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This paper describles a multipleloop voltage instantaneous feedback inverting power supply based on digital PID control arithmetic.

介绍一种基于数字 PID控制算法的电压瞬时值反馈逆变电源，分析了其控制算法及控制框图，仿真表明该系统具有良好的输出响应特性。

The instantaneous voltage PID control inverter has advantage on circuit and cost, compared with voltage current dual-loop control inverter.

逆变器瞬时电压PID控制与电压电流双环控制相比，在电路结构、成本等方面更具优越性。

Oscilloscopes can observe the instantaneous voltage relative to time, display the shape of waveform and measure such parameters as frequency and phase.

示波器、信号源在当今仪器中是最通用的电子仪器，示波器可观察相对于时间的瞬时电压，它可显示波形的形状并可测量频率和相位等参数。

In order to realize this function, the instantaneous values of the three-phase voltage and current are converted to the d-q coordinates in the ACR block of the terminal controller so as to suppress interaction between the active and reactive components, as shown in Fig.

为了实现这一功能，三相电压电流的瞬时值被转换到终端控制器ACR的d-q坐标系，使得抑制交直流成分之间的相互作用，如图二所示

Development of the instantaneous voltage drop compensator.

瞬间电压降补偿器的研制

The design method of PID controller based on pole-assignment is proposed in this paper. The simulations indicate that this PID controlled inverter provides nice characteristics. A method of PI controller combined with instantaneous differential voltage is also proposed, which is equivalent to PID control in essence and can be seen as a simplified dual-loop form. Accordingly it is a simple but effective adjustment.

本文研究了基于极点配置的PID控制器的设计方法，仿真结果显示这种PID控制器性能优越，同时还提出一种PI调节器结合电压微分反馈的调节方式，并指出这种调节方式和PID调节其实是等效的，而且是一种简化的双环形式，因此是一种简单而有效的调节方式。

Then, the instantaneous voltage feedback control circuit of the Z source inverter with an inner loop of the output filter inductor current is designed. The validity of the double close loop control strategy is verified by simulation and experiment results.

首先对阻抗源逆变器的逆变部分进行了建模，其次简要介绍了传统电压源型逆变器的控制策略，然后以带滤波电感电流内环的电压瞬时值反馈控制为例介绍了阻抗源逆变器的输出电压控制的实现。

Twenty sinewaves of different frequencies may be conceptually complex to us, and the output of a symphony orchestra even more so, but to an amplifier both composite signals resolve to a single instantaneous voltage that must be increased in amplitude and presented at low impedance.

二十种不同频率的正弦波可能对我们来说概念上有点复杂，交响乐团的输出会更多，但是对于一个功放来说，混合信号会分解到瞬间电压（瞬间电压必须在振幅中增加，并且在低抗阻中显示。

The adaptive current and voltage instantaneous trip protective relays overcome the shortcomings of the conventional ones, such as their unchangeable settings and their protect range depending on system operating conditions and the type of fault.

自适应电流、电压综合速断保护克服了传统的单独的电流保护和电压保护一成不变的定值、保护范围受系统运行方式和短路类型的影响等缺点，可使保护范围始终保持在最优的状态。

Based on the needs of system control strategy and the output of the active inverter, a switch function method was adopted to build the average model of switch cycle for the active inverter in order to accurately analyze operation characteristic of active inverter, a feed forward and double loop control strategy is put forward, its double control includes a inductor current inner loop control and instantaneous voltage outer loop control.

中文摘要：为准确分析有源逆变器的运行特点，根据系统控制策略的需要，在考虑了有源逆变器输出的基础上采用开关函数法建立了有源逆变器的开关周期平均模型。提出一种前馈加双环控制的控制策略，它的双环控制包括一个电感电流内环控制和一个瞬时电压外环控制。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。