CN117239686A - Inter-turn protection method and device for high-voltage shunt reactor - Google Patents
Inter-turn protection method and device for high-voltage shunt reactor Download PDFInfo
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Abstract
The turn-to-turn protection method and device for the high-voltage shunt reactor are characterized by comprising the following steps of: collecting real-time current and real-time voltage of the high-voltage shunt reactor, and calculating zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor; calculating a real-time magnetic linkage after the real-time voltage mutation according to the real-time voltage of the high-voltage shunt reactor, so as to identify and eliminate the situation that the high-voltage shunt reactor is saturated by an iron core; and detecting whether the high-voltage shunt reactor simultaneously meets a zero-sequence direction protection criterion and a zero-sequence impedance protection criterion or not based on the zero-sequence current and the zero-sequence voltage of the high-voltage shunt reactor, and triggering inter-turn protection action when the two criteria are simultaneously met. The method is accurate and effective, and can accurately distinguish the saturation and inter-turn faults of the reactor at the moment of voltage abrupt change, thereby overcoming the problem of inter-turn protection misoperation caused by iron core saturation.
Description
Technical Field
The application relates to the field of relay protection, in particular to a turn-to-turn protection method and device for a high-voltage shunt reactor.
Background
At present, along with the continuous expansion of offshore wind power and the continuous perfection of a double-high power grid, the dependence of a power system on ultra-high voltage, long-distance and large-capacity power transmission is also continuously improved. The high-voltage shunt reactor is used as an effective means and key equipment for reactive compensation and overvoltage suppression of the system, and the reliability and sensitivity of the protection method have important significance for ensuring safe and reliable transmission of electric energy. The current protection method of the high-voltage shunt reactor mainly adopts zero-sequence power direction protection, and can not accurately distinguish turn-to-turn faults of the reactor from high-resistance saturation, thereby bringing hidden danger and threat to safe and stable operation of the reactor.
Because the inter-turn protection of the reactor can not distinguish the inter-turn fault and the saturation, the malfunction of the inter-turn protection caused by the saturation is generally prevented by increasing the starting condition or the saturation locking condition of the inter-turn protection. In an ideal state, the high sensitivity of the reactor in turn-to-turn short circuit is considered, and the situation that the reactor is not in misoperation under saturation conditions such as empty charge and the like is considered, but the two are in contradiction. The use of zero sequence voltage and zero sequence current thresholds as inter-turn protection start conditions requires repeated adjustments and even configuration of different thresholds for different conditions to seek balance between the two. Harmonic blocking methods also present such problems, and may also be affected by harmonic contamination of the power electronics.
The inter-turn protection applied by the current engineering has higher false operation probability, the protection method can play a role in protecting inter-turn faults, but as the complexity of the power grid is continuously increased, the inter-turn protection false operation case of the reactor has been repeatedly generated in recent years, such as 500kV cloud-to-line power transmission test of the Minyue networking engineering in 2022, and the inter-turn protection false operation of the reactor occurs in the process of jumping off and reclosing of the single-phase switch of the analog circuit; and the wind power 220kW long reef variable line no-load switching on occurs the turn-to-turn protection misoperation of the reactor in 2021 Zhejiang sea. Most of the cases of protection misoperation are that turn-to-turn faults and saturation of the reactor cannot be distinguished accurately, and turn-to-turn protection misoperation is caused when the reactor is saturated. The reason for this is that the reactor is saturated, and the magnetic flux in the iron core exceeds the linear working area and enters the nonlinear area.
Background art literature: the research of the method for preventing the saturation misoperation of the turn-to-turn protection of the high-voltage shunt reactor, the wearing of the shunt reactor, etc., the power grid technology, volume 45 in 2021. The open criterion for calculating inductance fluctuation based on windings is disclosed, the criterion realizes accurate identification of high-resistance saturated inter-turn short circuit, and reliable open protection action can be realized when high-resistance inter-turn short circuit fault and saturation occur simultaneously. However, the above criteria still have the problems of complex criteria logic and large calculation amount.
In view of the above, there is a need for a method and apparatus for turn-to-turn protection of a high voltage shunt reactor.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a turn-to-turn protection method and device for a high-voltage shunt reactor, which accurately judges turn-to-turn faults and protects the same by identifying the core saturation state of the reactor to preferentially exclude the core saturation situation of the high-voltage shunt reactor. The judgment of the iron core saturation is obtained according to comparison between the real-time flux linkage of the reactor in the voltage abrupt change period and the saturation value of the reactor.
The application adopts the following technical scheme.
The application relates to a turn-to-turn protection method of a high-voltage shunt reactor, which comprises the following steps: step 1, collecting real-time current and real-time voltage of a high-voltage shunt reactor, and calculating zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor; step 2, calculating a real-time magnetic linkage after the real-time voltage mutation according to the real-time voltage of the high-voltage shunt reactor, so as to identify and eliminate the situation that the high-voltage shunt reactor is saturated by an iron core; and step 3, detecting whether the high-voltage shunt reactor simultaneously meets a zero-sequence direction protection criterion and a zero-sequence impedance protection criterion based on zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor, and triggering inter-turn protection action when simultaneously meeting the two criteria.
Preferably, identifying and excluding the situation that the high-voltage shunt reactor is saturated with the iron core includes: collecting saturation parameters of the high-voltage shunt reactor, wherein the saturation parameters at least comprise saturation magnetic flux density of the high-voltage shunt reactor, winding cross-sectional area of the reactor and winding turns of the reactor; calculating an iron core flux linkage saturation value of the high-voltage shunt reactor according to the saturation parameters; when the real-time flux linkage after the real-time voltage mutation is larger than the iron core flux linkage saturation value, the iron core saturation of the high-voltage shunt reactor is judged.
Preferably, when it is determined that the high-voltage shunt reactor is saturated in the core, the inter-turn protection is blocked.
Preferably, the real-time voltage ramp comprises: the real-time voltage changes at least one of the phase and amplitude before and after the abrupt change, and the changing amplitude exceeds a preset threshold.
Preferably, the real-time voltage before the abrupt change is:
the real-time voltage after mutation is:
wherein k is 1 U m And k 2 U m The amplitude of the real-time voltage alternating current components before and after abrupt change respectively,
and->The phases of the real-time voltage alternating current components before and after abrupt change respectively,
t 0 in order to achieve the moment of the abrupt change,
ω is the angular frequency of the real-time voltage ac component,
as an aperiodic component of the abrupt real-time voltage,
for the initial amplitude of the non-periodic component, +.>Is an attenuation characteristic of the non-periodic component,
and has
Preferably, according to the real-time voltage before mutation and the real-time voltage after mutation, calculating the real-time flux linkage after mutation; wherein the real-time flux linkage comprises a real-time voltage u before the abrupt change in the first half period 1 (t) accumulating the obtained real-time flux linkage component, and passing the abrupt change real-time voltage u in a short time after abrupt change 2 (t) accumulating the resulting real-time flux linkage component between the abrupt change time and the real-time measurement time; wherein the real-time voltage u 1 (t) the real-time flux-linkage component accumulated is an aperiodic flux-linkage component, and the real-time voltage u 2 In (t) The real-time flux linkage component accumulated between the abrupt change time and the real-time measurement time is taken as a periodic component, and the real-time voltage u 2 In (t)>This part accumulates the real-time flux linkage component between the abrupt moment and the real-time measurement moment as an aperiodic component.
Preferably, the real-time flux linkage is:
wherein T is the period of the real-time voltage before and after abrupt change,
t is the current time of day and,
u (eta) is the real-time voltage,
η is a parameter of the integration operation.
Preferably, the zero sequence direction protection criterion is:
wherein,and X L0 The zero-sequence voltage fundamental phasor, the zero-sequence current fundamental phasor and the zero-sequence impedance including neutral point reactance of the high-voltage shunt reactor are respectively adopted, and k is 0.9.
Preferably, the zero sequence impedance protection criterion is:
wherein,and X L0 Respectively are connected in parallel with high voltageZero-sequence voltage fundamental phasor, zero-sequence current fundamental phasor, zero-sequence impedance including neutral reactance, k of reactor m 0.7.
The application relates to a turn-to-turn protection device of a high-voltage shunt reactor, which comprises an acquisition module, an estimation module and an action module; the acquisition module is used for acquiring real-time current and real-time voltage of the high-voltage shunt reactor and calculating zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor; the calculation module is used for calculating a real-time magnetic linkage after the real-time voltage mutation according to the real-time voltage of the high-voltage shunt reactor so as to identify and eliminate the situation that the high-voltage shunt reactor is saturated by an iron core; the action module is used for detecting whether the high-voltage shunt reactor simultaneously meets the zero-sequence direction protection criterion and the zero-sequence impedance protection criterion based on the zero-sequence current and the zero-sequence voltage of the high-voltage shunt reactor, and triggering turn-to-turn protection action when the two criteria are simultaneously met.
Compared with the prior art, the inter-turn protection method and device for the high-voltage parallel reactor have the advantages that inter-turn faults are accurately judged and protected by preferentially eliminating the core saturation of the high-voltage parallel reactor. The judgment of the iron core saturation is obtained according to comparison between the real-time flux linkage of the reactor in the voltage abrupt change period and the saturation value of the reactor. The method is accurate and effective, and can accurately distinguish whether the actual state of the reactor at the moment of voltage abrupt change is core saturation or inter-turn short circuit, thereby overcoming the problem of inter-turn protection misoperation caused by core saturation.
The beneficial effects of the application also include:
1. the method can judge the iron core saturation more quickly and accurately in a half period through reasonably setting the iron core saturation state criterion. The calculation process of the criterion is very simple, and only an integration algorithm is adopted to obtain the integral quantity of the voltage in less than one period before and after voltage mutation. This way of calculation saves a lot of time for the following criteria, without causing a timeout of the inter-turn protection.
2. If the method for judging the saturation state of the iron core is reasonably applied to the protection of other inductance devices needing to eliminate saturation interference, the iron core saturation can be rapidly identified, and the protection speed is improved.
Drawings
Fig. 1 is a schematic diagram of steps of an inter-turn protection method of a high-voltage shunt reactor according to the present application;
fig. 2 is a schematic diagram of a real-time flux linkage equivalent circuit of a reactor in an inter-turn protection method of a high-voltage shunt reactor according to the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. The described embodiments of the application are only some, but not all, embodiments of the application. All other embodiments of the application not described herein, which are obtained from the embodiments described herein, should be within the scope of the application by those of ordinary skill in the art without undue effort based on the spirit of the present application.
Fig. 1 is a schematic diagram of steps of an inter-turn protection method of a high-voltage shunt reactor according to the present application. As shown in fig. 1, the first aspect of the present application relates to a turn-to-turn protection method of a high-voltage shunt reactor, which includes steps 1 to 3.
And step 1, collecting real-time current and real-time voltage of the high-voltage shunt reactor, and calculating zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor.
Fig. 2 is a schematic diagram of a real-time flux linkage equivalent circuit of a reactor in an inter-turn protection method of a high-voltage shunt reactor according to the present application. As shown in fig. 2, the reactors mentioned in the present application are all reactors connected in parallel with high voltage, and such reactors are important devices for reactive power compensation and overvoltage suppression of the system.
The method of the application can be deployed on devices with protection function, and the devices can carry a plurality of CTs and PTs to collect the voltage and the current on the reactor to be protected or the connecting line of the reactor.
By adopting the mode in the prior art, the method can further analyze and calculate the collected three-phase voltage and three-phase current, for example, calculate the zero sequence current and zero sequence voltage of the reactor.
Likewise, the application also supports the advance acquisition of each key parameter of the reactor, for example, the parameters can comprise the number of turns, saturation magnetic flux density and the like of the reactor, which are relatively fixed after the manufacturing of the reactor is completed, and the parameters can also be applied to the subsequent judging step as the basis of judgment. This part will be described in more detail in step 2.
And 2, calculating a real-time magnetic linkage after the real-time voltage mutation according to the real-time voltage of the high-voltage shunt reactor, so as to identify and eliminate the situation that the high-voltage shunt reactor is saturated by an iron core.
The method can overcome the misoperation of the protection equipment caused by the interference of saturation on turn-to-turn protection after eliminating the saturation of the high-voltage shunt reactor iron core in the step 2. In addition, if core saturation is identified, the method may lock-out inter-turn protection.
In the application, the problem that the current is instantaneously increased when the reactor is saturated and has inter-turn short circuit is considered, so that the conventional inter-turn protection is easy to cause misoperation. In order to overcome this problem, the present application mentions a scheme of identifying the saturation of the reactor core in advance.
Preferably, the method for identifying and eliminating the iron core saturation situation of the high-voltage shunt reactor further comprises the following steps: collecting saturation parameters of the high-voltage shunt reactor, wherein the saturation parameters at least comprise saturation magnetic flux density of the high-voltage shunt reactor, winding cross-sectional area of the reactor and winding turns of the reactor; calculating an iron core flux linkage saturation value of the high-voltage shunt reactor according to the saturation parameters; when the real-time flux linkage after the real-time voltage mutation is larger than the iron core flux linkage saturation value, the iron core saturation of the high-voltage shunt reactor is judged.
It will be appreciated that in the present application, a saturation parameter may be pre-designed as a criterion. For example, in one embodiment of the present application, the core flux linkage saturation value may be calculated. It is easily conceivable that the index can be obtained by multiplying the saturation magnetic flux density of the reactor, the winding cross-sectional area of the reactor, and the number of turns of the winding of the reactor.
On this basis, if the real-time flux linkage caused by the abrupt voltage is greater than the saturation value, it is indicated that core saturation occurs. If the value is smaller than the saturation value, the situation that the iron core is saturated is eliminated, and the method can realize turn-to-turn protection according to the method in the step 3. If it is determined that saturation occurs, the method cannot continue to perform inter-turn protection in step 3.
Preferably, when the high-voltage shunt reactor is judged to be saturated, the inter-turn protection is locked in order to avoid misoperation caused by interference of the core saturation on the inter-turn protection.
Preferably, the real-time voltage ramp comprises: the real-time voltage changes at least one of the phase and amplitude before and after the abrupt change, and the changing amplitude exceeds a preset threshold.
It will be appreciated that the real-time flux linkage is based on the integration of the voltage across the reactor over time. Since the voltages before and after the mutation are instantaneously changed, that is, the voltage before the mutation is different from the voltage after the mutation in magnitude or phase. Before the abrupt change, the method may assume that the voltage across the reactor is a standard ac voltage, and when saturation occurs, the method may assume that the voltage across the reactor has a dc-like component that decays from the moment of the abrupt change in addition to the ac voltage.
Although the flux linkage is the integral of voltage, no matter the AC component or the attenuated DC, the characteristic of the flux linkage is unchanged after integration, so the method can firstly assume a plurality of parameters to respectively characterize the property of the flux linkage before and after mutation and realize the formula expression of the flux linkage before and after mutation.
The flux linkage before mutation is:
in the above formula, ψ m Is steady stateThe flux linkage amplitude is fixed when the voltage is a normal periodic voltage, and if the voltage amplitude changes, the flux linkage amplitude does not change suddenly. K, k 1 The change in amplitude is characterized for the flux linkage coefficient. k (k) 1 The value range of (2) is [0,1 ]]. It can be seen that the magnitude of the ac amplitude of the flux linkage is actually-k 1 ψ m In view of the integral operation, there is also a DC component A on the flux linkage 1 . In this formula, t 0 For the moment of abrupt change, t represents time, ω is angular frequency,for the initial phase of the voltage jump before saturation occurs, < >>
Similarly, the method may also express the following formula of the flux linkage after mutation:
in the above formula, -k 2 ψ m Is of amplitude, k 2 Is a value range of k 1 The same applies. θ is the offset of the voltage phase before and after the abrupt change,the non-periodic component in the flux linkage is also understood to be the abnormal flux linkage variation due to abrupt change, actually caused by voltage abrupt change.
Considering that the voltage jump is similar to a gradually decaying dc component during core saturation, the method can be designed toWherein A is 2 For initial abrupt amplitude of flux linkage, τ can thenTo characterize the rate of decay.
Considering that the application designs the expression of each parameter by taking the flux linkage as the basis, the voltage before and after mutation can also be designed according to the parameters.
Preferably, derivation is performed on the flux linkage formulas before and after mutation, and the real-time voltage before mutation is obtained respectively as follows:
and, the real-time voltage after the abrupt change is:
wherein k is 1 U m And k 2 U m The amplitudes of the real-time voltage alternating current components before and after abrupt change are respectively obtained.
And->The phases of the real-time voltage alternating current components before and after abrupt change respectively,
t 0 in order to achieve the moment of the abrupt change,
ω is the angular frequency of the real-time voltage ac component,
as an aperiodic component of the abrupt real-time voltage,
for the initial amplitude of the non-periodic component, +.>Is an attenuation characteristic of the non-periodic component and has +.>
It is understood that, in the present application, although the voltage is suddenly changed, the flux linkage accumulation amount is not actually suddenly changed before and after the voltage is suddenly changed, and thus, the sudden change time t 0 The two flux linkage formulas are equal, i.e. ψ 1 (t 0 )＝ψ 2 (t 0 ). Simultaneous equations are performed according to the above formulas, and can be solved to obtain
For the formula, the method can judge the magnitude of the real-time flux linkage before and after the abrupt change according to the formula, and based on the magnitude, the estimation of whether the reactor is saturated or not is realized.
Preferably, according to the real-time voltage before mutation and the real-time voltage after mutation, the real-time flux linkage before and after mutation of the real-time voltage is calculated; wherein the real-time flux linkage comprises a real-time voltage u before the abrupt change in the first half period 1 (t) accumulating the obtained real-time flux linkage component, and passing the abrupt change real-time voltage u in a short time after abrupt change 2 (t) accumulating the resulting real-time flux linkage component between the abrupt change time and the real-time measurement time; wherein the real-time voltage u 1 (t) the real-time flux-linkage component accumulated is an aperiodic flux-linkage component, and the real-time voltage u 2 In (t) The real-time flux linkage component accumulated between the abrupt change time and the real-time measurement time is taken as a periodic component, and the real-time voltage u 2 In (t)>This part accumulates the real-time flux linkage component between the abrupt moment and the real-time measurement moment as an aperiodic component.
It can be understood that the periodic component in the real-time flux linkage has a relatively stable amplitude, and the non-periodic component affects the total real-time flux linkage to a greater extent according to the actual condition of the reactor saturation, such as the saturation time, the attenuation speed of the non-periodic component voltage, and other factors. Therefore, whether the reactor is saturated or not can be obtained by tracking and measuring the magnitude of the real-time flux linkage.
On this basis, the method measures the flux linkage accumulated by voltages whose abrupt changes include an aperiodic component and a normal alternating current component. Thus, the method can track t from the moment of mutation 0 During a brief period of time, the voltage magnitude at each point in time is added to the calculation of the flux linkage.
If the voltage does not suddenly change or only slightly changes, the flux linkage value at the moment does not exceed the pre-designed index, and if the voltage suddenly changes, the flux linkage value at the moment exceeds the pre-designed flux linkage saturation value, so that a corresponding feedback alarm or signal is sent.
Preferably, the real-time flux linkage is:
wherein T is the period of the real-time voltage before and after abrupt change,
t is the current time of day and,
u (eta) is the real-time voltage
η is a parameter of the integration operation.
If the method judges that the reactor is saturated, the inter-turn protection logic is shielded, namely the inter-turn protection logic is locked. If the method monitors that the reactor is not saturated or is suspected, the method enters inter-turn protection logic in time, and according to the state of other criteria obtained through simultaneous judgment, inter-turn protection action is realized.
And step 3, detecting whether the high-voltage shunt reactor simultaneously meets a zero-sequence direction protection criterion and a zero-sequence impedance protection criterion based on zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor, and triggering inter-turn protection action when simultaneously meeting the two criteria.
After the method eliminates the saturation interference, the method can realize effective inter-turn protection according to other criteria of inter-turn protection.
In an embodiment of the present application, the criteria of inter-turn protection include a zero-sequence direction protection criterion and a zero-sequence impedance protection criterion. The zero sequence direction protection criterion is compensation type amplitude comparison type zero sequence direction protection.
Preferably, the zero sequence direction protection criterion is:
wherein,and X L0 The zero-sequence voltage fundamental phasor, the zero-sequence current fundamental phasor and the zero-sequence impedance including neutral point reactance of the high-voltage shunt reactor are respectively, and k is a proportionality coefficient and is a certain value. In one embodiment of the application, k has a value of 0.9, defined by a number of measurement reasoning and test data.
Preferably, the zero sequence impedance protection criterion is:
wherein,and X L0 Zero-sequence voltage fundamental phasor, zero-sequence current fundamental phasor and neutral-point reactance of high-voltage shunt reactor respectivelyZero sequence impedance, k in m The ratio is a constant value. In one embodiment of the application, k m 0.7.
And carrying out logic operation on each criterion result through a logic circuit, wherein the turn-to-turn protection only acts if two conditions are met at the same time, and the turn-to-turn protection cannot act if any one condition is not met.
Therefore, the application can accurately identify the saturation phenomenon occurring when the operation condition of the reactor changes, thereby locking the turn-to-turn protection; meanwhile, the data window length of the judging method is only half period, so that the speed of judging the saturation of the reactor is greatly improved, the reliability of the existing inter-turn protection is improved, and the rapidity of the existing inter-turn protection is not influenced.
The application relates to a turn-to-turn protection device of a high-voltage shunt reactor, which comprises an acquisition module, an estimation module and an action module; the acquisition module is used for acquiring real-time current and real-time voltage of the high-voltage shunt reactor and calculating zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor; the calculation module is used for calculating a real-time magnetic linkage after the real-time voltage mutation according to the real-time voltage of the high-voltage shunt reactor so as to identify and eliminate the situation that the high-voltage shunt reactor is saturated by an iron core; the action module is used for detecting whether the high-voltage shunt reactor simultaneously meets the zero-sequence direction protection criterion and the zero-sequence impedance protection criterion based on the zero-sequence current and the zero-sequence voltage of the high-voltage shunt reactor, and triggering turn-to-turn protection action when the two criteria are simultaneously met.
It may be understood that, in order to implement each function in the method provided in the embodiment of the present application, the turn-to-turn protection device includes a hardware structure and/or a software module that perform each function. Those of skill in the art will readily appreciate that the various illustrative algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The embodiment of the application can divide the functional modules of the inter-turn protection device according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.
The inter-turn protection device includes at least one processor, a bus system, and at least one communication interface. The processor is comprised of a central processing unit, field programmable gate array, application specific integrated circuit, or other hardware. The memory is composed of a read-only memory, a random access memory and the like. The memory may be stand alone and coupled to the processor via a bus. The memory may also be integrated with the processor. The hard disk can be a mechanical disk or a solid state disk, etc. The embodiment of the present application is not limited thereto. The above embodiments are typically implemented in software, hardware. When implemented using a software program, may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions.
When the computer program instructions are loaded and executed on a computer, the corresponding functions are implemented according to the procedures provided by the embodiments of the present application. The computer program instructions referred to herein may be assembly instructions, machine instructions, or code written in a programming language implementation, or the like.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (10)
1. An inter-turn protection method of a high-voltage shunt reactor, which is characterized by comprising the following steps:
step 1, collecting real-time current and real-time voltage of the high-voltage shunt reactor, and calculating zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor;
step 2, calculating a real-time magnetic linkage after the real-time voltage mutation according to the real-time voltage of the high-voltage shunt reactor, so as to identify and eliminate the situation that the high-voltage shunt reactor is saturated by an iron core;
and 3, detecting whether the high-voltage shunt reactor simultaneously meets a zero-sequence direction protection criterion and a zero-sequence impedance protection criterion based on the zero-sequence current and the zero-sequence voltage of the high-voltage shunt reactor, and triggering turn-to-turn protection action when the two criteria are simultaneously met.
2. The method for protecting the turn-to-turn of the high-voltage shunt reactor according to claim 1, wherein the method comprises the following steps:
the identifying and eliminating the situation that the high-voltage shunt reactor is saturated in the iron core comprises the following steps:
collecting saturation parameters of the high-voltage shunt reactor, wherein the saturation parameters at least comprise saturation magnetic flux density of the high-voltage shunt reactor, winding cross-sectional area of the reactor and winding turns of the reactor;
calculating an iron core flux saturation value of the high-voltage shunt reactor according to the saturation parameter;
and when the real-time flux linkage after the real-time voltage mutation is larger than the iron core flux linkage saturation value, judging that the high-voltage shunt reactor is saturated.
3. The method for protecting the turn-to-turn of the high-voltage shunt reactor according to claim 2, wherein the method comprises the following steps:
and when the high-voltage shunt reactor is judged to be saturated, locking inter-turn protection.
4. The method for protecting the turn-to-turn of the high-voltage shunt reactor according to claim 2, wherein the method comprises the following steps:
the real-time voltage ramp comprises:
the real-time voltage changes at least one of the phase and the amplitude before and after the abrupt change, and the amplitude of the change exceeds a preset threshold.
5. The method for protecting the turn-to-turn of the high-voltage shunt reactor according to claim 4, wherein the method comprises the following steps:
the real-time voltage before abrupt change is:
the real-time voltage after mutation is:
wherein k is 1 U m And k 2 U m The amplitude of the real-time voltage alternating current components before and after abrupt change respectively,
and->The phases of the real-time voltage alternating current components before and after abrupt change respectively,
t 0 in order to achieve the moment of the abrupt change,
ω is the angular frequency of the real-time voltage ac component,
for real time after mutationThe non-periodic component of the voltage is,
for the initial amplitude of the non-periodic component, < >>As an attenuation characteristic of the non-periodic component,
and has
6. The method for protecting the turn-to-turn of the high-voltage shunt reactor according to claim 5, wherein the method comprises the following steps:
calculating a real-time flux linkage after mutation according to the real-time voltage before mutation and the real-time voltage after mutation;
wherein the real-time flux linkage comprises the real-time voltage u before the abrupt change in the first half period 1 (t) accumulating the resulting real-time flux linkage component, passing the abrupt change of the real-time voltage u in a short time after the abrupt change 2 (t) accumulating the resulting real-time flux linkage component between the abrupt change time and the real-time measurement time;
wherein the real-time voltage u 1 (t) the accumulated real-time flux linkage component is an aperiodic flux linkage component,
the real-time voltage u 2 In (t)This part accumulates the real-time flux linkage component obtained between the abrupt timing and the real-time measurement timing as a periodic component,
the real-time voltage u 2 In (t)The part accumulates the real-time magnetic field obtained between the abrupt change time and the real-time measurement timeThe chain component is an aperiodic component.
7. The method for protecting the turn-to-turn of the high-voltage shunt reactor according to claim 6, wherein the method comprises the following steps:
the real-time flux linkage is as follows:
wherein T is the period of the real-time voltage before and after abrupt change,
t is the current time of day and,
u (eta) is the real-time voltage,
η is a parameter of the integration operation.
8. The method for protecting the turn-to-turn of the high-voltage shunt reactor according to claim 1, wherein the method comprises the following steps:
the zero sequence direction protection criterion is as follows:
wherein,and X L0 The zero-sequence voltage fundamental phasor, the zero-sequence current fundamental phasor and the zero-sequence impedance including neutral point reactance of the high-voltage shunt reactor are respectively obtained, and k is 0.9.
9. The method for protecting the turn-to-turn of the high-voltage shunt reactor according to claim 1, wherein the method comprises the following steps:
the zero sequence impedance protection criterion is as follows:
wherein,and X L0 The zero-sequence voltage fundamental phasor, the zero-sequence current fundamental phasor and the zero-sequence impedance including neutral point reactance of the high-voltage shunt reactor are respectively k m 0.7.
10. The turn-to-turn protection device of the high-voltage shunt reactor is characterized in that:
the device comprises an acquisition module, a calculation module and an action module; wherein,
the acquisition module is used for acquiring real-time current and real-time voltage of the high-voltage shunt reactor and calculating zero-sequence current and zero-sequence voltage of the high-voltage shunt reactor;
the calculation module is used for calculating a real-time magnetic linkage after the real-time voltage mutation according to the real-time voltage of the high-voltage shunt reactor so as to identify and eliminate the situation that the high-voltage shunt reactor is saturated by an iron core;
the action module is used for detecting whether the high-voltage shunt reactor simultaneously meets the zero-sequence direction protection criterion and the zero-sequence impedance protection criterion or not based on the zero-sequence current and the zero-sequence voltage of the high-voltage shunt reactor, and triggering turn-to-turn protection action when the two criteria are simultaneously met.
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