CN211351704U - Direct current energy consumption device - Google Patents
Direct current energy consumption device Download PDFInfo
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- CN211351704U CN211351704U CN201921916004.9U CN201921916004U CN211351704U CN 211351704 U CN211351704 U CN 211351704U CN 201921916004 U CN201921916004 U CN 201921916004U CN 211351704 U CN211351704 U CN 211351704U
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- 238000005265 energy consumption Methods 0.000 title claims abstract description 156
- 238000004146 energy storage Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 34
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
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- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Abstract
The utility model relates to a direct current power consumption device, the device include at least one power consumption unit, and each power consumption unit establishes ties, power consumption unit includes power consumption branch road and two at least power consumption submodule pieces, power consumption branch road is established ties by first switch device and power consumption resistance and is constituteed, and every power consumption submodule piece includes energy storage electric capacity, and each power consumption submodule piece input is established ties, the parallelly connected back of output of each power consumption submodule piece with the power consumption branch road is connected. The utility model discloses avoided the inconsistent device that leads to of opening to damage the risk in the direct series connection scheme of power semiconductor device, power discharge period direct current voltage stability is good, can also reduce the power impact of discharge in-process, and a plurality of power consumption submodule pieces share an energy consumption branch road, have simplified the device structure greatly, have reduced system cost.
Description
Technical Field
The utility model belongs to the technical field of high-voltage direct current transmission, concretely relates to direct current power consumption device.
Background
The flexible direct current transmission technology has the advantages of no commutation failure, low voltage harmonic content, high waveform quality, capability of quickly adjusting active power and reactive power and the like. Due to the technical advantages, the flexible direct current technology generates wide application requirements in a power system, such as access, collection and transmission of large-scale clean energy and power supply of island passive loads. When the flexible direct current is applied to a new energy system to be sent out, when a power receiving end breaks down to cause voltage drop of an alternating current power grid, active power cannot be sent out or only can be partially sent out to the alternating current power grid, surplus active power causes voltage rise of a direct current transmission line, and safety of equipment such as a flexible direct current converter valve is damaged.
In the prior art, a method is adopted, in which power semiconductor devices are directly connected in series, when a direct current voltage is too high, a resistor is put in through the control of a power electronic device, the direct current voltage is reduced due to the input of the resistor, when the energy consumption speed of the resistor exceeds the speed of accumulating energy at a direct current side, the direct current voltage is reduced, a resistor discharge loop is turned off, the direct current voltage is increased again, and the direct current voltage is controlled by repeatedly turning on and off a resistor branch, and the method mainly has the following problems: when the power semiconductor switch device is turned off, the technical difficulty exists in simultaneous turning off of a plurality of power semiconductor switch devices, consistency is difficult to guarantee, and once the turning-off is asynchronous, a device which is turned on slowly or a device which is turned off quickly bears overvoltage and is damaged.
Although some direct current energy consumption devices can solve the problem that the power semiconductor switch devices are damaged due to asynchronous turn-off, the devices are complex in structure and high in cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current power consumption device solves current direct current power consumption device and when solving the problem that power semiconductor switch device turn-off asynchronous lead to the device to damage, and the structure is complicated, problem with high costs.
In order to solve the technical problem, the utility model discloses a direct current power consumption device includes at least one power consumption unit, and each power consumption unit establishes ties, power consumption unit includes power consumption branch road and two at least power consumption submodule pieces, power consumption branch road is established ties by first switch device and power consumption resistance and is constituteed, and every power consumption submodule piece includes energy storage electric capacity, and each power consumption submodule piece input is established ties, after each power consumption submodule piece's output is parallelly connected with the power consumption branch road is connected.
The utility model discloses a direct current power consumption device has avoided the inconsistent device that leads to of opening to damage the risk in the direct series connection scheme of power semiconductor device, and direct voltage stability is good during the power is let out, can also reduce the power impact of letting out the in-process. The energy consumption unit in the device adopts a modularized mode, the production and manufacturing difficulty and the engineering implementation difficulty of the device are greatly reduced, the operation reliability of the device is improved, the convenience and the benefit of maintenance are improved, and the device is easy to expand to application occasions with higher voltage level and larger capacity. And a plurality of energy consumption sub-modules share one energy consumption branch circuit, so that the structure of the device is greatly simplified, and the system cost is reduced.
In order to prevent the energy storage capacitor from discharging to the direct current line, the energy consumption submodule further comprises a diode, and the diode is connected to the input end of the energy consumption submodule in series.
In order to isolate each energy storage capacitor, discharge between the energy storage capacitors is prevented when power is discharged, and a follow current loop is formed by the follow current diodes in the energy consumption branch circuits, and clamping diodes are serially arranged on the output ends of the energy consumption sub-modules.
In order to facilitate switching of the energy consumption sub-module, the energy consumption sub-module further comprises a second switch device, and the second switch device is connected with the energy storage capacitor in parallel.
In order to facilitate the removal of the failed energy consuming submodule, the energy consuming submodule further comprises a first bypass switch, and the first bypass switch is connected with the energy storage capacitor in parallel.
In order to improve the static voltage-sharing effect of the energy storage capacitor in the module, the energy consumption submodule further comprises a voltage-sharing resistor, and the voltage-sharing resistor is connected to two ends of the energy storage capacitor in parallel.
In order to facilitate switching of the energy consumption unit, a third switching device is connected in parallel to two ends of the energy consumption unit.
In order to facilitate the removal of the failed energy consumption unit, two ends of the energy consumption unit are connected in parallel with a second bypass switch.
In order to improve the reliability of the apparatus, a freewheeling diode is connected in parallel to the first switching device and the second switching device.
In order to improve the reliability of the device, a freewheeling diode is connected in parallel to the energy dissipation resistor.
Drawings
Fig. 1 is a structural diagram of a dc energy dissipation device of the present invention;
fig. 2 is a schematic circuit diagram of the dc energy dissipation device of the present invention;
fig. 3 is a circuit structure diagram of an energy consumption unit of the present invention;
fig. 4 is a circuit structure diagram of another energy consumption unit of the present invention;
fig. 5 is a circuit structure diagram of an energy consumption submodule of the present invention;
fig. 6 is a circuit diagram of another energy-consuming sub-module according to the present invention;
FIG. 7 is a flow chart of the pressure-equalizing control of the pressure-dividing module according to the present invention;
fig. 8 is a control block diagram of the dc energy dissipation device of the present invention;
in the figure: 1-energy consumption unit, 2-energy consumption branch, 3-energy consumption submodule, 4-energy storage capacitor, 5-switching device, 6-bypass switch, 7-first clamping diode, 8-second clamping diode, 9-energy consumption switch, 10-energy consumption resistor, 11-diode, 12-voltage-sharing resistor and 13-isolating switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
The utility model discloses a direct current power consumption device includes at least one power consumption unit, and each power consumption unit establishes ties and constitutes, power consumption unit includes the power consumption branch road, power consumption branch road is established ties by first switch device and power consumption resistance and is constituteed, power consumption unit still includes two at least power consumption submodule pieces, and every power consumption submodule piece includes energy storage electric capacity, and each power consumption submodule piece input series connection, every power consumption submodule piece's output is parallelly connected, parallelly connected back with the power consumption branch road is connected.
As shown in FIG. 1, the DC energy consumption device includes N energy consumption units, N is greater than or equal to 1, and each energy consumption unit is connected in series. The internal structure of the energy consumption unit 1 is described as an example. The energy consumption unit 1 comprises an energy consumption branch 2 and two energy consumption sub-modules 3, the energy consumption branch 2 is composed of an energy consumption switch device 9 and an energy consumption resistor 10, each energy storage unit 3 comprises an energy storage capacitor, the input ends of the two energy consumption sub-modules are connected in series, and the output ends of the two energy consumption sub-modules are connected in parallel and then connected with the energy consumption branch. In fig. 1, two energy consumption submodules are included in the energy consumption unit, but as other embodiments, 3, 4, … …, etc. may be provided.
In order to prevent the energy storage capacitor from discharging to the direct current system, the input end of each energy consumption submodule is also connected with a diode in series. As shown in fig. 2, the diode 11 in the energy consuming submodule 3 is serially connected to the input end of the energy consuming submodule 3, the negative electrode of the diode 11 is connected to the positive electrode of the energy storage capacitor 4, and the positive electrode of the diode 11 is connected to the positive input end of the energy consuming submodule 3.
In order to keep apart energy storage capacitor, the utility model discloses an energy consumption unit still includes the clamp diode, and the clamp diode set up the number the same with the number of energy consumption submodule piece, and the clamp diode is established in the output of energy consumption submodule piece in cluster respectively to discharge each other between two energy storage capacitor in the prevention energy consumption unit. As shown in fig. 2, the energy consumption unit 3 includes two clamping diodes, namely a clamping diode 7 and a clamping diode 8, the clamping diode 7 is serially arranged at the output end of the first energy consumption sub-module, the clamping diode 8 is serially arranged at the output end of the second energy consumption sub-module, specifically, the clamping diode 7 is serially arranged at the negative output end of the first energy consumption sub-module, and the cathode of the clamping diode 7 is connected to the negative electrode of the energy storage capacitor in the first energy consumption sub-module; and the clamping diode 8 is connected in series at the positive output end of the second energy consumption submodule, and the anode of the clamping diode 8 is connected with the anode of the energy storage capacitor in the second energy consumption submodule.
In order to facilitate switching of the energy consumption sub-modules, a switch device can be arranged in the energy consumption sub-modules and connected with the energy storage capacitor in parallel. As shown in fig. 2, the switching device 5 is connected in parallel to two ends of the energy storage capacitor 4, when the switching device 5 is closed, the energy consumption sub-module 3 is cut off, and when the switching device 5 is opened, the energy consumption sub-module 3 is put into use.
In order to improve the static voltage-sharing effect of the module capacitor, a voltage-sharing resistor can be arranged in the energy-consuming submodule and connected to two ends of the energy-storing capacitor in parallel. As shown in fig. 2, the voltage equalizing resistor 12 is connected in parallel across the energy storage capacitor 4.
When the energy consumption sub-module fails, in order to isolate the fault, a bypass switch can be arranged in the energy consumption sub-module, the bypass switch is connected in parallel with two ends of the energy storage capacitor, and when the energy consumption sub-module fails, the energy consumption sub-module is bypassed to isolate the fault. As shown in fig. 2, the bypass switch 6 is connected in parallel to two ends of the energy storage capacitor 4, and when the bypass switch 6 is closed, the energy consuming sub-module 3 bypasses.
And the two ends of the energy consumption unit can be connected with the switch devices in parallel and used for switching the whole energy consumption unit, when the switch devices are closed, the energy consumption unit is cut off, and when the switch devices are opened, the energy consumption unit is put into use. As shown in fig. 3, the energy consumption unit 3 has a switching device 5 connected in parallel to both ends.
And bypass switches can be connected in parallel at two ends of the energy consumption unit and used for bypassing the whole energy consumption unit to isolate faults when the energy consumption unit fails. As shown in fig. 3-4, a bypass switch 6 is connected in parallel to the two ends of the energy consumption unit 3.
The switching device may be a power switching device connected in parallel with a freewheeling diode. The energy dissipation resistor can also be connected with a freewheeling diode in parallel. The dc energy dissipation device is connected to the positive and negative poles of the dc line through the isolation switch, as shown in fig. 2, an isolation switch 13 is disposed between the dc energy dissipation device and the positive and negative poles of the dc line. And controlling whether the direct current energy consumption device is put into operation or not by controlling the on-off of the isolating switch 13.
The utility model provides a DC power consumption device's preferred embodiment, as shown in FIG. 2, DC power consumption device comprises at least one power consumption unit series connection, contain first power consumption submodule piece, second power consumption submodule piece, first clamp diode 7, second clamp diode 8, a power consumption resistance 10 and a power consumption switch 9 in the power consumption unit. The first energy consumption submodule and the second energy consumption submodule are composed of a power semiconductor switch device 5, a diode 11, a voltage-sharing resistor 12, a direct current capacitor 4 and a bypass switch 6; wherein, the emitter of the power semiconductor device 5 is connected with the cathode of the direct current capacitor 4, and the collector is connected with the anode of the diode 11; the cathode of the diode 11 is connected with the anode of the direct current capacitor 4; the bypass switch 6 and the voltage-sharing resistor 12 are connected with the power semiconductor device 5 in parallel;
the emitting electrode of the energy consumption switch 9 is connected with the anode of the energy consumption resistor 10; the energy consumption resistor 10 is connected with a diode in parallel to serve as a follow current unit; the negative electrode of a direct current capacitor 4 in the first energy consumption submodule is connected with the negative electrode of a first clamping diode 7, and the positive electrode of the first clamping diode 7 is connected with the negative electrode of an energy consumption resistor; the positive electrode of a direct current capacitor 4 in the first energy consumption submodule is connected with the collector electrode of the energy consumption power switch; the negative electrode of the direct current capacitor 4 in the second energy consumption submodule is connected with the negative electrode of the energy consumption resistor 10; the anode of the direct current capacitor 4 in the second energy consumption submodule is connected with the anode of a second clamping diode 8, and the cathode of the second clamping diode 8 is connected with the collector of an energy consumption power switch 9;
a collector electrode of the power semiconductor device 5 in the first energy consumption submodule is used as an anode leading-out point of the energy consumption unit; an emitting electrode of the power semiconductor device 5 in the second energy consumption submodule is used as a negative electrode leading-out point of the energy consumption unit; and the cathode leading-out point of the power semiconductor device 5 in the first energy consumption submodule is connected with the anode leading-out point of the power semiconductor device 5 in the second energy consumption submodule.
Of course, the energy consuming sub-module may have other embodiments than the structure shown in fig. 2, such as the structures shown in fig. 5 and 6. The structure of fig. 5 is provided with one more switching device, and is suitable for the situation that the positive pole and the negative pole of the direct current line are changed. In the circuit structure shown in fig. 6, the switching device is connected in series with the dc capacitor, so that when the circuit structure is in the energy consumption mode, the switching device is turned on, the energy consumption sub-module is put into energy consumption, and when the switching device is turned off, the energy consumption sub-module is cut off.
The following explains the starting method of the dc energy consuming device by taking the dc energy consuming device shown in fig. 2 as an example:
step 1: turning off power semiconductor switching devices 5 of energy consumption sub-modules in all energy consumption units; the energy consumption switches 9 in all the energy consumption units are turned off;
step 2: and after the direct current circuit is electrified, the first energy consumption sub-module and the second energy consumption sub-module in the energy consumption unit are charged. After the unit starts to charge, voltage-sharing control needs to be carried out on the unit according to the step 3.
And step 3: the disconnection of a power semiconductor device of an energy consumption submodule in an energy consumption unit is defined as the input state of the energy consumption submodule, and the connection of the power semiconductor device of the energy consumption submodule is defined as the cutting state of the energy consumption submodule;
the voltage of the energy consumption sub-modules in all the energy consumption units is detected in real time and sequenced, and the energy consumption sub-modules with higher voltage and the set number among the N energy consumption sub-modules connected in series in the loop are cut off, so that voltage-sharing control is realized; the real-time detection here means detection every other control period.
And 4, step 4: after the average voltage of all energy consumption sub-modules in the energy consumption unit reaches a set value, the starting process is finished, and the energy consumption device enters a standby state; in the standby state, the voltage equalization control of step 3 needs to be continuously executed.
The following explains the control method of the dc energy consuming device by taking the dc energy consuming device shown in fig. 2 as an example:
step 1: the device detects the voltage of the direct current line in real time, and when the voltage of the direct current line does not exceed the upper limit value Umax, the device is in a standby state and executes the voltage-sharing control in the step 3 in the starting method; when the voltage of the direct current line exceeds an upper limit value Umax, the device enters an energy consumption mode and executes the step 2;
step 2: and performing constant direct current line voltage control through a PI controller, wherein the instruction of the controller is the specified direct current line voltage in the discharge period, the input feedback value is the actual direct current line voltage, and the output quantity of the controller is multiplied by-1 and rounded to obtain the input number Nx of the energy consumption resistors. Detecting the voltages of energy consumption sub-modules in all energy consumption units in real time, averaging the voltages of the two energy consumption sub-modules, sequencing, closing energy consumption switches in Nx energy consumption units with higher voltages, and discharging power;
and step 3: and detecting the voltage of the direct current line, exiting the energy consumption mode when the voltage of the direct current line is less than a lower limit value Umin, disconnecting energy consumption power switches in all energy consumption units, and entering a standby mode.
For example, the dc energy consuming device is connected to a 400kV dc line, and includes 130 energy consuming units (260 energy consuming submodules). In the standby mode, the voltages of the energy consumption sub-modules in the energy consumption unit are sequenced in real time, the N energy consumption sub-modules with higher voltages are cut off, and the voltage-sharing control of the modules is realized, and the flow chart of the voltage-sharing control is shown in fig. 7. When the voltage exceeds 1.1pu rated voltage (namely Umax is 440kV), entering an energy consumption mode, calculating the input quantity of energy consumption resistors to be Nx by using a PI controller, closing energy consumption power switches in Nx energy consumption units with higher voltage, and discharging power; when the voltage is less than the rated voltage of 1pu (i.e., Umin ═ 400kV), the energy consumption mode exits, the energy consumption power switching devices in all the energy consumption units are disconnected, and the control block diagram is as shown in fig. 8 when the standby mode is returned.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The direct-current energy consumption device is characterized by comprising at least one energy consumption unit, wherein the energy consumption units are connected in series, each energy consumption unit comprises an energy consumption branch circuit and at least two energy consumption sub-modules, the energy consumption branch circuit is formed by connecting a first switch device and an energy consumption resistor in series, each energy consumption sub-module comprises an energy storage capacitor, the input ends of the energy consumption sub-modules are connected in series, and the output ends of the energy consumption sub-modules are connected in parallel and then connected with the energy consumption branch circuits.
2. The dc energy consuming device of claim 1, wherein the energy consuming submodule further comprises a diode, and the diode is connected in series to an input terminal of the energy consuming submodule.
3. The dc energy dissipation device of claim 2, wherein a clamp diode is connected in series with the output of the energy dissipation submodule.
4. The direct current energy consumption device according to any one of claims 1 to 3, wherein the energy consumption submodule further comprises a second switching device, and the second switching device is connected in parallel with the energy storage capacitor.
5. The direct current energy consumption device according to any one of claims 1 to 3, wherein the energy consumption submodule further comprises a first bypass switch, and the first bypass switch is connected in parallel with the energy storage capacitor.
6. The direct current energy consumption device according to any one of claims 1 to 3, wherein the energy consumption submodule further comprises a voltage-sharing resistor, and the voltage-sharing resistor is connected in parallel to two ends of the energy storage capacitor.
7. The direct current energy consumption device according to claim 1, wherein a third switching device is connected in parallel to two ends of the energy consumption unit.
8. The dc energy consuming device of claim 1, wherein a second bypass switch is connected in parallel across the energy consuming unit.
9. The dc energy consuming device of claim 1, wherein the first and second switching devices are connected in parallel with freewheeling diodes.
10. The direct current energy consumption device according to claim 1, wherein a freewheeling diode is connected in parallel to the energy consumption resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921916004.9U CN211351704U (en) | 2019-11-07 | 2019-11-07 | Direct current energy consumption device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921916004.9U CN211351704U (en) | 2019-11-07 | 2019-11-07 | Direct current energy consumption device |
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| CN211351704U true CN211351704U (en) | 2020-08-25 |
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| CN201921916004.9U Active CN211351704U (en) | 2019-11-07 | 2019-11-07 | Direct current energy consumption device |
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