CN216489758U - Nonlinear damping resistance device - Google Patents
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- CN216489758U CN216489758U CN202122724754.XU CN202122724754U CN216489758U CN 216489758 U CN216489758 U CN 216489758U CN 202122724754 U CN202122724754 U CN 202122724754U CN 216489758 U CN216489758 U CN 216489758U
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Abstract
The application discloses nonlinear damping resistance device includes: main arc suppression coil L1110 and an active slave arc suppression coil L2120, wherein the active slave arc suppression coil L2120 comprises: the cascaded H bridge inverter 121, the filter inductor 122 and the direct current power supply group 123; wherein, the DC power supply group 123 and the active slave arc suppression coil L2120 connection, main arc suppression coil L1110 and active slave arc suppression coil L2120 are connected in parallel between the neutral point of the power distribution network and the grounding point, the cascade H-bridge inverter 121 and the filter inductor 122 are connected in series, the cascade H-bridge inverter 121 is arranged on one side of the grounding point, and the filter inductor 122 is arranged on one side of the neutral point of the power distribution network. The device can output compensation current with good performance and reduce active powerThe compensation capacity realizes the purpose of performing full current compensation on the ground fault current.
Description
Technical Field
The application relates to the field of power distribution network ground fault protection research, in particular to a nonlinear damping resistor device.
Background
At present, related research for compensating out ground fault current, which is current generated when a ground fault (such as an electric shock accident) occurs in a power distribution network, is lacked in the research on ground fault protection of the power distribution network. The compensation of the grounding fault current can eliminate the electric arc and reduce the occurrence of electric shock accidents.
In order to solve the problem of electric shock protection, some power supply enterprises change a power distribution network neutral point grounding mode into a small-resistance grounding mode, but in the prior art, the capacity of the small-resistance grounding power distribution network for grounding protection reaction grounding resistance is only about 300 ohms, the neutral point grounding mode is changed into the small-resistance mode, and compensation for grounding fault current cannot be realized, but other problems can occur.
Disclosure of Invention
In order to solve the above technical problem, the present application provides a nonlinear damping resistor device, which can output a compensation current with good performance, and can reduce the capacity of active compensation, thereby achieving the purpose of performing full current compensation on ground fault current.
The embodiment of the application provides a nonlinear damping resistance device, which is used for: when a single-phase short-circuit fault occurs in a power distribution network, full current compensation is carried out on grounding fault current, and the nonlinear damping resistance device comprises: main arc suppression coil L 1110 and active slave arc suppression coil L 2120, wherein the active slave arc suppression coil L 2120 comprises: cascaded H-bridge inverter 121 and filter inductor L 2122 and a dc power supply group 123; wherein, the DC power supply group 123 is connected with the cascade H-bridge inverter 121 to supply power to the cascade H-bridge inverter, and the main arc suppression coil L 1110 and active slave arc suppression coil L 2120 are connected in parallel between a neutral point and a grounding point of the power distribution network, and cascade an H-bridge inverter 121 and a filter inductor L 2122 are connected in series, the cascade H-bridge inverter 121 is arranged on one side of the grounding point, and the filter inductor L 2122 are arranged on the neutral point side of the distribution network. Wherein, when the single-phase short circuit fault of distribution network takes place, main arc suppression coil L 1110 is used for compensating power frequency capacitive component in ground fault current, and active slave arc suppression coil L 2120 is used for the main arc suppression coil L 1110 pairs of the ground fault currentAnd compensating the compensated residual current.
In one composition structure of the nonlinear damping resistor device in the present application, the cascaded H-bridge inverter 121 includes at least two basic full-bridge units 1210 having the same structure and function, which are connected in series, each basic full-bridge unit 1210 includes two bridge arms connected in parallel, and each bridge arm includes a power tube and a diode.
In one embodiment of the present invention, the dc power supply set 123 includes: the number of the direct current power sources 1230 in the direct current power source group 123 is the same as that of the basic full-bridge unit 1210, and the direct current power sources 1230 are connected with the basic full-bridge unit 1210 in a one-to-one correspondence manner.
In one structure of the nonlinear damping resistor apparatus, the power transistor includes: an NPN type triode; the basic full-bridge cell 1210 includes: a first NPN type triode V 11211. Second NPN type triode V21212. Third NPN type triode V31213. Fourth NPN type triode V 41214. A first diode 1215, a second diode 1216, a third diode 1217, and a fourth diode 1218; wherein, the first NPN type triode V 11211 emitter and second NPN transistor V 21212, a third NPN transistor V 31213 and a fourth NPN transistor V 41214, a first NPN type triode V 11211 and a third NPN transistor V 31213 is connected to a first node connected to the positive electrode of the DC power source 1230, and a second NPN transistor V 21212 and a fourth NPN transistor V 41214 is connected to a second node, which is connected to the negative pole of the dc power source 1230; a first diode 1215 reversely connected to the first NPN type triode V 11211 between the collector and emitter; a second diode 1216 is reversely connected to the second NPN transistor V 21212 between collector and emitter; a third diode 1217 is connected in reverse to the third NPN transistor V 31213 between collector and emitter; a fourth diode 1218 connected in reverse to the fourth diodeNPN type triode V 41214 between the collector and emitter.
In one structure of the nonlinear damping resistor device in the present application, the nonlinear damping resistor device further includes: a controller connected to the cascade H-bridge inverter 121; the controller is used for: when a single-phase short-circuit fault occurs in the power distribution network, the cascade H-bridge inverter 121 is controlled to input compensation current to a neutral point of the power distribution network.
In the topology of the nonlinear damping resistance device, when a single-phase short-circuit fault occurs in the power distribution network, the main arc suppression coil L 1110 is used for compensating power frequency capacitive component in ground fault current, and active slave arc suppression coil L 2120 is used for the main arc suppression coil L1And 110, compensating the residual current after the ground fault current compensation, not only outputting the compensation current with good performance, but also reducing the capacity of active compensation, realizing the purpose of performing full current compensation on the ground fault current, and improving the measurement precision of the equivalent ground parameters of the power distribution network.
Drawings
Fig. 1 is a schematic structural diagram of a nonlinear damping resistor device provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of one of the cascaded H-bridge inverters provided in the embodiments of the present application;
fig. 3 is a signal waveform diagram of a driving signal corresponding to a cascaded H-bridge inverter provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a three-phase power distribution network corresponding to the nonlinear damping resistor device provided in the embodiment of the present application.
In the above fig. 1-4, the respective reference numerals and their meanings are as follows:
110. main arc suppression coil L1(ii) a 120. Active slave arc suppression coil L2(ii) a 121. A cascaded H-bridge inverter; 122. filter inductance L2(ii) a 123. A DC power supply set; 1210. a basic full-bridge cell; 1230. a direct current power supply; 1211. first NPN type triode V 11212, a second NPN type triode V 21213 and a third NPN transistor V 31214, fourth NPN type IIIPolar tube V41215, a first diode; 1216. a second diode; 1217. a third diode; 1218 a fourth diode.
Detailed Description
Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
In the description of the present application, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "inner," "outer," "top," "bottom," and the like, as used herein, refer to an orientation or positional relationship shown in the drawings for convenience in describing the present application and to simplify description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; the two components may be mechanically connected, directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
First, the arc suppression coil is used to suppress the arc, and is an inductance coil with an iron core, which is connected between the neutral point of the transformer (or generator) and the ground to form an arc suppression coil grounding system. The power transmission line of the power system is grounded through the arc suppression coil, and the power transmission line is one of small-current grounding systems. When the arc suppression coil operates normally, no current passes through the arc suppression coil. When the power grid is struck by lightning or single-phase arc grounding occurs, the potential of a neutral point rises to a phase voltage, at the moment, the inductive current flowing through the arc suppression coil and the capacitive fault current of the single-phase grounding are mutually offset, so that the fault current is compensated, the residual current after compensation is very small and is not enough to maintain the electric arc, and the electric arc is automatically extinguished. Thus, the earth fault can be eliminated quickly without causing overvoltage.
The method is characterized in that the power grid is struck by lightning or is subjected to single-phase arc grounding and the like, and belongs to single-phase short-circuit faults, after the single-phase grounding fault occurs in the power distribution network, three parameters of resistance, inductance and capacitance exist in a loop, firstly, the inductance can only compensate reactive parameters, and active residual current exists in grounding fault current; secondly, the inductance of the arc suppression coil is designed according to the requirement of power frequency compensation, only power frequency reactive current can be compensated, a large amount of harmonic voltage exists in an actually operated system, and the arc suppression coil cannot compensate the capacitive current to the ground caused by the harmonic; finally, the power distribution system usually adopts overcompensation (that is, the inductive current which can be compensated by the arc suppression coil is larger than the system ground fault current), and partial inductive current still exists after the arc suppression coil is compensated.
In order to facilitate understanding of the nonlinear damping resistor device in the embodiment of the present application, the following detailed description is made of a heightening device in the embodiment of the present application in conjunction with a specific embodiment.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a nonlinear damping resistor device provided in an embodiment of the present application.
As shown in fig. 1, the non-damped resistor apparatus in the embodiment of the present application includes: main arc suppression coil L 1110 and active slave arc suppression coil L 2120, wherein the active slave arc suppression coil L 2120 comprises: cascaded H-bridge inverter 121 and filter inductor L 2122 and a dc power supply group 123; the DC power supply group 123 is connected with a cascade H-bridge inverter 121, and a main arc suppression coil L 1110 and an active arc suppression coil 120 are connected in parallel between a neutral point and a grounding point of the power distribution network, and an H bridge inverter 121 and a filter inductor L are cascaded2122 are connected in series, the cascade H-bridge inverter is arranged on one side of a grounding point, and a filter inductor L 2122 are arranged on the neutral point side of the distribution network.
In the topology of the nonlinear damping resistor device, when the single-phase short-circuit fault occurs in the power distribution network, the main arc suppression coil L 1110 power frequency capacitor for grounding fault currentCompensation of the linear component, active slave arc suppression coil L 2120 is used for the main arc suppression coil L 1110 compensate for the residual current after the ground fault current compensation.
In the above-mentioned main arc-suppression coil L 1110 and the cascade H-bridge inverter 121, a main arc suppression coil L1The 110 inductance is designed according to the power frequency compensation requirement of the power distribution network, and when the single-phase short-circuit fault occurs in the power distribution network system after the single-phase grounding of the power distribution network occurs, the main arc suppression coil L is adjusted1110 compensating main power frequency capacitive component in the earth fault current; active slave arc suppression coil L 2120, current compensation is carried out mainly based on the cascade H-bridge inverter 121, on one hand, when the power distribution network runs normally, the cascade H-bridge inverter 121 is controlled to calculate the ground parameters of the power distribution network system and estimate the arc extinction instruction current after the fault based on the ground parameters; and after the single-phase earth fault occurs, injecting controllable current into a neutral point of the power distribution network according to the obtained arc extinction instruction current in a compensation algorithm and an inverter control algorithm, and compensating reactive, active and harmonic currents in residual current flow to realize the purpose of full current compensation. Wherein the residual current refers to a main arc suppression coil L in the earth fault current 1110 cannot compensate for part of the current.
Main arc suppression coil L in this application1And an active slave arc suppression coil L2The nonlinear damping resistance device obtained by combination can output compensation current with good performance, can reduce the capacity of active compensation, achieves the purpose of carrying out full current compensation on ground fault current, and can improve the measurement precision of equivalent ground parameters of the power distribution network.
Optionally, in the nonlinear damping resistor device of the present application, the cascaded H-bridge inverter 121 includes at least two basic full-bridge units 1210 with identical structures and functions connected in series, each basic full-bridge unit 1210 includes two bridge arms connected in parallel, and each bridge arm includes a power tube and a diode. Further, the dc power supply group 123 includes: at least two DC power sources 1230 with the same output voltage, the number of the DC power sources 1230 in the DC power source group 123 is the same as that of the basic full-bridge unit 1210, and the DC power sources 1230 are connected with the basic full-bridge unit 1210 in a one-to-one correspondence manner.
Each basic full-bridge unit 1210 can output signals of three levels, the superposition of the levels can be realized after a plurality of basic full-bridge units are connected in series, and the harmonic content of the output voltage is obviously reduced along with the increase of the number of the cascaded units. Under the control of CPS-SPWM modulation strategy and certain modulation ratio, the output amplitude can be 0-NxUDCRange, alternating voltage with level number (2 x N +1), where N is the number of cascades of basic full-bridge cells, UDCA dc voltage value output for each dc power source 1230.
In this embodiment, the bridge arm of the basic full-bridge unit 1210 is formed by connecting NPN-type triodes in series, where an NPN-type triode is a triode formed by sandwiching a P-type semiconductor (i.e., two PN junctions) between two N-type semiconductors, a junction between the base region and the emitter region is an emitter junction, a junction between the base region and the collector region is a collector junction, and corresponding pins are respectively led out from the base region, the emitter region, and the collector region, and are respectively named as a base, an emitter, and an collector.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a cascaded H-bridge inverter provided in an embodiment of the present application.
As shown in fig. 2, the cascaded H-bridge inverter 121 is formed by two basic full-bridge units 1210 connected in series, and the two basic full-bridge units 1210 have the same structure and function, one of which is connected with the filter inductor L2The other is connected to the ground point. And a filter inductor L2The connected basic full-bridge cell 1210 comprises: a first NPN type triode V 11211. Second NPN type triode V 21212. Third NPN type triode V 31213. Fourth NPN type triode V 41214. A first diode 1215, a second diode 1216, a third diode 1217, and a fourth diode 1218. Likewise, the basic full-bridge cell 1210 connected to ground comprises: four NPN type triodes (V)5、V6、V7、V8) And four diodes, wherein the diodes are connected between the collector and the emitter of the corresponding NPN type triode in the one-to-one corresponding direction.
Due to the fact thatThe basic full-bridge cell is identical in structure and function, and a filter inductor L is connected in the following2The basic full-bridge cell 1210 includes: a first NPN type triode V 11211 emitter and second NPN transistor V 21212 are connected to each other and to the filter inductance L2Connected to a third NPN transistor V 31213 and a fourth NPN transistor V 41214, a first NPN type triode V 11211 and a third NPN transistor V 31213 is connected to a first node connected to the positive electrode of the DC power source 1230, and a second NPN transistor V 21212 and a fourth NPN transistor V 41214 is connected to a second node, which is connected to the negative pole of the dc power source 1230; a first diode 1215 is reversely connected to the first NPN type triode V 11211 between the collector and emitter; a second diode 1216 is reversely connected to the second NPN transistor V 21212 between collector and emitter; a third diode 1217 is connected in reverse to the third NPN transistor V 31213 between collector and emitter; a fourth diode 1218 connected in reverse to the fourth NPN transistor V 41214 between the collector and emitter.
In fig. 2, two basic full-bridge units 1210 are respectively formed by two bridge arms formed by connecting NPN-type triodes in series, and a filter inductor L is connected thereto2The basic full-bridge unit 1210 comprises a bridge arm 1 and a bridge arm 3, the basic full-bridge unit 1210 connected with a grounding point comprises a bridge arm 2 and a bridge arm 4, the bridge arm 1 and a filter inductor L2And the bridge arm 3 is connected with the bridge arm 2 in series, and the bridge arm 4 is connected with a grounding point.
When single-phase short-circuit fault occurs, the filter inductor L2The voltages at two ends are respectively output voltages U of the cascaded H-bridge inverterinAnd neutral point voltage Uf0Filter inductance L2Voltage U onL2Compensation current I injected into neutral point of power distribution network along with output of cascaded H-bridge inverterinChange when the voltage U isL2And Uf0When the phases of (1) are the same, UinObtaining a maximum value; when voltage UL2And Uf0When the phases of (1) are opposite, UinObtaining the minimum value, so as to compensate the current I only if the number of basic full-bridge units in the cascade H-bridge inverter is properinGood following performance can be obtained.
Further optionally, in a structure of the embodiment of the present application, the nonlinear damping resistor device further includes: a controller connected to the cascade H-bridge inverter 121; the controller is used for: when a single-phase short-circuit fault occurs in the power distribution network, the cascade H-bridge inverter 121 is controlled to input compensation current to a neutral point of the power distribution network.
The controller controls the cascaded H-bridge inverter 121 as follows:
according to the CPS-SPWM principle, four bridge arms generate 8 power tube driving signals under the comparison of four paths of triangular carrier signals and one modulation signal. The carrier signals of the four bridge arms are triangular waves with equal amplitude and 90-degree phase difference, and are Tr1, Tr2, Tr3 and Tr4 in sequence; the modulation signal is a sine wave with a modulation ratio of 0.8, and the carrier ratio is 2; the signal waveforms are shown in FIG. 3 below;
in fig. 3, SG _11 and SG _12 respectively represent driving signals of a first NPN transistor V11211 and a second NPN transistor V21212 of the bridge arm 1; on-line NPN type triode V3-V8The driving signals of the NPN type triode are SG _21, SG _22, SG _31, SG _32, SG _41 and SG _42 respectively, and the NPN type triode is driven by high level.
The carrier wave Tr1 with the initial phase of 0 degree is compared with the modulated wave Ur, and the switches of the two NPN triodes on the bridge arm 1 are controlled. When Ur > Tr1, SG _11 is high level, drive V1 is turned on; the complementary signal SG _12 low level, V2 off;
the carrier Tr2 with an initial phase of 90 ° is compared with the modulated wave Ur to control the switching of the two NPN transistors in the arm 2. When Ur > Tr2, SG _21 is high level, and drive V5 is conducted; the complementary signal SG _22 is low and V6 is off.
The carrier Tr3 having an initial phase of 180 ° is compared with the modulated wave Ur to control the switching of the two NPN transistors in the arm 3. When Ur < Tr3, SG _31 is high, drive V3 is on; the complementary signal SG _32 is low and V4 is off.
The carrier Tr3 having an initial phase of 270 ° is compared with the modulated wave Ur, and the switching of the two NPN transistors in the arm 4 is controlled. When Ur < Tr4, SG _41 is high, drive V7 is on; the complementary signal SG _42 is low and V8 is off.
In conclusion, as can be seen from the analysis of the operating principle of the 2-unit 5-level cascaded inverter, for each basic full-bridge unit, the carrier signals of the two bridge arms are complementary and are compared with the modulation wave Ur (a sine wave in fig. 2) to generate a driving signal; for N basic full-bridge units, the (2X N) bridge arms generate driving signals to control the switches of the NPN triodes at the upper parts of the bridge arms by comparing (2X N) phase angle difference (180X N) degrees of carrier waves with modulation waves, and the NPN triodes at the lower parts are driven by complementary signals of the NPN triodes at the upper parts. The driving of the three-phase cascade H bridge is similar to that of a single phase, and only three sine waves with the phase difference of 120 are required to be compared with the carrier waves of each bridge arm to generate driving signals of three phases A, B and C.
The method for generating the driving signal by applying the CPS-SPWM modulation mode is simple, easy to actually operate and has outstanding advantages. The carrier phase shift modulation CPS mode can make the sine wave pulse width modulation SPWM signals of all basic full-bridge units in the cascaded H-bridge inverter staggered mutually, further make the total output voltage of the cascaded H-bridge inverter mutually superpose and offset the inversion voltage of each basic full-bridge unit, make the total output square wave voltage frequency (2 × N) times of the actual switching frequency, so the total output voltage quality of the cascaded H-bridge inverter is improved, the harmonic content is small; the (2 × N +1) level sine wave output greatly improves the quality of sine wave voltage, and the voltage stress of each NPN type triode is reduced; the input is mutually isolated low-voltage direct-current power supplies, all the power supplies are not influenced mutually, and voltage sharing is easy; the transformer has the characteristics of a power electronic transformer, inputs low-voltage direct current and outputs high-voltage alternating current, can replace the transformer to be connected with a high-voltage alternating current device, and is wide in application; the modulation methods of all units are the same, only phase shift operation is needed to be carried out on the triangular carrier, and a control algorithm is easy to realize in controllers such as a DSP and the like, so that the method is easy to be practically applied.
It should be noted that, the function of the cascaded H-bridge inverter in the nonlinear damping resistance device in the present application may be implemented by an NPN-type triode, and may also be implemented by other power transistors, which is not limited in this application. In addition, the number of basic full-bridge units in the cascaded H-bridge inverter can be selected according to different power distribution network systems so as to obtain the optimal current compensation effect.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a three-phase power distribution network corresponding to the nonlinear damping resistor device provided in the embodiment of the present application.
As shown in fig. 4, the three-phase distribution network includes: by main arc suppression coil L 1110 and active slave arc suppression coil L 2120, a star-connected A, B, C three-phase circuit and a load thereof. Wherein R in FIG. 4a、RbAnd RcEquivalent resistances to ground of A phase, B phase and C phase, Ca、CbAnd CcThe equivalent capacitance to the ground of the A phase, the B phase and the C phase respectively. RdFault resistance for single-phase earth faults, R under normal conditionsdThe value of (d) is 0.
Under the normal state: timing the neutral point voltage U by the controller0Main arc suppression coil L 1110 gear and reactance value are detected, and the earth capacitance value C of each phase circuit of the current system is calculated by utilizing an earth capacitance current detection algorithma、CbAnd Cc(ii) a Checking the main arc suppression coil L using the real-time calculation results1Whether the 110 gears are proper or not, if not, the main arc suppression coil L is arranged1110 to a gear around 15% overcompensation; analyzing historical fault recording data, calculating zero sequence fundamental wave reactive current values of all lines under various conditions of single-phase earth faults, calculating the earth capacitance and the occupied proportion of all lines, and calculating current distortion components under different single-phase earth faults.
In a single-phase earth fault state: detecting zero sequence current of the line, and starting a fault line selection program to select a fault line; the zero sequence current at the outlet of the fault line, the system earth capacitance calculated in the normal state, the fault line capacitance and the current distortion empirical value under the fault condition are utilized to carry out fault total current estimation to obtain the fault-containing condition of the whole systemFault line grounding current, fault current I containing power component and harmonic componentf0(ii) a Detecting the current main arc suppression coil L 1110 and active slave arc suppression coil L 2120, and applying an active inversion algorithm to generate a power device driving signal to control an active slave arc suppression coil L2And carrying out full compensation.
Active slave arc suppression coil L in nonlinear damping resistance device in application 2120 can optimize main arc suppression coil L 1110 under the fault condition of power loss and harmonic component, the residual current after compensation is reduced to a level which is very small and close to O, thus ensuring the success rate of reliable arc quenching of the electric arc grounding fault.
While some of the embodiments of the present application have been described above with reference to the accompanying drawings, those skilled in the art will be able to implement the apparatus of the present application in a variety of modifications without departing from the scope and spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not intended to limit the scope of the present application, which is defined by the appended claims and their equivalents. The embodiments of the present application have been described in detail above, but the present application is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the application, and the scope of the application is to be accorded the full scope of the claims.
Claims (2)
1. A nonlinear damping resistance device, comprising:
main arc suppression coil L1(110) And an active slave arc suppression coil L2(120) Wherein the active slave arc suppression coil L2(120) The method comprises the following steps: cascaded H-bridge inverter (121) and filter inductor L2(122) And a direct current power supply group (123);
the DC power supply group (123) is connected with the cascade H-bridge inverter (121), and the main arc suppression coil L1(110) And the active slave arc suppression coil L2(120) Connected in parallel between a neutral point and a grounding point of the power distribution network, the cascade H-bridge inverter (121) and the filter inductor L2(122) The cascaded H-bridge inverter (121) is arranged on one side of the grounding point, and the filter inductor L is connected in series2(122) The power distribution network neutral point is arranged on one side of the power distribution network;
the cascade H-bridge inverter (121) is formed by connecting at least two basic full-bridge units (1210) with completely identical structures and functions in series, each basic full-bridge unit (1210) is formed by connecting two bridge arms in parallel, and each bridge arm is formed by a power tube and a diode;
the DC power supply group (123) comprises: at least two DC power supplies (1230) with the same output voltage, wherein the number of the DC power supplies (1230) in the DC power supply group (123) is the same as that of the basic full-bridge unit (1210), and the DC power supplies (1230) and the basic full-bridge unit (1210) are connected in a one-to-one correspondence manner;
the power tube is as follows: an NPN type triode; the basic full-bridge cell (1210) comprises: a first NPN type triode V1(1211) A second NPN type triode V2(1212) And a third NPN type triode V3(1213) And a fourth NPN type triode V4(1214) A first diode (1215), a second diode (1216), a third diode (1217), and a fourth diode (1218);
wherein the first NPN type triode V1(1211) An emitter and the second NPN type triode V2(1212) Is connected with the collector of the third NPN-type triode V3(1213) And the fourth NPN type triode V4(1214) Is connected with the collector of the first NPN type triode V1(1211) And the third NPN type triode V3(1213) Is connected to a first node connected to the positive pole of the dc power supply (1230), and the second NPN transistor V2(1212) And the fourth NPN type triode V4(1214) Is connected to a second node, which is connected to the negative pole of the dc power source (1230);
the first diode (1215) is reversely connected toThe first NPN type triode V1(1211) Between the collector and emitter; the second diode (1216) is connected in reverse to the second NPN transistor V2(1212) Between the collector and emitter; the third diode (1217) is connected in reverse to the third NPN transistor V3(1213) Between the collector and emitter; the fourth diode (1218) is reversely connected to the fourth NPN type triode V4(1214) Between the collector and the emitter.
2. The nonlinear damping resistance device of claim 1, further comprising: a controller connected with the cascaded H-bridge inverter (121).
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| CN202122724754.XU CN216489758U (en) | 2021-11-09 | 2021-11-09 | Nonlinear damping resistance device |
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| CN202122724754.XU CN216489758U (en) | 2021-11-09 | 2021-11-09 | Nonlinear damping resistance device |
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