CN112671024A - Full-bridge thyristor energy consumption submodule and auxiliary commutation control method - Google Patents
Full-bridge thyristor energy consumption submodule and auxiliary commutation control method Download PDFInfo
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Abstract
The invention provides an embedded full-bridge thyristor energy consumption submodule for inhibiting LCC-HVDC commutation failure and an LCC-HVDC auxiliary commutation control method. Each module consists of four groups of thyristors, capacitors and energy dissipation resistors, wherein each two groups of thyristors are connected in series and are symmetrical left and right, and the capacitors and the energy dissipation resistors are connected at the center. The full-bridge thyristor energy-consumption submodule for inhibiting LCC-HVDC commutation failure is connected in series in a converter valve bridge arm at the inversion side of a high-voltage direct-current transmission system, when a converter valve to be shut down detects that a system fails, a submodule capacitor-resistor branch is put into use, a capacitor provides auxiliary commutation voltage, and an energy-consumption resistor inhibits the increase of fault direct-current, so that the system commutation failure resisting capacity is improved, and the capacitor and the energy-consumption resistor branch are bypassed when the system normally operates, so that active loss is avoided.
Description
Technical Field
The invention relates to an energy consumption submodule in the technical field of high-voltage direct-current power transmission, in particular to a full-bridge thyristor (TED-FBSM) energy consumption submodule and a control method thereof in commutation failure.
Background
The power grid commutation-Converter High Voltage Direct Current (LCC-HVDC) is widely applied in the world by virtue of the advantages of the LCC-HVDC in the aspects of long-distance large-capacity power transmission, active power quick control and the like; however, because a thyristor which cannot be automatically turned off is adopted as a converter device, when an alternating current system fails, a commutation failure may occur on the LCC-HVDC inversion side.
For LCC-HVDC system, during the failure period of AC system, the large drop of AC bus voltage and the large rise of DC current are two main reasons for the failure of phase change of system. Most of the existing auxiliary commutation topologies start from the aspect of providing auxiliary commutation voltage, and the auxiliary commutation effect is limited. According to the invention, the energy consumption submodule of the full-bridge thyristor is connected in series in the bridge arm of the inverter-side converter valve, so that auxiliary phase-changing voltage can be provided for the system, the impedance of the system can be increased to inhibit the increase of transient current, and the probability of phase-changing failure of the system is effectively reduced.
Therefore, the embedded full-bridge thyristor energy consumption submodule for inhibiting LCC-HVDC commutation failure provided by the invention can improve the capability of a direct-current power transmission system for resisting commutation failure, and meanwhile, can continuously keep the power transmission advantages of high capacity and low loss of the original LCC, is flexible in operation of the submodule, and is very important, and the problem of active loss of the system can not be caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an embedded full-bridge thyristor energy consumption submodule for inhibiting LCC-HVDC commutation failure and an auxiliary commutation control method thereof.
The adopted solution for realizing the purpose is as follows:
the utility model provides an restrain embedded full-bridge thyristor power consumption submodule piece of LCC-HVDC commutation failure, full-bridge thyristor power consumption submodule piece includes electric capacity, power consumption resistance and full-bridge thyristor, its characterized in that: the full-bridge thyristor comprises a thyristor group VT1, a thyristor group VT2, a thyristor group VT3 and a thyristor group VT4, wherein the cathode of the thyristor group VT1 is connected with the anode of the thyristor group VT2, and the cathode of the thyristor group VT3 is connected with the anode of the thyristor group VT 4; the anode of the thyristor group VT1 is connected with the anode of the thyristor group VT3 and is used as the input end of the energy consumption submodule, and the cathode of the thyristor group VT2 is connected with the cathode of the thyristor group VT4 and is used as the output end of the energy consumption submodule; two ends of the capacitor C are respectively connected with the cathode of the thyristor set VT1, the anode of the thyristor set VT2 and one end of the energy consumption resistor R; the other end of the energy dissipation resistor is connected with the cathode of the thyristor set VT3 and the anode of the thyristor set VT 4.
Further, each thyristor group is composed of a plurality of thyristors which are connected in series.
Further, the number of thyristors of each thyristor group is determined by the system voltage and the voltage levels of the thyristors.
Furthermore, the modules are connected in series in a bridge arm of a converter valve on the inversion side of the high-voltage direct-current transmission system.
Furthermore, a thyristor is used as a switch, and the input and the removal of the sub-module capacitor and the energy consumption resistor are realized by controlling the full bridge of the thyristor.
In addition, the invention also provides an LCC-HVDC auxiliary commutation control method:
an embedded full-bridge thyristor energy consumption submodule according to any one of claims 1-3 is connected in series in a bridge arm of a converter valve on the inversion side of the high-voltage direct-current transmission system; the switching-on and switching-off of the thyristor group are controlled through the trigger pulse to realize the input and the cut-off of the sub-module capacitor and the energy consumption resistor.
Further, when the high voltage direct current system is started, the capacitor C is precharged, a trigger pulse is applied to the thyristor group VT3 and VT2 to turn on the thyristor group VT3 and VT2, the capacitor is charged, after the capacitor is charged to a set voltage, the trigger pulse is applied to the thyristor group VT1 to turn on the thyristor group VT3, the thyristor group VT3 is turned off due to the reverse voltage, and the module is in a normal operating state.
Further, when a system fault is detected and the converter valve to be shut down needs to be put in a sub-module capacitor C and an energy consumption resistor R for auxiliary phase conversion, a trigger pulse is applied to a thyristor group VT4 to enable the thyristor group VT4 to be switched on, the thyristor group VT2 is cut off due to the fact that back pressure is borne, the capacitor discharges until the voltage is zero, the capacitor is charged reversely, when the capacitor is charged to a negative set value, the shut-off current of the converter valve of the valve arm is just attenuated to 0, the whole valve arm is shut off, and sub-module capacitors and energy consumption resistor branches are cut off. When the valve arm converter valve is conducted again, a trigger pulse is applied to the sub-module thyristor VT3, the thyristor group VT1 is in a turn-off state due to the fact that the thyristor group bears the capacitor back pressure, the sub-module capacitor and the energy consumption resistor branch are bypassed, when the valve arm converter valve is turned off again, the thyristor group VT2 is triggered and conducted, the thyristor group VT4 bears the capacitor back pressure and is gradually turned off, the sub-module capacitor and the energy consumption resistor are put into use, when the current of the valve arm converter valve is attenuated to 0, the sub-module capacitor and the resistor branch are cut off when the whole valve arm is turned off, and the quick turn-off process of the sub-module capacitor and the resistor is repeatedly carried out during a fault until.
Further, after the fault is eliminated, the resistor R needs to be cut off, when the converter valve current of the valve arm is attenuated to 0, the capacitor C of the submodule is reversely charged after the whole valve arm is turned off, the submodule triggers and conducts the thyristor group VT2 or the thyristor group VT4, the branch of the capacitor C and the resistor R is bypassed, and the submodule is in a normal working state.
Compared with the prior art, the invention has the following beneficial effects:
1. the embedded full-bridge thyristor energy consumption submodule for inhibiting LCC-HVDC commutation failure is suitable for traditional high-voltage direct-current power transmission, can reduce the probability of commutation failure of direct-current power transmission, and improves the running stability of an alternating-current and direct-current system.
2. According to the embedded full-bridge thyristor energy-consumption submodule for inhibiting LCC-HVDC commutation failure, auxiliary commutation voltage can be provided for a system through capacitor charging and discharging during failure, meanwhile, transient electric energy can be consumed by the resistor to inhibit the increase of direct current, and the submodule has a good auxiliary commutation effect.
3. The embedded full-bridge thyristor energy-consumption submodule for inhibiting LCC-HVDC commutation failure can flexibly control the input and the removal of a submodule capacitor C and an energy-consumption resistor R, and adopts a thyristor as a power electronic switch device, so that the use cost is low.
4. According to the embedded full-bridge thyristor energy-consumption submodule for inhibiting LCC-HVDC commutation failure, the energy-consumption resistor is only put into the converter valve to be turned off during the fault period, the heat generated by the resistor is limited, the normal operation of the resistor cannot be influenced, and an additional heat-radiating device is not required to be installed.
5. The embedded full-bridge thyristor energy consumption submodule for inhibiting LCC-HVDC commutation failure can realize capacitor self-charging under the condition of not needing an external power supply.
6. The embedded full-bridge thyristor energy consumption submodule for inhibiting LCC-HVDC commutation failure provided by the invention can improve the capability of LCC-HVDC in resisting commutation failure under the conditions of single-phase failure, three-phase asymmetry and the like of an alternating current system.
Drawings
FIG. 1 is an embedded full-bridge thyristor energy-consuming submodule topology structure for suppressing LCC-HVDC commutation failure provided by the invention;
FIG. 2 is a topological diagram of a full-bridge thyristor energy-consumption submodule according to the invention;
FIG. 3 shows 6 operating modes of the full-bridge thyristor energy-consuming submodule in the embodiment of the present invention;
fig. 4 is a phase commutation circuit diagram of the working equivalent of the full-bridge thyristor energy-consumption submodule provided by the invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The invention provides an embedded full-bridge thyristor energy consumption submodule for inhibiting LCC-HVDC commutation failure, as shown in figure 1, the device is connected in series in a bridge arm of a converter valve at the inversion side of a high-voltage direct-current transmission system.
As shown in fig. 2, the full-bridge thyristor power consumption submodule includes a capacitor, a resistor and a full-bridge thyristor. The full-bridge thyristor consists of four thyristor groups VT1-VT4, each thyristor group consists of a plurality of thyristors which are connected in series, the number of the thyristors is determined according to the system voltage and the voltage level of the thyristors, for example, when the system voltage is 30KV, 7 thyristors with the voltage level of 7.2KV can be selected to be connected in series to form each thyristor group; the cathode of the thyristor set VT1 is connected with the anode of the thyristor set VT2, and the cathode of the thyristor set VT3 is connected with the anode of the thyristor set VT 4; the anode of the thyristor set VT1 is connected with the anode of the thyristor set VT3, and the cathode of the thyristor set VT2 is connected with the cathode of the thyristor set VT 4; two ends of the capacitor C are respectively connected with the cathode of the thyristor set VT1, the anode of the thyristor set VT2 and one end of the energy consumption resistor R; the other end of the energy dissipation resistor is connected with the cathode of the thyristor set VT3 and the anode of the thyristor set VT 4. The module utilizes the thyristor as a switch, and the input and the removal of the energy consumption resistor can be realized by controlling the full bridge of the thyristor. When the system has a fault, the submodule capacitor C and the energy consumption resistor R are added into the converter valve to be shut down for auxiliary commutation, so that the capability of the direct-current transmission system for resisting commutation failure is improved. After the fault is eliminated, the sub-module is restored to the normal operation state, namely the bypass capacitor C and the resistor, so that the interference to the normal operation of the system is avoided.
Coordinated control of thyristor full-bridge energy consumption submodule
The operation process of the sub-modules can be divided into four working states:
the working state I is as follows: as shown in fig. 3(a), when the system is started, the capacitor C needs to be precharged first, so as to prepare for switching the energy consumption branch of the resistor into the thyristor to be turned off forcibly. Trigger pulses need to be applied to the thyristor group VT3 and the thyristor group VT2 at the same time, at this time, current flows through the thyristor VT3, the capacitor C, the resistor R and the thyristor group VT2 in sequence, the capacitor is charged, at this time, the potential stored by the capacitor is negative on the left and positive on the right, and the process corresponds to the working mode 1 of the submodule.
And a second working state: as shown in fig. 3(b), when the capacitor is charged to the set voltage, a trigger pulse is applied to the thyristor set VT1, the thyristor set VT3 is turned off by receiving a reverse voltage, a current flows through the thyristor set VT1 and the thyristor set VT2 in sequence, the capacitor and the resistor are bypassed, and the module is in a normal operating state, which corresponds to the operating mode 2 shown in fig. 3 (b).
And a third working state: as shown in fig. 3(C), when the ac system fails, the sub-module capacitor C and the resistor R are required to be added to the converter valve to be turned off for auxiliary phase change, at this time, a trigger pulse needs to be applied to the thyristor set VT4, the thyristor set VT2 is subjected to a reverse voltage and is turned off, and a current flows through the thyristor set VT1, the capacitor C, the resistor R, and the thyristor set VT4 in sequence, which corresponds to the sub-module operation mode 3, where the capacitor discharges and the resistor consumes energy. After the capacitor is discharged, reverse charging is started, when the capacitor is charged to a negative rated set value, the voltage polarity of the sub-module capacitor is changed to positive left and negative right, as shown in a mode 4 corresponding to fig. 3(d), a trigger pulse is applied to the thyristor group VT2, the thyristor group VT4 bears reverse voltage and is cut off, current flows through the thyristor VT1 and the thyristor VT2 in sequence, and a current flow path is shown in a mode 5 corresponding to fig. 3 (e); when the valve arm is detected to be in an off state again, the thyristor set VT2 is triggered to be turned on, the thyristor set VT4 is gradually turned off due to the back voltage, the current flow path is the thyristor set VT3, the resistor R, the capacitor C, the thyristor set VT2, the capacitor C discharges, the resistor R consumes energy, the process is shown in (f) mode 6 in fig. 3, and then the submodule works between mode 1 and mode 6 again until the fault is cleared. Until the fault clears.
And the working state is four: when the fault of the system is eliminated, the capacitor C and the resistor R need to be cut off, according to the control strategy of the embedded full-bridge thyristor energy-consuming submodule, the sub-module capacitor C and the resistor R branch are put into the shutdown process of the valve arm converter valve, when the current of the valve arm converter valve is attenuated to 0 and the whole valve arm is completely shut off, the sub-module triggers and conducts the thyristor group VT2 (the polarity of the sub-module capacitor voltage is positive left and right negative) or the thyristor group VT4 (the polarity of the sub-module capacitor voltage is negative left and positive right) to bypass the capacitor C and the resistor R branch, and the sub-module works in the working mode 2 shown in fig. 3(b) or the working mode 5 shown in fig. 3 (e).
It should be noted that the above topology is a symmetric structure, so the polarity of the capacitor voltage will be different when the circuit of the final capacitor and resistor is cut off, and when the next fault comes on, the sub-module will determine whether the working state sequence of the sub-module is (c) - (d) - (e) - (f) - (a) - (b) - (c) - (d) according to the polarity of the capacitor voltage. In order to prevent the capacitor from being broken down as a result of the submodule capacitor being charged to an overvoltage in the event of a phase commutation failure, a capacitor charging limit value is provided, at which the submodule capacitor is bypassed when the capacitor voltage reaches the limit value.
In this embodiment, the thyristor groups VT1 to VT4 of the module adopt a structure in which a plurality of thyristors are connected in series, and the plurality of thyristors connected in series are regarded as a whole to control the simultaneous triggering thereof.
The working mechanism of the full-bridge thyristor energy dissipation submodule is as follows:
as shown in fig. 4, after a full-bridge thyristor energy-consuming submodule is connected in series in an inverter-side converter valve, taking a valve 3 to a valve 5 for phase conversion as an example, an equivalent phase-converting circuit of a system can be drawn, when a fault of the system is detected, a capacitor and an energy-consuming resistor are put into a bridge arm to be turned off by adjusting the switching state of the submodule, the capacitor is charged and discharged to provide an auxiliary phase-converting voltage, the phase-converting voltage-time area of the converter valve is increased, the energy-consuming resistor increases the impedance value of a phase-converting loop to inhibit the increase of direct current, consumes fault electric energy to accelerate the attenuation of fault current and increase the turn-off angle margin, and further improves the immunity of system phase.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the present application and not for limiting the protection scope thereof, and although the present application has been described in detail with reference to the above-mentioned embodiments, a person skilled in the art can make various changes, modifications or equivalents to the specific embodiments of the application after reading the present application, but these changes, modifications or equivalents are all within the protection scope of the claims of the application pending.
Claims (9)
1. The utility model provides an restrain embedded full-bridge thyristor power consumption submodule piece of LCC-HVDC commutation failure, full-bridge thyristor power consumption submodule piece includes electric capacity, power consumption resistance and full-bridge thyristor, its characterized in that: the full-bridge thyristor comprises a thyristor group VT1, a thyristor group VT2, a thyristor group VT3 and a thyristor group VT4, wherein the cathode of the thyristor group VT1 is connected with the anode of the thyristor group VT2, and the cathode of the thyristor group VT3 is connected with the anode of the thyristor group VT 4; the anode of the thyristor group VT1 is connected with the anode of the thyristor group VT3 and is used as the input end of the energy consumption submodule, and the cathode of the thyristor group VT2 is connected with the cathode of the thyristor group VT4 and is used as the output end of the energy consumption submodule; two ends of the capacitor C are respectively connected with the cathode of the thyristor set VT1, the anode of the thyristor set VT2 and one end of the energy consumption resistor R; the other end of the energy dissipation resistor is connected with the cathode of the thyristor set VT3 and the anode of the thyristor set VT 4.
2. The embedded full-bridge thyristor energy-consuming submodule for suppressing LCC-HVDC commutation failure of claim 1, wherein: each thyristor group is formed by connecting a plurality of thyristors in series.
3. The embedded full-bridge thyristor energy-consuming submodule for suppressing LCC-HVDC commutation failure of claim 2, wherein: the number of thyristors of each thyristor group is determined by the system voltage and the voltage levels of the thyristors.
4. The embedded full-bridge thyristor energy-consuming submodule for suppressing LCC-HVDC commutation failure as claimed in any of claims 1-3, wherein: the modules are connected in series in a converter valve bridge arm on the inversion side of the high-voltage direct-current transmission system.
5. The embedded full-bridge thyristor energy-consuming submodule for suppressing LCC-HVDC commutation failure as claimed in any of claims 1-4, wherein: the thyristor is used as a switch, and the input and the removal of the sub-module capacitor and the energy consumption resistor are realized by controlling the full bridge of the thyristor.
6. An LCC-HVDC auxiliary commutation control method is characterized in that: an embedded full-bridge thyristor energy consumption submodule according to any one of claims 1-3 is connected in series in a bridge arm of a converter valve on the inversion side of the high-voltage direct-current transmission system; the switching-on and switching-off of the thyristor group are controlled through the trigger pulse to realize the input and the cut-off of the sub-module capacitor and the energy consumption resistor.
7. The LCC-HVDC auxiliary commutation control method of claim 6, wherein: when the high-voltage direct-current system is started, the capacitor C is precharged, firstly, a trigger pulse is applied to the thyristor groups VT3 and VT2 to enable the thyristor groups VT3 and VT2 to be conducted, the capacitor is charged, after the capacitor is charged to a set voltage, the trigger pulse is applied to the thyristor group VT1 to enable the thyristor group VT 3526 to be conducted, the thyristor group VT3 is cut off due to the fact that the reverse voltage is borne, and the module is in a normal working state.
8. The LCC-HVDC assisted commutation control method of claim 7, wherein: when a system is detected to have a fault, a submodule capacitor C and an energy consumption resistor R are required to be added for auxiliary commutation for a converter valve to be shut off, a trigger pulse is applied to a thyristor group VT4 to enable the thyristor group VT4 to be switched on, the thyristor group VT2 is cut off due to the fact that back pressure is borne, the capacitor discharges until the voltage is zero, the capacitor is charged reversely, when the capacitor is charged to a negative set value, the shut-off current of the converter valve of the valve arm is just attenuated to 0, the whole valve arm is shut off, and the submodule capacitor and the energy consumption resistor branch are cut off. When the valve arm converter valve is conducted again, a trigger pulse is applied to the sub-module thyristor VT3, the thyristor group VT1 is in a turn-off state due to the fact that the thyristor group bears the capacitor back pressure, the sub-module capacitor and the energy consumption resistor branch are bypassed, when the valve arm converter valve is turned off again, the thyristor group VT2 is triggered and conducted, the thyristor group VT4 bears the capacitor back pressure and is gradually turned off, the sub-module capacitor and the energy consumption resistor are put into use, when the current of the valve arm converter valve is attenuated to 0, the sub-module capacitor and the resistor branch are cut off when the whole valve arm is turned off, and the quick turn-off process of the sub-module capacitor and the resistor is repeatedly carried out during a fault until.
9. The LCC-HVDC assisted commutation control method of claim 8, wherein: after the fault is eliminated, the resistor R needs to be cut off, when the current of the converter valve of the valve arm is attenuated to 0, the reverse charging of the capacitor C of the submodule is finished after the whole valve arm is turned off, the submodule triggers and conducts the thyristor group VT2 or the thyristor group VT4, the branch circuits of the capacitor C and the resistor R are bypassed, and the submodule is in a normal working state.
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| CN108767885A (en) * | 2018-04-03 | 2018-11-06 | 国家电网有限公司 | Dynamic is let out can device, equipment and DC transmission system |
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