Method for implementing fast power response and new energy power plant
View Patent ↗This application discloses a method for implementing a fast power response and a power plant. The method is applied to a power plant-end power control apparatus, and includes determining a whole-plant reactive power target value and/or a whole-plant active power target value of the power plant. The method also includes determining, based on the whole-plant reactive power target value and/or the whole-plant active power target value, a second power control instruction readable to each photovoltaic inverter or power conversion system in the power plant. The method further includes delivering, through a subarray controller or a subarray communication device over an Ethernet network and/or a field bus network, the second power control instruction to each photovoltaic inverter or power conversion system indicated by address identifier information carried in the second power control instruction, so that each photovoltaic inverter or power conversion system makes a fast power response based on the second power control instruction.
1 . A method for implementing a power response, applied to a power plant power control apparatus in a energy power plant, wherein the power plant comprises at least two subarrays, each of the subarrays comprising a power control instruction processing and forwarding apparatus and at least three power control instruction execution apparatuses, wherein the method comprises:
determining a whole-plant reactive power target value of the power plant based on an acquired voltage analog signal of a grid-tied point of the power plant at a current moment, wherein the determining the whole-plant reactive power target value of the power plant comprises:
acquiring the voltage analog signal of the grid-tied point of the power plant at the current moment;
processing the voltage analog signal of the grid-tied point at the current moment based on an instantaneous voltage amplitude calculation algorithm that is an αβ transformation method for constructing a two-phase voltage, to determine an instantaneous voltage amplitude of the grid-tied point at the current moment; and
determining the whole-plant reactive power target value of the power plant based on the instantaneous voltage amplitude of the grid-tied point at the current moment;
determining, based on the whole-plant reactive power target value, a second power control instruction readable by each power control instruction execution apparatus in each subarray in the power plant, wherein the second power control instruction indicates a power target value of each power control instruction execution apparatus existing when the whole-plant reactive power target value is reached; and
transmitting the second power control instruction to each power control instruction execution apparatus through the respective power control instruction processing and forwarding apparatus in each subarray in the power plant, so that each power control instruction execution apparatus makes a power response based on the second power control instruction.
2 . The method according to claim 1 , wherein:
the power target value of each power control instruction execution apparatus is a power target absolute value, a power target percentage value, a variation absolute value, or a variation percentage value,
the power target percentage value is a percentage value between the power target absolute value and rated power of the power control instruction execution apparatus,
the variation absolute value is an absolute difference between the power target absolute value and power of the power control instruction execution apparatus at the current moment, and
the variation percentage value is a percentage value between the variation absolute value and the rated power of the power control instruction execution apparatus.
3 . The method according to claim 1 , wherein the second power control instruction carries address identifier information of each power control instruction execution apparatus, and the address identifier information comprises at least one of an internet protocol (IP) address, a unicast media access control (MAC) address, or a multicast or broadcast MAC address.
4 . The method according to claim 1 , wherein transmitting the second power control instruction to each power control instruction execution apparatus through the respective power control instruction processing and forwarding apparatus in each subarray in the power plant comprises:
delivering the second power control instruction to the respective power control instruction processing and forwarding apparatus in each subarray in the power plant, so that the power control instruction processing and forwarding apparatus directly delivers the second power control instruction to a target power control instruction execution apparatus in the subarray corresponding to the power control instruction processing and forwarding apparatus, wherein the target power control instruction execution apparatus is a power control instruction execution apparatus indicated by address identifier information carried in the second power control instruction.
5 . The method according to claim 1 , wherein:
the power control instruction processing and forwarding apparatus comprises a subarray controller or a subarray communication device;
the subarray controller is a device that is installed in the subarray and that matches a step-up transformer in the subarray, and the subarray controller is any one or more of a subarray data acquisition apparatus, an all-in-one smart box-type transformer measurement and control apparatus, a communication management apparatus, or a protocol conversion apparatus;
the subarray communication device is any one or more of a network switch, a gateway machine, an optical fiber repeater, a bus repeater, or a bus extension apparatus; and
the power control instruction execution apparatus comprises a photovoltaic inverter or a power conversion system.
6 . The method according to claim 1 , wherein at least one of Ethernet network communication or field bus network communication is performed between the power plant power control apparatus and each power control instruction execution apparatus;
the Ethernet network communication is any one of generic object oriented substation event GOOSE communication or user datagram protocol (UDP) communication; and
the field bus network communication is any one of controller area network (CAN) communication, Ethernet for control automation technology (EtherCAT) communication, or open source real-time communication technology Ethernet Powerlink communication.
7 . The method according to claim 1 , wherein before determining the whole-plant reactive power target value of the power plant, the method further comprises:
determining a frequency value based on the instantaneous voltage amplitude;
determining at least one of whole-plant reactive power or whole-plant active power of the power plant at the current moment based on the instantaneous voltage amplitude of the grid-tied point at the current moment and the frequency value; and
determining whether at least one of the whole-plant reactive power or the whole-plant active power of the power plant at the current moment falls outside a preset interval.
8 . The method according to claim 1 , wherein the instantaneous voltage amplitude is further determined based on both a semi-cycle Fourier calculation algorithm and a full-cycle Fourier calculation algorithm.
9 . The method according to claim 1 , wherein the voltage analog signal is acquired by using a potential transformer.
10 . The method according to claim 1 , wherein a sampling frequency for acquiring the voltage analog signal is greater than or equal to 1200 HZ.
11 . A energy power plant, comprising:
a power plant power control apparatus and at least two subarrays, wherein each of the subarrays comprises a power control instruction processing and forwarding apparatus and at least three power control instruction execution apparatuses, wherein:
the power plant power control apparatus is configured to determine a whole-plant reactive power target value of the power plant based on of an acquired voltage analog signal of a grid-tied point of the power plant at a current moment, wherein the power plant power control apparatus is configured to:
acquire the voltage analog signal of the grid-tied point of the power plant at the current moment;
process the voltage analog signal of the grid-tied point at the current moment based on an instantaneous voltage amplitude calculation algorithm that is an αβ transformation method for constructing a two-phase voltage, to determine an instantaneous voltage amplitude of the grid-tied point at the current moment; and
determine the whole-plant reactive power target value of the power plant based on the instantaneous voltage amplitude of the grid-tied point at the current moment;
the power plant power control apparatus is further configured to: determine, based on the whole-plant reactive power target value, a second power control instruction readable by each power control instruction execution apparatus in each subarray in the power plant, and deliver the second power control instruction to the respective power control instruction processing and forwarding apparatus in each subarray in the power plant, wherein the second power control instruction indicates a power target value of each power control instruction execution apparatus existing when the whole-plant reactive power target value is reached;
the respective power control instruction processing and forwarding apparatus in each subarray in the power plant is configured to transmit the second power control instruction to each power control instruction execution apparatus; and
each power control instruction execution apparatus is configured to make a power response based on the second power control instruction.
12 . The power plant according to claim 11 , wherein:
the power target value of each power control instruction execution apparatus is a power target absolute value, a power target percentage value, a variation absolute value, or a variation percentage value,
the power target percentage value is a percentage value between the power target absolute value and rated power of the power control instruction execution apparatus,
the variation absolute value is an absolute difference between the power target absolute value and power of the power control instruction execution apparatus at the current moment, and
the variation percentage value is a percentage value between the variation absolute value and the rated power of the power control instruction execution apparatus.
13 . The power plant according to claim 11 , wherein the second power control instruction carries address identifier information of each power control instruction execution apparatus, and the address identifier information comprises at least one of an internet protocol (IP) address, a unicast media access control (MAC) address, or a multicast or broadcast MAC address.
14 . The power plant according to claim 11 , wherein when transmitting the second power control instruction to each power control instruction execution apparatus, the respective power control instruction processing and forwarding apparatus in each subarray in the power plant is configured to:
deliver the second power control instruction to a target power control instruction execution apparatus in the subarray corresponding to the power control instruction processing and forwarding apparatus, wherein the target power control instruction execution apparatus is a power control instruction execution apparatus indicated by address identifier information carried in the second power control instruction.
15 . The power plant according to claim 11 , wherein:
the power control instruction processing and forwarding apparatus comprises a subarray controller or a subarray communication device;
the subarray controller is a device that is installed in the subarray and that matches a step-up transformer in the subarray, and the subarray controller is any one or more of a subarray data acquisition apparatus, an all-in-one smart box-type transformer measurement and control apparatus, a communication management apparatus, or a protocol conversion apparatus;
the subarray communication device is any one or more of a network switch, a gateway machine, an optical fiber repeater, a bus repeater, or a bus extension apparatus; and
the power control instruction execution apparatus comprises a photovoltaic inverter or a power conversion system.
16 . The power plant according to claim 11 is operable such that at least one of Ethernet network communication or field bus network communication is performed between the power plant power control apparatus and each power control instruction execution apparatus; wherein:
the Ethernet network communication is any one of generic object oriented substation event GOOSE communication or user datagram protocol (UDP) communication; and
the field bus network communication is any one of controller area network (CAN) communication, Ethernet for control automation technology (EtherCAT) communication, or open source real-time communication technology Ethernet Powerlink communication.
17 . The power plant according to claim 11 , wherein the power plant power control apparatus is further configured to:
determine a frequency value based on the instantaneous voltage amplitude;
determine at least one of whole-plant reactive power or whole-plant active power of the power plant at the current moment based on the instantaneous voltage amplitude of the grid-tied point at the current moment and the frequency value; and
determine whether at least one of the whole-plant reactive power or the whole-plant active power of the power plant at the current moment falls outside a preset interval.
18 . The power plant according to claim 11 , wherein the instantaneous voltage amplitude is further determined based on both a semi-cycle Fourier calculation algorithm and a full-cycle Fourier calculation algorithm.
19 . A power plant power control apparatus, comprising:
one or more memories configured to store instructions; and
one or more processors coupled to the one or more memories and configured to execute the instructions to cause the power plant power control apparatus to:
determine a whole-plant reactive power target value of an energy power plant based on an acquired voltage analog signal of a grid-tied point of the power plant at a current moment, wherein the determining the whole-plant reactive power target value of the power plant comprises:
acquiring the voltage analog signal of the grid-tied point of the power plant at the current moment;
processing the voltage analog signal of the grid-tied point at the current moment based on an instantaneous voltage amplitude calculation algorithm that is an αβ transformation method for constructing a two-phase voltage, to determine an instantaneous voltage amplitude of the grid-tied point at the current moment; and
determining the whole-plant reactive power target value of the power plant based on the instantaneous voltage amplitude of the grid-tied point at the current moment;
determine, based on the whole-plant reactive power target value, a second power control instruction; and
transmit the second power control instruction.
20 . The power plant power control apparatus according to claim 19 , wherein the instantaneous voltage amplitude is further determined based on both a semi-cycle Fourier calculation algorithm and a full-cycle Fourier calculation algorithm.