A Fault Analysis Method for Distributed Power Supply Connected to Distribution Network
A technology of distributed power supply and fault analysis, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as inapplicability and large errors, and achieve the effect of improving accuracy and strong practicability
Active Publication Date: 2016-01-20
STATE GRID CORP OF CHINA +2
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Problems solved by technology
The traditional fault analysis is mainly concerned with the performance of the I-stage protection after the fault occurs, but for the distribution network, it is not applicable to use the traditional voltage source equivalent model to calculate the long-term transient process for the rotating motor type distributed power supply.
Therefore, the existing fault analysis methods will inevitably produce large errors
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[0045] Such as figure 2 As shown in Fig. S and Z S are the voltage and impedance equivalent parameters of the system power supply, respectively. The bus voltage transformer PT at the outlet of the feeder can measure the voltage. The black rectangle in the line represents the switch and has the function of current measurement; the white rectangle in the line is the equivalent impedance of the line. The symbol S with different subscripts indicates the load at different locations. The numerical values in the examples have been converted into per unit values.
[0046] (1) Collect system power supply voltage and current parameters, line impedance parameters, line current parameters, rotating motor type distributed power supply parameters and uploaded power, inverter distributed power supply parameters and uploaded power;
[0047] (2) Using the KVL equation and the recursive method, calculate the voltage and equivalent load impedance of each node of the distribution network ...
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The invention relates to a method for fault analysis of a power system, in particular to a method for fault analysis of a distributed type power source connected power distribution network. The method comprises the following steps that (1) data of the distributed type power source connected power distribution network are collected; (2) voltage, current and equivalent load resistance of each node of a power distribution network feeder line are determined; (3) fault analysis is respectively conducted on a rotary motor type distributed power source and an inverter type distributed power source; (4) the voltage and the current of each node of the power distribution network feeder line are determined; (5) whether a limit value is met or not is judged and if the limit value is met, the fault analysis process is finished; if the limit value is not met, an iteration value is selected to serve as a mean value of a calculation value and the limit value, and the step (4) is repeated. According to the method, fault transient characteristics and a control strategy of a typical distributed power source are combined, the requirements for connection of the power source to the power distribution network are considered, and therefore the accuracy of fault analysis is improved.
Description
technical field [0001] The invention relates to a fault analysis method of a power system, in particular to a fault analysis method for a distributed power source connected to a distribution network. Background technique [0002] The traditional distribution network power supply is single and the structure is simple. The existing symmetrical fault analysis method is to use the voltage source model or the current source model to equalize the system power supply and then solve the node voltage and branch current in the network. A large number of distributed power sources are connected to the distribution network, and the structure of the distribution network has undergone great changes. At the same time, because the transient output characteristics of the inverter-type distributed power supply are completely different from those of the traditional rotating motor-type power supply, they are greatly affected by the control strategy. The control strategy of the inverter distribut...
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IPC IPC(8): G01R31/00
Inventor 李伟杨国生王兴国杜丁香李仲青王晓阳周泽昕
Owner STATE GRID CORP OF CHINA