System and method for controlling electric energy quality stability of power distribution network
A stable control method and power quality technology, applied in AC network load balancing, AC network to reduce harmonics/ripples, harmonic reduction devices, etc. Fluctuation and other problems, to achieve the effect of improving dynamic and steady-state performance, ideal effect, and improving damping characteristics
Inactive Publication Date: 2012-05-23
CHANGCHUN INST OF TECH
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Problems solved by technology
The shortcomings of this device are: firstly, due to the fluctuation of component parameters, the detection results are often greatly affected; secondly, when the PWM inverter performs compensation, the dynamic response speed of the compensation signal is slow and the stability is poor
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[0033] refer to figure 1 , the invention includes an energy storage device, a PWM inverter, a filter and a series transformer, the voltage source is the voltage provided by the power plant, the impedance is the impedance of the line and the system, and the load is the user's electrical equipment. The whole system is equivalent to a dynamic controlled voltage source connected in series in the power distribution system. The output of the voltage source can offset the adverse effects of the power system disturbance on the load voltage, such as voltage sag, voltage unbalance and harmonic wave etc. When the grid output voltage is normal, the energy storage device is charged; when the grid voltage is abnormal, the power provided by the energy storage device is fed back to the grid through the PWM inverter and filter to ensure the normal voltage of the load side.
[0034] The preferred energy storage device of the present invention is a DC bus capacitor shared by the PWM rectifier c...
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The invention discloses a system for controlling electric energy quality stability of an electric energy distribution network. The system comprises an energy storage device, a pulse width modulation (PWM) inverter, a filter and a series injection transformer, and is characterized in that: the detection part of the PWM inverter determines effective values and a phase jump angle alpha of a target voltage function, the target voltage function and a voltage compensation quantity in sequence by a d-q detection method; and the compensation part of the PWM inverter uses double closed-loop control in which current and voltage serve as controlled quantities. By the control method, a fundamental wave voltage quantity can be compensated by a detection algorithm, and different compensation quantities can be calculated according to different compensation strategies. The damping characteristic and the load reference voltage tracking capability under the condition of a variable load of a controller are improved, the dynamic performance and the steady performance of the controller are improved, the system for controlling the electric energy quality stability of the power distribution network is low in cost and small in investment, and an ideal effect can be achieved after the system is used.
Description
technical field [0001] The invention relates to the solution to the problems of the power quality of the distribution network, especially the compensation control system and control method for the voltage drop and harmonic voltage of the network voltage. Background technique [0002] In modern society, electric energy is one of the most widely used energy sources, and its application degree is one of the main symbols of a country's development level. With the rapid development of science and technology and the national economy, the demand for electric energy is increasing day by day, and the requirements for electric energy quality are also getting higher and higher. Due to the frequent occurrence of power quality problems, the annual loss in the United States reaches 13.3 billion US dollars. In my country, although the overall economic and technical level is still relatively backward, the impact of power quality problems in some economically developed areas has become more...
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Login to View More IPC IPC(8): H02J3/28H02J3/01
CPCY02E40/40
Inventor 孟祥萍王瑾
Owner CHANGCHUN INST OF TECH