CN104158227A - Control method for converter - Google Patents
Control method for converter Download PDFInfo
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- CN104158227A CN104158227A CN201410366872.XA CN201410366872A CN104158227A CN 104158227 A CN104158227 A CN 104158227A CN 201410366872 A CN201410366872 A CN 201410366872A CN 104158227 A CN104158227 A CN 104158227A
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- contactor
- current transformer
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- circuit breaker
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Abstract
A control method for a converter comprises the following steps: firstly, a circuit breaker is in an off state during starting, the converter receives a starting command, a soft starting contactor is switched on and a DC bus capacitor is charged, after the DC bus capacitor is charged, the circuit breaker is switched on, and after reliable switch-on of the circuit breaker is detected, the soft starting contactor is disconnected; a network side power module modulates and controls a stable DC bus; then, a machine side power module modulates, to achieve synchronization of stator electric pressure and power network electric pressure, a filter capacitor is charged, and after successful synchronization, a grid-connected contactor is switched on, and the converter enters into a normal generating state; after a main-control stopping command is received, the grid-connected contactor is disconnected from the machine side module, modulation is stopped, the network side module stops modulating, and stopping is accomplished; starting is performed again, charging to the bus capacitor is no longer required, and starting is carried out from the modulation of the network side module. A main contactor k2 on an original main topology is eliminated, the cost is lowered, and the stability of the converter is improved; after stopping, the filter capacitor C2 does not run with net, and wattless pollution cannot be caused on network.
Description
Technical field
The present invention relates to a kind of control method of novel current transformer.
Background technology
Current transformer power topology used for wind power generation (as shown in Figure 1), generally consist of circuit breaker (Q1), grid-connected contactor (K3), soft contactor (K1) and the charging resistor (R1) of opening, main contactor (K2) and back-to-back power modules etc., control logic is that current transformer is received after starting command, first close circuit breaker (Q1), then the closed soft contactor (K1) that opens charges to DC bus, DC bus rises to closed main contactor (K2) after certain value, disconnect the soft contactor (K1) that opens, net side power model GPU1 modulation is stable according to current line voltage control DC bus, stator and synchronized (amplitude and Phase synchronization) are carried out in pusher side power model MPU1 modulation, closed grid-connected contactor (K3) after synchronous success, current transformer enters normal power generation state.When receiving after halt command, grid-connected contactor (K3) disconnects, and pusher side power model MPU1 stops modulation, and net side power model GPU1 stops modulation, and main contactor (K2) disconnects.So, complete grid-connected control and off-grid control.
Summary of the invention
The object of the invention is to have the problems referred to above for existing technology, proposed a kind of control method of current transformer.
Object of the present invention can realize by following technical proposal:
A control method for current transformer, comprises the steps:
Step 1: while opening machine first, circuit breaker is in off-state, and current transformer receives for the first time and opens machine order, and the first closed soft contactor that opens charges to dc-link capacitance;
Step 2: after dc-link capacitance has charged, first close circuit breaker, detects after the reliable closure of circuit breaker, disconnects the soft contactor that opens; Then, the modulation of net side power model, controls stable DC bus; Then, the modulation of rotor-side module, carries out stator voltage and synchronizes with line voltage, is filter capacitor charging simultaneously, closed grid-connected contactor after synchronous success, and current transformer enters normal power generation state;
Step 3: when receiving after master control halt command, first grid-connected contactor disconnects, and catching machine side form piece stops modulation, and finally net side form piece stops modulation, has so far shut down; While again opening machine, to bus capacitor charging, directly start to open machine from the modulation of net side form piece without again, start to open machine from step 2; So repeat, realize the long-term hanging net operation of current transformer.
Step 4: in the time that line voltage fault or current transformer self exist catastrophe failure or current transformer to need power-off service, forced cut-out device, while again opening machine from step 1.
Advantage of the present invention: reduced the upper main contactor K2 of former main topology, reduced costs, improved the stability of current transformer; After shutdown completes, not hanging net operation of filter capacitor C2, not to and site cause idle " pollution ".
Brief description of the drawings
Fig. 1 is existing current transformer topology schematic diagram; Fig. 2 topological schematic diagram of the present invention.
Embodiment
Be below specific embodiments of the invention by reference to the accompanying drawings, technical scheme of the present invention is further described, but the present invention be not limited to these embodiment.
A current transformer topology as shown in Figure 2, comprises pusher side module MPU2, net side form piece GPU2: grid side is connected with motor by circuit breaker Q 2, grid-connected contactor K5; Meanwhile, grid side is connected with motor by the soft contactor K4, resistance R 2, inductance L 2, net side form piece GPU2, pusher side module MPU2 of opening; Described topology also comprises fuse FU2, and described fuse FU2 and circuit breaker Q 2 are in series, with softly open contactor K4, resistance R 2 is in parallel.Be with general convertor difference, open before circuit (R2 and K4) position moves to circuit breaker Q 2 soft, save main contactor K2, it is not only the benefit that minimizing device brings cost, and main contactor K2 is as larger device, to the layout of cabinet inside and the very large facility of having walked tape, make that current transformer integral heat sink is more excellent, the installation and maintenance of on-site cable is more convenient; Meanwhile, filter capacitor unit C2 is directly hung over to motor stator loop, in the time that current transformer pusher side is synchronous, charge to filter capacitor.
Due to the circuit breaker Q factor of 2 mechanical enduranves, the control method of current transformer is modified, concrete control method is as follows:
Step 1: while opening machine first, circuit breaker Q 2 is in off-state, current transformer receives for the first time and opens machine order, first the closed soft contactor K4 that opens charges to dc-link capacitance, after dc-link capacitance has charged, first close circuit breaker Q2, detect after the reliable closure of circuit breaker Q 2, disconnect the soft contactor K4 that opens;
Step 2: then, net side power model GPU2 modulation, controls stable DC bus; Then, pusher side power model MPU2 modulation, carries out stator voltage and synchronizes with line voltage (amplitude and phase place), is filter capacitor C2 charging simultaneously, closed grid-connected contactor K5 after synchronous success, and current transformer enters normal power generation state.
Step 3: when receiving after master control halt command, first grid-connected contactor K5 disconnects, and catching machine side form piece MPU2 stops modulation, and finally net side form piece GPU2 stops modulation, has so far shut down.While again opening machine, to bus capacitor charging, directly start to open machine from net side form piece GPU2 modulation without again, start to open machine from step 2.So repeat, realize the long-term hanging net operation of current transformer.
Step 4: in the time that line voltage fault (overvoltage/undervoltage or cross under-frequency) or current transformer self exist catastrophe failure or current transformer to need power-off service, forced cut-out device Q2, while again opening machine from step 1.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendments or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (1)
1. a control method for current transformer, comprises the steps:
Step 1: while opening machine first, circuit breaker is in off-state, and current transformer receives for the first time and opens machine order, and the first closed soft contactor that opens charges to dc-link capacitance;
Step 2: after dc-link capacitance has charged, first close circuit breaker, detects after the reliable closure of circuit breaker, disconnects the soft contactor that opens; Then, the modulation of net side power model, controls stable DC bus; Then, the modulation of rotor-side module, carries out stator voltage and synchronizes with line voltage, is filter capacitor charging simultaneously, closed grid-connected contactor after synchronous success, and current transformer enters normal power generation state;
Step 3: when receiving after master control halt command, first grid-connected contactor disconnects, and catching machine side form piece stops modulation, and finally net side form piece stops modulation, has so far shut down; While again opening machine, to bus capacitor charging, directly start to open machine from the modulation of net side form piece without again, start to open machine from step 2; So repeat, realize the long-term hanging net operation of current transformer;
Step 4: in the time that line voltage fault or current transformer self exist catastrophe failure or current transformer to need power-off service, forced cut-out device, while again opening machine from step 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410366872.XA CN104158227A (en) | 2014-07-30 | 2014-07-30 | Control method for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410366872.XA CN104158227A (en) | 2014-07-30 | 2014-07-30 | Control method for converter |
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| CN104158227A true CN104158227A (en) | 2014-11-19 |
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| CN201410366872.XA Pending CN104158227A (en) | 2014-07-30 | 2014-07-30 | Control method for converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533147A (en) * | 2016-11-18 | 2017-03-22 | 深圳市禾望电气股份有限公司 | Standby method and device of converter system |
| CN110581642A (en) * | 2018-06-08 | 2019-12-17 | 维谛技术有限公司 | Converter soft start circuit and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201839012U (en) * | 2010-11-10 | 2011-05-18 | 中冶华天工程技术有限公司 | Startup charging and shutdown discharging circuit of static var generator |
| CN102545678A (en) * | 2012-02-16 | 2012-07-04 | 朱建国 | Inverter and startup method thereof |
| CN202997592U (en) * | 2012-12-04 | 2013-06-12 | 浙江海得新能源有限公司 | A current transformer topology |
| CN103855725A (en) * | 2012-12-04 | 2014-06-11 | 浙江海得新能源有限公司 | Converter topology and control method |
-
2014
- 2014-07-30 CN CN201410366872.XA patent/CN104158227A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201839012U (en) * | 2010-11-10 | 2011-05-18 | 中冶华天工程技术有限公司 | Startup charging and shutdown discharging circuit of static var generator |
| CN102545678A (en) * | 2012-02-16 | 2012-07-04 | 朱建国 | Inverter and startup method thereof |
| CN202997592U (en) * | 2012-12-04 | 2013-06-12 | 浙江海得新能源有限公司 | A current transformer topology |
| CN103855725A (en) * | 2012-12-04 | 2014-06-11 | 浙江海得新能源有限公司 | Converter topology and control method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533147A (en) * | 2016-11-18 | 2017-03-22 | 深圳市禾望电气股份有限公司 | Standby method and device of converter system |
| CN106533147B (en) * | 2016-11-18 | 2019-04-16 | 深圳市禾望电气股份有限公司 | A kind of idle method and device of converter system |
| CN110581642A (en) * | 2018-06-08 | 2019-12-17 | 维谛技术有限公司 | Converter soft start circuit and method |
| CN110581642B (en) * | 2018-06-08 | 2020-09-29 | 维谛技术有限公司 | Converter soft start circuit and method |
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Application publication date: 20141119 |