CN109813997B - Controllable current source grounding current full-compensation output current calculation method and system - Google Patents
Controllable current source grounding current full-compensation output current calculation method and system Download PDFInfo
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Abstract
The application discloses a controllable current source earth fault current full compensation method and system, which comprises the steps of detecting the three-phase voltage and the neutral point voltage of a system when the system normally operates; the controllable current source outputs a detection current; acquiring system neutral point voltage corresponding to the detection current output by the controllable current source; and calculating the current value which should be output by the controllable current source when the ground current is completely compensated after the single-phase ground fault occurs. According to the method, after the three-phase voltage and the neutral point current of the system are detected in a mode of accessing the current source, the detection current is output by the controllable current source, the system neutral point voltage corresponding to the detection current output by the controllable current source is obtained, and the corresponding output current when the controllable current source is subjected to single-phase grounding current full compensation is obtained through recalculation. Therefore, the output current value of the access system is ensured to be more accurate, the purposes of effectively compensating fault phases and extinguishing arc are achieved, the safe and stable operation of a power grid is further ensured, and fire disasters and personal electric shock accidents caused by fault points are avoided.
Description
Technical Field
The application relates to the technical field of single-phase grounding full compensation of a power grid system, in particular to a method and a system for calculating grounding full compensation output current of a controllable current source.
Background
In a power grid system, particularly in a medium-low voltage power distribution network system, single-phase earth faults account for the vast majority of the total number of faults. When the system capacitance current exceeds a certain value, the grounding electric arc can not be extinguished automatically when a single-phase grounding fault occurs, and arc overvoltage and other secondary hazards are generated. Low-voltage power distribution networks in China generally adopt a low-current grounding mode, including a neutral point ungrounded mode or a neutral point arc suppression coil grounding mode. When the neutral point is not grounded, the grounding electric arc cannot be extinguished by self, and the personnel safety and the operation safety cannot be guaranteed. Under the mode that the neutral point is grounded through the arc suppression coil, part of the grounding arc can be automatically extinguished under the reactive current effect compensated by the arc suppression coil, but the arc suppression coil can only compensate the reactive current, and grounding residue still exists after compensation. The residue includes a certain overcompensation inductive current and active current, and the risk of electric shock of personnel, fire hazard and the like still exists. The purposes of completely extinguishing electric arc and avoiding electric shock danger can be achieved through the full compensation of the grounding current, so that the zero-current full compensation method is a reliable and safe single-phase grounding fault treatment means. In the prior art, a current source is connected to a neutral point for compensation, but the current value of a connected system cannot be ensured, so that the arc extinction is difficult, the safe and stable operation of a power grid cannot be ensured, and a fire disaster and a personal electric shock accident caused by a fault point still exist.
Disclosure of Invention
The application provides a method and a system for calculating the grounding full-compensation output current of a controllable current source, which aim to solve the problems that in the prior art, a current source is connected into a neutral point to compensate, but the current value of the connected system cannot be ensured, the arc extinction is difficult, the safe and stable operation of a power grid cannot be ensured, and a fire disaster and a personal electric shock accident are caused by a fault point.
A method for calculating the grounding full-compensation output current of a controllable current source comprises the following steps:
when the system normally operates, detecting the three-phase voltage of the system and detecting the neutral point voltage of the system;
the controllable current source outputs a detection current;
acquiring system neutral point voltage corresponding to the detection current output by the controllable current source;
and calculating the current value which should be output by the controllable current source when the ground current is completely compensated after the single-phase ground fault occurs.
Further, after the controllable current source outputs the detection current, the unbalanced voltage of the system does not exceed 15% of the nominal voltage of the system.
Furthermore, the current phase of the detection current output by the controllable current source is an arbitrary phase.
Furthermore, when the grounding current is continuously and completely compensated after the calculation of the single-phase fault, the current value which is required to be output by the controllable current source passes through a formula
Calculating to obtain;
I0when the grounding current is completely compensated, the current value which the controllable current source should output is represented;
UPrepresenting the phase voltage of the ground phase when the system is in normal operation;
ITa sense current representative of the controllable current source output;
ETthe voltage of a system neutral point is shown after the controllable current source outputs the detection current;
E0representing the neutral point voltage at which the system is operating normally.
Further, the system is a neutral ungrounded system.
Further, the system is a charged inductance compensation system.
Further, the charged inductance compensation system is in a compensation state when the system normally operates, and does not contain damping resistors.
A controllable current source grounding full-compensation output current calculation system comprises a controllable current source, a current sensor, a voltage sensor and a calculation unit;
the current sensor is electrically connected with the voltage sensor, the calculating unit and the three-phase power transmission line respectively;
the controllable current source is electrically connected with the three-phase power transmission line through a current sensor;
the voltage sensor is connected with the computing unit;
the three-phase power transmission lines are all grounded through capacitors.
Further, the system for calculating the ground full-compensation output current of the controllable current source further comprises a compensation inductor;
the compensation inductor is electrically connected with the three-phase power transmission line and grounded.
Further, the controllable current source is electrically connected with a current control unit.
The beneficial effect of this application is:
the application provides a controllable current source earth fault current full compensation method and system, which comprises the steps of detecting system three-phase voltage and detecting system neutral point voltage when a system normally operates; the controllable current source outputs a detection current; acquiring system neutral point voltage corresponding to the detection current output by the controllable current source; and calculating the current value which should be output by the controllable current source when the ground current is completely compensated after the single-phase ground fault occurs. According to the method, when a single-phase earth fault occurs, after the three-phase voltage and the neutral point current of the system are detected, the detection current is output by the controllable current source, the system neutral point voltage corresponding to the detection current output by the controllable current source is obtained, and the corresponding output current when the controllable current source is subjected to single-phase earth current full compensation is obtained through recalculation. The system comprises a controllable current source, a current sensor, a voltage sensor and a calculation unit; the current sensor is electrically connected with the voltage sensor, the calculating unit and the three-phase power transmission line respectively; the controllable current source is electrically connected with the three-phase power transmission line through a current sensor; the voltage sensor is connected with the computing unit; the three-phase power transmission lines are all grounded through capacitors. Therefore, the output current value of the access system is ensured to be more accurate, the purposes of effectively compensating fault phases and extinguishing arc are achieved, the safe and stable operation of a power grid is further ensured, and fire disasters and personal electric shock accidents caused by fault points are avoided.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic flow chart illustrating a method for fully compensating for ground fault current of a controllable current source according to the present invention;
FIG. 2 is a circuit diagram of a controllable current source ground fault current full compensation device for a neutral point ungrounded mode according to the present application;
fig. 3 is a circuit diagram of a controllable current source ground fault current full compensation device for a neutral point through arc suppression coil grounding mode according to the present application.
The method comprises the following steps of 1-controllable current source, 2-current sensor, 3-voltage sensor, 4-calculating unit and 5-compensation inductance.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application.
Fig. 1 is a schematic flow chart of a method for fully compensating for a ground fault current of a controllable current source according to the present application.
A method for calculating the grounding full-compensation output current of a controllable current source comprises the following steps:
when the system normally operates, detecting the three-phase voltage of the system and detecting the neutral point voltage of the system;
the controllable current source outputs a detection current;
acquiring system neutral point voltage corresponding to the detection current output by the controllable current source;
and calculating the current value which should be output by the controllable current source when the ground current is completely compensated after the single-phase ground fault occurs.
According to the embodiment of the application, the neutral point is connected into the controllable current source with the adjustable output current to carry out full compensation on the fault phase grounding current so as to achieve the arc quenching effect. Before calculating the complete compensation fault phase grounding current, whether a single-phase grounding fault occurs needs to be detected. In implementation, whether the grounding is performed or not can be judged according to the magnitude of the zero sequence current and the magnitude of the zero sequence voltage in the circuit. Since each phase voltage is different when a single-phase ground fault occurs, fault phase selection is performed when a single-phase ground fault is detected. There are many methods to judge the fault phase selection. However, the fault phase is judged by firstly measuring the three-phase voltage and according to the amplitude and the phase of the three-phase voltage. Specifically, when a certain phase is grounded, the voltage corresponding to the phase decreases. And detecting the three-phase voltage and the neutral point voltage of the system when the system is in normal operation. And when the corresponding single-phase earth fault phase is detected, outputting the detection current through the controllable current source, and acquiring the system neutral point voltage corresponding to the detection current output by the controllable current source. When the single-phase earth fault occurs and the earth current is completely compensated, the single-phase earth current is completely compensated according to the current value which is output by the controllable current source and the calculated current value which is output by the controllable current source.
According to the technical scheme, the method for fully compensating the ground fault current of the controllable current source comprises the steps of detecting the three-phase voltage of the system and the neutral point voltage of the system when the system normally operates; the controllable current source outputs a detection current; acquiring system neutral point voltage corresponding to the detection current output by the controllable current source; and calculating the current value which should be output by the controllable current source when the ground current is completely compensated after the single-phase ground fault occurs. According to the method, when a single-phase earth fault occurs, after the three-phase voltage and the neutral point current of the system are detected, the detection current is output by the controllable current source, the system neutral point voltage corresponding to the detection current output by the controllable current source is obtained, and the corresponding output current when the controllable current source is subjected to single-phase earth current full compensation is obtained through recalculation. Therefore, the output current value of the access system is ensured to be more accurate, the purposes of effectively compensating fault phases and extinguishing arc are achieved, the safe and stable operation of a power grid is further ensured, and fire disasters and personal electric shock accidents caused by fault points are avoided.
Further, after the controllable current source outputs the detection current, the unbalanced voltage of the system does not exceed 15% of the nominal voltage of the system.
When the fully compensated grounding current is obtained through calculation, the current value which is required to be output by the controllable current source is fully compensated, and the unbalanced voltage of the system is set to be not more than 15% of the nominal voltage of the system after the single-phase grounding fault is fully compensated. If the unbalanced voltage of the system exceeds 15% of the nominal voltage of the system, the detection current source output by the controllable current source is continuously selected, so that the neutral point voltage of the system is obtained after the detection current output by the controllable current source is obtained, the calculation is carried out through the formula, and when the grounding current is completely compensated, the current value which the controllable current source should output is obtained, the single-phase grounding fault current full compensation is carried out, so that the unbalanced voltage of the system does not exceed 15% of the nominal voltage of the system.
Furthermore, the current phase of the detection current output by the controllable current source is an arbitrary phase.
For convenient calculation, the controllable current source can be set according to the practical application scene to output the detection current, and the current phase is set to be any phase.
Furthermore, when the grounding current is continuously and completely compensated after the calculation of the single-phase fault, the current value which is required to be output by the controllable current source passes through a formula
Calculating to obtain;
I0when the grounding current is completely compensated, the current value which the controllable current source should output is represented;
UPrepresenting the phase voltage of the ground phase when the system is in normal operation;
ITa sense current representative of the controllable current source output;
ETthe voltage of a system neutral point is shown after the controllable current source outputs the detection current;
E0representing the neutral point voltage at which the system is operating normally.
Further, the system is a neutral ungrounded system.
Further, the system is a charged inductance compensation system.
Fig. 2 is a circuit diagram of a controllable current source ground fault current full compensation device for a neutral point ungrounded mode according to the present application; fig. 3 is a circuit diagram of a controllable current source ground fault current full compensation device for a neutral point through arc suppression coil grounding mode according to the present application.
The method for calculating the grounding full-compensation output current of the controllable current source is suitable for the current full-compensation of the single-phase grounding fault of the 6-35kV power system. The detection current output by the controllable current source can be determined according to the practical application scene. Preferably, the controllable voltage and current output current is controlled by connecting the controllable current source current control unit, so that the current can be output according to the requirements of practical application scenes.
The three-phase system with the neutral point grounded through the arc suppression coil can continue to supply power when a single-phase earth fault occurs, but cannot continue to supply power when the single-phase earth fault current is large, such as when the 35kV system is larger than 10A and when the 10kV system is larger than 30A. To overcome this drawback, a grounding via the arc suppression coil is provided. At present, in a 35kV power grid system, the mode that the neutral point is grounded through an arc suppression coil is generally adopted. Preferably, the charged inductance compensation system is in a compensation state when the system normally operates, and does not contain a damping resistor.
The method is applied to a compensation system with inductance, and a damping resistor is omitted, so that the current value which is required to be output by the controllable current source when the completely compensated grounding current is obtained through calculation is prevented from being influenced.
A controllable current source grounding full-compensation output current calculation system comprises a controllable current source 1, a current sensor 2, a voltage sensor 3 and a calculation unit 4;
the current sensor 2 is electrically connected with the voltage sensor 3, the calculating unit 4 and the three-phase power transmission line respectively;
the controllable current source 1 is electrically connected with the three-phase power transmission line through a current sensor 2;
the voltage sensor 3 is connected with the computing unit 4;
the three-phase power transmission lines are all grounded through capacitors.
Further, the system for calculating the ground full-compensation output current of the controllable current source further comprises a compensation inductor 5;
the compensation inductance 5 is electrically connected to the three-phase power line and grounded.
Further, the controllable current source 1 is electrically connected with a current control unit.
The controllable current source current control unit is connected to control the controllable voltage and current output current, so that the current can be output according to the requirements of practical application scenes.
According to the technical scheme, the method and the system for fully compensating the ground fault current of the controllable current source comprise the steps of detecting the three-phase voltage of the system and the neutral point voltage of the system when the system normally operates; the controllable current source outputs a detection current; acquiring system neutral point voltage corresponding to the detection current output by the controllable current source; and calculating the current value which should be output by the controllable current source when the ground current is completely compensated after the single-phase ground fault occurs. According to the method, when a single-phase earth fault occurs, after the three-phase voltage and the neutral point current of the system are detected, the detection current is output by the controllable current source, the system neutral point voltage corresponding to the detection current output by the controllable current source is obtained, and the corresponding output current when the controllable current source is subjected to single-phase earth current full compensation is obtained through recalculation. The system comprises a controllable current source 1, a current sensor 2, a voltage sensor 3 and a calculating unit 4; the current sensor 2 is electrically connected with the voltage sensor 3, the calculating unit 4 and the three-phase power transmission line respectively; the controllable current source 1 is electrically connected with the three-phase power transmission line through a current sensor 2; the voltage sensor 3 is connected with the computing unit 4; the three-phase power transmission lines are all grounded through capacitors. Therefore, the output current value of the access system is ensured to be more accurate, the purposes of effectively compensating fault phases and extinguishing arc are achieved, the safe and stable operation of a power grid is further ensured, and fire disasters and personal electric shock accidents caused by fault points are avoided.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (6)
1. A method for calculating the grounding full-compensation output current of a controllable current source is characterized by comprising the following steps:
when the system normally operates, detecting the three-phase voltage of the system and detecting the neutral point voltage of the system;
the controllable current source outputs a detection current;
acquiring system neutral point voltage corresponding to the detection current output by the controllable current source;
calculating the current value which should be output by the controllable current source when the ground current is completely compensated after the single-phase ground fault occurs;
the method for calculating the grounding full-compensation output current of the controllable current source is characterized in that after the calculation is carried out and the grounding current is continuously and completely compensated after the single-phase fault occurs, the current value to be output by the controllable current source passes through a formula
Calculating to obtain;
I0when the grounding current is completely compensated, the current value which the controllable current source should output is represented;
UPrepresenting the phase voltage of the ground phase when the system is in normal operation;
ITa sense current representative of the controllable current source output;
ETthe voltage of a system neutral point is shown after the controllable current source outputs the detection current;
E0representing the neutral point voltage at which the system is operating normally.
2. The method as claimed in claim 1, wherein the unbalanced voltage of the system after the controllable current source outputs the detected current does not exceed 15% of the nominal voltage of the system.
3. The method for calculating the ground fully compensated output current of the controllable current source according to claim 1, wherein the phase of the detected current outputted by the controllable current source is an arbitrary phase.
4. The method of claim 1, wherein the system is a neutral ungrounded system.
5. The method of claim 1, wherein the system is a system with inductance compensation.
6. The method according to claim 5, wherein the system with inductance compensation is in a compensation state when the system is in normal operation and does not include a damping resistor.
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