Transformer substation control method based on voltage signal analysis

Abstract

The invention provides a transformer substation control method based on voltage signal analysis. The transformer substation control method comprises the following steps: step (1), collecting an incoming line voltage signal and an incoming line current signal of a transformer substation; (2) performing preliminary control according to the incoming line voltage signal and the incoming line current signal; step (3), voltage signals of all nodes of the transformer substation are collected; step (4), calculating a voltage predicted value of each node; step (5), establishing a control optimization target of the transformer substation; step (6), establishing control constraint conditions of the transformer substation; (7) collecting the reactive voltage of the transformer substation; and (8) determining the control condition of the transformer substation according to the reactive voltage. According to the transformer substation control method based on voltage signal analysis, the reactive voltage of the transformer substation can be effectively adjusted in real time according to the actual working condition, and the stability of the transformer substation is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power detection and control, and in particular relates to a substation control method based on voltage signal analysis. Background Art

[0002] With the continuous development of science and technology, more and more power equipment is used in production or life. Due to the use of nonlinear devices in new equipment, the stability of substations becomes lower, which has a certain impact or even harm to users' electricity consumption.

[0003] The present invention proposes a substation control method based on voltage signal analysis, which performs preliminary control according to the collected incoming line voltage signal and incoming line current signal, calculates the voltage of each node, and then establishes control optimization objectives and constraints according to the voltage signal of each node, repeatedly controls until the reactive voltage of the substation is effectively controlled, thereby realizing real-time and effective adjustment of the reactive voltage of the substation. Summary of the invention

[0004] The present invention provides a substation control method based on voltage signal analysis, which can effectively adjust the reactive voltage of the substation in real time according to actual working conditions, thereby improving the stability of the substation.

[0005] The present invention is specifically a substation control method based on voltage signal analysis, and the substation control method comprises the following steps:

[0006] Step (1): collecting the incoming line voltage signal and the incoming line current signal of the substation;

[0007] Step (2): performing preliminary control according to the incoming line voltage signal and the incoming line current signal;

[0008] Step (3): collecting voltage signals of various nodes of the substation;

[0009] Step (4): Calculate the predicted voltage value of each node;

[0010] Step (5): establishing the substation control optimization target;

[0011] Step (6): establishing the substation control constraint conditions;

[0012] Step (7): collecting reactive voltage of the substation;

[0013] Step (8): Determine the substation control status according to the reactive voltage.

[0014] The specific method for performing preliminary control according to the incoming line voltage signal and the incoming line current signal is:

[0015] Determine whether the incoming line voltage signal is within the voltage reference range. If not, control the substation incoming line switch to disconnect; if so, determine whether the incoming line current signal is within the current reference range. If not, control the substation incoming line switch to disconnect. If so, keep the working state of the substation incoming line switch unchanged.

[0016] The specific algorithm for calculating the predicted value of each node voltage is:

[0017] First, retrieve N voltage signal values ​​of each node before and after the same time of the previous day;

[0018] Secondly, the average value of N voltage signal values ​​before and after the same time of each node on the previous day is calculated as the voltage prediction value of each node.

[0019] The substation control optimization goal is to take the voltage prediction value control deviation of the substation voltage signal at time t in the future T time period as the minimum value, specifically: Among them U c is the voltage prediction value, U 0 is the voltage reference value.

[0020] The specific method for establishing the substation control constraint condition is:

[0021] Among them U min is the lower limit of the voltage signal, U max is the upper limit of the voltage signal, W min is the lower limit of the active output of the reactive power compensator, W max is the upper limit of active output of reactive power compensator, W N It is the initial value of active output of reactive power compensator.

[0022] The specific method for determining the control status of the substation according to the reactive voltage is:

[0023] Determine whether the reactive voltage is within the reactive voltage reference range. If so, maintain the current control state. If not, return to step (3) and continue to collect voltage signals of each node for new control.

[0024] Compared with the prior art, the beneficial effect is: the substation control method first performs preliminary control based on the collected incoming line voltage signal and incoming line current signal, and then establishes control optimization objectives and constraints based on the voltage signals of each node, and repeatedly controls until the reactive voltage of the substation is effectively controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a flowchart of a substation control method based on voltage signal analysis. DETAILED DESCRIPTION

[0026] A specific implementation of a substation control method based on voltage signal analysis of the present invention is described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the substation control method of the present invention comprises the following steps:

[0028] Step (1): collecting the incoming line voltage signal and the incoming line current signal of the substation;

[0029] Step (2): Perform preliminary control according to the incoming line voltage signal and the incoming line current signal: determine whether the incoming line voltage signal is within the voltage reference range, if not, control the substation incoming line switch to be disconnected; if so, determine whether the incoming line current signal is within the current reference range, if not, control the substation incoming line switch to be disconnected, if so, keep the substation incoming line switch in working state unchanged;

[0030] Step (3): collecting voltage signals of various nodes of the substation;

[0031] Step (4): Calculate the predicted voltage value of each node;

[0032] Step (5): establishing the substation control optimization target;

[0033] Step (6): establishing the substation control constraint conditions;

[0034] Step (7): collecting reactive voltage of the substation;

[0035] Step (8): Determine the substation control status according to the reactive voltage.

[0036] The specific algorithm for calculating the predicted value of each node voltage is:

[0037] First, retrieve N voltage signal values ​​of each node before and after the same time of the previous day;

[0038] Secondly, the average value of N voltage signal values ​​before and after the same time of each node on the previous day is calculated as the voltage prediction value of each node.

[0039] The substation control optimization goal is to take the voltage prediction value control deviation of the substation voltage signal at time t in the future T time period as the minimum value, specifically: Among them U c is the voltage prediction value, U 0 is the voltage reference value.

[0040] The specific method for establishing the substation control constraint condition is:

[0041] Among them Umin is the lower limit of the voltage signal, U max is the upper limit of the voltage signal, W min is the lower limit of the active output of the reactive power compensator, W max is the upper limit of active output of reactive power compensator, W N It is the initial value of active output of reactive power compensator.

[0042] The specific method for determining the control status of the substation according to the reactive voltage is:

[0043] Determine whether the reactive voltage is within the reactive voltage reference range. If so, maintain the current control state. If not, return to step (3) and continue to collect voltage signals of each node for new control.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. A person skilled in the art should understand that the specific implementation of the present invention can be modified or replaced by equivalents, but these modifications or changes are within the scope of protection of the pending claims.

Claims

1. A substation control method based on voltage signal analysis, characterized in that: The substation control method comprises the following steps: Step (1): collecting the incoming line voltage signal and the incoming line current signal of the substation; Step (2): performing preliminary control according to the incoming line voltage signal and the incoming line current signal; Step (3): collecting voltage signals of various nodes of the substation; Step (4): Calculate the predicted voltage value of each node; Step (5): establishing the substation control optimization target; Step (6): establishing the substation control constraint conditions; Step (7): collecting reactive voltage of the substation; Step (8): Determine the substation control status according to the reactive voltage.

2. A substation control method based on voltage signal analysis according to claim 1, characterized in that: The specific method for performing preliminary control based on the incoming line voltage signal and the incoming line current signal is: determine whether the incoming line voltage signal is within the voltage reference range, if not, control the substation incoming line switch to disconnect; if so, determine whether the incoming line current signal is within the current reference range, if not, control the substation incoming line switch to disconnect, if so, keep the working state of the substation incoming line switch unchanged.

3. A substation control method based on voltage signal analysis according to claim 2, characterized in that: The specific algorithm for calculating the predicted value of each node voltage is: First, retrieve N voltage signal values ​​of each node before and after the same time of the previous day; Secondly, the average value of N voltage signal values ​​before and after the same time of each node on the previous day is calculated as the voltage prediction value of each node. The substation control optimization goal is to take the voltage prediction value control deviation of the substation voltage signal at time t in the future T time period as the minimum value, specifically: Among them U c is the voltage prediction value, and U0 is the voltage reference value.

4. A substation control method based on voltage signal analysis according to claim 3, characterized in that: The specific method for establishing the substation control constraint condition is: Among them U min is the lower limit of the voltage signal, U max is the upper limit of the voltage signal, W min is the lower limit of the active output of the reactive power compensator, W max is the upper limit of active output of reactive power compensator, W N It is the initial value of active output of reactive power compensator.

5. A substation control method based on voltage signal analysis according to claim 4, characterized in that: The specific method for determining the control status of the substation according to the reactive voltage is: judging whether the reactive voltage is within the reactive voltage reference range, if so, maintaining the existing control status, if not, returning to step (3) and continuing to collect voltage signals of each node for new control.

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