CN115577961B - Test and evaluation method for performance of novel sea wind field flexible direct-current power transmission converter system - Google Patents
Test and evaluation method for performance of novel sea wind field flexible direct-current power transmission converter system Download PDFInfo
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Abstract
The application discloses a test evaluation method, a device, electronic equipment and a storage medium for performance of a novel sea wind field flexible direct-current power transmission and conversion system, wherein the method comprises the following steps: obtaining double-end converter valve data, direct-current voltage data and high-low level change times of a direct-current power transmission converter system in a circulating current full-power operation mode, calculating heat loss of the double-end converter valve, calculating direct-current voltage unbalance degree, calculating average switching frequency according to the high-low level change times, switching the operation mode of the direct-current power transmission converter system, calculating to obtain a direct-current voltage operation range when the direct-current power transmission converter system normally operates, and summarizing the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range to obtain evaluation result data of the direct-current power transmission converter system. The method is beneficial to solving the technical problem that the conventional method for evaluating the running performance of the direct current transmission system cannot be suitable for the novel offshore wind farm flexible direct current transmission converter system with hybrid topology, and ensures the evaluation efficiency of the direct current transmission converter system.
Description
Technical Field
The application relates to the technical field of running performance of a direct-current transmission system, in particular to a test evaluation method and device for performance of a novel sea wind field flexible direct-current transmission converter system, electronic equipment and a storage medium.
Background
The most commonly used offshore wind farm grid-connected transmission scheme at present is a high-voltage alternating-current transmission system, but the offshore wind farm direct-current transmission system gradually shows the advantages. Many revolutionary changes are occurring in modern transmission and distribution networks, and the demand for direct current transmission is increasing. For example, load centers are increasingly relying on power delivered over long distances, renewable energy sources such as large wind farms to generate electricity, and power networking requires accurate and flexible control of power delivery. Compared with alternating current transmission, the frequency and phase problems of an associated alternating current system are not needed to be considered when direct current transmission is adopted, and the transmission power can be rapidly and accurately controlled due to small interference and influence among interconnected systems, so that the stability of the system is effectively improved. The direct current cable also has no problem of charging current, so long-distance power transmission can be realized.
In the conventional dc delivery scheme, a conventional dc power transmission system is common. The conventional direct current transmission is realized by adopting a thyristor technology to realize a rectifier and an inverter. Thyristors are semi-controlled devices which can only be switched on and off, and the converter operation in principle has to be commutated by means of a mains voltage, also called mains commutated converter (Line Commutated Converter, LCC). However, the conventional direct current transmission adopts a semi-control device such as a thyristor, which can only control the opening of the valve but cannot control the closing of the valve, and the valve current is reduced below the maintaining current of the converter valve by means of the voltage of an alternating current bus when the valve is closed. This results in that the conventional dc power transmission cannot supply the weak ac system and, since it has to be commutated by means of the voltage of the receiving network, there is a risk of commutation failure, which leads to a short power transmission interruption. The conventional direct current transmission also has the defects of large output harmonic wave during phase change, and huge investment and occupation area of a converter station. Therefore, the conventional direct current power transmission is more suitable for occasions such as remote large-capacity power transmission, asynchronous networking and the like, and is difficult to apply to the aspects of new energy power generation access, isolated load power supply, urban power supply and the like.
Therefore, a novel hybrid topology flexible direct current transmission converter system of the offshore wind farm is provided, wherein a diode converter valve is used for an offshore boosting platform, and an MMC converter valve is used for an onshore switching station. The novel flexible direct current transmission converter system of the hybrid topology offshore wind farm has more advantages in long-distance large-capacity offshore wind power transmission, but the system is lack of a special operation performance test evaluation method at present.
Therefore, in order to ensure the evaluation efficiency of the direct-current transmission converter system, the technical problem that the existing operation performance evaluation method of the direct-current transmission system cannot be suitable for the novel offshore wind farm flexible direct-current transmission converter system with hybrid topology is solved, and a system performance evaluation method needs to be constructed.
Disclosure of Invention
The application provides a test and evaluation method for the performance of a novel offshore wind farm flexible direct-current power transmission and conversion system, and solves the technical problem that the existing operation performance evaluation method of the direct-current power transmission system cannot be suitable for the novel offshore wind farm flexible direct-current power transmission and conversion system with hybrid topology.
In a first aspect, the application provides a test and evaluation method for performance of a novel marine wind farm flexible direct-current power transmission and conversion system, which comprises the following steps:
obtaining double-end converter valve data, direct-current voltage data and high-low level change times of a direct-current transmission converter system in a circulating current full-power operation mode;
calculating the heat loss of the double-end converter valve corresponding to the double-end converter valve data;
calculating the direct-current voltage unbalance degree corresponding to the direct-current voltage data;
calculating the average switching frequency of the direct-current transmission converter system according to the high-low level change times;
switching the operation mode of the direct-current transmission converter system into a half-voltage full-load operation mode, and calculating to obtain a direct-current voltage operation range of the direct-current transmission converter system when the direct-current transmission converter system normally operates in the half-voltage full-load operation mode;
and summarizing the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range to obtain evaluation result data of the direct-current power transmission and conversion system.
Optionally, calculating the heat loss of the double-ended converter valve corresponding to the double-ended converter valve data includes:
calculating the heat loss of the cooling liquid corresponding to the double-end converter valve data;
and calculating the heat loss of the double-end converter valve corresponding to the double-end converter valve data by combining a preset calculation coefficient based on the heat loss of the cooling liquid.
Optionally, switching the operation mode of the dc power transmission and conversion system to a half-voltage full-load operation mode, and calculating to obtain a dc voltage operation range of the dc power transmission and conversion system when the dc power transmission and conversion system is operating normally in the half-voltage full-load operation mode, including:
switching an operation mode of a fan network side converter in the direct current transmission and conversion system to be a constant direct current voltage control mode, and switching an operation mode of a fan side converter to be a constant active power control mode;
when the operation modes of all fan network side converters and fan side converters in the direct-current transmission and conversion system are switched, the operation mode of the direct-current transmission and conversion system is automatically switched to the half-voltage full-load operation mode;
and when the direct-current transmission and conversion system is normally used in the half-voltage full-load operation mode, the operation parameters of the direct-current transmission and conversion system are adjusted to obtain the direct-current voltage operation range of the direct-current transmission and conversion system.
In a second aspect, the application provides a test and evaluation device for performance of a novel marine wind farm flexible direct-current power transmission and conversion system, which comprises:
the acquisition module is used for acquiring double-end converter valve data, direct-current voltage data and high-low level change times of the direct-current transmission converter system in a circulating current full-power operation mode;
the loss module is used for calculating the heat loss of the double-end converter valve corresponding to the double-end converter valve data;
the voltage module is used for calculating the direct-current voltage unbalance corresponding to the direct-current voltage data;
the switching module is used for calculating the average switching frequency of the direct-current transmission converter system according to the high-low level change times;
the range module is used for switching the operation mode of the direct-current transmission converter system into a half-voltage full-load operation mode, and calculating to obtain the direct-current voltage operation range of the direct-current transmission converter system when the direct-current transmission converter system normally operates in the half-voltage full-load operation mode;
and the evaluation module is used for summarizing the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range to obtain evaluation result data of the direct-current power transmission and conversion system.
Optionally, the loss module includes:
the cooling sub-module is used for calculating the heat loss of the cooling liquid corresponding to the double-end converter valve data;
and the loss submodule is used for calculating the heat loss of the double-end converter valve corresponding to the double-end converter valve data based on the heat loss of the cooling liquid and combining a preset calculation coefficient.
Optionally, the range module includes:
the switching submodule is used for switching the running mode of the fan network side converter in the direct-current transmission converter system into a constant direct-current voltage control mode and switching the running mode of the fan side converter into a constant active power control mode;
the automatic sub-module is used for automatically switching the operation mode of the direct-current power transmission converter system into the half-voltage full-load operation mode when the operation modes of all fan grid-side converters and fan-side converters in the direct-current power transmission converter system are switched;
and the range submodule is used for adjusting the operation parameters of the direct-current transmission and conversion system when the direct-current transmission and conversion system is normally used in the half-voltage full-load operation mode to obtain the direct-current voltage operation range of the direct-current transmission and conversion system.
In a third aspect, the application provides an electronic device comprising a processor and a memory storing computer readable instructions which, when executed by the processor, perform the steps of the method as provided in the first aspect above.
In a fourth aspect, the present application provides a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method as provided in the first aspect above.
From the above technical scheme, the application has the following advantages: the application provides a system performance evaluation method, which comprises the steps of obtaining double-end converter valve data, direct-current voltage data and high-low average change times of a direct-current power transmission converter system in a circulating full-power operation mode, calculating heat loss of the double-end converter valve corresponding to the double-end converter valve data, calculating direct-current voltage unbalance degree corresponding to the direct-current voltage data, calculating average switching frequency of the direct-current power transmission converter system according to the high-low average change times, switching the operation mode of the direct-current power transmission converter system into a half-voltage full-load operation mode, calculating a direct-current voltage operation range of the direct-current power transmission converter system when the direct-current power transmission converter system normally operates in the half-voltage full-load operation mode, summarizing the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range, and obtaining evaluation result data of the direct-current converter system.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a flowchart of a first embodiment of a method for testing and evaluating the performance of a novel marine wind farm flexible direct current power transmission and conversion system;
FIG. 2 is a flowchart illustrating a second embodiment of a method for testing and evaluating the performance of a novel marine wind farm flexible direct current power transmission and conversion system according to the present application;
FIG. 3 is a block diagram of a voltage sensor mounting node in a DC power transmission converter system according to the present application;
fig. 4 is a block diagram of an embodiment of a test and evaluation device for performance of a novel sea wind field flexible direct current power transmission and conversion system.
Detailed Description
The embodiment of the application provides a test and evaluation method for the performance of a novel offshore wind farm flexible direct-current power transmission and conversion system, which is used for solving the technical problem that the existing operation performance evaluation method for the direct-current power transmission system cannot be suitable for the novel offshore wind farm flexible direct-current power transmission and conversion system with hybrid topology.
In order to make the objects, features and advantages of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a flowchart of a first embodiment of a test evaluation method for performance of a novel soft direct current power transmission and conversion system of a sea wind farm, which includes:
step S101, obtaining double-end converter valve data, direct-current voltage data and high-low level change times of a direct-current transmission converter system in a circulating current full-power operation mode;
step S102, calculating heat loss of the double-end converter valve corresponding to the double-end converter valve data;
in the embodiment of the application, the heat loss of the cooling liquid corresponding to the double-end converter valve by the double-end converter valve data is calculated, and the heat loss of the double-end converter valve corresponding to the double-end converter valve by the double-end converter valve data is calculated based on the heat loss of the cooling liquid and combined with a preset calculation coefficient
Step S103, calculating the direct-current voltage unbalance degree corresponding to the direct-current voltage data;
step S104, calculating the average switching frequency of the direct-current transmission converter system according to the high-low level change times;
step S105, switching the operation mode of the dc power transmission converter system to a half-voltage full-load operation mode, and calculating to obtain a dc voltage operation range of the dc power transmission converter system when the dc power transmission converter system is operating normally in the half-voltage full-load operation mode;
in the embodiment of the application, the operation mode of the fan grid-side converter in the direct-current transmission and conversion system is switched to be a constant direct-current voltage control mode, and the operation mode of the fan-side converter is switched to be a constant active power control mode, when the operation modes of all the fan grid-side converters and the fan-side converters in the direct-current transmission and conversion system are switched to be completed, the operation mode of the direct-current transmission and conversion system is automatically switched to be the half-voltage full-load operation mode, and when the direct-current transmission and conversion system is normally used in the half-voltage full-load operation mode, the operation parameters of the direct-current transmission and conversion system are adjusted, so that the direct-current voltage operation range of the direct-current transmission and conversion system is obtained.
Step S106, summarizing the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range to obtain evaluation result data of the direct-current power transmission converter system;
according to the test and evaluation method for the performance of the novel sea wind field flexible direct-current power transmission and conversion system, the double-end converter valve data, the direct-current voltage data and the high-low average change times of the direct-current power transmission and conversion system in the circulating full-power operation mode are obtained, the heat loss of the double-end converter valve corresponding to the double-end converter valve data is calculated, the direct-current voltage unbalance degree corresponding to the direct-current voltage data is calculated, the average switching frequency of the direct-current power transmission and conversion system is calculated according to the high-low average change times, the operation mode of the direct-current power transmission and conversion system is switched to the half-voltage full-load operation mode, the direct-current voltage operation range of the direct-current power transmission and conversion system is calculated in the half-voltage full-load operation mode, the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range are summarized, the evaluation result data of the direct-current power transmission and conversion system is obtained, and the existing method for evaluating the performance of the direct-current power transmission and conversion system is suitable for the novel sea wind power transmission and conversion system with the improved performance.
In a second embodiment, referring to fig. 2, fig. 2 is a flowchart of a testing and evaluating method for performance of a novel soft direct current power transmission and conversion system of a sea wind farm, including:
step S201, obtaining double-end converter valve data, direct-current voltage data and high-low level change times of a direct-current transmission converter system in a circulating current full-power operation mode;
in the embodiment of the application, the direct-current transmission converter system is operated in a circulating full power mode, and power is transmitted through an offshore diode converter valve and an onshore MMC converter valve of the direct-current transmission converter system, so that double-end converter valve data, direct-current voltage data and high-low level change times of the direct-current transmission converter system are obtained.
In a specific implementation, the onshore MMC converter valve adopts a constant direct current voltage control mode, and the double-end converter valve data comprises diode converter valve cooling liquid flow Q B MMC converter valve coolant flow Q M Water inlet temperature t of diode converter valve set 1B Outlet water temperature t of valve block 2B MMC converter valve valves temperature t that intakes 1M Outlet water temperature t of valve block 2M Diode converter valve DC side active power P B Active power P of alternating-current side of MMC converter valve M Reactive power Q of alternating-current side of MMC converter valve M The density ρ of the cooling liquid and the specific heat capacity C of the cooling liquid P 。
Reactive compensation devices such as a reactor and a filter in a direct current transmission converter system are put into a long-term actual running state to enable the reactive compensation devices to run stably for a period of time, and the direct current voltage of each six-pulse converter can be detected in real time by monitoring the direct current voltage of each six-pulse converter in real time through a voltage sensor arranged on the six-pulse converter.
Reactive compensation devices such as a reactor and a filter in a direct-current transmission converter system are put into operation for a long time according to a long-term actual operation state, so that the reactive compensation devices stably operate for a period of time, and the times n of changing all MMC submodules from low level to high level are monitored on And counting time t, and counting the change times of the MMC sub-module from low level to high level in a period of time through a digital chip.
Step S202, calculating the heat loss of the cooling liquid of the double-end converter valve corresponding to the double-end converter valve data;
in an embodiment of the application, the coolant heat loss of the double-ended converter valve is calculated.
In specific implementation, the power unit loss data is calculated equivalently by measuring the heat taken away by the heat exchange fluid, and the loss taken away by the cooling fluid in the diode converter valve and the MMC converter valve is calculated by substituting the data into a formula, wherein the calculation formula of the loss of the cooling fluid is specifically as follows:
P s ＝C P Q B ρΔt；
P g ＝C P Q M ρΔt；
wherein P is s For losses carried away by the cooling liquid in the diode converter valve, the unit is kW, P g For the loss brought away by the cooling liquid in the MMC converter valve, the unit is kW, C P The specific heat capacity of the cooling liquid is kJ/(kg.K), Q B The unit is m for the flow of the cooling liquid of the diode converter valve 3 /s，Q M The unit is m for the flow of the cooling liquid of the diode converter valve 3 Per s, ρ is the density of the cooling fluid in kg/m 3 Δt is the temperature rise of the cooling liquid, and the unit is K.
Step S203, calculating the heat loss of the double-end converter valve corresponding to the double-end converter valve data based on the heat loss of the cooling liquid and by combining a preset calculation coefficient;
in the embodiment of the application, based on the heat loss of the cooling liquid, the heat loss of the double-end converter valve corresponding to the double-end converter valve data is calculated according to a preset calculation coefficient.
In specific implementation, according to a calculation coefficient (the radiant heat accounts for 3% of the total loss), the heat loss ratio of the double-end converter valve is finally obtained according to a heat loss ratio calculation formula, wherein the heat loss ratio calculation formula is specifically as follows:
wherein eta B The heat loss ratio of the diode converter valve is expressed as eta M Heat loss for MMC converter valveRatio in% P B The active power of the direct current side of the diode converter valve is kW and P M Active power of alternating-current side of MMC converter valve, with unit of kW, R M Reactive power of alternating-current side of MMC converter valve is kW.
Step S204, calculating the direct-current voltage unbalance degree corresponding to the direct-current voltage data;
in the embodiment of the application, the corresponding direct-current voltage unbalance degree is calculated according to the direct-current voltage data.
In a specific implementation, referring to fig. 3, fig. 3 is a block diagram of a voltage sensor installation node in a dc power transmission converter system according to the present application, where 301 is a diode valve, 302 is a converter valve, 303, 304 are rectifier transformers, 305 is an MMC converter transformer, 306, 307, 308, 309 are voltage sensors, and 310 is a voltage sensor. The calculation formula of the direct-current voltage unbalance epsilon is specifically as follows:
wherein ε B The voltage is the direct-current voltage unbalance, and the unit is; u (U) i The unit is kV for the direct-current voltage value of four six-pulse outlets; u (U) min The minimum value of the direct current voltage of four six-pulse outlets is in kV; u (U) max The maximum value of the four six-pulse outlet direct current voltages is expressed in kV.
Step S205, calculating the average switching frequency of the direct-current transmission converter system according to the high-low level change times;
in the embodiment of the application, the average switching frequency of the direct-current transmission converter system is calculated by the change times of changing from low level to high level.
In a specific implementation, the formula calculation of the average switching frequency is specifically:
wherein f av The average switching frequency is expressed in Hz; n is n on The number of times of opening the MMC submodule; for statistical time, the unit is s.
Step S206, switching an operation mode of a fan network side converter in the direct current transmission and conversion system to be a constant direct current voltage control mode, and switching an operation mode of a fan side converter to be a constant active power control mode;
in the embodiment of the application, a group of twelve-pulse converters of the diode converter valve are firstly short-circuited before a test, the MMC converter valve is started and unlocked during the test, after the fan network side converter is charged to a stable state, the operation mode of the fan network side converter is switched, namely the fan network side converter is unlocked and set to be in a fixed direct current voltage control mode, the operation mode of the fan side converter is switched, namely the fan side converter is unlocked and set to be in an active power control mode, and the active power is increased to the rated power of the fan.
Step S207, when the operation modes of all fan grid-side converters and fan side converters in the direct-current power transmission and conversion system are switched, the operation mode of the direct-current power transmission and conversion system is automatically switched to the half-voltage full-load operation mode;
in the embodiment of the application, all fans are sequentially put into the system, and when the operation modes of all fans are changed, namely all fans are sequentially unlocked according to a specific operation strategy, the direct-current transmission and conversion system can enter a half-voltage full-load operation mode, so that the direct-current transmission and conversion system can be ensured to stably operate in the mode.
Step S208, when the direct-current transmission converter system is normally used in the half-voltage full-load operation mode, the operation parameters of the direct-current transmission converter system are adjusted to obtain the direct-current voltage operation range of the direct-current transmission converter system;
in the embodiment of the application, when the direct-current power transmission and conversion system is normally used in the half-voltage full-load operation mode, the operation parameters of the direct-current power transmission and conversion system are adjusted to obtain the optimal parameters, and the direct-current power transmission and conversion system is optimized to obtain the direct-current voltage operation range of the direct-current power transmission and conversion system by adopting the optimal parameters.
Step S209, summarizing the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range to obtain evaluation result data of the direct-current power transmission converter system;
in the embodiment of the application, the evaluation result data of the direct current transmission and conversion system is generated based on the heat loss, the direct current voltage unbalance degree, the average switching frequency and the direct current voltage operation range.
According to the test and evaluation method for the performance of the novel sea wind field flexible direct-current power transmission and conversion system, the double-end converter valve data, the direct-current voltage data and the high-low average change times of the direct-current power transmission and conversion system in the circulating full-power operation mode are obtained, the heat loss of the double-end converter valve corresponding to the double-end converter valve data is calculated, the direct-current voltage unbalance degree corresponding to the direct-current voltage data is calculated, the average switching frequency of the direct-current power transmission and conversion system is calculated according to the high-low average change times, the operation mode of the direct-current power transmission and conversion system is switched to the half-voltage full-load operation mode, the direct-current voltage operation range of the direct-current power transmission and conversion system is calculated in the half-voltage full-load operation mode, the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range are summarized, the evaluation result data of the direct-current power transmission and conversion system is obtained, and the existing method for evaluating the performance of the direct-current power transmission and conversion system is suitable for the novel sea wind power transmission and conversion system with the improved performance.
Referring to fig. 4, fig. 4 is a structural block diagram of an embodiment of a testing and evaluating device for performance of a novel soft direct current power transmission and conversion system of a sea wind farm according to the present application, including:
the acquisition module 401 is configured to acquire double-end converter valve data, direct-current voltage data and high-low level change times of the direct-current transmission converter system in a circulating current full-power operation mode;
a loss module 402, configured to calculate a heat loss of the double-ended converter valve corresponding to the double-ended converter valve data;
a voltage module 403, configured to calculate a dc voltage unbalance corresponding to the dc voltage data;
the switching module 404 is configured to calculate an average switching frequency of the dc power transmission converter system according to the number of the high-low level changes;
a range module 405, configured to switch an operation mode of the dc power transmission and conversion system to a half-voltage full-load operation mode, and calculate a dc voltage operation range of the dc power transmission and conversion system when the dc power transmission and conversion system is operating normally in the half-voltage full-load operation mode;
and the evaluation module 406 is configured to aggregate the heat loss, the dc voltage unbalance, the average switching frequency and the dc voltage operation range, and obtain evaluation result data of the dc power transmission and conversion system.
In an alternative embodiment, the loss module 402 includes:
the cooling sub-module is used for calculating the heat loss of the cooling liquid corresponding to the double-end converter valve data;
and the loss submodule is used for calculating the heat loss of the double-end converter valve corresponding to the double-end converter valve data based on the heat loss of the cooling liquid and combining a preset calculation coefficient.
In an alternative embodiment, the range module 405 includes:
the switching submodule is used for switching the running mode of the fan network side converter in the direct-current transmission converter system into a constant direct-current voltage control mode and switching the running mode of the fan side converter into a constant active power control mode;
the automatic sub-module is used for automatically switching the operation mode of the direct-current power transmission converter system into the half-voltage full-load operation mode when the operation modes of all fan grid-side converters and fan-side converters in the direct-current power transmission converter system are switched;
and the range submodule is used for adjusting the operation parameters of the direct-current transmission and conversion system when the direct-current transmission and conversion system is normally used in the half-voltage full-load operation mode to obtain the direct-current voltage operation range of the direct-current transmission and conversion system.
The embodiment of the application also provides electronic equipment, which comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the test evaluation method for the performance of the novel marine wind farm flexible direct current power transmission and conversion system.
The embodiment of the application also provides a computer storage medium, on which a computer program is stored, wherein the computer program realizes the steps of the test evaluation method for the performance of the novel sea-wind field flexible direct-current power transmission and conversion system according to any embodiment when being executed by the processor.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments provided in the present application, it should be understood that the methods, apparatuses, electronic devices and storage media disclosed in the present application may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a readable storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned readable storage medium includes: a usb disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (4)
1. The test and evaluation method for the performance of the novel marine wind field flexible direct-current power transmission and conversion system is characterized in that a marine booster platform of the novel marine wind field flexible direct-current power transmission and conversion system uses a diode converter valve and an onshore switching station uses an MMC converter valve, and the method comprises the following steps:
obtaining double-end converter valve data, direct-current voltage data and high-low level change times of a direct-current transmission converter system in a circulating current full-power operation mode;
and calculating the heat loss of the cooling liquid of the double-end converter valve corresponding to the double-end converter valve data through the following formula:
P s ＝C P Q B ρΔt
P g ＝C P Q M ρΔt
wherein P is s For losses carried away by the cooling liquid in the diode converter valve, the unit is kW, P g For the loss brought away by the cooling liquid in the MMC converter valve, the unit is kW, C P The specific heat capacity of the cooling liquid is kJ/(kg.K), Q B The unit is m for the flow of the cooling liquid of the diode converter valve 3 /s，Q M The unit is m for the flow of the cooling liquid of the diode converter valve 3 Per s, ρ is the density of the cooling fluid in kg/m 3 Δt is the temperature rise of the cooling liquid, and the unit is K;
based on the heat loss of the cooling liquid, and combining a preset calculation coefficient, calculating the heat loss of the double-end converter valve corresponding to the double-end converter valve according to the following formula:
wherein eta B The heat loss ratio of the diode converter valve is expressed as eta M The heat loss ratio of the MMC converter valve is expressed as the unit of P B The active power of the direct current side of the diode converter valve is kW and P M Changing for MMCActive power of alternating-current side of flow valve, with unit of kW, R M Reactive power of the alternating-current side of the MMC converter valve is kW;
calculating the direct-current voltage unbalance degree corresponding to the direct-current voltage data, wherein the calculation formula is as follows:
wherein ε B The voltage is the direct-current voltage unbalance, and the unit is; u (U) i The unit is kV for the direct-current voltage value of four six-pulse outlets; u (U) min The minimum value of the direct current voltage of four six-pulse outlets is in kV; u (U) max The maximum value of the direct current voltage of four six-pulse outlets is in kV;
calculating the average switching frequency of the direct-current transmission converter system according to the high-low level change times;
switching an operation mode of a fan network side converter in the direct current transmission and conversion system to be a constant direct current voltage control mode, and switching an operation mode of a fan side converter to be a constant active power control mode;
when the operation modes of all fan network side converters and fan side converters in the direct-current transmission and conversion system are switched, the operation mode of the direct-current transmission and conversion system is automatically switched to the half-voltage full-load operation mode;
when the direct-current transmission converter system is normally used in the half-voltage full-load operation mode, the operation parameters of the direct-current transmission converter system are adjusted to obtain a direct-current voltage operation range of the direct-current transmission converter system;
and summarizing the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range to obtain evaluation result data of the direct-current power transmission and conversion system.
2. The utility model provides a novel marine wind field gentle direct transmission current conversion system performance's test evaluation device which characterized in that, marine booster platform of novel marine wind field gentle direct transmission current conversion system uses diode converter valve, land switching station to use MMC converter valve, the device includes:
the acquisition module is used for acquiring double-end converter valve data, direct-current voltage data and high-low level change times of the direct-current transmission converter system in a circulating current full-power operation mode;
the loss module specifically comprises:
and the cooling submodule is used for calculating the heat loss of the cooling liquid of the double-end converter valve corresponding to the double-end converter valve data through the following formula:
P s ＝C P Q B ρΔt
P g ＝C P Q M ρΔt
wherein P is s For losses carried away by the cooling liquid in the diode converter valve, the unit is kW, P g For the loss brought away by the cooling liquid in the MMC converter valve, the unit is kW, C P The specific heat capacity of the cooling liquid is kJ/(kg.K), Q B The unit is m for the flow of the cooling liquid of the diode converter valve 3 /s，Q M The unit is m for the flow of the cooling liquid of the diode converter valve 3 Per s, ρ is the density of the cooling fluid in kg/m 3 Δt is the temperature rise of the cooling liquid, and the unit is K;
the loss submodule is used for calculating the heat loss of the double-end converter valve corresponding to the double-end converter valve data through the following formula based on the heat loss of the cooling liquid and combining with a preset calculation coefficient:
wherein eta B The heat loss ratio of the diode converter valve is expressed as eta M The heat loss ratio of the MMC converter valve is expressed as the unit of P B Direct current converter valve for diodeActive power on the flow side, in kW, P M Active power of alternating-current side of MMC converter valve, with unit of kW, R M Reactive power of the alternating-current side of the MMC converter valve is kW;
the voltage module is used for calculating the direct-current voltage unbalance degree corresponding to the direct-current voltage data, and the calculation formula is as follows:
wherein ε B The voltage is the direct-current voltage unbalance, and the unit is; u (U) i The unit is kV for the direct-current voltage value of four six-pulse outlets; u (U) min The minimum value of the direct current voltage of four six-pulse outlets is in kV; u (U) max The maximum value of the direct current voltage of four six-pulse outlets is in kV;
the switching module is used for calculating the average switching frequency of the direct-current transmission converter system according to the high-low level change times;
the range module specifically comprises:
the switching submodule is used for switching the running mode of the fan network side converter in the direct-current transmission converter system into a constant direct-current voltage control mode and switching the running mode of the fan side converter into a constant active power control mode;
the automatic sub-module is used for automatically switching the operation mode of the direct-current power transmission converter system into the half-voltage full-load operation mode when the operation modes of all fan grid-side converters and fan-side converters in the direct-current power transmission converter system are switched;
the range submodule is used for adjusting the operation parameters of the direct-current transmission and conversion system when the direct-current transmission and conversion system is normally used in the half-voltage full-load operation mode to obtain the direct-current voltage operation range of the direct-current transmission and conversion system;
and the evaluation module is used for summarizing the heat loss, the direct-current voltage unbalance degree, the average switching frequency and the direct-current voltage operation range to obtain evaluation result data of the direct-current power transmission and conversion system.
3. An electronic device comprising a processor and a memory storing computer readable instructions that, when executed by the processor, perform the method of claim 1.
4. A storage medium having stored thereon a computer program which, when executed by a processor, performs the method of claim 1.
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