CN111371303A - Alternating current side starting circuit with double circuit breakers on valve side of converter transformer in flexible-direct engineering - Google Patents
Alternating current side starting circuit with double circuit breakers on valve side of converter transformer in flexible-direct engineering Download PDFInfo
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- CN111371303A CN111371303A CN202010347853.8A CN202010347853A CN111371303A CN 111371303 A CN111371303 A CN 111371303A CN 202010347853 A CN202010347853 A CN 202010347853A CN 111371303 A CN111371303 A CN 111371303A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention relates to a starting circuit used in flexible and direct engineering, in particular to an alternating current side starting circuit with double circuit breakers on a valve side of a converter transformer in the flexible and direct engineering, wherein the valve side circuit breaker and a double grounding isolating switch are connected in series between the converter transformer and a valve hall, and a horizontal isolating switch is connected in series on a starting resistor branch in an original starting parallel circuit, so that the double circuit breakers with the same electrical parameters are connected, the direct current short-circuit current is ensured to be effectively cut off in time, and the fault expansion is avoided; when the circuit breaker normally operates, the starting circuit breaker does not operate with a starting resistor any more, so that the problem of hidden danger of the operation of the starting resistor is solved; in addition, because the double grounding isolating switch is arranged between the double circuit breakers, corresponding isolating break points are provided, the overhauling of the circuit breakers at two sides and the corresponding converter transformer or the bridge arm at the valve side can be effectively considered, the overhauling safety is greatly improved, and the personal safety of the overhauling personnel is guaranteed.
Description
Technical Field
The invention relates to an alternating current side starting circuit in flexible and straight engineering, in particular to an alternating current side starting circuit with double circuit breakers at a valve side of a converter transformer in flexible and straight engineering.
Background
In the flexible direct current project, the starting modes of the converter station are divided into alternating current side starting and direct current side starting. In the case of ac-side start, the start-up circuit may be provided on the ac network side (hereinafter referred to as "network side") of the converter transformer, or may be provided on the converter valve side (hereinafter referred to as "valve side") of the converter transformer. When the direct-current short-circuit current of the flexible direct-current engineering is small, or the arrangement is limited and a converter transformer needs to be inserted into a valve hall for design, the network side starting is preferably considered; when the current of the flexible direct current engineering direct current breaker is large, the design that the converter transformer is separated from the converter valve hall is considered to reduce the manufacturing difficulty of the converter transformer and improve the fire protection requirement, and the valve side starting is preferably considered.
The starting circuit on the converter valve side of the existing converter transformer comprises a starting circuit isolating switch, a starting circuit breaker and a starting resistor, wherein the starting resistor is connected to two sides of the starting circuit breaker in parallel.
In the uncontrollable charging stage of the starting process, the converter valve is in a locking state, a starting circuit breaker connected with a starting resistor in parallel is in a disconnection state, the starting resistor is connected into a main circuit to inhibit overcurrent in the charging process, the alternating current system finishes charging the capacitance of the converter valve submodule, when the capacitance voltage of the converter valve submodule rises to the ratio of the peak value of the alternating current line voltage at the valve side of the converter transformer to the total number of the single-bridge-arm submodules, the capacitance voltage rises to the maximum value, the charging current is turned off due to the clamping effect of the submodule capacitance, and the uncontrollable charging stage is finished. And entering a controllable charging stage after the uncontrollable charging stage is finished, closing a starting loop circuit breaker connected with the starting resistor in parallel at the moment to enable the starting resistor to be bypassed, unlocking the converter valve and entering a normal operation stage.
The above-described start-up loop has the following problems:
1) the existing starting circuit is only provided with a single circuit breaker, namely, the starting circuit breaker, when the circuit breaker fails, the circuit breaker cannot trip, direct current short-circuit current needs to be cut off through a network side alternating current circuit breaker, and the direct current short-circuit current cannot be cut off due to the fact that the capacity of the network side alternating current circuit breaker for cutting off direct current short-circuit current components is insufficient, so that the system is unreliable in operation, and the safety is insufficient.
2) When the charging is finished and the circuit enters a normal working state, the starting circuit breaker is in a closing state, the starting resistors are connected in parallel to two sides of the starting circuit breaker, the circuit breaker operates with the starting resistors, when a short-circuit fault occurs in a loop, the starting circuit breaker trips, but the loop is not completely disconnected, and still direct-current short-circuit current passes through the starting resistors, so that thermal shock is caused to the starting resistors, the starting resistors are heated and even burnt out, and potential safety hazards exist.
3) When the converter valve/bridge arm reactor (valve side equipment) equipment is overhauled, the alternating current side starts a loop breaker and needs to be opened, but no corresponding isolating switch is arranged on the side of the converter valve/bridge arm reactor to form an obvious breakpoint, and a ground wire needs to be additionally hung after the ground switch is closed, so that the personal safety is difficult to guarantee, and the operation and maintenance are inconvenient.
Disclosure of Invention
The invention aims to provide an alternating current side starting circuit of a flexible direct current engineering converter valve side transformer with double circuit breakers, which can ensure that direct current short-circuit current is cut off, the system is ensured to run safely and reliably, starting resistors are effectively protected, and operation and maintenance are facilitated.
The purpose of the invention is realized by the following ways:
the AC side starting circuit of the converter transformer valve side with double circuit breakers in the flexible-direct engineering comprises a parallel circuit consisting of a starting circuit breaker and a starting resistor, and is characterized by also comprising a valve side circuit breaker, a horizontal double-grounding isolating switch and a horizontal ungrounded isolating switch, wherein the horizontal ungrounded isolating switch is connected on a branch where the starting resistor is located and is connected with the starting resistor in series, and the valve side circuit breaker and the horizontal double-grounding isolating switch are connected between the parallel circuit and converter transformer side equipment in series; the valve side circuit breaker and the starting circuit breaker have the same electrical parameters; a front grounding disconnecting link is arranged on the side, close to the converter transformer, of the valve side circuit breaker; a rear-mounted grounding disconnecting link is arranged on the side, close to the converter valve, of the branch where the starting circuit breaker is located;
in the uncontrollable charging stage in the starting process, a loop circuit breaker is started to open a brake, a horizontal ungrounded disconnecting switch, a valve side circuit breaker and a horizontal double-grounded disconnecting switch are all closed, electric energy flows through a converter transformer, transformer side equipment, the valve side circuit breaker, the horizontal double-grounded disconnecting switch, the horizontal ungrounded disconnecting switch, a starting resistor and a valve side bridge arm reactor in sequence, and finally a converter valve is connected to finish the capacitor charging of a converter valve submodule; when the voltage of a converter valve submodule capacitor rises to the ratio of the peak value of the voltage of an alternating current line on the valve side of a converter transformer to the total number of single-bridge-arm submodules, the voltage of the capacitor rises to the maximum value, the charging current is turned off due to the clamping effect of the submodule capacitor, the uncontrollable charging stage is ended, and the controllable charging stage is started;
in the controllable charging stage of the starting process, a circuit breaker is started to be switched on, a horizontal ungrounded disconnecting switch is pulled open under the equipotential state, a starting resistor is withdrawn, a valve side circuit breaker and a horizontal double-grounded disconnecting switch keep being switched on, and electric energy flows sequentially through a converter transformer, transformer side equipment, the valve side circuit breaker, the horizontal double-grounded disconnecting switch, the starting circuit breaker and a valve side bridge arm reactor and is finally connected into a converter valve, so that the converter valve enters a normal running state;
when converter transformer or valve side circuit breaker overhauld, with valve side circuit breaker separating brake, in the two earthing isolator of level: the main knife is opened, the switch is closed by the grounding knife at one side of the circuit breaker at the valve replacing side, the switch is opened by the grounding knife at one side of the circuit breaker at the starting circuit, and the preposed grounding knife is closed, so that an obvious breakpoint is ensured, and the personal safety is guaranteed.
When the converter valve or the bridge arm reactor or the starting circuit breaker is overhauled, the starting circuit breaker is switched off, and in the horizontal double-grounding isolating switch: the main knife is opened, the grounding knife at one side of the circuit breaker close to the valve changing side is opened, and the grounding knife at one side of the circuit breaker close to the starting loop is closed; the rear earth knife switch of the branch where the loop breaker is located is started to close, so that an obvious breakpoint is ensured, and personal safety is guaranteed.
The invention adopts an alternating current side starting circuit with a double-circuit breaker structure, wherein a valve side circuit breaker and a starting circuit breaker are arranged in the circuit, and the electrical parameters of the valve side circuit breaker and the starting circuit breaker are completely consistent; by connecting the horizontal ungrounded disconnecting switch in series on the starting resistor branch circuit, after the starting process is finished, the horizontal ungrounded disconnecting switch is switched off in an equipotential state, so that the starting circuit breaker is ensured to operate without the starting resistor, and when any one breaker fails, the other breaker can be effectively switched off, so that the faults can be quickly removed, and the safety of equipment such as a converter valve, a converter transformer and the like is ensured. On the other hand, under the normal operation state, the starting resistor quits the operation, so that the situation that the circuit is not completely disconnected after the starting circuit breaker trips when a fault occurs in the wiring of the single circuit breaker is avoided, direct-current short-circuit current still passes through the starting resistor, thermal shock is caused to the starting resistor, and the potential safety hazard that the circuit is possibly heated or even burnt out exists. In the circuit, a horizontal double-grounding isolating switch, a valve side circuit breaker converter transformer side grounding disconnecting link, a starting circuit breaker valve side grounding disconnecting link and the like are arranged, so that obvious breakpoints can be provided for maintenance, the safety of maintenance personnel is ensured, and the operation is convenient.
The invention may further be embodied as:
the device also comprises a loop current measuring device which is connected in series on a branch where the starting resistor is located in the parallel loop and between the horizontal ungrounded disconnecting switch and the starting resistor.
The loop current measuring device is used for measuring the current parameters of a branch where the starting resistor is located in the starting process, so that the monitoring effect on the operation of the starting resistor and the horizontal ungrounded disconnecting switch is achieved.
In summary, the present invention provides an ac side start-up circuit with double circuit breakers at the valve side of a converter transformer in flexible-direct engineering, wherein the valve side circuit breaker and a horizontal double-grounded disconnecting switch are connected in series between the converter transformer and a valve hall, and the horizontal non-grounded disconnecting switch is connected in series on a start resistor branch in an original start parallel circuit, so that the double circuit breakers with the same electrical parameters are wired, thereby ensuring that the dc short circuit current is effectively cut off in time, and avoiding fault amplification; when the circuit breaker normally operates, the starting circuit breaker does not operate with a starting resistor any more, so that the problem of hidden danger of the operation of the starting resistor is solved; in addition, because the horizontal double-grounding isolating switch is arranged between the double circuit breakers, corresponding isolating break points are provided, the overhauling of the circuit breakers at two sides and the corresponding converter transformer or the valve side bridge arm can be effectively considered, the overhauling safety is greatly improved, and the personal safety of the overhauling personnel is guaranteed.
Drawings
Fig. 1 is a schematic circuit wiring diagram of an ac side starting circuit with double circuit breakers at a valve side of a flexible-direct engineering converter transformer according to the present invention;
FIG. 2 is a schematic circuit wiring diagram of an AC side starting circuit with a double circuit breaker on a valve side during a starting process;
FIG. 3 is a circuit wiring diagram of an AC side starting circuit with a double circuit breaker on a valve side in a normal operation state;
FIG. 4 is a schematic circuit wiring diagram of an AC side startup circuit with a double circuit breaker on a valve side when a converter transformer or the valve side circuit breaker is overhauled;
fig. 5 is a circuit wiring schematic diagram of an alternating current side starting circuit with a double circuit breaker on a valve side when a converter valve or a starting circuit breaker is overhauled.
The present invention will be further described with reference to the following examples.
Detailed Description
The best embodiment is as follows:
referring to fig. 1, the present embodiment takes the valve side as an example, the ac side starting circuit with double circuit breakers on the valve side of the flexible direct current engineering converter transformer comprises a parallel circuit consisting of a starting circuit breaker 20 and a starting resistor 19, a pre-grounding knife switch 14 arranged on the converter transformer side of the valve side circuit breaker, a valve side circuit breaker 15, a horizontal double grounding disconnector 16, the system comprises a horizontal ungrounded disconnecting switch 17, a loop current measuring device 18 and a rear grounding disconnecting switch 21 arranged on the converter valve side of a starting loop breaker, wherein the horizontal ungrounded disconnecting switch 17 and the loop current measuring device 18 are connected on a branch where a starting resistor 19 is arranged and are connected in series with the starting resistor 19, a valve side breaker 15 and a horizontal double grounding disconnecting switch 16 are connected in series between converter transformer side equipment and a parallel loop, and a front grounding disconnecting switch 14 is arranged between the converter transformer side equipment and the valve side breaker 15; in the parallel circuit, a rear earthing knife-switch 21 is installed on a branch where a starting circuit breaker 20 is located and close to one side of a valve side bridge arm reactor 23; the valve-side circuit breaker 15 has the same electrical parameters as the starting circuit breaker 20.
As shown in fig. 1, 11 is a converter transformer, and converter transformer side equipment comprises an AV arrester 12 and a voltage measuring device 13; the valve side equipment comprises a valve side bridge arm reactor 23 and a valve hall bridge arm wall bushing 24; the front grounding disconnecting link 14 and the rear grounding disconnecting link 21 are both single-column vertical open type grounding switches; the horizontal double-grounding isolating switch 16 adopts a double-column horizontal telescopic double-grounding isolating switch; the horizontal ungrounded disconnecting switch 17 adopts a double-column horizontal telescopic ungrounded disconnecting switch.
The operation of the alternating current side starting loop with the double circuit breakers at the valve side of the flexible-direct engineering converter transformer is as follows:
1) starting the converter valve through an alternating current system, and charging a sub-module capacitor of the converter valve, wherein the operation sequence is as follows with reference to the attached figure 2: the method comprises the following steps of preparing an alternating current system → charging a converter transformer in a no-load mode → switching on a horizontal ungrounded disconnecting switch 17 → switching on a horizontal double-grounded disconnecting switch 16 and a valve side circuit breaker 15, completing the process of charging a converter valve capacitor by the alternating current system after 15-30 min, wherein the flowing direction of electric energy is as follows: communication system → 11 → 12 → 13 → 15 → 16 → 17 → 18 → 19 → 22 → 23 → 24 → valve hall.
2) After the direct-current voltage of the converter valve is established, the converter valve enters a normal operation state, and reference is made to the attached figure 3. The operation sequence is as follows: starting the loop circuit breaker 20 to close → the horizontal ungrounded disconnecting switch 17 to open → entering a normal running state, wherein the electric energy flow direction is as follows: communication system → 11 → 12 → 13 → 15 → 16 → 20 → 22 → 23 → 24 → valve hall.
3) When the converter transformer or the valve side circuit breaker is overhauled, refer to fig. 4. The operation sequence is as follows: the valve side circuit breaker 15 is switched off, the horizontal double-grounding isolating switch 16 is switched off, the front grounding knife switch 14 is switched on, and the horizontal double-grounding isolating switch 16 is switched on when being close to the grounding knife at the valve side circuit breaker 15 side, so that an obvious breakpoint is ensured, and the personal safety is guaranteed.
4) When the converter valve or the starting circuit breaker is overhauled, refer to the attached figure 5. The operation sequence is as follows: the starting circuit breaker 20 is switched off, the horizontal double-grounding isolating switch 16 is switched off, the rear grounding disconnecting link 21 is switched on, and the horizontal double-grounding isolating switch 16 is switched on when being close to the grounding knife at the side of the starting circuit breaker 20, so that an obvious breakpoint is ensured, and the personal safety is guaranteed.
In addition, the electrical parameters of the valve side circuit breaker 15 and the starting circuit breaker 20 are completely consistent, when any one circuit breaker fails, the other circuit breaker is tripped, the fault is quickly removed, and the safety of equipment such as a converter valve, a converter transformer and the like is guaranteed. After the charging process is finished, after the starting circuit breaker 20 is closed, the horizontal isolating switch 17 in the equipotential state is opened, and the starting resistor is withdrawn, so that the electrical parameter characteristics of the valve side circuit breaker 15 and the starting circuit breaker 20 are completely consistent.
The key points of the invention comprise:
1) the setting of two circuit breakers ensures that direct current short-circuit current can in time effectively be cut off on the one hand, and on the other hand can compromise the maintenance that two circuit breaker both sides set up, forms corresponding isolation breakpoint, overhauls the safety guarantee and promotes greatly.
2) The horizontal ungrounded disconnecting switch is connected in series before the starting resistor, the horizontal ungrounded disconnecting switch is pulled open by equipotential after the starting process is completed, the starting resistor is withdrawn from operation during normal operation, and the potential safety hazard problem which may exist is eliminated.
3) When arranging interchange side start-up circuit in outdoor place, avoid converter transformer to insert the design in valve room, reduce the converter transformer on the one hand and make the degree of difficulty, on the other hand also is favorable to the requirement of poppet valve room fire prevention.
The parts of the invention not described are the same as the prior art.
Claims (2)
1. The alternating current side starting circuit with the double circuit breakers on the valve side of the converter transformer in the flexible direct engineering comprises a parallel circuit consisting of a starting circuit breaker and a starting resistor, and is characterized by further comprising a valve side circuit breaker, a horizontal double grounding isolating switch and a horizontal ungrounded isolating switch, wherein the horizontal ungrounded isolating switch is connected to a branch where the starting resistor is located and is connected with the starting resistor in series, and the valve side circuit breaker and the horizontal double grounding isolating switch are connected between the parallel circuit and converter transformer side equipment in series; the valve side circuit breaker and the starting circuit breaker have the same electrical parameters; a front grounding disconnecting link is arranged on the side, close to the converter transformer, of the valve side circuit breaker; a rear-mounted grounding disconnecting link is arranged on the side, close to the converter valve, of the branch where the starting circuit breaker is located;
in the uncontrollable charging stage in the starting process, a loop circuit breaker is started to open a brake, a horizontal ungrounded disconnecting switch, a valve side circuit breaker and a horizontal double-grounded disconnecting switch are all closed, electric energy flows through a converter transformer, transformer side equipment, the valve side circuit breaker, the horizontal double-grounded disconnecting switch, the horizontal ungrounded disconnecting switch, a starting resistor and a valve side bridge arm reactor in sequence, and finally a converter valve is connected to finish the capacitor charging of a converter valve submodule;
in the controllable charging stage of the starting process, a circuit breaker is started to be switched on, a horizontal ungrounded disconnecting switch is pulled open under the equipotential state, a starting resistor is withdrawn, a valve side circuit breaker and a horizontal double-grounded disconnecting switch keep being switched on, and electric energy flows sequentially through a converter transformer, transformer side equipment, the valve side circuit breaker, the horizontal double-grounded disconnecting switch, the starting circuit breaker and a valve side bridge arm reactor and is finally connected into a converter valve, so that the converter valve enters a normal running state;
when converter transformer or valve side circuit breaker overhauld, with valve side circuit breaker separating brake, in the two earthing isolator of level: the main knife is switched off, the grounding knife at one side of the circuit breaker close to the valve changing side is switched on, the grounding knife at one side close to the starting circuit breaker is switched off, and the preposed grounding knife is switched on;
when the converter valve or the bridge arm reactor or the starting circuit breaker is overhauled, the starting circuit breaker is switched off, and in the horizontal double-grounding isolating switch: the main knife is opened, the grounding knife at one side of the circuit breaker close to the valve changing side is opened, and the grounding knife at one side of the circuit breaker close to the starting loop is closed; and starting the post-positioned earth knife switch of the branch where the loop breaker is positioned to switch on.
2. The ac-side starting circuit with double breakers on the valve side of the flexible-direct engineering converter transformer according to claim 1, characterized by further comprising a circuit current measuring device, which is connected in series between the horizontal ungrounded disconnector and the starting resistor on the branch where the starting resistor is located in the parallel circuit.
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| CN202010347853.8A CN111371303B (en) | 2020-04-28 | 2020-04-28 | Alternating current side starting loop with double circuit breakers at valve side of flexible direct engineering converter transformer |
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| CN202010347853.8A CN111371303B (en) | 2020-04-28 | 2020-04-28 | Alternating current side starting loop with double circuit breakers at valve side of flexible direct engineering converter transformer |
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| CN111371303B CN111371303B (en) | 2024-04-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112736924A (en) * | 2020-12-11 | 2021-04-30 | 深圳供电局有限公司 | Power transmission system |
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| CN110247560A (en) * | 2019-07-10 | 2019-09-17 | 南方电网科学研究院有限责任公司 | A kind of flexible direct current converter station valve hall and converter valve wire inlet system |
| CN110492516A (en) * | 2019-07-29 | 2019-11-22 | 南方电网科学研究院有限责任公司 | A kind of extra-high voltage Multi-end flexible direct current transmission converter station system and its control method |
| CN211720471U (en) * | 2020-04-28 | 2020-10-20 | 中国电建集团福建省电力勘测设计院有限公司 | Flexible direct current engineering alternating current side starting device with double circuit breakers on valve side of converter transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112736924A (en) * | 2020-12-11 | 2021-04-30 | 深圳供电局有限公司 | Power transmission system |
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