CN113890072B - Advanced distributed modularized wireless parallel dynamic voltage restorer - Google Patents
Advanced distributed modularized wireless parallel dynamic voltage restorer Download PDFInfo
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- CN113890072B CN113890072B CN202111375491.4A CN202111375491A CN113890072B CN 113890072 B CN113890072 B CN 113890072B CN 202111375491 A CN202111375491 A CN 202111375491A CN 113890072 B CN113890072 B CN 113890072B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 26
- 238000004146 energy storage Methods 0.000 claims abstract description 24
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 24
- 230000009466 transformation Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention provides an advanced distributed modularized wireless parallel dynamic voltage restorer, which can realize redundant design and ensure reliable and stable operation of a system; the DC/AC bidirectional converter comprises a silicon controlled rectifier unit, a DC energy storage unit and a DC/AC bidirectional converter unit, wherein the silicon controlled rectifier unit is connected between a power grid and a load and used for controlling the on-off of the power grid and the load; the direct current energy storage unit is connected with the DC/AC bidirectional converter unit and is used for realizing direct current energy storage; the DC/AC bidirectional converter unit is connected between the controllable silicon unit and the load and is used for direct current boosting and alternating current inversion or alternating current rectification and direct current voltage reduction, the DC/AC bidirectional converter unit comprises a plurality of current converting modules, the current converting modules are connected in parallel, the parallel connection points are used as input ends and are connected with the direct current energy storage unit and the output end of the controllable silicon unit, and a DSP control unit is integrated in each group of current converting modules and is used for sending control signals to the controllable silicon unit to drive the controllable silicon unit to work.
Description
Technical Field
The invention relates to the technical field of electric energy quality management, in particular to an advanced distributed modularized wireless parallel dynamic voltage restorer.
Background
The dynamic voltage restorer is applied to occasions with higher requirements on the power grid voltage, such as the semiconductor industry, production equipment is sensitive to the power grid voltage, tens of millions of yuan loss can be caused by abnormal power grid voltage exceeding 10 milliseconds, the dynamic voltage restorer DVR is specially used for solving the problem, and compared with the traditional UPS scheme, the dynamic voltage restorer is high in efficiency, low in energy consumption, free of maintenance, small in occupied space and free of an additional heat dissipation system, so that a plurality of industries are applied on a large scale.
The main flow scheme of the existing dynamic voltage restorer in the market at present is shown in fig. 1, and the dynamic voltage restorer comprises a silicon controlled rectifier unit, a direct current energy storage unit, a DC/AC bidirectional converter unit and a central control unit, wherein the DC/AC bidirectional converter unit comprises a plurality of converter modules, and the working principle of the DC/AC bidirectional converter unit is as follows: when the power grid is normal, the silicon controlled rectifier unit is conducted, the power grid supplies power to the load through the silicon controlled rectifier unit, when the power grid is abnormal, the silicon controlled rectifier unit is disconnected, the direct current energy storage unit of the dynamic voltage restorer outputs alternating current inversion voltage through the DC/AC bidirectional converter unit to power off the load until the DC/AC bidirectional converter unit stops outputting the alternating current inversion voltage when the power grid is restored to be normal, the silicon controlled rectifier unit is conducted, the power can be continuously supplied to the load through the power grid, and the whole process can ensure that the continuous power supply of the load does not have power failure; but also has the following disadvantages: the prior art of products uniformly controls each converter module in the DC/AC bidirectional converter unit through the central control unit, and the central control unit has no redundant design, so that once the central control unit fails, the whole system breaks down, thereby the dynamic voltage restorer can not work, and the system reliability is very low.
Disclosure of Invention
Aiming at the problems, the invention provides an advanced distributed modularized wireless parallel dynamic voltage restorer which can realize redundant design and ensure reliable and stable operation of a system.
The technical scheme is as follows: an advanced distributed modularized wireless parallel dynamic voltage restorer is arranged between a power grid and a load; the dynamic voltage restorer comprises a silicon controlled rectifier unit, a direct current energy storage unit and a DC/AC bidirectional converter unit, wherein the silicon controlled rectifier unit is connected between the power grid and the load and used for controlling the on-off of the power grid and the load;
the direct current energy storage unit is connected with the DC/AC bidirectional converter unit and is used for realizing direct current energy storage;
the DC/AC bidirectional converter unit is connected between the silicon controlled rectifier unit and the load and is used for direct current boosting and alternating current inversion or alternating current rectification and direct current reduction, and the DC/AC bidirectional converter unit comprises a plurality of conversion modules and is characterized in that: the current transformation modules are connected in parallel, the parallel connection points are used as input ends to be connected with the output ends of the direct current energy storage unit and the controllable silicon unit, and each group of current transformation modules are integrated with a DSP control unit and used for sending control signals to the controllable silicon unit to drive the controllable silicon unit to work.
Further characterized in that:
each group of the current transformation modules comprises capacitors C11-C15, inductors L1, L2 and L3 and switching tubes T1-T12, and the DSP control unit comprises a DSP processor; the gates of the switching tubes T1-T12 are connected to the DSP processor, one end of the capacitor C11 is connected with the collector ends of the switching tubes T7, T8 and T9, and the connection point is used as a parallel operation point X connected with the direct current energy storage unit; one end of the capacitor C12 is connected with the emitter ends of the switching tubes T10, T11 and T12, and the connection point is used as a parallel operation point Y connected with the direct current energy storage unit; the other ends of the capacitors C11 and C12 are connected with the emitter ends of the switching tubes T1, T3 and T5 and one ends of the capacitors C13, C14 and C15; the collector of the switching tube T1 is connected with the collector of the switching tube T2, the collector of the switching tube T3 is connected with the collector of the switching tube T4, and the collector of the switching tube T5 is connected with the collector of the switching tube T6; the emitter of the switching tube T2 is connected with the emitter of the switching tube T7, the collector of the switching tube T10 and one end of the inductor L1, the emitter of the switching tube T4 is connected with the emitter of the switching tube T8, the collector of the switching tube T11 and one end of the inductor L2, and the emitter of the switching tube T6 is connected with the emitter of the switching tube T9, the collector of the switching tube T12 and one end of the inductor L3; the other end of the inductor L1 is connected with the other end of the capacitor C13, and the connection point is used as a parallel operation point A1 connected between the thyristor unit and the load; the other end of the inductor L2 is connected with the other end of the capacitor C14, and the connection point is used as a parallel operation point B1 connected between the thyristor unit and the load; the other end of the inductor L3 is connected with the other end of the capacitor C15, and the connection point is used as a parallel operation point C1 connected between the thyristor unit and the load; the driving output end of the DSP processor is used as a parallel operation point Z connected with the silicon controlled unit;
the multiple groups of converter modules are connected in parallel through parallel connection points X, Y, Z, A1, B1 and C1.
The DC/AC bidirectional converter unit has the beneficial effects that the DC/AC bidirectional converter unit is formed by connecting a plurality of groups of converter modules in parallel, and a DSP control unit is integrated in each group of converter modules, so that when one module fails, the normal operation of the other modules is not influenced, the normal operation of the whole system is ensured, the purposes of automatic redundancy design and distributed control are realized, and the reliable and stable operation of the system can be ensured.
Drawings
FIG. 1 is a block diagram of a prior art dynamic voltage restorer;
FIG. 2 is a block diagram of the structure of the present invention;
figure 3 is a schematic circuit diagram of a current conversion module according to the present invention.
Detailed Description
As shown in fig. 2 and 3, the advanced distributed modular wireless parallel dynamic voltage restorer of the invention is arranged between a power grid and a load; the dynamic voltage restorer comprises a silicon controlled rectifier unit, a direct current energy storage unit and a DC/AC bidirectional converter unit;
the controllable silicon unit is connected between the power grid and the load and used for controlling the on-off of the power grid and the load;
the direct current energy storage unit is connected with the DC/AC bidirectional converter unit and is used for realizing direct current energy storage;
the DC/AC bidirectional converter unit is connected between the silicon controlled rectifier unit and the load and is used for direct current boosting and alternating current inversion or alternating current rectification and direct current voltage reduction;
the DC/AC bidirectional converter unit comprises a plurality of conversion modules for AC/DC bidirectional exchange; the parallel connection is carried out between the current transformation modules, the more the power is, the more the parallel current transformation modules are, the number of the parallel current transformation modules can be set according to actual conditions, the parallel connection points are used as input ends to be connected with the direct current energy storage unit and the output end of the controllable silicon unit, and each group of current transformation modules is integrated with a DSP control unit for sending control signals to the controllable silicon unit and rapidly driving the controllable silicon unit to work.
Each group of converter modules comprises capacitors C11-C15, inductors L1, L2 and L3 and switching tubes T1-T12, and the DSP control unit comprises a DSP processor; the gates of the switching tubes T1-T12 are connected to the DSP processor, one end of the capacitor C11 is connected with the collector ends of the switching tubes T7, T8 and T9, and the connection point is used as a parallel operation point X connected with the direct current energy storage unit; one end of the capacitor C12 is connected with the emitter ends of the switching tubes T10, T11 and T12, and the connection point is used as a parallel operation point Y connected with the direct current energy storage unit; the other ends of the capacitors C11 and C12 are connected with the emitter ends of the switching tubes T1, T3 and T5 and one ends of the capacitors C13, C14 and C15; the collector of the switching tube T1 is connected with the collector of the switching tube T2, the collector of the switching tube T3 is connected with the collector of the switching tube T4, and the collector of the switching tube T5 is connected with the collector of the switching tube T6; the emitter of the switching tube T2 is connected with the emitter of the switching tube T7, the collector of the switching tube T10 and one end of the inductor L1, the emitter of the switching tube T4 is connected with the emitter of the switching tube T8, the collector of the switching tube T11 and one end of the inductor L2, and the emitter of the switching tube T6 is connected with the emitter of the switching tube T9, the collector of the switching tube T12 and one end of the inductor L3; the other end of the inductor L1 is connected with the other end of the capacitor C13, and the connection point is used as a parallel operation point A1 connected between the thyristor unit and the load; the other end of the inductor L2 is connected with the other end of the capacitor C14, and the connection point is used as a parallel operation point B1 connected between the thyristor unit and the load; the other end of the inductor L3 is connected with the other end of the capacitor C15, and the connection point is used as a parallel operation point C1 connected between the thyristor unit and the load; the driving output end of the DSP processor is used as a parallel operation point Z connected with the silicon controlled unit.
Compared with the centralized master-slave control scheme adopted in the existing traditional dynamic voltage restorer, in the traditional technology, the whole system is provided with only one control unit as a master machine, other converter modules are used as slaves for executing tasks, once the control unit fails, the whole system breaks down and can not work, the requirement of high reliability of the dynamic voltage restorer is met, the reliability is lower than that of the dynamic voltage restorer, the dynamic voltage restorer is not needed, and the problem of voltage flicker is solved, so that the problem of larger power failure is brought as a result. In the invention, the control technology of the current transformation modules is adopted, the parallel control of the communication-free lines can be realized through the distributed parallel technology, and the automatic current sharing of the current transformer system can also be realized, that is, when one of the current transformation modules fails, the normal operation of the other current transformation modules is not influenced, and the normal operation of the whole system is ensured, thereby realizing the purposes of automatic redundancy design and distributed control and ensuring the reliable and stable operation of the system.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (1)
1. An advanced distributed modularized wireless parallel dynamic voltage restorer is arranged between a power grid and a load; the dynamic voltage restorer comprises a silicon controlled rectifier unit, a direct current energy storage unit and a DC/AC bidirectional converter unit, wherein the silicon controlled rectifier unit is connected between the power grid and the load and used for controlling the on-off of the power grid and the load;
the direct current energy storage unit is connected with the DC/AC bidirectional converter unit and is used for realizing direct current energy storage;
the DC/AC bidirectional converter unit is connected between the silicon controlled rectifier unit and the load and is used for direct current boosting and alternating current inversion or alternating current rectification and direct current reduction, and the DC/AC bidirectional converter unit comprises a plurality of conversion modules and is characterized in that: the converter modules are connected in parallel, and the parallel connection points are used as input ends to be connected with the output ends of the direct current energy storage unit and the controllable silicon unit, and each group of converter modules is integrated with a DSP control unit which is used for sending control signals to the controllable silicon unit to drive the controllable silicon unit to work; each group of the current transformation modules comprises capacitors C11-C15, inductors L1, L2 and L3 and switching tubes T1-T12, and the DSP control unit comprises a DSP processor; the gates of the switching tubes T1-T12 are connected to the DSP processor, one end of the capacitor C11 is connected with the collector ends of the switching tubes T7, T8 and T9, and the connection point is used as a parallel operation point X connected with the direct current energy storage unit; one end of the capacitor C12 is connected with the emitter ends of the switching tubes T10, T11 and T12, and the connection point is used as a parallel operation point Y connected with the direct current energy storage unit; the other ends of the capacitors C11 and C12 are connected with the emitter ends of the switching tubes T1, T3 and T5 and one ends of the capacitors C13, C14 and C15; the collector of the switching tube T1 is connected with the collector of the switching tube T2, the collector of the switching tube T3 is connected with the collector of the switching tube T4, and the collector of the switching tube T5 is connected with the collector of the switching tube T6; the emitter of the switching tube T2 is connected with the emitter of the switching tube T7, the collector of the switching tube T10 and one end of the inductor L1, the emitter of the switching tube T4 is connected with the emitter of the switching tube T8, the collector of the switching tube T11 and one end of the inductor L2, and the emitter of the switching tube T6 is connected with the emitter of the switching tube T9, the collector of the switching tube T12 and one end of the inductor L3; the other end of the inductor L1 is connected with the other end of the capacitor C13, and the connection point is used as a parallel operation point A1 connected between the thyristor unit and the load; the other end of the inductor L2 is connected with the other end of the capacitor C14, and the connection point is used as a parallel operation point B1 connected between the thyristor unit and the load; the other end of the inductor L3 is connected with the other end of the capacitor C15, and the connection point is used as a parallel operation point C1 connected between the thyristor unit and the load; the driving output end of the DSP processor is used as a parallel operation point Z connected with the silicon controlled unit; the multiple groups of converter modules are connected in parallel through parallel connection points X, Y, Z, A1, B1 and C1.
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| CN114928155A (en) * | 2022-06-16 | 2022-08-19 | 江苏莱提电气股份有限公司 | Hybrid dynamic voltage restorer, power grid maintenance equipment and micro-grid system |
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