CN102074961A - Leveled controllable parallel reactor device configured by series public reactor - Google Patents
Leveled controllable parallel reactor device configured by series public reactor Download PDFInfo
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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 the 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 regenerative resource development plan, the Northwest incites somebody to action western corridor construction ten million multikilowatt wind-powered electricity generation base along the river, it is away from load center, and the large-scale wind power high-efficiency and economic of wind-powered electricity generation that is incorporated into the power networks under the situation is sent the two big technical barriers that become the wind-powered electricity generation development of restriction the Northwest with the safe and stable operation of electrical network.Wind power generation has intermittence, fluctuation and randomicity characteristics.Output of wind electric field changes greatly, wind power fluctuation makes on the 750kV passway for transmitting electricity of northwest reactive power fluctuation frequent, the reactive power difficulty has also caused the voltage stable problem, has increased the difficulty of Northwest Grid management and running, and over-voltage and reactive power compensation are particularly thorny.
Huge capacitive charge power, the violent trend of UHV transmission line changes and limited insulation margin suppresses to have proposed higher requirement for idle adjusting, the overvoltage of system, has the problem that contradiction is difficult to coordinate between over-voltage and the idle adjusting.
Controllable parallel reactors is as the effective means that improves the system regulation flexibility, the 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 the circuit transport loss, the idle distribution of balance, 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 thyristor control transformer (Thyristor Controlled Transformer, TCT) three kinds of versions of type controllable parallel reactors.Wherein, the stagewise controllable parallel reactors has 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 there is not controlled parallel reactor device to come into operation.The stagewise controlled parallel reactor device of the public reactor configuration of the series connection that does not also have the present invention to propose both at home and abroad drops into superhigh pressure/extra-high voltage grid and uses.
Summary of the invention
The objective of the invention is: a kind of controlled parallel reactor device that adopts the public reactor configuration of series connection is provided, solution China 750kV wind-powered electricity generation is sent the contradiction between passage and UHV transmission line reactive power compensation and the over-voltage, improve voltage stability level and transient state operational limit, reduce the circuit transport loss, the idle distribution of balance, alleviate the pressure of management and running, and cooperate neutral point reactor restriction secondary arc current.And circuit breaker need not cut-off inductance current, has prolonged 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 high short-circuit impedance form according to demand, promptly 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 the high-voltage fence, and the neutral point short circuit is after reactor ground connection.Three-phase low-pressure side winding head end is drawn through sleeve pipe respectively, and the terminal directly ground connection of low-pressure side winding is disposed thyristor valve, auxiliary reactor, circuit breaker and the public reactor of series connection on the low pressure winding.The auxiliary reactor of each phase is connected respectively, is connected between the head, end of low-pressure side winding; Each capacity step valve group, each capacity level bypass breaker head end link to each other with each auxiliary reactor head end respectively, each capacity step valve group end ground connection, and the terminal short circuit of each capacity level bypass breaker is after public series reactor ground connection.
The stagewise controllable parallel reactors that adopts the public reactor of series connection to dispose works in the different brackets of rated capacity respectively, 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 makes the handoff procedure of capacity realize by thyristor valve current over-zero switching fully.When capacity switched from small to large, because the dividing potential drop effect of auxiliary reactor, thyristor valve did not have impact in the current zero-crossing point triggering and conducting to system, and breaker closing is born the long-term work electric current subsequently; When capacity switches from big to small because the effect of public series reactance, thyristor satisfy get can voltage conditions can conducting work, to thyristor, by the thyristor drop-out current, circuit breaker is a machinery folding current transfer, effectively prolongs circuit breaker useful life.When various faults took place, this controllable parallel reactors can transfer to 100% capacity fast, reaches the restriction power-frequency overvoltage, suppressed the purpose of secondary arc current, was specially adapted to operational mode and frequently regulated 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, the controllable parallel reactors body adopts transformer device structure, adopt high short-circuit impedance version to constitute, promptly by strengthening the leakage reactance of transformer, transformer and reactor are closed in the 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 the high-voltage fence, the neutral point short circuit of high-pressure side winding is after reactor ground connection; The low-pressure side three-phase structure of described controllable parallel reactors is identical, and three-phase low-pressure side winding head end is drawn through sleeve pipe respectively, the terminal directly ground connection of low-pressure side winding; The auxiliary reactor of each phase is connected respectively, is connected between the head, end of low-pressure side winding; The valve group of each capacity level, the bypass breaker head end of each capacity level link to each other with each auxiliary reactor head end respectively, each capacity step valve group end ground connection, and the terminal short circuit of each capacity level bypass breaker is after public series reactor ground connection.
Wherein, bear the long-time running electric current by bypass breaker, the thyristor valve short-term operation, capacity regulating adopts the mode of thyristor valve current over-zero switching; Because the dividing potential drop effect of auxiliary reactor and the public reactor of series connection is got energy and turning-on voltage for the respective thyristor valve provides, thereby made capacity classification adjustment process rely on the mode of thyristor valve current over-zero switching to finish fully, circuit breaker does not need the folding electric current; When a certain capacity level steady operation, bear the long-time running electric current by circuit breaker, thyristor valve need not work long hours; When system's generation transient state fault, control corresponding thyristor valve or pass and close circuit breaker and make output reach maximum output capacity rapidly, 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, and response speed is fast, and maintenance is convenient, can effectively solve the contradiction between over-voltage and the reactive power compensation, and cooperates neutral point reactor restriction secondary arc current;
The dividing potential drop of 2. auxiliary reactor and public series reactor is got energy and turning-on voltage for corresponding thyristor valve provides, make the handoff procedure of capacity realize by thyristor valve current over-zero switching fully, circuit breaker does not need drop-out current, prolonged circuit breaker service life, can not impact to system, and avoid the problem fallen of capacity of moment in the classification adjustment process;
3. bear the long-time running electric current by circuit breaker, the thyristor valve short-term operation can be adopted the mode of air natural cooling, effectively reduces cost, has reduced maintenance workload.
The novelty of technology:
That northwest 750kV wind-powered electricity generation sends that passage and 1000kV system for ultra-high voltage transmission have the electric pressure height, charging is idle outside is big, over-voltage and problem such as reactive power compensation is particularly thorny, the reactive power difficulty is big, does not also have controlled parallel reactor device to come into operation at present.The connect controlled parallel reactor device of public reactance configurations of employing provided by the invention is applicable to that the frequent 750kV wind-powered electricity generation of reactive voltage fluctuation sends passage and 1000kV transmission system outside.In addition, in extra-high voltage transmission (500kV and 330kV transmission system), there is not the connect stagewise controlled parallel reactor device input of public reactance configurations of employing provided by the invention to use at present yet.
Creation of technology:
(1) the connect stagewise controlled parallel reactor device body of public reactance configurations of the employing that is proposed adopts transformer device structure, can be designed to the external reactor form of high short-circuit impedance form or common transformer according to demand.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, make the handoff procedure of capacity realize by thyristor valve current over-zero switching fully, avoid the employing circuit breaker to cut-off inductance current, effectively prolonged circuit breaker service life.The controllable parallel reactors of home and abroad input engineering application does not at present adopt this kind version.
(2) with present home and abroad put into operation unique 1 stagewise controllable parallel reactors---Xinzhou 500kV stagewise controlled parallel reactor device is compared: the employing that is proposed is connected the stagewise controlled parallel reactor device of public reactance configurations when the capacity classification is regulated, 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 the folding electric current, prolong circuit breaker service life, and avoided the problem fallen of capacity of moment in the classification adjustment process.
The practicality of technology:
(1) employing that the is proposed stagewise controlled parallel reactor device of public reactance configurations of connecting, adopt the configuration of the public reactor of series connection to make the handoff procedure of capacity realize by thyristor valve current over-zero switching fully:
1. when capacity switched from small to large, thyristor valve was taked the mode of operating passing zero, and system is not had impact.After the thyristor valve conducting, breaker closing is born the long-term work electric current, and the thyristor valve short-term operation can be adopted the mode of air natural cooling, effectively reduces cost, has reduced maintenance workload;
2. when capacity switched from big to small, because the dividing potential drop effect of the public reactor of series connection, thyristor valve base electronic unit (VBE) satisfies got the energy requirement, can guarantee the conducting of valve triggered as normal.By the mode that the thyristor valve zero passage is switched, avoided circuit breaker to cut-off inductance current, effectively prolonged circuit breaker service life;
(2) northwest 750kV passway for transmitting electricity and system for ultra-high voltage transmission reactive power fluctuation are frequent, and the reactive power difficulty is very high to the adjusting frequency requirement of controllable parallel reactors.The connect stagewise controlled parallel reactor device of public reactance configurations of the employing that is proposed is suitable for frequent adjusting, is specially adapted to northwest 750kV passway for transmitting electricity and system for ultra-high voltage transmission, and the practical prospect of good engineering is arranged.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
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 high short-circuit impedance version to constitute according to demand, promptly by strengthening the leakage reactance of transformer, transformer and reactor are closed in the one formation, or the external reactor form of common transformer.Have two kinds of working methods of bus controllable parallel reactors and circuit controllable parallel reactors, can be under steady state situations and the transient state situation under realize the adjusting of reactive capability.
The mode that adopts thyristor valve current over-zero switching is regulated in the classification of capacity, can divide multistagely, determines thyristor valve quantity according to minute progression.Fig. 1 is an example with five equilibrium 4 level capacities (25%, 50%, 75%, 100%4 capacity level), the three-phase main wiring diagram when showing five equilibrium 4 level capacities.Concrete form comprises transformer type principal reactance device and auxiliary reactor, and the high-pressure side winding three-phase is connected into " Y " type, directly receives on the high-voltage fence, and the neutral point short circuit is after little reactance grounded.The low-pressure side three-phase structure is identical, and low-pressure side winding head end is drawn through sleeve pipe respectively, and the terminal directly ground connection of low-pressure side winding is disposed thyristor valve, auxiliary reactor, circuit breaker and the public reactor of series connection on the low pressure winding.The auxiliary reactor of each phase is connected respectively, is connected between the head, end of low-pressure side winding; Each capacity step valve group, each capacity level bypass breaker head end link to each other respectively at each auxiliary reactor head end, each capacity step valve group end ground connection, and the terminal short circuit of each capacity level bypass breaker is after public series reactor ground connection.With the b among Fig. 1 is that example describes mutually: in parallel with secondary winding after auxiliary reactor Xb1, Xb2, the Xb3 series connection, be connected on public point b, the y, node between Xb1 and Xb2 is 1b, node between Xb2 and Xb3 is 2b, the end of thyristor valve Tk1, Tk2, Tk3 is connected on respectively on b, 1b, the 2b, is connected on the y node behind the other end short circuit; One end of three circuit breakers is connected on respectively on b, 1b, the 2b, and public reactor Xb of series connection is connected on the y node behind the other end short circuit.
Adopt the mode of thyristor valve current over-zero switching for the adjusting of device reactive capability, can divide multistage, can determine combination switch quantity according to minute progression, with 4 grades is that example illustrates operation principle, and device divides 25%, 50%, 75%, 100% 4 grade, and 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, *---expression disconnects, and zero---the expression conducting.
The classification adjustment process of installed capacity realizes by the mode of control respective thyristor valve current over-zero switching, is the handoff procedure that example is specifically set forth capacity mutually with b below:
1. when capacity switches from small to large, since the dividing potential drop of auxiliary reactor act as the larger capacity thyristor valve provide get can and turning-on voltage, therefore thyristor valve can adopt the mode of current over-zero switching to finish the classification adjusting of capacity, the breaker closing of this grade thyristor valve correspondence is born the long-time running electric current subsequently;
2. when capacity switched from big to small, the dividing potential drop effect of public reactor can be got energy and turning-on voltage for less capacity level thyristor valve provides.Switch to example by 100% capacity level to 75% capacity level with device among Fig. 1, 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 the Db1 is transferred on the Tb1, open circuit breaker Db1 subsequently, locking thyristor valve Tb1 finishes shutoff at current zero-crossing point then, bears the long-time running electric current by the circuit breaker Db2 of closure;
3. when system broke down, thyristor valve Tb1 was open-minded, made controllable parallel reactors reach 100% output capacity rapidly.When close-in fault takes place in controllable parallel reactors body high-pressure side, valve base electronic unit (VBE) can't effectively be got can, corresponding valve group can not trigger open-minded, the mode that can close bypass breaker Db1 this moment by the pass, output capacity is transferred to 100%, effectively suppress power-frequency overvoltage and switching overvoltage;
4. because device is pure inductive element substantially, and the current zero-crossing point that flows through thyristor valve overlaps substantially with thyristor valve both end voltage peak point, therefore can determine the zero crossing of electric current by the peak point that detects the thyristor valve both end voltage.
Adopt the stagewise controlled parallel reactor device regulative mode of the public reactance configurations of series connection simple, transient state governing response speed is very fast, the circuit breaker life-span is long, thyristor valve can adopt air natural cooling mode, cost is little, is fit to be applied to frequent 750kV and the system for ultra-high voltage transmission of regulating of needs controlled reactor capacity.
Invention has been described according to specific exemplary embodiment herein.It will be conspicuous carrying out suitable replacement to one skilled in the art or revise under not departing from the scope of the present invention.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.
Claims (3)
1. stagewise controlled parallel reactor device that adopts the configuration of the public reactor of series connection, it is characterized in that the controllable parallel reactors body adopts transformer device structure, adopt high short-circuit impedance version to constitute, promptly by strengthening the leakage reactance of transformer, transformer and reactor are closed in the one formation, or adopt the external reactor form of common transformer.
2. controlled parallel reactor device as claimed in claim 1, it is characterized in that comprising 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 the high-voltage fence, high-pressure side winding neutral point short circuit is after reactor ground connection; The low-pressure side three-phase structure of described controllable parallel reactors is identical, and three-phase low-pressure side winding head end is drawn through sleeve pipe respectively, the terminal directly ground connection of low-pressure side winding; The auxiliary reactor of each phase is connected respectively, is connected between the head, end of low-pressure side winding; The valve group of each capacity level, the bypass breaker head end of each capacity level link to each other with each auxiliary reactor head end respectively, each capacity step valve group end ground connection, and the terminal short circuit of each capacity level bypass breaker is after public series reactor ground connection.
3. controlled parallel reactor device as claimed in claim 1 or 2 is characterized in that bearing the long-time running electric current by bypass breaker, the thyristor valve short-term operation, and capacity regulating adopts the mode of thyristor valve current over-zero switching; Because the dividing potential drop effect of auxiliary reactor and the public reactor of series connection is got energy and turning-on voltage for the respective thyristor valve provides, thereby made capacity classification adjustment process rely on the mode of thyristor valve current over-zero switching to finish fully, circuit breaker does not need the folding electric current; When a certain capacity level steady operation, bear the long-time running electric current by circuit breaker, thyristor valve need not work long hours; When system's generation transient state fault, control corresponding thyristor valve or pass and close circuit breaker and make output reach maximum output capacity rapidly, effectively suppress power-frequency overvoltage and switching overvoltage.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102904287A (en) * | 2012-09-27 | 2013-01-30 | 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 |
| CN104319790A (en) * | 2014-11-14 | 2015-01-28 | 国家电网公司 | Six-pulse TCT-type controllable paralleling reactor |
| CN113937723A (en) * | 2020-07-14 | 2022-01-14 | 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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904287A (en) * | 2012-09-27 | 2013-01-30 | 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 |
| 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 |
| CN104319790A (en) * | 2014-11-14 | 2015-01-28 | 国家电网公司 | Six-pulse TCT-type controllable paralleling reactor |
| CN113937723A (en) * | 2020-07-14 | 2022-01-14 | 南京南瑞继保工程技术有限公司 | Relay protection system suitable for contain series reactor circuit |
| 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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