Voltage regulation method for active distribution network based on coordination of transformer taps and multi-inverters
A multi-inverter, voltage regulation technology, applied in the direction of AC network voltage regulation, electrical components, circuit devices, etc., can solve the problems of abandoned light, serious, not considering multi-inverter coordinated control, etc., to achieve voltage stability, The effect of improving operating efficiency and improving utilization efficiency
Active Publication Date: 2021-06-18
HUNAN UNIV
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Problems solved by technology
[0008] However, this method can only be adjusted for photovoltaic grid-connected inverters. For distribution networks with multiple feeders, some of which contain small hydropower, it is necessary to adjust the voltage of the taps of the main transformer of the distribution network. Changing the tap position will affect the voltage situation of other feeders, so a coordination method is required
In addition, in a feeder line containing photovoltaic grid-connected inverters, the simple Q-V adjustment method does not take into account the coordinated control among multiple inverters, resulting in serious light abandonment.
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[0056] The present invention proposes a voltage regulation method for an active distribution network in which transformer taps and multi-inverters are coordinated, including the following steps:
[0057] Step 1: Measure the voltage at the end of each feeder, V j (j=1,2,…), get the corresponding extremum V max and V min , jump to the next step;
[0058] Step 2: According to figure 2 Given the fuzzy operation logic, calculate the transformer tap output signal f Tap and inverter blocking signal f Lock , jump to the next step;
[0059] Step 3: Transformer tap to read signal f Tap , adjust to the corresponding tap position according to the output logic, and jump to the next step;
[0060] Step 4: Inverter blocking signal f Lock Assigned to each inverter, if the signal value is 0, the inverter maintains the current power factor for power output, jump to step 1 to proceed to the next cycle; if the signal value is 1, then jump to step 5, and proceed The inverter starts the c...
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The invention discloses a method for adjusting the voltage of an active distribution network in which transformer taps and multi-inverters are coordinated. In the distribution network, when the end of the feeder rises / falls at the same time, the present invention can adjust the tap position of the transformer based on the fuzzy control theory to maintain the voltage stability at the end of the feeder, and at the same time maintain the inverter to ensure the output of the unit power factor, which can make the inverter The utilization efficiency of the device is improved. When the voltage variation trends at the ends of different feeder lines are different, and the situation of high voltage at one end and low voltage at the other end occurs, the power distribution optimization module (PAO) in the present invention introduces an optimization module on the basis of the traditional Q-V adjustment curve, and coordinates the feeder The status of the upper photovoltaic power supply ensures that the feeder voltage is maintained within the rated range while ensuring the maximum total photovoltaic output power. While maintaining the voltage stability of the distribution network, the invention can also ensure the output power of the photovoltaic power supply, improve the economic benefits of the owners of new energy power generation, and have good social and economic benefits.
Description
technical field [0001] The invention relates to an active distribution network voltage regulation method in which transformer taps and multi-inverters are coordinated, and is suitable for the voltage stability control of a distribution network containing high-permeability renewable energy and the improvement of the utilization efficiency of renewable energy. Background technique [0002] With the development of renewable energy application technology, the installed capacity of distributed power in the traditional distribution network has increased year by year. Since renewable energy is affected by the external environment, such as light intensity, load and temperature, etc., it is random and intermittent. The mismatch between the output characteristics of distributed power sources and loads will lead to fluctuations in grid voltage. Especially in photovoltaic poverty alleviation areas, due to the long distribution network lines and the large proportion of R / X, the phenomeno...
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IPC IPC(8): H02J3/16H02J3/38
CPCH02J3/383H02J3/16Y02E10/56Y02E40/30
Inventor 刘嘉彦李勇曹一家谭益林刚乔学博
Owner HUNAN UNIV