CN-122026469-A - Large-range high-efficiency cooperative control method, device, equipment and medium

Abstract

The invention provides a large-range high-efficiency cooperative control and operation method, which comprises the steps of determining that one or more converter units in equipment or a system are operated in a first operation state, acquiring harmonic information of the converter units in the operation state according to operation conditions of the converter units operated in the first operation state, injecting the harmonic information in a control link, determining that the rest converter units in the equipment or the system are operated in a second operation state, calculating the harmonic information corresponding to the converter units in the second operation state according to the harmonic information of the first operation state, and controlling the converter units in the second operation state to perform harmonic compensation on the converter units in the first operation state, so that harmonic waves only flow between the converter units in the first operation state and the second operation state. According to the technical scheme of the embodiment, the large-range high-efficiency operation of the hybrid transformer is realized, and the range and the efficiency of voltage and transmission power are improved.

Inventors

• GUO HUAN
• LI CHEN
• WU HONGYUAN

Assignees

• 暨南大学

Dates

Publication Date

20260512

Application Date

20241105

Claims (10)

1. 1. The utility model provides a high-efficient cooperative control method in a large scale, characterized by that is applied to the equipment or the system that have two or more current converting units to be connected in parallel operation or operate through the transformer coupling on the alternating side, the operating condition of current converting unit in this equipment or the system includes first operating condition and second operating condition, the method includes: Determining that one or more converter units in the equipment or the system operate in a first operating state, wherein the first operating state represents a harmonic injection state; acquiring harmonic information of the converter unit when the converter unit operates according to the operating condition of the converter unit operating in the first operating state, and injecting the harmonic information in a control link to realize a harmonic injection function of the converter unit in the first operating state, wherein the harmonic information comprises a harmonic voltage value and a harmonic current value; Determining that the remaining converter units in the device or system are operated in a second operation state, wherein the second operation state represents a harmonic compensation state; Calculating harmonic information corresponding to the converter unit in the second operation state according to the harmonic information of the first operation state, wherein the harmonic information of the second operation state comprises a harmonic voltage value and a harmonic current value; According to the harmonic information in the second running state, the variable flow unit in the second running state is controlled to perform harmonic compensation on the variable flow unit in the first running state, so that the harmonic only flows between the variable flow units in the first running state and the second running state, and cooperative control and running are realized.
2. 2. The method of claim 1, wherein determining that one or more converter cells of the device or system are operating in the first operating state comprises: acquiring the operation condition of the variable flow unit in the first operation state; And determining a modulation ratio according to the operation condition, calculating a fundamental wave modulation coefficient and a harmonic modulation coefficient according to the modulation ratio, establishing a modulation wave function according to the fundamental wave modulation coefficient and the harmonic modulation coefficient, and modulating the converter unit according to the modulation wave function.
3. 3. The method of claim 1, wherein determining that the remaining converter cells in the device or system are operating in a second operating state comprises: determining harmonic information running in the second running state according to the harmonic information in the first running state; taking the harmonic information in the second running state as control reference information of the converter unit; and carrying out multi-frequency harmonic comprehensive control on the harmonic information in the second running state according to the control reference information so as to realize harmonic compensation of the converter unit.
4. 4. The method of claim 1, wherein the device or system has two or more converter units, the converter units are operated in parallel on the ac side or via transformer coupling, and determining the equivalent model of the device comprises: The alternating current side of the current converting unit is equivalent to be connected in series with an inductor and a resistor, a transformer winding connected with the current converting unit is equivalent to be connected in series with a leakage inductance and a leakage resistance, the inductor and the resistor of the current converting unit in a first operation state and the leakage inductance and the leakage resistance of the transformer winding connected with the current converting unit are equivalent to be calculated to be the first inductor and the first resistor, and the inductor and the resistor of the current converting unit in a second operation state and the leakage inductance and the leakage resistance of the transformer winding connected with the current converting unit are equivalent to be calculated to be the second inductor and the second resistor; And when the number is greater than 1, the second inductance and the second resistance of the current transforming units are equivalently calculated as second integrated inductance and second integrated resistance, and the equipment or the system is externally connected with a network side unit and the network side unit can be equivalently calculated as third integrated inductance and third integrated resistance.
5. 5. The large-scale high-efficiency cooperative control method according to claim 1, wherein the controlling the converter unit in the second operation state to perform harmonic compensation on the converter unit in the first operation state includes: determining alternating current voltage and direct current voltage of the current transformation unit in the first running state, and calculating the voltage range of the current transformation unit according to the alternating current voltage and the direct current voltage; calculating a transmission power range between the variable flow unit operated in the first operation state and the variable flow unit operated in the second operation state according to the harmonic information in the first operation state and the harmonic information in the second operation state; injecting the harmonic information in the first operation state into a converter unit operated in the first operation state to obtain first operation loss; And injecting the harmonic information in the second operation state into a converter unit operated in the second operation state to obtain second operation loss, and calculating the improvement efficiency of the equipment or the system according to the first operation loss and the second operation loss.
6. 6. The method according to claim 1, wherein the controlling of the first operation state converter unit is provided with a voltage compensator and a current compensator, and the harmonic information is injected in the control link to implement a harmonic injection function of the converter unit in the first operation state, including: acquiring a power reference value, an alternating voltage value, a direct voltage reference value and a direct voltage feedback value of the converter unit in the first running state; Calculating a current reference value of the current converting unit in the first running state according to the alternating current voltage value and the power reference value, or inputting the direct current voltage reference value and the direct current voltage feedback value into the voltage compensator to obtain the current reference value of the current converting unit in the first running state; Obtaining a current feedback value of the current converting unit in the first running state, inputting the current feedback value and the current reference value into the current compensator for calculation to obtain a modulation wave reference value of the current converting unit, inputting the modulation wave reference value into the harmonic injection module, and performing harmonic injection on the current converting unit running in the first running state; And after the harmonic wave is injected into the current converting unit in the first running state, obtaining a harmonic voltage value of the current converting unit in the first running state, and inputting the harmonic voltage value into a first formula to obtain a harmonic current value of the current converting unit in the first running state.
7. 7. The large-scale high-efficiency cooperative control method according to claim 1, wherein the current converting unit in the second operation state is provided with a multi-frequency harmonic integrated current compensator, and the controlling the current converting unit in the second operation state to perform harmonic compensation on the current converting unit in the first operation state includes: The method comprises the steps of obtaining an alternating voltage value and a harmonic current value of a current converting unit running in a first running state, and inputting the alternating voltage value and the harmonic current value and the alternating voltage value into a first formula and a second formula to obtain a harmonic current value reference value of the current converting unit running in a second running state; and acquiring a harmonic current feedback value of the current converting unit running in the second running state, inputting the harmonic current reference value and the harmonic current feedback value into the multi-frequency harmonic comprehensive current compensator, and performing harmonic compensation on the current converting unit running in the first running state.
8. 8. A control device for large-scale efficient coordinated control and operation, comprising at least one control processor and a memory for communicative connection with the at least one control processor, the memory storing instructions executable by the at least one control processor to enable the at least one control processor to perform the control method of any one of claims 1 to 7.
9. 9. An electronic device comprising the control apparatus for large-scale high-efficiency cooperative control and operation of claim 8.
10. 10. A computer-readable storage medium storing computer-executable instructions for causing a computer to execute the control method according to any one of claims 1 to 7.

Description

Large-range high-efficiency cooperative control method, device, equipment and medium Technical Field The invention relates to the technical field of energy power systems, in particular to a large-range high-efficiency cooperative control method, a large-range high-efficiency cooperative control device, large-range high-efficiency cooperative control equipment and medium. Background At present, new energy sources such as photovoltaic and the like are increasingly popular to be connected into a power distribution network, and most of the new energy sources are reasonably configured to realize stable tide, so that the influence of the new energy sources on the power grid is reduced, but a current transformation unit for connecting the new energy sources, the energy sources and the power grid in the prior art is limited by alternating current voltage and maximum modulation ratio, and voltage fluctuation such as the energy sources is added, so that the operation range of the current transformation unit is smaller. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a large-range high-efficiency cooperative control and operation method, device and equipment, which are applied to equipment or a system with two or more AC/DC conversion units and with the AC sides connected in parallel or operated through transformer coupling, and can improve the operation range and the efficiency of power transmission. In a first aspect, a large-scale high-efficiency cooperative control method is applied to a device or a system having two or more converter units running in parallel on an ac side or running via transformer coupling, where an operation state of the converter units in the device or the system includes a first operation state and a second operation state, and the method includes: Determining that one or more converter units in the equipment or the system operate in a first operating state, wherein the first operating state represents a harmonic injection state; acquiring harmonic information of the converter unit when the converter unit operates according to the operating condition of the converter unit operating in the first operating state, and injecting the harmonic information in a control link to realize a harmonic injection function of the converter unit in the first operating state, wherein the harmonic information comprises a harmonic voltage value and a harmonic current value; Determining that the remaining converter units in the device or system are operated in a second operation state, wherein the second operation state represents a harmonic compensation state; Calculating harmonic information corresponding to the converter unit in the second operation state according to the harmonic information of the first operation state, wherein the harmonic information of the second operation state comprises a harmonic voltage value and a harmonic current value; According to the harmonic information in the second running state, the variable flow unit in the second running state is controlled to perform harmonic compensation on the variable flow unit in the first running state, so that the harmonic only flows between the variable flow units in the first running state and the second running state, and cooperative control and running are realized. In some embodiments of the present invention, the determining that one or more converter units in the device or the system operate in the first operation state includes: acquiring the operation condition of the variable flow unit in the first operation state; And determining a modulation ratio according to the operation condition, calculating a fundamental wave modulation coefficient and a harmonic modulation coefficient according to the modulation ratio, establishing a modulation wave function according to the fundamental wave modulation coefficient and the harmonic modulation coefficient, and modulating the converter unit according to the modulation wave function. In some embodiments of the present invention, the determining that the remaining converter units in the device or system operate in the second operation state includes: determining harmonic information running in the second running state according to the harmonic information in the first running state; taking the harmonic information in the second running state as control reference information of the converter unit; and carrying out multi-frequency harmonic comprehensive control on the harmonic information in the second running state according to the control reference information so as to realize harmonic compensation of the converter unit. In some embodiments of the invention, the device or system has two or more current transforming units operating in parallel on the ac side or via transformer coupling, determining an equivalent model of the device, comprising: The alternating current side of the current conve