Transmission power limit calculation method and system for flexible direct current power transmission system
A power transmission system and power transmission technology, which is applied in the direction of power transmission AC network, AC network circuit, circuit device, etc., can solve the problems of narrowing the operating range of the power circle and low flexibility
Active Publication Date: 2020-09-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology
However, the current method of analyzing the power limit of the DC converter station is to calculate the power circle on the premise of the known system transmission power capacity limit, and further reduce the power circle according to the system voltage, current and the modulation ratio of the converter station. However, due to the limitation of the transmission power capacity of the system, the flexibility in grid planning and construction is not high
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[0095] figure 1 It is a flow chart of the method for calculating the transmission power limit of the flexible direct current transmission system in the embodiment of the present invention, figure 2 It is a schematic diagram of the flexible direct current transmission system model in the embodiment of the present invention, such as Figure 1-2 As shown, a calculation method for the transmission power limit of the flexible direct current transmission system, including:
[0096] Step 101: Obtain the structural parameters of the AC system and the structural parameters of the DC converter station.
[0097] The structural parameters of the AC system include: the effective value of the rated line voltage of the AC system U S , AC system equivalent internal resistance R S , AC system equivalent internal inductance L S ; Transformation ratio k∠θ of the primary side and secondary side of the converter transformer, equivalent inductance of the converter transformer L T ; The AC lin...
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The invention discloses a transmission power limit calculation method and system for a flexible direct current power transmission system. The method comprises the steps of acquiring structural parameters of an alternating current system and structural parameters of a flexible direct current converter station; calculating the overall impedance of the alternating current system according to the structural parameters of the alternating current system and the structural parameters of the flexible direct-current converter station; calculating the output alternating current voltage of the flexible direct current converter station reduced to the primary side of a converter transformer in the alternating current system according to the structure parameters of the alternating current system and thestructure parameters of the flexible direct current converter station; determining a transmission power expression of the flexible direct current power transmission system according to the overall impedance of the alternating current system and the output alternating current voltage of the flexible direct current converter station reduced to the primary side of the converter transformer in the alternating current system; and calculating a transmission power limit value of the flexible direct current power transmission system according to the transmission power expression of the flexible direct current power transmission system and the structure parameters of the flexible direct current converter station. By adopting the method and the system, the method and the system can be suitable forflexible direct current power transmission systems with different structural parameters, the flexibility is high, and power grid planning and construction are facilitated.
Description
technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a method and system for calculating the transmission power limit of a flexible direct current transmission system. Background technique [0002] Flexible HVDC technology represented by Voltage Sourced Converter (Voltage Sourced Converter, VSC) and Modular Multilevel Converter (Modular Multilevel Converter, MMC) has the advantages of no commutation failure, power decoupling control, etc. It has been widely used in engineering. The flexible DC transmission system (Voltage Sourced Converter Based High Voltage Direct Current, VSC-MTDC) based on VSC and MMC technology has natural advantages in accommodating photovoltaic, wind power and other new energy power generation, and adapts to the energy strategic needs of vigorously promoting clean energy transformation. Lay the groundwork for solving the mismatch between energy supply and electricity demand. [...
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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 刘崇茹郭琦刘昊宇罗超王宇王洁聪侯延琦
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)