CN109932587B - Method for monitoring balance of reactive compensation equipment at user side - Google Patents
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Abstract
The invention relates to the technical field of power distribution network fault monitoring, in particular to a method for monitoring the balance of user side reactive compensation equipment, which comprises the following steps: A) if no tidal current reverse alarm information exists, the step is executed repeatedly, otherwise, the step B is executed; B) if the quantity of the reverse tide data is less than the set value N, returning to the step A; C) reading a user historical load curve, and obtaining a user historical load curve sampling value vector s (s1, s2, …, sn) and a load flow reversal curve sampling value vector p (p1, p2, …, pn), wherein n is the total number of data samples; D) judging whether reverse power flow occurs only in the low load, and entering a step E if the reverse power flow occurs only in the low load; E) and judging whether the ratio Gy of the reverse duration time of the power flow to the duration time of the low load exceeds a threshold Gy, and if so, judging that the balance of the reactive power compensation equipment of the user fails. The substantial effects of the invention are as follows: and unbalanced reactive compensation equipment is found and maintained in time, and the operating efficiency of the power grid is improved.
Description
Technical Field
The invention relates to the technical field of power distribution network fault monitoring, in particular to a method for monitoring the balance of user side reactive compensation equipment.
Background
Reactive compensation is an important way to improve the power factor of the grid. The compensation device is reasonably selected, so that the loss of the power grid can be reduced to the maximum extent, and the quality of the power grid is improved. On the contrary, improper selection or use may cause many consequences such as power supply system, voltage fluctuation, harmonic increase, and the like. Reactive compensation can be divided into the following according to the installation position and the wiring method: high voltage centralized compensation, low voltage grouped compensation and low voltage local compensation. Wherein the local compensation area is the largest and the effect is good. But the total capacitor installation capacity is larger than that of the other two modes, and the utilization rate of the capacitor is low. The capacitor capacity of the high-voltage centralized compensation and the low-voltage grouped compensation is relatively small, the utilization rate is high, and the reactive loss of the transformer can be compensated. At present, a large number of users in a power grid are connected with three capacitors in parallel at the outlet end of an entrance meter to perform low-voltage side centralized compensation. The unbalance of the three reactive compensation capacitors can reduce the compensation effect. However, the balance of the reactive compensation capacitor in operation is difficult to monitor, and is difficult to find and maintain in time. If the balance of reactive compensation capacitor equipment of a user is in a problem, partial reverse tide of the electric energy meter can be caused when the user is under a low load, and abnormal alarm is caused by recording of the three-phase meter. Therefore, the balance of the reactive power compensation equipment can be monitored by analyzing the user load and the reverse power flow information.
Chinese patent CN105896550A, published 2016, 8, 24, a monitoring method for an intelligent reactive power compensation system, the method includes the following steps: s1, a monitoring device acquisition module acquires a voltage instruction issued by a large power grid dispatching center in real time and extracts target grid-connected point voltages of all power generation devices from the voltage instruction; s2, the monitoring device receives the current grid-connected point voltage uploaded by each power generation device and compares the current grid-connected point voltage with a preset interval; s3, if the voltage of the current grid-connected point is in a normal operation interval, the monitoring device controls the power generation device to enter a local control mode; s4, if the voltage of the current grid-connected point is in an abnormal operation interval, the monitoring device controls the power generation device and the corresponding SVC equipment to enter a coordination control mode; and S5, if the voltage of the current grid-connected point is in the emergency operation interval, the monitoring device controls the power generation device and SVC equipment thereof in the emergency operation interval to enter an emergency control mode. The method can realize smooth grid-connected point power and voltage, and maintain and improve the economic operation of the clean energy power generation device. But it does not solve the problem that reactive compensation equipment balance faults are difficult to detect.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: at present, a method for monitoring the balance of reactive compensation equipment at a user side is lacked. The method for monitoring the balance of the reactive compensation equipment at the user side is used for monitoring the load and the load flow reverse alarm of a user three-phase meter and carrying out data analysis to indirectly monitor the balance of the reactive compensation equipment at the user side.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for monitoring the balance of user-side reactive compensation equipment is suitable for users using a three-phase intelligent user meter, and comprises the following steps: A) reading tide reverse alarm information of a user meter according to a period T, if no tide reverse alarm information exists, repeatedly executing the step, otherwise, entering the step B; B) reading reverse tide data of a user meter, if the quantity of the reverse tide data is less than a set value N, returning to the step A, otherwise, entering the step C; C) reading a user historical load curve, respectively sampling the user historical load curve and a power flow reverse curve by setting a sampling frequency fc, and obtaining a user historical load curve sampling value vector s (s1, s2, …, sn) and a power flow reverse curve sampling value vector p (p1, p2, …, pn), wherein n is the total number of data samples, and the power flow reverse curve sampling is obtained by fitting reverse power flow data; D) judging whether reverse power flow occurs only in the low load, if so, entering the step E, otherwise, returning to the step A; E) and D, judging whether the ratio Gy of the reverse duration time of the power flow to the duration time of the low load exceeds a threshold Gy, if so, judging that the balance of the reactive power compensation equipment of the user fails, otherwise, returning to the step A.
Preferably, the method for calculating the ratio gy of the duration of the power flow reversal to the duration of the low load is as follows: E1) recording the element with the element value of 0 in the vector p as 0, and recording the non-zero element as 1 to obtain the vector pb(ii) a E2) The value of the low load element in the vector s is recorded as 1, and the other elements are recorded as 0, so that the vector s is obtainedpCalculating g ═ pb·spAnd gy is g/n.
Preferably, the method for determining the low load is as follows: computing
Find a match kjAll s > σjAnd is incorporated into the set Csjσ is a set constant, σ ∈ [0.18, 0.24 ]]With CsjThe vector s is divided into a plurality of intervals by the element in (1), and each interval is calculatedThe minimum value Sr of the average value is foundminFinding the Sr corresponding to the average value Sr ∈ Srmin±σ*SrminThe element of the user historical load curve sampling value vector s in the low-load interval is the low load.
Preferably, the threshold Gy ∈ [0.65, 0.87], and the value of Gy is smaller in the interval when the capacitance of the reactive compensation capacitor is lower than the ideal value and the proportion of non-zero elements of the vector p is larger.
As a preference, the first and second liquid crystal compositions are,
it is composed of
Wherein: c is the actual reactive compensation capacitance capacity of the user,
Pmaxfor the maximum load power of the user during the monitoring,
to compensate for the tangent value of the front power factor,
for the tangent value of the compensated power factor,/2Is the ratio of the number of non-zero elements of the vector p.
Preferably, the value of σ takes the smaller value in the interval as the ratio of the user annual average load to the user theoretical maximum load is smaller and the sampling frequency fc is larger.
Preferably, σ ═ 0.18+0.06 × u1*u2Wherein: u. of1＝Pu/PA，PuFor the actual annual average load, P, of the userAIs the sum of the rated power of all the loads of the user,
preferably, the user historical load data is obtained by continuously calling the electric quantity of the user meter in a period t when a user generates reverse power flow for the first time, and fitting after the calling data is replaced by the slope of the calling data and the slope of the previous calling data.
The substantial effects of the invention are as follows: the balance condition of the reactive compensation equipment at the user side is indirectly monitored by monitoring the load and the load flow reverse alarm of the three-phase meter of the user and analyzing data, the unbalanced reactive compensation equipment is timely found and maintained, and the operation efficiency of the power grid is improved.
Drawings
Fig. 1 is a flow chart of the method for monitoring the balance of the reactive power compensation equipment at the user side according to the present invention.
Fig. 2 is a flow chart of a method for calculating a ratio of a power flow reversal duration to a low load duration.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
As shown in fig. 1, a flow chart of the method for monitoring the balance of the reactive power compensation equipment at the user side is applicable to users using a three-phase intelligent user meter, and the method comprises the following steps: A) reading tide reverse alarm information of a user meter according to a period T, if no tide reverse alarm information exists, repeatedly executing the step, otherwise, entering the step B; B) reading reverse tide data of a user meter, if the quantity of the reverse tide data is less than a set value N, returning to the step A, otherwise, entering the step C; C) reading a user historical load curve, respectively sampling the user historical load curve and a power flow reverse curve by setting a sampling frequency fc, and obtaining a user historical load curve sampling value vector s (s1, s2, …, sn) and a power flow reverse curve sampling value vector p (p1, p2, …, pn), wherein n is the total number of data samples, and the power flow reverse curve sampling is obtained by fitting reverse power flow data; D) judging whether reverse power flow occurs only in the low load, if so, entering the step E, otherwise, returning to the step A; E) and D, judging whether the ratio Gy of the reverse duration time of the power flow to the duration time of the low load exceeds a threshold Gy, if so, judging that the balance of the reactive power compensation equipment of the user fails, otherwise, returning to the step A.
As shown in figure 2 of the drawings, in which,the flow chart of the method for calculating the ratio of the duration time of the power flow reversal to the duration time of the low load comprises the following steps: E1) recording the element with the element value of 0 in the vector p as 0, and recording the non-zero element as 1 to obtain the vector pb(ii) a E2) The value of the low load element in the vector s is recorded as 1, and the other elements are recorded as 0, so that the vector s is obtainedpCalculating g ═ pb·spAnd gy is g/n.
The low load judgment method comprises the following steps: computing
Find a match kjAll s > σjAnd is incorporated into the set Csjσ is a set constant, σ ∈ [0.18, 0.24 ]]With CsjThe vector s is divided into a plurality of sections by the element(s), the average value Sr of each section is calculated, and the minimum value Sr of the average value is foundminFinding the Sr corresponding to the average value Sr ∈ Srmin±σ*SrminThe element of the user historical load curve sampling value vector s in the low-load interval is the low load.
The threshold Gy is within 0.65 and 0.87, and when the capacity of the reactive compensation capacitor is lower than the ideal value and the proportion of the non-zero elements of the vector p is more, the Gy takes a smaller value in the interval.
When the ratio of the annual average load of the user to the theoretical maximum load of the user is smaller and the sampling frequency fc is larger, the value of the sigma is the smaller value in the interval.
σ＝0.18+0.06*u1*u2Wherein: u. of1＝Pu/PA，PuFor the actual annual average load, P, of the userAIs the sum of the rated power of all the loads of the user,
and when the user historical load data is that a user firstly generates reverse tide, the electric quantity of the user meter is continuously called and measured in a period t, and the calling and measuring data is obtained by fitting after replacing the slope of the calling and measuring data with the slope of the previous calling and measuring data.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (5)
1. A method for monitoring the balance of reactive compensation equipment at user side is suitable for users using three-phase intelligent user meter,
the method comprises the following steps:
A) reading tide reverse alarm information of a user meter according to a period T, if no tide reverse alarm information exists, repeatedly executing the step, otherwise, entering the step B;
B) reading reverse tide data of a user meter, if the quantity of the reverse tide data is less than a set value N, returning to the step A, otherwise, entering the step C;
C) reading a user historical load curve, respectively sampling the user historical load curve and a power flow reverse curve by setting a sampling frequency fc, and obtaining a user historical load curve sampling value vector s (s1, s2, …, sn) and a power flow reverse curve sampling value vector p (p1, p2, …, pn), wherein n is the total number of data samples, and the power flow reverse curve sampling is obtained by fitting reverse power flow data;
D) judging whether reverse power flow occurs only in the low load, if so, entering the step E, otherwise, returning to the step A;
E) judging whether the ratio Gy of the reverse duration time of the power flow to the duration time of the low load exceeds a threshold Gy, if so, judging that the balance of the reactive compensation equipment at the user side fails, otherwise, returning to the step A;
the method for calculating the ratio gy of the duration time of the power flow reversal to the duration time of the low load comprises the following steps:
E1) recording the element with the element value of 0 in the vector p as 0, and recording the non-zero element as 1 to obtain the vector pb；
E2) The value of the low load element in the vector s is recorded as 1, and the other elements are recorded as 0, so that the vector s is obtainedpCalculating g ═ pb·spAnd gy is g/n.
2. The method for monitoring the balance of the reactive compensation equipment at the user side according to claim 1,
the low load judgment method comprises the following steps:
computing
Find a match kjAll s > σjAnd is incorporated into the set Csjσ is a set constant, σ ∈ [0.18, 0.24 ]]With CsjThe vector s is divided into a plurality of sections by the element(s), the average value Sr of each section is calculated, and the minimum value Sr of the average value is foundminFinding the Sr corresponding to the average value Sr ∈ Srmin±σ*SrminThe element of the user historical load curve sampling value vector s in the low-load interval is the low load.
3. The method for monitoring the balance of the reactive compensation equipment at the user side according to claim 1,
the threshold Gy is within 0.65 and 0.87, and when the capacity of the reactive compensation capacitor is lower than an ideal value and the proportion of non-zero elements of the vector p is more, the Gy takes a smaller value in an interval.
4. The method for monitoring the balance of the reactive compensation equipment at the user side according to claim 3,
it is composed of
Wherein: c is the actual reactive compensation capacitance capacity of the user,
Pmaxfor the maximum load power of the user during the monitoring,
to compensate for the tangent value of the front power factor,
for the tangent value of the compensated power factor,/2Is the ratio of the number of non-zero elements of the vector p.
5. The method for monitoring the balance of the reactive compensation equipment at the user side according to claim 2,
when the ratio of the annual average load of the user to the theoretical maximum load of the user is smaller and the sampling frequency fc is larger, the value of the sigma is the smaller value in the interval.
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