Coordination control method and system for flexible interconnection device

Abstract

The invention provides a coordination control method and system for a flexible interconnection device, and the method comprises the steps: configuring an active demand of the flexible interconnection device based on a received scheduling instruction according to a matching principle of power factors at two sides of a subsystem, and obtaining active demand configuration information; according to the number of subsystems in the flexible interconnection device and the active demand configuration information, in combination with reactive demand conditions of two sides of each subsystem for satisfying the reactive demand, configuring the reactive demand of the flexible interconnection device according to a preset reactive distribution rule, and obtaining reactive demand configuration information; dividing the scheduling instruction into an active instruction and a reactive instruction according to the active demand configuration information and the reactive demand configuration information; and controlling the subsystems meeting the active power demand according to the active power instruction, and controlling the subsystems meeting the reactive power demand according to the reactive power instruction. According to the invention, through carrying out coordination control on the subsystems in the flexible interconnection device, common-mode voltage and circulation components do not need to be injected, so that the control complexity is reduced and the efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission, and particularly relates to a coordinated control method and system for a flexible interconnection device. Background Art

[0002] In an interconnected power grid mainly composed of an AC power grid, with the increase in the scale of the power grid and the increasing complexity of AC-DC coupling, problems such as excessive short-circuit current, risk of cascading failures, and problems of electromagnetic loop networks across voltage levels are prominent. The power support between regions leads to limited power supply capacity.

[0003] The flexible interconnection device based on the modular multilevel matrix converter (M3C) can effectively solve the above problems such as excessive short-circuit current and inflexible power mutual assistance, realize fault isolation and short-circuit current control, and at the same time has the advantages of low cost and small floor area. However, M3C usually works in a scenario where the frequencies on both sides are different. In a scenario where the frequencies on both sides are close, low-frequency ripple pulsations are generated, and additional common-mode voltage and circulating current components need to be injected, resulting in complex control and low efficiency. Summary of the Invention

[0004] In order to overcome the above defects of complex control and low efficiency, the present invention provides a coordinated control method for a flexible interconnection device, including:

[0005] Based on the received scheduling instruction, according to the principle of power factor matching on both sides of the subsystem, configure the active power demand of the flexible interconnection device to obtain the active power demand configuration information;

[0006] According to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combined with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, configure the reactive power demand of the flexible interconnection device according to a preset reactive power distribution rule to obtain the reactive power demand configuration information;

[0007] According to the active power demand configuration information and the reactive power demand configuration information, divide the scheduling instruction into an active power instruction and a reactive power instruction;

[0008] Control the subsystems that meet the active power demand according to the active power instruction, and control the subsystems that meet the reactive power demand according to the reactive power instruction to complete the coordinated control of the subsystems in the flexible interconnection device.

[0009] Optionally, the active power demand configuration information includes the number of subsystems that meet the active power demand;

[0010] The configuring the active power demand of the flexible interconnection device based on the received scheduling instruction and according to the principle of power factor matching on both sides of the subsystem to obtain the active power demand configuration information includes:

[0011] Based on the received scheduling instruction, according to the principle of power factor matching on both sides of the subsystem, the active power distribution formula is used to determine the number of subsystems that meet the active power demand.

[0012] Optionally, the active power distribution formula satisfies the following formula:

[0013] where a is the number of subsystems that meet the active power demand, round is the function for rounding, P ref is the scheduling instruction, and S N is the capacity of the subsystem.

[0014] Optionally, the configuration of the reactive power demand of the flexible interconnection device according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combined with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, according to the preset reactive power distribution rule, to obtain the reactive power demand configuration information includes:

[0015] If the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand are the same for each subsystem, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, according to the principle of equal reactive power sharing, reactive power is allocated to each subsystem for meeting the reactive power demand, to obtain the reactive power demand configuration information.

[0016] Optionally, the configuration of the reactive power demand of the flexible interconnection device according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combined with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, according to the preset reactive power distribution rule, to obtain the reactive power demand configuration information includes:

[0017] If the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand are different for each subsystem, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, each subsystem for meeting the reactive power demand is divided into two groups of subsystems;

[0018] According to the principle of subsystem margin configuration, equal reactive power sharing is performed on one group of subsystems in the two groups of subsystems, and surplus reactive power distribution is performed on the other group of subsystems, to obtain the reactive power demand configuration information.

[0019] Optionally, the process of equal reactive power sharing on one group of subsystems in the two groups of subsystems according to the principle of subsystem margin configuration satisfies the following formula:

[0020] where Q ref1 is the reactive power reference value of the subsystem, S N is the capacity of the subsystem, and P ref1It is the reactive power command of the subsystem.

[0021] Optionally, the process of performing surplus reactive power distribution on another group of subsystems satisfies the following formula:

[0022] Q b = Q1 - Q2; where Q b is the surplus reactive power of the subsystem, Q1 and Q2 are the reactive power demands on both sides of the subsystem respectively, and Q1 and Q2 are not equal.

[0023] Optionally, the control of the subsystem that meets the reactive power demand according to the reactive power command includes:

[0024] According to the reactive power command, a control strategy switching and / or a unilateral converter valve controller blocking are adopted to control the subsystem that meets the reactive power demand.

[0025] Optionally, the coordinated control of the subsystems in the flexible interconnection device is completed by controlling the subsystem that meets the active power demand according to the active power command and controlling the subsystem that meets the reactive power demand according to the reactive power command, including:

[0026] Using the subsystem coordinated controller in the flexible interconnection device, the active power command and the reactive power command are respectively sent to the subsystem that meets the active power demand and the subsystem that meets the reactive power demand;

[0027] Using the subsystem that meets the active power demand and the subsystem that meets the reactive power demand to send the active power command and the reactive power command to the system-level controller of the flexible interconnection device;

[0028] Using the system-level controller to generate a station-level control reference value command according to the active power command and the reactive power command;

[0029] Using the station-level controller of the flexible interconnection device to generate a valve-level control command according to the station-level control reference value command and send it to the converter valves in each subsystem to complete the coordinated control of the subsystems in the flexible interconnection device.

[0030] On the other hand, the present invention also provides a coordinated control system for a flexible interconnection device, including:

[0031] An active power demand configuration module, configured to configure the active power demand of the flexible interconnection device according to the power factor matching principle on both sides of the subsystem based on the received scheduling instruction, so as to obtain active power demand configuration information;

[0032] A reactive power demand configuration module, which is used to configure the reactive power demand of the flexible interconnection device according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combine the reactive power demand situations on both sides of each subsystem for meeting the reactive power demand, and obtain the reactive power demand configuration information according to a preset reactive power distribution rule;

[0033] A scheduling instruction division module, which is used to divide the scheduling instruction into an active power instruction and a reactive power instruction according to the active power demand configuration information and the reactive power demand configuration information;

[0034] A coordination control module, which is used to control the subsystems that meet the active power demand according to the active power instruction, and control the subsystems that meet the reactive power demand according to the reactive power instruction, so as to complete the coordinated control of the subsystems in the flexible interconnection device.

[0035] Optionally, the active power demand configuration information includes the number of subsystems that meet the active power demand;

[0036] The active power demand configuration module is specifically used for:

[0037] Based on the received scheduling instruction, according to the principle of power factor matching on both sides of the subsystem, and using the active power distribution formula, determine the number of subsystems that meet the active power demand.

[0038] Optionally, the active power distribution formula satisfies the following formula:

[0039] where a is the number of subsystems that meet the active power demand, round is a function for rounding, P ref is the scheduling instruction, and S N is the capacity of the subsystem.

[0040] Optionally, the reactive power demand configuration module is specifically used for:

[0041] If the reactive power demand situations on both sides of each subsystem for meeting the reactive power demand are the same for both sides of each subsystem, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, distribute the reactive power to each subsystem for meeting the reactive power demand according to the principle of equal reactive power sharing, and obtain the reactive power demand configuration information.

[0042] Optionally, the reactive power demand configuration module is specifically used for:

[0043] If the reactive power demand situations on both sides of each subsystem for meeting the reactive power demand are different for both sides of each subsystem, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, divide each subsystem for meeting the reactive power demand into two groups of subsystems;

[0044] According to the principle of subsystem margin configuration, reactive power equalization is performed on one group of subsystems among the two groups of subsystems, and surplus reactive power distribution is performed on the other group of subsystems to obtain reactive power demand configuration information.

[0045] Optionally, the reactive power demand configuration module is specifically configured to perform reactive power equalization on one group of subsystems among the two groups of subsystems according to the principle of subsystem margin configuration, and the process satisfies the following formula:

[0046] where Q ref1 is the reactive power reference value of the subsystem, S N is the capacity of the subsystem, and P ref1 is the reactive power command of the subsystem.

[0047] Optionally, the reactive power demand configuration module is specifically configured to perform surplus reactive power distribution on the other group of subsystems, and the process satisfies the following formula:

[0048] Q b = Q1 - Q2; where Q b is the surplus reactive power of the subsystem, Q1 and Q2 are the reactive power demands on both sides of the subsystem respectively, and Q1 and Q2 are not equal.

[0049] Optionally, the coordinated control module is specifically configured to:

[0050] According to the reactive power command, adopt control strategy switching and / or unilateral converter valve controller locking to control the subsystem that meets the reactive power demand.

[0051] Optionally, the coordinated control module is specifically configured to:

[0052] Use the subsystem coordination controller in the flexible interconnection device to send the active power command and the reactive power command to the subsystem that meets the active power demand and the subsystem that meets the reactive power demand respectively;

[0053] Use the subsystem that meets the active power demand and the subsystem that meets the reactive power demand to send the active power command and the reactive power command to the system-level controller of the flexible interconnection device;

[0054] Use the system-level controller to generate a station-level control reference value command according to the active power command and the reactive power command;

[0055] Use the station-level controller of the flexible interconnection device to generate a valve-level control command according to the station-level control reference value command and send it to the converter valve in each subsystem to complete the coordinated control of the subsystems in the flexible interconnection device.

[0056] On the other hand, the present invention also provides a computer device, characterized in that it includes: one or more processors;

[0057] The processor is used to store one or more programs;

[0058] When the one or more programs are executed by the one or more processors, the coordinated control method of the flexible interconnection device described in any one of the above is implemented.

[0059] On the other hand, the present invention also provides a computer-readable storage medium, characterized in that a computer program is stored thereon, and when the computer program is executed, the coordinated control method of the flexible interconnection device described in any one of the above is implemented.

[0060] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0061] The present invention provides a coordinated control method and system for a flexible interconnection device. The method includes: based on the received scheduling instruction, configuring the active power demand of the flexible interconnection device according to the principle of power factor matching on both sides of the subsystem to obtain the active power demand configuration information; according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, and combining the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, configuring the reactive power demand of the flexible interconnection device according to the preset reactive power distribution rule to obtain the reactive power demand configuration information; dividing the scheduling instruction into an active power instruction and a reactive power instruction according to the active power demand configuration information and the reactive power demand configuration information; controlling the subsystems that meet the active power demand according to the active power instruction, and controlling the subsystems that meet the reactive power demand according to the reactive power instruction to complete the coordinated control of the subsystems in the flexible interconnection device. In the present invention, by coordinating the control of the subsystems in the flexible interconnection device, there is no need to inject common-mode voltage and circulating current components, thereby reducing the control complexity and improving the efficiency, and the problems of large low-frequency pulsation of the bridge arm and low system efficiency can be actively eliminated, enabling the flexible interconnection device to operate reliably and providing sufficient active and reactive power support for the bilateral power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic flow chart of the coordinated control method of the flexible interconnection device of the present invention;

[0063] Figure 2 It is a schematic topology diagram of the flexible interconnection device of the present invention;

[0064] Figure 3 It is a schematic diagram of the changed structure of the power grid system of the present invention;

[0065] Figure 4 It is a schematic structure diagram of the coordinated control system of the flexible interconnection device of the present invention;

[0066] Figure 5 Schematic structural diagram of the electronic device of the present invention. Detailed implementation manners

[0067] The following further elaborates in detail on the specific implementation manners of the present invention with reference to the accompanying drawings.

[0068] Embodiment 1:

[0069] Schematic flowchart of a coordinated control method for a flexible interconnection device provided by the present invention, as Figure 1 shown, includes:

[0070] Step 101: Based on the received scheduling instruction, configure the active power demand of the flexible interconnection device according to the principle of power factor matching on both sides of the subsystem, and obtain the active power demand configuration information.

[0071] Step 102: According to the number of subsystems in the flexible interconnection device and the active power demand configuration information, and in combination with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, configure the reactive power demand of the flexible interconnection device according to the preset reactive power distribution rule, and obtain the reactive power demand configuration information.

[0072] Step 103: Divide the scheduling instruction into an active power instruction and a reactive power instruction according to the active power demand configuration information and the reactive power demand configuration information.

[0073] Step 104: Control the subsystems that meet the active power demand according to the active power instruction, and control the subsystems that meet the reactive power demand according to the reactive power instruction, and complete the coordinated control of the subsystems in the flexible interconnection device.

[0074] Currently, M3C usually operates in a scenario where the frequencies on both sides are different. In a scenario where the frequencies on both sides are close, low-frequency ripple pulsations are generated, and additional common-mode voltage and circulating current components need to be injected, resulting in complex control and low efficiency. And the interconnection device is usually above gigawatts and consists of multiple groups of valves. It is necessary to carry out design from the topology and system-level coordinated control to solve the low-frequency pulsation problem. In the present invention, through the coordinated control of the subsystems in the flexible interconnection device, there is no need to inject additional common-mode voltage and circulating current components, the number of subsystems (also called sub-modules) can be reduced, thereby reducing the control complexity and improving the efficiency. And through the subsystem coordinated control strategy, the problems of large low-frequency pulsations in the bridge arm and low system efficiency can be actively eliminated, enabling the flexible interconnection device to operate reliably and providing sufficient active and reactive power support for the bilateral power grid.

[0075] The flexible interconnection device can connect two regional power grids with the same or different frequencies, for example Figure 2The flexible interconnection device connects power grid 1 and power grid 2. When both power grid 1 and power grid 2 are AC power grids, the flexible interconnection device can be an AC interconnection device. The flexible interconnection device can be composed of more than n subsystems connected in series or in parallel, where n is an integer greater than or equal to 2. For example, but not limited to, it is composed of subsystem 1, subsystem 2, subsystem 3, and subsystem 4 to meet the requirements of high-voltage and large-capacity flexible interconnection devices. The subsystems can be composed of, for example, but not limited to, one or more of M3C, polygon converters, Y-type converters, etc. The capacities of the n subsystems can be equal or unequal.

[0076] The coordinated control of the flexible interconnection device in the embodiments of the present invention is mainly for the coordinated control of the subsystems in the flexible interconnection device. The subsystem coordinated control strategy has the ability to respond to the system dispatching instruction control. According to the dispatching instruction, the instruction can be sent to the subsystems of the flexible interconnection device according to the algorithm to achieve coordinated control. In the embodiments of the present invention, the subsystem coordinated control strategy can decompose the dispatching instruction into multiple groups of active and reactive power instructions according to the principle of matching the power factors on both sides and send them to different subsystems.

[0077] Specifically, the subsystem coordinated control strategy can first perform active power demand configuration and then perform reactive power demand configuration.

[0078] The active power demand configuration information includes the number of subsystems that meet the active power demand. In step 101 above, based on the received dispatching instruction, according to the principle of matching the power factors on both sides of the subsystems, the active power distribution formula can be used to determine the number of subsystems that meet the active power demand. For example, the active power distribution formula can adopt a rounding instruction to achieve the use of the minimum number of converter valves while meeting the active power demand.

[0079] In one implementation, the active power distribution formula satisfies the following formula:

[0080] where a is the number of subsystems that meet the active power demand, round is a function for rounding, P ref is the dispatching instruction, S N is the capacity of each subsystem. Assume that the number of subsystems in the flexible interconnection device is n, and n > a. Exemplarily, the capacity S of a subsystems N can meet the active power demand.

[0081] When configuring the reactive power demand, it can be considered whether the reactive power demands on both sides of the subsystems are the same, and then the reactive power demand configuration is carried out accordingly.

[0082] In one implementation, in step 102 above, if the reactive power demands on both sides of each subsystem for meeting the reactive power requirement are the same, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, reactive power is allocated to each subsystem for meeting the reactive power requirement according to the principle of equal reactive power sharing, and reactive power demand configuration information is obtained. In this implementation, the reactive power demand is configured according to the number of subsystems and the active power demand configuration. When the reactive power demands on both sides of the subsystem are the same, equal reactive power sharing can be carried out for allocation. For example, when allocating, reactive power can be preferentially allocated to (n - a) subsystems, and the (n - a) subsystems are the remaining subsystems other than the a subsystems that achieve the active power demand configuration.

[0083] In another implementation of this method, in step 102 above, if the reactive power demands on both sides of each subsystem for meeting the reactive power requirement are different, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, each subsystem for meeting the reactive power requirement is divided into two groups of subsystems; according to the subsystem margin configuration principle, equal reactive power sharing is carried out for one group of subsystems in the two groups of subsystems, and surplus reactive power allocation is carried out for the other group of subsystems, and reactive power demand configuration information is obtained.

[0084] Assume that the reactive power demands on both sides of the subsystem are Q1 and Q2 respectively and are different. The reactive power demand is divided into two groups. One group is the equal reactive power Q on both sides a , and one group is the surplus reactive power Q b .

[0085] Among them, the surplus reactive power is the difference between the reactive power demands on both sides. For example, the process of carrying out surplus reactive power allocation for the other group of subsystems satisfies the following formula:

[0086] Q b = Q1 - Q2; where Q b is the surplus reactive power of the subsystem, Q1 and Q2 are the reactive power demands on both sides of the subsystem respectively, and Q1 and Q2 are not equal.

[0087] The equal reactive power on both sides can be equal reactive power sharing according to the subsystem margin configuration principle, and this process can satisfy the following formula:

[0088] Among them, Q ref1 is the reactive power reference value of the subsystem, S N is the capacity of the subsystem, and P ref1 is the reactive power command of the subsystem. According to Q ref1 , the equal reactive power Q a on both sides of the subsystem can be determined. For example, Q ref1 is used as the equal reactive power Q a on both sides of the subsystem.。In this process, subsystem 1 is taken as an example for illustration. For the remaining subsystems, the process shown in this example can be referred to, so as to complete the reactive power demand configuration.

[0089] After the active power demand configuration information and reactive power demand configuration information are determined, the scheduling instructions can be divided into active power instructions and reactive power instructions. By splitting the scheduling instructions, the corresponding instructions can be distributed to the corresponding subsystem instructions, so as to achieve the coordinated control of the subsystems.

[0090] Considering the (n-a) subsystems for realizing the reactive power demand, since there is only unilateral reactive power and no active power, the loss can be reduced by methods such as control strategy switching and unilateral converter valve controller locking. For example, in step 104 above, when controlling the subsystems that meet the reactive power demand according to the reactive power instructions, the control strategy switching and / or unilateral converter valve controller locking can be adopted according to the reactive power instructions to control the subsystems that meet the reactive power demand. By locking the converter valve controller on the other side, the loss can be reduced.

[0091] In one implementation manner, a flexible interconnection device includes a subsystem coordination controller, subsystems, a system-level controller, a station-level controller, and n subsystems. When these coordination controllers and n subsystems interact, it can be that after the subsystems receive the coordination controller instructions, they are sent to the system-level control to generate the station-level control reference value instructions; after the station-level control receives the station-level control reference value instructions, the valve-level control instructions are generated through the controller and sent to the converter valve to achieve the active and reactive power control of the subsystems, so as to achieve the coordinated control of the subsystems. Specifically, in 104 above, the subsystem coordination controller in the flexible interconnection device can be used to send the active power instructions and reactive power instructions to the subsystems that meet the active power demand and the subsystems that meet the reactive power demand respectively; the subsystems that meet the active power demand and the subsystems that meet the reactive power demand are used to send the active power instructions and reactive power instructions to the system-level controller of the flexible interconnection device; the system-level controller is used to generate the station-level control reference value instructions according to the active power instructions and reactive power instructions; the station-level controller of the flexible interconnection device is used to generate the valve-level control instructions according to the station-level control reference value instructions and send them to the converter valve in each subsystem to complete the coordinated control of the subsystems in the flexible interconnection device.

[0092] Illustrated with a specific embodiment, the system-level control consists of the control on the grid A side and the control on the grid B side, including but not limited to DC voltage control, sub-module average capacitor voltage control, active power control, reactive power control, AC voltage control, etc., see Figure 3As shown, the subsystem consists of several branch sub-modules (SM). When the circuit breakers CB1, CB2, and CB3 are opened, the interactive connection device is disconnected from the B-side power grid. M3C is switched from the interconnection mode to the reactive power support mode, and the active power flows through other M3C modules.

[0093] In one implementation, by setting the reactive power commands on both sides of the subsystem to be equal, the reactive power of the converter valves is made equal, thereby achieving the power factor and the input current I im and the output current I om to be equal.

[0094] Then, set the voltage U im at the input side of Grid 1 and the voltage U om component at the output side of Grid 2 to be the same. For example, but not limited to, by using a transformer tap changer in combination with a static var generator (SVG), the voltage U im at the input side of Grid 1 and the voltage U om at the output side of Grid 2 can be made equal through multi-objective control or coordination.

[0095] Taking the multi-objective coordination method to make the voltage U im on the Grid 1 side and the voltage U om on the Grid 2 side equal as an example, where U th2 is a preset voltage deviation threshold:

[0096] When the voltage deviation |U im - U om | ≤ U th2 , SVG starts to work;

[0097] When the voltage deviation U th2 ≤ |U im - U om |, considering that the tap changer cannot be adjusted continuously, the voltage adjustment is jointly achieved by SVG and the tap changer, and SVG meets the requirement of continuous adjustment.

[0098] Through the above settings, the active elimination of the differential frequency component and the reduction of voltage fluctuation are achieved. The active elimination of the differential frequency component and the reduction of voltage fluctuation by the above settings can be reflected through the following specific analysis:

[0099] Taking the subsystem as M3C as an example, the arm power component p au is the product of the arm current i au and the arm voltage u au :

[0100]

[0101] Among them, Uim 、I im are the voltage and current on the grid 1 side respectively, and U om 、I om are the voltage and current on the grid 2 side respectively, ω1 and ω2 are the frequencies of the two side grids respectively. θ and α are the phase angles of the grid voltages respectively, is the phase angle difference between the voltage and the current, and t is the unit time.

[0102] The arm components mainly include the DC component, ω1 + ω2, ω1 - ω2 and 2ω components. When integrating the power, the difference frequency component ω1 - ω2 appears in the denominator. See the following formula:

[0103]

[0104] Among them, V arma represents the arm voltage, v c * represents the sub-module voltage, and C represents the sub-module capacitance value, represents the parameter related to the phase angle.

[0105] If ω1 - ω2 is close, an infinite term appears, resulting in an increase in voltage fluctuation. See the following formula:

[0106]

[0107] However, under the control of the above settings, it can be seen from the following formula that the difference frequency component is actively eliminated and the voltage fluctuation is reduced:

[0108]

[0109] In the embodiment of the present invention, the subsystem coordinated control has the ability to respond to the system dispatching instruction control. According to the dispatching instruction, the instruction is sent to the flexible interconnection subsystem coordinated control according to the algorithm. The subsystem coordinated control decomposes the dispatching instruction value into multiple groups of active and reactive power instructions according to the two-side power factor matching principle and sends them to different subsystems. After receiving the coordinated controller instruction, the subsystem sends it to the system-level control and generates a station-level control reference value instruction; after receiving the station-level control reference value instruction, the station-level control generates a valve-level control instruction through the controller and sends it to the converter valve to realize the active and reactive power control of the subsystem, thereby realizing the subsystem coordinated control. The present invention proposes the coordinated control of the high-voltage large-capacity flexible interconnection device subsystem, which does not require additional injection of common-mode voltage, can reduce the number of sub-modules, and improve the system efficiency.

[0110] Embodiment 2:

[0111] Based on the same inventive concept, the present invention also provides a coordinated control system for a flexible interconnection device. The structural schematic diagram is as Figure 4 shown, including:

[0112] The active power demand configuration module is used to configure the active power demand of the flexible interconnection device based on the received scheduling instruction according to the principle of power factor matching on both sides of the subsystem, so as to obtain the active power demand configuration information;

[0113] The reactive power demand configuration module is used to configure the reactive power demand of the flexible interconnection device according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combined with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, according to the preset reactive power distribution rule, so as to obtain the reactive power demand configuration information;

[0114] The scheduling instruction division module is used to divide the scheduling instruction into an active power instruction and a reactive power instruction according to the active power demand configuration information and the reactive power demand configuration information;

[0115] The coordination control module is used to control the subsystems that meet the active power demand according to the active power instruction and control the subsystems that meet the reactive power demand according to the reactive power instruction, so as to complete the coordination control of the subsystems in the flexible interconnection device.

[0116] In a specific implementation manner, the active power demand configuration information includes the number of subsystems that meet the active power demand;

[0117] The active power demand configuration module is specifically used for:

[0118] Based on the received scheduling instruction, according to the principle of power factor matching on both sides of the subsystem, using the active power distribution formula, determine the number of subsystems that meet the active power demand.

[0119] In a specific implementation manner, the active power distribution formula satisfies the following formula:

[0120] Where a is the number of subsystems that meet the active power demand, round is the function for rounding, P ref is the scheduling instruction, and S N is the capacity of the subsystem.

[0121] In a specific implementation manner, the reactive power demand configuration module is specifically used for:

[0122] If the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand are that the reactive power demands on both sides of each subsystem are the same, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, according to the principle of equal reactive power sharing, allocate reactive power to each subsystem for meeting the reactive power demand, so as to obtain the reactive power demand configuration information.

[0123] In a specific implementation manner, the reactive power demand configuration module is specifically used for:

[0124] If the reactive power demands on both sides of each subsystem for meeting the reactive power demand are different, then according to the number of subsystems and the active power demand configuration information in the flexible interconnection device, each subsystem for meeting the reactive power demand is divided into two groups of subsystems;

[0125] According to the subsystem margin configuration principle, reactive power equalization is performed on one group of subsystems in the two groups of subsystems, and surplus reactive power distribution is performed on the other group of subsystems to obtain reactive power demand configuration information.

[0126] In a specific implementation manner, the reactive power demand configuration module is specifically used for the process of performing reactive power equalization on one group of subsystems in the two groups of subsystems according to the subsystem margin configuration principle, and the process satisfies the following formula:

[0127] where Q ref1 is the subsystem reactive power reference value, S N is the capacity of the subsystem, and P ref1 is the subsystem reactive power command.

[0128] In a specific implementation manner, the reactive power demand configuration module is specifically used for the process of performing surplus reactive power distribution on the other group of subsystems, and the process satisfies the following formula:

[0129] Q b = Q1 - Q2; where Q b is the surplus reactive power of the subsystem, Q1 and Q2 are the reactive power demands on both sides of the subsystem respectively, and Q1 and Q2 are not equal.

[0130] In a specific implementation manner, the coordination control module is specifically used for:

[0131] According to the reactive power command, the control strategy is switched and / or the unilateral converter valve controller is blocked to control the subsystems that meet the reactive power demand.

[0132] In a specific implementation manner, the coordination control module is specifically used for:

[0133] Using the subsystem coordination controller in the flexible interconnection device, the active power command and the reactive power command are respectively sent to the subsystems that meet the active power demand and the subsystems that meet the reactive power demand;

[0134] Using the subsystems that meet the active power demand and the subsystems that meet the reactive power demand to send the active power command and the reactive power command to the system-level controller of the flexible interconnection device;

[0135] Using the system-level controller to generate the station-level control reference value command according to the active power command and the reactive power command;

[0136] The station-level controller using the flexible interconnection device generates valve-level control instructions according to the station-level control reference value instructions and sends them to the converter valves in each subsystem to complete the coordinated control of the subsystems in the flexible interconnection device.

[0137] Embodiment 3:

[0138] As Figure 5 shown, the present invention also provides an electronic device, which may be a computer device, a single-chip microcomputer device, a smart mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected through a bus; the memory can be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory can also be used to store data, and this data can be called and / or modified when the instructions are executed.

[0139] The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of a coordinated control method of a flexible interconnection device in the above embodiment.

[0140] Embodiment 4:

[0141] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device-readable storage medium (Memory). The electronic device-readable storage medium is a memory device in the electronic device, used to store programs and data. It can be understood that the storage medium here can include both the built-in storage medium in the electronic device and, of course, the extended storage medium supported by the electronic device. The storage medium provides a storage space, and this storage space stores the operating system of the terminal. Moreover, in this storage space, there is also stored one or more instructions suitable for being loaded and executed by the processor. These instructions can be one or more executable programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. By the processor loading and executing one or more instructions stored in the storage medium, the steps of the coordinated control method of a flexible interconnection device in the above embodiments can be implemented.

[0142] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0143] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or multiple flows and / or blocks

[0144] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions specified in Figure 1 one or more of the flows Figure 1 or multiple flows and / or blocks

[0145] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable apparatus to generate a computer-implemented process, thereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one process or a plurality of processes and / or one block or a plurality of blocks in the flow Figure 1 one process or a plurality of processes and / or Figure 1 one block or a plurality of blocks.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the scope of its protection. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that after reading the present invention, various changes, modifications or equivalent replacements can still be made to the specific implementation manners of the application. However, these changes, modifications or equivalent replacements are all within the scope of protection of the claims pending for approval of the application.

Claims

1. A coordinated control method for a flexible interconnection device, characterized in that, Including: Based on the received scheduling instruction, according to the principle of power factor matching on both sides of the subsystem, configure the active power demand of the flexible interconnection device to obtain the active power demand configuration information; According to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combined with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, configure the reactive power demand of the flexible interconnection device according to the preset reactive power distribution rule to obtain the reactive power demand configuration information; According to the active power demand configuration information and the reactive power demand configuration information, divide the scheduling instruction into an active power instruction and a reactive power instruction; Control the subsystems that meet the active power demand according to the active power instruction, and control the subsystems that meet the reactive power demand according to the reactive power instruction to complete the coordinated control of the subsystems in the flexible interconnection device.

2. The method according to claim 1, wherein The active power demand configuration information includes the number of subsystems that meet the active power demand; The configuring the active power demand of the flexible interconnection device based on the received scheduling instruction according to the principle of power factor matching on both sides of the subsystem to obtain the active power demand configuration information includes: Based on the received scheduling instruction, according to the principle of power factor matching on both sides of the subsystem, use the active power distribution formula to determine the number of subsystems that meet the active power demand.

3. The method according to claim 2, wherein The active power distribution formula satisfies the following formula: where a is the number of subsystems that meet the active power demand, round is a function for rounding, and P ref is the scheduling instruction, and S N is the capacity of the subsystem.

4. The method according to claim 1, characterized in that, The configuring the reactive power demand of the flexible interconnection device according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combined with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, according to the preset reactive power distribution rule to obtain the reactive power demand configuration information includes: If the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand are the same for each subsystem, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, distribute the reactive power evenly to each subsystem for meeting the reactive power demand according to the principle of equal reactive power sharing to obtain the reactive power demand configuration information.

5. The method according to claim 1 or 4, characterized in that The configuring the reactive power demand of the flexible interconnection device according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combined with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, according to the preset reactive power distribution rule to obtain the reactive power demand configuration information includes: If the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand are different for each subsystem, then according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, divide each subsystem for meeting the reactive power demand into two groups of subsystems; According to the principle of subsystem margin configuration, evenly distribute the reactive power to one group of the two groups of subsystems, and perform surplus reactive power distribution on the other group of subsystems to obtain the reactive power demand configuration information.

6. The method according to claim 5, wherein The process of evenly distributing the reactive power to one group of the two groups of subsystems according to the principle of subsystem margin configuration satisfies the following formula: Among them, Q ref1 is the reactive power reference value of the subsystem, S N is the capacity of the subsystem, P ref1 is the reactive power command of the subsystem.

7. The method according to claim 5, wherein The process of performing surplus reactive power distribution on the other group of subsystems satisfies the following formula: Q b = Q1 - Q2; where Q b is the surplus reactive power of the subsystem, and Q1 and Q2 are the reactive power demands on both sides of the subsystem respectively, and Q1 and Q2 are not equal.

8. The method according to claim 1, characterized in that, The controlling the subsystems that meet the reactive power demand according to the reactive power instruction includes: According to the reactive power command, a control strategy switching and / or a unilateral converter valve controller blocking are adopted to control the subsystem that meets the reactive power demand.

9. The method according to claim 1, characterized in that The coordinated control of the subsystems in the flexible interconnection device is completed by controlling the subsystem that meets the active power demand according to the active power command and controlling the subsystem that meets the reactive power demand according to the reactive power command, including: Using the subsystem coordination controller in the flexible interconnection device, sending the active power command and the reactive power command to the subsystem that meets the active power demand and the subsystem that meets the reactive power demand respectively; Using the subsystem that meets the active power demand and the subsystem that meets the reactive power demand to send the active power command and the reactive power command to the system-level controller of the flexible interconnection device; Using the system-level controller to generate a station-level control reference value command according to the active power command and the reactive power command; Using the station-level controller of the flexible interconnection device to generate a valve-level control command according to the station-level control reference value command and sending it to the converter valves in each subsystem to complete the coordinated control of the subsystems in the flexible interconnection device.

10. A coordinated control system for a flexible interconnection device, characterized in that, Including: An active power demand configuration module, configured to configure the active power demand of the flexible interconnection device based on the received dispatching instruction according to the principle of power factor matching on both sides of the subsystem, and obtain the active power demand configuration information; A reactive power demand configuration module, configured to configure the reactive power demand of the flexible interconnection device according to the number of subsystems in the flexible interconnection device and the active power demand configuration information, combined with the reactive power demand conditions on both sides of each subsystem for meeting the reactive power demand, according to a preset reactive power distribution rule, and obtain the reactive power demand configuration information; A dispatching instruction division module, configured to divide the dispatching instruction into an active power command and a reactive power command according to the active power demand configuration information and the reactive power demand configuration information; A coordinated control module, configured to control the subsystem that meets the active power demand according to the active power command and control the subsystem that meets the reactive power demand according to the reactive power command to complete the coordinated control of the subsystems in the flexible interconnection device.

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