CN102074958B - Thyristor valve controlled type controllable paralleling reactor device configured with parallel valve branches - Google Patents
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Abstract
The invention belongs to the reactive compensation field of power system, and provides a thyristor valve controlled type controllable paralleling reactor device configured with parallel valve branches. A controllable paralleling reactor body uses a transformer structure to be designed into a form of high short-circuit impedance or a form of a common transformer external reactor according to requirements. Three phases of the windings at a high voltage side of the controllable reactor are connected to be Y-shaped; a three-phase low voltage side has the same structure; each thyristor valve set is serially connected to a corresponding volume configuration reactor to form the valve branches of which each one is connected in parallel and configured between head and tail ends at the low voltage side; and a breaker is serially connected to a breaker serially connected reactor and connected between the head and tail ends of the low voltage side. When the manner of thyristor valve current zero-cross switching is used, the volume classification adjustment procedure is completed by the manner of thyristor valve current zero-cross switching; when the manner of thyristor valve phase control is used, the fast and smooth adjustment of the output reactive power is realized by controlling a conduction angle of the thyristor.
Description
Technical field
The invention belongs to power system reactive power compensation field, relate in particular to a kind of thyristor valve-controlled controlled shunt reactor device that adopts the configuration of valve branch circuit parallel connection type.
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.
In ， China 750kV transmission system and system for ultra-high voltage transmission, also do not have controlled parallel reactor device to come into operation at present.Also the thyristor valve-controlled controlled shunt reactor device that the employing valve branch circuit parallel connection type that does not have the present invention to propose both at home and abroad configures drops into the application of superhigh pressure/extra-high voltage grid.
Summary of the invention
The object of the invention is: a kind of thyristor valve-controlled controlled shunt reactor device that adopts the configuration of valve branch circuit parallel connection type 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.
A kind of thyristor valve-controlled controlled shunt reactor device that adopts the configuration of valve branch circuit parallel connection type of the present invention, the body of controllable parallel reactors 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 common transformer form formation of external reactor again.
It comprises thyristor valve, capacity configuration reactor, circuit breaker and the circuit breaker series reactor of the low-pressure side installing of controllable parallel reactors body, controllable parallel reactors body; Described controllable parallel reactors high-pressure side winding three-phase is connected into " Y " type, directly receives on high voltage network, and neutral point short circuit is by reactor ground connection; Three-phase low-voltage side structure is identical, and each phase winding head end is drawn through sleeve pipe respectively, the direct ground connection of low-pressure side winding end; Each thyristor valve group and corresponding capacity configuration reactor valve branch road in series, each valve branch circuit parallel connection connects, and is disposed between the first and end of low-pressure side; Circuit breaker and circuit breaker series reactor are in series, and are connected between the first and end of low-pressure side.
Wherein, adopt the thyristor valve controlled type controllable parallel reactors of valve branch circuit parallel connection type configuration, its reactive capability regulates the mode that adopts thyristor valve current over-zero switching or phase control.
Wherein, when described controllable parallel reactors adopts thyristor valve current over-zero switching mode, dividing potential drop effect due to capacity configuration reactor, for providing, respective thyristor valve gets 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, to system without impact; When system generation transient fault, control corresponding thyristor valve or close bypass breaker make output reach rapidly maximum output capacity, thereby effectively suppress power-frequency overvoltage and switching overvoltage.
Wherein, when controllable parallel reactors adopts the mode of thyristor valve phase control, due to the dividing potential drop effect of capacity configuration reactor, for providing, respective thyristor valve gets energy and turning-on voltage, by controlling the angle of flow of thyristor valve, realize level and smooth, the quick adjustment of output reactive power; When system generation transient fault, control the angle of flow of thyristor valve or close bypass breaker and make output reach rapidly maximum output capacity, effectively suppress power-frequency overvoltage and switching overvoltage.
The invention has the beneficial effects as follows:
1. the thyristor valve controlled type controllable parallel reactors that adopts the configuration of valve branch circuit parallel connection type, regulative mode is simple, fast response time, maintenance is convenient, can effectively solve the contradiction between over-voltage and reactive power compensation, and coordinates neutral reactor restriction secondary arc current;
2. by adopting the classification of the thyristor valve controlled type controllable parallel reactors reactive power of valve branch circuit parallel connection type configuration to export, in capacity handoff procedure, adopt the mode of thyristor valve current over-zero switching or phase control to turn on and off electric current, 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 adjustment process.
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 thyristor valve-controlled controlled shunt reactor device of employing valve branch circuit parallel connection type provided by the invention configuration 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 thyristor valve-controlled controlled shunt reactor device of employing valve branch circuit parallel connection type configuration provided by the invention to drop into application yet.
The creativeness of technology:
(1) the thyristor valve-controlled controlled shunt reactor device body of the employing valve branch circuit parallel connection type configuration 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, by controlling thyristor valve, coordinate with body short impedance phase the grading control that realizes reactive capability.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 thyristor valve-controlled controlled shunt reactor device of the employing valve branch circuit parallel connection type configuration proposing is when capacity classification regulates, by shunt reactor for thyristor valve provide get can and turning-on voltage, avoided the problem fallen of capacity of moment in classification adjustment process.
The practicality of technology:
(1) thyristor valve-controlled controlled shunt reactor device proposing, coordinates and realizes idle output and adjusting with body short impedance phase by controlling thyristor valve.According to the different demands of reactive power compensation, the control mode of thyristor valve can adopt current over-zero switching or phase control:
1. when adopting thyristor valve current over-zero switching mode, capacity classification adjustment process relies on thyristor valve current over-zero switching to complete completely, fast response time, to system without impact;
2. when adopting thyristor valve phase control mode, by controlling the angle of flow of thyristor valve, realize quick, the smooth adjustment of output reactive power.
(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 thyristor valve-controlled controlled shunt reactor device 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 thyristor valve-controlled controlled shunt reactor device main wiring diagram that adopts the configuration of valve branch circuit parallel connection type.
Embodiment
Adopt the thyristor valve controlled type controllable parallel reactors of valve branch circuit parallel connection type configuration to can be used as circuit controllable parallel reactors and two kinds of working methods of bus controllable parallel reactors.During as circuit controllable parallel reactors, can absorb the capacitive charge power of transmission line, restriction power-frequency overvoltage and switching overvoltage, suppress secondary arc current, improves circuit conveying capacity and the stability of a system; During as bus controllable parallel reactors, idle by regulation output, guarantee the stable of busbar voltage.
Fig. 1 shows a kind of typical key wiring diagram of thyristor valve-controlled controlled shunt reactor device, thyristor valve controlled type controllable parallel reactors body adopts transformer device structure, 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 is connected thyristor valve, capacity configuration reactor, circuit breaker and circuit breaker series reactor between low pressure winding head end and end.
According to the demand of System Reactive Power compensation, for the adjusting of installed capacity, can adopt the mode of thyristor valve operating passing zero or phase control to realize.For thyristor valve, adopt current over-zero switching and two kinds of different modes of phase control to set forth respectively the corresponding course of work below.
(1) thyristor valve adopts current over-zero switching mode
The classification of installed 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 principle wiring while showing decile 4 level capacity.For setting forth conveniently, take the b shown in Fig. 1 mutually as example illustrates operation principle, a, c two-phase operation principle are mutually identical with b.B end is controlled reactor low-pressure side head end, y end controlled reactor low-pressure side end.Xb1, Xb2, Xb3, Xb4 are capacity configuration reactor; Tb1, Tb2, Tb3 are respectively 100% capacity level thyristor valve group, 75% capacity level thyristor valve group, 50% capacity level thyristor valve group.Xb4 is shunt reactor, in parallel with secondary winding, and two ends are connected on b and y.Bypass breaker Db series reactor Xb11, it is upper that these branch road two ends are connected on b and y, and the reactance value that simultaneously needs to design Xb11 is identical with Xb1.
In course of normal operation, when thyristor valve Tb1 conducting, control thyristor valve Tb2, Tb3 locking, device runs on 100% capacity level; When thyristor valve Tb2 conducting, control thyristor valve Tb1, Tb3 locking, device runs on 75% capacity level; When thyristor valve Tb3 conducting, control thyristor valve Tb1, Tb2 locking, device runs on 50% capacity level; When thyristor valve Tb1, Tb2, the whole locking of Tb3, device runs on 25% capacity level.Installed capacity and thyristor valve control 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 lower mask body is set forth the handoff procedure of capacity:
1. when capacity switches from small to large, due to the dividing potential drop of capacity configuration reactor act as larger capacity thyristor valve provide get can and turning-on voltage, so the classification that thyristor valve can adopt the mode of current over-zero switching to complete capacity regulates;
2. when capacity switches from big to small, the dividing potential drop effect of capacity configuration reactor, can get energy and turning-on voltage for providing compared with low capacity level thyristor valve.To install b in Fig. 1, by 100% capacity level, to 75% capacity level, switch to example, shunt reactor Xb4 gets energy and turning-on voltage for thyristor valve Tb2 provides, conducting Tb2 when electric current is zero, locking Tb1, thus make handoff procedure rely on the mode of thyristor valve current over-zero switching to complete completely;
3. when system breaks down, open thyristor valve Tb1, make 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 Db, 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.
(2) thyristor valve adopts phase control mode
Mode when thyristor valve employing phase control, dividing potential drop effect due to auxiliary reactor and larger capacity level thyristor valve institute series and parallel reactor, therefore can, by controlling the angle of flow of thyristor valve Tk1, Tk2, Tk3 (k is a, b, c), realize controllable parallel reactors output idle continuous, smooth adjustment; When system breaks down, control the Trigger Angle of corresponding thyristor valve, make 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 Dk (k is a, b, c), output capacity is adjusted to 100%, effectively suppresses power-frequency overvoltage and switching overvoltage.
Adopt the thyristor valve controlled type controllable parallel reactors of valve branch circuit parallel connection type configuration, its whole steady-state adjustment process does not have circuit breaker to participate in, and relies on thyristor valve to complete completely, and frequent adjusting does not affect the useful life of circuit breaker.Transient state is controlled and is realized by thyristor valve or circuit breaker, and response rapidly, can effectively limit power-frequency overvoltage and switching overvoltage, suppresses secondary arc current.
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 (4)
1. a thyristor valve-controlled controlled shunt reactor device that adopts valve branch circuit parallel connection type configuration, the body that it is characterized in that controllable parallel reactors 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, or adopt the common transformer form formation of external reactor again; Described controlled parallel reactor device comprises thyristor valve, capacity configuration reactor, circuit breaker and the circuit breaker series reactor of the low-pressure side installing of controllable parallel reactors body, controllable parallel reactors body; Described controllable parallel reactors high-pressure side winding three-phase 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 structure is identical, and each phase winding head end is drawn through sleeve pipe respectively, the direct ground connection of low-pressure side winding end; Each thyristor valve group and corresponding capacity configuration reactor valve branch road in series, each valve branch circuit parallel connection connects, and is disposed between the first and end of low-pressure side; Circuit breaker and circuit breaker series reactor are in series, and are connected between the first and end of low-pressure side.
2. controlled parallel reactor device as claimed in claim 1, is characterized in that adopting the thyristor valve controlled type controllable parallel reactors of valve branch circuit parallel connection type configuration, and its reactive capability regulates the mode that adopts thyristor valve current over-zero switching or phase control.
3. controlled parallel reactor device as claimed in claim 2, it is characterized in that when described controllable parallel reactors adopts thyristor valve current over-zero switching mode, dividing potential drop effect due to capacity configuration reactor, for providing, respective thyristor valve gets 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, to system without impact; When system generation transient fault, control corresponding thyristor valve or close bypass breaker make output reach rapidly maximum output capacity, thereby effectively suppress power-frequency overvoltage and switching overvoltage.
4. controlled parallel reactor device as claimed in claim 2, it is characterized in that when controllable parallel reactors adopts the mode of thyristor valve phase control, dividing potential drop effect due to capacity configuration reactor, for providing, respective thyristor valve gets energy and turning-on voltage, by controlling the angle of flow of thyristor valve, realize level and smooth, the quick adjustment of output reactive power; When system generation transient fault, control the angle of flow of thyristor valve or close bypass breaker and make output reach rapidly maximum output capacity, effectively suppress power-frequency overvoltage and switching overvoltage.
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| CN104682403B (en) * | 2015-02-09 | 2017-02-22 | 国网浙江省电力公司丽水供电公司 | Intelligent switching device of parallel reactor |
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| CN1738188A (en) * | 2005-09-09 | 2006-02-22 | 西安西电变压器有限责任公司 | AC step controlled parallel reactor device |
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