Controllable phase shifter and control method thereof

Abstract

The invention discloses a controllable phase shifter, which comprises a series transformer, a parallel transformer, a voltage regulating switch and a current limiter, wherein the current limiter is formed by connecting a bypass switch and a reactor in parallel; the current limiter is connected in series in a secondary side branch of the series transformer or connected in series in a secondary sidebranch of the parallel transformer; one of the series transformer secondary side branch, the parallel transformer primary side branch and the parallel transformer secondary side branch is in triangular connection, and the other two are in star connection, wherein the primary side branch of the series transformer is connected in series in a power transmission line, the primary side branch of the parallel transformer is connected with the primary side branch of the series transformer, and the secondary side branch of the series transformer is connected with the secondary side branch of the parallel transformer. The invention further discloses a control method of the controllable phase shifter. By adopting the technical scheme, the power flow of the power grid can be controlled, and the short-circuit current level is suppressed; the power grid transmission capacity, equipment utilization rate and safety are improved.

Description

technical field [0001] The invention belongs to the field of FACTS (Flexible AC Transmission Systems), and in particular relates to a controllable phase shifter and a control method thereof. Background technique [0002] With the development of the economy, the demand for electricity continues to grow, and the scale of the power grid is also expanding. In the process of development, there are also the following problems: due to the influence of the natural distribution of power grid power flow, many regional power grids have uneven distribution of power flow in transmission sections. The problem is that some lines are heavy-loaded and some lines are light-loaded, which affects the transmission capacity of the power grid and the utilization rate of power grid equipment; because the geographical distribution of China's energy centers and load centers is inconsistent, it is necessary to use UHV AC and DC technology to transmit power from the energy center To the load center, th...

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Problems solved by technology

[0002] With the development of the economy, the demand for electricity continues to grow, and the scale of the power grid is also expanding. In the process of development, there are also the following problems: due to the influence of the natural distribution of power grid power flow, many regional power grids have uneven distribution of power flow in transmission sections. The problem is that some lines are heavy-loaded and some lines are light-loaded, which affects the transmission capacity of the power grid and the utilization rate of power grid equipment; because the geographical distribution of China's energy centers and load centers is inconsistent, it is necessary to use UHV AC and DC technology to transmit power from the energy center To the load center, the existence of the multi-voltage level electromagnetic ring network in the load center makes it difficult to control the power flow of the power grid. On the one hand, the power flow of the transmission channel is uneven, and the transmission capacity of the transmission line cannot be exerted. It may be transferred to the lower power grid, leading to the expansion of the scope of the accident; with the development of the power market and the grid connection of new energy power generation, the random characteristics of the power flow of the power grid are becoming more and more obvious, and the power flow of the power grid is difficult to control, which may endanger the safe and stable operation of the power grid; in addition, with the scale of the power grid The expansion of the short-circuit current level is also increasing rapidly, which has approached or exceeded the maximum allowable capacity of the circuit breaker. The heating and electrodynamic effects generated when the short-circuit current passes through the electrical equipment and current-carrying parts may cause serious damage to the electrical equipment. effective means to suppress the short-circuit current level of the system

[0003] Using traditional methods to solve the above problems, or the investment is huge, or the effect is not ideal

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