Variable-frequency power transmission and distribution system
A technology for power transmission and distribution and receiving end systems, which is applied in the direction of conversion equipment that can be converted to DC without intermediate conversion, and can solve problems such as the efficiency and operational performance deterioration of constant frequency power transmission and distribution systems
Inactive Publication Date: 2012-08-15
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
Even so, the efficiency and operational performance of constant frequency transmission and distribution systems can still deteriorate as line load levels vary
Method used
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[0018] The present invention will be described in further detail below in conjunction with accompanying drawings and examples.
[0019] Such as figure 1 As shown, the frequency conversion power transmission and distribution system is composed of the frequency conversion transformer 1 at the sending end, the transmission line 2, and the frequency conversion transformer 3 at the receiving end, and is used to connect the sending end system 4 and the receiving end system 5 .
[0020] When the load of the transmission line changes, the frequency conversion transformer 1 at the sending end converts the frequency f1 and voltage U1 of the electric energy from the sending end system 4 into electric energy with a frequency f2 and a voltage U2 according to the optimized calculation results, and transmits it to the receiving end through the transmission line 2 The variable frequency transformer 3 converts the received electric energy into the frequency f3 and voltage U3 required by the re...
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The invention discloses a variable-frequency power transmission and distribution system. The system comprises a sending end variable-frequency transformer and a receiving end variable-frequency transformer connected through a power transmission line, wherein the sending end variable-frequency transformer is connected with a sending end system, and the receiving end variable-frequency transformer is connected with a receiving end system; when the load of the power transmission line changes, the sending end variable-frequency transformer converts frequency and voltage of electric energy from the sending end system into optimized frequency and voltage which are transmitted to the receiving end variable-frequency transformer through the power transmission line; and the receiving end variable-frequency transformer converts the frequency and voltage of the received electric energy into frequency and voltage required by the receiving end system, and the converted frequency and voltage are transmitted to the receiving end system. The variable-frequency power transmission and distribution system can realize the conventional power transmission and distribution (such as power-frequency alternating current power transmission and distribution and direct current power transmission and distribution); working frequency of the sending end system connected with the variable-frequency power transmission and distribution system is variable, and working frequency of the receiving end system connected with the variable-frequency power transmission and distribution system is also variable; and when transmitted power changes, power transmission frequency is changed according to an optimization requirement so as to increase the operation efficiency of the system or improve operation performance.
Description
technical field [0001] The present invention relates to the energy transmission technology in the field of electric engineering, more precisely to a power transmission and distribution technology used in power systems. Background technique [0002] There are two basic power transmission and distribution technologies in the current power system, namely power frequency (50 Hz or 60 Hz) AC power transmission and distribution and DC power transmission and distribution, among which power frequency AC power transmission and distribution technology is the most widely used. Although DC transmission has many advantages, due to the difficulty in manufacturing high-voltage and large-capacity DC switches, it is difficult to realize multi-terminal transmission. Therefore, DC transmission is currently mainly used for point-to-point transmission and is an important supplement for power frequency AC transmission and distribution. [0003] Since the 1990s, some scholars have proposed the ide...
Claims
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IPC IPC(8): H02M5/10
Inventor 王丹毛承雄陆继明娄慧波
Owner HUAZHONG UNIV OF SCI & TECH