled parallel reactor device of public reactance configurations of employing provided by the invention is applicable to reactive voltage fluctuate 750kV wind-powered electricity generation Transmission Corridor and 1000kV transmission system frequently.In addition, in extra-high voltage transmission (500kV and 330kV transmission system), do not have at present the connect stagewise controlled parallel reactor device of public reactance configurations of employing provided by the invention to drop into application yet.
The creativeness of technology:
(1) the connect stagewise controlled parallel reactor device body of public reactance configurations of the employing proposing adopts transformer device structure, can be designed to according to demand the external reactor form of high short-circuit impedance form or common transformer.Adopt the configuration of the public reactor of series connection, the dividing potential drop of auxiliary reactor and public series reactor is got energy and turning-on voltage for corresponding thyristor valve provides, the handoff procedure of capacity is realized by thyristor valve current over-zero switching completely, avoid employing circuit breaker to cut-off inductance current, effectively extended circuit breaker service life.The controllable parallel reactors of home and abroad input engineering application at present does not adopt this kind of version.
(2) put into operation with current home and abroad unique 1 stagewise controllable parallel reactors---Xinzhou 500kV stagewise controlled parallel reactor device is compared: the employing proposing is connected the stagewise controlled parallel reactor device of public reactance configurations when capacity classification regulates, because the dividing potential drop of the public reactor of series connection is got energy and turning-on voltage for thyristor valve provides, therefore can turn on and off electric current by thyristor valve current over-zero switching, circuit breaker does not need folding electric current, extend circuit breaker service life, and avoided the problem fallen of capacity of moment in classification adjustment process.
The practicality of technology:
(1) the connect stagewise controlled parallel reactor device of public reactance configurations of the employing proposing, adopts the configuration of the public reactor of series connection that the handoff procedure of capacity is realized by thyristor valve current over-zero switching completely:
1. when capacity switches from small to large, thyristor valve is taked the mode of operating passing zero, to system without impact.After thyristor valve conducting, breaker closing is born long-term work electric current, and thyristor valve short-term operation can adopt the cooling mode of air natural, effectively reduces cost, has reduced maintenance workload;
2. when capacity switches from big to small, due to the dividing potential drop effect of the public reactor of connecting, thyristor valve base electronic unit (VBE) meets gets energy requirement, can guarantee the conducting of valve triggered as normal.The mode of switching by thyristor valve zero passage, has avoided circuit breaker to cut-off inductance current, has effectively extended circuit breaker service life;
(2) northwest 750kV passway for transmitting electricity and system for ultra-high voltage transmission reactive power fluctuation are frequent, and reactive power/voltage control difficulty, requires very high to the adjusting frequency of controllable parallel reactors.The connect stagewise controlled parallel reactor device of public reactance configurations of the employing proposing, is suitable for frequent adjusting, is specially adapted to northwest 750kV passway for transmitting electricity and system for ultra-high voltage transmission, has good Practical prospect.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is the schematic diagram that adopts a kind of typical wiring of stagewise controlled parallel reactor device of the public reactor configuration of series connection.
Embodiment
Adopt the stagewise controlled parallel reactor device body of the public reactor configuration of series connection to adopt transformer device structure, specifically can adopt according to demand high short-circuit impedance version to form, by strengthening the leakage reactance of transformer, transformer and reactor are closed in one formation, or the external reactor form of common transformer.There are two kinds of working methods of bus controllable parallel reactors and circuit controllable parallel reactors, can under steady state situations and under transient state situation, realize the adjusting of reactive capability.
The classification of capacity regulates the mode that adopts thyristor valve current over-zero switching, can divide multistagely, according to minute progression, determines thyristor valve quantity.It is example that Fig. 1 be take decile 4 level capacities (25%, 50%, 75%, 100%4 capacity level), the three-phase main wiring diagram while showing decile 4 level capacity.Concrete form comprises transformer type principal reactance device and auxiliary reactor, and high-pressure side winding three-phase is connected into " Y " type, directly receives on high-voltage fence, and neutral point short circuit is by little reactance grounded.Low-pressure side three-phase structure is identical, and low-pressure side winding head end is drawn through sleeve pipe respectively, and the direct ground connection of low-pressure side winding end configures thyristor valve, auxiliary reactor, circuit breaker and the public reactor of series connection on low pressure winding.The auxiliary reactor of each phase is connected respectively, is connected between the first and end of low-pressure side winding; Each capacity step valve group, each capacity level bypass breaker head end are connected respectively at each auxiliary reactor head end, each capacity step valve group end ground connection, and each capacity level bypass breaker end short circuit is by public series reactor ground connection.The b of take in Fig. 1 is mutually as example describes: in parallel with secondary winding after auxiliary reactor Xb1, Xb2, Xb3 series connection, be connected on public point b, y, node between Xb1 and Xb2 is 1b, node between Xb2 and Xb3 is 2b, one end of thyristor valve Tk1, Tk2, Tk3 is connected on respectively b, 1b, 2b is upper, after other end short circuit, is connected on y node; One end of three circuit breakers is connected on respectively b, 1b, 2b is upper, and the public reactor Xb that connects after other end short circuit is connected on y node.
For the adjusting of device reactive capability, adopt the mode of thyristor valve current over-zero switching, can divide multistage, can determine combination switch quantity according to minute progression, take 4 grades operation principle is described as example, device minute 25%, 50%, 75%, 100% 4 grade, the thyristor valve of every phase is Tk1, Tk2, Tk3 (k can be a, b, c).Trigger valve Tk1, SCSR is operated in 100% capacity level; Trigger valve Tk2, SCSR is operated in 75% capacity level; Only trigger Tk3, SCSR is operated in 50% capacity level; Three groups of valves all do not trigger, and SCSR can be operated in 25% capacity level.Installed capacity and thyristor valve group corresponding relation are as shown in table 1.
Table 1 switching volume controlled table
Wherein, *---representing to disconnect zero---represents conducting.
The classification adjustment process of installed capacity realizes by controlling the mode of respective thyristor valve current over-zero switching, and the b of take below specifically sets forth the handoff procedure of capacity mutually as example:
1. when capacity switches from small to large, due to the dividing potential drop of auxiliary reactor act as larger capacity thyristor valve provide get can and turning-on voltage, therefore the classification that thyristor valve can adopt the mode of current over-zero switching to complete capacity regulates, this grade of breaker closing that thyristor valve is corresponding, bears long-time running electric current subsequently;
2. when capacity switches from big to small, the dividing potential drop effect of public reactor, can get energy and turning-on voltage for providing compared with low capacity level thyristor valve.With device in Fig. 1, by 100% capacity level, to 75% capacity level, switch to example, circuit breaker Db1, Db2 and Db3 are in closure state, the dividing potential drop of public reactor Xb act as thyristor valve Tb1 provide get can and turning-on voltage, operating current on Db1 is transferred on Tb1, open subsequently circuit breaker Db1, then locking thyristor valve Tb1, completes shutoff at current zero-crossing point, by closed circuit breaker Db2, bears long-time running electric current;
3. when system breaks down, thyristor valve Tb1 is open-minded, makes controllable parallel reactors reach rapidly 100% output capacity.When there is close-in fault in controllable parallel reactors body high-pressure side, valve base electronic unit (VBE) cannot effectively be got can, corresponding valve group can not trigger open-minded, now can be by closing the mode of bypass breaker Db1, output capacity is adjusted to 100%, effectively suppresses power-frequency overvoltage and switching overvoltage;
4. because device is pure inductive element substantially, the current zero-crossing point that flows through thyristor valve overlaps substantially with thyristor valve both end voltage peak point, therefore can determine by detecting the peak point of thyristor valve both end voltage the zero crossing of electric current.
Adopt the stagewise controlled parallel reactor device regulative mode of the public reactance configurations of series connection simple, transient state governing response speed, the circuit breaker life-span is long, thyristor valve can adopt the air natural type of cooling, cost is little, is applicable to being applied to frequent 750kV and the system for ultra-high voltage transmission regulating of needs controlled reactor capacity.
According to specific exemplary embodiment, invention has been described herein.It will be apparent under not departing from the scope of the present invention, carrying out to one skilled in the art suitable replacement or revise.Exemplary embodiment is only illustrative, rather than the restriction to scope of the present invention, and scope of the present invention is defined by appended claim.
Claims (1)
1. a stagewise controlled parallel reactor device that adopts the configuration of the public reactor of series connection, it is characterized in that controllable parallel reactors body adopts transformer device structure, adopt high short-circuit impedance version to form, by strengthening the leakage reactance of transformer, transformer and reactor are closed in one formation, or adopt the external reactor form of common transformer;
Described controlled parallel reactor device comprises controllable parallel reactors body, auxiliary reactor, public series reactor, thyristor valve group and bypass breaker, the high-pressure side winding three-phase of wherein said controllable parallel reactors is connected into " Y " type, directly receive on high-voltage fence, high-pressure side winding neutral point short circuit is by reactor ground connection; The low-pressure side three-phase structure of described controllable parallel reactors is identical, and three-phase low-voltage side winding head end is drawn through sleeve pipe respectively, the direct ground connection of low-pressure side winding end; The auxiliary reactor of each phase is connected respectively, is connected between the first and end of low-pressure side winding; The valve group of each capacity level, the bypass breaker head end of each capacity level are connected with each auxiliary reactor head end respectively, each capacity step valve group end ground connection, and each capacity level bypass breaker end short circuit is by public series reactor ground connection;
By bypass breaker, bear long-time running electric current, thyristor valve short-term operation, capacity regulating adopts the mode of thyristor valve current over-zero switching; Due to the dividing potential drop effect of auxiliary reactor and the public reactor of series connection, for respective thyristor valve provides, to get energy and turning-on voltage, thereby make capacity classification adjustment process rely on the mode of thyristor valve current over-zero switching to complete completely, circuit breaker does not need folding electric current; When a certain capacity level steady operation, by circuit breaker, bear long-time running electric current, thyristor valve does not need to work long hours; When system generation transient fault, control corresponding thyristor valve or close circuit breaker make output reach rapidly maximum output capacity, effectively suppress power-frequency overvoltage and switching overvoltage.
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| CN102904287B (en) * | 2012-09-27 | 2015-06-10 | 中国电力科学研究院 | Coordination control method for flexible alternate current transmission system (FACTS) devices of new energy delivery system |
| CN103050984A (en) * | 2012-12-24 | 2013-04-17 | 保定天威保变电气股份有限公司 | Controllable parallel reactor |
| CN104319790B (en) * | 2014-11-14 | 2018-01-19 | 国家电网公司 | The pulsation TCT formula controllable parallel reactors of one kind 6 |
| CN113937723B (en) * | 2020-07-14 | 2024-01-02 | 南京南瑞继保工程技术有限公司 | Relay protection system suitable for contain series reactor circuit |
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| JP3513327B2 (en) * | 1996-07-15 | 2004-03-31 | 三菱電機株式会社 | Reactive power compensator |
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