A multi-channel electric energy collection control method based on power grid strength

Abstract

The present invention provides a multi-channel electric energy collection work control method based on the strength of the power grid, comprising: (1): collecting information; (2): judging whether there is an abnormality based on the output work information, if yes, alarm and enter (3); if no, enter (4); (3): cutting off the branch corresponding to the abnormality and enter (4); (4): calculating the AC intensity of each channel of electric energy entering the node; (5): calculating the node AC intensity; (6): judging whether there is an abnormality based on the node AC intensity, if yes, enter (7); if no, enter (8); (7): sorting the AC intensity of each channel of electric energy entering the node, controlling the lowest branch to be disconnected, and returning to (1); (8): judging whether to continue, if yes, return to (1); if no, end. The present invention provides a multi-channel electric energy collection work control method based on the strength of the power grid, which can effectively control each branch according to the AC intensity of each channel of electric energy entering the node.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy detection and control, and in particular relates to a multi-channel electric energy collection control method based on power grid strength. Background Art

[0002] my country's renewable energy power generation has entered a period of rapid development. A large number of distributed power sources are connected to the power system through converters, which not only has problems such as randomness and volatility, but also leads to a decrease in the stability of the power grid and the quality of power supply. Therefore, it is necessary to effectively detect and control the distributed power sources connected to the power grid to ensure that they can safely and reliably output power to the power grid, thereby ensuring the stability of the entire power grid.

[0003] The present invention proposes a multi-channel electric energy collection work control method based on the power grid strength, collects the working information of each channel of electric energy output, and judges the abnormality of the power generation system of each branch according to the output current, equivalent impedance and electric energy loss of each channel, calculates the node AC strength, and then judges whether there is any abnormality in the node access power, and controls each branch according to the AC strength of each channel of electric energy entering the node, so as to effectively ensure that the power generation system of each branch enters the node safely and reliably. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a multi-channel electric energy collection control method based on power grid strength, which can control each branch according to the AC strength of each electric energy collection node, and effectively ensure that the power generation system of each branch is safely and reliably collected at the node.

[0005] The present invention is specifically a multi-channel electric energy collection work control method based on power grid strength, and the multi-channel electric energy collection work control method comprises the following steps:

[0006] Step (1): Collecting the working information of each power output, including output current, output voltage, input node current, and input node voltage;

[0007] Step (2): judging whether each channel of electric energy has an abnormality according to the output working information of each channel of electric energy, if so, issuing a corresponding alarm and proceeding to step (3); if not, proceeding to step (4);

[0008] Step (3): Cut off the branch corresponding to the abnormal electric energy and proceed to step (4);

[0009] Step (4): Calculate the AC intensity input value of each power input node;

[0010] Step (5): Calculate the node communication intensity;

[0011] Step (6): judging whether there is an abnormality in the power access of the node according to the node AC strength, if so, proceeding to step (7); if not, proceeding to step (8);

[0012] Step (7): sort the AC intensities of the various electric energies entering the node, control the branch with the lowest AC intensity to be disconnected, and return to step (1);

[0013] Step (8): Determine whether to continue to judge the control. If so, return to step (1); if not, end.

[0014] Furthermore, in step (2), the specific method for judging whether each channel of electric energy has an abnormality according to the output working information of each channel of electric energy is:

[0015] (21) Determine whether the output current of each branch of electric energy is within the output current reference range. If not, the corresponding branch electric energy is abnormal, and go to step (3); if so, go to step (22);

[0016] (22) Calculate the equivalent impedance of each power output;

[0017] (23) determining whether the equivalent impedance is greater than the equivalent impedance reference value; if so, the corresponding branch circuit power is abnormal, and proceeding to step (3); if not, proceeding to step (24);

[0018] (24) Calculate the power loss of each circuit;

[0019] (25) Determine whether the power loss of each branch is greater than the power loss reference value. If so, there is an abnormality in the power of the corresponding branch, and go to step (3); if not, go to step (4).

[0020] Furthermore, the specific algorithm for calculating the equivalent impedance of each power output in step (22) is:

[0021]

[0022] Wherein U2 is the sink node voltage, and I2 is the sink node current.

[0023] Furthermore, the specific algorithm for calculating the power loss of each circuit in step (24) is:

[0024]

[0025] Wherein U1 is the output voltage, I1 is the output current, and θ is the phase angle difference between the output voltage and the sink node voltage.

[0026] Furthermore, the specific algorithm for calculating the AC intensity of each power source entering the node in step (4) is:

[0027]

[0028] Where Z i is the power output equivalent impedance of branch i, P i is the rated power of branch i, and N is the number of branches.

[0029] Furthermore, the specific algorithm for calculating the node communication strength in step (5) is:

[0030]

[0031] Furthermore, in step (6), the specific method for judging whether there is an abnormality in the power access of the node according to the node AC strength is:

[0032] It is determined whether the node AC intensity is greater than a node AC intensity reference value. If so, there is an abnormality in the access power node.

[0033] Compared with the prior art, the beneficial effects are: the multi-channel electric energy collection control method collects data including output current, output voltage, incoming node current, and incoming node voltage, and makes abnormal judgments on the power generation system of each branch according to the output current, equivalent impedance, and electric energy loss of each channel, thereby improving the reliability of the power generation system of each branch itself; in addition, the node AC strength is calculated to determine whether there is any abnormality in the node access power, and each branch is controlled according to the AC strength of each channel of electric energy entering the node, thereby effectively ensuring that the power generation system of each branch enters the node safely and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a flowchart of a multi-channel electric energy collection control method based on power grid strength. DETAILED DESCRIPTION

[0035] The specific implementation method of a multi-channel electric energy collection control method based on power grid strength of the present invention is described in detail below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the multi-channel electric energy collection control method of the present invention includes the following steps:

[0037] Step (1): Collecting the working information of each power output, including output current, output voltage, input node current, and input node voltage;

[0038] Step (2): judging whether each channel of electric energy has an abnormality according to the output working information of each channel of electric energy, if so, issuing a corresponding alarm and proceeding to step (3); if not, proceeding to step (4);

[0039] Step (3): Cut off the branch corresponding to the abnormal electric energy and proceed to step (4);

[0040] Step (4): Calculate the AC intensity input value of each power input node;

[0041] Step (5): Calculate the node communication intensity;

[0042] Step (6): judging whether there is an abnormality in the power access of the node according to the node AC strength, if so, proceeding to step (7); if not, proceeding to step (8);

[0043] Step (7): sort the AC intensities of the various electric energies entering the node, control the branch with the lowest AC intensity to be disconnected, and return to step (1);

[0044] Step (8): Determine whether to continue to judge the control. If so, return to step (1); if not, end.

[0045] The specific method for judging whether each channel of electric energy has an abnormality according to the output working information of each channel of electric energy in step (2) is:

[0046] (21) Determine whether the output current of each branch of electric energy is within the output current reference range. If not, the corresponding branch electric energy is abnormal, and go to step (3); if so, go to step (22);

[0047] The reference range of each output current is determined according to the actual conditions of each power generation system:

[0048] In case of photovoltaic power generation, the current reference range is determined according to the light intensity;

[0049] In case of wind power generation, the current reference range is determined according to the wind speed and wind direction.

[0050] (22) Calculate the equivalent impedance of each power output;

[0051]

[0052] Wherein U2 is the sink node voltage, and I2 is the sink node current;

[0053] (23) determining whether the equivalent impedance is greater than the equivalent impedance reference value; if so, the corresponding branch circuit power is abnormal, and proceeding to step (3); if not, proceeding to step (24);

[0054] (24) Calculate the power loss of each circuit;

[0055]

[0056] Wherein U1 is the output voltage, I1 is the output current, and θ is the phase angle difference between the output voltage and the sink node voltage;

[0057] (25) Determine whether the power loss of each branch is greater than the power loss reference value. If so, there is an abnormality in the power of the corresponding branch, and go to step (3); if not, go to step (4).

[0058] The specific algorithm for calculating the AC intensity of each power source entering the node in step (4) is:

[0059]

[0060] Where Z i is the power output equivalent impedance of branch i, P i is the rated power of branch i, and N is the number of branches.

[0061] The specific algorithm for calculating the node communication strength in step (5) is:

[0062]

[0063] The specific method for judging whether there is an abnormality in the power access of the node according to the node AC strength in step (6) is:

[0064] It is determined whether the node AC intensity is greater than a node AC intensity reference value. If so, there is an abnormality in the access power node.

[0065] The present invention also proposes a multi-channel electric energy collection control system based on the strength of the power grid, including a signal acquisition module, a control processing module, and a communication module.

[0066] The signal acquisition module collects the working information of each power output, including output current, output voltage, input node current, input node voltage, and transmits it to the control processing module;

[0067] The control processing module controls and processes the collected information and transmits the control information to each branch through the communication module. Specifically:

[0068] S1: Determine whether there is an abnormality in each channel of power according to the output working information of each channel of power. If so, issue a corresponding alarm and enter S2; if not, enter S3;

[0069] S2: Cut off the branch corresponding to the abnormal electric energy and enter S3;

[0070] S3: Calculate the AC intensity input value of each power input node;

[0071] S4: Calculate the node communication intensity;

[0072] S5: judging whether there is an abnormality in the power access of the node according to the node AC strength, if so, proceeding to S6; if not, proceeding to S7;

[0073] S6: Sort the AC intensities of the electric energies flowing into the node, disconnect the branch with the lowest AC intensity, and return to S1;

[0074] S7: Determine whether to continue the control. If yes, return to step (1); if no, end.

[0075] 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 multi-channel electric energy collection control method based on power grid strength, characterized in that: The multi-channel electric energy collection control method comprises the following steps: Step (1): Collecting the working information of each power output, including output current, output voltage, input node current, and input node voltage; Step (2): judging whether each channel of electric energy has an abnormality according to the output working information of each channel of electric energy, if so, issuing a corresponding alarm and proceeding to step (3); if not, proceeding to step (4); Step (3): Cut off the branch corresponding to the abnormal electric energy and proceed to step (4); Step (4): Calculate the AC intensity input value of each power input node; Step (5): Calculate the node communication intensity; Step (6): judging whether there is an abnormality in the power access of the node according to the node AC strength, if so, proceeding to step (7); if not, proceeding to step (8); Step (7): sort the AC intensities of the various electric energies entering the node, control the branch with the lowest AC intensity to be disconnected, and return to step (1); Step (8): Determine whether to continue to judge the control. If so, return to step (1); if not, end.

2. A multi-channel electric energy collection control method based on power grid strength according to claim 1, characterized in that: The specific method for judging whether each channel of electric energy has an abnormality according to the output working information of each channel of electric energy in step (2) is: (21) Determine whether the output current of each branch of electric energy is within the output current reference range. If not, the corresponding branch electric energy is abnormal, and go to step (3); if so, go to step (22); (22) Calculate the equivalent impedance of each power output; (23) determining whether the equivalent impedance is greater than the equivalent impedance reference value; if so, the corresponding branch circuit power is abnormal, and proceeding to step (3); if not, proceeding to step (24); (24) Calculate the power loss of each circuit; (25) Determine whether the power loss of each branch is greater than the power loss reference value. If so, there is an abnormality in the power of the corresponding branch, and go to step (3); if not, go to step (4).

3. A multi-channel electric energy collection control method based on power grid strength according to claim 2, characterized in that: The specific algorithm for calculating the equivalent impedance of each power output in step (22) is: Wherein U2 is the sink node voltage, and I2 is the sink node current.

4. A multi-channel electric energy collection control method based on power grid strength according to claim 3, characterized in that: The specific algorithm for calculating the power loss of each circuit in step (24) is: Wherein U1 is the output voltage, I1 is the output current, and θ is the phase angle difference between the output voltage and the sink node voltage.

5. A multi-channel electric energy collection control method based on power grid strength according to claim 4, characterized in that: The specific algorithm for calculating the AC intensity of each power source entering the node in step (4) is: Where Z i is the power output equivalent impedance of branch i, P i is the rated power of branch i, and N is the number of branches.

6. A multi-channel electric energy collection control method based on power grid strength according to claim 5, characterized in that: The specific algorithm for calculating the node communication strength in step (5) is:

7. A multi-channel electric energy collection control method based on power grid strength according to claim 6, characterized in that: The specific method for judging whether there is an abnormality in the node access to electric energy according to the node AC strength in step (6) is: judging whether the node AC strength is greater than the node AC strength reference value; if so, there is an abnormality in the access to electric energy node.

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