CN106291295B - Chain-end withstand voltage test method for chained STATCOM converter chain - Google Patents
Chain-end withstand voltage test method for chained STATCOM converter chain Download PDFInfo
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Abstract
The invention provides a voltage withstand test circuit and a voltage withstand test method between chain ends of a chained STATCOM (static synchronous compensator) converter chain, wherein the test circuit comprises an input control module, a boosting module, a measurement protection module, a tested module and a charging module; the input control module is connected with the boosting module in series and then is respectively connected with the measuring module, the tested module and the charging module in parallel. And (5) finishing the withstand voltage test between the converter chain ends through a test circuit. The test circuit provided by the invention is simple, convenient and reliable, provides a high-voltage test means of the converter chain, verifies the insulation characteristic and the operation characteristic of the converter chain, and lays a solid foundation for the reliable operation of the STATCOM; the test method has good effect, and the successful implementation of the invention solves the difficult problem of withstand voltage test between high-power converter chain ends, and provides test basis for the productization of high-capacity STATCOM.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a voltage withstand test method between chain ends of a chained STATCOM converter chain.
Background
The static synchronous compensator (Static Synchronous Compensator, STATCOM) is a novel static reactive dynamic compensation device, which consists of a voltage source converter connected in parallel to a system, and the output capacitive or inductive reactive current is continuous, adjustable and independent of the voltage of a connection point with the system. The DC side adopts a DC capacitor as an energy storage element, a turn-off device is utilized to convert the DC side voltage into the AC voltage with the same frequency as the power grid, and the AC side voltage is connected in parallel on the power grid through a connecting reactor, so that the amplitude and the phase of the AC side output voltage are properly regulated, or the AC side current is directly controlled, the device can absorb or send reactive current meeting the requirement, and the purpose of dynamic reactive compensation is realized.
In order to form practical high capacity and low harmonic wave meeting requirements, a STATCOM mostly adopts a chained multi-level topological structure, each phase of converter chain is an independent chain, N basic units with identical structures are connected in series, as shown in figure 1, each basic unit is composed of a fully-controlled high-power device and related circuits, a trigger system, a radiator and an insulating structure thereof through a certain connection mode, the structure and the control are very complex, and the actual operation working condition in an electric power system is also very complex, so that the high-power converter chain is a very complex electric component, and in order to be capable of safely and reliably operating in the system for a long time, high-voltage test is required for the converter chain according to the related test standard requirements of the industry so as to test the insulation strength, the electric characteristics and other operation characteristics of the converter chain.
STATCOM is an important aspect of flexible alternating current transmission technology, and the chain structure is a novel topological structure and is formed by connecting N chain link units with identical structures in series; the direct current side of the chain link unit consists of a direct current capacitor, and the power supply of the chain link unit is completed by an energy taking circuit connected with two ends of the capacitor, as shown in figure 2. For the cascade chain link units, the voltage balance of the direct current bus of each chain link unit is ensured, and each power semiconductor device can be ensured to bear the same stress, so that each element is ensured to be in a safe working range.
Since the constituent elements of the link units cannot be completely identical in hardware, there are differences in parameters, so that there are necessarily some differences in the individual link parameters. For the STATCOM taking energy by the direct current bus, in the starting process, certain differences exist in the starting time, starting power and carried load of the energy taking power supply, the voltage imbalance of the direct current capacitors of all the chain links can be caused due to factors such as the electrical characteristics and parameter inconsistency of the direct current capacitors, the voltage imbalance is particularly obvious in the low-voltage uncontrolled rectifying period, and when the differences are large, the STATCOM can not be started normally, even the direct current side capacitors are caused to be over-voltage, and the safety of the device is threatened.
Disclosure of Invention
In order to solve the problems in the chained STATCOM test, the invention provides a chained STATCOM inter-converter chain end withstand voltage test method which is reliable, achieves good effects, solves the problem of the large-capacity inter-converter chain end test, and provides test basis for the STATCOM.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a chain-type STATCOM converter chain inter-chain voltage withstand test method, which comprises the following steps:
step 1: constructing a withstand voltage test circuit between the converter chain ends;
step 2: the upper computer issues a locking command to each chain link unit of the converter chain;
step 3: confirming that the first circuit breaker and the second circuit breaker are in a breaking state;
step 4: switching on the first switch cabinet, slowly increasing the output voltage of the voltage regulator by controlling the operation console, stopping boosting and keeping the output voltage of the boosting transformer unchanged when the output voltage of the boosting transformer is 90% of the second power supply voltage;
step 5: closing the second circuit breaker;
step 6: closing a second switch cabinet, charging a direct current bus supporting capacitor of each chain link unit of the converter chain through a soft start resistor, checking whether an energy-taking power supply is started normally or not, and checking whether reporting states of each chain link unit are normal or not;
step 7: ensuring that each chain link unit is communicated with an upper computer normally and has no fault information, and opening a second switch cabinet;
step 8: the second circuit breaker is opened, and the first circuit breaker is closed;
step 9: the voltage regulator is regulated by the control console, so that the voltage among the converter chain ends is gradually increased, and in the boosting process, if the direct current bus voltage of each chain link unit in the converter chain displayed by the control console meets the requirement, the voltage among the converter chain ends is continuously increased;
step 10: and after the voltage between the converter chain ends reaches the highest test voltage between the converter chain ends, maintaining for 1 minute, and ending the withstand voltage test between the converter chain ends if no abnormality exists.
The converter chain is formed by connecting a plurality of chain link units in series; the chain link unit comprises a direct current bus supporting capacitor, an energy taking power supply, a full control device, a trigger circuit, a bypass device, a radiator and a chain link unit controller; the test circuit comprises an input control module, a boosting module, a measurement protection module, a tested module and a charging module; the input control module is connected with the boosting module in series and then is respectively connected with the measuring module, the tested module and the charging module in parallel.
The input control module comprises a first power supply and a first switch cabinet;
the first power supply is an alternating current power supply with voltage levels of 10KV and above, and the capacity of the first power supply is required to meet the power required by the static normal operation of each chain link unit when the voltage withstand test between ends is carried out on the converter chain;
the voltage class of the first switch cabinet is the same as that of the first power supply, the capacity of the first switch cabinet is matched with that of the boosting module, and the measuring and protecting module controls the first switch cabinet to protect a converter chain.
The boosting module comprises a voltage regulator, a boosting transformer and a current limiting resistor;
the voltage level of the voltage regulator meets the voltage level of the first power supply, and the capacity of the voltage regulator is matched with the power of the step-up transformer;
the voltage on the primary winding of the step-up transformer is increased through the secondary winding, the secondary winding of the step-up transformer is composed of multiple windings, and the multiple windings are connected in series or in parallel to change the output voltage and the output current of the step-up transformer so as to meet the requirement of performing an inter-terminal withstand voltage test on a converter chain;
the current limiting resistor limits the output current of the step-up transformer, and damage of the step-up transformer due to overload is avoided.
The measurement protection module comprises a first current sensor for collecting output current of the voltage regulator, a second current sensor for collecting output current of the step-up transformer, a voltage sampling circuit, a signal collection conditioning circuit and a control console.
The first current sensor is used for protecting the first power supply when the voltage regulator fails;
the second current sensor is used for protecting the step-up transformer, the voltage regulator and the first power supply when overcurrent faults occur in the converter chain;
the voltage sampling circuit is used for sampling voltage after the voltage of the transformer output voltage is divided by the capacitor, so as to realize the monitoring of the voltage between the converter chain ends and the protection of overvoltage;
and after the signal acquisition conditioning circuit processes the output voltage and the output current of the step-up transformer, the output voltage and the output current are uploaded to the control console to finish data display and data acquisition.
The tested module comprises a converter chain, a first circuit breaker and a second circuit breaker;
the first circuit breaker and the second circuit breaker complete the switching between the boosting module and the charging module, and the two are required to meet the voltage level required by the specification when the highest test voltage is required between the converter chain ends.
The charging module comprises a soft start resistor, a second switch cabinet and a second power supply;
the second power supply charges the direct current bus supporting capacitor in each chain link unit of the converter chain through the soft start resistor, so that the energy required by each energy taking power supply when the power supply is started is met;
the voltage level of the second switch cabinet is the same as that of the second power supply, and the second power supply can be controlled and protected.
Compared with the prior art, the invention has the beneficial effects that:
the test circuit provided by the invention is simple, convenient and reliable, provides a high-voltage test means of the converter chain, verifies the insulation characteristic and the operation characteristic of the converter chain, and lays a solid foundation for the reliable operation of the STATCOM;
the test method provided by the invention has good effect, and the successful implementation of the invention solves the difficult problem of withstand voltage test between high-power converter chain ends, and provides test basis for the commercialization of high-capacity STATCOM.
Drawings
FIG. 1 is a schematic diagram of a link connection of a converter chain in a STATCOM;
FIG. 2 is a schematic diagram of a chain link unit structure in a STATCOM;
fig. 3 is a circuit structure diagram of a withstand voltage test circuit between converter chain ends of a chained STATCOM in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The STATCOM converter chain has complex structure, composition and control, and the operation working conditions in the power system are complex and various, so that the power system can safely and reliably operate for a long time, and according to relevant standard regulations, the converter chain must be subjected to high-voltage test to verify the insulation performance and other operation characteristics of the converter chain.
In a conventional chain-type STATCOM converter chain inter-end test circuit, the voltage which can be output by a test power supply is high, the adjustment range is wide, the power supply capacity is small, when the two ends of a tested converter chain are subjected to the test through a voltage regulator and a step-up transformer, the voltage is gradually increased from low to high, and when the voltage at the two ends of the chain link is increased to the starting voltage of an energy-taking power supply, the power supply is started to supply power to a control circuit. The power supply is larger in starting power, is influenced by the limitation of test power supply capacity and test loop impedance and a protection circuit, can instantly pull down the DC bus voltage in the starting process, is easy to cause repeated starting of the power supply, and can cause unbalanced DC capacitor voltage of each chain link due to the starting time and the load difference of the energy-taking power supply.
Aiming at the problem of unbalanced direct current voltage in the starting process, a voltage equalizing circuit can be designed in the chain link unit, the circuit mainly comprises a power resistor and a switching device, and when the direct current voltage is higher, the voltage equalizing circuit is started to forcedly balance the direct current capacitance voltage, but the method tends to increase the loss and the cost of the device.
As shown in fig. 3, the invention provides a chain-type STATCOM converter chain end voltage withstand test circuit, wherein the converter chain consists of a plurality of chain link units connected in series; the chain link unit comprises a direct current bus supporting capacitor, an energy taking power supply, a full control device, a trigger circuit, a bypass device, a radiator and a chain link unit controller; the test circuit comprises an input control module, a boosting module, a measurement protection module, a tested module and a charging module; the input control module is connected with the boosting module in series and then is respectively connected with the measuring module, the tested module and the charging module in parallel.
The input control module comprises a first power supply and a first switch cabinet;
the first power supply is an alternating current power supply with voltage levels of 10KV and above, and the capacity of the first power supply is required to meet the power required by the static normal operation of each chain link unit when the voltage withstand test between ends is carried out on the converter chain;
the voltage class of the first switch cabinet is the same as that of the first power supply, the capacity of the first switch cabinet is matched with that of the boosting module, and the measuring and protecting module controls the first switch cabinet to protect a converter chain.
The boosting module comprises a voltage regulator, a boosting transformer and a current limiting resistor;
the voltage level of the voltage regulator meets the voltage level of the first power supply, and the capacity of the voltage regulator is matched with the power of the step-up transformer;
the voltage on the primary winding of the step-up transformer is increased through the secondary winding, the secondary winding of the step-up transformer is composed of multiple windings, and the multiple windings are connected in series or in parallel to change the output voltage and the output current of the step-up transformer so as to meet the requirement of performing an inter-terminal withstand voltage test on a converter chain;
the current limiting resistor limits the output current of the step-up transformer, and damage of the step-up transformer due to overload is avoided.
The measurement protection module comprises a first current sensor for collecting output current of the voltage regulator, a second current sensor for collecting output current of the step-up transformer, a voltage sampling circuit, a signal collection conditioning circuit and a control console.
The first current sensor is used for protecting the first power supply when the voltage regulator fails;
the second current sensor is used for protecting the step-up transformer, the voltage regulator and the first power supply when overcurrent faults occur in the converter chain;
the voltage sampling circuit is used for sampling voltage after the voltage of the transformer output voltage is divided by the capacitor, so as to realize the monitoring of the voltage between the converter chain ends and the protection of overvoltage;
and after the signal acquisition conditioning circuit processes the output voltage and the output current of the step-up transformer, the output voltage and the output current are uploaded to the control console to finish data display and data acquisition.
The tested module comprises a converter chain, a first circuit breaker and a second circuit breaker;
the first circuit breaker and the second circuit breaker complete the switching between the boosting module and the charging module, and the two are required to meet the voltage level required by the specification when the highest test voltage is required between the converter chain ends.
The charging module comprises a soft start resistor, a second switch cabinet and a second power supply;
the second power supply charges the direct current bus supporting capacitor in each chain link unit of the converter chain through the soft start resistor, so that the energy required by each energy taking power supply when the power supply is started is met;
the voltage level of the second switch cabinet is the same as that of the second power supply, and the second power supply can be controlled and protected.
The invention also provides a chain-type STATCOM converter chain inter-chain voltage withstand test method, which comprises the following steps:
step 1: constructing a withstand voltage test circuit between the converter chain ends;
step 2: the upper computer issues a locking command to each chain link unit of the converter chain;
step 3: confirming that the first circuit breaker and the second circuit breaker are in a breaking state;
step 4: switching on the first switch cabinet, slowly increasing the output voltage of the voltage regulator by controlling the operation console, stopping boosting and keeping the output voltage of the boosting transformer unchanged when the output voltage of the boosting transformer is 90% of the second power supply voltage;
step 5: closing the second circuit breaker;
step 6: closing a second switch cabinet, charging a direct current bus supporting capacitor of each chain link unit of the converter chain through a soft start resistor, checking whether an energy-taking power supply is started normally or not, and checking whether reporting states of each chain link unit are normal or not;
step 7: ensuring that each chain link unit is communicated with an upper computer normally and has no fault information, and opening a second switch cabinet;
step 8: the second circuit breaker is opened, and the first circuit breaker is closed;
step 9: the voltage regulator is regulated by the control console, so that the voltage among the converter chain ends is gradually increased, and in the boosting process, if the direct current bus voltage of each chain link unit in the converter chain displayed by the control console meets the requirement, the voltage among the converter chain ends is continuously increased;
step 10: and after the voltage between the converter chain ends reaches the highest test voltage between the converter chain ends, maintaining for 1 minute, and ending the withstand voltage test between the converter chain ends if no abnormality exists.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and a person skilled in the art may still make modifications and equivalents to the specific embodiments of the present invention with reference to the above embodiments, and any modifications and equivalents not departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as filed herewith.
Claims (7)
1. The chain-end withstand voltage test method for the chained STATCOM converter chain is characterized by comprising the following steps of:
step 1: constructing a withstand voltage test circuit between the converter chain ends;
step 2: the upper computer issues a locking command to each chain link unit of the converter chain;
step 3: confirming that the first circuit breaker and the second circuit breaker are in a breaking state;
step 4: switching on the first switch cabinet, slowly increasing the output voltage of the voltage regulator by controlling the operation console, stopping boosting and keeping the output voltage of the boosting transformer unchanged when the output voltage of the boosting transformer is 90% of the second power supply voltage;
step 5: closing the second circuit breaker;
step 6: closing a second switch cabinet, charging a direct current bus supporting capacitor of each chain link unit of the converter chain through a soft start resistor, checking whether an energy-taking power supply is started normally or not, and checking whether reporting states of each chain link unit are normal or not;
step 7: ensuring that each chain link unit is communicated with an upper computer normally and has no fault information, and opening a second switch cabinet;
step 8: the second circuit breaker is opened, and the first circuit breaker is closed;
step 9: the voltage regulator is regulated by the control console, so that the voltage among the converter chain ends is gradually increased, and in the boosting process, if the direct current bus voltage of each chain link unit in the converter chain displayed by the control console meets the requirement, the voltage among the converter chain ends is continuously increased;
step 10: after the voltage between the converter chain ends reaches the highest test voltage between the converter chain ends, maintaining for 1 minute, and ending the withstand voltage test between the converter chain ends if no abnormality exists;
the chain link unit comprises a direct current bus supporting capacitor, an energy taking power supply, a full control device, a trigger circuit, a bypass device, a radiator and a chain link unit controller; the method is characterized in that: the test circuit comprises an input control module, a boosting module, a measurement protection module, a tested module and a charging module; the input control module is connected with the boosting module in series and then is respectively connected with the measuring module, the tested module and the charging module in parallel.
2. The chained STATCOM converter chain inter-end withstand voltage test method according to claim 1, characterized in that: the input control module comprises a first power supply and a first switch cabinet;
the first power supply is an alternating current power supply with voltage levels of 10KV and above, and the capacity of the first power supply is required to meet the power required by the static normal operation of each chain link unit when the voltage withstand test between ends is carried out on the converter chain;
the voltage class of the first switch cabinet is the same as that of the first power supply, the capacity of the first switch cabinet is matched with that of the boosting module, and the measuring and protecting module controls the first switch cabinet to protect a converter chain.
3. The chained STATCOM converter chain inter-end withstand voltage test method according to claim 1, characterized in that: the boosting module comprises a voltage regulator, a boosting transformer and a current limiting resistor;
the voltage level of the voltage regulator meets the voltage level of the first power supply, and the capacity of the voltage regulator is matched with the power of the step-up transformer;
the voltage on the primary winding of the step-up transformer is increased through the secondary winding, the secondary winding of the step-up transformer is composed of multiple windings, and the multiple windings are connected in series or in parallel to change the output voltage and the output current of the step-up transformer so as to meet the requirement of performing an inter-terminal withstand voltage test on a converter chain;
the current limiting resistor limits the output current of the step-up transformer, and damage of the step-up transformer due to overload is avoided.
4. The chained STATCOM converter chain inter-end withstand voltage test method according to claim 1, characterized in that: the measurement protection module comprises a first current sensor for collecting output current of the voltage regulator, a second current sensor for collecting output current of the step-up transformer, a voltage sampling circuit, a signal collection conditioning circuit and a control console.
5. The method for testing the withstand voltage between chain ends of chained STATCOM converter according to claim 4, which is characterized by comprising the following steps: the first current sensor is used for protecting the first power supply when the voltage regulator fails;
the second current sensor is used for protecting the step-up transformer, the voltage regulator and the first power supply when overcurrent faults occur in the converter chain;
the voltage sampling circuit is used for sampling voltage after the voltage of the transformer output voltage is divided by the capacitor, so as to realize the monitoring of the voltage between the converter chain ends and the protection of overvoltage;
and after the signal acquisition conditioning circuit processes the output voltage and the output current of the step-up transformer, the output voltage and the output current are uploaded to the control console to finish data display and data acquisition.
6. The chained STATCOM converter chain inter-end withstand voltage test method according to claim 1, characterized in that: the tested module comprises a converter chain, a first circuit breaker and a second circuit breaker;
the first circuit breaker and the second circuit breaker complete the switching between the boosting module and the charging module, and the two are required to meet the voltage level required by the specification when the highest test voltage is required between the converter chain ends.
7. The chained STATCOM converter chain inter-end withstand voltage test method according to claim 1, characterized in that: the charging module comprises a soft start resistor, a second switch cabinet and a second power supply;
the second power supply charges the direct current bus supporting capacitor in each chain link unit of the converter chain through the soft start resistor, so that the energy required by each energy taking power supply when the power supply is started is met;
the voltage level of the second switch cabinet is the same as that of the second power supply, and the second power supply can be controlled and protected.
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| CN112532072B (en) * | 2020-03-26 | 2022-03-29 | 南京南瑞继保电气有限公司 | Modular multi-level submodule, valve tower and alternating current withstand voltage test method |
| CN114167278B (en) * | 2022-02-11 | 2022-05-17 | 华北电力科学研究院有限责任公司 | Flexible direct-current transmission voltage source converter valve test method and power supply device |
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| CN1818698A (en) * | 2006-03-17 | 2006-08-16 | 中国电力科学研究院 | Experimental method of chain static synchronous compensator IGCT valve |
| CN201956689U (en) * | 2010-12-31 | 2011-08-31 | 中电普瑞科技有限公司 | Bypass structure of chain link unit of static synchronous compensator |
| CN202353227U (en) * | 2011-12-15 | 2012-07-25 | 中电普瑞科技有限公司 | Alternate charging starting circuit for chain circuit static synchronous compensator |
| CN203825115U (en) * | 2014-04-21 | 2014-09-10 | 郭高朋 | Full-power test device of STATCOM sub modules |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102377324B (en) * | 2011-10-18 | 2013-09-04 | 吕遥 | Converter bridge arm suitable for high-voltage applications and application system thereof |
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|---|---|---|---|---|
| CN1818698A (en) * | 2006-03-17 | 2006-08-16 | 中国电力科学研究院 | Experimental method of chain static synchronous compensator IGCT valve |
| CN201956689U (en) * | 2010-12-31 | 2011-08-31 | 中电普瑞科技有限公司 | Bypass structure of chain link unit of static synchronous compensator |
| CN202353227U (en) * | 2011-12-15 | 2012-07-25 | 中电普瑞科技有限公司 | Alternate charging starting circuit for chain circuit static synchronous compensator |
| CN203825115U (en) * | 2014-04-21 | 2014-09-10 | 郭高朋 | Full-power test device of STATCOM sub modules |
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