CN111293700B - Compensation adjustment method of self-generating power supply ground fault compensation system - Google Patents
Compensation adjustment method of self-generating power supply ground fault compensation system Download PDFInfo
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- CN111293700B CN111293700B CN202010081983.1A CN202010081983A CN111293700B CN 111293700 B CN111293700 B CN 111293700B CN 202010081983 A CN202010081983 A CN 202010081983A CN 111293700 B CN111293700 B CN 111293700B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
According to the compensation adjustment method of the self-generating power supply ground fault compensation system, provided by the embodiment of the application, the rated transformation ratio of the phase power supply generator and the rated transformation ratio of the phase power supply phase compensator are obtained; obtaining the equivalent leakage reactance of a phase power supply generator, the equivalent leakage reactance of a phase power supply phase compensator and the equivalent leakage reactance of a voltage regulator; acquiring capacitive reactance of a three-phase relatively distributed capacitor of the system; acquiring compensation inductance and inductance of the system, and distributing capacitance and inductance parallel impedance of the system three-phase relatively; calculating the reference transformation ratio of the voltage regulator through a reference transformation ratio formula of the voltage regulator; according to the fine adjustment method of the voltage regulator, the optimal voltage regulator transformation ratio is determined, and the calculation and adjustment of the voltage regulator adjustment target are achieved through the transformation ratio calculation method and the adjustment method of the voltage regulator, so that powerful compensation adjustment and support are provided for the ground fault current compensation system of the self-generated power supply.
Description
Technical Field
The application relates to the technical field of single-phase grounding compensation of a neutral point ungrounded system in a power system, in particular to a compensation adjustment method of a self-generating power supply grounding fault compensation system.
Background
The single-phase ground fault of the power distribution network at home and abroad accounts for more than 80%, the safe operation of the power grid and equipment is seriously influenced, and the safe treatment of the ground fault plays an important role in social and economic development. When the capacitance current of the system is more than 10A, an arc suppression coil grounding mode is adopted. The arc suppression coil can reduce fault current to a certain extent, the system can operate for 2 hours with faults, but the arc suppression coil can not realize full compensation, residual current smaller than 10A still exists at a fault point, and the existence of the residual current can cause personal electric shock and fire accidents and seriously threaten the safe and stable operation of a power grid and equipment. When the capacitance current of the system is large, a small-resistance grounding mode is adopted, when a single-phase grounding fault occurs, the zero-sequence current of the fault line is amplified, and the relay protection device rapidly cuts off the fault line, but the power supply reliability of the grounding mode is difficult to ensure, and when high-resistance grounding occurs, the risk of relay protection refusing action exists.
Currently, in order to thoroughly eliminate the harm of single-phase ground faults, the power supply reliability is ensured. Various methods for completely compensating the single-phase grounding fault point current are proposed at home and abroad. Swedish Neutral publication of application of the full compensation technique of the ground fault neutralizer discloses a method for compensating the ground fault point current by injecting a current into the Neutral point of the system through an active compensator. However, the residual current of the ground fault in the method cannot be directly obtained, the residual current value is calculated by adopting the system to the ground distribution parameter, and the deviation is larger; meanwhile, the compensator adopts a power electronic device to realize the control of the current phase and the amplitude, the current phase and the amplitude precision cannot be ensured at the same time, the compensation current has large harmonic content, the control is complex, and the stability is poor; therefore, the compensation effect of the GFN (ground fault neutralizer) manufactured by Swedish Neutral deviates greatly from an ideal value, and the result of the simulation test performed by the device in the Zhejiang area shows that the ground residual current after being compensated by the GFN device is still more than 5A for metallic ground faults, has a larger difference from the ideal value, namely zero current, and is only equivalent to the compensation effect of an arc suppression coil. Domestic, patent CN102074950a discloses a method for extinguishing and protecting the arc of a power distribution network ground fault, which is similar to the arc extinguishing method of Swedish Neutral. The method has the problems that when the metal grounding is carried out, the fault phase voltage is 0, and the fault voltage is controlled to be 0, the method only has an effect on high-resistance grounding faults, and the amplitude and the phase of the injected current need to be accurately controlled to control the fault phase voltage, so that the implementation difficulty is high.
The patent with application number 201710550400.3 discloses an active voltage reduction safety treatment method for the grounding fault of an ineffective grounding system, which is characterized in that tapping joints are arranged on side windings of a transformer system, and the voltage of a fault phase is reduced by short-circuiting the tapping joints of the winding of the fault phase to the ground or short-circuiting the tapping joints of the winding of the fault phase through impedance so as to achieve the purpose of limiting the current of the grounding fault point. Basically, when a single-phase grounding occurs in a power grid line, another grounding point is manufactured on the bus side of the system, the original single-phase grounding current is split, and obviously, the compensation effect of the method on a metallic single-phase grounding fault is poor, even invalid, and the device malfunction can cause interphase short circuit. The patent application numbers 201710544978.8 and 201710544976.9 disclose a phase step-down arc extinction method for a grounding fault of a non-effective grounding system, wherein when a single-phase grounding fault occurs, a power supply is externally applied between a bus on the side of the non-effective grounding system and the ground, or between a line and the ground, or between a neutral point and the ground, or between a tap of a winding on the side of the neutral point non-effective grounding system and the ground, so as to reduce the fault voltage. The two methods are different only in that one of the external power supplies is a voltage source, and the other is a current source, and no essential difference exists. There are also problems of control system phase voltage accuracy of the voltage source and the current source, and of uncontrollable phase voltage to ground being zero when metallic short circuit occurs. In both methods, when an external power source is directly applied between the bus or line and ground, the system line voltage is changed, which causes the system load (e.g., a distribution transformer) to fail to operate properly.
In the prior art, a method for completely compensating the single-phase ground fault current, which is simple and convenient to control, accurate and efficient, is not available, and the technology for achieving the reliability and the safety of power supply of a power distribution system is considered. Therefore, the applicant proposes a system and a method for compensating the ground fault current of a self-generated phase power supply (application numbers CN201910992109.0 and CN 201910992175.8), i.e. a system for realizing full compensation of single-phase ground fault current by using a phase power supply converter and a voltage regulator.
Disclosure of Invention
The application provides a compensation adjustment method of a ground fault compensation system of a self-generating power supply, which solves the problems of calculation and adjustment methods of an adjustment target of a voltage regulator by adopting the voltage regulator as a voltage regulator, provides powerful supplement and support for implementation of the ground fault current compensation system of the self-generating power supply, and solves the problems of the lack of the calculation and adjustment methods of the adjustment target of the voltage regulator of the ground fault current compensation system of the self-generating power supply.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical scheme:
the utility model provides a self-generating power supply ground fault compensating system compensation adjustment method, which comprises the following steps:
obtaining a rated transformation ratio of a phase power supply generator and a rated transformation ratio of a phase power supply phase compensator;
obtaining the equivalent leakage reactance of a phase power supply generator, the equivalent leakage reactance of a phase power supply phase compensator and the equivalent leakage reactance of a voltage regulator;
acquiring capacitive reactance of a three-phase relatively distributed capacitor of the system;
acquiring compensation inductance and inductance of the system, and distributing capacitance and inductance parallel impedance of the system three-phase relatively;
calculating the reference transformation ratio of the voltage regulator through a reference transformation ratio formula of the voltage regulator;
and determining the optimal voltage regulator transformation ratio according to the fine adjustment method of the voltage regulator.
Optionally, the reference transformation ratio formula of the voltage regulator is:
wherein k is the reference transformation ratio of the voltage regulator, m and n are the rated transformation ratios of the phase power supply generator and the phase power supply phase compensator respectively, X T11 、X T21 、X T31 Equivalent leakage reactance of a phase power supply generator, a phase power supply phase compensator and a voltage regulator respectively, Z L For distributing capacitive reactance of system three relatively, Z when system contains compensating inductance L Distributing capacitive reactance and compensating inductive reactance for system to groundIs a parallel impedance of (c).
Optionally, when the system contains the compensating inductance, an arc suppression coil grounding mode is adopted.
Optionally, the fine adjustment method of the voltage regulator includes:
setting the voltage regulator as a reference transformation ratio, and closing a phase compensation switch;
acquiring zero sequence voltage of the system and phase power supply voltage of the system;
judging whether the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range or not;
when the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is in the voltage regulation threshold range, determining the reference transformation ratio of the voltage regulator as the optimal transformation ratio of the voltage regulator corresponding to the system;
when the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude does not fall within a voltage regulation threshold range, regulating the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude falls within the voltage regulation threshold range, and determining the voltage regulator reference transformation ratio at the moment as a voltage regulator optimal transformation ratio;
opening the one-phase compensation switch;
and repeating the steps to determine the optimal variable ratio value of the voltage regulator corresponding to the rest two-phase compensation switches.
Optionally, when the difference value between the zero sequence voltage amplitude and the phase supply voltage amplitude does not fall within a voltage adjustment threshold range, adjusting the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase supply voltage amplitude falls within the voltage adjustment threshold range, and determining the voltage regulator reference transformation ratio at the time as the voltage regulator optimal transformation ratio includes:
and when the zero sequence voltage amplitude is larger than the phase power supply voltage amplitude, increasing the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range, and determining the voltage regulator reference transformation ratio at the moment as a voltage regulator optimal transformation ratio.
And when the zero sequence voltage amplitude is smaller than the phase power supply voltage amplitude, reducing the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range, and determining the voltage regulator reference transformation ratio as a voltage regulator optimal transformation ratio.
Optionally, the fine adjustment method of the voltage regulator further comprises the step of adjusting the voltage threshold to be 0.1% -1% of the nominal voltage of the system.
Optionally, the equivalent leakage reactance is an integral part of the equivalent internal impedance.
Optionally, the equivalent internal impedance includes a direct current resistance, an excitation reactance, and an equivalent leakage reactance of the transformer.
According to the compensation adjustment method of the self-generating power supply ground fault compensation system, provided by the embodiment of the application, the rated transformation ratio of the phase power supply generator and the rated transformation ratio of the phase power supply phase compensator are obtained; obtaining the equivalent leakage reactance of a phase power supply generator, the equivalent leakage reactance of a phase power supply phase compensator and the equivalent leakage reactance of a voltage regulator; acquiring capacitive reactance of a three-phase relatively distributed capacitor of the system; acquiring compensation inductance and inductance of the system, and distributing capacitance and inductance parallel impedance of the system three-phase relatively; calculating the reference transformation ratio of the voltage regulator through a reference transformation ratio formula of the voltage regulator; according to the fine adjustment method of the voltage regulator, the optimal voltage regulator transformation ratio is determined, and the calculation and adjustment of the voltage regulator adjustment target are achieved through the transformation ratio calculation method and the adjustment method of the voltage regulator, so that powerful compensation adjustment and support are provided for the ground fault current compensation system of the self-generated power supply.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a compensation adjustment method of a self-generated power supply ground fault compensation system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a self-generating power supply ground fault current compensator according to an embodiment of the present application;
FIG. 3 is a diagram of an equivalent circuit for ground compensation of a self-generated power supply in a single phase grounding process according to an embodiment of the present application;
FIG. 4 is a simplified equivalent circuit diagram of a self-generated power supply ground compensation in a single phase grounding process according to an embodiment of the present application;
FIG. 5 is a diagram of a single-phase earth-phase self-generating power supply earth compensation composite sequence network according to an embodiment of the present application;
fig. 6 is a flowchart of a voltage regulator fine adjustment method of a self-generating power supply ground fault compensation system compensation adjustment method according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The application is described in further detail below with reference to the attached drawing figures:
example 1
The embodiment of the application provides a self-generating power supply ground fault compensation system compensation adjustment method, which is used in the technical field of single-phase grounding compensation of a neutral point non-grounding system in a power system, and is shown by referring to fig. 1, and the self-generating power supply ground fault compensation system compensation adjustment method comprises the following steps:
101. and obtaining the rated transformation ratio of the phase power supply generator and the rated transformation ratio of the phase power supply phase compensator.
102. And obtaining the equivalent leakage reactance of the phase power supply generator, the equivalent leakage reactance of the phase power supply phase compensator and the equivalent leakage reactance of the voltage regulator.
103. And obtaining the capacitive reactance of the system three relatively distributed capacitors.
104. And acquiring the compensating inductance and inductance of the system, and distributing the capacitance and the parallel impedance of the compensating inductance and inductance of the system three opposite directions.
105. And calculating the reference transformation ratio of the voltage regulator through a reference transformation ratio formula of the voltage regulator.
Specifically, the reference transformation ratio formula of the voltage regulator is as follows:
wherein k is the reference transformation ratio of the voltage regulator, m and n are the rated transformation ratios of the phase power supply generator and the phase power supply phase compensator respectively, X T11 、X T21 、X T31 Equivalent leakage reactance of a phase power supply generator, a phase power supply phase compensator and a voltage regulator respectively, Z L For distributing capacitive reactance of system three relatively, Z when system contains compensating inductance L For the parallel impedance of the system to the ground distributed capacitive reactance and the compensating inductive reactance,when the system contains the compensating inductance, an arc suppression coil grounding mode is adopted.
106. And determining the optimal voltage regulator transformation ratio according to the fine adjustment method of the voltage regulator.
Specifically, the fine adjustment method of the voltage regulator comprises the following steps:
setting the voltage regulator as a reference transformation ratio, and closing a phase compensation switch;
acquiring zero sequence voltage of the system and phase power supply voltage of the system;
judging whether the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range or not;
when the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is in the voltage regulation threshold range, determining the reference transformation ratio of the voltage regulator as the optimal transformation ratio of the voltage regulator corresponding to the system;
when the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude does not fall within a voltage regulation threshold range, regulating the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude falls within the voltage regulation threshold range, and determining the voltage regulator reference transformation ratio at the moment as a voltage regulator optimal transformation ratio;
opening the one-phase compensation switch;
and repeating the steps to determine the optimal variable ratio value of the voltage regulator corresponding to the rest two-phase compensation switches.
Specifically, when the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude does not fall within the voltage regulation threshold range, adjusting the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude falls within the voltage regulation threshold range, and determining the voltage regulator reference transformation ratio at the moment as the voltage regulator optimal transformation ratio includes:
and when the zero sequence voltage amplitude is larger than the phase power supply voltage amplitude, increasing the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range, and determining the voltage regulator reference transformation ratio at the moment as a voltage regulator optimal transformation ratio.
And when the zero sequence voltage amplitude is smaller than the phase power supply voltage amplitude, reducing the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range, and determining the voltage regulator reference transformation ratio as a voltage regulator optimal transformation ratio.
Specifically, the fine adjustment method of the voltage regulator further comprises the step that the voltage adjustment threshold value is 0.1% -1% of the nominal voltage of the system.
The specific calculation process of the reference transformation ratio formula of the voltage regulator is as follows:
referring to fig. 2, a schematic diagram of a self-generated power supply ground fault current compensator is shown; according to the principle of the power system, a self-generated power supply grounding compensation equivalent circuit diagram in single-phase grounding as shown in figure 3 is obtained.Open circuit voltage at no load of line-phase converter and voltage regulator, Z eq Equivalent internal impedance for line-to-phase converter and voltage regulator, < >>For ground fault point current, R jd For the ground resistance, ">Unbalanced power supply Z generated for single-phase grounding of certain phase of system Load Capacitive reactance is distributed for the system to ground. If the ground current is to be compensated completely, in +.>In the process, a simplified equivalent circuit diagram of the self-generated power supply ground compensation in single-phase grounding as shown in fig. 4 is obtained, wherein +.>R jd The branch may be considered to be absent, in which case the equivalent circuit is reduced to that shown in fig. 4.
Referring to fig. 4, the equivalent internal impedance Z of the phase power supply generator and the phase power supply phase compensator and voltage regulator eq The transformer consists of a direct current resistor, an excitation reactance, a leakage reactance and the like of the transformer. Neglecting DC resistance and exciting reactance of transformer, setting X T11 、X T21 、X T31 Winding equivalent leakage reactance of the phase power supply generator, the phase power supply phase compensator and the voltage regulator respectively, m, n and k are the transformation ratios of the phase power supply generator, the phase power supply phase compensator and the voltage regulator respectively, U 0 Is the voltage of the secondary side of the voltage regulator, which is also the neutral point voltage of the system, Z L For distributing capacitive reactance of system three relatively, Z when system contains compensating inductance L The system is characterized in that the system is provided with parallel impedance of capacitive reactance of a capacitor and inductance reactance of a compensation inductor, wherein when the system contains the compensation inductor, an arc suppression coil grounding mode is adopted.
Referring to fig. 1 and fig. 5, when the compensating system is connected to the system for ground compensation, the phase compensator of the phase power supply has a secondary side corresponding to two-phase broken line operation. Setting the phase A to generate single-phase grounding, and enabling the compensation system to realize full compensation so as to lead the neutral point voltage to be uniformLet the output current of the secondary side of the voltage regulator be +.>Then there should be->According to the transformer principle, the primary side current of the voltage regulator is:
in the method, in the process of the application,the primary side three-phase currents of the voltage regulator are respectively.
The primary side current of the voltage regulator transformer is decomposed by a symmetrical component method, which can be known as follows:
in the method, in the process of the application,positive sequence current, negative sequence current and zero sequence current of the primary side A phase current of the voltage regulator respectively.
According to the above conditions, referring to fig. 5, the self-generated power supply ground compensation is performed from the primary side of the voltage regulator to form a system composite sequence network diagram during single-phase grounding, wherein,the open-circuit voltage of the phase compensator for the phase power supply is: />Z 1∑ 、Z 2∑ 、Z 0∑ Is the sum of positive sequence impedance, negative sequence impedance and zero sequence impedance seen from the secondary side of the phase compensator of the phase power supply. And-> Thus, it can be seen that
Further simplifying to obtainSolving the equation to obtain the voltage regulator reference transformation ratio meterThe calculation formula is as follows:
wherein k is the reference transformation ratio of the voltage regulator, m and n are the rated transformation ratios of the phase power supply generator and the phase power supply phase compensator respectively, X T11 、X T21 、X T31 Equivalent leakage reactance of a phase power supply generator, a phase power supply phase compensator and a voltage regulator respectively, Z L For distributing capacitive reactance of system three relatively, Z when system contains compensating inductance L The system is characterized in that the system is provided with parallel impedance of capacitive reactance of a capacitor and inductance reactance of a compensation inductor, wherein when the system contains the compensation inductor, an arc suppression coil grounding mode is adopted.
According to the compensation adjustment method of the self-generating power supply ground fault compensation system, provided by the embodiment of the application, the rated transformation ratio of the phase power supply generator and the rated transformation ratio of the phase power supply phase compensator are obtained; obtaining the equivalent leakage reactance of a phase power supply generator, the equivalent leakage reactance of a phase power supply phase compensator and the equivalent leakage reactance of a voltage regulator; acquiring capacitive reactance of a three-phase relatively distributed capacitor of the system; acquiring compensation inductance and inductance of the system, and distributing capacitance and inductance parallel impedance of the system three-phase relatively; calculating the reference transformation ratio of the voltage regulator through a reference transformation ratio formula of the voltage regulator; according to the fine adjustment method of the voltage regulator, the optimal voltage regulator transformation ratio is determined, and the calculation and adjustment of the voltage regulator adjustment target are achieved through the transformation ratio calculation method and the adjustment method of the voltage regulator, so that powerful compensation adjustment and support are provided for the ground fault current compensation system of the self-generated power supply.
Example two
The following describes the process of calculating the reference transformation ratio of the voltage regulator in conjunction with a specific example.
The leakage reactance parameter of the transformer can be obtained through calculation according to the short-circuit impedance voltage of the transformer, in the embodiment, the nameplate parameters of the phase power supply generator and the phase compensator of the phase power supply are identical, the rated capacity is 6MVA, the primary rated voltage is equal to the secondary rated voltage and is 10kV, the percentage of the short-circuit impedance voltage is 1%, and the rated transformation ratio of the phase power supply generator and the phase compensator of the phase power supply is 1. Neglecting the DC resistance, exciting reactance and iron loss of the transformer, and according to the equivalent circuit of the transformer, the primary side equivalent leakage reactance of the phase power supply generator and the phase power supply phase compensator is as follows:
wherein U is 1E Is the primary rated voltage; i 2k And gamma is the impedance voltage percentage for the secondary rated current.
The rated capacity of the voltage regulator is 2MVA, and the primary rated voltage isThe impedance voltage percentage is 1%, and the equivalent leakage reactance of the voltage regulator is calculated to be 1.67 omega.
The system has a single relative distributed capacitance of 100uF and a capacitance reactance of 10.6 omega
The reference transformation ratio of the voltage regulator is 1.32 according to the reference transformation ratio calculation formula.
According to the embodiment, the obtained reference transformation ratio of the voltage regulator is used for determining the optimal transformation ratio of the voltage regulator according to the fine adjustment method of the voltage regulator, and the calculation and adjustment of the adjustment target of the voltage regulator are achieved through the transformation ratio calculation method and the adjustment method of the voltage regulator, so that powerful compensation adjustment and support are provided for the ground fault current compensation system of the self-generated power supply.
The above is only for illustrating the technical idea of the present application, and the protection scope of the present application is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present application falls within the protection scope of the claims of the present application.
Furthermore, the order in which the elements and sequences are presented, the use of numerical letters, or other designations are used in the application is not intended to limit the sequence of the processes and methods unless specifically recited in the claims. While certain presently useful inventive embodiments have been discussed in the foregoing disclosure, by way of example, it is to be understood that such details are merely illustrative and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements included within the spirit and scope of the embodiments of the application. For example, while the system components described above may be implemented by hardware devices, they may also be implemented solely by software solutions, such as installing the described system on an existing server or mobile device.
Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject application. Indeed, less than all of the features of a single embodiment disclosed above.
Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited herein is hereby incorporated by reference in its entirety. Except for the application history file that is inconsistent or conflicting with this disclosure, the file (currently or later attached to this disclosure) that limits the broadest scope of the claims of this disclosure is also excluded. It is noted that the description, definition, and/or use of the term in the appended claims controls the description, definition, and/or use of the term in this application if there is a discrepancy or conflict between the description, definition, and/or use of the term in the appended claims.
Claims (4)
1. A compensation adjustment method of a self-generated power supply ground fault compensation system is characterized by comprising the following steps:
obtaining a rated transformation ratio of a phase power supply generator and a rated transformation ratio of a phase power supply phase compensator;
obtaining the equivalent leakage reactance of a phase power supply generator, the equivalent leakage reactance of a phase power supply phase compensator and the equivalent leakage reactance of a voltage regulator;
acquiring capacitive reactance of a three-phase relatively distributed capacitor of the system;
acquiring compensation inductance and inductance of the system, and distributing capacitance and inductance parallel impedance of the system three-phase relatively;
calculating the reference transformation ratio of the voltage regulator through a reference transformation ratio formula of the voltage regulator;
according to a fine adjustment method of the voltage regulator, determining an optimal voltage regulator transformation ratio;
the reference transformation ratio formula of the voltage regulator is as follows:
wherein k is the reference transformation ratio of the voltage regulator, m and n are the rated transformation ratios of the phase power supply generator and the phase power supply phase compensator respectively, X T11 、X T21 、X T31 Equivalent leakage reactance of a phase power supply generator, a phase power supply phase compensator and a voltage regulator respectively, Z L For distributing capacitive reactance of system three relatively, Z when system contains compensating inductance L Distributing the parallel impedance of capacitive reactance and compensating inductive reactance for the system to ground;
the fine adjustment method of the voltage regulator comprises the following steps:
setting the voltage regulator as a reference transformation ratio, and closing a phase compensation switch;
acquiring zero sequence voltage of the system and phase power supply voltage of the system;
judging whether the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range or not;
when the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is in the voltage regulation threshold range, determining the reference transformation ratio of the voltage regulator as the optimal transformation ratio of the voltage regulator corresponding to the system;
when the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude does not fall within a voltage regulation threshold range, regulating the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude falls within the voltage regulation threshold range, and determining the voltage regulator reference transformation ratio at the moment as a voltage regulator optimal transformation ratio;
opening the one-phase compensation switch;
and repeating the steps to determine the optimal variable ratio value of the voltage regulator corresponding to the rest two-phase compensation switches.
2. The method for compensating and adjusting a ground fault compensation system of a self-generating power supply according to claim 1, wherein when the system comprises a compensating inductor, an arc suppression coil grounding mode is adopted.
3. The method of claim 1, wherein said adjusting said regulator reference transformation ratio when the difference between said zero sequence voltage magnitude and said phase supply voltage magnitude does not fall within a voltage adjustment threshold range until the difference between said zero sequence voltage magnitude and said phase supply voltage magnitude falls within a voltage adjustment threshold range, and determining said regulator reference transformation ratio at that time as a regulator optimal transformation ratio comprises:
when the zero sequence voltage amplitude is larger than the phase power supply voltage amplitude, the voltage regulator reference transformation ratio is increased until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range, and the voltage regulator reference transformation ratio at the moment is determined to be the voltage regulator optimal transformation ratio;
and when the zero sequence voltage amplitude is smaller than the phase power supply voltage amplitude, reducing the voltage regulator reference transformation ratio until the difference value between the zero sequence voltage amplitude and the phase power supply voltage amplitude is within a voltage regulation threshold range, and determining the voltage regulator reference transformation ratio as a voltage regulator optimal transformation ratio.
4. The method of claim 1, wherein the voltage regulator fine tuning method further comprises the step of adjusting the voltage threshold to be 0.1% -1% of the nominal voltage of the system.
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| CN112054498B (en) * | 2020-09-24 | 2022-09-27 | 云南电网有限责任公司电力科学研究院 | Current-limiting protection method and device of ground fault full-compensation system |
| CN112202181A (en) * | 2020-09-24 | 2021-01-08 | 云南电网有限责任公司电力科学研究院 | Voltage-regulating and voltage-dividing ratio design method of hybrid full-compensation system based on fault phase residual voltage |
| CN112165079B (en) * | 2020-09-24 | 2022-08-02 | 云南电网有限责任公司电力科学研究院 | Method and device for designing current-limiting reactor of ground fault full-compensation system |
| CN112202180B (en) * | 2020-09-24 | 2024-02-06 | 云南电网有限责任公司电力科学研究院 | Full compensation system compensation transformer voltage division ratio design method based on fault phase residual voltage |
| CN112054532B (en) * | 2020-09-24 | 2023-11-21 | 云南电网有限责任公司电力科学研究院 | Design method and device for grounding compensation transformer of full compensation system |
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